Probabilistic Nonlinear Analysis of the NPP Hermetic Cover Failure due to Extreme Pressure and Temperature

This paper describes the probabilistic nonlinear analysis of the reactor cover under a high internal overpressure and temperature. The scenario of the hard accident in NPP and the methodology of the calculation of the fragility curve of the failure overpressure using the probabilistic safety assessment PSA 2 level is presented. The model and resistance uncertainties were taken into account in the response surface method (RSM).