Abstract
In this study, we investigate the influence two or more flaws have on the collapse intensity of austenitic stainless steel piping, and improve the safety of a nuclear power plant. The multiple flaws can be more often than single flaw. Therefore, it is important to evaluate the collapse strength of the piping with the multiple flaws. Piping with a single flaw and two or more flaws are used in the examination. Collapse strength of piping is evaluated under the load condition of tension and bending. It aims to model from two or more flaws to the single flaw from verification of the collapse strength of a single flaw and two or more flaws. As a result, 1) It is possible to evaluate collapse strength conservatively by identifying the multiple flaws as the single flaw. 2) On each load condition, the parallel notches on piping can be accounted to be the single notch.
