抄録
Current fatigue evaluation in PWR environment is determined by JSME S NF1 in which some parameters (temperature, strain rate, dissolved oxygen, etc.) are evaluated as an influencing factor. However, it is assumed that JSME Code would be conservative in high strain rate region because environmental factor (F_<en>) is evaluated by extrapolating experimental test results in low strain (up to 0.4%/sec). In this study, we obtained the experimental data and reevaluated F_<en> for high strain rate region. As a result, we confirmed that F_<en>, in 1.0%/sec strain rate was about one half of that in JSME Code. Further, marshaled experimental data got from EFT project dividing them to each stainless grade and charge, strain rate for F_<en>=1 could be lower than 3%/sec for all austenitic stainless steel and similar to current test result.
