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Effect of Chloride Transients on Crack Growth Rates in Low Alloy Steels in BWR Environments

  • Xiaoyuan LouEmail author
  • Raj Pathania
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

The objective of this study was to quantify the effect of chloride transients on stress corrosion cracking of pressure vessel low alloy steels. Two heats of reactor pressure vessel steel were evaluated at various chloride concentrations in both NWC and HWC environments. The tests showed that low alloy steels can exhibit a delayed cracking response during a chloride transient. The delayed response is attributed to the concentrating and dilution processes of anionic impurities inside the crack. The crack can maintain its original growth rate for a certain period after the chemistry change. The effects of chloride concentration, stress intensity factor (K) and periodic load cycling on the crack incubation and growth in low alloy steel will be discussed. The results from this work will provide a direct input to development of a crack growth model for low alloy steels, water chemistry guidelines and effects of chloride transients on crack growth.

Keywords

Pressure vessel low alloy steel Stress corrosion cracking Chloride Boiling water reactor Crack growth Memory effect 

Notes

Acknowledgements

This research is sponsored by Boiling Water Reactor Vessel and Internals Program, Electric Power Research Institute. Authors thank Dr. Peter Andresen for many helpful discussion.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.GE Global Research, One Research CircleNiskayunaUSA
  2. 2.Electric Power Research InstitutePalo AltoUSA

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