Transport code for radiocolloid migration: with an assessment of an actual low-level waste site

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Description

Recently, there is increased concern that radiocolloids may act as a rapid transport mechanism for the release of radionuclides from high-level waste repositories. The role of colloids is, however, controversial because the necessary data and assessment methodology have been limited. Evidence is accumulating to indicate that colloids are an important consideration in the geological disposal of nuclear waste. To quantitatively assess the role of colloids, the TRACR3D transport code has been enhanced by the addition of the population balance equations. This new version of the code can simulate the migration of colloids through combinations of porous/fractured, unsaturated, geologic media. The ... continued below

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12 p.

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Travis, B.J. & Nuttall, H.E. December 31, 1984.

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Description

Recently, there is increased concern that radiocolloids may act as a rapid transport mechanism for the release of radionuclides from high-level waste repositories. The role of colloids is, however, controversial because the necessary data and assessment methodology have been limited. Evidence is accumulating to indicate that colloids are an important consideration in the geological disposal of nuclear waste. To quantitatively assess the role of colloids, the TRACR3D transport code has been enhanced by the addition of the population balance equations. This new version of the code can simulate the migration of colloids through combinations of porous/fractured, unsaturated, geologic media. The code was tested against the experimental laboratory column data of Avogadro et al. in order to compare the code results to both experimental data and an analytical solution. Next, a low-level radioactive waste site was investigated to explore whether colloid migration could account for the unusually rapid and long transport of plutonium and americium observed at a low-level waste site. Both plutonium and americium migrated 30 meters through unsaturated volcanic tuff. The nature and modeling of radiocolloids are discussed along with site simulation results from the TRACR3D code. 20 references.

Physical Description

12 p.

Notes

NTIS, PC A02/MF A01; OSTI as DE85005576

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  • Materials Research Society annual meeting, Boston, MA (United States), 26-29 Nov 1984

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  • Other: DE85005576
  • Report No.: LA-UR--84-3954
  • Report No.: CONF-841157--69
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 60555
  • Archival Resource Key: ark:/67531/metadc697603

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  • December 31, 1984

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  • Aug. 14, 2015, 8:43 a.m.

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  • July 28, 2016, 7:28 p.m.

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Travis, B.J. & Nuttall, H.E. Transport code for radiocolloid migration: with an assessment of an actual low-level waste site, article, December 31, 1984; New Mexico. (digital.library.unt.edu/ark:/67531/metadc697603/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.