Discrete-fracture modeling of thermal-hydrological processes at Yucca Mountain and the LLNL G-Tunnel heater test

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An in situ heater test was performed at G-Tunnel, Nevada Nuclear Test Site, to investigate the thermal-hydrological response of unsaturated, fractured volcanic tuff under conditions similar to those at Yucca Mountain. The NUFT flow and transport code was used to model the test using discrete-fracture and equivalent-continuum approaches. Nonequilibrium fracture flow and thermal buoyant gas-phase convection were found to be the likely causes for observed lack of condensate imbibition into the matrix. The potential repository at Yucca Mountain was also modeled. Disequilibrium fracture flow is predicted to occur for less than a hundred years after emplacement followed by a period ... continued below

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11 p.

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Nitao, J.J. & Buscheck, T.A. November 9, 1995.

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An in situ heater test was performed at G-Tunnel, Nevada Nuclear Test Site, to investigate the thermal-hydrological response of unsaturated, fractured volcanic tuff under conditions similar to those at Yucca Mountain. The NUFT flow and transport code was used to model the test using discrete-fracture and equivalent-continuum approaches. Nonequilibrium fracture flow and thermal buoyant gas-phase convection were found to be the likely causes for observed lack of condensate imbibition into the matrix. The potential repository at Yucca Mountain was also modeled. Disequilibrium fracture flow is predicted to occur for less than a hundred years after emplacement followed by a period of fracture-matrix equilibrium, during which the equivalent-continuum and discrete-fracture models give almost identical results.

Physical Description

11 p.

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INIS; OSTI as DE96007700

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  • Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 27 Nov - 1 Dec 1995

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  • Other: DE96007700
  • Report No.: UCRL-JC--121231
  • Report No.: CONF-951155--53
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 206653
  • Archival Resource Key: ark:/67531/metadc669910

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  • November 9, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Feb. 23, 2016, 1:27 p.m.

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Nitao, J.J. & Buscheck, T.A. Discrete-fracture modeling of thermal-hydrological processes at Yucca Mountain and the LLNL G-Tunnel heater test, article, November 9, 1995; California. (digital.library.unt.edu/ark:/67531/metadc669910/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.