NUREG/CR-6144 BNL-NUREG-52399 Vol. 2, Part 3A

Evaluation of Potential Severe Accidents During Low Power and Shutdown Operations at Surry, Unit 1

Analysis of Core Damage Frequency from Internal Events During Mid-Loop Operations Appendix E (Sections E.1-E.8)

Manuscript Completed: January 1994 Date Published: June 1994

Prepared by T. L. Chu, Z. Musicki, P. Kohut, D. Bley1, J. Yang, B. Holmes2, G. Bozoki, C. J. Hsu, D. J. Diamond, D. Johnson1, J. Lin1, R. F. Sua, V. Dang3, D. Ilberg4, S. M. Wong, N. Siu3

Brookhaven National Laboratory Upton, NY 11973

Prepared for Division of Safety Issue Resolution Office of Nuclear Regulatory Research U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 NRC FIN L1922

1PLG Inc., 4590 MacArthur Boulevard, Newport Beach, CA 92660-2027 1 $ A 0 T IT 2AEA Technology, Winfrith, Dorchester, Dorset, England, DT2 8DH |^| jf^, J | £ 3MTT, Cambridge, MA 02139 (N. Siu currently at EG&G, Idaho Falls, ID 83415) 4Soreq Nuclear Research Center, Yavne 70600, Israel

DISTRIBUTION OF Trl.e -OCUMflMT » UNUMfTED DISCLAIMER

This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. DISCLAIMER

Portions of this document may be illegible in electronic image products. Images are produced from the best available original document. ABSTRACT

Traditionally, probabilistic risk assessments (PRA) of severe accidents in nuclear power plants have considered initiating events potentially occurring only during full power operation. Some previous screening analyses that were performed for other modes of operation suggested that risks during those modes were small relative to full power operation. However, more recent studies and operational experience have implied that accidents during low power and shutdown could be significant contributors to risk.

During 1989, the Nuclear Regulatory Commission (NRC) initiated an extensive program to carefully examine the potential risks during low power and shutdown operations. The program includes two parallel projects beingperformed by Brookhaven National Laboratory (BNL) and Sandia NationalLaboratories (SNL). Two plants, Surry (pressurized water reactor) and Grand Gulf (boiling water reactor), were selected as the plants to be studied.

The objectives of the program are to assess the risks of severe accidents initiated during plant operational states other than full power operation and to compare the estimated core damage frequencies, important accident sequences and other qualitative and quantitative results with those accidents initiated during full power operation as assessed in NUREG-1150. The scope of the program includes that of a level-3 PRA.

The objective of this volume of the report is to document the approach utilized in the level-1 internal events PRA for the Surry plant, and discuss the results obtained. A phased approach was used in the level-1 program. In phase 1, which was completed in Fall 1991, a coarse screening analysis examining accidents initiated by internal events (including internal fire and flood) was performed for all plant operational states (POSs). The objective of the phase 1 study was to identify potential vulnerable plant configurations, to characterize (on a high, medium, or low basis) the potential core damage accident scenarios, and to provide a foundation for a detailed phase 2 analysis.

In phase 2, mid-loop operation was selected as the plant configuration to be analyzed based on the results of the phase 1 study. The objective of the phase 2 study is to perform a detailed analysis of the potential accident scenarios that may occur during mid-loop operation, and compare the results with those of NUREG-1150. The scope of the level-1 study includes plant damage state analysis, and uncertainty analysis. Volume 1 summarizes the results of the study. Internal events analysis is documented in Volume 2. It also contains an appendix that documents the part of the phase 1 study that has to do with POSs other than mid- loop operation. Internal fire and internal flood analyses are documented in Volumes 3 and 4. A separate study on seismic analysis, documented in Volume 5, was performed for the NRC by Future Resources Associates, Inc. Volume 6 documents the accident progression, source terms, and consequences analysis.

In the phase 2 study, system models applicable for shutdown conditions were developed and supporting thermal hydraulic analysis were performed to determine both the timing of the accidents and success criteria for systems. Initiating events that may occur during mid-loop operations were identified and accident sequence event trees were developed and quantified. In the preliminary quantification of the mid- loop accident sequences, it was found that the decay heat at which the accident initiating event occurs is an important parameter that determines both the success criteria for the mitigating functions and the time available for operator actions. In order to better account for the decay heat, a "time window" approach was

iii NUREG-CR/6144 developed. In this approach, time windows after shutdown were defined based on the success criteria established for the various methods that can be used to mitigate the accident. Within each time window, the decay heat and accident sequence timing are more accurately defined and new event trees developed and quantified accordingly. Statistical analysis of the past outage data was performed to determine the time at which a mid-loop condition is reached, and the duration of the mid-loop operation. Past outage data were used to determine the probability that an accident initiating event occurs in each of the time windows. This probability is used in the quantification of the accident sequences.

The mean core damage frequency of the Surry plant due to internal events that may take place during mid-loop operations is 5E-06 per year, and the 5th and 95th percentiles are 5E-07 and 2E-05 per year, respectively. This can be compared with the mean core damage frequency from internal events of 4E-05 per year estimated in the NUREG-1150 study for full power operations.

NUREG/CR-6144 iv Contents

Appendix E Event Trees and Their Associated High Level Fault Trees

NUREG/CR-6144

m* W] ^

FOREWORD

(NUREG/CR-6143 and 6144) Low Power and Shutdown Probabilistic Risk Assessment Program

Traditionally, probabilistic risk assessments (PRA) of severe accidents in nuclear power plants have considered initiating events potentially occurring only during full power operation. Some previous screening analysis that were performed for other modes of operation suggested that risks during those modes were small relative to full power operation. However, more recent studies and operational experience have implied that accidents during low power and shutdown could be significant contributors to risk.

During 1989, the Nuclear Regulatory Commission (NRC) initiated an extensive program to carefully examine the potential risks during low power and shutdown operations. The program includes two parallel projects performed by Brookhaven National Laboratory(BNL) and Sandia National Laboratories(SNL), with the seismic analysis performed by Future Resources Associates. Two plants, Surry (pressurized water reactor) and Grand Gulf (boiling water reactor), were selected as the plants to be studied.

The objectives of the program are to assess the risks of severe accidents due to internal events, internal fires, internal floods, and seismic events initiated during plant operational states other than full power operation and to compare the estimated core damage frequencies, important accident sequences and other qualitative and quantitativeresults with those accidents initiatedduring full power operation as assessed in NUREG-1150. The scope of the program includes that of a level-3 PRA.

The results of the program are documented in two reports, NUREG/CR-6143 and 6144. The reports are organized as follows:

For Grand Gulf:

NUREG/CR-6143 Evaluation of Potential Severe Accidents during Low Power and Shutdown Operations at Grand Gulf, Unit 1

Volume 1: Summary of Results Volume 2: Analysis of Core Damage Frequency from Internal Events for Operational State 5 During a Refueling Outage Part 1: Main Report Part 1A: Sections 1 - 9 Part IB: Section 10 Part 1C: Sections 11 - 14 Part 2: Internal Events Appendices A to H Part 3: Internal Events Appendices I and J Part 4: Internal Events Appendices K to M Volume 3: Analysis of Core Damage Frequency from Internal Fire Events for Plant Operational State 5 During a Refueling Outage Volume 4: Analysis of Core Damage Frequency from Internal Flooding Events for Plant Operational State 5 During a Refueling Outage Volume 5: Analysis of Core Damage Frequency from Seismic Events for Plant Operational State 5 During a Refueling Outage

vii NUREG/CR-6144 Foreword (continued)

Volume 6: Evaluation of Severe Accident Risks for Plant Operational State 5 During a Refueling Outage Part 1: Main Report Part 2: Supporting MELCOR Calculations

For Surry:

NUREG/CR-6144- Evaluation of Potential Severe Accidents during Low Power and Shutdown Operations at Surry Unit-1

Volume 1: Summary of Results

Volume 2: Analysis of Core Damage Frequency from Internal Events during Mid-loop Operations Part 1: Main Report Part 1A: Chapters 1 - 6 Part IB: Chapters 7 - 12 Part 2: Internal Events Appendices A to D Part 3: Internal Events Appendix E Part3A Sections E.l - E.8 Part 3B: Sections E.9 - E.16

Part 4: Internal Events Appendices F to H Part 5: Internal Events Appendix I Volume 3: Analysis of Core Damage Frequency from Internal Fires during Mid-loop Operations Part 1: Main Report Part 2: Appendices Volume 4: Analysis of Core Damage Frequency from Internal Floods during Mid-loop Operations Volume 5: Analysis of Core Damage Frequency from Seismic Events during Mid-loop Operations Volume 6: Evaluation of Severe Accident Risks during Mid-loop Operations Part 1: Main Report Part 2: Appendices

NUREG/CR-6144 viii APPENDIX E

EVENT TREES AND THEIR ASSOCIATED HIGH LEVEL

FAULT TREES

E-l

im^mmm^m^^' vz^m^im-i-m APPENDIX E

EVENT TREES AND THEIR ASSOCIATED HIGH LEVEL

FAULT TREES

Page

E.l Event Trees and High Level Fault Trees for Over Draining

to Mid-loop (RHR2A) E-3

E.2 Event Trees and High Level Fault Trees for Loss of Inventory (RHR2B) E-60

E.3 Event Trees and High Level Fault Trees for Non-Recoverable Loss of RHR (RHR3) , E-117 E.4 Event Trees and High Level Fault Trees for Loss of Operation Train of RHR (RHR4) E-166

E.5 Event Trees and High Level Fault Trees for Recoverable Loss of RHR (RHR5) E-219

E.6 Event Trees and High Level Fault Trees for Loss of Offsite Power (LI) E-272

E.7 Event Trees and High Level Fault Trees for Loss of Offsite Power (L2) E-368

E.8 Event Trees and High Level Fault Trees for Unit 1 Blackout (L3) E-453

E.9 Event Trees and High Level Fault Trees for Two Unit Blackout (Bl) E-537

E.10 Event Trees and High Level Fault Trees for Two Unit Blackout (B2) E-592

E.ll Event Trees and High Level Fault Trees for Loss of 4KV Bus (4K) E-618

E.12 Event Trees and High Level Fault Trees for Loss of Vital Bus (VB) E-701

E.I3 Event Trees and High Level Fault Trees for Spurious Safety Injection Signal (SI) E-784 E.14 Event Trees and High Level Fault Trees for Loss of Component Cooling Water (AR) E-867

E.15 Event Trees and High Level Fault Trees for Loss of Instrument Air (CO E-910

E.16 Event Trees and High Level Fault Trees for Loss of Switchgear Room Cooling (SR) E-967

E-2 Appendix E.1 Event Trees and High Level Fault trees for Over Draining to Mid- Ioop(RHR2A)

E-3

•>v&,,;ss. r,- ..•' . .1 a;CT?^»>-^m UNITY IRAWl MRAWl RRAWl VWl SRAWl FRAWI GRAW1 CRAWl SEQ # END-STA TE-

1 OK 2 OK 3 OK 4 CD 5 CD 6 CD 7 OK 8 OK 9 CD 10 CD 11 OK 12 CD 13 CD 14 CD 15 OK 16 OK 17 CD 18 CD

RAW1R6 Event Tree UNITY IRAWl MRAWl RRAWl FRAWIV CRAWIV SEQ g END-STATE-NAMES

OK OK OK CD CD m OK I CD '-/I CD

RAW1D6 Event Tree Top Event for Loss of Instrument Air in Window 1

£ Frequency ColcuVsticn for ARWI

Frequency of 039 of Instrument Air a PRE3-AIR

IT

[Xrolton of Frequency of POS ID of o ProbobfCty Probability X) of Refueling Refueling Refueling Oulog* of POS W Given thai E occurs Ouloge Retue6ng Outoge In wl given RK> U U

DURATION-RH) FRAC-POSW PR08-WHX)

POfe 6 of o Refueling Proooblfity Duration of Frequency of C •olned MoVitonenee Ourotlon of Probobiiity P(»S 6 of o Groined Outage thot E occurs P|0S 6 of Refueling Refueling . 6 of Orolned thot E occurs y ointenonce Outoge In wt given R6 Ouloge iterance Outoge in wl given 06

0CRATJ0N-R6 DLRATJ0N-D6 RCS Makeup in Window

RCS Makeup in RHR2A in Window 1

MRAW1

Foilure to Diagnose Foilure to Makeup Over Draining Given Over Droining in Window 1 in Window 1

MRA V1G1

D-RAW1-XHE A-RAW1-XHE-M-12

FAL HIGH PRES INSUF FLOW FRM FAL HIGH PRES INSUF FLOW FRM FLOW TO HOT LEG-: 2 LOW PRES SI FLOW TO CLD LEG-3 2 LOW PRES SI CHRG PMP MANUAL PMPS TO HOT LEGS CHRG PMP MANUAL PMPS TO COLD LEGS

D2HLG LPIHLG D6-C Restore RHR given RHR2B in Window

Restore RHR Given RHR2B in Window 1

00

RR/.W1

Failure to Restore Foilire to Dioqnose Loss of RHR RHR, given RHRB Over Draining Event POSs 3-13 in Window 1 in Window 1

W3-S A-RAW1-XHE-R-4 D-RAW1-XHE Safety Valves Not Removed in Window 1

Safely VoK/es Not Removed in Window 1

VII

POS 6 of o Droined Maintenance Outage

VW1C4 P0S-R6

Pressurizer Safety Volves Removed In W1R6

PZR-SV-REMOVEOWl Reflux Cooling in Window 1

Redux Cooling Given o RHR2A in Window 1

Foihjre lo Diogpose RCS Loops Isoloted Over Droining Event to Cause Failure in Window t of Reflux Cooling

SRA' «G1 SRAV1Gc2 r ^siso-w:i D-RAW1-XHE

,_ INSUF aow TO Oporator Failure 1 SG FRM AT LEAST to Feed SGs In I AFW PUMP Window 1-RHR2A ZJ LSWI SRAV1G3 SRAV

A-RAW1-XHE-SF-9

Operator Failure FALURE OF FAL TO aOSE FALURE OF Operator foilure to Bleed the SECONDARY SIDE BOTH PORVS SECONDARY SIOE to cstoblish SGs 1 given RHR2A HEAT REMOVAL HEAT REMOVAL reflux after PRT rupture

SSHW1 PORV1 SSHW1

A-RAW1-XHE-S1-9 A-RAVfl-XHE-SS-9 RCS Loops Isolated to Cause Failure of Reflux in Window 1

m

P0S-D6

Secondary Side of SGs Ooined in POSs 6 of Orotned Moinfenon

L00PISaAfE0O6 SGS-ORAINED-CSO SGS-DRANED-R IOOPISCLATES1R10 LOCPISOATED1R6 SCS-ORAINEO-R Feed and Bleed the RCS in RHR2A, Window 1

Feed ond Bleed the RCS in RHR2A uWindow I

Feed and Bleed Solely Vote the RCS in RHR2A Removed in Window Window 1 I

FRAW1G1 SV-W1 m i Foiture to Diagnose Over Droning Event fn Window 1

FRAV1G2

0-RAWI-XHE

FRAV X4

1 FALURE OF FEED Operator Failure AND SPLL USING to use HHSI in HPI food ond spill in Window I

FSW12L FSWI2H

A-RAWl-XHE-a-5 A-RAWI-XHE-FH-5 Safety Valves Removed in Window

Safety Valve Removed in Window 1

SV W1

POS 10 of o POS 6 of a Drained Refueling Outage Maintenance Outage

sv- V1G0 POS -R10 POS-D6

POS 6 of a Refuelinc Pressurizer Outage Safety Valves Removed in W1R6

P0SrR6 PZR-SV-REM0VEDW1 Feed and Bleed the RCS with V failed in RHR2A, Window 1

Feed and Bleed the RCS in RHR2A Window 1

Failure to Diognose Over Droining Event m in Window 1 •fc.

FRAVM51

D-RAW1-XHE

FRAV WG2 FRAV WG4

Operator Failure FALURE OF FEED Operator failure FAILURE OF FEED to use HHSI in AND SPLL USING to use LHSI in ANO SPILL USING feed and spill • rPI Feed and Spill. LPI in Window 1 in Window 1

FSW12H FSW12L A-RAW1-XHE-FH-10 A-RAW1-XHE-FL-10 Gravity from RWST in RHR2A, Window 1

Gravity from RWST in RHR2A Window 1 m i n t— GR/.W1 1st

Safety Valve Removed in Window 1

GRAW1G1 SV-W1

Failure toI Diagnose Operotor Failure INSUF FLOW Over Draining Event to estoblish THROUGH LOW HEAD in Window t gravity feed INJECTION FLOW in window 1 PATH

D6-CG

D-RAW1-XHE A-RAW1-XHE-G-6 Failure of High Pressure Recirculation in Window 1

_. Foilif.ol.Hloh FVMAJ* RaeVcuoi

CRJW1

HPR ZI

Fee d and S'"eam LPR SI *vL„, ctvw riftP SUCT U ( ) A OM 7101 \ ^/ PRAVi A-RiVfi-iaa-c-i

Foibft to DfoaftiM _L COM of Pw* tv»nl Tn Wrejjw 1 LCM of PHS tvtnt ent Exists a a J& to Wn*w t ! D-ftllTt-XHB A-HMti-iin-n-i JL-ttJLWi-XBI-O-t o

EPK to Bet l»j Failure of Recirculation Spray in Window 1-cause HPR failure

Failure of Recirculation Spray in Window

nPR/.W1

loss of HPSH du i to open containment

PRAV1G1

CON-VFC-RP-COREM

Operator Failure Failure to Diagnose to Establish Over Draining Event Recirculation in Window 1 Spray in W1

PRAV »1G2

A-RAW1-XHE-P-4 D-RAW1-XHE

rALURE OF OUTSIDE FALURE OF INSIDE SPRAY RECIRCULATION SPRAY RECIRCULATION

F2LPSD F1.PSD PD

a5S-<

4 d 53 <|l *i S3 3 Si

5?

9 o! If 3! IT 1a o sOr

12-18 UNITY IRAW2 MRAWS RRAW2 VW2 SRAW2 FRAW2 GRAW2 CRAW2 SEQ a END-STA TE-

1 a I OK 2 OK 3 OK 4 CD 5 CD 6 CD rn 7 OK 8 OK 9 CD 10 CD 11 OK 12 CD 13 CD 14 CD 15 OK 16 OK 17 CD 18 CD

RAW2R6 Event Tree UNITY IRAW2 MRAWa RRAW2 SRAW2 FRAW2V CRAW2V SEQ H END-STATE-NAMES

1 OK 2 OK 3 OK 4 OK 5 CD m 6 CD 7 OK © 8 OK 9 CD 10 CD

RAW2D6 Event Tree Top Event for Over Draining Window 2

E Frequency Cofcutotta lor RAW2 T\

IB*|wi

Frwjuoney of LOM of WfM dinng Mdbop cr n

ftttfMNy Of POS « of o ProboMly Probab'Ity Refutinxg Refuting Outoge o( POS 10 Given that C occirs Refuting Outoge in W2 given RIO U U

< S 6 of o Refuting Probot.lt/ Frequency of I roined MoWontnca Probcbilly P)S 6 of o Craned Outage (hat E occt/l Refue* ng Ihol E OCCir* I bTntenonce Ouloge in W2 V"> R6 In W2 given 06

moe-wtRM fBOP-w2D0A RCS Makeup in Window 2

RCS Makeup in RHR2A in Window 2

MRAW2

Foilure to Diagnose Failure to Makeup Over Draining Event Given Over Draining in Window 2 in Window 2

D-RAW2-XHE A-RAW2-XHE-M-12

FAIL HIGH PRES INSUF FLOW FRM FAIL HIGH PRES INSUF FLOW FRM FLOW TO CLD LEG-3 2 LOW PRES SI FLOW TO HOT LEG-. 2 LOW PRES SI CHRG PMP MANUAL PMPS TO COLD CHRG PMP MANUAL PMPS TO HOT LEGS LEGS

02 D6-C D2HLG LPIHLG Restore RHR given RHR2A in Window 2

'----V Restore RHR Given RHR2A in Ifc' Window 2 0 1 RR/W2 Failure to Restore Foilure to Diagnose RHR, given RHR2A Over Draining Event in Window 2 in Window 2 ''a o o A-RAW2-XHE-R-4 D-RAW2-XHE Safety Valves Not Removed in Window 2

Safety Votves Not Removed in Window 2

30S 6 of o Droined Maintenance Outage m • to

VWJG4 P0S-R6

Pressurizer Safety Valves Removed in W2R6

PZR-SV-REM0VEDW2 Reflux Cooling in Window 2

Reflux Cooling Given a RHR2A in Window 2

Failure to Diagnose RCS Loops Isolated Over Draining Event to Couso Foiluro in Window 2 ol Redux Cooling

SRAV2GI IS0-W2

0-RAW2-XHE

INSUF FLOW TO Operator Foikre SG FRM AT LEAST to Feed SGs in I AFW PUW Window 2-RHR2A

SRAW2G4

A-RAW2-XHE-SF-9 1 Operator Failure FALLRE OF SGS FAL TO CLOSE FALURE OF SGS Operator lailure to Bleed the STEAM PATH TO BOTH PORVS STEAM PATH TO to establish SGs In Window WIN STEAM HEADER WIN STEAM HEADER reflux alter PRT rupture

SSHW23 PORV1 SSHW2J

. A-RAW2-XHE-S1-9 A-RAW2-XHE-S2-9 RCS Loops Isolated to Cause Failure of Reflux in Window 2

m

LOOPIS0UTED2D8 SGS-DRMNED-CSO SGS-t«U£D-R lOOPISOUTZlizRIO LO0PIS0UTBD2R8 SOS-CRANED-R Feed and Bleed the RCS in RHR2A, Window 2

Feed ond Bleed the RCS in RHR2A Window 2

FRJW2

Feed ond Bleed Sofety VoKie the RCS in RW12A Removed in Window Window 2 2

m FRAW2G1 SV-W2 i M -J

Fotlure to Dbgnose Over Draining Event in window 2 IT FRAV '202

D-RAW2-XI*

FRAN '203

1 ... ( FALURE OF FEED Operator Foiluro AND SPLL USING to use HHSI In Wl feed and spill A in Window 2 FSW12H () FSW12L A-RAW2-XHE-FH-5 A-RAW2-XHE-FL-5 Safety Valves Removed in Window 2

Sofety Valve Removed in Window 2

rn SV W2 oo POS 10 of o POS 6 of a Drained Refueling Outage Maintenance Outage

SV-W2G0 POS -R10 P0S-D6

Pressurizer Safety Valves Removed in W2R6

P0S-R6 PZR-SV-REM0VEDW2 Feed and Bleed the RCS with V failed in RHR2A, Window 2

Feed and Bleed the RCS in RHR2A Window 2

Foilure to Diagnose Over Draining Event in Window 2

m FRAW2VG1 D-RAW2-XHE

FRAW >VG2 FRAW 2VG3

FALURE OF FEED Operator Foilure Operator foilure FALURE OF FEED AND SPLL USING to use HHSI in to use LHSI in AND SPLL USING HPI feed and spill Feed and Spill LPI in _Window 2 in Window 2 \.

FSW12H FSW12L A-RAW2-XHE-FH-10 A-RAW2-XHE-FL-10 Gravity from RWST in RHR2A, Window 2

Gravity from RWST in RHR2A Window 2 m n GR/W2 i o Safety Valve Removed in Window 2

CRAV2GI SV-W2

Operotor Failure INSUF ROW Failure to Diagnose to Establish THROUGH LOW HEAD Over Draining Event Gravity Feed INJECTION FLOW in Window 2 in Window 2 PATH

D6-CG

A-RAW2-XHE-G-6 C-RAW2-XHE Failure of High Pressure Recirculation in Window 2

roihrio! Koh Ft-MKT« fttcYcilwen In Wiu*» 2

cn|ira 1 1 | fltfttr Vklri* 3 ^Tte &W ST HPR KAmartd Oi A Q CM, raoa 8V-W2 aa raca

1 1 1 i 1 •dV« ot RsdrcuWJo I | Op*fotor Feito* m LPR Lou of.Wfl EV*n* Bprty (n Wn*w "irate?" VHMlff ta crott Comorf LPR In win** 2 THE RKR UCte H>l (F& teanr ) OWN PWP SICT F&STDill A A A r ^ ( \ A 0Ra4 !M 1 o PM.V« HI to FSWIJM CM nci A-JUHe-OOII-0^4 tt-tXVi~X01 A-UTra-XHB-3 1 1 1 i i 1 Sdtty Vduaa *aV< of RtdraArtfo i At Hcrao* in f^rcy h wndov V«n* XxliU w!nl5« 2 Hn Wn** 2 GMra «rpr%r itpui with In Win*« 2 A A ("1 n A f ^ r ^ VW2 n PKAVI o\ / rauioao CM18CJ PDAWItl \£im.tt Q-UV3-XMC i.-SJkH2-XBI-0-4 A-SLOtt-123-0-4 D-JUWa-XHB

. 1 _ i 1 LPR to If ft to LCS RECR ICC Bat L«| A A A A Failure of Recirculation Spray in Window 2-cause HPR failure

Fpilure of Recirculotion Spray in Window 2

PR/W2

loss of HPSH du i to open containment

m PRAV2G1 to CON-VFC-RP-COREM

Failure to Diagnose Operator Failure Over Draining Event to Estoblish in Window 2 Recirculation •Sproy in W2

nPRAU 2G2 0-RAW2-XHE A-RAW3-XHE-P-4

"ALURE OF OUTSDE FALURE OF INSIDE SPRAY RECIRCULATION SPRAY RECIRCULATION

F2LPSD FLPSD Failure of High Pressure Recirculation in Window 2

. ra&raotHp Pmw JlicVeuirooft r In Wm)j» 2 n

Cfcyrar

HPR X-Tie RWSTs 7J rr

Foliri Opjfotof FoiVjf* m Lou of fw Ev#m . to CTMI Compel JMWiSfJBB LPR in Wlnctow 2 4" cww pyip SUCT DC FECR MCCE WST Own SJooewf* I Co (F&ijjteamh :ooro (F&SpllO if 2 - Q PRAW* N^^y HI ^ TT TT ^ A-iuiTa-xia-c-fl HJ \ / , A-uva-xtm-\ / x FSWISH

LoM of F... _.. Y«nt xxtitt WWOw 2 In Win*. 2 in Wn*w 1 for PMd w»d ~[tin. «ilP|_

ui srot OM mat PBAIUH A-juwa-xjn-o-fl A-BXVa-inH-Q-0 D-axva-iSH

JfHESUBld £11. LCS RECB U3EI B* >*• LCS f£CB kC6 UNITY IRAW3 MRAW3 RRAW3 VW3 FRAW3 GRAW3 SEQ H END-STATE-NAMES

1 OK 2 OK 3 OK 4 CD 5 CD 6 OK 7 CD 8 OK 9 CD 10 CD 11 OK 12 CD

•RAW3R6 Event Tree UNITY 1RAW3 MRAW3 RRAW3 SRAW3 FRAW3V SEQ # END-STATE-NAMES

,ftr. OK OK OK OK CD m OK OK CD

RAW3D6 Event Tree UNITY 1RAW3 MRAW3 RRAW3 VW3 FRAW3 GRAW3 SEQ H END-STATE-NAMES

1 OK 2 OK 3 OK

4m CD I CD OK 7e CD 8 OK 9 CD 10 CD U OK 12 CD

RAW3R10 Event Tree top event for Over Draining in window 3

E Freouericy CoteuViUftn for II lRJk*3

Frequency of Over Groining In window $ U 9 PR0B-RIIB2\ / A IRA »30 n

Frequency 0/ POS » of a ProbobXly PrcbdbiUy Refueling Refueling Outage of POS 10 Given that C ocare Refueling Outoge u In w3 given Rt) U PR0B-W3R10A

POS 6 of o RflfueG g Probobidty Freojuency of Groined Ma'nlonenc< ProboMity POS 6 of 0 Droirie Ouloge that C occurs Refueling that E occurs Mointenonce Oulog< In w3 gton R6 In wi gVen OS

PR0D-W3R0A PR0B-W3D0A RCS Makeup in Window 3

RCS Mokeup in RHR2A in Window 3

MRAW3

Failure to Diagnose Failure to Makeup Over Draining Event Given Over Draining in Window 3 in Window 3

MRA]V3G3 1 D-RAW3-XHE A-RAW3-XHE-M-10

FAL HIGH PRES INSUF FLOW FRM FAL HIGH PRES INSUF FLOW FRM FLOW TO HOT LEG-; 2 LOW PRES SI FLOW TO OLD LEG-; •2 LOW PRES SI CHRG PMP MANUAL PMPS TO HOT LEGS CHRG PMP MANUAL PMPS TO COLD LEGS

D2HLG LPIHLG D6-C Restore RHR given RHR2A in Window 3 m

Restore RHR Given RHR2A in in Window 3 0 1 RR*W3 1 Failure to Restore Failure to Diagnose Loss of RHR RHR, given RHR2A Over Draining Event POSs 3-13 in Window 3 in Window 3 Hi A A o W3-S A-RAW3-XHE-R-4 D-RAW3-XHE 1 Safety Volves Not Removed in Window 3

Safety Volves Not Removed in Window 3

o

VWSG1 P0S-R10

Pressurher Pressurizer Safety Valves Safety Valves Removed in W3R6 Removed in W3R6

P2R-SV-REM0VEDW3 P2R-SV-REM0VEDW3 Reflux Cooling in Window 3

Roflux Cooling Given o RHR2A in Window 3

Failure to Diagnose RCS Loops Isoloted Over Draining Event to Cause Failure in Window 3 of Redux Cooling

D-RAW3-XHE

Operator Fa'lure NSUF ROW TO to Feed SCs in SC FRM AT LEAST Window 3-RHR2A t AfW PUMP

LSW23 A-RAW3-XHE-S-8

Operator failure to establish reflux after PRT rupture

SSHW23 PORV1 SSHW23 A-RAW3-XHE-S1-8 A-RAW3-XHE-S2-8 RCS Loops Isolated to Cause Failure of Reflux in Window 3

RCS Loops Isoloted to Couse Failure of Reflux Cootng

ISO- W3 E-4 2 n n isow JG6 SO* 3CO ISO0W 508

1 1 1 30S 6 of o Ooined NO aCS SIGNAL POS 10 of a 1O S 6 of a Refueling Moinlenonco Outogo OP ER OR AUTO Refueling Outoge Outogo TRAN A

ISOW 5G5 Q ) 0 ISOW JG2 cRK > c R6 ISOW 1G10 o POS- POS-D6 POS- 1 1 1 Secondory Side Loops Isoloted Loops Isoloted Secondory Side Loops Isoloted Secondory Side of SGs Ooined in Window 3 of in of Window of SGs Drained in Window 3 of of SGs Ooinod in POSs 6 of D6 3 of RIO In POSs 6 or R6 in POSs 6 or Droined Mointenon W or Refuetnq 10 or Refuelina

SCS c1E 0- <:s o LOO -DRAI oPIS0LATEO3O6 LO0PISCLATED3R1o 0 SGS-DRANDD-oR LOOPISOLATE03Ro 6 o SGS-DRAINED-R Feed and Bleed the RCS in RHR2A, Window 3

Feed end Bleed the RCS In RHR2A Window 3

Feed and Bleed Safety VoVe Ihe RCS in RHR2A Removed in Window Window 3 3 IT SV-W3 FRAV 3G1

k Failure to Dioqnose Over Draining Event in Window 3

FRAV3G2 D-RAW3-XHE

FRAV 3G3

1 1 FALURE OFIFEED' Operator failure FALURE OF FEED AND SPU USING' to use LHSI in AND SPU. USING LPI Feed and Spitl HPI In Window 3 A () FSW34L FSW34H A-RAW3-XHE-R-4 A-RAW3-XHE-FH-4 Safety Valves Removed in Window

Safety Valve Removed in Window 3

SV-W3

POS 6 of a Drained Maintenance Outage

SV-V3G00 SV-W3G0

P0S-D6

Pressurizer POS 10 of a Pressurizer Safety Valves Refueling Outage Safety Valves Removed in W3R6 Removed in W3R6

P0S-R6 PZR-SV-REMOVEDW3 POS-R10 PZR-SV-REMOVEDW3 Feed and Bleed the RCS with V failed in RHR2A, Window 3

Feed and Bleed the RCS in RHR2A Window 3

Failure to Diagnose Over Droining tvent in Window 3

•W

FRAV3VG1

D-RAW3-XHE

FRAV 3VG2 FRAV 3VG3

I I FALURE OF FEED Operator Failure Operator failure FALURE OF FEED AND SPILL USING to use HHSI in to use LHSI in AND SPILL USING HPI feed and spill Feed aad^Spill LPI in Window 3 in Winddw, 3 A FSW34H o FSW34L A-RAW3-XHE-FH-8 A-RAW3-XHE-FL-8 Gravity from RWST in RHR2A, Window 3

Grovity from RWST in RHR2A in Window 3

I ON GR/W3

Safety Valve Removed in Window 3

GRAW3G1 SV-W3

Failure, to Diagnose Operotor Failure INSUF aow Over Draining Event to establish THROUGH LOW HEAD in Window 3 grovity feed INJECTION FLOW in window 3 PATH

D6-CG D-RAW3-XHE A-RAW3-XHE-G-5 UNITY IRAW4 MRAW4 RRAW4 VW4 SRAW4 FRAW4 GRA^Y4 SEQ H END-STATE-NAMES

>'

1 OK Z OK 3 OK 4 OK 5 CD 6 OK 7 OK 8 CD 9 OK 10 OK 11 CD 18 OK ^ 13 OK 14 CD

RAW4R6 Event Tree UNITY IRAW4 MRAW4 RRAW4 VW4 SRAW4 FRAW4 GRAW4 SBQ » END-STATE-NAMES

1 OK 2 OK 3 OK 4 OK 5 CD 6 OK 7 OK 8 CD 9 OK 10 OK 11 CD 12 OK 13 OK 14 CD

RAW4R10 Event Tree UNITY IRAW4 MRAW4 RRAW4 SRAW4 FRAW4V SEQ # END-STATE-NAMES

1 m

$$

OK OK OK OK CD OK OK ••a CD

RAW4D6 Event Tree top event for over Draining in window 4

IE Frequency Calculation for RAW4

W W4

Probability of Over Droining during Mid-Loop

IRA (4G1 tn PROB-RHREA i o IT IRA 130Z

Frequency of POS 10 of 0 Probability Probability Ftefuetng Refueling Outage of POS 10 Given thot IE occurs Refueling Outage in W4 given RIO

IRAV4C3 1RA1'4G4 REFUEL POS-R10 FRAC-POSIO PR0B-W4R10A —ii-i' T 'OS 6 of o RefueSng Probability Frequency of Drained Mainlonence Probability POS 6 of o Droined Outoge that .E occurs Refueling that E occurs Maintenonce Outoge in W4 given R6 in W4 given 06

P0S-R6 PROB-W4R6A REFUa DR-MT PROB-W4D6A POS-D6 RCS Makeup in Window 4

RCS Makeup in RHR2A in Window 4

MR. iW4

Failure to Diagnose Failure to Makeup Over Draining Event Given Over Draining in Window 4 in Window 4

D-RAW4-XHE A-RAW4-XHE-M-11

FAIL HIGH PRES INSUF FLOW FRM FAL HIGH PRES INSUF FLOW FRM FLOW TO CLD LEG-; 2 LOW PRES SI FLOW TO HOT LEG-4 2 LOW PRES SI CHRG PMP MANUAL PMPS TO COLD CHRG PMP MANUAL PMPS TO HOT LEGS LEGS

D6-C D2HLG LPIHLG Restore RHR given RHR2A in Window 4

Restore RHR Given RHR2A in Window 4

• •

RRJ W4 1 1 Foilure to Restore Foilure to Diagnose Loss of RHR RHR, given RHR2A Over Draining Event POSs 3-13 in window 4 in Window 4 y\ o n W3-S A-RAW4-XHE-R-5 D-RAW4-XHE Safety Valves Not Removed in Window 4

m i

Pressurizer Pres3urizer Safety Volves Safety Volves Removed in W4R6 Removed in W4R6 i. .' •

PZR-SV-REM0VE0W4 PZR-SV-REMOVE0W4 Reflux Cooling in Window 4

A-RAW4-XHB-3I-8 A-RAW4-XHE-S2- RCS Loops Isolated to Cause Failure of Reflux in Window 4

mi

LOOPISCLATED406 SGS-DRAINEO-CSO SGS-DRANED-R L0OPISOUTED1RK) LOOPIS0UTE04R6 SGS-ORAINED-R Feed and Bleed the RCS in RHR2A Window 4

Feed ond Bleed (he RCS in RKR2A nWindow 4

Feed ond Bleed Sofety Vorve the RCS in RHR2A Removed in Window Window 4 4 ZJ m SV-W4

