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Stress Corrosion Cracking of Alloy 800 in Secondary Side Crevice Environment

  • Maria-Lynn KomarEmail author
  • Guylaine Goszczynski
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Alloy 800 nuclear grade (NG) is a material of choice for replacement steam generators (SG) due to its inherent resistance to primary water stress corrosion cracking (SCC). However, the long term performance of SGs depends on the performance of the material in upset conditions. Various degradation modes have been observed in Alloy 800NG under simulated secondary crevice environments (SCE) in C-ring and CERT experiments. Furthermore, the first incidences of SCE SCC have been observed in Alloy 800NG SG tubes in nuclear power plants and may be the sentinel events at the onset of more extensive cracking in the future. Understanding the parametric dependencies of SCC obtained under representative SCE and plausible transient conditions are keys to predicting future SG performance, validating mitigation strategies, and addressing life extension issues. The results of SCE crack growth rate (CGR) testing of Alloy 800NG in conditions representative of an acid-sulfate chemistry upset condition will be presented.

Keywords

Alloy 800 Stress corrosion cracking Initiation Growth rate Acidic crevice environment 

Notes

Acknowledgements

The authors gratefully acknowledge Peter Andresen of GE R&D for his expert advice on CGR testing, and Sandy MacKay of Ontario Power Generation for performing the MULTEQ calculations of the standard and modified crevice chemistry pH.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.Kinectrics Inc.Toronto, OntarioCanada

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