DISCLAIMER This contractor document was prepared for the U.S. Departnent of Energy (DOE), but has nor underzone programmatic, policy; or publication review, and is provided for informaon only. The document provides preliminary information that may change based on new information or analysis, and represents a conservative treatment of parameters and assumptions to be used specifically for Total System Performance Assessment analyses. The document is a prelimina,,v lower level contractor document and is not intended for publication or wide distribution. Although this document has under-one tecimical reviews at the contractor organization, it has not undergone a DOE policy review. Therecfore. the .'iews and opinions of authors expressed may not state or reflect those of the DOE. However, in the interest of the rapid transfer of information, we are providing this document for your information per your request. DI5~ 1. QA: OFFIOE OF 0PMLIAN RALIOAC1JVE WASTE MANAGEMENT 1. QA: ANALY818 AWL COVER $MEEfT o(>je a. u Modo Cho*an w PkI C3 Oawmow Modal bxtM O Type of Aidk%at. 0 d~~ w~4t L3 MO%$ uW mm ~M04n4E mw U~tmxmd U.. oAV to oft lfwtd " qm1Icai~ooaaw" kp to 0** MTaV*c ot iSn db MO& ewea; 4, Tfl.: gnl,WfYwlq . it AUVIBOS of ih OLu 8hI uid Wait. PacI Outer Lan1N ANL-ES4A-00m, t 1W 00 m~~~~ ofteDlt,% &jfo odm aatPce u a ;3 ,AO 9.ta wo- Rca--fltY 9.ORA~O COPY~. LAS VEGAS DOCUMENT CONTROL AP-&.lO.i ft. 020m Enclosure 9 OFFICE OF CIVILIAN RADIOACTIVE WASTE MANAGEMENT ANALYSIS/MODEL REVISION RECORD Complete Only Applicable Items 1. Page: 2 of: 80 2. Analysis or Model Title: Environment on the Surfaces of the Dnp Shield and Waste Package Outer Barrier 3. Document Identifier (including Rev. No. and Change No., if applicable): ANL-EBS-MD-000001 REV 00 4. Revision/Change No. 5. Description of Revision/Change 00 Initial issue I AP-3.10OQ.4 Rev. 06/30/1999 CONTENTS Page ABBREVIATIONS AND ACRONYMS .................................................................................. 9 1 PPU R PO SE .............................................................................................................................. 11 1.1 PU RPO SE AN D SCOPE ......................................................................................... 11 1.2 ANALYSIS/MODEL DESCRIPTION AND LIMITATIONS .............................. 12 1.3 RELATION TO ASSESSING SYSTEM PERFORMANCE ................................. 14 1.4 RELATIONSHIP TO PRINCIPAL FACTORS .................................................... 14 1.5 RESOLUTION OF COMMENTS IN THE NRC'S ISSUE RESOLUTION STA TU S R EPO RTS ................................................................................................ 14 1.5.1 Subissue 2 in Issue Resolution Status Report Key Technical Issue: Evolution of the Near-Field Environment ................................................ 14 1.5.2 Subissue 1 in Issue Resolution Status Report Key Technical Issue: Container Life and Source Term .............................................................. 20 2. QUALITY A SSURAN CE ............................................................................................... 21 3. COMPUTER SOFTWARE AND MODEL USAGE ....................................................... 22 3.1 SOFTWARE APPROVED FOR QA WORK ....................................................... 22 3.2 SOFTW ARE ROUTIN ES ....................................................................................... 22 4 . IN PU T S ................................................................................................................................. 22 4.1 DATA AND PARAMETERS ................................................................................ 22 4.1.1 Elevation of Proposed Repository Above Sea Level ................................. 22 4.1.2 Components of Atmospheric Air Exclusive of Water and the Effective M olecular W eight ..................................................................................... 22 4.1.3 Water Vapor Pressure as a Function of Temperature ................................ 23 4.1.4 Density of Water as a Function of Temperature ....................................... 24 4.1.5 Surface Tension of Pure Water as a Function of Temperature .................. 25 4.1.6 Atomic and Molecular Weights of Various Elements and Molecules ..... 25 4.1.7 Ionization Constant for Water, Kw ............................................................ 26 4.1.8 Boiling Points of Saturated Solutions of Some Pure Salts ....................... 27 4.1.9 Equilibrium RH of Selected Saturated Salt Solutions from 0 to 100°C ........ 28 4.1.10 Solubilities of Ca, Mg, Na, and K Salts in Water ..................................... 28 4.1.11 Decomposition Temperatures of Some Bicarbonate/Carbonate Species ...... 31 4.1.12 Partial Pressure of HCI over Aqueous Solutions of HCI ........................... 