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Performance Confirmation Concepts Study Report

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Performance Confirmation Concepts Study Report TRW Environmental Safety Systems Inc. Performance Confirmation Concepts Study Report Civilian Radioactive Waste Management System Management &Operating Contractor B&W Federal Services JK Research Associates, Inc. SAIC Duke Engineering & Services, Inc. Kiewlt/Parsons Brinckerhoff Sandia National Laboratories E.R. Johnson Associates, Inc. Lawrence Berkeley Laboratory TRW Environmental Safety Systems Inc. Fluor Daniel, Inc. Lawrence Livermore National Laboratory Woodward-Clyde Federal Services Framatome Cogema Fuels Logicon RDA Winston & Strawn Integrated Resources Group Los Alamos National Laboratory CooperatingFederal Agency: INTERA, Inc. Morrison-Knudsen Corporation U.S. Geological Survey Prepar ed by: Prepared for: TRW Environmental Safety U.S. Department of Energy Systenns Inc. Office of Civilian Radioactive Waste Management 1000 Independence Avenue, S.W. Washington, D.C. 20565 970 1290259 -9611227 PDR WASTE WM-I I PDR WBS: 1.2.1.5 SCPB: 8.3.5.16 QA: L Title Page 1 of 2 Civilian Radioactive Waste Management System Management and Operating Contractor Performance Confirmation Concepts Study Report BOOOOOOOO-01717-5705-00035 REV 01 November 22, 1996 Prepared for: U.S. Department of Energy Yucca Mountain Site Characterization Project P.O. Box 98608 Las Vegas, Nevada 89193-8608 Prepared by: TRW Environmental Safety Systems, Inc. !o),; . 101 Convention Center Drive Suite P-110 Las Vegas, Nevada 89109-2006 Under Contract Number C.,,.. DE-AC01-91RW00134 INTENTIONALLY LEFF BLANK BOOOOOOOO-01717-5705-00035 REV 01 November 22, 1996 WBS: 1.2.1.5 SCPB: 8.3.5.16 QA: L Title Page 2 of 2 Civilian Radioactive Waste Management System Management and Operating Contractor Performance Confirmation Concepts Study Report Document Identifier Number I BOOOOOOO-01717-5705-00035 REV 01 November 22, 1996 Lead Document Preparer: Brent H. Thomson Signature' Study Manager, Date Systems Analysis and Modeling Concurrence by: O. J. Gilstrap Signature Manager, Quality Date Engineering, Nevada Approved by: Richard D. Memory (f-22 -F Department Manager, Signature Date Systems Analysis and Modeling Richard C. Wagner Office Manager, signtureU Date Systems Engineering INTENTIONALLY LEFT BLANK BOOOOOOOO-01717-5705-00035 REV 01 November 22, 1996 ACKNOWLEDGMENTS The following individuals are acknowledged for the support and participation in the integrated product team, the performance confirmation concepts study team, that was organized to conduct this study: James A. Blink, MGDS Project Engineering; Albin Brandstetter, Performance Assessment; Mark Fortsch, Repository Design Surface; Phillip D. Gehner, Systems Analysis and Modeling; Hemendra Kalia, MGDS Project Engineering; Ovadia Lev, Requirements; Douglas McAffee, Repository Design Subsurface; J. Kevin McCoy, Waste Package Development; R. Daniel McCright, Waste Package Materials; Daniel G. McKenzie, Repository Design Subsurface; Prasad Nair, formerly with System Engineering; Mark T. Peters, Scientific Program Operations; Mark D. Sellers, MGDS Project Engineering; David Stahl, Waste Package Materials. These team members participated in many meetings which supported the study. Those individuals that provided input to the report are in bold type above and are considered as co-authors of the report. The support of all these individuals and organizations is appreciated by the lead document preparer and is gratefully acknowledged. Additional support for the study was provided by the following individuals in the contributions made by the authors of certain areas of the report: Darren Jolley, Derick McWilliams, Thomas Scotese. BOOOOOOOO-01717-5705-00035 Rev. 01 V November 22, 1996 INTENTIONALLY LEFT BLANK j BOOOOOOOO-01717-5705-00035 Rev. 01 vi November 22, 1996 I EXECUTIVE SUMMARY This report documents the work performed to conduct the Fiscal Year 1996 Performance Confirmation Concepts Study. The report also documents the study conclusions and recommendations. The objective of the study was to develop technically based recommendations, regarding the extent and content of the Performance Confirmation Program as required by Title 10 Code of Federal Regulations (CFR) Part 60, Subpart F. The scope of the FY96 study was to focus on the Performance Confirmation requirements and concepts with potential impact on repository/waste package design and/or operation. Performance Confirmation is defined in 10 CFR Part 60.2 as "the program of tests, experiments, and analyses which is conducted to evaluate the accuracy and adequacy of the information used to determine with reasonable assurance that the performance objectives for the period after permanent I closure will be met." Subpart F of 10 CFR Part 60 provides general requirements for a Performance