| Title |
Statistical Evaluation of Factors Affecting IASCC of Austenitic Stainless Steels for PWR Core Internals |
| Authors |
김성우(Sung Woo Kim); 황성식(Seong Sik Hwang); 김홍표(Hong Pyo Kim) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
accelerated Life testing model; austenitic stainless steels; Cr depletion; irradiation-assisted stress corrosion cracking; IASCC; statistical approach; stress |
| Abstract |
This work is concerned with a statistical analysis of factors affecting the irradiation-assisted stress corrosion cracking (IASCC) of austenitic stainless steels for core internals of pressurized water reactors (PWR). The microstructural and environmental factors were reviewed and critically evaluated by the statistical analysis. The Cr depletion at grain boundary was determined to have no significant correlation with the IASCC susceptibility. The threshold irradiation fluence of IASCC in a PWR was statistically calculated to decrease from 5.799 to 1.914 DPA with increase of temperature from 320 to 340℃. From the analysis of the relationship between applied stress and time-to-failure of stainless steel components based on an accelerated life testing model, it was found that B2 life of a baffle former bolt exposed to neutron fluence of 20 and 75 DPA was at least 2.5 and 0.4 year, respectively, within 95% confidence interval. |