Foilure lo Oioqnose Over Droining Event in Window 4 D

D-RAW4-XHE zy FRA f 404

_L-

FALURE OF FEED Operotor Foilure FALURE OF FEEO AND SPLl USING to we HHSI in ANO SPU. USING LPI feed ond spill HPI in Window 4

FSW34L A-RAW4-XHE-FL-3 A-RAW4-XHE-FH-5 Safety Valves Removed in Window 4

Safety Volve Removed in Window 4

SV- W4

POS 6 of a Drained Maintenance Outage

SV-V4G00 SV-W4G0 POS-D6

Pressurizer POS 10 of a Pressurizer Safety Valves Refueling Outage Safety Valves Removed in W4R6 Removed in W4R6

P0S-R6 PZR-SV-REMOVEDW4 POS-R10 PZR-SV-REMOVEDW4 d and Bleed the RCS with V failed RHR2B, Window 4

Feed and Bleed the RCS in RHR2B in Window 4

Failure to Diognose Over Draining Event in Window 3

FRA 74VG1 D-RAW4-XHE

FRA /4VG2 FRAV4VG4

Operotor Foilure FAILURE OF FEED Operotor foilure FAILURE OF FEED to use HHSI in ANO SPLL USING ot use LHSI in AND SPLL USING feed and spill HPI Feed and/Spill LPI in Winddw '4 in Wind&K 4

FSW34H FSW34L A-RAW4-XHE-FH-8 A-RAW4-XHE-FL-8 Gravity from RWST in RHR2A, Window 4

Gravity from RWST in RHR1A in Window 4 s GRy.W4 Safety Valve Removed in Window 4

GRAV4G1 SV-W4

Operotor Failure INSUF FLOW Failure to Diagnose to establish THROUGH LOW HEAD Over Draining Event gravity feed INJECTION FLOW in Window 4 in window 4 PATH

D6-CG

•A-RAW4-XHE-G-5 D-RAW4-XHE Appendix E.2 Event trees and High Level Fault Trees for Loss of Inventory(RHR2B)

E-60 UNITY IRBWl MRBWl RRBWl VWl SRBWl FRBWl GRBWl CRBWl SEQ H END-STATE

l OK M OK a OK 3 CD • 4 5 CD 6 CD 7 OK 0 OK 9 CD 10 CD 11 OK 12 CD 13 CD 14 CD 15 OK 16 OK 17 CD 18 CD

RBW1R6 Event Tree UNITY IRBW1 MRBW1 RRBWI FRBW1V CRBWlV SEQ H END-STATE-NAMES

OK OK OK CD 171 CD ON OK CD CD

RBW1D6 Event Tree Top Event for Loss of Inventory in Window 1

E Frequency Calculation (or R8WI

Froo^ency of Non-fecoverefcif— — eroNt* Loss of Rrt* ZJ

FREO-RW2B

Durolion of Frequency of POS t> of o ProbobifilJ_y ProbobiMy X> of Refueling Refueling Refueling Outage of POS » Oven thai IE occurs Outoge Refueling Outoge In wl given Rtt IT U OORATION-RTO

PC J 6 of o Refueling Probobifily Duration of Frequency of C -olned Molntonenco Duration of Probability PnS 6 of o Drdned Outoge thai E occurs F OS 6 of Refueling Refueling fOS 6 of Orolned that E occurs * olntenonce Ouloge In wl given R6 Outoge I onlonooce Outage in wl given 06

POS-R6 0URATI0N-R6 RCS Makeup in Window

RCS Makeup in RHR2B, Window 1

MRBW1

Foilure to Diagnose Failure to Makeup Loss of Inventory Given Inventory in Window 1 Loss in Window 1

0-RBW1-XHE A-RBW1-XHE-M-12

FAL HIGH PRES INSUF FLOW FRM FAIL HIGH PRES INSUF FLOW FRM FLOW TO HOT LEG-; 2 LOW PRES SI FLOW TO CLD LEG-2 2 LOW PRES SI CHRG PMP MANUAL PMPS TO HOT LEGS CHRG PMP MANUAL PMPS TO COLD LEGS

D2HLG LPIHLG D2 D6-C I

'.<)

3?- Restore RHR given RHR2B in Window m §

Restore RHR Given RHR2B w. in Window 1 mi

RRBW1

Failure to Restore Foilure to Diagnose Loss of RHR RHR, given RHRB Loss of Inventory POSs 3-13 in Window 1 in Window I

W3-S A-RBW1-XHE-R-4 D-RBW1-XHE

~%t Safety Valves Not Removed in Window

Safety Valves Not Removed in Window 1

V/1

•

P0S-R6

Pressurizer Sofety Valves Removed in W1R6

PZR-SV-REM0VEDW1 Reflux Cooling in Window 1

Reflux Cooling Given o RHR3 in Window 1

Foiture to Diagnose RCS Loops Isolated Loss of Inventory to Couse FoiKire in Window 1 of Reflux Cooling

SRBV 1013 SRBVMGOO ISO-WI

0-RBW1-XHE

, INSUF aow TO Operotor Foiluro ! SO FRM AT LEAST to Feed SGs in 1 AFW PUMP Window t-RHR2B

LSW1 1? "9" SRBV 1GII A-RBWl-XHE-SF-9 SRBV1G3

Operotor Foilure FALURE OF FAL TO CLOSE FALURE OF Operator foilure to Bleed the SECONDARY SIDE BOTH PORVS SECONDARY SK5E -to estoblish SG9 1 given RHR2B HEAT REMOVAL HEAT REMOVAL reflux offer PRT rupture

SSHW1 PORVI SSHWt A-RBW1-XHE-S1-9 A-RBW1-XHE-S2-8 RCS Loops Isolated to Cause Failure of Reflux in Window 1

mt 00 n ISOT IG6

I I 'OS 6 of o Droined NO aCS SIGNAL Maintenance Outoge OPER OR AUTO TRAIN A 9" P0S-D6 ISOV IG5

Loops Isololed Secondory Side Secondory Side in window 1 of of SGs Droined of SGs Droined 06 in POSs 6 of in POSs 6 or Oroined Moinlenon K) or Refueling

L00PIS0LATE0O6 SGS-DRAINED-CSO SGS-DRAINEO-R L00PISO.ATE0IR10 LO0PISOLATE0IR6 SGS-DRAINEO-R Feed and Bleed the RCS in RHR2B, Window 1

Feed ond Bleed the RCS in RHR2B, Window I

uFREW1

Food ond Bleed Sofoty Volve the RCS In RHR2B Removed in Window in Window 1 I

FRBVMGK) SV-Wt

Foiluro lo Diognoso m Loss of Inventory i in Window 1 as T

FRBV '1GO

D-RBWI-XHE

FRBV 1G3 FRBV 1G2

FALURE OF FEED Operotor failure FALURE OF FEED Operator Foikjre AND SPLL USING ot use LHSI In AND SPLL USING to use HHSI in LPI . Feed ond Spill HPI feed ond spill in Window 1 in Window 1

FSW12L FSW12H A-RBW1-XHE-a-5 A-RBW1-XHE-FH-5 Safety Valves Removed in Window

Safety Valve Removed in Window 1

SV-W1

• POS 10 of a POS 6 of a Drained o Refueling Outage Maintenance Outage

aSV-V1G0 POS-R10 POS-D6

POS 6 of a Refuelim Pressurizer Outage Safety Valves Removed in W1R6

POS-R6 PZR-SV-REM0VEDW1 and Bleed the RCS with V failed RHR2B, Window 1

Feed ond Bleed the RCS in RHR2B in Window 1 0 FRBWW Failure to Oiognose Loss of Inventory in Window 1 M FRB0V WGO D-RBW1-XHE

• FRBV WG2 0 FRBV MJ3

I I Operator Failure FALURE OF FEED Operator failure FAILURE OF FEED to use HHSI in AND SPLL USING ot use LHSI in- ,. AND SPILL USING

feed and spill HPI Feed and Spill •. V \ •, LPI in Window 1 A rin Windo vw 1 A o FSW12H FSW12L A-RBW1-XHE-FH-10 A-RBWI-XHE-a-10 Gravity from RWST in RHR2B, Window

Gravity from RWST in RHR28 in Window 1

GRIIW1

Safety Valve Removed in Window 1

GRB\ MG2 SV-W1

Failure to Diagnose Operator Failure INSUF FLOW Loss of Inventory to estoblish THROUGH LOW HEAD in Window 1 gravity feed INJECTION FLOW in window 1 PATH

06-CG

D-RBW1-XHE A-RBW1-XHE-G-6 Failure of High Pressure Recirculation in Window 1

FoOir* of Hoh, FVMKXfc * ftaeVcunJo r In VMw 1

HPR cj

• ,—WM« 1ft — In Wi«w RiHrcviUUQQ ^Uf^* t9 In WWto» 1 1 In \tfn*w 1 rent Exis

C&6 fiat CR& UC* PBBWiX u A-R&vi-xm-a-i A-MWl-IBB-O-J D-MKL-XKB

EPB. I© LC3 ttCR MT ailure of Recirculation Spray in Window 1-cause HPR failure

jilure of Recirculation Spray in Window 1

PR1W1

loss of HPSH dui to open contoinmenl

PRBV '110

CON-VFC-RP-COREM

Operator Failure Failure to Diognose to Establish Loss of Inventory Recirculation in Window 1 Spray in W1

PRBV1G0

A-RBW1-XHE-P-4 D-RBW1-XHE

"ALURE OF OUTSIDE FALURE OF INSIDE SPRAY RECRCUUTION SPRAY RECIRCUUTION

F2LPSD FT.PS0 Failure of High Pressure Recirculation in Window 1

_ FoihTi of Wg.. FYMKr*R« eVcuoUon In WMnr 1

HPR TJ

i Lofis 01 Wtt LVlnt •toWoMh F&Steam In Win-few 1 &W«r CH"RO PUU> SICT lif WruEi 1

b-Mmj-ias A-SBYl-Xm-G-Q

Foibri lo OToonoM ffet/MnKvi 1ft I Low of WflEMnt ^WtaiT t«» 01* RKft Evant Widow I Tl Win*« 1 tftH P floSro nil Wn

l*» to If l to not t*f »01 L<| UNITY IRBW2 MRBW2 RRBW2 VW2 SRBW2 FRBW2 GRBW2 CRBW2 SBQ H END-STA TF,

i OK 2 OK 3 OK 4 CD m 5 CD 6 CD 7 OK 8 OK 9 CD 10 CD 11 OK 12 CD 13 CD 14 CD 15 OK 16 OK 17 CD 18 CD

RBW2R6 Event Tree m • Top Event for Loss of Inventory in Window 2

E Freguency Colci/lotion for RBV/2

Frequency of Non-recoverable Loss of RHR

RBWI02 FREQ-R.fi 2B

Probobitly of POS 10 Given RefueSng Outage

RBW!G3

OlRATWN-fltt PR0B-W2RM

P(S 6 of o Refuefno . Ourotion of Probability Outage »OS 6 of Drained thot E occurs I lointenonee Outage in W2 given 06 RCS Makeup in Window 2

RCS Makeup in RHR2B, Window 2

i

MRUW2

Failure to Diagnose Failure to Makeup Loss of Inventory Given Inventory in Window 2 Loss in Window 2

D-RBW2-XHE A-RBW2-XHE-M-12

FAIL HIGH PRES INSUF FLOW FRM FAIL HIGH PRES INSUF FLOW FRM FLOW TO CLD LEG-3 2 LOW PRES SI FLOW TO HOT LEG-3 2 LOW PRES SI CHRG PMP MANUAL , PMPS TO COLD CHRG PMP MANUAL PMPS TO HOT LEGS LEGS

D6-C D2HLG LPIHLG Restore RHR given RHR2B in Window 2

Restore RHR Given RHR2B in Window 2

00 o RREW2

Foilure to Restore Foilure to Diagnose Loss of RHR RHR, given RHR2B Loss of Inventory POSs 3-13 in Window 2 in Window 2

W3-S

A-RBW2-XHE-R-4 D-RBW2-XHE Safety Valves Not Removed in Window 2

Safely Valves Not Removed in Window 2

VV2

POS 10 of o 30S 6 of a Droined Refueling Outage Maintenance Outage

POS-D6

P0S-R6

Pressurizer Safety Volves Removed in W2R6

PZR-SV-REMOVEDW2 Reflux Cooling in Window 2

Reflux Cooling Given o Rrttt in Window 2

failure to Diagnose RCS Loops Isolated Loss of Inventory to Couse Failure in Window 2 of Reflux Cooling

SRBW'GU IS0-W2 D-RBW2-XHE

IMSIF FLOW TO Operator Foihxe SO FRM AT LEAST to Feed SGs in I AFW PIM> Window 2-2B

LSW23 A-RBW2-XHE-SF-9

Operator Failure FALLRE OF SGS FAL TO aOSE FALLRE OF SGS Operolor failure to Bleed the STEAM PATH TO BOTH PORVS STEAM PATH TO to establish SGs In Window IttMl STEAM HEAOER WW STEAM HEAOER reflux oiler X. PRT rupture

SSHW23 PORV1 SSHW23 A.-RBW2-Xr£-S1-9 A-RBW2-XHE-S2-9 RCS Loops Isolated to Cause Failure of Reflux in Window 2

LOOPISOLATED2D8 SGS-DfWINED-CSD SGS-DRANED-R L0OPISOLATKD2R10 L0OPISOLATED2R0 SGS-DRAINED-R Feed and Bleed the RCS in RHR2B, Window 2

Feed and Bleed the RCS in RHR2B, Window 2

FRIIW2

Feed and Bleed Sofety Valve the RCS in RHR2B Removed in Window in Window 2 2

FR8V 2G10 SV-W2 m

Foilure to Diagnose Loss of Inventory in Window 2

FRBV2GO

D-RBW2-XHE

FRB\ '2G2 FRBV2G3

I . I FALURE OF FEED Operator Failure FALURE OF FEED Operator foilure AND SPLL USING to use HHSI in AND SPU USING ot use LHSI in HPI feed and spill LPI Feed and Spill A in Window 2 in Window 2 FSW12H o FSW12L A-RBW2-XHE-FH-5 A-RBW2-XHE-FL-5 Safety Valves Removed in Window 2

Safety _ Valve Removed in Window 2

SV- •W2 I POS 10 of a POS 6 of a Droined Refueling Outage Maintenance Outage n f^ r^ sv-\ «G0 P0S-R10 P0S-D6

1 1 POS 6 of a Refuelint Pressurizer Outage Safety Valves Removed in W2R6

•

o PZR-o P0S-R6 -SV-REM0VEDW2 Feed and Bleed the RCS with failed in RHR2B, Window 2

Feed and Bleed the RCS in RHR2B in Window 2

Foilure to Oiognose Loss of Inventory in Window 2

mt 00 0\ FRBW 3VG0 D-RBW2-XHE

FRBW M32 FRBW 2VG3

FALURE OF FEED Operator Failure Operator foilure FALURE OF FEED AND SPLL USING to use HHSI in to use LHSI in AND SPLL USING HPI feed and spill Feed and Spill LPI in Window 2 in Window 2

FSW12H FSW12L A-RBW2-XHE-FH-10 A-RBW2-XHE-FL-10 Gravity from RWST in RHR2B, Window 2

Gravity from RWST in RHR2B in Window 2 m • f 1 a> GREW2 1 Safety Valve Removed in Window 2

L: > A GRBV 2G2 SV-W2

1 | Operator Failure INSUF FLOW Foilure to Diagnose to Establish THROUGH LOW HEAO Loss of Inventory Gravity Feed INJECTION FLOW in Window 2 in Window 2 APATH o D6- •CG o A-RBW2-XHE-G-6 D-RBW2-XHE *5fi cum U A

» O!

3b

& 3! JiU

L 3 5s| as

r 3 as

SHi ST y*l

5 £ 11 11 £ S# / "s"«s /I § -°=i« < a. < z» \ *? \ f. f

*1 Si 1o 53

as a o & P, '" eg

E-88 Failure of Recirculation Spray in Window 2-cause HPR failure

Fpilure of Recirculotion Spray in Window

PREW2

loss of HPSH du to open containment

m PRBW !G20 00 ' CON-VFC-RP-COREM

Failure to Diagnose Operator Failure Loss of Inventory to Estoblish in Window 2 Recirculotion Sproy in W2

PRBV 2G0 D-R8W2-XHE A-RBW2-XHE-P-4

rALURE OF OUTSOE FALURE OF INSIDE IPRAY RECIRCLLATION PRAY RECIRCULATION

F2LPSD FLPSD Failure of High Pressure Recirculation in Window 2

F03l« Of. ttfltl MU« FtaeVeumJo In WMjvr 2

HPR X-Tie RWSTs ZY u

rdUr« oT Rftfrcutotlo i LPR Lam cf wS"Even Epntf tn VAr\6w/ , t6 Crew COfti»« , LPR fcfi WifKfew 2 OWN PUVP SICT T>€ FECR UXE Wndwr 2 (F&Steaidts ) (F&ipunft l D-trtwa-iHB A-rawt-zni-fl-e b-unra-xm A-BWta-2ffiB-I

"oV« of Rfrfrcutolk) i Eprey In window Lcog of rrw tvflm Y«nt Xxtilt In Win*. 2 2 n a Hn Widow 2 far Fwd u>d Jk-Jtswa-xra-c-o A-aswa-XHi-o-a u D-Mwa-rnc

jftasvuBui UNITY IRBW3 MRBVT3 RRBW3 VW3 FRBW3 GRBW3 SEQ ff END-STATE-NAMES

m. 2s m 1 OK 2 OK 3 OK 4 CD 5 CD i 6 OK 7 CD 8 OK 9 CD 10 CD 11 OK 12 CD

RBW3R6 Event Tree Vr\ UNITY IRBW3 MRBW3 RRBW3 VW3 FRBW3 GRBW3 SEQ H END-STATE-NAMES

1 OK 2 OK 3 OK 4 CD m 5 CD 6 OK 7 CD 8 OK 9 CD 10 CD 11 OK IS CD

RBW3R10 Event Tree UNITY IRBW3 MRBW3 RRBW3 SRBW3 FRBW3V SEQ g END-STATE-NAMES

I

SSs

OK OK OK OK CD m OK OK CD

I RBW3D6 Event Tree Top Event for Loss of Inventory in Window 3

E Freojflrxy Calculation for R3W3

Frequency of Non-rMoveroWe LOM of Rrf* a a

Ou-otlon ol Frequency of POS W of o Probability Probcbitty POS t) of Refofllirtt Refusing Refueling Outoge that E occurs Oulogo or POS n Gton in wj 9wen RTO u ReJueKno, Outage U

POS 6 of o RefueK g Probobaiy Duration of Frequency of Drained Moinlononc* Duration of Probability POS 6 of o Orolne Out o?s (hat E occurs R6 of Refuel Refuefing POS 6 of Droined thol E occurs Mointe nonce Ouloo/ in w3 gwen R6 Maintenance Oulcg* in vti

REFUEL RCS Makeup in Window 3

RCS Makeup in RHR2B, Window 3

MRUW3

Foilure to Diagnose Failure to Makeup Loss of Inventory Given Inventory in Window 3 Loss in Window 3

D-RBW3-XHE A-RBW3-XHE-M-10

FAIL HIGH PRES INSUF FLOW FRM FAL HIGH PRES INSUF FLOW FRM FLOW TO HOT LEG-3. 2 LOW PRES SI FLOW TO CLD LEG-3 2 LOW PRES SI CHRG PMP MANUAL PMPS TO HOT LEGS CHRG PMP MANUAL PMPS TO COLD LEGS

D2HLG LPIHLG D6-C Restore RHR given RHR2B in Window 3

Restore RHR Given RHR2B in Window 3 mi 0\

RREW3

Failure to Restore Foilure to Diagnose Loss of RHR RHR, given RHR2B Loss of Inventory POSs 3-13 in Window 3 in Window 3

W3-S A-RBW3-XHE-R-4 D-RBW3-XHE Safety Valves Not Removed in Window 3

Sofely Volves Not Removed in Window 3

m

vw:G4 P0S-R6

Pressurizer Pressurizer Sofety Votves Sofety Volves Removed in W3R6 Removed in W3R6

PZR-SV-REM0VEDW3 PZR-SV-REM0VEDW3 Reflux Cooling in Window 3

Reflux Coolinq Given o Rrfi3 in Window 3

Failure to Diagnose RCS Loops Isolated Lose of Inventory lo Cause Failure in Window 3 of Reflux Cooling

60-W3 D-RBW3-XHE

NSLf FLOW TO SG FRM AT LEAST I AFW PUMP

LSW23 SRBV3G11 A-RBW3-XHE-SF-8

Operator Failure FALURE OF SGS FAL TO aOSE FALURE OF SGS Operator failure to Blood the STEAM PATH TO BOTH PORVS STEAM PATH TO to establish SGs in Window iWIN STEAM HEADER *IN STEAM HEADER reflux after 3 PRT rupture

SSHW23 PORVI SSHW23 A-RBW3-XHE-S1-8 A-RBW3-XHE-S2-8 RCS Loops Isolated to Cause Failure of Reflux in Window 3

m

SGS-DRAINED-CSD LOOPISOLATED306 LOOPISOLATE03RX) SGS-DRANEDf-R IO0PIS0LATED3R6 SGS-DRAINED-R Feed and Bleed the RCS in RHR2B, Window 3

Feed ond Bleed the RCS in RHR2B, Window 3

Feed and Bleed Safety Votve the RCS in RHR2B Removed in Window in Window 3 3

FRBW30 SV-W3

Failure to Diagnose Loss of inventory in Window 3

FRBaV 3G0 D-RBW3-XHE

FRW3G3

FALURE OF FE£B Operator failure ANO SPLL USING ot use LHSI In LPI Feed and Spill in Window 3

FSW34L FSW34H A-RBW3-XHE-FI-4 A-R8W3-XHE-FH-4 Safety Valves Removed in Window 3

Safety Valve Removed in Window 3

SV-W3

POS 6 of a Drained Maintenance Outage

SV-V3G00 SV-\ /3G0

POS-D6

POS 6 of a Refuelim Pressurizer POS 10 of a Pressurizer Outage Safety Valves Refueling Outage Sofety Valves Removed in W3R6 Removed in W3R6

P0S-R6 PZR-SV-REM0VEDW3 P0S-R10 PZR-SV-REM0VEDW3 Feed and Bleed the RCS with failed in RHR2B, Window 3

Feed and Bleed the RCS in RHR2B in Window 3

Failure to Diagnose Loss of Inventory in Window 3 i O Q FRBW '3VG0

D-RBW3-XHE

FR8W 3VG2 FRBy3VG3

FALURE OF FEED Operotor Failure Operator. failure FAILURE OF FEED AND SPILL USING to use HHSI in ot use LHSI in AND SPILL USING HPI feed and spill Feed and.Spill LPI in Window 3 in Window A 3.

FSW34H FSW34L A-RBW3-XHE-FH-8 A-RBW3-XHE-FL-8 Gravity from RWST in RHR2B, Window 3

Gravity from RWST in RHR2B in Window 3

& o u GREW3

Safety Valve Removed in Window 3

GRBV 3G3 SV-W3

Failure to Diagnose Operator Failure INSUF FLOW Loss of Inventory to establish THROUGH LOW HEAD in Window 3 gravity feed INJECTION FLOW in window 3 PATH

D6-CG D-RBW3-XHE A-RBW3-XHE-G-5 to S <

< a z OOOOOOUOOUOU

-o-

m

3=

a>

3= > c >

t0

IX c: CD

IS rr 2

a

>-

E-104 UNITY IRBW4 MRBW4 RRB1V4 VW4 FRBW4 GRBW4 SEQ ff END-STATE-NAMES

1 OK 2 OK 3 OK 4 OK m 5 CD 6 OK o 7 CD 8 OK 9 OK 10 CD 11 OK 12 CD

RBW4R10 Event Tree UNITY IRDW4 MRBW4 RRBW4 SRBW4 FRBW4V SEQ # END-STATE-NAMES

OK OK OK OK CD m OK O OK 0\ CD

R8W4D6 Event Tree Top Event for Loss of Inventory in Window 4

E Freouencv Calculation for R3W4 7~*\

Frequency of Non-r«overobfe Low of Rtf* zy FREQ-RHHB U

Dtrotlon of Fraquancy of POS 10 of a Probability Probobifty POS *) of Refuefn i Refueling Refueling Outoge of POS X) Given that E occurs Outoge Refueling Outogo In W4 given R» U RBMC3

POS 6 of o Rflfuflk' g ProbobiKly rxrotion of Frequency of Droined Mdntonenct Dirotion of ProbcbiEly POS 6 of o Oroine] Ouloga (hot E occurs R6of Refwl Refueling POS 6 of Drowned lhat E occurs Maintenance Out' 'in W4 g>*n R« Mointertoneo Outog* In W4 grven 06

DURATION-R6 DURATION-06 RCS Makeup in Window z-

RCS Makeup in RHR2B, Window 4

MRISW4

Failure to Diagnose Failure to Makeup Loss of Inventory Given Inventory in Window 4 Loss in Window 4

MRBV4G1

D-RBW4-XHE A-RBW4-XHE-M-11

FAIL HIGH PRES INSUF FLOW FRM FAIL HIGH PRES INSUF FLO1 W FRM FLOW TO CLD LEG-: 2 LOW PRES SI FLOW TO HOT LEG-; 2 LOW PRES SI CHRG PMP MANUAL PMPS TO COLD CHRG PMP MANUAL PMPS TO HOT LEGS LEGS

D6-C D2HLG LPIHLG Restore RHR given RHR2B in Window 4

f Restore RHR Given RHR2B *& in Window 4

mi o RREW4

Failure to Restore Failure to Diagnose Loss of RHR RHR, given RHR2B Loss of Inventory POSs 3-13 in Window 4 in Window 4

W3-S A-RBW4-XHE-R-5 D-RBW4-XHE Safety Valves Not Removed in Window 4

m o

VYMG4 VYMG1 P0S-R6 POS-R10

Pressurizer Pressurizer Safely Volves Sofety Volves Removed in \(/4R6 Removed in W4R6

PZR-SV-REM0VEDW4 PZR-SV-REM0VEDW4 Reflux Cooling in Window 4

Reflux Coolinq Given o RHw In Window 4

Foilure to Oiaonose RCS Loops Isololed Loss of Inventory to Cause Foilure in Window 4 of Reflux Cooling

SRBU 4GI3 60-W4 0-RBW4-XKE

INSUF ROW TO Operator Foilure I SG FRM AT LEAST to Feed SGs in I AFW PUMP Window 3-RHR28

LSW4 SRBV4G3 1? A-RBW4-XHE-SF-8 SRBW4G11

Operator Foilure FALURE OF FAL TO aOSE FALURE OF to Bleed the SECONDARY SIOE BOTH PORVS SECONDARY SICC SGs In Window 4 HEAT REMOVAL HEAT REMOVAL

SSHW4 PORVI SSKW4 A-RBW4-XHE-S1-8 A-RBW4-XHE-S2-8 RCS Loops Isolated to Cause Failure of Reflux in Window 4

L00PISCLATED4D6 SGS-DRAINED-CSD SGS-CRANED-R LOOPISOATED^RK) IOCPISOATED4R6 SGS-DRAWED-R Feed and Bleed the RCS in RHR2B, Window 4

Feed and Bleed the RCS in RHR2B. Window 4

nFREW4

Feed and Bleed Safety Valve the RCS in RHR2B Removed in Window in Window 4 4

FRBV40 SV-W4

Foilure to Oiognose Loss of Inventory in Window 4

D-RBW4-XHE

Operator foilure FALURE OF FEED Operotor Foilure FAILURE OF FEED ot use LHSI in AND SPLL USING to use HHSI in AND SPILL USING Feed and Spill LPI feed and spill HPI in Window 4 in Window 4 '

FSW34L FSW34H

A-R8W4-XHE-a-5 A-RBW4-XHE-FH-5 Safety Valves Removed in Window

Safety Valve Removed in Window 4

SV--W4

POS 6 of a Drained Maintenance Outage

SV-V4G00 SV-W4G0 POS-D6

Pressurizer POS 10 of a Pressurizer Safety Valves Refueling Outage Safety Valves Removed in W4R6 Removed in W4R6

POS-R6 PZR-SV-REMOVEDW4 POS-R10 PZR-SV-REMOVEDW4 Feed and Bleed the RCS with V failed in RHR2B, Window 4

Feed and Bleed the RCS in RHR2B in Window 4

Foilure to Diagnose Loss of Inventory in Window 4 t—»

FRBV 4VG0 D-RBW4-XHE

FRBV 4VG2 FR8U4VG3

Operator Foilure FAILURE1 O F FEED Operotor failure FALURE OF FEED to use HHSI in AND SPLL USING ot use LHSI in AND SPILL USING feed and spill, HPI Feed and' Spill LPI in Window '4 • in WindoW 4' .

FSW34H FSW34L A-RBW4-XHE-FH-8 A-RBW4-XHE-FL-8 Gravity from RWST in RHR2B, Window 4

Gravity from RWST in RHR2B in Window 4

m GRfW4 i t—* OS Safety Valve Removed in Window 4

GRBV4G3 SV-W4

Operator Failure INSUF FLOW Failure to Diagnose to establish THROUGH LOW HEAD Loss of Inventory gravity feed INJECTION FLOW in Window 4 in window 4 PATH

D6-CG

A-RBW4-XHE-G-5 D-RBW4-XHE Appendix E.3 Event Tree and High Level Fault Trees for Non-recoverable Loss of RHR(RHR3)

E-117

•-^.'^S^MiJUf-/- '-'•$M:: UNITY IR3W1 VW1 SR3W1 FR3W1 GR3W1 CR3W1 SEQ ft END-STATE-NAMES

OK OK CD CD CD mi h-» OK t—» OK 00 CD CD

R3W1R6 Event Tree UNITY IR3W1 FR3W1V CR3W1V SEQ It END-STATE-NAMES

OK OK CD m CD

R3W1D6 Event Tree I Top Event for Loss of RHR - R3 in Window 1

IB Frequency Calculation for R3ffi

Frequency of Non-recoveroblo Loss ol Rtf* ZJ

>—i * fN> o

Oirolion of Frequency of POS JO of a Probobillly Probcbility )S W of Refuefing Refueling Refueling Ouloge of POS X> Owen (hot £ occurs Outoge RefueSng Outage In wl gtven RIO u U

. Durotion of Frequency o( POS 6 of o Refueling ProooWfily C -oined Mointonence ^ Duration of Prooob&ly Pt$ 6 ot o Drained F3S 6 of Refueing Refuel rig Outoge that E occurs '03 $ of Droned that IE! occurs * otntenance Outoge Ouloge In wl given R6 Kjojntenonce Outoge in wl given 06

REFUEL PR0B-WO6 Safety Vqjves Not Removed in Window 1

Safety Volves Nol Removed in Window 1

VW1 m

to i

P0S-R6 «

Pressurizer Sofety Volvos Removed in W1R6

PZR-SV-REMOVEOWl Reflux Cooling Given RHR3 in Window 1

Rotlux Cooling Given o RHR3 In Window 1

SR3W1 1 1 FoiJure to Diagnose RCS Loops Isolated Non-recoverable to Couse Foilure Loss of RHR of Reflux Cooling in Window t

() n A SR30V 1G1 3 SR3Y.IC0O ISO-W1 D-R3tYI-XHE I I Operator Foilire WSUF aow TO to Feed SCs in S SO FRM AT LEAST Window 1-R3 1 AFW PUMP A <0 D ow LSWI SR3V '1G3 SR3V, IGII A-R3WI-XHE-SF-8 1 1 1 Operator Failure FALURE OF FAL TO aOSE FALVRE OF Operotor lailure to Bleed the SECONDARY SIDE BOTH PORVS SECONDARY SIOE to establish SGs 1 given R3 HEAT REMOVAL HEAT REMOVAL reflux otter PRT ruoture A A A A A SSHW1 PORVt SSHWt

A-R3W1-XHE-S1-8 A-R3W1-XHE-S2-8 RCS Loops Isolated to Cause Failure of Reflux in Window 1

RCS Loops Isotoled to Couso Foilure of Reflux Cooing

ISO W1

m t i—» a Q ISOV WO ISCV

POS 10 of o I OS 6 of o Refueling Rofuotng Outoge Outogo 71 GOV, W2 0 ISOWIGW POS-RK) P0S-R6

Secondory Side Secondory Side Loops Isolated Loops Isolated Secondory Side of SGs Droinod of SC3 Oroined in of window in window 1 of of SGs Drained In POSs 6 of in POSs 6 or 1 of RtO R6 in POSs 6 or Drained Molntenon 10 or Refueling 10 or Refueling

LOOPISOLAieOI06 SGS-DRAINEO-CSO SGS-DRAINED-R L00PIS0LATEDIR10 LOOPISOLATE01R6 SGS-DRAINED-R Feed and Bleed the RCS in RHR3, Window 1

Feed ond Bleed the RCS in RHR3, Window 1

uFR;WI

Feed ond 8leed Safety Valve the RCS in RHR3 Removed in Window in Window 1 1

FR3VK) SV-WI

I

Failure to Diagnose Non-recoverable Loss of RHR in Window 1

FR3V1G0

0-R3W1-XHE

4 103 FR3V KS2 FR3V

I 1 Operator taikj/e,' FALURE OF FEED FALURE OF FEED Operator Failure ol use LHSI in ' AND SPLL USING Am SPLL USING to use HHSI in Feed ond Spill LPI HPI feed ond spill in Window 1 A in Window I o FSW12L FSW12H A-R3W1-XHE-FI-4 A-R3WI-XHE-FH-4 Safety Valves Removed in Window

Safety Valve Removed In Window 1

SV •W1 m POS 10 of a POS 6 of-o Drained Refueling Outage Maintenance Outage

SV-V1G0 POS-R10 POS-D6

POS 6 of a Refuelinc Pressurizer Outage Safety Valves Removed in W1R6

P0S-R6 PZR-SV-REM0VEDW1 Feed and Bleed the RCS with V failed in RHR3, Window 1

Feed and Bleed the RCS in RHR3 in Window 1

Failure lo Diagnose Non-recoveroble Loss of RHR in Window 1 m to 0\ FR3V1VG0 D-R3WI-XHE

FR3V1VG2 FR3.V1VG3

FALURE OF FEED Operator Failure Operator. failure FALURE OF FEED AND SPILL USING to use HHSI in o\ use LHSI in AND SPILL USING HPI feed and spill Feed and.Spill LPI in Window I in Window^ 1

FSW12H FSW12L A-R3W1-XHE-FH A-R3W1-XHE-FL-9 Gravity from RWST in RHR3, Window

Gravity from RWST in RHR3 in Window 1 m S oGR;.WI

Safety Volve Removed in Window 1

GR3V MG2 SV-W1

INSUF FLOW Failure to Diagnose Operator Failure THROUGH LOW HEAD Non-recoverable to establish INJECTION FLOW Loss of RHR gravity feed PATH in Window 1 in window 1

D6-CG

D-R3W1-XHE A-R3W1-XHE-G-5 Failure of High Pressure Recirculation in Window 1

roih/p ol Ujh In Witts* 1

CR^ITl I 1 HPR A ona0r ria l av-vi

I I I 1 fdhit iarn WW of »fl EvtM LPR In WM>» 1 am) w swr 7JEIECR 1KCE with T.Pf A M A A CM n PHOffl HI K2 CMI1CI D-itnn~xm X-WTfi-XHB-D-a i i I 1 1 i r faluri ta^QtanoM dUrt otRftfrtulatlo i Fo'ilxt to pfoonoi» tfet R«ndow Rfdreruliuoa L«* of FHft t\*nt Vent Exi WuUow t h Win*w 1 tar h \ttndw 1 A M A n n A A VTM PBOTl o\ y CBS NW CR5UC4 paawin A n VEKIU2 D-tlWl-JHB A-sOTi-mt-o-a JL-»m-XBH-

I i 1 HPK la HP» to r LCS RECB ICC A A Anot xtt A Failure of Recirculation Spray in Window 1-cause HPR failure .

