Sensitivity of the engineered barrier system (EBS) release rate to alternative conceptual models of advective release from waste packages under dripping fractures

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The first model assumed that dripping water directly contacts the waste form inside the ``failed`` waste package and radionuclides are released from the EBS by advection. The second model assumed that dripping water is diverted around the package (because of corrosion products plugging the perforations), thereby being prevented from directly contacting the waste form. In the second model, radionuclides were assumed to diffuse through the perforations, and, once outside the waste package, to be released from the EBS by advection. For the case with the second EBS release model, most radionuclides had lower peak EBS release rates than with the ... continued below

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12 p.

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Lee, J.H.; Atkins, J.E.; McNeish, J.A. & Vallikat, V. September 1, 1996.

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Description

The first model assumed that dripping water directly contacts the waste form inside the ``failed`` waste package and radionuclides are released from the EBS by advection. The second model assumed that dripping water is diverted around the package (because of corrosion products plugging the perforations), thereby being prevented from directly contacting the waste form. In the second model, radionuclides were assumed to diffuse through the perforations, and, once outside the waste package, to be released from the EBS by advection. For the case with the second EBS release model, most radionuclides had lower peak EBS release rates than with the first model. Impacts of the alternative EBS release models were greater for the radionuclides with low solubility. The analysis indicated that the EBS release model representing advection through a ``failed`` waste package (the first model) may be too conservative; thus a ``failed`` waste package container with multiple perforations may still be an important barrier to radionuclide release.

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12 p.

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INIS; OSTI as DE96015256

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  • Canadian Nuclear Society (CNS) international conference on deep geological disposal of radioactive waste, Winnipeg (Canada), 15-18 Sep 1996

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  • Other: DE96015256
  • Report No.: CONF-960911--3
  • Grant Number: AC01-91RW00134
  • Office of Scientific & Technical Information Report Number: 372667
  • Archival Resource Key: ark:/67531/metadc682116

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  • September 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Dec. 3, 2015, 8 p.m.

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Lee, J.H.; Atkins, J.E.; McNeish, J.A. & Vallikat, V. Sensitivity of the engineered barrier system (EBS) release rate to alternative conceptual models of advective release from waste packages under dripping fractures, article, September 1, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc682116/: accessed November 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.