Method development and strategy for the characterization of complexly faulted and fractured rhyolitic tuffs, Yucca Mountain, Nevada, USA

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Field experimental and analytical methods development is underway to define the hydraulic and transport properties of a thick saturated zone that underlies the planned high-level nuclear waste repository at Yucca Mountain, Nevada. The characterization strategy for the highly heterogeneous hydrology is that of hypothesis testing and confidence building. Three test wells, the UE-25c-holes, have been drilled and preliminary data have been collected. Hydro-mechanical analyses indicate formation fluid at depth is hydraulically connected to the water table. Preliminary hydraulic tests indicate highly localized, fracture-controlled transmissivity. Cross-hole seismic tomography is planned to assess the inter-borehole structure of fractures and faults. Multi-level cross-hole ... continued below

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15 p.

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Karasaki, K. & Galloway, D. October 1, 1990.

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  • Karasaki, K. Lawrence Berkeley Lab., CA (USA)
  • Galloway, D. Geological Survey, Sacramento, CA (USA). Water Resources Div.

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Description

Field experimental and analytical methods development is underway to define the hydraulic and transport properties of a thick saturated zone that underlies the planned high-level nuclear waste repository at Yucca Mountain, Nevada. The characterization strategy for the highly heterogeneous hydrology is that of hypothesis testing and confidence building. Three test wells, the UE-25c-holes, have been drilled and preliminary data have been collected. Hydro-mechanical analyses indicate formation fluid at depth is hydraulically connected to the water table. Preliminary hydraulic tests indicate highly localized, fracture-controlled transmissivity. Cross-hole seismic tomography is planned to assess the inter-borehole structure of fractures and faults. Multi-level cross-hole hydraulic interference and tracer tests are planned using up to 5 packed-off zones in each of the c-holes to assess the hydraulic conductivity and transport structure in a crude tomographic fashion. An equivalent discontinuum model conditioned with the observed hydraulic measurements will be applied to interpret the hydraulic test responses. As an approach to the scale problem the tests will be designed and analyzed to examine the hypothesis that the flow system may be represented by fractal geometry. 12 refs., 4 figs.

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15 p.

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INIS; OSTI as DE91009092

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  • Nuclear Energy Agency (NEA) workshop on flow heterogeneity and site evaluation, Paris (France), 22-24 Oct 1990

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  • Other: DE91009092
  • Report No.: LBL--30146
  • Report No.: CONF-9010214--2
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 138037
  • Archival Resource Key: ark:/67531/metadc624183

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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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  • October 1, 1990

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  • June 16, 2015, 7:43 a.m.

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  • April 5, 2016, 12:28 p.m.

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Karasaki, K. & Galloway, D. Method development and strategy for the characterization of complexly faulted and fractured rhyolitic tuffs, Yucca Mountain, Nevada, USA, article, October 1, 1990; California. (digital.library.unt.edu/ark:/67531/metadc624183/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.