Failure of Recirculation Spray in —WJjwtow—'-bwioxi—i—

PR;WI

loss of HPSH du i to open containment trj to PR3V10 CON-VFC-RP-COREM

Failure to Diagnose Operator Foilure Non-recoverable to Establish Loss of RHR Recirculation in Window 1 ' Spray in W1

PR3Y1G0 D-R3W1-XHE A-R3W1-XHE-P-3

FALURE OF INSIDE 7ALURE OF OUTSIDE SPRAY RECIRCULATION SPRAY RECIRCULATION

FtPSD F2LPS0 Failure of High Pressure Recirculation in Window 1

_ Foili/t ol. Koh FV«(Lf« FteeVei/aUon h 0Wrefcw 1 I HPK

Cfcfl ITC3

1 I i i : F&Steam fdlui ,t 4rCR81 ™1V0» D-ftavri-iHB A-R31U-XHC-C-I I I i 1 I 1 rdkM of flfrfriutollo Hit flimtw* Vi Lett of Ffrft Ev»M 6prcy In wtdow . B« sir 011] at Ion KVWO V«a\ Xrlilc Window t In W!n*w 1 s?r«r few ti «n*» 1 | for Fwd tod tv A r^ A n n A p\ fftSWUt n VWi PfcMM o\ / CB»1 JVC! C7181 1V09 vsnn.u O-fittfl-XHB A-UTl-XKe-D-ft A-»3ffL-XHH-<:-a D-&3WL-XB1

1 1 1 It* to UK to lid U| Hot Df LtsHral A A A A UNITY IR3W2 vwa SR3W2 FR3W2 GR3W2 CR3W2 SEQ a END-STATE-NAMES

1

§ I

OK OK CD CD CD m OK OK CD CD

R3W2R6 Event Tree UNITY IH3W2 SR3W2 FR3W2V CR3W2V SEQ H END-STATE-NAMES

OK OK OK CD m CD

R3W2D6 Event Tree Top Event for Loss of RHR— R3 in Window 2

IE Frequency Calculation for R3W2

nan

Frequency of Non-recoveroble Loss of RrR 73 IR3W !G2 FREQ-RHW

IRJWa; st4

Duration of Frequency of POS K) of o Probability Probability I OS K> of Rofuelng Refueling Refueling Outogo of POS X) Given that IE occurs Outage Refueling Outoge In wl grven R»

R3W !G3 R3aW >C4 0URATI0N-R10 REFUEL POS-RIO FRAC-P0S10 PR0B-W2RK)

Duration of Frequency of PIS 6 of a Refuefng Probobihty Voined Mai'ntanencr e , Duration of Probobitly fOS 6 ol o Drained R6 of Refuel Refueling I Ouloge that C occurs POS 6 of Droined thot IE occurs .fointenanco Outoge in w1 given R6 foitfenanco Outoge in wl given D6

0URATI0N-R6 REFUEL POS-R6 PROB-W2R6 DR-MT DURATI0N-D6 PROB-W2D6 P0S-D6 Safety Valves Not Removed in Window 2

Safety Valves Not Removed in Window 2

VV2

DOS 6 of a Drained Maintenance Outoge pi w *.

P0S-R6

Pressurizer Safety Valves Removed in W2R6

PZR-SV-REM0VE0W2 Reflux Cooling Given RHR3 in Window 2

Reflux Cooling Given o RHR3 In Window 2

Failure to Diagnose RCS Loop1s Isololed Non-recoverable to Cause Foilure Loss of RHR of Reflux Cooling in Window 2 ZT D-R3W2-XHE

Operator Failure ,. INSUF aow TO to Food SGs In 1 SG FRM AT LEAST Window 2-R3 I AFW PUMP a A-R3Vf2-XH8-SP-8

Operator Failure FALURE OF FAL TO aOSE FALURE OF Operotor foilure to Bleed the SECONDARY SOE BOTH PORVS SECONDARY SIDE to establish SGs 1 given R3 HEAT REMOVAL HEAT REMOVAL reflux after PRT rupture

\ PORV1 A-R3W2-XHB-SI-B A-R3WE-XHE-S3-8 RCS Loops Isolated to Cause Failure of Reflux in Window 2

RCS Loops Isototed to Couse Failure of Reflux CooSng

ISO -Yf2

• ...

i—> ON n ISO! 200 n 130^ 20 8 0 1S0V2G8

1 1 1 POS 6 of o Drained NO aCS SIGNAL POS K) of o IOS 6 of o Refueling Maintenonco Oufogo OPE R OR AUTO ftofueffng Outage Outage TRAIN A 7~ ( I SOI 803 ) 0 SOW;-010 o c RIO 1301 202 POS- R6 POS-D6 POS- t 1 . 1 Loops Isolote d Se condary Side Secondary Side Loops Isolated Loops Isolated SecorxJory Side in mrtiow 2 <> f of SCs Oroinod of SGs Drained in of Window in Window 2 of of SGs Drained D6 in POSs 6 of in POSs 6 or 2 of RIO R6 fn POSs 6 or Droi ned Mointenan 10 or Refuelina K) or Refuetino

) LOO cA T ED 2D8 SGS 0 SC R to P1S0L oS-DRANED- -DRAINED-CSO o o SGS-DRAINEO-oR LO0PISOLATE62R L00PIS0LATED2R6 Feed and Bleed the RCS in RHR3, Window 2

Feed and Bleed the RCS in RHU, uWindow 2 FR: W2

Feed end 8k>ed Sofety Valve the RCS in RHR3 Removed in Window in Window 3 2

SV-W2 m I Failure to Diognose Non-recoverable Loss of RHR in Window 2

FALURE OF FEED FAILURE OF FEED Operator Foilure AND SPLL USING AND SPa USING to use HHSI in LPI feed and spin m in Window 2

FSW12L FSW12H A-R3W2-XHE-FL-4 A-R3W2-XHE-FH-+ Safety Valves Removed in Window 2

Safety Valve Removed in Window 2 w i SV- W2 oo POS 10 of a POS 6 of o Drained Refueling Outage Maintenance Outage

SV-W2G0 P0S-R10 POS-06

POS 6 of a Refuelinc Pressurizer Outage Safety Valves Removed in W2R6

P0S-R6 PZR-SV-REM0VEDW2 Feed and Bleed the RCS with V failed in RHR3, Window 2

Feed and Bleed the RCS in RHR3 in Window 2

Failure to Diagnose Non-recoverable Loss of RHR in Window 2 Mi

FR3V 2VG0 D-R3W2-XHE

FR3V 2VG2 FR3V 2VG3

Operator Failure FAILURE OF FEED Operator failure FAILURE OF FEED to use HHSI in AND SPLL USING o\ use LHSI in AND SPILL USING feed and; spill HPI Feed and.Spill LPI in Window 2- . in WinddwA2

FSW12H FSW12L A-R3W2-XHE-FH-9 A-R3W2-XHE-FL Gravity from RWST in RHR3, Window 2

Gravity from RWST in RHR3 in Window 2

GR£Wa2

Sofety Votve Removed in Window 2

CR3Y 2G2 SV-W2

INSUF FLOW Failure to Diagnose Operotor Failure THROUGH LOW HEAD Non-recoverable to Establish INJECTION FLOW Loss of RHR Gravity Feed PATH in Window 2 in Window 2

D6-CG

D-R3W2-XHE A-R3W2-XHE-G-5 Failure of High Pressure Recirculation in Window 2

' In HM» 2

cufwa

HPR X-Tie RWfeT ZT ^ TJ

Optrotor Foilx*. LPR H&PffiffH . to orMft Cdmtot , LPR (F& tearrj) Tn «Wi» 2 2 CtWM PUVP SVCT m (J O x-uvi-xiot-o-a

0 dof Fbibr* tfat Htnoj* Vi '•Wrf^sS' * LCOa Or ItW (AAnt Y«ni htiU ffinlm 2 Tn Hin*» 2 for P«d tn

LTB to Lf* to LCS SECR Ite* tut I44 Failure of Recirculation Spray in Window 2-cause HPR failure for RHR3 Event

railure of Recirculation Sproy in Window 2

Failure to Diagnose Operator Failure Failure to Diognose Operator Failure FALURE OF FEED Non-recoveroble to Estoblish Non-recoveroble to Cross Connect AND SPLL USING Loss of RHR Recirculation Loss of RHR WST Given Successfil HPI in Window 2 Sprov in W2 in Window 2 "£"

nPR3\ '2G0 FSW12H D-R3W2-XHE A-R3W2-XHE-P-3 D-R3W2-XHE A-R3W2-XHE-X

FALURE OF OUTSIDE FALURE OF INSDE SPRAY RECIRCULATION SPRAY RECIRCULATION

F2LPSD FLPSD Failure of High Pressure Recirculation in Window 2

|ft-«»r*fticVeu«Jw^

cttajrar

HPR X-Tie RWSTs "ZJ TJ

Tpp Lorn OT r 3ft™ 2 [tlh OWN [TOP SICT m &s^p ^ T) T) ^ i^n a A-JUVi-XB2-<]-« foibr* to D'oonom in*, W^'* Leo* of FUR tvsnt fiW tewo h Wn*>w 2 iw ? a a W a A-IUffl-XHS-C-t x-Mwa-rim-o-i U

LTH Is Eat Ut Lcs ESPJ! MX UNITY IR3W3 VW3 FR3W3 GR3W3 SEQ H END-STATE-NAMES

OK OK CD CD m OK I CD

R3W3R6 Event Tree UNITY IR3W3 VW3 FR3W3 GR3W3 SEQ H END-STATE-NAMES

m 1

OK OK CD CD OK CD

';.«>, «»:«• R3W3R10 Event Tree UNITY IR3W3 SR3W3 FR3W3 END-STATE-NAMES

OK OK •c OK CD

R3W3D6 Event Tree Top Event for Loss of RHR- R3 in Window 3

CdnArtion for R3W3

fijfo

Frequency of 'ton-rtCOvWOtfc lott Ol Rf«

\ / RW02 n

. EXrotion of r*oju«ncy ol POS t) ol o Probobilly P )S 10 of Rif wring Rtfi*w>g Rtfuefog Ojtog* of POS n cfrw thol C occvi Outogo Refutft>3 Outog« h w3 0ven Rfj u U

PC > 6 of o Reforfna Probcfcrfly Ourolton of Ffoquency of (o'ned Uointartenet Oiration of ProJjaWily P< S 6 ol a (Veined OutOQt lhat E oocirs R$ of R«fu«l RiftMing OS 6 ol Oronod that E occvs t, jintenance 0U1OQ« In «3 0>«n R6 I anUnonc* Outoo* in »3 OJvtn D6 Safety Valves Not Removed in Window 3

mi •—* -p>. 00

VWSG1 P0S-R6 P0S-R10

Pressurizer Pressurizer Sofety Valves Safety Valves Removed in W3R6 Removed in W3R6

PZR-SV-REM0VEDW3 PZR-SV-REM0VEDW3 Reflux Cooling Given RHR3 in Window 3

Reflux Cooling Given o RHR3 in Window 3

Failure lo Diognose RCS Loops Isolalcd Non-recovoroblo lo Couse Foilure Loss ot RHR of Reflux Cooling in Window 3 TJ "5" SR3W !G00 60-W3 SR3WJG13 D-R3W3-XHE

INSUF ROW TO Operator Foiluro SG FRM AT LEAST to Feed SGs in I AFW PUMP Window 3

LSW23 SR3V 3G3 SR3Y3G11 A-R3W3-XHE-SF-7

Operator Foiluro FALURE OF SGS FAL TO aOSE FALURE OF SGS Oporotor foiluro to Bleed the STEAM PATH TO BOTH PORVS STEAM PATH TO to establish SGs given R3 MIH STEAM HEADER ittIN STEAM HEADER reflux offer PRT rupture

SSHW23 PORV1 SSHW23 A-R3W3-XHE-S1-7 A-R3W3-XHE-S2-7 RCS Loops Isolated to Cause Failure of Reflux in Window 3

m o

SGS-ORAINED-CSD L0OPIS0LATeD3O6 L00PISaA,TE03RW SGS-DRAN&-R LOCPISCLME03R6 SGS-DRAINED-R Feed and Bleed the RCS in RHR3, Window 3

Feed ond Bleed the RCS in RHR3, Window 3

•FR;W 3

Feed ond Bleed Sofety Volvo the RCS in RHR3 Removed in Window in Window 3 3

FR3 130 SV-W3

tiD Failure to Diagnose >—* Non-recoveroble Loss of RHR in Window 3

FR3V 3G0 R3W3-XHE

FR3V 3G2 FR3V 303

Operoto/ Failure FAILURE OF FEED FALURE OF FEED Operator foilure to use/ HHShin AND SPILL USING AND SPU gsiw ot use LHSI in feed ohd 'srjil LPI ' X Feed ond Spill in Window 3 in Window 3

FSW34H FSW34L A-R3W3-XHE-FH-3 A-R3W3-XHE-FL-3 Safety Valves Removed in Window

Safety Valve Removed in Window 3

SV--W3

POS 6 of a Drained Maintenance Outage

SV-V'JGOO SV-W3G0 POS-D6

Pressurizer POS 10 of a Pressurizer Safety Valves Refueling Outage Safety Valves Removed in W3R6 Removed in W3R6

P0S-R6 PZR-SV-REMOVEDW3 POS-R10 PZR-SV-REMOVEDW3 Feed and Bleed the RCS with V failed RHR3, Window 3

Feed ond Bleed the RCS in RHR3 in Window 3

Failure to Diognose Non-recoveroble Loss of RHR in Window 3

FR3aV 3VG0 0-R3W3-XHE

7? FR3W 3VG3 FR3W3VG2 1 1 Operator Failure FALURE OF FEED Operator failure FAILURE OF FEED to use HHSI in AND SPLL USING ot use LHSI in AND SPILL USING feed and spill HPI Feed ond Spill LPI in Window 3 in Window 3 A FSW34H () FSW34L A-R3W3-XHE-FH-7 A-R3W3-XHE-FL-7 Gravity from RWST in RHR3, Window 3

Gravity from RWST in RHR3 in Window 3 m

GR:W3

Safety Valve Removed in Window 3

GR3V 3G3 SV-W3

INSUF FLOW Failure to Diagnose Operator Failure THROUGH LOW HEAD Non-recoverable to establish INJECTION FLOW Loss of RHR gravity feed PATH in Window 3 in window 3

06-CG D-R3W3-XHE A-R3W3-XHE-G-4 UNITY IR3W4 VW4 FR3W4 GR3W4 SEQ U END-STATE-NAMES

OK OK OK CD m OK CD

R3W4R6 Event Tree UNITY IR3W4 VW4 FJJ3W4 GH3W4 SEQ tt END-STATE-NAMES

OK OK OK CD OK CI CD 0\

R3W4R10 Event Tree UNITY IR3W4 SR3W4 FR3W4V GR3W4 SEQ H END-STATE-NAMES

OK OK OK CD m

R3W4D6 Event Tree I Top Event for Loss of RHR- R3 in Window 4

E freqjorey Cdctiolien for R3W4

Frequency ol Non-fecovwoWo LOM ol RHl ZJ

U

CXrotion of Frequency ol POS t) of 0 Probobitty Probability POS t) of RefueCn Refusing Refueling Outoge of POS 10 Given that C occiss In W4 gVen RIO (X1I094 Refuefng Outooo U

Dirotlon of Frequency of POS 6 of o Refoefif a ProbobiHy Drained Mo'ntonence Oirotbn of Probability POS S of a Drone R6 of Refuel Refueling Ouloge thot £ occtrs POS 6 of Ora'ned tbot E occirs Maintenance. Outoot in W4 on/00 R6 Mo'ntenoncs Ouloge in W4 given 06 i t Safety Valves Not Removed in Window 4

Safely Valves Not Removed in Window 4

POS 6 of a Drained Maintenance Outage m

0VWIG7 o POS-06 1 1 POS 6 of a Refuelin 1 Outage

VWIG4 P0S-R6 POS-RK)

Pressurizer Pressurizer Safety Valves Sofety Valves Removed In W/R6 Removed in W4R6

PZR-SV-REM0VEDW4 PZR-SV-REM0VEDW4 Reflux Cooling Given RHR3 in Window 4

Reflux Cooling Given o Rrf!3 in Window 4

Failure to Diognose RCS Loops Isolotod Non-recoverobic to Couse Failure L033 ol RHR of Reflux Cooling in Window 4

60-W4 D-R3W4-XHE

Operator Foikre INSLF FLOW TO to Feed SGs in 1 SG FRM AT LEAST Window 4-RHR3 I AFW PUMP Z5 LSW4 SR3V4G3 A-R3W4-XHE-SF-

Operator Foilure FALURE OF FAL TO aOSE FALURE OF Operator foilure to Bleed the SECONDARY SOE BOTH PCRVS SECONDARY SIDE to establish SGs in Window HEAT REMOVAL HEAT REMOVAL reflux after 4 PRT rupture

SSHW4 SSHW4 A-R3W4-XHE-S1-7 A-R3W4-XHE-S2-7 RCS Loops Isolated to Cause Failure of Reflux in Window 4

L00PISO.ATED4D6 SOS-DRAINEO-CSO SGS-DRANED-R LOOPISOUTEOURK) LOOPISOLATE04R6 SGS-DRAINEO-R Feed and Bleed the RCS in RHR3, Window 4

Feed and Bleed the RCS in RHR3, Window 4 I FR:W4

Feed and Bleed Sofety Volve the RCS in RHR3 Removed in Window In Window 4 4

FR3 V40 SV-W4 m ON Foilure to Diagnose Non-recoverable Loss of RHR in Window 4

D-R3W4-XHE

FRB\ '4G2 FRBV4G3

Operator Failure' FALURE OF FEED Operator failure FAILURE OF FEED to use HHSI in AND SPLL USING ot use LHSI in AND SPILL USING feed and spill HPI Feed ond Spill , LPI in Window 4 in Window 4

FSW34H FSW34L A-R3W4-XHE-FH-4 A-R3W4-XHE-a-4 Safety Valves Removed in Window 4

Safety Volve Removed in Window 4

SV--W4

POS 6 of a Drained w Maintenance Outage

SV-V4G00 SV-W4G0 POS-D6

Pressurizer POS 10 of a Pressurizer Safety Valves Refueling Outage Safety Valves Removed in W4R6 Removed in W4R6

P0S-R6 PZR-SV-REM0VEDW4 POS-R10 PZR-SV-REMOVEDW4 Feed and Bleed the RCS with failed in RHR3, Window 4

Feed and Bleed the RCS in RHR3 in Window 4

Failure to Diagnose Non-recoveroble m Loss of RHR I in Window 4

FR3WWG0 D-R3W4-XHE

FR3W WG2 FR3W 1VG3

FALURE OF FEED Operator Failure Operator failure-'' FALURE OF FEED AND SPLL USING to use HHSI in ot use LHSI In AND SPLL USING HPI feed and spill Feed and Spill LPI in Window 4 in Window 4

FSW34H FSW34L A-R3W4-XHE-FH-7 A-R3W4-XHE-FL-7 Gravity from RWST in RHR3, Window 4

Gravity from RWST in RHR3 in Window 4 f 1 m GR: W4 1 Safety Volve Removed in Window 4

L: > A GR3V4G3 SV-W4

1 1 INSUF FLOW Failure to Diagnose Operotor Failure THROUGH LOW HEAD Non-recoverable to establish INJECTION FLOW Loss of RHR gravity feed APATH in Window 4 in window 4 D6-CG n n D-R3W4-XHE A-R0W4-XHE-G-4 Appendix E.4 Event Trees and High Level Fault Trees for Loss of Operation Train of RHR(RHR4)

E-166 UNITY IR4W1 RR4WI VW1 SR4W1 FR4W1 GR4W1 CR4W1 SEQ # END-STATE-NAMES

3 1 OK OK z3 OK 4 CD m 5 CD 6 CD --a 7 OK 8 OK 9 CD 10 CD <&.

R4W1R6 Event Tree UNITY IR4WI RR4W1 FR4W1V CR4W1V SEQ # END-STATE-NAMES

OK OK OK CD mI CD (—4 8

R4W1D6 Event Tree I top event for loss of RHR- R4 in Window 1

E Frequency ColcuVaUon for R*WI II

Frequency of Loss of RW-* during Midloop n tD u

Durotton of Frequency of POS t> of a ProbobiEty ProbobiEty X> of Refueling Refueling Refueling Ouloge of POS X) Given that IE occurs Outage Refuelng Outoge In wl given RK> IT a DURATION-R»

6 of 0 Refueling ProboMity , Duration of frequency of I 'otoed Mofntonence Duration of ProboMity PiS 6 of o Drolned Outage (hat E occurs f DS 6 of Refueling Refueing „ 6 of Drdned ,thot IE occurs >• olntencnco Outage in wl given R6 Ouloge mtenonce Outage In w1 given 06

POS-R6 PROB-WfW PR0B-WO6 Restore RHR given RHR4 in Window

Restore RHR Given RHR4 in Window 1 m o RR< Wl

Failure to Restore Failure to Diagnose Loss of RHR-4 RHR, given RHR4 Non-recoverable Loss POSs 3-13 in Window 1 of Operating Train of RHR in Window 1

W3-S A-R4W1-XHE-R-4 D-R4W1-XHE Safety Vqjves Not Removed in Window 1

Sofely Valves Not Removed in Window 1

V ) n 1 POS 10 of o POS 6 of o Droined Refueling Outoge Maintenance Outoge r^ 0vwIG 7 o POS-R10 P0S-D6 m• »—* I I POS 6 of o Refuelin 1 Outage

vw 1G4 P0S-R6

Pressurizer Sofety Valves Removed in W1R6

PZR-SV-REMOVEOW) Reflux Cooling in Window 1

Roflux Cooling Given a RKR4 in Window 1

Failure to Ofagnose RCS Loops botoled tfon-recoverobte Loss to Cause Foilire of Operating Traiironn of Reflux Cooling )f RhR in Window.

ZI u IS0-W1 D-R4VTI-XHB

INSUF aow TO Cperotor Foilire SG FRM AT LEAST to Feed SGs in I AFW PLM5 Window 1-R4 Z5 Z3 LSW1

A-R5WI-XHE-SF-9

Operotor Foilure FALURE OF FAL TO CLOSE FALURE OF Operato1r failure to Bleed the SECONOARY SIOE BOTH PORVS SECONOARY SGE to estobteh SGs 1 give.i R4 HEAT REMOVAL HEAT REMOVAL reflux ofter PRT rupture

SSHW1 P0RV1 SSHW1

A-R4W1-XBE-31-0 A-R4W1-XHE-32- RCS Loops Isolated to Cause Failure of Reflux in Window 1

RCS Loops Isototed to Cause Failure of Reflux Cooing

ISO-WI m n isov IG6 uISOV WO u

I I • 30S 6 of o Drained NO aCS SIGNAL POS K) of o I OS 6 of o Refueling Maintenance Out ago OPER OR AUTO RefueCng Outage Oulogo TRAIN A Z3 ISOV IG5 ISOV 102 isow ICO POS-D6 POS-RK) P0S-R6

Loops Isolated Secondary Side Secondory Side Loops Isolated Secondory Side in window I of of SGs Oroinod of SCs Drained in of window of SGs Drained 06 in POSs 6 of In POSs 6 or 1 of R» in POSs 6 or Drained Moinlenon 10 or Refueling 10 or Refuelino

L00PIS0LATEDO6 SGS-ORAINED-CSO SGS-DRAINEO-R LOOPISOLATEOKIO LOOPIS0LATE01R6 SGS-DRAINEO-R Feed and Bleed the RCS in RHR4, Window 1

Feed and Heed (ho RCS In RHR4, Window I

Feed ond Bleed Safety Volve the RCS in RHfM, Removed in Window Window 1 I

PR4 O01 sv-wi m

Foilure to Diognose 4^ lon-recoveroble Loss of Operating Train of RW in Window 1

PR4VI02

D-IUW1-X1IB zy PR4V103 FR4V1G4

FALURE OF; FEED, Operator failure FALURE OF FEED Operator Foilure ANO SPLL'USWO ot use LHSI in AND SPLL USING to use HHSI in LPI Feed ond Spill HPI feed ond spill in Window 1 In Window 1

FSW12L FSWI2H

A-R4VT1-XHE-FL-3 A-R4WI-XHE-FH-3 Safety Valves Removed in Window

Safety Valve Removed in Window 1

SV •W1 m POS 10 of a POS 6 of a Drained a Refueling Outage Maintenance Outage

SV- V1G0 P0S-R10 POS-D6

Pressurizer Safety Valves Removed in W1R6

POS-R6 PZR-SV-REM0VEDW1 Feed and Bleed the RCS with V failed in RHR4, Window 1

Feed ond Bleed the RCS in RHR4, Window 1

Foilure to Diagnose Non-recoveroble Losfc of Operating Train m of RHR in Window '

FR4V1VG1 D-R4W1-XHE

FR4V1VG2 FR4V1VG3

OperatoIr Failure FAILURE OF FEED Operator failure FAILURE OF FEED to use HHSI in AND SPLL USING o\ use LHSI in AND SPLL USING feed and. spill HPI Feed acid Spill LPI in Window .1 in Window^ 1

FSW12H FSW12L A-R4W1-XHB-FH-10 A-R4W1-XHB-PL-10 Gravity from RWST in RHR4, Window

Gravity from RWST in RHR4, Window 1

m OR'Wl -a Safety Valve Removed in Window 1

CR4W1G1 SV-W1

Failure to Diagnose Operator Failure INSUF 'FLOW Non-recoverable Loss to establish THROUGH LOW HEAD of Operating Train gravity feed INJECTION FLOW of RHR in Window 1 in window 1 PATH

D6-CG D-R4W1-XHE A-R4-W1-XHE-G-6 Failure of High Pressure Recirculation in Window 1

roliriolHlo.,, ' In Wn*» 1

C»}»1

M Feed and S'^eatn ISMMSA V I with" T.prf L •"*"** ' -J 00

n-uvi-xiii A-iu*i-ara-4-4 j ToV€ to MogioM :oV« ot, RKjf culallo flat Rollers In Loe» of mi Ev»m Bproy (h wndew WWo» I In Win*» 1 In tfndcw t Vent Exl

3M MCO CM n<3i b-ftiwi-xm A-XUHl-XQB-O-4 A-RlWi-IM-C-i D-tttwi-ioa

HPB l« Failure of Recirculation Spray in Window 1-cause HPR failure

Fpilure of Recirculation Spray in Window

PR4W1

loss of HPSH dui! to open contoinment

PR4Y 1G1 CON-VFC-RP-COREM

Operator Failure Failure to Diagnose to Establish f|lon-recoveroble Loss Recirculation of Operating Train Spray in W! jf RHR in Window 1 T

PR4V1G2 A-R4Yfl-XHE-P-4 D-R4W1-XHE

rALURE OF OUTSDE FALURE OF INSIDE | SPRAY RECIRCULATION SPRAY RECIRCUUTION

F2LPSD FtPSD Failure of High Pressure Recirculation in Window 1

Coiliri of Ho. Pr«*re /bereuawn In win** 1

CtUJVIT

HPR 7J

'dV« of R«ftculotlo i F&Steam Eptxy \n Window In Window 1 Kch P BeSra 1 HE RECR IKCE W witth LPLPrFt I •"""*»' I I ' lif WinoV 1 OWN pyw SUCT zp (j A D-Uri-in A-3U1U-XB3-0-4

talir* of.R«frojloffc > mt Fwmcw* In Window 1 In Win*» 1 a a T\ »tn*w I b-fcivi-xm X-IUTT1-XHS-C-4 A.-UV1-XKD-C-I

If Ft to LP» to LCS'H JECR' tOE not ut Uflt Z4f UNITY IR4W2 RR4W2 VW2 SR4W2 FR4W2 GR4W2 CR4W2 SEQ H END-STATE-NAMES

1 OK n 2 OK 3 OK 4 CD 5 CD i 6 CD oo 1 OK 8 OK 9 CD 10 CD m

R4W2R6 Event Tree

I UNITY IR4W2 RR4W2 SR4W2 FR4W2V CR4W2V SEQ # END-STATE-NAMES

OK OK OK OK m CD 00 CD

R4W2D6 Event Tree Top Event for Loss of RHR- R4 in Window 2

l£ Frequency Coleubtion for P.4W2

during MfcJtoop 73

U

Duration of Frequency of POS 10 of o ProbobKty Probability PCS X> of Relucting fafueSng Outog» of POS K> CWM that E oectrs u Outage Refueling Outog« In W2 g>«n RJO u OURMDN-fltO REFUEL POS-RW FRAC-POSW PR08-W2R13

PG> 6 of 0 Refueling Probability Dirollon of Frequency of C -olf»d Maintenance . Duration of Probability Pi S 6 of a Drained Outage trul E occurs R6 of Rftfuel R«fue»ng 'OS 6 of Orotned that E occurs * olntenonce Ouloge In W2 given R6 i onterwnco Outogo in W2 g'ven D6

PR08-W2R6 REFUa DURATI0N-D6 PR0B-W2D6 POS-06 Restore RHR given RHR4 in Window 2

Restore RHR Given RHR4 in Window 2 m RR4 W3 i 1 1 Failure to Restore Failure to Diagnose Loss of RHR 2 RHR, given RHR4 Ion-recoverable Loss POSs 3-13 in Window 2 of Operating Train of RHR in Window 2 y\ o n W3-S A-R4W2-XHE-R-4 D-R4W2-XHE Safety Valves Not Removed in Window 2

Safety Valves Nol Removed in Window 2

W'2

POS 10 of a 30S 6 of o Drained Refueling Outage Maintenance Outage m 00 P0S-D6

P0S-R6

Pressurizer Sofety Valves Removed in W2R6

PZR-SV-REM0VEDW2 Reflux Cooling in Window 2

Redux Cooling Given o RUM in Window 2

Failure to Diagnose ton-recoveroble Loss of Operoting Train n >f RHR in Window 2 D-R4YT2-XHE

wsuf aow TO Operator Failure SG FRM AT LEAST to Feed SGs in 1 AFW PUMP Window 2-R5

LSW23

A-R4W2-XHE-SP-9

Operator Foilure Operolor Foilure to Bleed the to Estobtsh SGs 1 Civen RHR4 Reflux ofter PRT Rupture

SSHW23

A-R4W2-XHE-S1-0 A-RiW2-XHE-S2-0 RCS Loops Isolated to Cause Failure of Reflux in Window 2

RCS Loops Isolated to Cause Failure of Reflux Cooling

ISO -VT2 m 23 n n ISOV 800 ISOV2O00 !S0> 200

1 1 1 30S 6 of o Oroined NO acs SIGNAL POS K> of o IOS 6 of a Refueling Mointenonc© Outoge 0P£R OR AUTO Rofuefng Outogo Outage TRAIN A

1301 203 0 sow;-oio ISOV 802 0 oPOS-D6 oPOS-RK) P.0S-R6 1 ' 1 1 Loops Isoloted Se condory Side Secondary Side Loops Isolated Loops Isolated Secondory Side in Window 2 of of SG3 Drained of SCs Drained in of Window in Window 2 ol of SGs Drained 06 in POSs 6 of In POSs 6 or 2 of RK> R6 In POSs 6 or Drol ned Mointenan X) or Refuelina to or Refuelina

LOOc ATE E 208 SOS-DRAINED-CS D 0 -R 10 O PISOL SGS-DRANEO- L00PIS0LATED2oR L0OPISOLATED2R0 SGS-DRAINED-oR Feed and Bleed the RCS in RHR4, Window 2

Feed and Bleed the RCS in RHR4, Window 2

aPR W3

Feed and Bleed Sofety Volve the RCS in RHR4, Removed in Window Window 2 2

m FR4/201 SV-W2 i oo

Foilure to Diagnose Non-recoveroble Los: of Operating Train of RHR in Window 2

nFR4 1ZGZ

FALURE OF FEED Operator Foilure FAILURE OF FEEO Operotor foilure AND SPLL USING to use HHSI in ANO SPLL USING ot use LHSI in HPI feed ond spill LPI Feed ond Spill in Window 2 in Window 2

FSW12H FSW12L Valves Removed in Window

Sofety Valve Removed in Window 2

SV •W2

POS 10 of o POS 6 of a Drained Refueling Outage Maintenance Outage

SV-W2G0 P0S-R10 POS-D6

POS 6 of a Refuelinc Pressurizer Outage Safety Valves Removed in W2R6

POS-R6 PZR-SV-REM0VEDW2 Feed and Bleed the RCS with V failed in RHR4, Window 2

Feed and Bleed the RCS in RHR4, Window 2

FR4W2V

Failure to Diagnose Non-recoveroble Los; of Operating Train of RHR in Window 7 m

FR4V2VGn 1 D-R4W2-XHE

FR4U2VG2 FR41 '2VG3

FALURE OF FEED Operator Failure Operator failure FAILURE OF FEED AND SPLL USING to use HHSI in o\ use LHSI in AND SPLL USING HPI feed and spill Feed and\.-Spill LPI in Window 2 in Window 'XL:

FSW12H FSW12L A-R4W2-XHE-FH-10 A-R4W2-XHE-FL-10 Gravity from RWST in RHR4, Window 2

Gravity from RWST in RHR4 Window 2 m I J—* nGR4W2

Safety Valve Removed in Window 2

CR41 201 SV-W2

Failure toI Diagnos e Operator Failure INSUF FLOW ion-recoverable Loss to Establish THROUGH LOW HEAD of Operating Train Gravity Feed INJECTION FLOW of RHR in Window 2 in Window 2 PATH

D6-CG

D-R4W2-XHE A-R4W2-XHE-G-6 Failure of High Pressure Recirculation in Window 2

In WWJ» 2

rafwi 1 1 I HPR Bi/t^ Vain* 3J-Ti e "RW;5T &ACQ0T«d & A Q cat raoj SV-WJ CM rata

1 1 : i i 1 " i dlir€ ol.RK/rculotio i Opcrrtof foilir* LPR Sprey In window to Crow Comact LPR 2 TfERECR UCCE WW»»2 m (F& te air ) F&SDIH >-* M A A A rA (^ A C0M FMVft HI FSWI5H CM Ha ram D-fciYI-XU A-IUttt-XBI-C-i tt-mva-lra i-uva-iiii-x 1 1 i i 1 I :oV« of.Rtdftulotlo i foibr* to Dog(«» (fat fttntHi IA arey m wndow LCM or |»ffl tvflrt Y.n* XxliU HMO* 2 In WWw 2 2 HWi P Rearo In Mtfndow 2 for PM4 «id tfpr»r spill TrltA A r ^ A f A r^i A V*2 PM»« CM raw m«x A VEKILU D-tU.W2-.Z01 A-Jum-xni-c-x A-Mira-iHH-c-i D-JUW&-XHH

1 i 1 LTD to If K to Hot U| us gcj MX; A A A A Failure of Recirculation Spray in Window 2-cause HPR failure

I oilura of Recirculate Spray in Window

uPR. W2

loss of HPSH a to open contoinme it IT PR* 1201 CON-VFC-RP-COREM

PR4 f202 0 PR* f2G3

1 1 Operator Failuro Failure to Diagnose Foilure to Diognose Operator Failure FALURE OF FEED to Estoblish Non-recoveroble Los3 Non-recoverdble Loss to Cross Connect AI-0 SPLL USING Recirculation of Operoling Troin of Operating Train IWST Given Successfu HPI Sprov"in W2 of RW in Window 2 of RHR in Window 2 "F" • M A u o FSW12H A-R4W2-XHB-P-* D-R4W2-XHE D-R4W2-XHE A-R4W8-XHE-X

FAILURE OF OUTSDE FAILURE OF INSIDE =PRAY RECIRCULATION .'fePRAY RECIRCUUTION

F2LPS0 FtPSD Failure of High Pressure Recirculation in Window 2

m i UNITY IR4W3 RR4W3 VW3 FR4W3 GR4W3 SEQ g END-STATE-NAMES

OK OK OK CD P CD OK CD

R4W3R6 Event Tree UNITY 1R4W3 RB4W3 VW3 FR4W3 GR4W3 SEQ n END-STATE-NAMES

OK OK OK CD ID CD OK CD

R4W3R10 Event Tree UNITY 1R4W3 RR4W3 SR4W3 FR4W3V SEQ # END-STATE-NAMES

m s t OK OK OK OK m CD ^1

R4W3D6 Event Tree 1 m I top event for loss of RHR-4 in window 3

£ Frequency ColculoUon for R4W3

Lois" "of Rtfl-« during Midloop ZJ m 00

Duration of Frequency of POS t> of o PrcbabiSty Probobifily « tt ol Refueling Refueling Refueling Ouloge of POS » Gtven that IE occurs Ouloge Refueling Oirtoge In w3 given RIO

0WWTK3N-RD REFUEL POS-ftK) PROB-WJRO

PCS 6 of o Refueling ProbobiMy OuroUon of Frequency of C -oined Mo'mtonence Duration of Probobifity Pi 5 6 of o Droined Outage that E occurs R§ of Refuel Refueling. fOS 6 of Droned ,*bat E occurs K atntenonce Ouloge in w3 given R6 * ointenonce Ouloge tn w3 given D6

DR-MT DURATON-06 PR08-W3D6 m

?•$-. Restore RHR given RHR4 in Window 3

Restore RHR Given RHR4 in window 3

m RR4 W3 1 1 Failure to Restore Failure to Diagnose Loss of RHR-4 RHR, given RHR4 Ion-recoverable Loss POSs 3-13 in Window 3 of Operating Train of RHR in Window 3 A o n W3-S A-R4W3-XHE-R-4 D-R4W3-XHE

I Safety Valves Not Removed in Window 3

Safety Valves Not Removed in Window 3

o

VWSG1 P0S-R10

Pressurizer Pressurizer Safety Valves Safety Valves Removed in W3R6 Removed in W3R6

PZR-SV-REM0VEDW3 PZR-SV-REMOVEDW3 Reflux Cooling in Window 3

Reflux Cooling Given o RH?4 in Window 3

Failure to Diagnose RCS Loop1s Isolated Non-recoverblo Loss to Cause Foiluro of Operating Tra'n of Reflux Cooling >f RhR in Window 3

SR4"301 u 60-W3 D-R4W3-XHE N> O

t INSUF FLOW TO ! SG FRM AT LEAST I AFW PUMP

ZT r LSW23 3R41 3G4 A-R4W3-X1IB-SF-8

Operator Foilure FALURE OF SGS FAL TO CLOSE FALURE OF SGS to Bleed the STEAM PATH TO BOTH PORVS STEAM PATH TO SGs given R4 vlAIN STEAM HHAOER vWIN STEAM HEADER

SSHW23 PORVI SSHW23 A-R4W3-XHB-S1-8 A-R4W3-XHB-82 RCS Loops Isolated to Cause Failure of Reflux in Window 3

i to 8

SCS-DRAIN£D-CSD LOOPISOLATE0306 L00PISOATED3RK) SGS-DRANED-ft LOCPIS0LATED3R6 SGS-DRAINEO-R Feed and Bleed the RCS in RHR5, Window 3

Feed ond Bleed Ihe RCS in Rrt*5, Window 3

nPR. W3

Feed ond Bleed Sofety Volve the RCS in RHR5. Removed in Window Window 3 3

FR4' f3Gl SV-W3

Foilure to Diagnose Non-recoverable Loss o of Operating Train of RHR in Window 3

D-R4W3-XHE

(J PR4'f303

Operator Foilure FAILURE OF FEED FALURE OF FEED Operator foilure to use; HHSI ,in AND SPILL USING AND SPLL USN5 ot use LHSI in feed And spin LPI • ^ Feed and Spill in Window 3 in Window 3

FSW34H FSW34L A-R4W3-XHB-FH-4 A-R41V3-XHE-FL-4 fety Valves Removed in Window

Safety Valve Removea in Window 3

SV-W3

POS S of a Drained Maintenance Outage

SV-V3G00 SV-W3G0 POS-D6

Pressurizer POS 10 of o Pressurizer Sofety Valves Refueling Outage Sofety Valves Removed in W3R6 Removed in W3R6

P0S-R6 PZR-SV-REM0VEDW3 POS-RIO PZR-SV-REM0VEDW3 Feed and Bleed the RCS with V failed in RHR4, Window 3

Feed and Bleed the RCS in RHR4, Window 3

Failure lo Oiognose Non-recoveroble Los: of Operating Train of RHR in Window 3 m i IT to o ?M\ 3VC1 D-R4W3-XHE

FIMV 3VQ2 jy PR4t 3V03

Operotor Failure . FALURE OF FEED Operator failure x FAILURE OF FEEO to use HHSI in AND SPLL USING ot use LHSI in AND SPLL USING feed and spill HPI Feed and Spill LPI in Window 3 In Window 3

FSW34H FSW34L A-R4W3-XHE-PH-8 A-R4W3-XHE-PL-8 Gravity from RWST in RHR4, Window 3

Gravity from RWST in RHR4, Window 3 m i O GR

Sofety Volve Removed in Window 3

CB4V 3G1 SV-W3

INSUF FLOW Foilure to Diagnose Operator Failure THROUGH LOW HEAD ton-recoverable Loss to establish INJECTION FLOW of Operating Train gravity feed PATH Df RHR in Window 3 in window 3

D6-CG D-R4W3-XHE A-R4HY3-XHE-G-5 UNITY IR4W4 RR4W4 VW4 FR4W4 GR4W4 SEQ # END-STATE-NAMES

OK OK OK OK CD OK -4 CD

JW

R4W4R6 Event Tree UNITY IR4W4 RR4W4 VW4 FR4W4 GR4W4 SEQ It END-STATE-NAMES

OK OK OK OK m CD OK O 00 CD

R4W4R10 Event Tree UNITY IR4W4 RR4W4 SR4W4 FR4W4V SEQ a END-STATE-NAMES

OK OK OK OK m CD o

R4W4D6 Event Tree I top event for loss of RHR-4 in window 4

E Freojoncy CdcUotion for gR4W4 l"" Frequency of Lws of Rffi-4 during Mid-Loop 0 IR4«4Gl oFRBq-RHRi 0 IR« r)02

1 1 1 1 Ourot'wn of frequency of POS O of 0 Probobilly ProbobWy POS t> of Refuefin Refuefing Refueling Outage ol POS 10 Given that C occurs Outoga Rehiring Outogo in W4 gwen RIO L IR4 uos g c3 Q Q IR4TUG4 OCRATON-RoO o fRAC-POStt PROB-W4RB Rtfua PO; -RD 1 1 1 1 1 1 Dixotion of frequency of POS 6 of o RafoeKf 3 Prcbobffly Ordned Mo'ntanence DirolSon of Probability POS 6 of o drone R$ of Refuel Refueling Out 094 thot C occurs POS 6 of Droned that E occurs Maintenance Outage In W4 oven R6 Maintenance. Outoge in W4 given 06 3 O K3N-H6 O c Dfi-MT oREFLQ. oPROB-W4D6 o DORA '•POS-A6 c-W4R $ c DUv\TCN-06 POS-06 PROS & Restore RHR given RHR4 in Window 4 i?"'