31 4.1.13 Adsorbed Water Films as a Function of Relative Humidity and Tem perature .............................................................................................. 32 4.1.14 Vapor Pressure Lowering of Aqueous NaCl Solutions ............................. 34 4.1.15 Composition of J-13 Well Water .............................................................. 36 4.1.16 Composition of Porewaters from Topopah Springs welded unit (TSw) ....... 36 4.1.17 Henry's Law Constants for the Solubility of Oxygen in Several A queous Solutions ..................................................................................... 37 ANL-EBS-MD-000001 REV 00 3 March 2000 CONTENTS (Continued) Page 4.1.18 Effect of Boiling on the Solubility of Gases .............................................. 38 4.1.19 Silica Solubility in High pH Aqueous Solutions ....................................... 39 4.1.20 Evaporative/Boiling Concentrating of a Simulated J-13 Well Water Near the Boiling Point of the Concentrated Water (DTN: LL000202905924.117) .............................................................................. 39 4.1.21 Evaporative Concentrating of Simulated J- 13 Well Water at Temperatures Below the Boiling Point (DTN: LL000202905924.117) ........ 39 4.1.22 Gas Phase Compositions in the Emplacement Drifts ................................ 40 4.1.23 Future W ork .............................................................................................. 41 4.2 C R IT E R IA .................................................................................................................. 42 4.2.1 Uncanistered Spent Nuclear Fuel Disposal Container System Description Docum ent .............................................................................. 42 4.2.1.1 "System Performance Criteria" (Section 1.2.1) ....................... 42 4.2.1.2 System Environment Criteria (Section 1.2.3) ........................... 42 4.2.2 NRC Acceptance Criteria in Issue Resolution Status Reports for Key Technical Issues ......................................................................................... 43 4.3 CODES AND STANDARDS ................................................................................ 43 5. A SSU M PT IO N S .................................................................................................................... 43 6. A N A L Y SIS ............................................................................................................................ 45 6.1 IN TRO DU CTIO N ................................................................................................... 45 6.2 REPOSITORY CONDITIONS AFFECTING AQUEOUS SOLUTION PR O PE RT IE S ............................................................................................................. 47 6.2.1 Atmospheric Pressure at the Potential Repository Elevation .................... 47 6.2.2 Accessible Relative Humidity Conditions ................................................ 48 6.2.3 Effective RH at the DS and WPOB Surfaces ........................................... 49 6.2.4 Gas Phase Composition as a Function of RH ............................................ 49 6.2.5 O xygen Solubility ..................................................................................... 51 6.2.6 The Effect of CO2 Partial Pressure on Aqueous Solution pH ................... 54 6.3 WATER ADSORPTION ON SURFACES IN THE ABSENCE OF HYGROSCOPIC SALTS ...................................................................................... 54 6.3.1 Water Adsorption on Flat Surfaces as a Function of Temperature and R H ............................................................................................................ 54 6.3.2 Capillary Condensation as a Function of RH and Temperature ................ 54 6.3.3 Eh and pH in Aqueous Films in the Absence of Hygroscopic Salts ...... 56 6.4 CHARACTERISTICS OF AQUEOUS SALT SOLUTIONS ................................ 56 6.4.1 Deliquescence Points and Boiling Points for Pure Salts ........................... 57 6.4.2 Minimum RH for Aqueous Solution Formation Under the Potential Repository Conditions .............................................................................. 58 6.4.3 RH Effect on Aqueous Solution Composition .......................................... 59 6.5 THE EVOLUTION OF DILUTE NATURAL WATERS TO CONCENTRATED BRINES ................................................................................ 60 ANL-EBS-MD-000001 REV 00 4 March 2000 CONTENTS (Continued) Page 6.6 ESTIMATE OF BRINE FORMATION FROM YUCCA MOUNTAIN WATERS .............. ...................................... 61 6.6.1 Introduction ...............................................................................................