Sensitivity analysis of failure probability on PTS benchmark problems of pressure vessel using a probabilistic fracture mechanics analysis code

In this paper, the results of the sensitivity analyses of failure probabili ty are presented for pressure vessel under PTS (Pressurized Thermal Shock) transient, by using our new probabilistic fracture mechanics analysis code. The pressure, the fluid temperature at the inner surface of pressure vesse l and other analysis conditions are based on an international benchmark stu dy on PTS. The temperature and stress distributions through wall thickness during transient are obtained by a heat transfer and an elasto-plastic stre ss analysis with FEM. The new models and methodologies introduced in our co de are summarized and the effect of overlay clad and behavior of semi-ellip tical crack on the failure probability are investigated especially.