Restore RHR Given RHR4 in Window 4

RR-SW4

Failure to Restore Failure to Diagnose Loss of RHR RHR. given RHR4 Non-recoveroble Loss POSs 3-13 in Window 4 of Operating Train of RHR in Window 4

W3-S A-R4W4-XHE-R-5 D-R4W4-XHE Safety Valves Not Removed in Window 4

m i . bo to

VWIG4 VW4G1 P0S-R6 POS-RK)

Pressurizer Pressurizer Safety Valves Safety Valves Removed in \V4R6 Removed in W4R6

PZR-SV-REMOVEDW4 PZR-SV-REMOVEDW4 Reflux Cooling in Window 4

Reflux Cooling Given o RHR4 In Window 4

Foikjre lo Diognose RCS Loops Isolated Jon-recoveroble Loss to Couse FoiVjre of Operating Troin of Reflux Cooling >f RhR in Window 4

S0-W4 D-R4VT4-XHE

Operotor FoiVe NSUF aow TO lo Feed SGs in I SG FRM AT LEAST Window 4-RHR4 I AFW PUMP

LSW4 SR4V4Q4 A-R4W4-XHB-SP-8

Operator Foilure FALURE OF FAL TO aOSE FALURE OF to Bleed the SECONDARY SOE BOTH PORVS SECONDARY SIDE SGs in Window HEAT REMOVAL HEAT REMOVAL 4

SSHW4 PORVI SSHW4 A-R4W4-XHB-31-8 A-R4W4-XHE-S2-I RCS Loops Isolated to Cause Failure of Reflux in Window 4

RCS Loops Isolated to Couse Fdlure of Reflux Coofng

ISO- W4 D ISOVi iC6 60U4G0 nISOW (C8

=05 6 of o Ooined NO aCS SIGNAL POS 10 ol o I OS 6 of o Refueling Maintenance Outoge OPER OR AUTO RefueEng Outoge Outogo TRAIN A

ISOWtC5 "5 ISOW IG10 POS-06 POS-RIO ISOW 4C2 P0S-R6

Loops Isolated Secondory Side Secondory Side Loops Isolated Loops Isololed Secondory Side in window 4 of of SGs Groined of SGs Drainod in of window in window 4 of of SGs Ooined 06 in POSs 6 ol in POSs 6 or 4 of RIO R6 in POSs 6 or Droined Mointenon 10 or Refueling 10 or Refuelino

LOOPIS0LATED4D6 SGS-DRAINED-CSO SGS-DRAMED-R L00PISCLATEfJ4RK) LOOPISOLATED4R6 SCS-DRAINEO-R Feed and Bleed the RCS in RHR4, Window 4

Feed and Bleed the RCS in RHR4, Window 4

uPR W4

Feed an£d Bleed Safety Volve the RCS in RHR4, Removed in Window Window 4 4

FR4 lf4Cl SV-W4

Failure to Diagnose Non-recoverable Los: W of Operating Train i of RHR in Window 4 Is)

Operator Failure FALURE OF FEED Operator failure FAILURE OF FEED to use HHSI In AND SPLL USING ot use LHSI In AND SPILL USING feed and spill HPI Feed and Spill LPI in Window 4 In Window 4

FSW34H FSW34L A-R4W4-XHE-PH-3 A-R4W4-XHE-PL-3 Safety Valves Removed in Window

Safety Valve Removed in Window 4

SV-W4

POS 6 of a Drained Maintenance Outage

"^

SV-V4G00 SV-W4G0 POS-D6

Pressurizer POS 10 of a Pressurizer Safety Valves Refueling Outage Safety Valves Removed in W4R6 Removed in W4R6

POS-R6 PZR-SV-REMOVEDW4 POS-R10 PZR-SV-REMOVEDW4 Feed and Bleed the RCS with V failed in RHR4, Window 4

Feed and Bleed the RCS in RHR4, Window 4

Failure to Diagnose (on-recoverable Loss of Operating Train )f RHR in Window 4

r to FR4nW ,VG1 D-R4W4-XHE

FR4W V02 FR4W. VG3

FALURE OF FEED Operator Failure Operator failure FALURE OF FEED AND SPLL USING to use HHSI in ot use LHSI in. AND SPLL USING HPI feed and spill Feed and Spill •. LPI In Window 4 in Window_Ay'

FSW34H FSW34L

A-R4W4-XHE-FH-8 A-R4W4-XHE-FL-8 Gravity from RWST in RHR4, Window 4

Gravity from RWST in RHR4, Window 4

GR4W4

Safety Valve Removed in Window 4

CR4V4G1 SV-W4

INSUF FLOW Failure to Diagnose Operator Failure THROUGH LOW HEAD Ion-recoverable Loss to establish INJECTION FLOW of Operating Train grovity feed PATH >f RHR in Window 4 in window 4

06-CG D-R4W4-XHE A-R4W4-XHE-G-5 Appendix E.5 Event Trees and High Level Fault Trees for Recoverable Loss of RHR (RHR5)

E-219

&/%%:••• m:^-&$£@z UNITY IR5WI RR5W1 VWI SR5W1 FR5W1 GR5W1 CR5W1 SEQ n END-STATE-NAMES

1 OK 2 OK 3 OK •1 CD m 5 CD to 6 CD to 7 OK 8 OK o 9 CD 10 CD

R5W1R6 Event Tree UNITY IR5W1 RRSWl FR5W1 GR5W1 CR5W1 SEQ g END-STATE-NAMES

OK OK OK CD CD to

R5W1D6 Event Tree top event for loss of RHR- R5 in Window 1

£ Frequency Colcutotion (or R5W1

Frequency of Recoverobta Lois of RW zi m LJ

Duration of Frequenci y of POS t> of o Probability flrebobJSly X> of Refueling Refueling Refueling Ouloge of POS 10 Given that IE occurs Outoge Refueling Outoge In wl given RIO u POS-ftlO FRAC-POSJ0

PCS 6 of a Refueling Probability . Durotion of Frequency of [ otaed Mointonence Otrotlon o( Probability PcS 6 o( o Drolned Outage that E occurs F DS 6 of Refueling Refueling fOS 6 of Drdned thot IE occurs y aintenartce Outoge in wl given R6 Outogo h aintenonce Outoge in Wl given 06 ~r ~r

0URATION-R6 OURATCN-06 Restore RHR given RHR5 in Window

Restore RHR Given RHR5 a in Window 1

to to RR!iW1

Failure to Restore Failure to Diagnose Loss of RHR 3i RHR, given RHR5 Recoveroble Loss of POSs 3-13 in Window 1 RHR in Window 1

W3-S

A-R5W1-XHE-R-4 D-R5W1-XHE q?A Safety Valves Not Removed in Window

Safety Valves Not Removed in Window 1

VIM

POS 10 of o POS 6 of o Drained Refueling Outage Maintenance Outage

VW 1G7 m POS-R10 POS-D6 i

POS 6 of a Refueling Outage

VVi 1G4 P0S-R6

Pressurizer Safety Valves Removed in W1R6

PZR-SV-REM0VEDW1 Reflux Cooling Given RHR5 in Window 1

Reflux Cooling Given o RHR5 in Window t

Foilure to Diognose RCS Loops taoloted tocoverobld Loss of I to Couao Foilure RHR in Window 1 of Reflux Cooling

SR5U 1G13 IS0-W1

D-R5W1-XHE

INSIF aow TO Operolor Failure SG FRM AT LEAST to Feed SGs in I AFW PLM3 Window 1-R5

LSW1

A-R5W1-XHE-SF-9

Operotor Failure FALURE Cf FAL TO aOSE FALURE Cf Operolor failure to Bleed the SECONDARY SIOE 80TH PORVS SECONDARY SOE to estobGsh SGs 1 given R5 HEAT REMOVAL HEAT REMOVAL reflux ofter PRT rupture

SSHW1 P0RV1 SSHW1

A-R5W1-XHE-S1-9 A-R5WI-XHE-S2-9 RCS Loops Isolated to Cause Failure of Reflux in Window 1

to Os

L00PlSOATEDt)6 SCS-DRAINEO-CSD SGS-DRANEO-R LOOPISOLATCdlRIO LO0PIS0LATEOtR6 SGS-CRAINED-R Feed and Bleed the RCS in RHR5, Window 1

Feed ond Bleed the RCS in RHR5. Window t

FR!W1

Feed anrd Bleed Safety Volve the RCS In RKR5 Removed In Window In Window I 1

"5 SV-Wt FR5YK)

Foikro to Diagnose Recoveroble Loss of RHR In Window I

FR5VX3a0 D-RSW1-XHE

FRS K2

FALURE OF FEED Operolor Foiluro AND SPLL USING to use HHSI In HPI feed ond spill in Window I

FSWI2L FSW12H A-R5WI-XHE-R-5 A-R5WI-XHE-FH-5 Safety Valves Removed in Window

Safety Valve Removed In Window 1

SV-W1

N5 POS 10 of a POS 6 of a Drained 00 Refueling Outage Maintenance Outage

SV-V1G0 P0S-R10 P0S-D6

POS 6 of a Refuelinc Pressurizer Outage Safety Valves Removed in W1R6

P0S-R6 PZR-SV-REMOVEDWl Feed and Bleed the RCS with V failed in RHR5, Window 1

Feed ond Bleed the RCS in RHR5 in Window 1

Failure to Diognose Reooveroble Loss of RHR in Window 1 to

FR5VWG0 D-R5W1-XHE

FR5VWG2 FR5VWG3

Operator Failure FALURE OF FEED Operator failure FAILURE OF FEED to use HHSI in AND SPLL USING o\ use LHSI in AND SPIX USING feed and spill HPI Feed and^Spill LPI in Wind&w. '1,'

FSWI2H FSW12L A-R5W1-XHE-FH-I0 A-R5W1-XHE-FL-10 Gravity from RWST in RHR5, Window

Gravity from RWST in RHR5 in Window 1

m GR!>W1 O Safety Valve Removed in Window 1

GR5WX52 SV-W1

Failure to Diagnose Operator Failure INSUF'FLOW Recoverable Loss of to esloblish THROUGH LOW HEAD RHR in Window 1 gravity feed INJECTION FLOW in window 1 PATH

D6-CG D-R5W1-XHE A-R5W1-XHE-G-6 Failure of High Pressure Recirculation in Window 1

. Fbfcrii ol (fat) FVMILT* JtteVcun In Whfew 1

HPR ZJ ^

d sfe SJ^h'^SS^ f ^ LPR Fee d an earn Umin W!nd!«r » 1 TtEIECR UCtE a T.PR ctvra MP svcr fFASpllz O o A-BMl-XHC-O-l D-IBW1-XHB

,:oQut (fat J&TTBtt* Ift LAM Of. rati tVtnt E2TAS°ffiS3 *«VM !earo fent Exls WMov | In WindM 1 In Wn*w 1 U-] ffB D D Q-Btnri-zna A-BAlU-XHE-C-l A-SBWt-XHB-O-* a

2\ ZI Failure of Recirculation Spray i'n Window 1-cause HPR failure for RHR5 Event

oilure of Recirculation Sprany in Windo w PR!W1

loss of HPSH dui to open containment to

PR5 VIO CON-VFC-RP-COREM

Operator Failure Failure to1 Diagnos e to Establish Recoverable Loss of Recirculation RHR in Window 1 Spray in W1

PR5V1G0 A-R5W1-XHE-P-4 D-R5W1-XHE

rALURE OF OUTSOE FALURE OF INSIDE SPRAY RECIRCULATION SPRAY RECIRCULATION

F2LPSD FI.PSD Failure of High Pressure Recirculation in Window 1

FoOuiol Kt

HPR Z3"

iV« ofRfrfrojWio > F&Sleam DM Of PW LV»nt Eprey RI wtnoov In Wffitow 1 ctww pyvp SHOT DCIECR 1KCS F&Spitl with, LPF to?? i\r i f K. T~.PT tfl &1 ^5™ PWWl (J A-MW1-XHE-C-I "I— "dHr« of.R«frwlallo i fht FMrtW* lA COM of fHttwIrt Eprey h VrtrnJow In Wtrxfew 1 .wre WiftfOW f » 1 If 1 a a o A-Ravi-xwe-e-n X-68ffL-JBB-0-O D-BBtfl-XHB

L?H la LP* to not Ls| not L*t WS BECB M36 UNITY IR5W2 RR5W2 VW2 SR5W2 FR5W2 GR5W2 CR5W2 SEQ # END-STATE-NAMES

1 OK 2 OK 3 OK 4 CD 5 CD I 6 CD 7 OK 8 OK 9 CD 10 CD

R5W2R6 Event Tree UNITY IR5W2 RR5W2 SR5W2 FR5W2V CR5W2V SEQ § END-STATE-NAMES

I

OK OK OK OK CD m CD tio w fcs R5W2D6 Event Tree i Top Event for Loss of RHR- R5 in Window 2

IE Frequency Colculation for RSW2

RSW2

Frequency of RecoveroNo LOM ol RHR (T ^? \ / R5W 02

IT

Ourotfon of Frequency of PCS W of o ProoobKty Probobtfty PCS X) of RefueKng Refueling Refusing Outage of POS t) Cwen (hot E occurs Outage Refueling Outoge in wt gfven RIO

!5W 03 \ / R5W 04 POS-RJO

PC J 6 of a Refueling Probobllty Durotton of Frequency of C -olned Molntonenee Duration of FroboMty PI'S 6 of o Crdned Out*}* Uiot E occurs R6 of Refuel Refitting OS 6 of Oroined that E occurs t- olntenance Outers In W2 given RS & oinlenance Outoge In W2 given D6

REFUa PR0B-W2D6 Restore RHR given RHR5 in Window 2

Restore RHR Given RHR5 in Window 2

RRI W2 mi to 1 1 Foilure to Restore Foilure to Diognose Loss of RHR RHR, given RHR5 Recoveroble Loss of POSs 3-13 in Window 2 RHR in Window 2 *3 A A o W3-S A-R5W2-XHE-R-4 D-R5W2-XHE Safety Valves Not Removed in Window 2

Sofety Volves Not Removed in Window 2

W'2

POS 10 of o 30S 6 of o Drained Refueling Outage Maintenance Outage m n 00 vw;o7 POS-R10 P0S-D6

FOS 6 of o Refueling Outage

vw; 04 P0S-R6

Pressurizer Safety Volves Removed in W2R6

PZR-SV-REM0VEDW2 Reflux Cooling Given RHR5 in Window 2

Reflux Cooling Given o RH35 In Window 2

Foikjre to Diagnose RCS Loops Isolated Recoveroble Loss of to Cause Failure RHR In Window 2 of Reflux Cooling I "5 SR5W !C0O BO-W2 SR5W 2G13 0-R5W2-XHE

INSUF FLOW TO Operator Foilure ! SG FRM AT LEAST to Feed SGs In I AFW PUMP Window 2-R5

LSW23 SR5V 2G3 SR5V 2G11 A-R5W2-XHE-SF-9

Operator Foilure FALURE OF SGS FAL TO aOSE FALURE OF SGS Operotor Foilure to Bleed the STEAM PATH TO BOTH PORVS STEAM PATH TO to Establish SGs 1 Given R5 MIN STEAM HEADER MAJIN STEAM HEADER Reflux ofter PRT Rupture

SSIW23 PORVt SSHW23 A-R5W2-XHE-S1-9 A-R5W2-XHE-S2-9 RCS Loops Isolated to Cause Failure of Reflux in Window 2

o

LOOPISOLATED2D6 SGS-DRAINED-CSD SGS-ORANEO-R LOOPISOLATflDSRIO tOOPISOLATEDSnO SCS-DRAINEO-R Feed and Bleed the RCS in RHR5, Window 2

Feed ond Bleed the RCS in RHR5, nWindow 2 FR: .W2

Feed ond Bleed Safety Volve the RCS in RHR5 Removed in Window in Window 2 2

FR5V20 SV-W2

m Foilure t1o Oiognose Recoveroble Loss of RHR in Window 2

FR5V2GO D-R5W2-XHE

FR5\ '2G2 "5" FR5V '2G3

FALURE OF FEED Operator Failure FALURE OF FEEtJ A Operator foilure AND SPLL USING to use HHSI in AND SPU USING ot use LHSI in HPI feed and spill LPI Feed ond Spill in Window 2 in Window 2

FSW12H FSW12L A-R5W2-XHE-FH-5 A-R5W2-XHE-FL-5 Safety Valves Removed in Window 2

Safety Volve Removed in Window 2

SV W2 6. POS 10 of a POS 6 of o Drained Refueling Outage Maintenance Outage

SV-W2G0 POS-R10 POS-D6

POS 6 of o Refuelinc Pressurizer Outage Safety Valves Removed in W2R6

P0S-R6 PZR-SV-REMOVEDW2 Feed and Bleed the RCS with V failed in RHR5, Window 2

Feed and Bleed the RCS in RHR5 in Window 2

Failure to Diagnose Recoveroble Loss of RHR in Window 2 rn FR5V 2VG0 D-R5W2-XHE

FR5V 2VG2 FR5V 2VG3

FALURE OF FEED Operotor Failure Operotor foilure FAILURE OF FEED AND SPILL USING to use HHSI in ot use LHSI in AND SPILL USING HPI feed and spill Feed an<}.- -Spill LPI in Window 2 in Winddw\2

FSWI2H FSW12L A-R5W2-XHE-FH-10 A-R5W2-XHE-a-K) Gravity from RWST in RHR5, Window 2

Gravity from RWST in RHR5 in Window 2

GRJW2

Safety Valve Removed in Window I 2

GR5W2G1 SV-W2

Failure to Diagnose Operotor Failure INSUF FLOW Recoverable Loss of to Establish THROUGH LOW HEAD RHR in Window 2 Gravity Feed INJECTION FLOW in Window 2 PATH

zD6-C. G D-R5W2-XHE A-R5W2-XHE-G-6 Failure of Recirculation Spray in Window 2-cause HPR failure for RHR5 Event

allure of Recircutalior Sproy in Window 2

aPR! W2

loss of HPSH dt e to open contoinme it

PR5\ !2G1 CON-VFC-RP-COREM

PR5V 2G2 PR5V 2G3

Operotor Foilure Foilure to Diognose Failure to Diognose Operotor Failure FALURE OF FEED to Estoblish Recoverable Loss of Recoverable Loss of to Cross Connect Al-O SPLL USING Recirculation RHR in Window 2 RrR in Window 2 iWST Given Successfu HPI Sproy in W2 "F" Q PR5V 2G4 FSW12H A-R5W2-XI-C-P-4 D-R5W2-XHE D-R5W2-XHE A-R5W2-XHE-X

FAILLRE OF OUTSIDE FAILURE OF INSOE FRAY RECIRCULATION 5PRAY RECIRCULATION

F2LPS0 F1PS0 Failure of High Pressure Recirculation in Window 2

FoBui ol Klob. TnHMj. 2

c__«)r__r 1 1 HPR X-Tie RWSTs

otsi 7.C3

1 1 1 1 1 1 r tfltM of Rfcfrculortlo i 0p _0pwcit6f Fotor _• LPR LOM of rafl EV*M forty (n window Ll?R m Jjla.fi$" WAS* ts Croei Comeet 1ft tfndmr 2 2 TIE FECR IKCE Wu 1 WST QK*n &woe wft 1 IPI (F& Steam ) * (F&SpM.) r~\ A A A r ^ ( ^ A CR51 P»W* HI H5 FSWBH ati avci D-BBwa-xm A-WWa-XUB-OHB D-DSTnt-xKc i-ttmn-xst-x 1 i 1 i : 1 1 Srfojy V{_M» dkr« of.R«frcuWte foilffi loKoomio Mat fwriew in Lou of ml Evtm ferey In Window Lc*» of FHR tvanl Y*nt xxtitt WWow 2 2 Bprv W^7 Hh Wn*w I ftr FMd and A A. A n n A ( \ X VW2 PMiri O\^_^/ rati CTO» raw mat pe&witr VE-m.15 D-ttswa-xm A-Mira-XHB-C-* A-nswa-iHB-c-a D-ftfiwa-ira

1 1 _____ 1 urn ia ITS

C3tpt2

HPR X-Tle RWST tJ IT

LPR '0W«5S^ !M»fiH8" LPR (F& teanrj In Wmijn 2 OWN BflP SlCT 1l£ HJCR UXE Winfew 2 m ZJ F*fiPtU o-ftswa-xm A-JM*«-SSS-0-4 I>-fi8W-IH(JC T1-B0W2-3O3I-J I

: 4 ^.MS£? ridblW" [STAPHS V*a\ XxliU WWow 2 for Pud Mid fiviL,- _ffi nn Wn4w 2 gym with D • few 2 "2T tj-ftswa-xm A-ftema-iQa-c-4 A-Rfiffa-na-o-t D-SATt-IOB

If ftt o not Ut LCS KCR MX 2^ UNITY IR5W3 RR5W3 VW3 FR5W3 GR5W3 SEQ n END-STATE-NAMES

OK OK OK CD • CD OK CD

R5W3R6 Event Tree UNITY IR5W3 RR5W3 VW3 FR5W3 GR5W3 SEQ # END-STATE-NAMES

&

>'.!

OK OK OK CD CD m OK CD

R5W3R10 Event Tree UNITY IR5W3 RR5W3 SR5W3 FR5W3V

tfl

R5W3D6 Event Tree Top Event for Loss of RHR- R5 in Window 3

E frequency Colciiotlon for R5W3

Frequency of Recoverobte Loss of RH*

\ / IHSW101 u

Duration of frequency of POS 10 of o ProbcbiUy Probobifity 10 of Refueling Refueling RefueSng Outoge of POS 10 Owen that E occurs Outage Refueling Outoge In w3 given RJO

u REFUEL fRAC-POSW CJ

P0> 6 of a Refueling Probobiity Ourotlon of frequency of C olned Moinlonence Ourotlon of ProbcbSity fMS 6 of a Crctoed Outoge thot rE .occur* R6 of Refuel Refuting fOS 6 of Orolned that E occurs V olntenonce Outoge in w3 given R6 • V omleoonce Outoge in w3 given D6

P0S-R6 PR03-W3R6 DURANON-D6 PROB-W306 Restore RHR given RHR5 in Window 3

Restore RHR Given RHR5 in Window 3

(T) RR! W3 1 1 Failure to Restore Failure to Diagnose Loss of RHR-5 RHR, given RHR5 Recoverable Loss of POSs 3-13 in window 3 RHR in Window 3 r^ /\ o W3-S A-R5W3-XHE-R-4 D-R5W3-XHE Safety Valves Not Removed in Window 3

Safety Valves Not Removed in Window 3

30S 6 of a Drained Maintenance Outage

m nvw; GO

POS 10 of o Refueling Outage

VWSC1 P0S-R6 P0S-R10

Pressurizer Pressurizer Safety Valves Safety Valves Removed in W3R6 Removed in W3R6

PZR-SV-REM0VEDW3 PZR-SV-REM0VEDW3 Reflux Cooling Given RHR5 in Window 3

Reflux Cooling Given o RW5 in Window 3

Failure to Diognose RCS Loops Isolated Recoverable Loss of to Couse Foilure RHR in Window 3 of Reflux Cooling "\

ZJ 3R5V30S S0-W3 tn D-R5W3-XHB

t INSUF ROW TO Operator Failure ! SG FRM AT LEAST to Feed SGs in 1 AFW PUMP Window 3 U LSW23 SRS1 '3G4 A-R5W3-XHB-SF-8

Operator Foilure FALURE OF SGS FM. TO CLOSE FALURE OF SGS Operator failuro to Bleed the STEAM PATH TO BOTH PORVS STEAM PATH TO to establish SGs given R5 JAIN STEAM HEADER MN STEAM HEADER reflux after PRT rupture

SSHW23 PORVt SSHW23 A-R5W3-XHE-Sl-e A-R5W3-XIIB-S2-8 RCS Loops Isolated to Cause Failure of Reflux in Window 3

E-2 5 ISO0W 506

•~n 1 1 30S 6 of o Orointd NO acs sioiw. Mointenonco Outogo OPER OR AUTO TRAIN A 5 POS-D6 IS0W1G5

Secondory Side Secondory Side ol SCs Groined ol SGs Dramod in POSs 6 ol in POSs 6 or Oroined Mointenon W or Refueling

SGS-DRAINEO-CSO LOOPIS(XATE03O6 LOOPISaATEOJRW SGS-ORAWEO-R LOOPISOUTED3R6 SCS-DRAINED-R Feed and Bleed the RCS in RHR5, Window 3

Feed ond Bleed Ihe RCS in RHR5, Window 3

aPR >W3

Feed ond Bleed Safety Votve the RCS in RHR5, Removed in Window Window 3 3

FR5 r3Gl SV-W3

PI Failure to Diagnose Recoveroble Loss of Rl-ft in Window 3 u FR5V3G2 D-R5W3-XHE

o ZJ

Operator Failure FAILURE OF FEED FALURE OF FEED Operator foilure to use,' HHSI.in AND SPILL USING AND SPLL USjNb Ot use LHSI in feed and'spil Feed and Spill in Window 3 m in Window 3

FSW34H FSW34L A-R5W3-XHB-FH-4 A-R5W3-XHE-FL-4 Safety Valves Removed in Window 3

Safety Valve Removed in Window 3

SV-W3 m POS 6 of a Drained 6? Maintenance Outage n SV-V '3G00 SV-W3G0 POS-D6

Pressurizer POS 10 of a Pressurize1 r Sofety Valves Refueling Outage Sofety Valves Removed in W3R6 Removed in W3R6

P0S-R6 PZR-SV-REM0VEDW3 P0S-R10 PZR-SV-REMOVEDW3 d and Bleed the RCS with V failed RHR5, Window 3

Feed and Bleed the RCS in RHR5 in Window 3

Failure to Diognose Recoverable Loss of RHR in Window 3 IT FR5V 3VG1 D-R5W3-XHE

0 FR5V3VQ3 FR5V 3V02

Operator Failure FALURE OF FEED Operator failure FAILURE OF FEED to use HHSI in AND SPLL USING ot use LHSI in AND SPLL USING feed and spill HPI Feed and Spill LPI in Window 3 in Window 3

FSW34H FSW34L

A-R5W3-XHE-FH-8 A-R5W3-XHE-PL-8 Gravity from RWST in RHR5, Window 3

Gravity from RWST in RHR5 in Window 3

nGReW3

Safety Valve Removed in Window 3

OR5V 3G1 SV-W3

INSUF FLOW Failure to Diagnose Operator Failure THROUGH LOW HEAD Recoveroble Loss of to establish INJECTION FLOW RHR in Window 3 gravity feed PATH in window 3

06-CG

D-R5W3-XHE A-R*W3-XHE-G-5 UNITY IR5W4 RR5W4 VW4 FR5W4 GR5W4 SEQ a END-STATE-NAMES

OK OK OK OK CD OK CD

R5W4R6 Event Tree UNITY IH5W4 RR3W4 VW4 FR5W4 GR5W4 SEQ g END-STATE-NAMES

OK OK OK OK CD OK CD

R5W4R10 Event Tree UNITY W5W4 RR5W4 SR5W4 FR5W4V SEQ % END-STATE-NAMES

OK OK OK OK CD

R5W4D6 Event Tree I Top Event for Loss of RHR-5 in Window 4

E Froajency CtfeUgttei for IT

Frequency of RecovwoHn aLOSS Of^ RH1 -a U

(Xjrotwn of Frequency of POS » of o Probrtilty ProbobMy POS O of Refucfol Retuenng Refucfing. Outcoe of POS 10 G>*n thai £ occirs n Outoge Refuting Outage In W4 gK-en RIO a

Dilation of Frequency of POS 6 of o Refuel ProboMty Dra'ned Ma'nlonence] Otrotion of PrcbabiGty p POS 6 of o Cra'ne. R6 of R«fuel Refueling Ouloge thot E occurs POS 6 of Drdwd , ttwt £ ocoxs In VM onien Re Mdntononco Outogel in VM given D6 Restore RHR given RHR5 in Window 4

Restore RHR Given RHR5 in Window 4 m

RR! W4 1 1 Failure to Restore Failure to Diagnose Loss of RHR RHR, given RHR5 Recoverable Loss of POSs 3-13 in window 4 RHR in Window 4

/\ o n W3-S A-R5W4-XHE-R-5 D-R5W4-XHE Safety Valves Not Removed in Window 4

Safety Valves Not Removed in Window 4 0 1 V\jf4 POS 6 of o Oroinec Maintenance Outage to ^ VW.G7 o 0wnGO P0S-D6 1 1 _____ POS 6 of a Refuelin 1 POS 10 of a Outage Refueling Outoge

vw »G4 • VWW1 o cS-R1 0 P0S-R6 PO

Pressurizer Pressurizer Safety Valves Safety Valves Removed in W4R6 Removed in W4R6 ( •. •' c3 c3 PZR-SV- 3EMOVEDW4 PZR-SV- REM0VEDW4 Reflux Cooling Given RHR5 in Window 4

Redux Cooling Given o RHR5 in Window 4

Foilure lo Diagnose RCS Loops Isololed Recoverdblo Loss of to Cause Failure RHR tn Window 4 of Reflux Cooling ZJ u S0-W4 D-R5W4-XHE

Operator Foilure INSUF ROW TO to Feed SGs In I SG FRM AT LEAST Window 4-RHR5 I AFW PUMP ZJ ~n LSW4 A-R5VT4-XHE-SP-8

Operator Foilure FAUURE OF FAL TO aOSE FALURE OF Operator failure to Bleed the SECONDARY SOE 80TH PORVS SECONDARY SBE to estoblish SGs in Window HEAT REMOVAL HEAT REMOVAL reflux after 4 PRT rupture

SSHW4 P0RV1 SSHW4 A-R5W4-XHB-S1-8 A-R5W4-XHE-S2-8 RCS Loops Isolated to Cause Failure of Reflux in Window 4

m t to

POS-06

Loops Is61ated Secondory Side in window 4 ol of SGs Oroinod 06 in POSs 6 of Oroined Moinlenon

IOOPISO.ATED406 SGS-DRAINED-CSD SGS-DRANED-R L00PIS0LATEC/4R10 IO0PIS0LATED4R6 SCS-DRAINED-R Feed and Bleed the RCS in RHR5, Window 4

Feed and Bleed the RCS in RHR5, Window 4

DFR!iVf4

Feed and Bleed Safety Valve the RCS in RHR5, Removed in Window Window 4 4

FR3f4Gl SV-W4 m i oo Failure to Diagnose Recoveroble Loss of RHR in Window 4

Operator Failure FALURE OF FEED Operator failure FAILURE OF FEED to use HHSI in AND SPLL USING ot use LHSI in ANO SPLL USING feed and spill HPI Feed ond Spill LPI in Window 4 in Window 4

FSW34H FSW34L A-R5W4-XHE-FH-5 A-R5W4-XHB-FL-5 Safety Valves Removed in Window 4

Safety Valve Removed in Window 4

SV-W4 m • POS 6 of a Drained ON Maintenance Outage

SV-V4G00 SV-W4G0 P0S-D6

Pressurizer POS 10 of a Pressurizer Safety Valves Refueling Outage Safety Valves Removed in W4R6 Removed in W4R6

P0S-R6 PZR-SV-REMOVEDW4 POS-R10 PZR-SV-REMOVEDW4 Feed and Bleed the RCS with failed in RHR5, Window 4

Feed and Bleed the RCS in RHR5, Window 4

Failure to Diagnose Recoveroble Loss of RHR in Window 4 m D o FR5W. VOl D-R5W4-XHE

FR5W VG2 FR5W-VC3

FALURE OF FEED Operator Failure Operator failure FALURE OF FEED AND SPLL USING to use HHSI in ot use LHSI in AND SPLL USING HPI feed and spill Feed and Spill. LPI in Window 4 in Window 4,./ ,\

FSW34H FSW34L

A-R5W4-XHE-FH-8 A-R5W4-XHE-FL-8 Gravity from RWST in RHR5, Window 4

Gravity from RWST in RHR5 in Window 4 r 1 GR: W4 1 Safety Valve Removed in Window 4

L: > A GR5V 401 SV-W4

1 1 ' INSUF FLOW Failure to Diagnose Operator Failure THROUGH LOW HEAD Recoverable Loss of to establish INJECTION FLOW RHR in Window 4 gravity feed PATH in window 4 y\ A D6-CG n D-R5W4-XHE A-R0W4-XHE-G-5 Appendix E.6 Event Trees and High Level Fault Trees for Loss of Offsite Power (LI)

E-272 w w -2" < 2 I W

CO a QQQ QQQ QQ QQ ® ® ® O O O® O O CJ® ® O O® ® O O

or -I CO CO-* IP O -M CM CO "* ID CD £> CO a m

o

•J

8 z S5

a. Q

«

E-273

W* M=-«:*- ^iPPffr ':'-'%& UNITY ILiWi RL1W1 NL1W1 FL1W1 CL1W1 SEQ # END-STATE

L1W1D6

LOSS OF OFFSfTE POWER CAT. LI, WINDOW 1 DRAINED MAINTENANCE

1 @ 2 @ m 3 @ 4- CD 5 CD 6 @ 7 CD 8 CD top event for L1 LOSP - L1 in window 1

II frequency cmouutlon ror LITfl

Frequency of LOSP

\ / IUV io« MBO-tl u

Ou-otlon ol Frequency of POS 13 of 0 ProbobXIy Probability 10 of Refueling Refueling Refuting Outoge of POS V Owen trnl E occurs Outage Reluding Outage In KI given RIO

DURATION-RIO POS-RIO FRAC-P03W PR03-WRW

. Durotton ol Fracyeney of PCfe.6*f.o Refuting ProboMty C lolned Maintarienoe Duration of Probobltty Pi S 6 of o Drained F OS 8 of totaling Refueling Outoge that E occurs •OS 6 of DrokMd thot E occurs I ointenaneo Ouloge Outoge h v1 given R6 I oMenance Outege Vi wl gWen 06

DURATO-MW PROB-W106 Restore RHR given LI in POS 6 - Refueling

RL1W1 m Is) O ON

Failure to Restore ailure to Diagnose RHR given LI in LOSP Event in >0S 8 of Refuelin j P|OS 6 of Refueling

W3-S A-L1W1-XHE-R-13 D-L1TV1-XHE Safety valves Not Removed in Window

Safely Valves Not Remove in Window 1 0 V/1 POS X) of a POS 6 of a Drainec Refueling Outoge Maintenance Outoge

W 1G7 mi POS-R1D POS-06

^1 POS 6 of o Refuelini Outage

0vw1C 4 POS-R6

Preseurlzer Safety Vakes Removed in W«6

PZR-SV-REM0VEDW1 Non—Recovery of AC Power in 144 min. of LOOP

Si 00 NL:.W1

Non-Recovery of AC Power in 2.00 HRS

NRAC200 Reflux Cooling in window 1

Reflux Coring Given o RHRJ I , POS 6 of Refuetng

suwi-ia

Failure to Dtaqnose RCS Loops Isolated Loss of RHR Event to Cause FoJure h POS 6 of Rofkix Cooing m i to VO SR3VK3U SR3W1G0O KO-WI D-L1H1-XBK

Operotor Failure INSIF aow TO to Feed SG9 In I SG FRM AT LEAST Window I-L1 1 AFW PIMP

LSW1 SR3VK53 SR3V1G11 A-LlVft-XHE-Sf-la

Operator FolVjre FALLRE OF FAL TO aOSE FAIURE OF Operotor failure to Bleed the SECONDARY- SEE BOTH PORVS SECONDATW SIDE to eatobUah SGe I afven LI HEAT REMCWL FEAT REMOVAL reflux after F1U rupture

SSHWI PORV1 SSHrVI A-LlWi-XHE-31-ta A-LlWI-XH8-S2-t3 Reflux Cooling in window 1

Roflux Cooing Given a RHRJ li POS 6 of Refusing

Fofkro to Dfognose RCS Loops Isolated Low of f!HR Event to Cause Failure h POS 6 of Reflux Cootng

SR3VK313 V B0-W1 D-UW1-XM SR3MG00

Operator Failure ,_ INSUF FLOW 70 to Feed SGs h ! SG FRM AT LEAST Whdow M.1 1 AFW PIM>

LSW1 SR3\ 'K33 SR1V 1011

A-ll¥l-XHB-3r-i7

Operator Fodure FALIRE OF FAl TO CLOSE FALURE OF Operator folure to Bleed the SECONDARY SDE BOTH PORVS SECONDARY SIDE to eatdrfsh SGs 1 given Lt HEAT REMOVAL l-EAT REMOVAL reflux after PRT rupture

SSKWI PORV1 SSHtfl

A-LiWl-XHE-Sl-19 A-LlWl-XHB-sa-iT RCS Loops isolated to cause failure of reflux in window 1

m

POS-06

S«corrforv SW« Secondary SWo Seoondory Sldo Of SGa frdhsd of SCs Drained of SGs Orohed in POSs 6 of In POSs 6 or In POSs 6 or Dfdned Momlimn W crjiqfticlina 10 orj^qfueling.

