Abstract
Since several safety related systems were added to the plants through the process of the new regulatory requirements, the numbers of components to be inspected, which is already a large amount, will increase even more after the restart. Effective measure will be required to command maintenance activities by reasonably assigning limited resource. The authors have planned a research project aiming optimization of maintenance considering influence of fluid leakage behavior with pipe failure, mainly targeting less-safety related piping and components. The experimental equipment which has the ability to evaluate the fluid leakage behavior with pipe failure was constructed. By using this equipment, it is able to conduct the mock test of the flushing and the steam flow leaked from various flaw geometries of the piping (crack, pinhole and guillotine break).
