Lifetime analysis of divertor structure with two-dimensional first-wall lifetime analysis code: CALIF

CALIF has been developed for behavior and lifetime analysis of plasma interactive components. CALIF has the following features. (1) The systematic and consistent behavior analysis. (2) Analysis by finite element method in a two-dimensional geometry. (3) Analysis in both long and short duration time. (4) Lifetime evaluation from the aspects of material damage, erosion thickness, stress, fatigue and CDF (Cumulative damage factor). The following conclusions are obtained in the analysis on divertor. (1) Long term analysis shows that temperature distribution gives high stress, due to spatial difference of swelling strain. This stress provides a significant influence on the divertor lifetime. In copper-alloy divertor, this effect is remarkable, even at low temperature and low neutron fluence. (2) Analysis with surface erosion shows that a moderate erosion rate makes divertor lifetime much longer. (orig.)