Abstract
One of the main concerns of the nuclear industry is to safely operate power plants beyond their original design lives. In this context, understanding of aging mechanisms and accurate integrity assessment by taking into account relevant uncertainties become important. The objective of this research is to examine effects of environmentally assisted fatigue and stress corrosion cracking on nuclear piping integrity. With regard to the aging, small and big leak probabilities are calculated in a reactor coolant system of nuclear power plant. Moreover, sensitivity analysis is also performed to find out the effect of parameters for the leakage of pipes. Effects of the fatigue, SCC and key findings with the details of analysis results will be fully discussed. As a result, fatigue has a dominant effect on the pipe leakage probability and effect of temperature was higher than that of heat-up/coolant frequency and oxygen concentration.
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