延性き裂進展解析法を導入したPFMコード開発

概要

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In order to improve the accuracy and reliability of failure probability in PFM analyses, a PFM code PASCAL for evaluating the failure probability of an aged reactor pressure vessel has been developed. This code has a function to evaluate the effect of ductile crack extension, where the increase in fracture resistance by ductile crack extension is taken into account based on R6 method (Rev.3). Three fracture criteria were introduced including ductile crack extension analysis by R6 method analysis category 3. Using the NRC/EPRI PTS benchmark problem, the influences of fracture criterion were compared. Results of sample analysis showed the conditional fracture probability based on R6 method category 3 is much lower than that of K_<1c>/K_<1a> criterion. Especially, in low neutron fluence condition, the difference of fracture probability between R6 method Category 3 and K_<1c>-K_<1c> criterion even reaches 5 orders of magnitude.
社団法人日本機械学会の論文
2003-02-25