ENCLOSURE 2 SEQUOYAH NUCLEAR PLANT, UNIT 2 FUKUSHIMA NEAR-TERM TASK FORCE RECOMMENDATION 2.3: SEISMIC RESPONSE REPORT SEQUOYAH NUCLEAR PLANT - UNIT 1 FUKUSHIMA NEAR-TERM TASK FORCE RECOMMENDATION 2.3: SEISMIC RESPONSE REPORT 12-November-2012 WorleyParsons 633 Chestnut St. Suite 400 Chattanooga TN, 37450 Tel: 423-757-8020 Fax: 423-757-5869 www.worleyparsons.com WorleyParsons Services Pty Ltd ABN 61 001 279 812 © Copyright 2012 WorleyParsons Services Pty Ltd NTTF Recommendation 2.3: Seismic Response Report Sequoyah Unit 1 REV DESCRIPTION ORIG REVIEW WORLEY- DATE CLIENT DATE PARSONS APPROVAL APPROVAL O SQN Unit 1 Seismic 12-Nov-12 ii12 12. Walkdown Report TSimmersSP.ork E/J.Edgar Page 2 of 438 Ei I NTTF Recommendation 2.3: Seismic Response Report Sequoyah Unit 1 Table of Contents 1. Executive Sum m ary ............................................................................................................ 4 2. Seism ic Licensing Basis ..................................................................................................... 5 2.1. General Plant Description ............................................................................................ 5 2.2. G round Response Spectra ............................................................................................. 5 2.3. Structures ............................................................................................................................ 7 2.4. Equipm ent .......................................................................................................................... 7 3. Personnel Q ualifications ...................................................................................................... 9 3.1. Equipm ent Selection Personnel ..................................................................................... 9 3.2. Seism ic W alkdown Engineers ....................................................................................... 9 3.3. Licensing Basis Reviewers ............................................................................................. 9 3.4. IPEEE Reviewers ............................................... 10 3.5. Peer Review Team ...................................................................................................... 10 4. Selection of Structures, System s and Com ponents ............................................................ 11 4.1. SW EL Selection .......................................................................................................... 11 4.2. SW EL Analysis ............................................................................................................... 12 5. Seism ic W alkdowns and Area W alk-Bys ............................................................................ 13 5.1. Seism ic W alkdow n Procedure ...................................................................................... 13 5.2. SW C & AW C Sum m ary ............................................................................................... 14 6. Licensing Basis Evaluations .............................................................................................. 16 6.1. Licensing Basis Calculations ........................................................................................ 16 6.2. Potentially Adverse Seism ic Conditions ....................................................................... 16 7. IPEEE Vulnerabilities Resolution Report ............................................................................ 19 7.1. IPEEE Description ....................................................................................................... 19 7.2. IPEEE Findings and Vulnerabilities ............................................................................ 19 7.3. NRC IPEEE Review ................................................................................................... 20 7.4. Response to IPEEE Review ........................................................................................ 20 8. Peer Review ............................................................................................................................ 22 9. References ............................................................................................................................... 23 10. Appendices ........................................................................................................................... 24 Appendix A: Resum es ........................................................................................................ 25 Appendix B: Base List 1 ..................................................................................................... 61 Appendix C: Base List 2 ...................................................................................................... 84 Appendix D: SW ELs and Area List ...................................................................................... 90 Appendix E: SW Cs .................................................................................................................. 96 Appendix F: AW Cs ............................................................................................................... 337 Appendix G : Peer Review Report ......................................................................................... 430 Page 3 of 438 Ei• NTTF Recommendation 2.3: Seismic Response Report Sequoyah Unit 1 1. Executive Summary As a result of the Fukushima Daiichi Nuclear Power Plant accident, the U.S. Nuclear Regulatory Commission required all US nuclear power plants to perform seismic walkdowns to identify and address degraded, non-conforming or unanalyzed conditions and to verify the current plant configuration with the current seismic licensing basis. The NRC Near-Term Task Force (NTTF) issued a report (Reference 1) that made a series of recommendations. Subsequently, the NRC issued a 50.54(f) Letter (Reference 2) that requests information to assure that these recommendations are addressed by all U.S. nuclear power plants. This report provides guidance for conducting a seismic walkdown as required in the 50.54(f) Letter, Enclosure 3, Recommendation 2.3: Seismic. In support of conducting the NTTF-2.3 Seismic Walkdowns, the Electrical Power Research Institute (EPRI) issued a report entitled Seismic Walkdown Guidance (Reference 3) to provide instruction for uniform seismic walkdowns of all U.S. nuclear power plants. This document also includes guidance for reporting the findings of the required walkdowns. At Unit 1 of the Sequoyah Nuclear Power Plant, a total of 120 general Seismic Category I equipment items were selected from the original IPEEE Safe Shutdown Equipment List (SSEL) to fulfill the requirements of the NTTF-2.3 Seismic Walkdowns. The selected items were located in various environments and included many different types of equipment from multiple safety systems. A total of 46 areas were included for area walk-bys. The equipment walkdowns and area walk-bys were performed by two teams, each consisting of two seismic engineers and operations personnel, between July 13, 2012 and August 10, 2012. Of the 120 equipment items in the Seismic Walkdown Equipment List (SWEL), 110 were completed during the walkdown phase. Twelve potentially adverse seismic conditions were found and addressed through the TVA Corrective Action Program. There are ten remaining items of equipment that were inaccessible at 100% power due to physical limitations or excessive safety hazards. These equipment walkdowns will be performed during the next Sequoyah Unit 1 refueling outage, scheduled for October through November 2013. Page 4 of 438 i•1 NTTF Recommendation 2.3: Seismic Response Report Sequoyah Unit 1 2. Seismic Licensing Basis The seismic licensing basis for the Sequoyah Nuclear Power Plant is derived from Reference 4 - Sequoyah Nuclear Plant Living Final Safety Analysis Report Amendment 24. 2.1. General Plant Description The Sequoyah Nuclear Power Plant site is located near the geographical center of Hamilton County, Tennessee, on a peninsula on the western shore of Chickamauga Lake at Tennessee River mile (TRM) 484.5. The Sequoyah site is approximately 7.5 miles northeast of the nearest city limit of Chattanooga, Tennessee, 14 miles west- northwest of Cleveland, Tennessee, and approximately 31 miles south-southwest of TVA's Watts Bar Nuclear Power Plant. The plant has been designed, built, and is operated by TVA and contains two identical units. Each of the two units employs a Pressurized Water Reactor Nuclear Steam Supply System with four coolant loops, furnished by Westinghouse Electric Corporation. Unit 1 began commercial operation in July 1, 1981. 2.2. Ground Response Spectra The seismic design basis for Sequoyah Nuclear Power Plant is the 0.18g horizontal peak ground acceleration represented by the modified Housner-shape spectrum for Safe Shutdown Earthquake (SSE). Operating Basis Earthquake (OBE) is one-half of SSE ground acceleration. Vertical ground acceleration is two-thirds of the horizontal ground acceleration. Figure 1 illustrates the relationship between the 5% damped minimum design response spectra and the actual site seismic design response spectra for the SSE used in the design of rock-supported structures. Page 5 of 438 NTTF Recommendation 2.3: Seismic Response Report Sequoyah Unit 1 -I ~ ýc VIA 58 ý\!ýx X\ -A 48 4 20 ACTUAL DES GN SPECT-FiýA N NIZ I0 N'. Uj 4 INIMUM DESI ;zS 4 ECTRA' U) Xý4 I - der 0 91 -j I NK z VIX 1. Se-1,77K, I A-41\ X XI VN .4 IX,