Heat-pipe effect on the transport of gaseous radionuclides released from a nuclear waste container

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When an unsaturated porous medium is subjected to a temperature gradient and the temperature is sufficiently high, vadose water is heated and vaporizes. Vapor flows under its pressure gradient towards colder regions where it condenses. Vaporization and condensation produce a liquid saturation gradient, creating a capillary pressure gradient inside the porous medium. Condensate flows towards the hot end under the influence of a capillary pressure gradient. This is a heat pipe in an unsaturated porous medium. We study analytically the transport of gaseous species released from a spent-fuel waste package, as affected by a time-dependent heat pipe in an unsaturated ... continued below

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11 p.

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Zhou, W.; Chambre, P.L.; Pigford, T.H. & Lee, W.W.L. November 1, 1990.

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When an unsaturated porous medium is subjected to a temperature gradient and the temperature is sufficiently high, vadose water is heated and vaporizes. Vapor flows under its pressure gradient towards colder regions where it condenses. Vaporization and condensation produce a liquid saturation gradient, creating a capillary pressure gradient inside the porous medium. Condensate flows towards the hot end under the influence of a capillary pressure gradient. This is a heat pipe in an unsaturated porous medium. We study analytically the transport of gaseous species released from a spent-fuel waste package, as affected by a time-dependent heat pipe in an unsaturated rock. For parameter values typical of a potential repository in partially saturated fractured tuff at Yucca Mountain, we found that a heat pipe develops shortly after waste is buried, and the heat-pipe`s spatial extent is time-dependent. Water vapor movements produced by the heat pipe can significantly affect the migration of gaseous radionuclides. 12 refs., 6 figs., 1 tab.

Physical Description

11 p.

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INIS; OSTI as DE91011893

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  • Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 24 Nov - 1 Dec 1990

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  • Other: DE91011893
  • Report No.: LBL--29064
  • Report No.: CONF-901105--119
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 138099
  • Archival Resource Key: ark:/67531/metadc623158

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  • November 1, 1990

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  • June 16, 2015, 7:43 a.m.

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  • April 5, 2016, 11:40 a.m.

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Zhou, W.; Chambre, P.L.; Pigford, T.H. & Lee, W.W.L. Heat-pipe effect on the transport of gaseous radionuclides released from a nuclear waste container, article, November 1, 1990; California. (digital.library.unt.edu/ark:/67531/metadc623158/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.