Host: The Japan Society of Mechanical Engineers
Name : The 30th International Conference on Nuclear Engineering (ICONE30)
Date : May 21, 2023 - May 26, 2023
In order to realize the retention of core melt, some nuclear power plant has set up a Cavity Injection and Cooling System. The system includes two parts, active injection and passive injection, of which the passive part adopts high-level water source injection to meet the flow demand, and the active injection part is supplied by the fire pump, and a flow control valve is set on the cooling water supply pipeline. After the serious accident of core melting, the pressure in the containment has a large range of change, and the flow control valve is used to adjust the flow of cooling water injected into the pit, and then take away the core melt heat through the external cooling of the pressure vessel, reduce its temperature, and maintain the integrity of the pressure vessel. Finally, the retention of the core melt in the pressure vessel is realized. Among them, the active injection part, according to the accident analysis, is divided into the initial stage of large-flow injection, and when the reactor cavity is filled with water, it enters the long-term low-flow water injection stage, which meets water-supply need for a certain period of time. By using commercial software “FLOWMASTER” to model the water injection cooling system of some nuclear power reactor cavity, based on different pressure in the containment vessel and the injection flow demand at different stages, the calculation, analysis and research are carried out. The operating point of the control valve suitable for some nuclear power plant was determined.
