Two-phase unsaturated flow at Yucca Mountain, Nevada - A Report on Current Understanding

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Description

The U.S. civilian nuclear waste program is unique in its focus on disposal of high-level wastes in the unsaturated zone (UZ), above the water table. The potential repository site currently under investigation is located in a semi-arid region of the southwestern U.S. at Yucca Mountain, Nevada. The geology of the site consists of layered sequences of faulted, fractured, and bedded tuffs. The groundwater table is approximately 600 m beneath the land surface, while the proposed repository horizon is at a nominal depth of approximately 375 m. In this kind of environment, two-phase flow is not just a localized perturbation to ... continued below

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42 p.

Creation Information

Pruess, K. August 1, 1998.

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Description

The U.S. civilian nuclear waste program is unique in its focus on disposal of high-level wastes in the unsaturated zone (UZ), above the water table. The potential repository site currently under investigation is located in a semi-arid region of the southwestern U.S. at Yucca Mountain, Nevada. The geology of the site consists of layered sequences of faulted, fractured, and bedded tuffs. The groundwater table is approximately 600 m beneath the land surface, while the proposed repository horizon is at a nominal depth of approximately 375 m. In this kind of environment, two-phase flow is not just a localized perturbation to natural conditions, as in the saturated zone, but is the predominant mode of water and gas flow. The purpose of this report is to review the current understanding of gas and water flow, and mass transport, in the unique hydrogeologic environment of Yucca Mountain. Characteristics of the Yucca Mountain site are examined, and concepts and mathematical modeling approaches are described for variably saturated flow in thick unsaturated zones of fractured rock. The paper includes a brief summary of the disposal concept and repository design, as developed by a team of engineering contractors to the U.S. Department of Energy (DOE), with strong participation from the DOE National Laboratories.

Physical Description

42 p.

Notes

OSTI as DE00006514

Medium: P; Size: 42 pages

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  • Other Information: Supercedes report DE00006514; PBD: 1 Aug 1998

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  • Report No.: LBNL--42075
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/6514 | External Link
  • Office of Scientific & Technical Information Report Number: 6514
  • Archival Resource Key: ark:/67531/metadc705967

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • August 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 12, 2017, 3:35 p.m.

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Pruess, K. Two-phase unsaturated flow at Yucca Mountain, Nevada - A Report on Current Understanding, report, August 1, 1998; California. (digital.library.unt.edu/ark:/67531/metadc705967/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.