LOOPECUTE0t)6 SGS-0R*NE0-CSD SGS-ORWNED-K LOOPtSOOJEDtflO 100PISOA1EDRB SGS-ORAINEO-R Feed and Bleed the RCS in LI Window 1

Feed ond Reed tho RCS In L1, Window I

PL1V 1-5

Food and Bteed Saloty Vo^e tha RCS In LI Removed In Window FOS 6 of Refusing 1 73 FR3' V10 SV-W1

mi to oo Faikre to Dkwnoje to Loss of RHR Event In PCS 8

FR3aR3vVF K 0 D-LW1-XHE

FR3V 1G3 FR3V 1G2

Operator fallur'« FALURE OF FEED FALURE OF FEED Operator Falun) to us8 LHSI In • AND SPR.L USNG AND SPLL USING ' to use HHSI In F«ed and Ebll LPI HPI feed ond apt! h Wndow 1 In Window 1

FSW12L FSW12H A-LlWl-XHE-rL-8 A-L11T1-IHB-PH-5 Feed and Bleed the RCS in L1, Window 1

Feed and Bleed UIB RCS In LI. Window I

a1-9 p£»f

Feed onrd Bleed Saloty VoKro the RCS In LI Removed In Window P05 6 or ReftMing 1

FR3V10 SV-W1 m i FoUre to Diagnose 00 Lose of RHR Event In PCS 8 w

uFR3V 1G0 D-UW1-XHB

FR3V K53 FRMKS2

Operator Wkro TALURE OF FEED FALURE OF EEO Oporator Fdluro to use Ufil In' •• ANO SPLl USMC ANO SPLL to use t+KI In Feed and Soli LPI HPI reed ond spll In Window 1 In Window 1

FSW12. FSW12H A-LlWt-XHE-n,- A-L1W1-XBB-PH-8 Feed and Bleed the RCS in L1, POS 6 of Refueling

FL1W1-14

Failure to Diagnose Loss of RHR Event in POS 6

m FL1W1B14- i 2? D-L1W1-XHE

Operator failure FALURE OF FEED FALURE OF FEED Operator Failure to use LHSI in AND SPILL USING AND SPLL USING to use HHSI in Feed and Spill LPI HPI •••-• feed and spill in Window 1 in Window 1

FSW12L FSW12H

A-LIWI-XHE-FL-U A-HW1-XHE-FH-14 Feed and Bleed the RCS in L1, POS 6 of Refueling

FLITT 1-18

Failure to Diagnose Loss of RHR Event in POS 6

FL1Y 1B18 D-L1W1-XHE

FLIU 1C18

Operator failure FALURE OF FEEO FALURE OF FEED Operator Failure to use LHSI in AND SPILL USING AND SPLL USING to use HHSI in Feed and Spill LPI HPI feed and spill in Window 1 in Window 1

FSW12L FSW12H A-LltU-XHE-FL-ie A-LlYa-XHE-FH-18 Gravity from RWST in L1, Window

Gravity from RWST in L1, POS 6 of Refualing m to GL1V 1-8 OS ON Safety Valve Removed in Window 1

GR3V(K32 SV-W1

. INSUF aow Failure to Diagnose Operator Failure THROUGH LOW HEAD Loss of RHR Event to establish NJECTION FLOW in POS 6 gravity feed PATH in window 1

/ D6-CG D-L1W1-XHE A-LlWl-XHE-G-a Gravity from RWST in L1, Window 1

Gravity from RWST in L1, POS 6 of Refueling

23 GL1W .-10

Safety1 Valv e Removed in Window 1

GR3W1G2 SV-W1

_ INSUF FLOW FoiKire to Diagnose Operato1r Failure THROUGH LOW HEAD Lo6S of RHR Event to eetobiish NJECTION FLOW in POS $ gravity feed PATH in window 1

D6-CG

D-L1W1-XHE A-Lrfrl-XHE-G-lO Safety Valves Removed in Window

Safety Valve Bemoved In •Window 1

SV--W1

POS 10 of a POS 6 of a Drained 00 Refueling Outage Maintenance Outage 00 7^\

SV-V1G0 POS-R10 P0S-D6

Pressurize1 r Safety Valves Removed in WR6

P0S-R6 PZR-SV-REM0VEDW1 Failure of High Pressure Recirculation n Window 1

Failure of High Pressure Recirculation in Windomifi w 1

0,1111-4

Safety Val/e Removed in Window 1

CL1W1N4 CL1T 104 SV-Wl

INSUF FLOW FM INSUF FLOW FRM Failure to Diagnose ailure of Recirculatior Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 I High P Recirc HOR in Window 1

PLl-Wl-4 D-L1W1-XHE A-L1W1-XHE-C-4 Failure of High Pressure Recirculation in Window

Failure of High Pressure Hooiroulntion In Window 1

CLlti 1-8

Safety Vabe Removed in Window 1

CL1TUN8 CL1T 1Q8 9V-W1

INSUF FLOW FM INSUF FLOW FRM Failure to Diagnose (failure of Recirculation Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 High P Rccirc HDR in Window 1

H2 PL1W1-8

D-L1W1-XHE A-L1W1-XHE-C-8 Failure of High Pressure Recirculation in Window 1

Failure of High Pressuro Recirculation In Window 1

CL1WI-13

CL1W1H13 CL1TY 1013

INSUF FLOW FM INSUF FLOW FRM Failure to Diagnose ffaikxe of Recirculotior Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 1 High P Rccirc HDR in Window 1

HI H2 PMWl-13 D-L1W1-XHE A-L1W1-XHE-C-13 Failure of High Pressure Recirculation in Window

Failure of High Pressure Hooiroulation -111 WipOOTf L..

C1UWI-17

CL1W1N17 CL1TV 1017

INSUF FLOI W FM INSUF FLOW FRM Foilure to Diagnose (failure of Recirculatior Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 High P Recirc HOR in Window 1

PL1W1-17 D-UW1-XHB A-L1W1-XHE-C-17 I «PJ(M «*PA

U03J) S931 ICH C1 33M d03if .. , dHd IS SWd JW (TO-dWd IS S3ttJ TOJ MOId dllSH

3HX-UKT-0 t-0-3HX-t#H-Y •a wo \ / L-Z 9 SOdl. ••"1°. 0 u m A-LWI-XHE-C-a D-tWMOC

NSUF FLW FRM KSLF RON FRM 1+ FRES SI PMP-OD ICW PRES S) PMP LOS REOR MCE 0 HOT LEOS RECR JML. u ZJ

Vent tfhle Safely Votnu FVJUTB of Recl-eubtlon Not Remove In Spray In Window WMow I

VENTL12 PS--Mfr« s

-It J

ami

« Operator Fdurs ro9ure to Dtognooo ^o Ejtobbh i of RHRlW rtgh P Retire In PCS 6 >'•*?• •^ .*• awoa O.WM3 m A-tWy-XHE-C-U D-LM1-XHE

L/i NSUF aw FRW NSLF RCW FRM uV PRES SHPMP-OD LCW PRES SI PMP LOS RECR MCE O HOT LEOS RECR i tttS IKSH.G aw sis aw BO

Vent Exbta Safety Vdves Fciur_-_e of Roclrcubtton Not Remove In Sproy In Window Window 1

'45 VENTLG n.WI-13 Operator Fcfcr* oiure to Kogrwee to Ertabbh I oa«

Q.W 317 CL1W3I7

Vent Edit* Safety Valve* Fou-e ol Redreulatbn Not Remove In Spray In Window Wlnefcw 1

VENIUB PLW1N4

mi Failure to Diagnose Operator Failure to Loss of RHR Event to Establish in POS 6 Recirculation Spray in W1

PL1V1X4

D-L1W1-XHE A-L1W1-XHE-P-4

FAILURE OF OUTSIDE FALURE OF INSIDE BPRAY RECIRCULATION BPRAY RECIRCULATION

F2LPSD" F^PSD PL1VMN8

Failure to Diagnose Operator Failure Loss of RHR Event to Establish 00 in POS 6 Recirculation Spray in W1

PL1VMX8 D-L1W1-XHE A-L1W1-XHE-P-8

FAILURE OF OUTSIDE FALURE OF INSIDE SPRAY RECIRCULATION BPRAY RECIRCULATION

F2LPSD' F^PSD PLW 1N13

e•n Failure to Diagnose Operator Failure Loss of RHR Event to Establish in P05 6 Recirculation Spray in W1

PLM1W13

D-L1W1-XHE A-L1W1-XHE-P-13

FAILURE OF OUTSIDE FALURE OF INSIDE [SPRAY RECIRCULATION SPRAY RECIRCULATION

F2LPSD F^PSD PLW 1N17 m i Failure to Diagnose Operator Failure o o Loss of RHR Event to Establish in P05 6 Recirculation Spray in Wl

PLW 1X17 D-L1W1-XHE A-L1W1-XHE-P-17

FAILURE OF OUTSIDE FALURE OF INSIDE SPRAY RECIRCULATION BPRAY RECIRCULATION

F2LPSD FtPSD UNITY IL1W2 RL1W2 VW2 NL1W2 SL1W2 FL1W2 GL1W2 CL1W2 SEQ # END-STATE -NAM ES

L1W2R6 — LOSP L1, WINDOW W2, POS R6

•;£>'

i <8> 2 @ 3 @ 4 CD 5 CD 6 CD m 7 @ o 8 CD 9 CD 10 CD -'© 11 © &,?, 12 $> 13 CD 14 CD 15 <£ 16 ® 17 CD 18 CD 3£ UNITY IL1W2 RL1W2 NL1W2 SL1W2 FL1W2 CL1W2 SEQ # END-ST\TI

L1W2D6 — LOSP L1, WINDOW W2, POS D6

m i @ o 1 to 2 @ 3 @ 4 @ 5 CD 6 CD 7 @ 8 9 CD 10 CD I top event for L1 In window 2

IB FptqUfn«y Citioumion for

Frequency of U m FftBQ-U s LJ

Du-oUon ol Frequency of POS tt of o Probobtlty ProbobMy p» 10 of Refwllno, Refue&ng Rotolng Oul.099 of POS t)

u DURATION-RIO a

(Xrallon ol Fneayency of PC S. 6" of .0 Rotutlng ProboMty C x*wd Mfttonaxa ,.•> Duration of Probability P< 6 6 of o Drained F 3S 6 of Refuelng RefueSng Outogo thai E occurs that E occirs oWtnonco Outcao Outoga In wl glwn R6 I- rtnteronce Outage In Hi gVen 06

DURANON-fW POS-ftfS DR-WT IXRMION-W PE0B-W2DS POS-D9 Restore RHR given LI in POS 6 - Refueling

RL1W2 mi o

Failure to Restore ailure to Diagnose RHR given LI in LOSP Event in Loss of RHR >0S 6 of Refuelin j P|OS 6 of Refueling POSa 3-13

W3-S A-L1WE-XHE-R-13 D-L1W2-XHE Safety valves Not Removed in Window 2

Safety Valves Not Remove in Window 1

nW2

POS 10 of a 30S 6 of a Drained Refueling Outage Maintenance Outoge

o nVW! G7 POS-R10 P0S-06

f OS 6 of a Refueling Outage

VW; 04 P0S-R6

Pressurizer Safety Valves Removed in W1R6

PZR-SV-REM0VEDW2 Non-Recovery of AC Power in W2

o 0\ NL.W2

NON-Recovery of AC Po-wer in 2.6E HRS

NRAC262 Reflux Cooling in window 2

RofK*< Cooing G'won o LI 11 POS 6 of Rehiring

311^3-13

FdVjro to Dioqnose RCS Loops Isololed L099 of RHR Evont to Couss FoJur« h POS 8 of Rofkjx Cooling

SR3VKJU SR3W1G0O ISO-W2 D-Lllffc-XHE

Optrotor Follure INSUF TLOW TO to Feed SGs In ! SG FRM AT LEAST Window 2-L1 1 AFW PUMP

SR3\ 'X33 SR3V 1C11 A-LlWS-XHB-Sr-13

Operator Folliira FALLRE OF FAIL TO CLOSE FALURE CF Operator foilura to Bleed the SECONOARY SDE BOTH PORVS SECONOARY SDE to 03tcMoh SOs I grVen Lf HEAT REMOVAL F€AT REMOVAL reflux otter PRT rupture

PORV1 8SHW23

A-LlWe-XnB-81-13 I A-Liwe-xnB-se-13 Reflux Cooling in window 2

MKK Cootng Gtven o LI li POS 6 of Refueling

anwa-tr

Foflure lo Diagnose RCS Loops Isolated Loss of RHR Event to Cause Failure Vi POS 6 of Roflux Cooing

SR3V 1GU \ / V D-MWe-XHE SR3VMGOO

Operotor Foc'luro INSLF FLOW TO to Feed SGa in S SG FRM AT LEAST Wbdow 2-L1 I AFW PUMP ZJ SR3V 'K33 SR3V ton A-UW2-IHB-Sr-17

Operator Fofkjro FALIRE OF FAL TO aOSE FAILURE CF Operolor foJure to Bleed the SECONOARY SDE BOTH PORVS SECONOARY 30E to e9tabfsh SCs t given LI HEAT REMOVE. t-CAT REMOVAL reflux otter PRT rupture

3SHW23 PORV1 I A-nwe-xHB-si-iy A-LtwE-xnB-se-ir RCS Loops isolated to cause failure of reflux in window 1

mi o VO

POS-06

Loops bototed Secondary Side In window 1 of of SGa Groined 06 In POSs 6 of Drofned Mojnlwwn

LOOPI80LATED2DB SGS-DRANE0-CS0 SGS-0RAJNEO-K LOOPI30LA.TBD8IUO LOOPISOU.TEDEB6 SGS-DRAINEO-R Feed and Bleed the RCS in L! Window 2

m

A-L11T8-XHB-H-8 A-UTZ-XHE-rH-fl Feed and Bleed the RCS in LA Window 2

Feed and Bleed the RCS In LI, Window 2 TT Putt 2-9

Food and Bleed Safety VaVe the RCS In LL Removed In Window POS 6 of Refusing 2

FRJY10 SY-TT3

Fofkro to DtoorKne Low of RHR Event In POS 8

uFR3VKO D-L1W2-XHE

FR3V 103 FR3V £2

1 1 Operator failure- ,< FALURE OF FEED FALURE OF FEEO Operato1r Falure to use LHSr In ' AND SPILL USING AND SPLL USNG to use l-HSI In Feed and Sell LPI HPI feed and epll In Window? A In Window 2 o FSW12L FSW12H k-UYZ-XBB-Il-9 A-LlW2-XH2-rH-8 Feed and Bleed the RCS in L1. POS 6 of Refueling

FLtfYS-U

Failure to Diagnose Loss of RHR Event in POS 6

D-L1W3-XHE

FL1TV 3C14

Operator failure FALURE OF FEED FALURE OF FEED I Operator Failure to use LHSI jn AND SPILL USING AND SPLL USING to use HHSI in Feed and Spill LPI HPI feed and spill in Window 2 in Window 2

FSW12L FSW12W

A-L1W3-XHE-FL-14- A-L1W2-XHE-FH-14 Feed and Bleed the RCS in LI POS 6 of Refueling

FLIT* 3-18

Failure to Diagnose Loss of RhR Event in POS 6 D FL1W3B18 D-L1W3-XHE

FMT1 3C18

Operator failure FALURE OF FEED FALURE OF FEED Operator Failure to use LHSI |n AND SPILL USING AND SPLL USING to use HHSI in Feed and Spill LPI HPI feed and spill in Window 2 in Window 2

FSW12L FSW12M

A-L1W3-XHE-FL-18 A-LIW3-XHE-FH-18 Gravity from RWST in L1, Window 2

Gravity from RWST in LI, POS 6 of Refueling m GLHV2-6

Safety1 Valv e Removed in Window 2

GR3W1G2 SV-W2

INSUF. FLOW Failure to Diagnose Operato1r Failure THROUGH LOW HEAD LOBS of RHR Event to establish NJECTION FLOW in POS $ gravity feed PATH in window 2

D6-CG D-L1W3-XHE A-L1W2-XHE-G-8 Gravity from RWST in L1, Window 2

Gravity from RWST in LI, POS 6 of Refueling m i—» O GL1W J-iO

Safety Valve Removed in Window 2

GR3V f 1G2 SV-YT3

,_ INSUF FLOW Failure to Diagnose Operator Failure RTTOUGH LOW HEAD Loss of RHR Event to establish NJECTION FLOW in POS 6 gravity feed I PATH in window 2

D6-CG D-L1W3-XHE A-L1W2-XHE-G-10 Safety Valves Removed in Window 2

Safety Valve Removecf in Window 1 m I—* SV- •W2

POS 10 of a POS 6 of a Drained Refueling Outage Maintenance Outage r\

SV-W2GD POS-RIO P0S-D6

Pressurizer Safety Valves Removed in WT!6

P0S-R6 PZR-SV-REM0VEDW2 Failure of High Pressure Recirculation in Window 2

Failure of High Pressure Recirculation In Window 8

CL1W2-4

Safety VaU$ Removed in Window 2

CL1W2CPZM CLJW 204 SV-W2 CL1W2N4

INSUF FLOW FM INSUF FLOW FRM Failure to Diagnose (faikjre of Recirculotior Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 2 High P Recirc HOR . in Window 2

HI H2 PL1W2-4 D-UW2-XHE A-UW2-XHE-C-4 Failure of igh Pressure Recirculation in Window 2

Failure of High Pressure Rooiroulntion In fftDdOYf 8

CLiV 2-8 m co Safety Val/e Removed in Window 2

L1WKCPZM CLJLY 2GB SV-W2 CL1W2N8

INSUF FLOW FM INSUF FLOW FRM Failure to Diagnose (failure of Recirculation Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 2 High P Recirc HOR in Window 2

PL1W2-B D-LltVa-XHE A-L1W2-XHE-C-B Failure of High Pressure Recirculation in Window 2

'ftllUM Of Hl£h Pr4>tur« RibtrouUlloik In yi&donw a SLUM-IS

ZI Z3

WSUF FLOW FM NStF ftOW FPM I oikjf* to Diognoi* Foi r« ol Rtdrcobllon Optrolor FaHur* . LPSI PMPS TO 3 CWW PMPS N I >»» ol RW Eva* Sproj In \Wndow 16 EotobUh dHURO PUMP SUCT THE REOR M0C6 h POS 6 2 Kqh P Reclro "">B KMrifrB?

D-nira-iHi A-Ll«a-XKS-I

D-LfWZ-XBJ! A-Llirj-XHI-C-13 Failure of High Pressure Recirculation in Window 2

r»llur» of KUh Prtiiurt RMlwiuUtton In Window B

CHIT 017

NSW FVOW FM NSUF FLOW TRN Fofluro to Dfaono«« Fttur_ »- of Reetxdatlon LPSt PUPS 70 3 CHRG PMPS IN an of RHR Event Sony In Window CWRG PUMP SUCT THE RECR MOC£ In POS 6 D-UW3-XH1 A-11W2-XH1-X

puw*-ir D-UW2-XHB A-in»e-«n-c-i7 Failure of Recirculation Spray in Window 2-cause HPR failure

FnilUTO Of Recirculation Spray in —•VTiadow 8

PL1W Z-i-

loss of HPSH du i to open contoinmer: m to L1W2CPZM PR3VK) CON-VFC-RP-COREM

Failure to Diagnose Operotor Failure Loss of RrR Event to Establish in PCS 6 Recirculation Sprcv in W2

PR3VCIG0

D-L1W3-XHE A-UW3-XHE-P-4

FALURE OF NSDE rALURE OF OUTSIDE SPRAY RECIRCULATION iPRAY RECIRCULATION

F1PSD F2LPSD Failure of Recirculation Spray in Window 2-cause HPR failure

Failure of Recirculation Spray In —Window X

PLlti 3-8

loss of HPSH dub to open contoinmerjt m w to to L1W3CPZM PRJ V10 CON-VFC-RP-COREM

failure to Diagnose Operator Failure Loss of RHR Event to Establish in POS 6 Recirculation Spray in W2

PR3VMG0

D-L1W3-XHE A-L1W2-XHE-P-B

FALURE OF NSDE FALURE OF OUTSDE PRAY RECIRCULATION SPRAY RECIRCULATION

F1PSD F2LPSD Failure of Recirculation Spray in Window 2-cause HPR failure

Failure of Reolroulntion Spray In —Window 3

PL1W 2-13

loss of HPSH dufc to open contoinmerjt m HWSCP2M PR3Y10 CON-VFC-RP-COREM I Falure to Diagiose Operator Failure Loss of RHR Event to Establish in POS 6 Recirculation Spray in W2

PR3VHG0

D-L1W2-XHB A-L11T2-XHE-P-13

JFALURE OF NSDE FALURE OF OUTSDE fcPRAY RECRCULAT10N IPRAY RECIRCULATION

F1PS0 F2LPSO Failure of Recirculation Spray in Window 2-cause HPR failure

Failure of Recirculation Spray In —"Window »

PL1W !-17

loss of HPSH dui to open contoinmerjt

L1W2CP2M PR3V10 CON-VFC-RP-COREM

Failure to Diagnose Operator Foilure Loss of RHR Event to Establish in POS 6 Recirculation Sprav in W2

PR3W1C0

D-L1W2-XHE A-L1W2-XHE-P-17

FALURE OF NSDE FALURE OF OUTSIDE SPRAY RECRCULATION SPRAY RECIRCULATION

F1.PSD F2LPS0 Correnotlon to Recirculation FTs (C and P) in Windoi|r 2 m i K L1W2 !PZM

(Failure to Diagnos Operator Failure J to Cross Connect I FAILURE OF FEED ^038 of Power Eveht AND SPILL USING Hh in Wlndo-w Z^ R\TST Qivcn successful nrri

FSW12H D-MW2-XHB A-MW2-XHB-X dtut to Dtognow 11»« o< RtR Eva* h POS 6 U" r

A-LM2-XJ€-C-i

I61F fUW FRH WSUF ROW FRM m FRES 3 PMP-CU5 .OW FRES St PHP LGS RECR MCE 10 HOT IBS REOR to 1*61 I I MOPE ZJ HAS HfSH-0 aiws*

Vent Exkts Safety Votvas j-e of Rcctxitatton Hot R«n»v» h Sproy Vi Wlndw WWm 1 2

VENILtt PLWSN4 VW2 PLW2-* &

am

roturo to Dlognou ora of RH* Event In FOS 8

•it

uO.WIM u A-LW2-XHE-C-8 m NSUF aw FRW NSIF RCW FRM LW PRES si PMP-CLD LOW PRES 3 PMP LOS m MCC 0 HOT LEOS REOR

KASH.G aw tea atiV!88

Vent Extols Safely Volvtis Fclur_ e_ of Rectrcubtfon Not Remove In Spray In Window Window I 2

VENatt VW2 Oporolcr Fdtuni H"o EstoMsh H* P Racre tf WlrrfW 2 u m A-LWTC-XHi-C-U w 00 NSUF FLW FRM NSLF RCW FRM LU PRES SI PMP-O.D LCW PRES SI PMP LOS RECR. MCE 0 HOT LEOS RECR ZT WSH.G CLW B13

Vent Exbln Sofoly VOKOT Fi*Jro of RodrcubUon Not Rjnxvt In Spray In Window Window 1 2

VOm.12 RW2N0 VW2 •'$

atw|w7

Cprotor Fdkrt o»ur« to CXognoot to Eatcbtsn H* P R«c*o >lPOS 6 I KW1r«t» ?

I aw:Dt7 u A-1.W2-XVE-C-17 M.W2-XHE

1 IT NSIF fUW FRM HSUF FLOW FRM w PRES 3 PWP-CID .OW PRES St PHP to .CS DECR ND£ 1D HOT l£GS fiECfi ftps) I I woe ... ZJ s HAS mSttfl CLW:0I7

Safely Votwa Fou-o ol Rfdrciiattan Hot R»mov» h Sproy Vi Wridw* WMM 1 2

'-Wi

VENTL12 aiW2-17 46 Failure to Diagnose Operator Failure w Loss of RHR Event to Establish o in POS 6 Recirculation Spray in W2 7~S

PL W 2X4

D-L1W2-XHE A-L1W2-XHE-P-4

FALURE OF OUTSIDE FAILURE OF INSIDE SPRAY RECIRCULATION ISPRAY RECIRCULATION

F2LPSD F1LPSD PL1W2N8

Failure to Diagnose Operator Failure Loss of RHR Event to Establish in POS 6 Recirculation m Spray in W2

PL1W2X8 D-L1W2-XHE A-L1W2-XHE-P-8

FAILURE OF OUTSIDE •FAILURE OF INSIDE SPRAY RECIRCULATION SPRAY RECIRCULATION

F2LPSD F1LPSD PL-M2N13

Failure to Diagnose Operator Failure Loss of RHR Event to Establish in POS 6 Recirculation Spray in W2

PL M 2X13 D-L1W2-XHE A-L1W2-XHE-P-13

FAILURE OF OUTSIDE FAILURE OF INSIDE SPRAY RECIRCULATION SPRAY RECIRCULATION

F2LPSD F1LPSD ;#i I

PL1W2N17

tn Failure to Diagnose Operator Failure Loss of RHR Event to Establish in P05 6 Recirculation Spray in W2

$*2 7~\

S'/|fJt PL 1W 2X17

D-L1W2-XHE A-L1W2-XHE-P-17

FALURE OF OUTSIDE FAILURE OF INSIDE ISPRAY RECIRCULATION SPRAY RECIRCULATION

F2LPSD F1LPSD UNITY IL1W3 RL1W3 VW3 NL1W3 FL1W3 GL1W3 SEQ 4 END-STATE-NAMES

L1W3R6 LOSP L1, WINDOW W3, POS R€»

i @ 2 ® 3 @ 4 CD 5 CD m 6 i 7 CD w 8 CD 9 © 10 CD 11 @ 12 CD =te Q 00 i oa oo ^ in co {>OD O -Or m ^ CO £ ^ fa Qo

CO Z ^ tH •J m •^— _l

CO Q_ £ 00 O z _J 1i CO | £iH CD Q K) ^ CO _l £»H l-J 1—1

>- Bh—-i !S P

E-335

: 33»>'••"&«&. ^^^!WV' ^:^i<. ^4«->4' UNITY IL1W3 RL1W3 VW3 NL1W3 FL1W3 GL1W3 SEQ # END-STATE-NAMES

L1W3R10 — LOSP L1, WINDOW W3, POS R10

1 2 @ 3 @ 4 CD 5 CD 6 @ 7 CD <3\ 8 CD 9 © 10 CD 11 te> 12 CD I top event for L1 In window 3

II rr«quvncnr Oloumlon tor uttwo ILl|T3

Frequency of

\^y IL1V3A.

