Towards a realistic approach to validation of reactive transport models for performance assessment

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Performance assessment calculations are based on geochemical models that assume that interactions among radionuclides, rocks and groundwaters under natural conditions, can be estimated or bound by data obtained from laboratory-scale studies. The data include radionuclide distribution coefficients, measured in saturated batch systems of powdered rocks, and retardation factors measured in short-term column experiments. Traditional approaches to model validation cannot be applied in a straightforward manner to the simple reactive transport models that use these data. An approach to model validation in support of performance assessment is described in this paper. It is based on a recognition of different levels of ... continued below

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30 p.

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Siegel, M.D. December 31, 1993.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Performance assessment calculations are based on geochemical models that assume that interactions among radionuclides, rocks and groundwaters under natural conditions, can be estimated or bound by data obtained from laboratory-scale studies. The data include radionuclide distribution coefficients, measured in saturated batch systems of powdered rocks, and retardation factors measured in short-term column experiments. Traditional approaches to model validation cannot be applied in a straightforward manner to the simple reactive transport models that use these data. An approach to model validation in support of performance assessment is described in this paper. It is based on a recognition of different levels of model validity and is compatible with the requirements of current regulations for high-level waste disposal. Activities that are being carried out in support of this approach include (1) laboratory and numerical experiments to test the validity of important assumptions inherent in current performance assessment methodologies,(2) integrated transport experiments, and (3) development of a robust coupled reaction/transport code for sensitivity analyses using massively parallel computers.

Physical Description

30 p.

Notes

INIS; OSTI as DE94005249

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  • Focus 93: site characterization and model validation, Las Vegas, NV (United States), 26-29 Sep 1993

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  • Other: DE94005249
  • Report No.: SAND--93-2507C
  • Report No.: CONF-9309228--8
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 140468
  • Archival Resource Key: ark:/67531/metadc620734

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Office of Scientific & Technical Information Technical Reports

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Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • December 31, 1993

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  • June 16, 2015, 7:43 a.m.

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  • April 14, 2016, 1:52 p.m.

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Siegel, M.D. Towards a realistic approach to validation of reactive transport models for performance assessment, article, December 31, 1993; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc620734/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.