Code-B-2 for stress calculation for SiC-TRISO fuel particle

Aihara, Jun ; Ohashi, Hirofumi ; Sawa, Kazuhiro; Tachibana, Yukio 

We have developed Code-B-2 for the prediction of pressure vessel failure probabilities of SiC-tri-isotropic (TRISO) coated fuel particles for the high temperature gas-cooled reactors (HTGRs) under operation by modification of an existing code, Code-B-1. We have modified internal pressure calculation part of Code-B-1 to treat fluctuation of irradiation temperature for Code-B-2. In addition, we have added part of calculation of irradiation creep constants and irradiation swelling rates of PyC layers, which are very important for stress calculation. In this report, we first describe on details of Code-B-2. Next, we calculate a property of PyC (Bacon anisotropic factor (BAF) value) for Code-B-2, which is used for calculation of failure probabilities of Japanese high-quality SiC-TRISO fuel particles under operation with a method we have suggested.