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The Use of Repassivation Potential in Predicting The Performance of High-Level Nuclear Waste Container Materials

Published online by Cambridge University Press:  15 February 2011

Narasi Sridhar ,
Darrell Dunn  and
Gustavo Cragnolino
Narasi Sridhar
Affiliation:
Center for Nuclear Waste Regulatory Analyses (CNWRA) 6220 Culebra Road, San Antonio, Texas, U.S.A.
Darrell Dunn
Affiliation:
Center for Nuclear Waste Regulatory Analyses (CNWRA) 6220 Culebra Road, San Antonio, Texas, U.S.A.
Gustavo Cragnolino
Affiliation:
Center for Nuclear Waste Regulatory Analyses (CNWRA) 6220 Culebra Road, San Antonio, Texas, U.S.A.
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Abstract

Localized corrosion in aqueous environments forms an important bounding condition for the performance assessment of high-level waste (HLW) container materials. A predictive methodology using repassivation potential is examined in this paper. It is shown, based on long-term (continuing for over 11 months) testing of alloy 825, that repassivation potential of deep pits or crevices is a conservative and robust parameter for the prediction of localized corrosion. In contrast, initiation potentials measured by short-term tests are non-conservative and highly sensitive to several surface and environmental factors. Corrosion data from various field tests and plant equipment performance are analyzed in terms of the applicability of repassivation potential. The applicability of repassivation potential for predicting the occurrence of stress corrosion cracking (SCC) and intergranular corrosion in chloride containing environments is also examined.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 353: Symposium – Scientific Basis for Nuclear Waste Management XVIII , 1994 , 663
Copyright
Copyright © Materials Research Society 1995

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References

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