The effective diffusion coefficient for porous rubble

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Each waste package in the proposed Yucca Mountain repository is to be separated from surrounded unsaturated rock by a 2-cm air gap annulus. However, if the annulus becomes filled with rock and rubble, there can exist pathways for diffusive release of radionuclides through pore liquid, even if the repository remains unsaturated. The effective diffusion coefficient for radionuclide release through pore liquid in a rubble bed depends on the porosity and moisture content of rubble material and on the geometry and contact area of individual pieces of rubble. Here we present a theoretical analysis of the effective diffusion coefficient for a ... continued below

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5 p.

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Sadeghi, M.M.; Lee, W.W.-L.; Pigford, T.H. & Chambre, P.L. January 1, 1990.

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Description

Each waste package in the proposed Yucca Mountain repository is to be separated from surrounded unsaturated rock by a 2-cm air gap annulus. However, if the annulus becomes filled with rock and rubble, there can exist pathways for diffusive release of radionuclides through pore liquid, even if the repository remains unsaturated. The effective diffusion coefficient for radionuclide release through pore liquid in a rubble bed depends on the porosity and moisture content of rubble material and on the geometry and contact area of individual pieces of rubble. Here we present a theoretical analysis of the effective diffusion coefficient for a bed of rubble spheres. The results give a rough indication of the magnitude of the effective diffusion coefficient, and the analysis identifies the parameters that will affect experimental measurements of mass transfer through unsaturated rubble. 3 refs., 1 fig.

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5 p.

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INIS; OSTI as DE90014037

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  • American Nuclear Society (ANS) annual meeting, Nashville, TN (United States), 10-14 Jun 1990

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  • Other: DE90014037
  • Report No.: LBL--28429
  • Report No.: CONF-900608--45
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 137765
  • Archival Resource Key: ark:/67531/metadc621528

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  • January 1, 1990

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  • June 16, 2015, 7:43 a.m.

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  • April 4, 2016, 9:18 p.m.

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Sadeghi, M.M.; Lee, W.W.-L.; Pigford, T.H. & Chambre, P.L. The effective diffusion coefficient for porous rubble, article, January 1, 1990; California. (digital.library.unt.edu/ark:/67531/metadc621528/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.