A probabilistic integrity assessment program for pipes is developed based on the existing PRAISE program. In the program crack growth due to fatigue loading and stress corrosion can be considered and the probability of failure or leakage of pipes in nuclear power plants can be calculated. Crack growth simulation is performed based on stress intensity factors and failure of a pipe is determined based on J integral or net section yielding. The effects of several important parameters, such as crack depth distribution parameter, operating temperature, and concentration of O2, on the failure and leak probabilities of pipes are examined. And the effects of stress intensity factor and J integral solutions are also examined. It is noted that the failure probability can be changed according to stress intensity factor and J integral solutions.

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