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Accounting for EBR-II Metallic Waste Form Degradation in TSPA

Published online by Cambridge University Press:  11 February 2011

W. L. Ebert ,
M. A. Lewis ,
T. L. Barber  and
S. G. Johnson
W. L. Ebert
Affiliation:
Argonne National Laboratory, 9700 S. Cass Ave., Argonne, IL 60439
M. A. Lewis
Affiliation:
Argonne National Laboratory, 9700 S. Cass Ave., Argonne, IL 60439
T. L. Barber
Affiliation:
Argonne National Laboratory-West, P.O. Box 2528, Idaho Falls, ID 83403
S. G. Johnson
Affiliation:
Argonne National Laboratory-West, P.O. Box 2528, Idaho Falls, ID 83403
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Abstract

A metallic waste form (MWF) will be used to immobilize cladding hulls from spent sodium-bonded nuclear fuel rods. Laboratory tests were conducted to determine if the HLW glass degradation rate model used in Total System Performance Assessment (TSPA) calculations can be used as an upper bound for the degradation rate of the MWF. Static tests were conducted with monolithic MWF samples in pH buffer solutions to measure the degradation rates at 50, 70, and 90°C. The measured degradation rates of the MWF were compared to the rates calculated with the HLW glass degradation model. The degradation rates were calculated as the product of the specific dissolution rates and the anticipated exposed surface areas of glass and MWF in a breeched canister. This comparison showed that the rate calculated using the HLW glass degradation model bounds the rates measured for the MWF at all pH values and temperatures. These results support the potential use of HLW glass as a surrogate for MWF degradation for the purpose of performance assessment.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 757: Symposium II – Scientific Basis for Nuclear Waste Management XXVI , 2002 , II4.7
Copyright
Copyright © Materials Research Society 2003

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References

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