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Thermal-Hydrologic-Mechanical Study of Pre-Closure Off-Normal Thermal Scenarios at Proposed Yucca Mountain Nuclear Waste Repository.

DE2005838907

Publication Date	2005
Page Count	12
Abstract	The proposed nuclear waste repository at Yucca Mountain, Nevada currently includes a minimum of 50 years forced ventilation inside of emplacement drifts prior to repository closure. To regulate the heat generated from emplaced waste packages, the ventilation during the pre-closure period should be continuous. Off-normal thermal scenarios that consider temporary shutdown of the pre-closure ventilation are investigated to determine the impacts of ventilation shutdown on the thermal-hydrologic-mechanical behaviors of the emplacement drifts. In-drift heat transfer processes including radiation, convection, and conduction are studied. The analysis provides a ventilation heat removal ratio that varies on the drift location and the ventilation duration. The heat removal ratio is transferred and utilized in the NUFT thermal-hydrology software. The NUFT software is used to investigate the thermal-hydrologic impacts on the repository rock mass for the off-normal thermal scenarios with various shutdown durations at various pre-closure times. The predicted rock mss temperature evaluated from the thermalhydrologic analysis is applied for the thermal-mechanical analysis of the off-normal thermal scenarios. The results show that degradation and rockfall of the emplacement drifts due to the off-normal thermal scenarios will be minimal, and it is concluded that the impacts of off-normal thermal scenarios on the stability of the emplacement drifis will be insignificant.
Keywords	Biomass Radioactive waste disposal Soils Greenhouse gases Desulfurization Geology Toxicity Yucca Mountain
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Bechtel SAIC Com., Las Vegas, NV.; Department of Energy, Washington, DC.; Itasca Consulting Group, Inc., Minneapolis, MN.
Supplemental Notes	Prepared in cooperation with Itasca Consulting Group, Inc., Minneapolis, MN. Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200614

Thermal-Hydrologic-Mechanical Study of Pre-Closure Off-Normal Thermal Scenarios at Proposed Yucca Mountain Nuclear Waste Repository.

Thermal-Hydrologic-Mechanical Study of Pre-Closure Off-Normal Thermal Scenarios at Proposed Yucca Mountain Nuclear Waste Repository.
DE2005838907

Publication Date	2005
Page Count	12
Abstract	The proposed nuclear waste repository at Yucca Mountain, Nevada currently includes a minimum of 50 years forced ventilation inside of emplacement drifts prior to repository closure. To regulate the heat generated from emplaced waste packages, the ventilation during the pre-closure period should be continuous. Off-normal thermal scenarios that consider temporary shutdown of the pre-closure ventilation are investigated to determine the impacts of ventilation shutdown on the thermal-hydrologic-mechanical behaviors of the emplacement drifts. In-drift heat transfer processes including radiation, convection, and conduction are studied. The analysis provides a ventilation heat removal ratio that varies on the drift location and the ventilation duration. The heat removal ratio is transferred and utilized in the NUFT thermal-hydrology software. The NUFT software is used to investigate the thermal-hydrologic impacts on the repository rock mass for the off-normal thermal scenarios with various shutdown durations at various pre-closure times. The predicted rock mss temperature evaluated from the thermalhydrologic analysis is applied for the thermal-mechanical analysis of the off-normal thermal scenarios. The results show that degradation and rockfall of the emplacement drifts due to the off-normal thermal scenarios will be minimal, and it is concluded that the impacts of off-normal thermal scenarios on the stability of the emplacement drifis will be insignificant.
Keywords	Biomass Radioactive waste disposal Soils Greenhouse gases Desulfurization Geology Toxicity Yucca Mountain
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Bechtel SAIC Com., Las Vegas, NV.; Department of Energy, Washington, DC.; Itasca Consulting Group, Inc., Minneapolis, MN.
Supplemental Notes	Prepared in cooperation with Itasca Consulting Group, Inc., Minneapolis, MN. Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200614