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Civilian Radioactive Waste Management System Management and Operating Contractor. Natural Analogue Synthesis Report.

DE2005836504

Publication Date	2002
Page Count	54
Abstract	The purpose of this report is to present analogue studies and literaturereviews designed to provide qualitative and quantitative information to test and provide added confidence in process models abstracted for performance assessment (PA) and model predictions pertinent to PA. This report provides updates to studies presented in the 'Yucca Mountain SiteDescription' (CRWMS M and O 2000 (151945), Section 13) and new examples gleaned from the literature, along with results of quantitative studies conducted specifically for the Yucca Mountain Site Characterization Project (YMP). The intent of the natural analogue studies was to collectcorroborative evidence from analogues to demonstrate additional understanding of processes expected to occur during postclosure at a potential Yucca Mountain repository. The report focuses on key processesby providing observations and analyses of natural and anthropogenic (human-induced) systems to improve understanding and confidence in the operation of these processes under conditions similar to those that could occur in a nuclear waste repository. The process models include those that represent both engineered and natural barrier processes. A second purpose of this report is to document the various applications ofnatural analogues to geologic repository programs, focusing primarily onthe way analogues have been used by the YMP. This report is limited to providing support for PA in a confirmatory manner and to providing corroborative inputs for process modeling activities. Section 1.7 discusses additional limitations of this report. Key topics for this report are analogues to emplacement drift degradation, waste form degradation, waste package degradation, degradation of other materials proposed for the engineered barrier, seepage into drifts, radionuclide flow and transport in the unsaturated zone (UZ), analogues to coupled thermal-hydrologic- mechanical-chemical processes, saturated zone (SZ) transport, impact of radionuclide release on the biosphere, and potentially disruptive events. Results of these studies will be used to corroborate estimates of the magnitude and limitation of operative processes in order to build realism into conceptual and numerical process models used as a foundation for PA in the representative case ofpostclosure safety.
Keywords	Radioactive waste management Natural analogue Literature review Performance evaluation Yucca Mountain Degradation Waste forms Simulation
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Bechtel SAIC Company, LLC., Las Vegas, NV.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200521

Civilian Radioactive Waste Management System Management and Operating Contractor. Natural Analogue Synthesis Report.

Civilian Radioactive Waste Management System Management and Operating Contractor. Natural Analogue Synthesis Report.
DE2005836504

Publication Date	2002
Page Count	54
Abstract	The purpose of this report is to present analogue studies and literaturereviews designed to provide qualitative and quantitative information to test and provide added confidence in process models abstracted for performance assessment (PA) and model predictions pertinent to PA. This report provides updates to studies presented in the 'Yucca Mountain SiteDescription' (CRWMS M and O 2000 (151945), Section 13) and new examples gleaned from the literature, along with results of quantitative studies conducted specifically for the Yucca Mountain Site Characterization Project (YMP). The intent of the natural analogue studies was to collectcorroborative evidence from analogues to demonstrate additional understanding of processes expected to occur during postclosure at a potential Yucca Mountain repository. The report focuses on key processesby providing observations and analyses of natural and anthropogenic (human-induced) systems to improve understanding and confidence in the operation of these processes under conditions similar to those that could occur in a nuclear waste repository. The process models include those that represent both engineered and natural barrier processes. A second purpose of this report is to document the various applications ofnatural analogues to geologic repository programs, focusing primarily onthe way analogues have been used by the YMP. This report is limited to providing support for PA in a confirmatory manner and to providing corroborative inputs for process modeling activities. Section 1.7 discusses additional limitations of this report. Key topics for this report are analogues to emplacement drift degradation, waste form degradation, waste package degradation, degradation of other materials proposed for the engineered barrier, seepage into drifts, radionuclide flow and transport in the unsaturated zone (UZ), analogues to coupled thermal-hydrologic- mechanical-chemical processes, saturated zone (SZ) transport, impact of radionuclide release on the biosphere, and potentially disruptive events. Results of these studies will be used to corroborate estimates of the magnitude and limitation of operative processes in order to build realism into conceptual and numerical process models used as a foundation for PA in the representative case ofpostclosure safety.
Keywords	Radioactive waste management Natural analogue Literature review Performance evaluation Yucca Mountain Degradation Waste forms Simulation
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Bechtel SAIC Company, LLC., Las Vegas, NV.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200521