Total-system performance assessment for Yucca Mountain -- SNL second iteration (TSPA-1993); Executive summary

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Sandia National Laboratories has completed the second iteration of the periodic total-system performance assessments (TSPA-93) for the Yucca Mountain Site Characterization Project (YMP). Scenarios describing expected conditions (aqueous and gaseous transport of contaminants) and low-probability events (human-intrusion drilling and volcanic intrusion) are modeled. The hydrologic processes modeled include estimates of the perturbations to ambient conditions caused by heating of the repository resulting from radioactive decay of the waste. TSPA-93 incorporates significant new detailed process modeling, including two- and three-dimensional modeling of thermal effects, groundwater flow in the saturated-zone aquifers, and gas flow in the unsaturated zone. Probabilistic analyses are performed ... continued below

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67 p.

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Wilson, M.L.; Barnard, R.W. & Gauthier, J.H. April 1, 1994.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Sandia National Laboratories has completed the second iteration of the periodic total-system performance assessments (TSPA-93) for the Yucca Mountain Site Characterization Project (YMP). Scenarios describing expected conditions (aqueous and gaseous transport of contaminants) and low-probability events (human-intrusion drilling and volcanic intrusion) are modeled. The hydrologic processes modeled include estimates of the perturbations to ambient conditions caused by heating of the repository resulting from radioactive decay of the waste. TSPA-93 incorporates significant new detailed process modeling, including two- and three-dimensional modeling of thermal effects, groundwater flow in the saturated-zone aquifers, and gas flow in the unsaturated zone. Probabilistic analyses are performed for aqueous and gaseous flow and transport, human intrusion, and basaltic magmatic activity. Results of the calculations lead to a number of recommendations concerning studies related to site characterization. Primary among these are the recommendations to obtain better information on percolation flux at Yucca Mountain, on the presence or absence of flowing fractures, and on physical and chemical processes influencing gaseous flow. Near-field thermal and chemical processes, and waste-container degradation are also areas where additional investigations may reduce important uncertainties. Recommendations for repository and waste-package design studies are: (1) to evaluate the performance implications of large-size containers, and (2) to investigate in more detail the implications of high repository thermal power output on the adjacent host rock and on the spent fuel.

Physical Description

67 p.

Notes

INIS; OSTI as DE94012995

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  • Other Information: PBD: Apr 1994

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  • Other: DE94012995
  • Report No.: SAND--93-2675
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/145192 | External Link
  • Office of Scientific & Technical Information Report Number: 145192
  • Archival Resource Key: ark:/67531/metadc621942

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  • April 1, 1994

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  • June 16, 2015, 7:43 a.m.

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  • April 14, 2016, 1:52 p.m.

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Wilson, M.L.; Barnard, R.W. & Gauthier, J.H. Total-system performance assessment for Yucca Mountain -- SNL second iteration (TSPA-1993); Executive summary, report, April 1, 1994; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc621942/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.