Development of CALIF: A code for lifetime analysis of first wall in arbitrary shapes

A computer code CALIF has been developed for the behavior and lifetime analysis of the first wall in two-dimensional arbitrary shapes. The erosion, temperature and stress analyses proceed step by step during its whole life, and are performed consistently with each other. CALIF has been employed for the lifetime analysis of the blanket first wall and divertor. Some typical results show that high stress is provoked due to the spatial difference of swelling strains, which is induced by temperature distribution. This has a significant influence on the estimation of the wall lifetime. On the other hand, the analysis with surface erosion shows that this stress decreases a great deal by the effect of erosion. According to results, a moderate erosion rate makes the wall lifetime longer. The material, thermal and structural behaviors are analyzed and the wall lifetime is evaluated by using CALIF on the first wall structure. This work is very useful for design study of the limiter, vacuum vessel, divertor and the blanket first wall