FRBQ-L1 u

rxrotton ot Frequency of PCS 10 of o ProcobiKy ProbobiHy TO of Refusing Refusing Refining Outoge of POS t) Owed frul E occurs Outcgo Refueling Outage In Hi given RIO

u POS-RW PH0D-H3H10 u

fAreUon of Fnscueney of PC!.8'of .b Refueling ProbceMy [ dned M*ilontna> . nrqllon of ProboWHy P> S 6 of o Orolned F OS 6 of ftefueMe. Refueling Outogo (hot E occurs •OS fil Drained thot E occire * oMenonco Outoge Outoge In *1 grusn R6 KoMenorce Outage In »l Q>en 06

DR-WT PBOB-W3D0 Restore RHR given LI

RL1W3

00

Failure to Restore Failure to Diagnose RHR given LI in LOSP Event in Loss of RHR 'OS 6 of Refuelin; POS 6 of Refueling FOSs 3-13

W3-S A-L1W3-XHE-R-4 D-L1W3-XHE Safety valves Not Removed in Window 3

vw:G4 P0S-R6

Pressurizer Pressurizer Safety Volves Safety Valves Removed in W3R6 Removed in W3R6

PZR-SV-REMOVEDW3 PZR-SV-REM0VEDW3 Non—Recovery of AC Power

m i

NL ;.W3

Non-Recovery of AC Power in 3.48 HRS

NRAC346 Reflux Cooling in window 3

RefkK Cooing Oven a RHR3 Ii POS 6 of Rofuetng

Foilur© to Diagnose RCS Loop1s Isolated L099 of RHR Event to Causs Failure In POS 6 of Reflux Cooling V IF SR3W1G00 SR3YK313 D-HTT3-XHE

Operator Fa'hjro L INSUF FLOW TO to Feed SGe In 1 SG FRM AT LEAST Window 3-L1 1 AFW PUMP

SR3WK33 SR3VW11 A-uvfa-xna-sr-a

Operato£r Fothjre FALLRE OF FAL TO aOSE FAIURE CF Operolor foilura to Bleed the SECONDARY SOE BOTH PORVS SECONDARY SIDE to eatobtah SOs I given LI HEAT REMOVAL rCAT REMOVAL reflux oiler PRT ruolure

aS!W23 PORV1 SSJW33 A-LIW3-XHE-S1-S A-LlW3-XHE-Be-3 Reflux Cooling in window 3

RefkK Cootng Given o RHR5 Ii POS 6 of Rofuefng

Foi'lure to Dtoqnoso RCS Loops Isolated L099 or RHR Event to Cause Failure h POS 6 of Reflux Cooling tT)

SR3VK313 V I80-W3 D-L1W3-XHE SR3WX300

Operotor Folfcjre „ INSUF FLOW TO to Feed SGs In > SG FRM AT LEAST Vfirdow J-L1 1 AFW PUMP

SR3V1G3 9 A-IiWS-XHB-SF'-a SR3V 1G11

Operator Foiluro FALLRE OF FAl TO aOSE FALURE CF Operolor failure to Bleed the SECONDARY SOE BOTH PDRVS SECONDARY 3DE to estoblisn SGs 1 given LI HEAT REMCVAL t€AT REMCrvVH. reflux otter PRTjVRJIfd

8SHH33 PORV1 A-LIW3-XHE-S1-B A-LlW3-XHE-aa-B RCS Loops isolated to cause failure of reflux in window 3

6

P0S-D6

Secondary SIdtr of SG9 Drained In POSs 6 of D'oincd.MgTtfflgi

SGS-DRAJNED-CSD LO0PISCLATED306 L0CftSCUTE03RX) SGS-ORANED-fl LO0PISCLATCD3R6 SCS-ORAINEO-R ed and Bleed the RCS in L1, Window

Faed end Bleed the RCS In l\ Window 3

PM1 3-4

Feed and Bl««( Safety Vat/9 the RCS In L1 Removed In Window 3 7? FR3Y»

Failure to Wognoae LOBS O( RHR Event

nFR3V KO D-L1W3-XHE

7? "9" FR3VKJ2 FR3V '103

Operotor failure rALURE OF FEED FALURE OF FEED Operator Folure to use LHSI In ANO SPLL USNG AND SPU. USNG to use 1+tSI In Feed and Spll LPI HPI feed and spll In Window 5

FSW1X FSW12H A-l«T3-IHB-rL-+ A-LlW3-Xlte-rH--i and Bleed the RCS in L1, Window 3

Feed and Bleed the RCS In LI. Window 3

PUH 3-7

Food and Hood Solely VaVo tho RCS In L1 Removed In Window 3

fKSW

FdXro lo WOOTKHO Loss of RHR Event

•FR3V K O D-M1T3-XHB

FR3V 103 FR3\ 102

1 I Opwotor follur'* .< FALURE OF FEEO FALURE OF FEEO Oporator FoJure to use LHSI In ' AND SPll USNC AND SPLL USNG to use HHSI In Feed and Sbll LPI HPI feed ond spit h WWkw3 A In Window's o FSWKL FSW12H A-L1W3-IHB-FL-7 A-Llirj-XKB-fB-7 Feed and Bleed the RCS in L1

FLITY 3-10

Failure to Diaqnose Loss of Rl-fi Event

FL1W3B10 PI D-L1W3-XHE I

FLJUV3C10 FL1W3D10

Operator failure FALURE OF FEED FALURE OF FEED Operator Failure to use LHSI in AND SPILL USING AND SPILL USING to use HHSI in Feed and Spill LPI HPI feed and spill in Window 3 in Window 3

FS'W34L FSW34H A-L1W3-XHE-FL-10 A-L1W3-XHE-FH-10 Feed and Bleed the RCS in L1

FLW3-12

Failure to Diagnose Loss of RHR Event

FL1W3B12 D-L1W3-XHE

FIii>V3C12 FL1W3D13

Operator failure FALURE OF FEED FALURE OF FEED Operator Failure to use LHSI in AND SPILL USING AND SPLL USING to uae HHSI in Feed and Spill LPI HPI feed and spill in Window 3_ in Window 3

FStmij FSW34H A-L1W3-XHE-FL-12 A-LrW3-XHE-FH-12 Safety Valves Removed in Window

Safety Valve Removed in Window 1

SV-W3

POS 6 of a Drained Maintenance Outage

SV-V3G00 SV-W3G0 POS-D6

Pressurizer POS 10 of a Pressuizer Safety Vdves Refuefng Outage Safety Valves Removed in WR6 Removed in W1R6

P0S-R6 PZR-SV-REMOVE0W3 POS-R10 PZR-SV-REM0VEDW3 Gravity from RWST in L1, Window 3

Gravity from RWST n LI. r 1 M.11V 3-0 1 Sofoty Valve Removed in Window 3

i :> A CR3Vf1G2 SV-W3

I 1 INSUF aow Failure to Diagnose Operator Failure n-ROUGH LOW HEAD L066 of RHR Event to establish NJECTION FLOW gravity feed APATH inA window 3 D6-CG n D-L1W3-XHE A-Ufra-XHE-G-O Gravity from RWST in L1, Window 3

Gravity from RWST in LI,

m Gil* 3-8 ©

Safety Valve Removed in Window 3

GR3VK52 SV-W3

INSLF FLOW Failure to Diagnose Operator Failure THROUGH LOW HEAD L066 of RHR Event to establish NJECTION FLOW gravity feed PATH in window 3

D6-CG D-L1W3-XHE A-L1VT3-XHE-G-8 UNITY IL1W4 RUW4 VW4 NL1W4 FL1W4 GL1W4 SEQ # END-STATE-NAMES

L1W4R6 — LOSP L1, WINDOW W4, POS R(>

1 @ 2 3 @ 4 OK 5 CD tn 6 @ 7 OK 8 9 n 10 CD 11 (s> 12 CD V'-i W S <; z t I E-

i P z Q Q ca <§><§> <§>(§; o®® O m Q =*t cy (y-j -H C\2 00 ^ ID CO Z> 00 H GQ O LLPi _

-* £ ^ fc, o Z "* £ <: ^H J ^ CO _l

"* CL «= if) O O z __l 1 -* | £ CD RL l Q

•* 1 j c—t

5~ E-< r—< Z P

E-352 UNITY IL1W4 RL1W4 VW4 NL1W4 FL1W4 GL1W4 SEQ # END-STATE-NAMES

L1W4R10 — LOSP U WINDOW W4, POS F 10

1 @ 2 @ && 3 @ 4 OK 5 CD 6 ® m 7 OK 8 9 e ®n 10 CD 11 ® 12 CD top event for L1 In window 4

II rr«qu«n«r Cftleulation for

Fr*quency of

\ / n.iv IA PtlBO-tl

CT

Dirotten of Frequency of POS tt of o ProbobiKy Proboblity 10 of Refusing Refilling Roluting Outage of POS t> Gwn ttat E occurs Oulogo Refuefrt] Outage In wl g/ven RIO

7T FTOC-POS10 FROB-W»H10 u

Du*otV>n of Fnsoyeney of PCfe. 6'of.'o Refuting Probobmy C ttoed KtaWanenee .•\ Duration of PlObObIM/ P> 5 6 of o Drained F 3S 6 of Ro(uftVn] Refuefrig Outoge that E occurs OS *6 St Drained that E ocar« * olntenonco Outcge OLAOO.6 In *1 gr«n R8 ^ olntenanco Outage Vi wl gVen 06

PH0B-1MR8 PROB-y(D« Restore RHR given LI

'•'•';

RL1W4

Failure to Restore ailure to Diagnose RHR given LI in LOSP Event in Loss of RHR >0S 6 of Refuelinb PjOS 6 of Refueling PDSs 3-13

W3-S A-L1W4-XHE-R-5 D-L1"W4-XHE Safety valves Not Removed in Window 4

Safety VaK-es Not Remove in Window 3

POS 6 of o Droinec Maintenance Outage m wi ON VWIG7 a VWiGO P0S-D6

POS 6 of o Refuelin) POS 10 of a Outage Refuelncj Outage

VWK34 VW1G1 P0S-R6 P0S-R10

Pressurizer Pressurizer Safety Vo^es Safety Vdves Removed in W4R6 Removed in W4R6

PZR-SV-REMOVEDW4 PZR-SV-REM0VEDW4 Non-Recovery of AC Power

i

NL "W4

Non-Recovery of AC Power in 4.55 HRS

NRAC455 Reflux Cooling in window 4

R«ALK Coorng Given a RHRJ POS 6 of Refuofng

SLl**-3

Failure lo Dioqnoso RCS Loops Isolated Loss of RHR Bier/I 1o Couse Foilurs h POS 6 of Reflux Cooling Q SR3V K513 SR3VMG00 iso-vrv

D-L1TU-XHB

Operator FoiKjro INSUF FLOW TO to Feed SOS In 0 SG FRM AT LEAST Window 4-LI 1 AFW PUMP ZrT LSW4 SR3VK33 SR3V 1G11

A-UH4-XHE-SP-5

Operator Failure FALLRE OF FAL TO CLOSE FALURE CF Operato1r failure to Bleed the- SECONDARY SOE BOTH PORVS SECONDARY 3DE to estcbteh SGs I 9~en Lt HEAT REMOVAL rEAT REMOVAL reflux oiler PRT ruoture

PORV1

A-LlWi-XHE-31-3 A-LnM-XHB-S2-a Reflux Cooling in window 4

Reflu* Cooing Given o RHRJ I POS 6 of Refusing

Fa'lur« to Diagnose RCS Loops Isolated L099 of RHR Event to Cou»9 Folure h POS 8 of Reflux Cooling

Q TT SR3VMGOO SR3U K5U D-UW-i-XH\^_^/ B

Operator FoiKjro „ INSUF FLOW TO to Feed SG3 In 1 SG FRM AT LEAST Window 4-LI 1 AFW PUMP

LStU SR3V1G3 SR3V 1G11 A-UW4-XHE-SP-B

Operotor Folturo FALLRE OF FAIL TO aOSE FAILURE CF Operato_rL folur o to Steed the SECONDAW SDE BOTH PORVS SECONDARY 3DE to eatcblah SGs I given Lt HEAT REMOVE FEAT REMOVAL reflux after PRT rupture

PORV1 ssnvu A-LIIM-MB-SZ-a A-LlW*-XHE-3i-"a8 RCS Loops isolated to cause failure of reflux in window 4

Secondary Side of SG9 Drained In POSs 6 of froined Ktjijrrlenori

SGS-DRANED-CSD L00P1S0LATEWDB LOOP!SOUUTD«RiO SGS-ORANED-R LOOP!SOLA.7TD«RB SCS-ORAINED-R Feed and Bleed the RCS in LA Window 4

Feed and Bleed tha RCS In 11, Window 4 IT FI.1> '4-5

Food ond BMed Salety Vok/o the RCS In L1 Refnoved In Window 4 73 FR3/10

Failure to Dkranwti Lo«a of RHR Event

FR3V 1G3

Operator fdlur.* > FALURE OF FEED to uss LHSI In' • ANO SPtl USNG F«ed and Sbll LPI h Whdow4

FSW1X FSW12H

A-lllTi-XHE-rL-O A-L1W4-IHB-PH-9 Feed and Bleed the RCS in L1, Window 4

Feed and 8teed the RCS In L1, Window 4

PL1> 4-B

Feed and Steed Sal»ty Vaf/e tho RCS In LI Removed In Window 4

7? BY-1T-* re;»

Foflure to W«r>ose Loss of RhK Event IT FR3Y KO D-WW4-XHB

FR3V 1G3 FR3\ KJ2

Operotor toftjre. FALURE OF FEEO FALURE OF FEEO Operator FdSure to use LKSI In ' AND SPU USNG AND SPll USNG to use HHSI In Feed and Sill LPI HPI feed and soil h Winoow4 In Window*

FSW12L FSW12H A-Lnr4-XHE-n.-8 A-Llir-t-XBB-rH-B Feed and Bleed the RCS in LI

FL1TU-10

Failure to Diagnose Loss of RHR Event

n4B10 FLUY D-L1W4-XHE

FlillV •tcio FL1W4D10

Operator failure FALURE OF FEED FALURE OF FEED Operator Failure to use LHSI in AND SPILL USING AND SPLL USING to use HHSI in Feed and Spill LPI HPI feed and spill in Window 4 in Window 4

FSW34L FSW34H A-L1W4-XHE-FL-10 A-L1W4-XHE-FH-10 Feed and Bleed the RCS in LI

FLr*K-12

Failure to Diagnose Loss of RHR Event

FL1W 4B13 D-L1W4-XHE m i U)

FL11V4C12 FL1W4D12

Operator failure FALURE OF FEED FALURE OF FEED Operator Failure to use LHSI in AND SPILL USING AND SPLL USING to use HHSI in Feed and Spill LPI HPI feed and spill in Window 4 in Window 4

FSW34L FSW34H A-L1W4-XHE-FL-12 A-LrW4-XHE-FH-1.2 Gravity from RWST in L1, Window 4

Gravity from RWST in L1 m in TT ON GL1W4-0

Safety Valve Removad in Window 4-

CR3W1G2 SV-W4

,_ INSUF FLOW Failure to Dlognose Operator Failure rHROUGH LOW HEAD Loe$ of RHR Event to establish NJECTKJN FLOW gravity feed PATH in window 4

W-CG D-UW4-XHB A-Ll\fa-XHE-G-B Gravity from RWST in L1, Window 4

Gravity from RWSTin LI

GUN4-a8

Safety Valve Removed in Window 4

GR3VfW2 SV-W4

INSUF FLOW Failure to Diagnose Operator Failure P>fiOUGH LOW HEAD L06S of RHR Event to establish NJECTION FLOW gravity feed PATH in window 4

D6-CG D-L1W4-XHE A-L1TT4-XHE-G-B Safety Valves Removed in Window 4

Safety Valve Removed in Window 1

SV-W4

POS 6 of a Drained Maintenance Outage m i* ON -J

SV-V4G00 SV-W4G0 P0S-D6

Pressurizer POS 10 of a Pressurizer Safety Vdves Refusing Outage Safety Valves Removed in W4R6 Removed in W4R6

P0S-R6 PZR-SV-REM0VEDW4 POS-R10 PZR-SV-REM0VEDW4 Appendix E.7 Event Trees and High Level Fault Trees for Loss of Offsite Power(L2)

E-368 ,,,d UNITY IL2W1 RL2W1 VW1 NL2W1 SL2W1 FL2W1 GL2W1 CL2W1 SEQ # END-STATE-NAME

I L2WIR6 LOSP L2, WlhCOW W1, POS R6

<«4 1 I 2 @ 3 @ 4 CD 5 CD 6 CD 7 8 CD 9 CD 10 CD 11 12 <2> 13 CD 14 CD 15 M 16

Q PP P p @> @ <§> O O® O U

C\J CO ^ lO CO 2> CO

CO

GO O O CL

Q < Q

8 IS

CM

D. CO O

CD Q

CN

C\2 .-3

E-370 top event for L2 LOSP - L2 in window 1

II fttqumnr Calculation for nLCTl

Fr«f»n« of LOSP

eIRSQ-LxS ~v

. DiroUon ol Frequency of POS 10 of o Probobity ProbobJUy Pte V of Refueling Refueng Reluelng Outogo of POS T> OfcW) (hot 16 occurs Outoge Ratudhj Outoga In nl gVen RIO

u DURATIOH-R10 Rtna. POS-RK) FRAC-POS10 u

[Xrotlori Of Freqjtney of POB.e.'of.b Refuting ProboMty tyoined l&ntonenos gtfon of ProboMMy Pg OUtflgo that E ccoure _ 61 Orated that £ occu-i kjolntenonce Ouloge Outoga h *1 gtosn RJ :enonco Outoga kt Hi gVm 06

0URATON-fi6 POS-R6 DR-MT Restore RHR given L2 in POS 6 - Refueling

RLJW1

-J

Failure to Restore Failure to Diagnose RHR given L2 in LOSP Event in Loss of RHR 50S 8 of Refuelin j POS 6 of Refueling POSs 3-13

W3-S A-L2W1-XHE-R-13 D-L2W1-XHE m Non-Recovery of AC Power in 144 min. of LOOP

m

rn

NL;:WI

Non-Recovery of AC Po-wer in 2.00 HRS m 1

NRAC200 Reflux Cooling in window 1

R«fU< Coring Given a L2 11 POS 6 of Refusing

A-LeWl-XHB-Sr-13

SSHWI PQRV1 SSW1 A-L8W1-XHB-B1-13 A-U5iri-XHB-S2-13 Reflux Cooling in window 1

Reflux Cooing Given a L2 I POS 6 of Refusing

3L8T«1-17

Failure to Dtoqnose RCS Loop1s Isolated L099 Of RHR Evsnt to CauM Foiurn Vi POS 6 of Reflux Cooing

SRJVKiU V D-LfcTfl-XHE SR3V.1GO0

Operator Failure .. INSUF FLOW TO to Feed SGa h 1 SG FRM AT LEAST Window I-L2 1 AFW PIMP

LSWt Q SR3V1G11 A-uwi-iHB-sr-n SR3\TG3

Operolor Failure FALLRE OF FAIL TO CLOSE FALURE OF Operator folure to Bleed the SECONOARV SEE BOTH PORVS SECONDARY SIDE to 09tdD«3h SGs I grvcn Lt HEAT mKHH. HEAT REMOVAL reflux otter PRT rupture

SSHWI PORV1 SSHWI A-L«Jn-XHB-8i-i7 X-LZWL-XBB-Bi-a Feed and Bleed the RCS in l_2, Window

Feed and Bleed Uw RCS In L2, Window I IT PL2I 1-3 £ Feed and Howl SaMy Volvo the RCS In 12. Removod In Window PCS 6 of Refusing 1 73 FR3V10 SV-VM

Foflure to Waonoj* Loss of RHR Event In PCS 6

FR3V WO D-LSWt-SHE

70 73 FR3V 1C3 FR3V K32

1 Operator folkjr* FALURE OF FEED FALURE OF FEED Aerator FoSure to uss LHSf In' AND. SPLL USNG MO SPU. USNG to use MSI In Feed and Sbll LPI HPI feed ond epll In Window 1 In Window 1

FSW12L FSWI2H A-L2WI-XHB-PL-0 A-L3WI-XHE-FH-0 Feed and Bleed the RCS in L2, Window 1

Feed and Bleed the RCS In L2, Window t IT PL3V i-9

Feed and Bleed Salety Vofce the RCS In 12. Removed In Window POS 6 of Refuelng I

FRJ 710 SV-W1

Failure (o Diagnose Lota of RHR Event In POS 8 IT FR3Y KQ D-L3W1-XHB

FR3V 1G3 FR3V K52

Operotor fojkr.e i FALURE OF FEEO FALURE OF FEEO Operator Failure to use LHSI In' • AND SPILL USNG AND SPLL USNG to use HHSI In Feed and SJI LPI HPI feed ond spll In Window 1 In Window 1

FSWI2. FSW12H x-L2Vl-XHB-ri-8 A-L8WI-XHE-KH-S Feed and Bleed the RCS in L2, POS 6 of Refueling

FL2N 1-14

Failure to Dioqnose Loss of RHR Event in POS 6

FL2TV1B14 D-L3W1-XHE

FhZYi 1C14 FL2TY 1D14

Operator failure FALURE OF FEED FALURE OF FEED Operator Failure to use LHSI in AND SPILL USING AND SPLL USING to use HHSI in Feed and Spill LPI HPI feed and spill in Window 1 in Window 1

FSW12L FSW12H A-L2W1-XHE-FL-14 A-L3W1-XHE-FH-14 I Feed and Bleed the RCS In L2, POS 6 of Refueling

FhZV 1-18

Failure to Diagnose Loss of Rl-R Event in POS 6

D-L3W1-XHE

FL3Y 1C18 FL21V1D18

Operator failure FALURE OF FEEO FALURE OF FEED Operator Failure to use LHSI in AND SPILL USING AND SPLL USING to use HHSI in Feed and Spill LPI HPI feed and spill in Window ' in Window 1

FSW12L FSW12H

A-L3Yr"l-XHE-FL-18 A-L2W1-XHE-FH-18 Gravity from RWST in L2, Window

Gravity from RWST in L2, POS 6 of Refueling

GL2V 1-fi

Sofety Volvo Removed in Window 1

GR3V1G2 SV-W1

_ INSUF FLOW Failure to Diagnose Operator Failure THROUGH' LOW HEAD L066 of RHR Event to establish NJECTION FLOW in POS 6 gravity feed PATH in window 1

D6-CG D-L2W1-XHE A-LStfl-XHE-G-B Gravity from RWST in L2, Window 1

Gravity from RWST in L2, PCS 6 of Refueling

00 GLBWl-10

Safety Valve Removed in Window 1

GR3WK32 SV-W1

_ INSUF FLOW Failure to Diagnose Operoto1r Failure THROUGH LOW HEAD Loss of RHR Event to establish NJECTION FLOW in POS 6 gravity feed PATH in window 1

D6-CG

D-L3W1-XHE A-LSwi-XHE-G-lO Failure of High Pressure Recirculation in Window 1

Failure of High Pressure Beoiroulation In Window i

Ct2V 1-4

Safety Valve Removed in Window 1

CL2W1N4 CL2Y 1Q4 SV-W1

INSUF FLOW FM INSUF FLOW FRM Failure to Diagnose failure of Recirculatior Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 High P Recirc HDR in Window 1

H2 PL2W1-4

D-L2W1-XHE A-L2W1-XHE-C-4 Failure of High Pressure Recirculation in Window 1

Failure of High Pressure Reoiroul&tion lm Window 1

CLSTV1-8

Safely Vat/e Removed in Window 1

CL2W1N8 CLBV 108 SV-W1

INSUF FLOW FM INSUF FLOW FRM Failure to Diagnose (failure of Recirculation Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 High P Rccirc HDR in Window 1

HI H2 PL3W1-8

D-LEW1-XHE A-L3W1-XHE-C-B Failure of High Pressure Recirculation in Window 1

Failure of High Pressuro Rooiroulation .lti..fflp

CLSWll-13

CL2W1N13 ChZyA101 3

INSUF FLOW FM INSLF FLOW FRM Failure to Diagnose ffaifcre of Recirculation Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 High P Recirc HDR in Window 1

HI PL2W1-13

D-L2W1-XHE A-L2W1-XHE-C-13 Failure of High Pressure Recirculation in Window 1

Failure of High Pressuro Reoiroula.Mon In Wlncjow 1

CL2W1-17

CL2W1N17 CL2T? 1Q17

INSUF FLOW FM INSUF FLOW FRM Failure to Diagnose (failure of Recircukitior Operator Failure LPSI PIvPS TO 3 .CHRG PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 1 High P Recirc HDR in Window 1

H1 PL2W1-17 D-L2W1-XHE A-L2W1-XHE-C-17 I— Cperolof Future u m A-LSWt-XKE-C-t D-UWI-XHC 00 a* NSLF aw FRM NSUF FLOW FRM L^ PRES S PMP-CLO LOW PRES SI PMP LOS RttR MOe 0 HOT LEGS RECR ZT ZT

i— ZL Vent Exfata Solely Volveo Fekjr-.e of Recirculation Hoi Remove In Spray In Window Window 1

PL2WN+ Operator Poire To Eolobhh Hon P Redrc H Wtldm- 1 IT rv a2»fB A-L2WI-XHE-C-8 D-UWI-XK:

NSLF RW FRM NSLF FLOW FRM U* PRES St PtP-CLO LOW PRES SI PMP 23 LOS RECri MOE 0 HOT LEOS REOR

HAS tttSHLG CL2V1C8 CLZV«B

Vent Exfate Sofoty Vol/ea illij-o of RocVciiattoo ftet Remove In Sproy In Window Window 1

VENTL12 FL2WW8 VW1 a2W1-8 Cprotor Fdkr* o)uc« to DfognOM to Ertcbfah 1 oaa of RHR Event Vl POS 6 VTwVvi™ I u I V A-L2W1-X>€-C-t3 D-tZW1-XHC rn •GIF FV.W FRM WSUF FUW FRH PRES SI PMP-CU) _.W PRES SI PMP LGS reCR.HCe Tfj HOT l£CS RECR JfflT- 7J CL2WCU asvou

Safely Vabns Fdxre of Rodtaiotbn Not R«n»v» In Spray In Window Window 1

VEN1L12 PL2W1-U Operator FoJura Faikj-e to Didgnoje To Eoloblsh Losa of RHRTvont Hah P Redrc h POS 8 W WVKtoV 1 D D aavni7 aw W7 A-L2W1-XHE-C-17 D-L2W1-XrE m w J" 00 NSUF aw FRM NSLF FLOW FRM NO LW PRES SI PVP-CLO LOW PRES SI PM? LOS REOR MOE ;o HOT LEOS REOR

H\S wsaG 1? CL2AB17 CLW1C17

Vw\t ExUta Safoty Valrts Fplkro of Recirculation htot Remova In Spray In Window Window 1

VENILQ PL2WN17 VW1 R-2W1-I7 Failure to Diagnose Operator Failure Loss of RHR Event to Establish in POS 6 Recirculation Spray in W1 i r~s

PL2W1X4 D-t_2W1-XHE A-L2W1-XHE-P-4

FAILURE OF OUTSIDE FAILURE OF INSIDE SPRAY RECIRCULATION! 'SPRAY RECIRCULATION

F2LPSD F1LPSD PL2V1N8

Failure to Diagnose Operator Failure Loss of RHR Event to Establish

Wi in POS 6 Recirculation Spray in W1 T^\

PL2W1X8 D-L2W1-XHE A-L2W1-XHE-P-8

FAILURE OF OUTSIDE FAILURE OF INSIDE SPRAY RECIRCULATION! SPRAY RECIRCULATION

F2LPSD F1LPSD PL2V/1N13

Failure to Diagnose Operator Failure Loss of RHR Event to Establish in POS 6 Recirculation I Spray in W1

PL2V1X13 D-L2W1-XHE A-L2W1-XHE-P-13

FAILURE OF OUTSIDE FAILURE OF INSIDE SPRAY RECIRCULATION SPRAY RECIRCULATION

F2LPSD F1LPSD Failure to Diagnose Operator Failure Loss of RHR Event to Establish in POS 6 Recirculation Spray in W1

D-L2W1-XHE A-L2W1-XHE-P-17

FAILURE OF OUTSIDE . FAILURE OF INSIDE SPRAY RECIRCULATION SPRAY RECIRCULATION J

F2LPSD F1LPSD UNITY IL2W2 RL2W2 VW2 NL2W2 SL2W2 FL2W2 GL2W2 CL2W2 SEQ # END-STATE-NAMES

L2W2R6 — LOSP L2, WINDOW W2, POS R6

i @ 2 @ 3 8 CD 9 CD 10 CD 11 <2> 12 @ 13 CD 14 CD 15 @ 16 (s> 17 CD 18 CD UNITY IL2W2 RL2W2 NL2W2 SL2W2 FL2W2 CL2W2 SEQ # END-STlfVTI fl' m L2W2D6 — LOSP L2, WINDOW W2, POS D6

.$~?

1 @ 2 @ 3 @ 4 @ ¥4 5 CD 1 6 CD 7 @ i 8 @ 9 CD i 10 CD top event for L2 LOSP - L2 in window 2

II lYvqutncy CMouittlon ror UVfJ

Frequency of LOSP IT £? V / IMV oa I u

. Pu-otlon of Frequency of POS tt of o ProWbSly Probobiily W K> of Refueling Refuting RetueBng Outoge of POS » OW«n Uttt C occurs Ouloga Refusing Outoge (n wl given RIO

r^ FROB-wamo IT

(xraltort of Fnsqjeney of PC PiU « RelueBng Prebobllty t nlnsd Mohtcnenco t 'burVilliol n of Proboblftty P"S 6 of o Oralntfd F DS 6 of Refusing Ref w frig Outoge that £ occurs •OS 6 ot Drolnod that E ooars * oWenonce Oulogt Outogt h *1 given R6 ointononco Outage In wl given D6

PJRATON-flfi P0S-K6 DUVJKN-D& PHOB-W2DG Restore RHR given L2 in POS 6 - Refueling

RL£W2 m

•^1

Failure to Restore Failure to Diagnose RHR given L2 In LOSP Event in Loss of RHR 'OS 8 of Refuelinj POS 6 of Refueling POSs 3-13 •? i

W3-S A-L2W2-XHE-R-13 D-L2W2-XHE Non-Recovery of AC Power in W2

m w oo NL;$W2

NON-Recovery of AC Power in 2.62 HRS

NRAC262 Reflux Cooling in window 2

RoflK Cootng Given a 11 I POS 6 of Refuofng

Fa'lur« to Moqnose RCS Loops Isolated 1099 of RHR Evont to COUM Foilura V) POS 8 I of Reflux Cooling

SRiVKSVJ SR3W1G00 D-L8Vf£-IHB

Operator Foiluro INSUF FLOW TO to Feed SCs In ! SG FRM AT LEAST VIWow 2-U 1 AFW PUMP

SR3\ 'K33 SR3V X111 A-Lewe-xaz-s'-ia

Oporator Fdlure FALLRE OF I FAL TO CLOSE FAILURE OF Operator torture to Bleed tha SECONDARY SDE BOTH PORVS SECONDARY SIDE to eatdbliah SOJ 1 ^ven L2 HEAT REMOVAL t-€AT REMOVAL reflux after PRT rupture

PORV1 0SM1T23 A-Lewe-XHE-81-13 A-L2W8-XlCE-3e-13 Reflux Cooling in window 2

Reflu< Cooing Given o L2 Ii. POS 6 of Refusing

Foilure to Dfoqnose RCS Loops Isololed Loss of RHR Evsnt 1o Come FoJurs h POS 6 of Reflux Cooling;

"5" SR3V.K0O SR3VK3U D-LeWB-XHB

Operolor Failure ,. INSUF FLOW TO to Feed SGs h ! SG FRM AT LEAST Window 2-L2 1 AFW PUMP

SMV'KH SR3V 1G11 A-Leive-xnE-sr-i7

Operator Failure FALLRE OF FAL TO aOSE FALURE CF Operolor failure to Steed the SECONDARY SOE BOTH PORVS SECONDARY SIDE to estcMsh SCs I given LI HEAT REMOVAL HEAT REMOVAL reflux otter PRT rupture

SSH1T23 PORV1 8SHIT33

A-LBWe-XHE-88-17 A-L2TTS-XHE-32-17 Feed and Bleed the RCS in L2, Window 2

Feed end Bleed the RCS In L2, Wndow 2

FL2"1J 2-5 1 Food aid Bleed Solely Vave the RCS In 12, Removed In Window POS 6 of Refuelng 2 A FR3W0O SY-1T2

I Fdkre to Diagnose Loss of RHR Event In POS 6

FR3VJK0O n D -LSW2-XHB

FR3V •33 FR3\ KJ2

1 1 1 1 Operator fjHuce FALURE OF FEED FALURE OF FEED Operator Faiuro to uss LHSI Irt AND SPLL USMO AND SPli USNG to use HHSI In Feed and Spli IPI HPI feed and epll In Window? In Window 5

() A A r^ FSW12. FSW12H A-LSW2-XME-rL-0 A-L3W2-XHB-FH-0 Feed and Bleed the RCS in L2, Window 2

Feed and Bleed th« RCS tn L2, Window 2 IT PL2V 2-9

Feed end Blew) Saloty Vofce the RCS In L2, Removed In Window POS 6 of Refusing 2

FRJ tftt

mi o to Foiluro to Dlognoso LOSB of RHR Event In POS 6 V FR3VX30 D-LSW2-XHB

FR3V IG2

Operator ftfkjro FALURE OF FEED Operato1r FoJure AND SPIL USNG to use fflSI In HPI feed ond soil In Window 2

FSW12. FSW12H

A-L2WS-XHE-rL-8 A-LEW2-XHB-PH-8 I Feed and Bleed the RCS in L2, POS 6 of Refueling

FL2W 3-14

Failure to Diagnose Loss of RHR Event in POS 6

FL21V 2B14 D-L2W2-XHE

FLSVt 2C14 FL21V 2D 14

Operator failure FALURE OF FEED FALURE OF FEED Operator Failure to use LHSI in AND SPILL USING AND SPLL USING to use HHSI in Feed ond Spill LPI HPI feed and spill in Window 2 in Window 2

FSW12L FSW12M A-L2W2-XHE-FL-14 A-L2W2-XHE-FH-H Feed and Bleed the RCS in L2, POS 6 of Refueling

FL3tt|3-18

Failure to Diagnose Loss of RHR Event in POS 6

FLStVlSBlS D-L3W3-XHE

Operator failure FAILURE OF FEED FALURE OF FEED Operator Failure to use LHSI in AND SPILL USING AND SPLL USING to use HHSI in Feed and Spill LPI HPI feed and spill in Window 2 in_Window 2

FSW12L FSW12H

A-L2Yf2-XHE-rL-18 A-L3W3-XHE-FH-18 Gravity from RWST in L2, Window 2

Gravity from RWST in L2, POS 6 of Refueling P r 1 GLSV 3-B 1 Safety Valve Removed in Window 2

L^ A GR3WK32 SV-W3

1 1 INSUT FLOW Failure to Diagnose Operator Failure THROUGH LOW HEAD L066 of RHR Event to establish EJECTION FLOW in POS 6 gravity feed APAJH inA window 2 D6-CG n D-L2WB-XHE A-L2W8-XHE-G-B Gravity from RWST in L2, Window 2

Gravity from RWST in L2, POS 6 of Refueling

GLBnW 1-10

Safety Valve Removed in Window 2

GR3WK32 SV-W3

_ INSUF FLOW Fa'kjre to Diagnose Operator Failure THROUGH LOW HEAD LOBS of RHR Event to establish NJECTION FLOW in POS $ gravity feed PATH in window 2

D6-CG

D-LSW3-XHE A-L2TT2-XHE-G-1D Failure of High Pressure Recirculation in Window 2

Failure of High Pressuro Booiroulakion In Wljjcjow g

ClZtiZ -4-

SafetyI Valv e Removed in Window 2

L2W2CPZM CL2Y 204 SV-W2 CL2W2N4

INSUF FLOW FM INSUF FLOW FRM Failure to Diagnose (failure of Recirculation! Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 2 High P Rccirc HOR in Window 2

HI H2 PL3W2-4 D-L2V2-XHE A-L2W2-XHE-C-4 Failure of High Pressure Recirculation in indow 2

Failure of High Pressure Heoiroulfttion In Window S

CL2Y 2-B

Safety Valve Removed in Window 2

L2W2CPZM CL2V 208 SV--W2 CL2W2N8

INSUF FLOW FM INSUF FLOW FRM Failure to Diagnose (jaitare of Recirculatior Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 2 High P Recirc HDR • in Window 2

H2 PL21VS-8 D-L2W2-XHE A-L2W2-XHE-C-B Failure of High Pressure Recirculation in Window 2

failure of High Pressuro RooiroulaMon In Win

I CL2W2-13

L2W2CPZM CLZtiHQi3 CL2W2N13

INSUF FLOW FM INSUF FLOW FRM Failure to Diagnose ffaikjre of Recirculotior Operator Failure LPSI PMPS TO 3 CHRO PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 2 High P Rccirc HDR in Window 2

H1 H2 PL2W2-13 D-L2W2-XHE A.-L2W2-XHE-C-13 Failure of High Pressure Recirculation in Window 2

Failure of High Pressure Recirculation In Wtpdow S

CL3VW2-1 7

L2W2CPZM CL2W2017 CL2W2N17

INSUF FLOW FM INSUF FLOW FRM Failure to Diagnose failure of Recircukitior Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 2 High P Recirc HDR in Window 2

HI H2 PL2W2-17

D-L2W2-XHE A-L2W2-XHE-C-17 Failure of Recirculation Spray in Window 2-cause HPR failure

Failure of Rcolroulation Spray In

PLOT 3-4

loss Of HPSH du i to opon contdnmer t

L2W2CPZM PR3VK) CON-VFC-RP-COREM

Falure to Diagno30 Operator Falure Loss 0/ RHR Event to Establish in POS 6 Recirculation Spray in W2

PR3V1G0

D-L2W3-XHE A-L2W2-XHE-P-4

FALURE OF NSDE FALURE OF OUTSDE $PRAY RECIRCULATION IPRAY RECIRCULATION

F1PSD F2LPS0 Failure of Recirculation Spray in Window 2-cause HPR failure

Tailuro of Reolroulntion Spray In —Wlnriow-3 •

PL3Tta-8

loss of HPSH du i to open contoinmer L m >—> L2W3CPZM PR3V10 to CON-VFC-RP-COREM

Failure to Oioanose Operator Foilure Loss of RHR Event to Establish in POS 6 Recirculation Sprov in W2

PR3W1G0

D-L3W2-XHE A-L2W2-XHE-P-8

FALURE OF NSDE FAILURE OF OUTSDE $PRAY RECRCULAT10N IPRAY RECIRCULATION

F1PSD F2LPSO Failure of Recirculation Spray in Window 2-cause HPR failure

Pailuxo of Reoiroul&Uon Spray In —Windoiadow 88

PLBWJ-13

I loss of HPSH . du i to open contdnmer t w L3W2CFZM PR3V10 CON-VFC-RP-COREM I Failure to Diaanose Operator Failure Loss of RHR Event to Establish in POS 6 Recirculation Spray in W2

PR3Vf1G0

D-L3W2-XHE A-L2W2-XHE-P-13

FALURE OF NSDE "ALURE OF OUTSDE SPRAY RECRCUATION JPRAY RECIRCULATION

F1PSD F2LPSO Failure of Recirculation Spray in Window 2-cause HPR failure

FSUUTO of Recirculation Spray In —Wlariow 8

Ptew i-17

loss of HPSH du i to open contoinrner t i L3W2CPZM PR3 VK> CON-VFC-RP-COREM

Failure to Oiagiose Operator Failure Loss of RHR Event to Establish in POS 6 Recirculation ' Sprov in W2

PR3V f1G0

D-L3W3-XHE A-L2W2-XHE-P-17

FALURE OF NSDE rALURE OF OUTSDE PRAY RECRCULATION iPRAY RECIRCULATION

F1PSD F2LPSO Correnotlon to Recirculation FTs (c and P) in Windoir

4-

L3WSCFZM

Operator Failure Pailuro to Diagnose FAILURE OF FEED [to Cross Connect] A^D SPILL USING H >1 .088 of Power Evefrt IWrST Given successful in Window Z lirrl

FSW12H D-L2W2-XHE A-L2W2-XHE-X Operator Foluro to Enlobbh Ugh P Redrc Ini Wlgtay 2 . "\

ua»2D+ CL2V2A4 A-L2WJ-XHE-0-4 D-L2W2-XHE

NSUF aw FRM NSUF FLOW FRM LjV PRES S) PM>-CU0 LOW PRES SI PMP LOS REOR MOE TO HOT LEOS RECR .MS"

rv\S KKSHLG O.OT2C4 CLZV2B+

Vent Exists Safety VOI/M Fpllu-a of RecV-cUotlon Nat Remove In Sproy h Window Window 1

VENTltt FL2W2N4 VW2 PL2W2-4 0.2W2NB

Fcikro to Diagnose. j»e of RHR Event In POS « I a C12Y2AO aw 208 A-L2W2-XHE-C-8 D-LZW2-XHE CD J* NSUF RW FRM NSUF ROW FRM LlV PRES St PM>-ao J.OW PRES SI PMP LOS RECf< M0£ TO HOT LEOS RECR £L HOPE

HAS IttSHLG 02V2Cfl CL2V2B8

Vent Exhto Safety Vat/As ilU-a of Recirculation Not Remove In Spray In Window Window 1

