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ANL-EBS-GS-000002, Rev. 01, Addendum DOC.20071106.0015 QA: QA ANL-EBS-GS-000002 REV 01 September 2006 Geochemistry Model Validation Report: External Accumulation Model THIS DOCUMENT CONTAINS THE FOLLOWING, LOCATED AT THE BACK OF THE DOCUMENT: 1) ADDENDUM 001, DATED 11/01/2007 Prepared for: U.S. Department of Energy Office of Civilian Radioactive Waste Management Office of Repository Development 1551 Hillshire Drive Las Vegas, Nevada 89134-6321 Prepared by: Bechtel SAIC Company, LLC 1180 Town Center Drive Las Vegas, Nevada 89144 Under Contract Number DE-AC28-01RW12101 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, nor any of their contractors, subcontractors or their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or any third party’s use or the results of such use 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 or its contractors or subcontractors. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. ANL-EBS-GS-000002 REV 01 September 2006 QA: QA Geochemistry Model Validation Report: External Accumulation Model ANL-EBS-GS-000002 REV 01 September 2006 ANL-EBS-GS-000002 REV 01 September 2006 Model Signature Page/Change History Page iii SSC Complete only applicable items. 1. Total Pages: 354 2. Type of Mathematical Model t8J Process Model o Abstraction Model o System Model Describe Intended Use of Model The results of the model will be used in external criticality risk assessments to support the postc]osure safety case. 3. Title Geochemistry Model Validation Report: External Accumulation Model 4. 01 (including Rev. No.): ANL-EBS-GS-000002 REV 01 Printed Name Signature Date 5. Originator Susan LeStrange 6. Independent Technical Rob Howard Reviewer 7. Checker William Downs 8. QER Paul Buenviaje 9 Responsible Manager/Lead Ernest Hardin 10. Responsible Manager Paul Dixon 11. Remarks The contributing originators are as follows: Susan LeStrange: all sections Wendy Mitcheltree: all sections Florie Caporuscio: 6.4.8, 7.2.3, Appendix B Jim Houseworth: 7.2.5, Appendices C, D, E, F and G Junghun Leem: 4.1.5, Appendix C Paul Mariner: 6.4.3, 7.1.1, 7.2.4 Jean-Philippe Nicot 6.4.7 James Schreiber: 6.4.6, 7:2.5 Kaveh zarr__a__bi' 6 5. 6.6. Change History .---------,-----------=------=-------------------------i I 12 RevIsion No 13. Description of Change I REV 00 Initiallssuc_ REV 01 Complete Revision. Revisions too eXlensive to use change bars. This revision will support JI 'Iir~solution ofkey technical issue agreements CLST 504, ENFE 5.03, and RT 4.03 and L- --.-J Condltlon Report._.(CR) 5904 _ Geochemistry Model Validation Report: External Accumulation Model ANL-EBS-GS-000002 REV 01 iv September 2006 Geochemistry Model Validation Report: External Accumulation Model CONTENTS Page ACRONYMS.............................................................................................................................. xvii 1. PURPOSE.............................................................................................................................. 1-1 2. QUALITY ASSURANCE..................................................................................................... 2-1 3. USE OF SOFTWARE ........................................................................................................... 3-1 3.1 SOFTWARE APPROVED FOR QA WORK .............................................................. 3-3 3.1.1 Overview of Software Use............................................................................. 3-3 3.1.2 Exempt Software............................................................................................ 3-3 3.1.3 PHREEQC Software Package........................................................................ 3-4 3.1.4 PHREEQC_Post V1.1.................................................................................... 3-5 3.1.5 GetEqPhases V1.0.......................................................................................... 3-5 3.1.6 Acc_with_decay V1.2.................................................................................... 3-5 3.1.7 MinAcc V1.0.................................................................................................. 3-5 3.1.8 EQ6 V7.2bLV and EQ3/6 V8.1..................................................................... 3-5 3.1.9 GetEqData V1.0.1.......................................................................................... 3-6 3.1.10 ASPRIN V1.0 ................................................................................................ 3-6 3.1.11 TOUGHREACT V3.0.................................................................................... 3-6 4. INPUTS.................................................................................................................................. 4-1 4.1 DIRECT INPUT ........................................................................................................... 4-1 4.1.1 Thermodynamic Database ............................................................................. 4-1 4.1.2 Mixing Water Composition ........................................................................... 4-2 4.1.3 Waste Package Releases ................................................................................ 4-5 4.1.4 Waste Package Flow Rate.............................................................................. 4-9 4.1.5 Self-Diffusion Coefficient of Water .............................................................. 4-9 4.1.6 Tuff Composition........................................................................................... 4-9 4.1.7 Dissolution Rates for Tuff Minerals ............................................................ 4-10 4.1.8 Invert Properties........................................................................................... 4-13 4.1.9 Adsorption Coefficients............................................................................... 4-14 4.1.10 Characteristics of Fractures, Matrix, and Lithophysae ................................ 4-15 4.1.11 Atomic Weights ........................................................................................... 4-15 4.1.12 Waste Package Dimensions ......................................................................... 4-15 4.1.13 Log K values used in Sensitivity Analyses for Uncertainty ........................ 4-16 4.1.14 Justification and Qualification of External Sources..................................... 4-16 4.2 CRITERIA .................................................................................................................. 4-19 4.2.1 Regulatory Requirements............................................................................. 4-19 4.2.2 Other Requirements—Disposal Criticality Analysis Methodology Topical Report ............................................................................................. 4-20 4.3 CODES, STANDARDS, AND REGULATIONS...................................................... 4-20 ANL-EBS-GS-000002 REV 01 v September 2006 Geochemistry Model Validation Report: External Accumulation Model CONTENTS (Continued) Page 5. ASSUMPTIONS.................................................................................................................... 5-1 5.1 DISCUSSION OF ASSUMPTIONS IN UPSTREAM DOCUMENTATION ............ 5-1 5.1.1 Bulk Water Chemistry (Assumption 5.1 of Material Degradation and Release Model) .............................................................................................. 5-1 5.1.2 Constant Surface Area and Corrosion Rates of Alloys (Assumption 5.2 of Material Degradation and Release Model)................................................ 5-2 5.1.3 Thermodynamic Equilibrium (Assumption 5.3 of Material Degradation and Release Model)........................................................................................ 5-2 5.2 ASSUMPTIONS INTERNAL TO EXTERNAL ACCUMULATION MODEL......... 5-3 5.2.1 Carbon Dioxide Conditions ........................................................................... 5-3 5.2.2 Oxidizing Conditions..................................................................................... 5-3 5.2.3 Seepage Rates ................................................................................................ 5-4 6. MODEL DISCUSSION......................................................................................................... 6-1 6.1 OBJECTIVES............................................................................................................... 6-1 6.2 CONCEPTUAL MODEL............................................................................................. 6-1 6.3 NOMINAL CASE—DIFFUSIVE RELEASES—SCOPING CALCULATIONS ...... 6-8 6.3.1 Scoping Results.............................................................................................. 6-9 6.4 SEISMIC FAULT DISPLACEMENT AND IGNEOUS CASES—DISSOLVED RELEASES................................................................................................................
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