The Hashimoto-Koshiishi model was simplified from a mathematical viewpoint taking into consideration explicit crack growth rate (CGR) dependency on the stress intensity factor to enable practicable use of the model in the integrity assessment of boiling water reactor components. Then simplified equations were developed for different strain distribution cases in the model. The developed simplified equations were applied to analyze CGRs of cold worked stainless steels and the simulated weld heat affected zone of the primary loop recirculation piping and core shroud and these equations reproduced CGRs well.

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