Probabilistic risk assessment for the piping of a nuclear power plant: Uncertainty and sensitivity analysis by using SINTAP procedure

For the purpose of probabilistic fracture mechanics estimation in field reliability analysis pressure vessels and piping, a method by using SINTAP (Structural INTegrity Assessment Procedures for European Industry) is developed. Monte Carlo simulation (MCS) applied to investigate influence both uncertainties random parameters inspection strategies on failure probability (FP). A sensitivity with regard above-mentioned aspects conducted identify most significant efficient countermeasures reduce risk specially-assumed cases. The results this study point out that thickness inner radius pipe have strongest impact FP pipe, followed bending moment, weld residual stress (WRS), crack length, initial depth, yield strength (YS), ultimate tensile (UTS), flow strength, toughness, axial force. Compared detection quality start time, selecting an appropriate interval more effective risk. All these provide reference design piping systems guide selection in-service (ISI) suitable flaw-detection capabilities frequencies.