Fire protection water system flushing for Nuclear Power Plant（NPP） was introduced in this paper. FPS pipe flushing work preparation

planning

cleaning control

human error prevention

water leaking prevention and controlled water flow direction were emphasized. Flushing as the pipes configuration in the area and water flow direction in system method were introduced. Method using compressed air to blow down the dry pipe was proposed

and FPS system flushing work was well finished. This paper is expected to provide references for nuclear power fire protection water system flushing.