关键词: 核电站, 重要厂用水系统, 两阶段关阀, 水锤, PIPENET, 泵站

Abstract: The essential service water system of a nuclear power plant is the DC water heat transport system from the auxiliaries cooling water system to the sea, whose long-term safe and stable operation must be ensured. The pump-stop water hammer of the essential service water system of a nuclear power plant is simulated with transient calculation function of PIPENET software for system design and optimization. The issues of liquid column separation, outlet pressure and pump backflow are analyzed for the check valve downstream from the pump through the simulation. An optimized scheme of shutdown durations of 4 s and 7 s for the quick and the slow stages respectively is obtained through the scheme comparison. The simulation results show that the scheme can not only significantly reduce the reverse rotation of pump, but also ensure the water hammer pressure lower than the designed value.

Key words: nuclear power station, essential service water system, two-stage valve shutdown, water hammer, PIPENET, pump station