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Evaluation of Corrosion Processes Affecting the Performance of Alloy 22 as a Proposed Waste Package Material

Published online by Cambridge University Press:  01 February 2011

Gustavo A. Cragnolino ,
Darrell S. Dunn  and
Yi-Ming Pan
Gustavo A. Cragnolino
Affiliation:
Center for Nuclear Waste Regulatory Analyses (CNWRA), Southwest Research Institute, San Antonio, TX 78238–5166, U.S.A.
Darrell S. Dunn
Affiliation:
Center for Nuclear Waste Regulatory Analyses (CNWRA), Southwest Research Institute, San Antonio, TX 78238–5166, U.S.A.
Yi-Ming Pan
Affiliation:
Center for Nuclear Waste Regulatory Analyses (CNWRA), Southwest Research Institute, San Antonio, TX 78238–5166, U.S.A.
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Abstract

This paper presents recent work on evaluating localized corrosion and stress corrosion cracking, two corrosion processes that are important to the long-term performance of Alloy 22 (58Ni-22Cr-13Mo-3W-4Fe). This alloy is the material preferred by the U.S. Department of Energy (DOE) for the outer container of the waste package to be used in the proposed high-level radioactive waste repository at Yucca Mountain, Nevada. It was found that both welded and thermally aged materials are more susceptible to localized corrosion in chloride solutions at temperatures above 60 EC than the mill-annealed material. This observation suggests that welding and certain post-welding operations may decrease the estimated life of the waste packages. However, no stress corrosion crack growth was observed in concentrated chloride solutions and simulated, concentrated groundwater at 95 EC when precracked compact tension specimens were tested under both constant and cycling loading.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 807: Symposium Scientific Basis for Nuclear Waste Management XXVII , 2003 , 435
Copyright
Copyright © Materials Research Society 2004

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References

REFERENCES

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