VENTL12 R-2W2Nfi VW2 PL2W2-8 Operator Foluro •ofcre to MognoM o« or RH? £v«nt rt* P Roelrc In POS 8 ..tfWlrrjOT-2 Q "Q aw 013 A-l2W2-Xr£-C-t3 D-L2W2-XHE

WSUF RW FRU NSLF aOW FRM L+ PRES SI PMP-CLD LCW PRES SI PWP LOS racR Mce 0 HOT LEOS RECR ZT CL2W Bli

Vent Main Safoly Vorvoa F. ikjro of Reelrcubtlon Not R«nov« h Soroy In Window Window I 2

VENTIT2 PL2W2N13 Operator FoJure roflure to DIognOM Jo EstobSsh oe» of RHR Event HWi P Retire In POS 8 In WcsteB 2 n n A-LSW2-XrE-C-17 D-L2W2-XHE

NSIF FLW FRM NSLF aCW FRM Lt PRES SI PMP-aO LCW PRES SI PMP LOS RECR MCE • 0 HOT LEOS RECR n n

Vent Exbto Safety VoKies Fiijro of RedrcufaUon Not Remove In Sproy In Window VrVxtow I 2

vom.n VW2 PL2V2N4

Failure to Diagnose Operator Failure Loss of RHR Event to Establish In POS 6 Recirculation Spray in W2

D-L2W2-XHE A-L2W2-XHE-P-4

FALURE OF OUTSIDE FAILURE OF INSIDE SPRAY RECIRCULATION ISPRAY RECIRCULATION

F2LPSD F1LPSD PL2V2N8

Failure to Diagnose Operator Failure m Loss of RHR "Event to Establish in POS 6 Recirculation Spray in W2 7~\

PL2V2X8

D-L2W2-XHE A-L2W2-XHE-P-8

FALURE OF OUTSIDE FAILURE OF INSIDE (SPRAY RECIRCULATION ISPRAY RECIRCULATION

F2LPSD F1LPSD PL2V.2N13

Failure to Diagnose Operator Failure m Loss of RHR Event to Establish in P05 6 Recirculation Spray in W2

PL2Vi2X13

D-L2W2-XHE A-L2W2-XHE-P-13

FALURE OF OUTSIDE FAILURE OF INSIDE 1SPRAY RECIRCULATION BPRAY RECIRCULATION

F2LPSD F1LPSD i PL2V.2N17

m Failure to Diagnose Operator Failure Loss of RHR Event to Establish b in POS 6 Recirculation Spray in W2

•4

PL2W2X17

D-L2W2-XHE A-L2W2-XHE-P-17

FALURE OF OUTSIDE FAILURE OF INSIDE ISPRAY RECIRCULATION ISPRAY RECIRCULATION

F2LPSD F1LPSD UNITY IL2W3 RL2W3 VW3 NL2W3 FL2W3 GL2W3 SEQ # END-STATE-NAMES

L2W3R6 — LOSP L2, WINDOW W3, POS R6

1 @ 2 3 @ 4 CD 5 CD 6 @ 7 CD 8 CD 9 (s> 10 CD 11

L2W3D6 — LOSP L2, WINDOW W3, 'OS D6

1 <§> 2 @ 3 <§> « 4 @ 5 CD 6 @ 7 @ 8 CD UNITY IL2W3 RL2W3 VW3 NL2W3 FL2W3 GL2W3 SEQ # END-STATE-NAMES

L2W3R10 — LOSP L2, WINDOW W3, POS R10

1 2 @ 3 @ 4 CD 5 CD 6 m 7 CD 8 CD 0\ 9 10 CD 11 © 12 CD I top event for L2 LOSP - L2 in window 3

11 rrvqutney dloulttlon for

n,t)r»

Frequency of LOSP

V / IUW OS pn8«-ia

7*~

,. OircOon ol Frequency of POS 10 of 0 Prcdoblity » X) of Rifwflng Refuolwj Refuting Outoge of POS B oUn trnt E occurs Ouloja RefueEn) CU09J In Hi rjtven RK)

U ma POS-R» PB0D-W3B10 LJ

DU-OllOA ol Fretyency of PCK.t'of'.'o Refuting ProboMHy [ -dried Mrtitontnes . ' ttjrotlon of ProboNDty Pi S 6 of o Drolned F OS 6 Of fefuekq Refueling Oulogo that C occurs >0S 6 ol Drolneo' that E oecirs oWenonce Outoge OiAog« In *1 grwn R8 alntenonce Outoge in Hi oVtn 06

REFia P0S-R8 PB0B-W3D0 POS-C« Restore RHR given L2 in POS 6 - Refueling

w

00

Failure to Restore Failure to Diagnose Loss of RHR RHR given L2 In LOSP Event in POSs 3-13 >0S 6 of Refuelin; POS 6 of Refueling

W3-S A.-L2W3-XHE-R-4 D-L2W3-XHE Safety Valves Not Removed in Window 3

Safety Valves Not Removed in Window 3

Pressurizer Pressurizer Safety Volves Safety Valves Removed in W3R6 Removed in W3R6

PZR-SV-REM0VE0W3 PZR-SV-REM0VEDW3 Non—Recovery of AC Power

o NL;:W3

Non-Recovery of AC Power in 3.48 HRS

NRAC346 Reflux Cooling in window 3

RefliK Coofng Given o RHR3 I POS 6 of R«fuafng

Failure to DTognose RCS Loops Isolated loss of RHR Evont to Cause Falura h POS 6 of Reflux Cooing

SR3V K3W V D-L8Wa-IHB SR3WBO0

Operator Failure INSUF FLOW TO to Feed SG9 h fe SG FRM AT LEAST Window 3-L2 1 AFW FUP

UM23 SR3V 'KJ3 0 A-Leif3-XHE-8r-S SRW1G11

Operator Follure FALLRE OF FAL TO aOSE FALURE CF Operator foluro to Bleed the SECONOARY SDE BOTH PORVS SECONOARY SIDE to estcbtsh SGs I gfvcn L2 HEAT REMOVAL HEAT REMOVAL reflux otter PRffugtura

S9HH23 P0RV1 8SHWS3 A-L21T3-XHE-S1-5 A-UK3-XHB-S2-3 Reflux Cooling in window 3

Refkjt Coofng Given a RHRJ I POS 6 of Refuelng

Failure to Diagnose RCS Loops Isolated L0S9 of RHR Event 1o Cause Falure h POS 6 o< Refk« Coofng

Q TT SR3KK00 SR3V KSVJ D-LeWS-XB\^_^ B

Operator Folluro ,. INSUF FLOW TO to Feed SGs h I SG FRM AT LEAST Wndow 3-L2 1 AFW FUP ZJ SR3VK53 SR3V 1G11 A-teW3-XHE-aF-B

Operoror Folk™ FALLRE OF FAl TO CLOSE FALURE OF Operolor folure to Bleed the SECONOARY SOE BOTH PORVS SECONOARY SIDE to eatebfah SGs 1 given L2 HEAT REMOVAL rEAT REMOVAL reflux after PUT rupture

PORV1 A-L2W3-XHE-31-8 A-UW3-XHB-S2-8 Feed and Bleed the RCS in L2, Window 3

Feed and Bleed th« RCS In L2, Window 3 IT ptara-*

Food and Ko»d Salrty Vaf/o tho RCS In L2 Removed In Window

FR3/10 ffV-1T3

M

Fotluro lo Nogrxwo u Loss of RHR Event FR3V1GO D-L3W3-XHB

FR3V 1G3 1? FR3\ K32 f" I Operator fcflu'*.' FALURE OF FEEO FALIRE OF FEEO Operator Fotor* to use LHSI In ' ANO SPIL USMO ANO SPU. USW5 to use KHSI In Feed and Sbll LPI HPI feed and soil h WMowJ A In Window *3 O FSW12. FSW12H A-L2T»3-Xlffi-n--* A-L3W3-XHB-FK-i Feed and Bleed the RCS in L2, Window 3

Feed and Bleed tho RCS In L2, Window 3

PL20V 3-7 1 Food and Bteed Saloty Veto the RCS In L2 Removed fn Window 3 A 0FR3*» 8V-1T3

Fdkro to Waonoso Loss of RHR Event 4*. A FR30V KO I>-L2W3-XHB

FR3V 103 FR3V IG2

1 1 Operator fplkr* . FALURE OF FEED FALURE OF FEED Operator FoBur* to ma LHSI In ANO SPLL USNG AND SHI USNG to use HHSI In Feed and Sell LPI HPI feed and soil __h_Whdow_5_ A InA Window 3 FEW 12. FSW12H A-LSW3-XHE-rL-7 A-L3H3-XHB-PH-7 Feed and Bleed the RCS in L2, Window 3

Feed and Bleed tho RCS In 12

43-1 0

Fa'kre to Dkignosn Loss of RHR Event A TL20H 3B1 0 D-L2W 3-XB E

FL2V 3C10 0 FL21T 3D1Q

1 1 1 Operator ftfkre . TALURE OF FEED FALURE OF FEED Operator Failure lo use LHSI in ' AND SPLL USNO AND SPtl USNG to use HHSI In Feed and Sjll LPI HPI reed and epll hA Window 3 A A In A Window 3 TBHMl F8W34H A-LSW3-XHZ-FL-10 A-UW3-2CHB-rH-10 Feed and Bleed the RCS in L2, Window 3

Feed and Ble»d the RCS In L2

nzrt 3-12

Failure to Dkranoee u Loss of RHR Event D-UW3-XHB

FL2V 3CIfc FL8H 3D12

Operator fakr?. TALURE OF FEEO FALURE OF FEED Operator FoJure to uso LHSI In ANO SPU USNC ANO SPlI USNG to use HHSI In Feed and Sell LPI HPI teed and soil try Wv&vJ In WindowS

rstrait F8W34H A-LSW3-XHE-PL-12 A-L2tt3-XHE-rH-12 Gravity from RWST in L2, Window 3

Gravity from RWST in L2,

£ GLBY 3-0 -J Safety Valve Removed in Window 3

GR3V(1G2 SV-W3

INSUF aow Fa'Kire to Diagnose Operator Foilixe THROUGH LOW HEAD Loss of RHR Event to establish NJECTK3N FLOW gravity feed PATH in window 3

D6-CG

D-L2W3-XHE A-L2W3-XHE-G-5 Gravity from RWST in L2, Window 3

Gravity from RWST in L2, m Q GLCT 3-8 00

Sofety Valve Removed in Window 3

GR3\f1G2 SV-W3

_ INSUF aow Failure to Diagnose Operato1r Failure THROUGH LOW HEAD L068 of RHR Event to establish EJECTION FLOW gravity feed PATH in window 3

D6-CG D-L81T3-XHE A-L^W3-XHE-G-B UNITY IL2W4 RL2W4 VW4 NL2W4 FL2W4 GL2W4 SEQ # END-STATE-NAMES

L2W4R6 LOSP L2, WINDOW W4, POS R6

1 2 @ 3 @ 4 OK 5 CD 6 7 OK 8 9 @on 10 CD 11 12 CD UNITY IL2W4 RL2W4 NL2W4 SL2W4 FL2W4 SEQ # END-STATE-NAME:J

L2W4D6 — LOSP L2, WINDOW W4, POS C 6

tn 1 <§> 2 <§> 3 <§> 4 @ 5 CD 6 @ 7 @ 8 CD UNITY IL2W4 RL2W4 VW4 NL2W4 FL3W4 GL2W4 SEQ # END-STATE-NAMES i L2W4R10 — LOSP L2, WINDOW W4, POS RV

1 @ ® 2 <8> 3 @ « 4 OK 5 CD 6 7 OK I 8 CD 9 ® 10 CD 11 1 12 CD

*«* top event for L2 LOSP - L2 in window 4

II rr*QU«noy Cutouliuon for

Frequency of LOSP

\ / IUTTLOS FRS4-U

. (Xrotlon ol Frequency of POS X) of o Protrcbifily Prcbobitly bs tt of (Wilding Refuehno, Refueling Outoge of POS T) Oiven that l£ occurs Outogs Retuelnj Outooe In wl given RIO

U WRAHON-RIO REFUa PBOB-lfJBlO u

. Ouatlon ol Fnacuency of POS' B «f d Reluefru ProbaMHy Cfoined l&intonenco . uwVotlon of PrcooNWy P*S 8 of 0 O/olned rtos 8 of tefiKln? Refuting T Oulogo (Ml E occurs (OS 6 ol Orolned thot E ocort ^oWenonce Outage r Outooa h *1 given R8 |aMenonce Ouloge In HI gVcn 06

PR08-TMH8 TROB-W4D8 Restore RHR given L2 in POS 6 - Refueling

RL2W4 m

Failure to Restore Failure to Diagnose Loss Of RHR RHR given L2 In LOSP Event in POSs 3-13 >0S 8 of Refuelin; POS 6 of Refueling

W3-S A-L2W4-XHE-R-5 D-LEW4-XHE Non-Recovery of AC Power

tn

NL^:W4

Non-Recovery of AC Po-wer in 4.55 HRS

NRAC455 Reflux Cooling in window 4

Reflux Cooing Sven o RHR3 l.i POS $ of R«fuetng

Foiluro to Koqnoso RCS Loops Isolated LOM of RHR Event to Cause Folure h POS 6 of Rofkix Cootng

1? SR3VMG0uD IBO-wt SR3VK3V3 D-LeW4-XHE

Operator Folluro _ INSUF FLOW TO to Feed SC9 H 1 SG FRM AT LEAST Window 4-L2 1 AFW PUMP

SR3VK33 SR3V1C11 A-L8ir«-iHB-sr-a

Operator Fotkro FALLRE OF FAL TO aOSE FAILURE CF Operator folure to Bleed the SECONDARY SEE BOTH PORVS SECONDARY SIDE to estaMah SCa I given L2 HEAT REMCWL tCAT REMOVAL reflux after PRTjtPjOT

asmr-i PORV1 A-L8ff*-XHi:-St-3 A-L2W4-XHE-Be-5 Reflux Cooling in window 4

Rafktt Cooing Given o RHRJ lit POS 6 of Rofuetng

SL2*4-a

Failure to Dfcwnose RCS Locos Isololed L099 of RHR Event to Cou9e Failure In POS 6 of Roflux Cooling

Q T7 SR3W1G0u0 I30-TU SR3V K3W D-LMU-XH\ / E

Operator Failure INSLF FLOW TO to Feed SGs In I SG FRM AT LEAST Window +-L2 1 AFW PUMP Q SR3\

A-L8W4-IHB-sr-a

Operotor Foiluro FALLRE OF FAL TO CLOSE FAILURE OF Operator failure to Bleed the SECONDARY SIDE BOTH PORVS SECONDARY SIDE to establish SGs I given L2 HEAT REMOVAL hEAT REMOVAL reflux ofter PRr JWjix-a

ssmu PORV1 3SHW4

A-L2W*-XHE-Sl-8 A-LZW4-XHE-ae-B Feed and Bleed the RCS in L2, Window 4

Feed and Bleed th« RCS In L2, Window 4 IT FL21 4-8

Teed and E»«l Saloly VoVo tho RCS In L2 Removed In Window 4

FR3V10

I Failure to Wognose Loss of RHR Event

nFR3VK0 D-LSWi-XHB

FR3V 103 1£ FR3\ K52

Operator fptor> TALURE OF FEED FALURE OF FEED Operato1r Falur* lo UM) LHSI Irt ANO SPtI USNG ANO SPU. USNG to use WSI In Feed and Sill LPI HPI feed and soil In WWtowM In Wlndo#4

FEW12L FSWttH A-lZW4-XHB-fL-0 A-UW*-XHE-rH-8 ed and Bleed the RCS in L2, Window 4

Feed and Bleed DM RCS tn L2, Window 4

PL2V4-8

Foed and Howl Salety Veto* tho RCS In L2 Removed In Window 4 73 FR3V» ffY-Wi

Foikro to Dkignoso Loss of RHR Event

FR3V KO D-WWt-XHB

FR3V X53 FfUY 102

1 1 Operator folKr.* TALURE OF FEEO FALURE OF FEEO Operato1r FaSir« to use LHSl In1 AND SPLL USMO AND SPLL USNG to use HHSI In F««d and Spll LPI HPI Vi Wlndow4 feed and spll A In Window % n FSWO. FSW12H A-L3W4-XHB-FL-B A-L2W*-XHE-rH-8 Feed and Bleed the RCS in L2, Window 4

Feed and Hood the RCS In 12 ZJ

FaiKre to Diagnose u Loss of RHR Event D-L3W4-XHE

ZJ JL2IT IDiO

Opwotor feikjr.e ,' FALURE OF FEED FALURE OF FEED Operator Falure to uso LHSI In ' AND SPLL USING AND SPLL USMG to use HHSI In Feed and Sbll LPI HPI feed and spll In Window^ In Window %

FS1T34H A-LSWi-XHS-FL-lO A-UlU-XHZ-ni-lO ZT-Hi-XHX-tttSn-•Y sr-ai-aHX-tM2i-Y

V » MOPIIM v* 0t. <*°pujM "I Ijds puo p»ej IdH idi "1 ISHH »sn o) 3MS0 TldS ONV ONSfl TldS GNV 1HS PUD pssj 033J JO ayrnvj 033J JO symvj 1 «Jfi(BJ JO)O.»

3HX-i »&\- a Ur 3»Su* MCTJ )i»A3 a« jo sson OCOUDOJO o) «-in|]Oj

31--tUBlt! 3

[xjCHfl poo fxioj

f Mopui/v\ 'zi ui S3d 9l|} P99|g PUD p88J Gravity from RWST in L2, Window 4

Gravity from RWST in L2 Q CO GLBY 4-B

Safety Valve Removed in Window 4

CR3V1G2 SV-W-t

INSLF FLOW Failure to Diagnose Operator Failixe fl>«0UGH LOW HEAD Loss of RHR Event to establish NJECTION FLOW gravity feed PATH in window 4

D6-CG D-L8*T4-XHE A-Lsta-XHE-G-0 Gravity from RWST in L2, Window 4

Gravity from RWST in L2 m hi GLCT 4-B

Safely Valve Removed in Window 4

GR3VV32 SV-W4

_ INSUF FLOW Failure to Diagnose Operator Failure THROUGH LOW HEAD Los6 of RHR Event to establish EJECTION FLOW gravity feed PATH in window 4

D6-CG D-LSVU-XHE A-L2W4-XHE-G-8 Appendix E.8 Event Trees and High Level Fault Trees for Unit 1 BIackout(L3)

E-453

•tw; w?mm•mzm •^w^mj^v-m^ UNITY IL3W1 RL3W1 VW1 NL3W1 SL3W1 1 FL3W1 GL3W1 CL3W1 SBQ # END-STATE-

L3W1R6 — LOSP L3, WINDOW W1, POS R6

1 @ 2 @ 3 @ 4 CD 5 CD 6 CD 7 (9> 8 CD 9 CD 10 CD 11 12 16 < 17 CD 18 CD CO

Q pp pp <§;© @> DO® OO

=tfe *H CJ CO ^ ID CD i> CO Of w CO

CO u

CO CD fa Q

O DL

CO 525 8

fo

CO o

to Q

CO n

D

E-455

:»• W top event for L3 LOSP - L3 in window 1

II frequtney calouiiilon rot U*t 7^ i Frequency of LOSP O h5 PBBQ-1V^^3/ IUB OS a

Duration Of frequency of POS tj Of 0 Protoemy ProboWly P« » of Rifudlng Refuenng Refusing Outage of POS O Owen that IE occurs Cutogo Refusing Outoge In HI r/wn RIO

U DURMK>N-RX> IT

Duration of Freqjency of 6 «f • a RetueBng ProboMty t loJned Motntonenoo . Duration of PiobofcHty P4S 6 of o Orrjtaed f OS 6 of Rofuelng Refuting Outage that E occurs •OS 6 St Drained that E occiri Maintenance Outoge Outoge In *t given R8 t oWenonco Outage In Hi gV/en 06

REREL POS-R6 Restore RHR given L3 in POS 6 - Refueling

RLdWl

Failure to Restore) Flailure to Diagnose! RHR elven L3 In LOSP Event in }>0S 6 of Refuelin PJOS 6 of Refueling|

A-L3W1-XHE-CW-4:

W3-S A-L3W1-XHE-R-4- D-L3W1-XHE Non-Recovery of AC Power in 144 min. of LOOP

00 NL:WI

Non-Recovery of AC Power in 2.00 HRS

NRAC200 Reflux Cooling in window 1

RsffcK Cooing Given o L3 I POS 6 of R»fuetng

3L3W1-13

FolXro to Dfoqnose RCS Loops Isolated Low ot RHR Event 10 Coua« Folure Vl POS 6 of Reflux Cootng

SR3VIGVJ SR3WB00 IS0-W1 D-L31U-XHE

Operator Foiluro ._ INSUF FLOW TO to Feed SGs h I SG FRM AT LEAST Window I-L3 1 AFW PIMP

LSW1 SR3VK53 SRSi K11 A-L3W1-XHB-SP-13

Operator Follure FALLRE OF FAL TO aOSE FAJLURC OF Operator folure to Bleed Iho SECONDARY SDE BOTH PORVS SECONDARY 3DE to eatdblsh HEAT REMOVAL HEAT REMOVAL reflux otter SGs I given L2 PRKcypJura

SSHWI P0RV1 ssmi A-L31T1-XB8-81-13 A-L3W1-XHB-B2-13 Reflux Cooling in window 1

Refktt Coorng Given o L3 I POS 6 of Rofuetno,

Fofluro lo Hoqncse RCS Loops tooloted Low of RHR Event to Cause Foiure In POS 6 of Reflux Cooing

SR3V K313 \^_^/ SR2V.KOO D-L3W1-XHE

Operator Failure ,. INSUF FLOW TO to Feed SOs In ! SG FRM AT LEAST Window 1-L3 1 AFW PLWP

LSW1 SR3V1G3 SRW1G11 A-L3Wl-IHB-Sr-i7

Operotor rFailur e FALLRE OF FAL TO aOSE FAILURE OF Operator foiure to Bleed the SECONOARY SOE BOTH PORVS SECONOARY SOE to establish SGs I given L2 HEAT REMOVAL HEAT REMOVAL reflux otter PRTjupjure

SSHWI PORV1 SSHiVl A-t3Fl-XHB-Sl-i7 A-L3W1-XHB-82-17 Feed and Bleed the RCS in L3, Window 1

Feed and Bleed tha RCS In 13, Window t TT PLOri-s

Food and Bleed Satety VoVe the RCS In 13, Removed In Window POS 6 of Refueling 1

FR3/10 SV-W1

Fa'kre lo Nognose Loss of RHR Event In POS 8

FR3V tGO D-L3W1-XHE

FR3V 103 FR3V 102

Oporotor foOurV' FALURE OF FEEO FALURE OF FEEO Operator FoSure to use LHSI In ' AM) SPLL USMO AND SPU- USMG to use H«l In Feed and all LPI HPI feed ond spll In Window 1 In Window 1

A-L3W1-XHB-CW-0 FSWKL FSW12H

A-I.3Wl-XHB-FI.-tt A-L3Vfl-XKE-rH-0 Feed and Bleed the RCS in L3, Window 1

Feed ond Bleed th« RCS tn L3, Whdow I IT PL01 1-9 _T Feed ond Bleed Salety Valve the RCS In L3. Removed In Window POS 6 of Refusing 1

FR3/» SV-W1 m Foikre lo Wognose to Lose of RHR Event In POS B

uFR3V KO D-L3WI-3HE 1

FR3Y 103 FR3V 102

Operator f/oiXrt FALURE Of FEEO FALURE OF FEED Operator FaJuro lo use IHSI In ' ANO SPIL USNG AND SPU. USNG to use HHSI In Feed ond Sf>ll LPI HPI feed end 9ptl In Window 1 In Window 1

A-L3T1-XHB-CTT-0 FSW1X FSW12H

A-L3W1-XBB-H.-B A-WWl-XHE-rH-S Feed and Bleed the RCS in L3, POS 6 of Refueling

FL3TV t-H

Failure to Diagnose Loss of RHR Ev«nt in POS 6

FL3WIB1n4 m D-L3W1-XHE

FL3WICM

Operator failure FALURE OF FEED FALURE IO F FEED Operator Failure to use LHSI in AND SPILL USING AND SPLL USING to use HHSI in Feed and Spill LPI HPI feed and spil In Window 1 In Window 1

A-L3W1-XHE-CW-14

FSW12L FSW12H

A-L3W1-XHE-FL-14 A-L.3TY1-XHE-FH-14 Feed and Bleed the RCS in L3. POS 6 of Refueling

FL3TV 1-18

Failure to Diagnose Loss of RHR Event in POS 6

m PL3W IB18 2 D-L3W1-XHB

Operator failure FALURE OF FEED FALURE OF FEED Operator Failure to use LHSI in AND SPLL USING AND SPLL USING to use HHSI in Feed and Spill LPI HPI feed and spil In Window 1 In Window 1

A-L3TT1-XHE-CW-1B

FSW12L FSW12H

A-L3W1-XHE-FL-18 A-LaWl-XHB-FH-lB Gravity from RWST in L3, Window 1

I Gravity from RWST in L3, PCS 6 of Refilling

GL3V 1-Q

Safety1 Vah/ e Removed in Window 1

GR3WK32 SV-W1

INSUF FLOW Failure to Diagnose Operator Failure THROUGH LOW HEAD L066 of RHR Event to e3tabli8h NJECTION FLOW in POS 6 gravity feed PATH in window 1

D6-CG

D-L3W1-XHE A-L3Vfl-XHE-G-B Gravity from RWST in L3, Window

Gravity from RWST in L3, POS 6 of Refueling m 1 i r JL3W1-10 1 Safety Valve Removed in Window 1 L A GR3Vr (1G>2 SV-W1

1 1 INSUF aow Failure to Diagnose Operator Failure rHROUGH LOW HEAD Loss of RHR Event to establish NJECTION FLOW in POS 6 gravity feed PATH in window 1 A n A 06-CG D-L3W1-XHE A-L3tfl-XHE-G-10 Failure of High Pressure Recirculation in Window 1

Failure of High Pressure HooiroulRtion In modow I maO CLaWl-4

Safety Valve Removed in Window 1

CL3W1N4- CL3Y 104 SV-W1

INSUF FLOi W FM INSUF FLOW FRM Failure to Diagnose (failure of Recirculatior Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 High P Recirc HDR in Window 1

HI PL3W1-4 D-L3W1-XHE A-L3W1-XHE-C-4. Failure of igh Pressure Recirculation in Window

Failure of High Pressure ReoiroulB.Uon

Safety VaWe Removed in Window 1

CL3W1N8 CL3V 1GB SV-W1

INSUF FLOW FM INSUF FLOW FRM Failure to Diagnose (failure of Recirculatior Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 High P Recirc HOR in Window 1

H1 PL3W1-8

D-L3W1-XHE A-L3W1-XHE-C-B Failure of High Pressure Recirculation in Window 1

Failure of High Prossuro Reoiroul&tion In Wlnlovf 1

CL3W1-13

CL3W1N13 CL3-H1013

INSUF FLOW FM INSUF FLOW FRM Failure to Diagnose (failure of Recirculation Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 High P Recirc HDR in Window 1

HI H2 PL3W1-13 D-L3YU-XHE A-L3W1-XHE-C-13 Failure of High Pressure Recirculation in Window 1

Failure of High Pressure HooiroulaUon In Window 1

CL3W1-17

CL3W1JU7 CL3-W1Q17

INSUF FLOW FM INSUF FLOW FRM Failure to Diagnose (failure of Recirculotior Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 High P Rccirc HDR in Window 1

HI PL3W1-17 D-L3W1-XHE A-L3W1-XHE-C-17 Operator Fokre Foflro to Dfognou .OM of RHRHRTR EvenWt In POS 6 D 03*0* W4 A-tJrtt-XHE-C-i D-LWI1-XHE

NSLF aW FRM NSUF ROW FR« LV PRES SI PMP-CU) LOW PRES SI PIP LOS REOR MCE 0 HOT LESS REOR ZJ ZJ H»S

Vent Exfala Safety Vdvee fc lure of Redrctriotlon Hot Remova In Spray In Wlndo* Window 1

VW1 PL3WI-* Operator FoJura roluro to Wognooe Jo Estobteh .on of RHR Ever* In POS 8 In Wtatot 1 a I A.-L3WM0C-C- O-LSrVI-XrE is NSIF FLW FRM WSLF FLOW FRM LW PRES SI PMP-OD LCW PRES SI PWP LOS RECK MCE 0 HOT LEOS RECR

HXSH.G OM1CB ~n

Vent Exbta Safety Vot/es, F< fcxe- _ of Rectcubtfon I Not Remove In Sproy h Window Window I

R.3W1-8 ^

aw|Nti

Operator Fdkre o»i« to DtognoM to Eetctobh I ens of RHR Event Mgh P Rtolro h POS 6 «Whtw 1 TJ u M aswow A-UWMfrE-C-13 m WSUF ao# FRM IV FRES a PW-OD .W PRES 9 PMP LGS KCR HC£ n HOT LEGS RECR (1*5) I I HOE II ZJ

Vent ESdste Sofoty Voives jre of Roe^cufatton Not R«rr»v» Vi Sproy In Wkxfcw IMnctm 1

VENH.12 R.3WTTO I Operator Fduro Falkre to Diagnose jo Establish .ose of Rrt? Event Htf\ P Rodre In POS 6 a r m A-H.3W1-XHE-C-I7 D-Ortl-XHE is NSUF aw FRH NSUF FLCW FRM l# PRES SI PMP-aO LOW PRES 51 PIP LOS RECR MCE 0 HOT LEOS REOR

WSH.C 0-3* CT7 ajwei7

Vent Exfata Salety Vdvee Ttikre of ReclrcJallon Not Remove In Spray In Window Window 1 1

PL3W1N4

Failure to Diognose Operator Failure OPERATOR FALS c Loss of RHR Event to Establish TO ISOLATE THE Recirculation in POS 6 Sproy in W1 CANAL IN L3

'$

PL3V1X4 D-L3W1-XHE A-L3W1-XHE-P-4 A-L3W1-XHE-CW-4

FALURE OF INSDE FALURE OF OUTSDE % SPRAY RECIRCULATION SPRAY RECIRCULATOH

FLPSO F2LPSO PL3 V1N8

Failure to Diagnose Operator Failure OPERATOR FAILS Loss of RHR Event to Establish TO ISOLATE THE m in POS 6 Recirculation CANAL IN L3 Spray in W1

PL3V1X8

D-L3W1-XHE A-L3W1-XHE-P-8 A-L3W1-XHE-CW-4

FALURE OF INSIDE FALURE OF OUTSIDE SPRAY RECIRCULATION SPRAY RECIRCULATE 4

F1PSO F2LPSO Failure to Dioqnose Operator Failure OPERATOR FALS Loss of RHR Event to Establish TO ISOLATE THE In POS 6 Recirculation CANAL IN L3 Sproy in W1

D-L3W1-XHE A-L3W1-XHE-P-13 A-L3W1-XHE-CW-4

FALURE OF INSDE FALURE OF OUTSDE SPRAY RECIRCULATION SPRAY RECIRCULATE

FLPSO F2LPS0 PL3W1N17

Failure to Diaqnose Operator Failure OPERATOR FAILS Loss of RHR Event to Establish TO ISOLATE THE in POS 6 Recirculation CANAL IN L3 Spray in W1 00

PL3V1X17

D-L3W1-XHE A-L3W1-XHE-P-T7 A-L3W1-XHE-CW-4

FALURE OF INSIDE FALURE OF OUTSIDE SPRAY RECIRCLLATIOH SPRAY RECIRCULATIO

F1PSD F2LPS0 w -2- •< I w

Q QPQ QQQ QQ QQ W

<

CM

CO -J CJ

CO CD CO •J C£ C5 (/) O CM Q_ CO (N

CO O 2/1 Q

CO ro

00 O

CM CD CO or: CM ro

CO t-4

!5 S3

E-479

• /-•ft-c; %fe; ^x*rwm> UNITY 1L3W2 RL3W2 NL3W2 SL3W2 FL3W2 CL3W2 SEQ # END-ST\TI

L3W2D6 — LOSP L3, WINDOW W2, POS D6

m 1 @ 2 @ 3 @ 4 @ 5 CD 6 CD 7 @ 8 @ 9 CD 10 CD I top event for Lo LOSP - L3 in window 2

II rt«QU«noy Ciloulttion for L3Y3

Fr«oji»nw of LOSP

\ / IWTf OS PRSQ-W

7T

. Dirotlon ol Frtqusncy of POS » Of 0 ProtaMity PrcbobMy PbS tt of RtfudVig Rtfuttng Rtlustog Outoo) ol POS O Owen trot t occurs Oulojj R«[ucfn) OAooo IIn Kl oiwn RIO

u DURATION-RIO REFOQ. POS-fiK) FRAC-POStO uILJW.Ct

txrotkm ol FreUJtncv cf PCte' f) of d RalMlng ProbobHty C iftud Matntcoonco . t>uVal/on of PioboMlty PoS lolo Orolned F 3S 8 of fiatuttn) Refuemg Oulogo (hat E occurs •OS 6 of Drained thai E oocu-i KotnUnoncG Outcqa Outojt In vl ojwn RB ^ olrrtenonce Outage Vi wl jVen 06

DUMTBN-flfi POS-«6 OR-OT OUUIION-D5 Restore RHR given L3 in POS 6 - Refueling

m A. 00

Failure to Restore Failure to Diagnose RHR eiven L3 tn LOSP Event in >0S fi of Refuelin POS 6 of Refueling

A-L3W3-XHE-CW-4

W3-S A-L3W2-XHE-R-4 D-L3W2-XHE Non-Recovery of AC Power in W2

m 00 NL$W2

NON-Recovery of AC Power in 2.62 HRS

NRAC262 Reflux Cooling in window 2

Reft* Cootng Given o 13 11 POS 6 of Rofuefng

SL3!fe-13

Fofkre lo Dioqnoso RCS Loops Isololetf 1099 of RHR Evan! to Cause Failure Vl POS 6 of Reflux Cooing

Q TT SRMKOO SR3V K5U D-L3W2-IH\ / B

Operator Folluro „ INSUF FLOW TO to Feed SGs in I SG FRM AT LEAST Whdow 2-L3 1 AFW PtWP

LSff33 5R3VK53 uSRJV Bit A-L3We-XHE-ST-13

Operator Folluro FALIRE OF FAL TO CLOSE FAIURE CF Operator folure to Bleed tho SECONDARY SOE BOTH PORVS SECONOARY SIDE to estcbSsh SCs I given L2 HEAT REMOVAL r£AT REMOVAL reflux otter PRT ruojure

A P0RV1 BSHW23 A-L3We-XHE-Bl-13 A-L3TTe-XIIE-32-13 Reflux Cooling in window 2

m 00

A-L3We-XHE-SF-17

\-i3ve-xm-BL-n A-i3ire-xiiE-se-i7 Feed and Bleed the RCS in L3, Window 2

Feed ond Bleed the RCS In L2, Window 2

VWit-i

Feed aid Bleed Solely VoJ/e the RCS In L3. Removed In Window POS 6 or Refusing 2

FR3V10

FoiKre lo Dloonose Loss of RHR Event In POS B IT FR3V KO

Operator falur.p ' FALURE OF FEED Operator FoJuro to use LHSI In AND SPU. USMC to use HHSI In Feed ond a>ll feed ond spll In fflvtow? In Window 5

A-L3W2-XHE-CW-5

FSWBL FSW12H A-L3W2-XHB-FL-0 A-L3WZ-XHB-rH-» Feed and Bleed the RCS in L3, Window 2

Feed and Bleed the RCS In L2, nWindow 2 Feed and Blood . Salety VoKrc tho RCS In LJ, Removed In Window POS 6 of Refusing 2

FR3V10 £W-TT2 m 00 Folkre to Diagnose Loss of RHR Event In POS 8

FR3Y KO D-L3YT2-XHB

FR3V 1G3 FR3V IG2

X Operator fcftiV FALURE OF FEED FALURE OF FEED Operator FoJuro to use LHSI III ' ANO SPLL USMO ANO SPLL USNG to use HHSI In Feed and Sill LPI HPI feed and spll h Window? In Window^

A-L3ffS-XHE-0ir-0 FSWta. FSW12H

A-L3W2-X«B-rL-8 A-L3W3-XHB-rH-9 Feed and Bleed the RCS in L3, PCS 6 of Refueling

7L3W -14

Failure to Diagnose Loss of RHR Event in POS 6

FL3W !BU D-L3W3-XHE m

FL3W !CU

Operator failure FALURE OF FEED FALURE OF FEED OperatoIr Failure to use LHSI in AND SPa USING AND SPLL USNG to use tt-fSI in Feed and Spil LPI HPI feed and spil in Window 2 in Window 2

