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Source-Term Comparison Using the Arest and Syvac-Vault Models: Effects of Decay-Chain In-Growth and Precipitation

Published online by Cambridge University Press:  26 February 2011

M. J. Apted ,
D. W. Engel ,
N. C. Garisto  and
D. M. Leneveu
M. J. Apted
Affiliation:
Pacific Northwest Laboratory, Richland, Washington, U. S. A.99352
D. W. Engel
Affiliation:
Pacific Northwest Laboratory, Richland, Washington, U. S. A.99352
N. C. Garisto
Affiliation:
Whiteshell Nuclear Research Establishment, Pinawa, Manitoba, CanadaROE 1 LO.
D. M. Leneveu
Affiliation:
Whiteshell Nuclear Research Establishment, Pinawa, Manitoba, CanadaROE 1 LO.
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Abstract

A series of calculations of radionuclide release was performed with the AREST and SYVAC-Vault models (SVM) in order to assess concurrance. Specifically, the effects of precipitation and decay chain in-growth on the predicted release of nuclides from waste packages containing spent nuclear fuel were compared between each code. The results for maximum release rates generally agreed within a factor of 10. The differences in results can be explained based on the differences in geometry and boundary conditions between the two codes. Both codes showed nearly identical enhancement factors in release rates of uranium-series nuclides (U-238, U-234, Th-230, Ra-226) arising from the effect of decay-chain in-growth. Calculated enhancement factors in release rates for precipitation of a new uranium-bearing solid within the waste package were also in good agreement between AREST and SVM.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 127: Symposium BERLIN – Scientific Basis for Nuclear Waste Management XII , 1988 , 597
Copyright
Copyright © Materials Research Society 1989

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References

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