Confirmation program, as well as more specific requirements related to confirmation of geotechnical and design parameters, design testing, and monitoring and testing of waste packages. This study began with these requirements as regulatory constraints and expanded them to a lower level of detail so that they could be implemented in the repository design. If a regulatory constraint became overly restrictive in terms of design solutions then that constraint was noted for potential discussion with the NRC. The first step in developing requirements and concepts for the Performance Confirmation program was to identify candidate parameters related to Performance Confirmation that may need to be tested or analyzed to confirm that the post closure performance objectives will be met. These parameters I were identified by considering key post-closure performance objectives (e.g., limiting 10,000 year peak dose, achieving substantially complete containment, etc.) and identifying the models used to evaluate these post closure objectives together with the process-level models used to support these evaluations. Once the process models and model abstractions were identified, the parameters used in these models were identified, resulting in a list of approximately 480 different parameters. A complete list of these parameters is provided in Appendix B. Screening criteria (e.g., time dependent parameter, important to waste isolation calculations, affected by construction, etc.) were then developed to identify a subset of these parameters as performance confirmation parameters. A final screening of the parameters was conducted to identify key parameters whose observation, monitoring, or testing could have a potentially significant influence on the design of the repository or engineered barrier system. This screening resulted in a smaller list of about 90 parameters. These parameters are listed in full in Appendix D, but include items such as saturated hydraulic conductivity, rock temperature, fracture and fault zone characteristics, groundwater chemical characteristics, etc. The next step in the process was to develop concepts for collecting performance confirmation information for each of the key parameters. These concepts were then organized into three major areas. These areas were monitoring and testing concepts (including site, repository, and waste package concepts), test facilities and support concepts (including subsurface and surface concepts), and evaluation and reporting concepts. Options within each of the concepts were then developed so that a nominal case and an enhanced case could be developed for each of the concepts. The nominal option consists of a set of performance confirmation tests and functions that, in the study team's judgement, would provide adequate confidence in the ability of the performance confirmation process BOOOOOOOO-01717-5705-00035 REV 01 vii November 22, 1996 to meet regulatory requirements and to support accurate assessment of subsurface conditions, changes in those conditions, and proper functioning of the natural and engineered barriers. The enhanced option consists of a set of performance confirmation tests and functions that potentially would provide a higher level of confidence than would the nominal case. The level of confidence required will be established through additional quantitative, statistical bases in conjunction with regulatory interaction and policy direction. The final steps in the process were to develop evaluation criteria and then evaluate the options against those criteria. The quantitative evaluation criteria used to develop a recommendation between the enhanced and nominal options was the absolute cost of each option and the delta cost between the options. The potential impact of the testing concepts on waste isolation was also considered in evaluating and recommending the test them. The costs for the suite of enhanced options was estimated to be approximately $2.2 billion, while the cost of the nominal options was $0.7 billion. This is compared to the $0.6 billion estimate for the Advanced Conceptual Design reference case. Additionally, no difference between the options, in terms of impact on waste isolation, was identified presuming that effective borehole and excavation seals can be developed and installed. It was also determined that adequate controls will be possible for either of the options to prevent significant long-term impacts on waste isolation. Given the above evaluation, it is the recommendation of this study to pursue and establish the specific requirements for the nominal case. The following is a partial list (paraphrased in some cases) of the requirements derived for the nominal option. The full list of recommended design requirements can be found in Section 8. Performance Confirmation Monitoring and Testing Requirements
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