Water hammer in the circulating pipe line with pressure vessels

Studies have been made to compare and discuss the analytical solutions solved by the method of characteristics with the experimental results on the water hammer. The measurements have been carried out using the 1/6 scale model of the primary coolant system of the experimental fast breeder reactor ''JOYO'' belonging to Power Reactor and Nuclear Fuel Development Corporation. The water hammer has been taken place, at the flow velocity 0.5 and 1.0 m/sec, with closing slowly the flow control clap valve in the time ranges 4.5 -- 9.6 seconds and 4.6 -- 11.2 seconds respectively. Qualitative agreement was found between the analytical and experimental results. And the calculation gave the safety value at the peak pressure. Therefore the calculation models and idea used in this paper have sufficient practical value. (author)