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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

  • Biomass
  • Radioactive waste disposal
  • Soils
  • Greenhouse gases
  • Desulfurization
  • Geology
  • Toxicity
  • Yucca Mountain
  • Technical Information Center Oak Ridge Tennessee
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