A-L3W8-XHE-CW-U FSW12L FSW12H

A-L3W3-XHE-FL-H \-L3WS-XHE-FH-H Feed and Bleed the RCS in L3, POS 6 of Refueling

FL3nW 2-18

Failure to Diagnose Los9 of RHR Event in POS 6

m oo D-L3W2-XHE

Operator failure FALURE OF FEED FALURE OF FEED Operator Failure to use LHSI in AND SPLL USING AND SPLL USING to use HHSI in Feed and Spill LPI HPI feed and spil In Window 2 In _Wlndow 2

A-L3W2-XHE-CW-18

FSW12L FSW12H

A-L3W2-XHB-FL-1B A-L3W2-XHE-FH-1B Gravity from RWST in L3, Window 2

Gravity from RWST in L3, POS 6 of Refueling

PI

GL3V 3-6

Safety Valve Removed in Window 2

GR3W1G2 SV-WE

INSUF aow Failure to Diagnose Operator Failure THROUGH LOW HEAD Lo66 of RHR Event to establish NJECTION FLOW in POS 6 gravity feed PATH in window 2

D6-CG

D-L3WB-XHE A-L3W2-XHE-G-B Gravity from RWST in L3, Window 2

Gravity from RWST in L3, POS 6 of Refueling m Q J* GL3W -10

Safety Valve Removed in Window 2

GR3VXS2 3V-W8

_ INSUF FLOW Fakire to Diagnose Operato1r Failure THROUGH LOW HEAD Lo66 of RHR Event to establish NJECTKJN FLOW in POS 6 gravity feed PATH in window 2

D6-CG

D-L3WB-XHE A-L3#2-XHE-G-10 Failure of High Pressure Recirculation in Window 2

Failure of High Pressure Recirculation tn Window 3

ciav2-4

Safety VaK'e Removed in Window 2

L3W2CPZM CL3V 304 SV-W2 CL3W2N4

INSUF FLOW FM INSUF FLOW FRM Failure to Diagnose (failure of Recirculatior Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Sproy in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 2 High P Recirc HDR in Window 2

HI PL3W2-4 D-L3W2-XHE A-L3W2-XHE-C-4 Failure of High Pressure Recirculation in Window 2

Failure of High Pressure Recirculation la fftpdoy 8

CL3Wfe-13

L3W2CPZM CL3TVI2013 CL3W2N13

INSUF FLOW FM INSUF FLOW FRM Failure to Diagnose Ifaikre of Recirculation! Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 2 High P Recirc HDR in Window 2

HI H2 PL3W3-13 D-L3W2-XHE A-L3W2-XHB-C-13 Failure of High Pressure Recirculation in Window 2

Failure of High Pressure Reoiroulation In Wlncjcrw e

CL3Y 3-B

Safely Vat/e Removed in Window 2

L3W2CPZM CL3W2N8 CL3V 208 SV-W2

INSUF FLOW FM INSUF FLOW FRM Failure to Diagnose (failure of Recirculatior Operator Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 2 High P Recirc HDR in Window 2

PL3W2-8 D-L3W2-XHE A-L3W2-XHE-C-B Failure of High Pressure Recirculation in Window 2

Failure of High Pressure Reoiroul&tion In Window 8

CL3W2-17

L3W2CPZM CL3W2G17 CL3W2N17

INSUF FLOI W FM INSUF FLOI W FRM Failure to Diagnose (failure of Recirculatior Operato1r Failure LPSI PMPS TO 3 CHRG PMPS IN Loss of RHR Event Spray in Window to Establish CHARG PUMP SUCT THE RECIR MODE in POS 6 High P Rccirc HDR in Window 2

HI H2 PL3W2-17

D-L3W2-XHE A-L3W2-XHE-C-17 Failure of Recirculation Spray in Window 2-cause HPR failure

Pailuro of Recirculation Spray In —Window. % -

FL3H 2—i

loss of HPSH du i to open contoinmer:

L3W2CPZM PR3Y10 C7N CON-VFC-RP-COREM

Foilure to Diagnose Operator Fature Loss of RHR Event to Establish in POS 6 Recirculation Sprov in W2

PR3Vf1G0

D-L3WS-XHE A-L3W2-XHE-P-4

FALURE OF NSDE rALURE OF OUTSDE fcPRAY RECIRCULATION JPRAY RECIRCULATION

F1PSD F2LPSD Failure of Recirculation Spray in Window 2-cause HPR failure

PL3V3-B

, toss of HPSH du i to open contoinmer t

L3W3CPZM PR3Y10 i CON-VFC-RP-COREM -4

Failure to Diagnose Operator Foilure Loss of RrR Event to Establish In PQS 6 Recirculation •Spray In W2

PR3W1G0 D-L3W8-XHE A-L3W3-XHE-P-8

FALLRE OF NSDE "ALURE OF OUTSDE fPRAY RECIRCULATION SPRAY RECIRCULATION

F1PSD F2LPSD Failure of Recirculation Spray in Window 2-cause HPR failure

Failure of Rcolroulation Spray In —Windolnribww . 3

FL3WJ-13

loss of HPSH du i to open contoinmer t

L3W3CPZM PR3VK) oo CON-VFC-RP-COREM

Fdlure to Diagnose Operator Failure Loss of RHR Event to Establish in POS 6 Recirculation Sprov in W2

PR3VCR0

D-13W2-XHE A-L3W3-XHE-P-13

I FALURE Cf NSDE "ALURE OF OUTSIDE BPRAY RECRCULATION SPRAY RECIRCULATION

FtPSD F2LPSD Failure of Recirculation Spray in Window 2-cause HPR failure

Failure of Roolroulntlon Spray In —Windondow 88

PL3W !-17

loss of HPSH du i to open contdnmer t

2 L3W2CPZM PR3YK) 8 CON-VFC-RP-COREM

Failure to Diagnose Operotor Failure Loss of RHR Event to Estabnsh in POS 6 Recirculation Sprcv in W2

PR3\ '1G0

D-L3W2-XHE A-L3W2-XHE-P-17

FALURE OF NSDE FALURE OF OUTSDE SPRAY RECIRCULATION SPRAY RECIRCULATION

FtPSD F2LPSO Correnotion to Recirculation FT8 (C and P) in Windo-f 2 m o o L3W2CPZM

Operator J allure FAILURE OP FEED Failure to Diagnose to Cro3» Connect I A YD SPILL USING H ;,os« of Power Evept BTfST Given successful in Window 3

FSW12H D-L3W2-XHE A-L3W2-XHE-X '\.x,l

as

•owro to —_— ow of RHR gvent I a»2 A-UW2-XrE-C-4 0-Law-XHE o NSUF aw FRH NSUF FLCW FRM LW PRES SI PMP-CLD LCW PRES SI PMP LOS RECK MCE 0 HOT LEOS RECR ZJ ms 1? aswic*

Vent Exfaln Safety Vofvos Figure of Reelrcubtlon Not Rttnova ki Spray In Window Window I 2

VENTLTZ P1.3iraw I— Operotor Faluro Foiki-e to Kognoso Ho Eolabfah Lwa ot RHR Event Ugh P Redrc Vi POS 0 Ini fflnftv 2 7T

0.3Y2A8 A-LJW2-XHE-C-8 D-UW2-XHE m t NSUF FLW FRM NSUF FLOW FRM L/i PRES SI PkP-CLD LOW PRES SI PMP u LOS RECW MOE TO HOT LEOS RECfi o HOPE N3

ms WSHLG CL3V2C8 CL3V2B8

Vent Exists Sofoty Vol/«s Ftikro of Reclreiiotton Mat Removo In Spr

VENTL12 PUW2N8 VW2 PL3W2-B '£••• awrfNB

Operator Fdura :c*xo to Dtoanooe to Eitobbh om of RHR Ewrt M H* P Rocte In POS 8 WWjjpV})!2 M TT OJWO(JO m A-1JSW2-XHE-C-U C-L5W2-XHE o I ' l NSUF aw FRM NSLF aCW FRM U LWI PRES SI PMP r PRES a PW-OD • 0 HOT LEOS RECR LOS RECR, MCE A A ZT ZJ HAS (VkSH.0

Vent Debts Sofely Volvos FiDur_.e of Redrcuhtfen Not R«rev» In Spray In Window Window I 2 Operator Folurs H^> Estabfah H-Vtoto 2 . T~Y

0L.3MAV m A,-L3M->0£-C-17 o WSLF RCW FRM LCW PRES SI PfcP 0 HOT LEOS RECR u

Vent Exbts Safety Vof/03 FcSJrToTRRttclrcubtb n Not Remove In ] Spray In Wndow 2 Window I

vom.12 VW2 Pum-17 PL3W2N4

Failure to Diagnose Operator Failure OPERATOR FAILS Loss of RHR Event to Establish TO ISOLATE THE in POS 6 Recirculation CANAL IN L3 mi Spray in W2 o

PL3W2X4 D-L3W2-XHE A-L3W2-XHE-P-4 A-L3W2-XHE-CW-4

FALURE OF INSIDE FALURE OF OUTSIDE SPRAY RECIRCULATION SPRAY RECIRCULATIO >l

F1PSD F2LPSO PL3V2N8

Foilure to Diagnose Operator Failure OPERATOR FAILS Loss of RHR Event to Establish TO ISOLATE THE in POS 6 Recirculation CANAL IN L3 Spray in W2 o

PL3V2XB D-L3W2-XHE A-L3W2-XHE-P-8 A-L3W2-XHE-CW-4

FALURE OF INSIDE FALURE OF OUTSIDE SPRAY RECIRCULATION SPRAY RECIRCLLATIO

.FIPSD F2LPSD PL3W2N13

Failure to Diagnose Operator Failure OPERATOR FAILS Loss of RHR Event to Establish TO ISOLATE THE in POS 6 Recirculation CANAL IN L3 mi Sproy in W2 o

PL3W2X13 D-L3W2-XHE A-L3W2-XHE-P-13 A-L3W2-XHE-CW-4

FALURE OF INSIDE FALURE OF OUTSIDE SPRAY RECIRCULATION SPRAY RECIRCULATIO 4 &

F1PSO F2LPSO tn • Failure to Diagnose Operator Failure OPERATOR FALS o Loss of RHR Event to Establish TO SOLATE THE 00 in POS 6 Recirculation CANM. IN L3 Spray in W2

PL3V 2X17 D-L3W2-XHE A-L3W2-XHE-P-17 A-L3W2-XHE-CW-4

FAILURE OF INSDE FALURE OF OUTSIDE SPRAY RECIRCULATION SPRAY RECIRCULATION

FLPSD F2LPS0 UNITY IL3W3 RL3W3 VW3 NL3W3 FL3W3 GL3W3 SEQ # END-STATE-NAMES

L3W3R6 — LOSP L3, WINDOW W3, POS R6 n

1 @ 2 @ 3 @ 4r CD 5 CD 6 @ m in 7 CD o 8 CD NO 9 © 10 CD 11 @ m 12 CD

$ a S < 55 • i E- < E- 02 l 1 Iz; Q Q la ^Q <§><§><§;(§} o@)@;0 O tt: CO ^H C\2 CO -L, ID CO {> CD O" Ed CQ QO_

rO ^ ^ CO

CO ^ EC o Q CO ^ £ CO ^ k-3

CO CO CO -J o_l 1 CO 1 £ CO CD K

^ CO ro £ __l fl 1—<

!~ E- 1—( z Z)

E-510 UNITY IL3W3 RL3W3 VW3 NL3W3 FL3W3 GL3W3 SEQ # END-STATE-NAMES

L3W3R10 — LOSP L3, WINDOW W3, POS R10

1 @ 2 @ 3 @ 4 CD 5 CD 6 @ m 7 CD 6. 8 CD 9 @ 10 CD 11 (* 12 CD top event for L3 LOSP - L3 in window 3

II »«qutn«y Celautatlon ror L3W3

Frequency of LOSP

\ / !L3ff OS ?BSQ-L3

. Dtraton ol Frequency of PCS tt of o Probobclty ProboMity 8 V of RtfudkM Refueing Relating Outage of POS t) Owen thol IE occurs r Ouloga Reluelin] Outage In wl gVen RIO

PBOB-wamo u

fxroOon of Freojency of PC 31 6 'Of & ftafueing ProcobUty C -dried Mshtononco . Ojrolloo of ProbobUty P"S 8 ol 0 Drolned F DS 6 of ReliKJing Refueling Outage thai IE occurs 'OS 6 ol Orolned thol E oociri I ointtnonca Outoga Outoq« h v1 tfwn R6 olntenonce Ouloge In wl oVcn 06

DUfUTON-fl6 Rffia OR-WT Restore RHR given L3 in POS 6 - Refueling

m

Failure to Restore Failure to Diagnose RHR given L3 In LOSP Event in Loss of RHR >0S 8 of Refuelin j POS 6 of Refueling POSs 3-13

A-L3W3-XHE-CW-4

W3-S A-L3W3-XHE-R-4 D-L3W3-XHE Non •Recovery of AC Power

Ni/rw3

Non-Recovery of AC Power in 3.48 HRS

NRAC346 Reflux Cooling in window 3

R«fX« Coofng Given o RHRj 11 POS 6 of R«fuelng

313*3-3

Fotluro lo Wognoso RCS Loop1s Isoloted L099 Of RHR Event to Cou9« Foilura In POS 6 ol Reflux Cooing m I SR3VK313 SR3VMG0u0 IB0-W3 D-L3W3-XHB

Opefator Fa'lure .. INSUF FLOW TO to Feed S09 h 1 SG FRM AT LEAST Window 3-L2 1 AFW PUMP

"9" SR3VK11 A-t3TT3-XHE-ar-S SR3VK53 £ Operator Foi'kro FALLRE OF FAL TO aOSE FAILURE CF Operator folura to Bleed ths SECONOARY SDE BOTH PORVS SECONDARY 3DE to eatcbtsn SGs I given L2 HEAT REMOVE. t€AT REMOWL reflux otter PRUlUgturg

BS1IW23 PORV1 A-L3W3-XHE-ai-S A-L3*3-XHB-S2-3 Reflux Cooling in window 3

Reflux Cooing Given o RHR3 11 POS 6 of Rofuetng

Fdlura to Dfaqnoso RCS Loops Isolated Lo$9 of RHR Event to COUM FaJuro I Vi POS 6 I of Reffcjx Cooing

SR3VKSV3 SR3W1G00

D-L3W3-XHB

Operator Failure , INSUF FLOW TO to Feed SG9 In 1 SG FRM AT LEAST WMow 3-L2 1 AFW PUMP

"9" SRM X311 A-L3W3-XHE-3P-S SR3V 'K33

Operator Failure FALLRE OF FAL TO aOSE FAILURE OF to Bleed tho SECONOARY SOE BOTH POBVS SECONOARY SIDE SOs t given L2 HEAT REMOVAL r£AT REMOVAL z PORV1

A-L3ff3-XHE-Sl-8 A-L3Yf3-XHB-S2-a Feed and Bleed the RCS in L3, Window 3

Feed and Bleed the RCS In L2, Whdow 3 TJ FL3V3-4

Feed and Bkitx) Sal»ty VoVe the RCS In L3 Removed In Window 3

FR3 f» SY-1T3 tn Failure to Dkionose Loss of RHR Event

FR3V1GO D-L3W3-XBB

FR3V 103 FR3V 1G2

Operator fofkjrj.' FALURE OF FEED FALURE OF FEED Operator FoJur* (o use LHSI In ANO SPLL USNC ANO SPU. USNG to use hHSI In Feed and Sill LPI HPI feed and spll In Wtv)ow3 In Window 5 T A-LStfa-XHB-Cn--*

FEW 12. FSW12H A-13W3-XKE-rL-4 A-L3W3-XHB-rK-.< Feed and Bleed the RCS in L3, Window 3

Feed ond Bleed th« RCS In 12, Window 3

FLOr'3-7

Feed and Heed Salety VaK/e U» RCS In L3 Removed In Window 3

FR3Y10 SV-TT3

Fafkro to Diaorowe Loss of RHR Event

uFR3V1GO D-L3W3-XHE

"9" FR3\ IG2 FR3V 103

Operator fatore' FALURE OF FEED FALURE OF FEED . Operator Falire to use LHSI In ' ANO SPIL USNG AND SPLL USNG to use l-HSI In Feed and Sill LPI HPI feed ond epll in Wlndow3 In Window 3

A-L3ir3-XlrjE-Clr-7

FSW12L FSW12H A-L3W3-XHE-rL-7 A-L31T3-XHB-rH-7 and Bleed the RCS in L3, Window 3

Food and Blowi the RCS In U "5" FL311 3-10.

Foilure lo Wogrxwo Loss of RHR Event

nav< 3Bio D-L3W3-XHB n "5" PL31T3D10

Operator failure , FALURE OF FEED FALURE OF FEED Operator Faiuro to use LRSI 'In • AND SPtl USNO AND SPll USNG to use WSI In Feed and &II LPI HPI feed and spll In Wirvkw>3 In Window 5

A-L3VT3-ZHB-Clt-10

r£>W34l TS1T34H A-L3W3-XHZ-FL-10 A-L3W3-ZHB-rH-10 ed and Bleed the RCS in L3, Window 3

Feed and Bleed Iho RCS In L3 ZJ u D-L3W3-XHB

n ZJ

Operotor tolMf* TALURE OF FEED FALURE OF FEEO Operator FoJure to uso LH3I In • AND SPU USING AND SPLL USNG to use Hfil In Feed and asll LPI HPI feed and sell In WindowJ In Window^

A-L3W3-2T.HE-CIT-12

rSW3U F81T34H

A-L3W3-XHB-FL-13 A-L3W3-XHB-rH-lS Gravity from RWST in L3, Window 3

Gravity from RWST in L3, w A. to GLOaT 3-6

Safety Valve Removad in Window 3

GR3Vf1G2 SV-W3

,_ INSUF FLOW Faikjre to Diagnose Operator Failire ^THROUGH LOW HEAD Lose of RHR Evenl to e3tablieh NJECTK3N FLOW gravity feed PATH in window 3

D6-CG

D-L3W3-XHE A-L3W3-XHE-G-6 Gravity from RWST in L3, Window 3

Gravity from RWST in L3. r 1 GL3V 3-8 1 Safety Vote Removed in Window 3 L A GR3y> f1G 2 SV-W3

1 1 INSUF FLOW Failure to Diognose Operator Failure THROUGH LOW HEAD Loss of RHR Event to establish EJECTION FLOW gravity feed PATH in window 3 A C\ D6-CG r\ D-L3VT3-XHE A-L3W3-XHB-G-B UNITY IL3W4 RL3W4 VW4 NL3W4 FL3W4 GL3W4 SEQ # END-STATE-NAMES

5H- L3W4R6 — LOSP L3, WINDOW W4, POS H6

-?>;

1 2 3 @ 4 OK 5 CD 6 ® i 7 OK 8 CD 9 <2> 10 CD 11 12 CD

mt •••• \SJ— w 3 <

1 E- <§><§; <§; (§; u(§; (§> o LJ =*fc 00 ,H ca co ^ in co ?>

CO CL

^-" ^ ^

T* CD o^ Q Z

•* ^ £ CO ,*, CO rO _J D_ 00 CD o ^ _J & 1

•* 1

00 •J CD K Q ^1- ^ -* rO £ _1 CD J 1—1

>- E- t—1 Z ^

E-524 UNITY IL3W4 RL3W4 VTV4 NL3W4 FL3W4 GL3W4 SEQ # END-STATE-NAMES

L3W4R10 — LOSP L3, WINDOW W4, POS .^10

1 2 ® 3 @ 4 OK 5 CD 6 @ 7 OK 8 CD 9 ® to CD 11 @ m 12 CD top event for L3 LOSP - L3 in window 4

II rrvqumtnr CAiouUtlon rw

Frequency of LOSP rr 9 FRB4-L\ 3/ 1MH OS

T Duration ol Frequency of POS » of 0 PreboHty Prcbobaity V of R«fwHng Rofgtfcg Rofuting Outogo of POS t> Owon that l£ occurs Outage R«tuebr>3 Outooc In wl gfv«n RIO

a DURATION-RIO RSTUQ. FRAC-POS*) U

(Xrallon ol Fnstjjeney of 6' of .'o ftetueBng ProbobTflly t "clned Motntonence l&rolfon of PloboNfty Pi 5 6 of 0 DfOhsd F OS 8 of Refusing Refirtwtg Ojtoge that C occurs >0S 6 of Orokwd thol E otari f olntuwnce Outoge Outage h w1 $ton R8 fcoWenonce Outoga Vi wl o^en 06

PR08-VMD8 POS-0« Restore RHR given L3 in POS 6 - Refueling

I m

RL3W4 6. 10

Failure to Restore atlure to Diagnose RHR given L3 In LOSP Event in Loss of RHR 'OS 8 of Refuelinh FlOS 6 of Refueling PDSs 3-13

A-L3W4-XHE-CW-3

W3-S A-L3W4-XHE-R-5 D-L3W4—XHE Non—Recovery of AC Power

i to 00 NLISW4

Non-Recovery of AC Power in 4.55 HRS

NRAC455 Reflux Cooling in window 4

Reflux Cooing Gwen o RHR3 Ii POS 6 of Refusing

1 Folluro lo Mognose RCS Loops Isololed L099 of RHR Evorrt lo Came Fo'ilura o( Reflux Cooling W 4i POS 6 in to VO SR3V1G13 SR3K1GO0 D-L3TH-XHE

Operolor Foiluro ._ INSUF FLOW TO to Feed SGs In I SG FRM AT LEAST Window +-L3 1 AFW PUP

LSW4 SR3V1G3 SRJV 1C11 A-UIM-MB-SP-S

Operator Failure FALLRE OF FAL TO CLOSE FAILURE Or Operolor failure to Bleed the SECONOARY SOE BOTH PORVS SECONOARY SIDE to eotcbtoh SCs I given L3 HEAT REMOVAL HEAT REMCV/L reflux ofter PRT moliire

SSHW4 P0RV1 3SDW4 x-Law*-xHE-si-a A-L3*f4-XHE-B£-5 Reflux Cooling in window 4

RoflK Cooing Given o RHRJ POS 6 of Refusing

S13+-4-8

FoOure to Koqnose RCS Loops Isololed L093 of RHR Event 1o Came Falire h POS 6 of Reflux Cooing

SR3VK313 SR3WB00 I30-W4- D-L3YU-XHI!

Operator Fofluro INSUF FLOW TO to Feed SGs h I SG FRM AT LEAST Window +-L3 1 AFW PUP

"9 SR3V K11 A-L3W4-XHB-Sr-a SR3V1G3

Operator Foflure FALLRE OF FAJL TO aOSE FAILURE CF Operator failure to Bleed the SECONOARY SOE BOTH PORVS SECONOARY SIDE to eatabfsh SOs 1 oven L3 HEAT REMOVE. HEAT REMOVAL reflux after PRT rupture 1^ SBHW4 FORV1 A-L3W*-XnE-Sl-8 A-UVU-XHE-ae-B and Bleed the RCS in L3, Window 4

Feed aid Bleed the RCS In L2, Window 4 IT PL3) 4-8

F«ed and Bteed Solely Vokre the RCS In L3 Retnovod In Window Q FR3 W

Falkro to Noavjse Lota of RHR Event

uFR3V «0 D-WWt-XHE

FR3V 1G3 FR3VIG2

Operotor IdM-e > FALURE OF FEED FALURE OF FEED Operator Fdluro to use LHSI In ' ANO SWLL USNC ANO SPLL USNG to use HHSI In Fead and Spll LPI HPI feed ond spfl h Wndow4 In Window rA

A-L3ir*-xnB-c*r-6 FSW12L FSW12H A-L31W-XBB-fL-0 A-L3*U-XHE-rn-0 ed and Bleed the RCS in L3, Window 4

Feed and Bleed tho RCS In L2, Window 4 TT PL31 4-8

Food and Blood Salety VaVe tho RCS In L3 Removed In Window 4

FR3 Y10

Folkiro to Dfognoso Loss of RHR Event

uFR3V KO D-L3W4-XHB

FR3V 103 FR3\ tG2

Operato£r /oW-o • FALURE OF FEED FALURE Of FEED Operator Foiuro to use LHSI In' AND SPLL USNG WO SPLL USNG to use HHSI In Feed and Sbll LPI HPI feed and spll h Wrylow4 In Window 5

A-L31U-XHB-CW-8

FSWKL FSW12H A-L3W4-XHB-FL-B A-L3»f4-XHE-rH-e Feed and Bleed the RCS in L3, Window 4

Operator /fdli*-»' TALURE OT FEED to usa LHSI lh' AND SPU USNG Feed and Sell LPI In WW)ow4

A-LSH-t-XDE-CVf-lO

A-L3W4-XHB-FL-10 A-L3W+-XHI-rH-10 Feed and Bleed the RCS in L3, Window 4

Feed ond Bleed tho RCS In L3 Z3

I Failure to Diagnose Losa of RHR Event

D-L3W4-XHE u

FALURE OF FEED Operator Failure MO SPLL USNG to use HHSI In HPI feed ond spll In Window 4

A-L3W4-XI£E-CW-ia

A-L3W4-XHB-FL-13 A-L31f*-XHZ-rH-lE Gravity from RWST in L3, Window 4

Gravity from RWST in L3, tn ^ • r GL3VI 4-5 | Safety Valve Removed in Window 4

L^ A GR3Vf1G2 3V-W4

1 1 INSUF HOW Failure to Diagnose Operator Failure THROUGH LOW HEAD Loss of RHR Event to establish EJECTION FLOW gravity feed PATH A iAn window 4 AD6-CG

D-L3W4-XHE A-L3W4-XHB-G-0 Gravity from RWST in L3, Window 4

Gravity from RWST in L3,

6, G13* 4-B

Safety Valve Removed in Window 4

GR3VfK32 SV-W-4

,_ INSUF FLOW Fdlure to Diagnose Operator Failure rHROUGH LOW HEAD Lo6e of RHR Event to estobiish NJECTION FLOW aravity feed PATH in window 4

D6-CG

D-L3W4-XHE A-L3*T4-XHE-G-8 Kiyoharu Abe Ephraim Asculai Dept. of Reactor Safety Research Division of Nuclear Safety Nuclear Safety Research Center Wagramestrasse, 5 Tokai Research Establishment P.O. Box 100 JAERI A-1400 Wien Tokai-mura, Naga-gun AUSTRIA Ibaraki-ken, JAPAN Vladimar Asmolov Head, Nuclear Safety Department Sarbes Acharya I. V. Kurchatov Institute Department of Energy of Atomic Enegry NS-1/F0RS Moscow, 123181 Washington, DC 20585 RUSSIA

Dr. Dlvi Adalioglu J. de Assuncao Cekmece Nukleer Arastraima ve Cabinete de Proteccao e Egitim Merekezi Seguranca Nuclear P.K. 1 Ministerio da Indusstria Havaalani/ISTANBDL Ave. de Republica 45-6 TURKEY 1000 Lisbon PORTUGAL

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Dist-1

:<^mr.~^-7^::mm; m;';?--. Eric Beckjord Dennis Bley USNRC-RES/DO Buttonwood Consulting MS: T-10F12 17291 Buttonwood St. Fountain Valley, CA 92708

Robert Bernero USNRC-NMSS/DO Roger Blond MS: T-8A23 Booz-Allen & Hamilton 4330 East West Highway Bethesda, MD 20814 Andrea Besi Institute for Systems Engineering and Informatics M. P. Bohn CEC Joint Research Centre Division 6449 CP N 1 Sandia National Laboratories 1-21020 Ispra (Varese) Albuquerque, NM 87185 ITALY

Dr. Mario Bonaca John Bickel Manager, Reactor Engineering Idaho National Engineering Lab. Northeast Utilities EG&G MS: 3850 P.O. Box 270 P.O. Box 1625 Hartford, Conn. 06141 Idaho Falls, ID 83415 Robert B. Borsum Vicki Bier Nuclear Power Division Dept. of Industrial Engineering B & W Nuclear Tech University of Wisconsin-Madison 1700 Rockville Pike 1513 University Avenue, Room 389 Suite 525 Wisconsin, WI 5370S Rockville, MD 20852

Scott Bigelow Stephen Boult S-CUBED Electrowatt Engineering Services 2501 Yale SE, Suite 300 (UK) Ltd. Albuquerque, NM 87106 Grandford House 16 Carfax, Horsham West. Sussex RH12 IUP Prof. Dr. Dr.-Ing. E. H. Adolf ENGLAND Birkhofer Gesellschaft fur Anlagen und Reaktorsicherheit (GRS) mbH Gary Boyd Forschungsgelande Safety & Reliability Optimization D-8046 Garching Services Federal Republic of Germany 9724 Kingston Pike, Suite 102 Knoxville, TN 37922

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ENEA/DISP (2) Mr. Gubler Attn: Alvaro Valeri International Atomic Energy Agency Alfredo Bottino NENS/SAD B0842 Via Vitaliano Brancati, 48 Wagramerstrasse 5, P.O. Box 100 00144 Roma EUR A-1140 Vienna ITALY AUSTRIA

Walter P. Engel Paul M. Haas, President PRAG MGR Analysis & Reg Matter Concord Associates, Inc. NE-60 725 Pellissippi Parkway CRYCITY Suite 101, Box 6 US DOE Knoxville, TN 37933 Washington, DC 20585

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William Hopkins Dr. P. M. Herttrich Bechtel Power Corporation Gesellschaft fur Anlagen und 15740 Shady Grove Road Reaktorsicherheit (GRS) mbH Gaithersburg, MD 20877 Schwertnergasse 1 5000 K61n 1 GERMANY Dean Houston USNRC-ACRS MS: P-315 Dr. D.J. Higson Radiological Safety Bureau Australian Nuclear Science & Der-Yu Hsia Technology Organisation Institute of Nuclear Energy Research P.O. Box 153 Lung-Tan 325 Roseberry, NSW 2018 TAIWAN AUSTRALIA

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Zen Mendoza Daniel Manesse SAIC ISPN 5150 El Camino Real Boite Postale n° 6 Suite C3 1 92265 Fontenay-aux-Roses CEDEX Los Altos, CA 94022 FRANCE Dr. J. Mertens Fred Mann Division of Risk Analysis & Westinghouse Hanford Co. Reactor Technology WIA-53 Institute of Safety Research P.O. Box 1970 Research Centre Julich (KFA) Richland, WA 99352 D-52425 Julich GERMANY

Nadia Soido Falcao Martins Comissao Nacional de Energia Nuclear Jim Meyer R General Severianao 90 S/408-1 Scientech Rio de Janeiro 11821 Parklawn Dr. BRAZIL Suite 100 Rockville, MD 20852 Harry F. Martz Analysis and Assessment Division Joe Minarick Los Alamos National Laboratory Science Applications Int'l Corp. Los Alamos, NM 87545 301 Laboratory Road P.O. Box 2501 Oak Ridge, TN 37830 Herbert Massin Commonwealth Edison Co. 35 1st National West Chicago, IL 60690

Dist-9

;mm PvtfK5" ' •:• • \mm «•*• i* &%mm?M£m&. • Jose I. Calvo Molins, Head Ken O'Brien Division of P.S.A. and Human Factors University of Wisconsin Consejo de Seguridad Nuclear Nuclear Engineering Dept. Calle Justo Dorado, 11 153 Engineering Research Blvd. 28040 Madrid Madison, WI 53706 SPAIN

Theresa Oh Ken Muramatsu INEL Tech Library Risk Analysis Laboratory EG&G MS: 2300 Japan Atomic Energy Research P. O. Box 1625 Institute Idaho Falls, ID 83415-2300 Tokai-mura, Naka-gun Ibaraki-ken, 319-11, Tokyo JAPAN N. R. Ortiz, Director Nuclear Energy Technology Division 6400 Joseph A. Murphy Sandia National Laboratories Division of Safety Issue Resolution Albuquerque, NM 87185 U.S. Nuclear Regulatory Commission MS: T-10E50 Washington, DC 20555 Robert Ostmeyer U.S. Department of Energy Rocky Flats Area Office Kenneth G. Murphy, Jr. P. 0. Box 928 US Department of Energy Golden, CO 80402 19901 Germantown Rd. Germantown, MD 20545 Robert Palla USNRC-NRR/SPSB Shankaran Nair MS: O-10E4 Central Electricity Generating Board Berkeley Nuclear Laboratories Gareth Parry Berkeley NUS Corporation Gloucestrshire CL13 9PB 910 Clopper Rd. UNITED KINGDOM Gaithersburg, MD 20878

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Dist-13

•'W-$m& ;•-*&: •<^^^m^

Donnie Whitehead Department 6412, MS: 0747 Sandia National Laboratories P.O. Box 5800 Albuquerque, NM 87185-0747

Keith Woodard PLG, Inc. 7315 Wisconsin Ave. Suite 620 East Bethesda, MD 20814-3209

John Wreathall John Wreathall & Co. 4157 MacDuff Way Dubin, OH 43017

M. K. Yeung University of Hong Kong Mechanical Engineering Dept. Polfulam HONG KONG

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Carlo Zaffiro A.N.P.A. Directorate for Nuclear Via Vitaliano Brancate, 48 1-00144 Rome ITALY

Dr. X. Zikidis Greek Atomic Energy Comm. N.R.C.P.S. "Demokritos" GR-153 10 Agia Paraskevi Attiki GREECE NRC FORM 335 U.S. NUCLEAR REGULATORY COMMISSION 1. REPORT NUMBER (2-89) (Assigned by NRC. Add Vol., Supp., Rev., and Addendum Numbers, if any.) SMT^M?' BIBLIOGRAPHIC DATA SHEET (See instructions on the reverse) NUREG/CR-6144 2. TITLE AND SUBTITLE BNL-NUREG-52399 Evaluation of Potential Severe Accidents During Low Vol.2, Part 3A Power and Shutdown Operations at Surry, Unit 1: 3. DATE REPORT PUBLISHED Analysis of Core Damage Frequency from Internal MONTH | YEAR Events During Mid-loop Operations-Appendices E June 1994 (Sections E.1-E.8) 4. FIN OR GRANT NUMBER L1922 5. AUTHOR(S) 6. TYPE OF REPORT T.L. Chu, Z. Musicki, P. Kohut, D. Bley1, J.Yang, B. Holmes , G. Bozoki, C.J, Hsu, D.J. Diamond, D. Johnson , J. Lin1, R.F. Su3, V. Dang3, D. Ilberg4, S.M. Wong, N. Siu3 7. PERIOD COVERED (Inclusive Dates)

8. PERFORMING ORGANIZATION — NAME AND ADDRESS (If NRC. provide Division. Office or Region, U.S. Nuclear Regulatory Commission, and mailing address; if contractor, provide name and mailing address.) Brookhaven National Laboratory 1PLG inc., 4590 McArthur Blvd. Newport Ben. CA 92660-2027 Upton, NY 11973 AEA Technology, Winfrith, Dorchester, Dorset, England, DT2 8DH 3MIT, Cambridge, MA 02139 (N. Siu currently at EG&G, Idaho Falls, ID 84315) Soreq Nuclear Research Center, Yavne 70600, Israel 9. SPONSORING ORGANIZATION — NAME AND ADDRESS llfNRC. type "Same as above"; if contractor, provide NRC Division, Office or Region, US. Nuclear Regulatory Commission, and mailing address.) Division of Safety Issue Resolution Office of Nuclear Regulatory Research U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 10. SUPPLEMENTARY NOTES

11. ABSTRACT 1200 words or less) During 1989, the Nuclear Regulatory Commission (NRC) initiated an extensive program to carefully examine the potential risks during low power and shutdown operations. The program includes two parallel projects being performed by Brookhaven National Laboratory (BNL) and Sandia National Laboratories (SNL). Two plants, Surry (pressurized water reactor) and Grand Gulf (boiling water reactor), were selected as the plants to be studied. The objectives of the program are to assess the risks of severe accidents initiated during plant operational states other than full power operation and to compare the estimated core damage frequencies, important accident sequences and other qualitative and quantitative results with those accidents initiated during full power operation as assessed in NUREG-1150. The objective of this report is to document the approach utilized in the Surry plant and discuss the results obtained. A parallel report for the Grand Gulf plant is prepared by SNL. This study shows that the core-damage frequency during mid-loop operation at the Surry plant is comparable to that of power operation. We recognize that there is very large uncertainty in the human error probabilities in this study. This study identified that only a few procedures are available for mitigating accidents that may occur during shutdown. Procedures written specifically for shutdown accidents would be useful. 12. KEY WORDS/DESCRIPTORS (List words or phrases that will assist researchers in locating the report.) 13. AVAI LABI LITY STATEMENT Surry-1 Reactor-Reactor Shutdown; Surry-1 Reactor-Risk Assessment; Unlimited Surry-2 Reactor-Reactor Shutdown; Surry-2 Reactor-Risk Assessment; 14. SECURITY CLASSIFICATION Failure Mode Analysis, Reactor Accidents, Reactor Core Disruption, /This Page) Reactor Start-up, RHR Systems, Systems Analysis, Thermodynamics, Unclassified Sandia National Laboratories (This Report) Unclassified 15. NUMBER OF PAGES

16. PRICE

NRC FORM 33S (2-89)