核电厂主蒸汽隔离阀是负责将蒸汽生产系统和蒸汽使用系统分隔开的阀门,其承担的核安全功能是在主蒸汽管道大破口或给水管道破裂的事故工况下,主蒸汽隔离阀快速关闭,限制事故后果。在原设计中,设置了主蒸汽隔离阀高压差开启联锁回路的检查试验,用于验证机组启动期间主蒸汽隔离阀前后压差高时闭锁该阀门的开启,避免该隔离阀误开启引起蒸汽发生器和一回路参数波动。 The main steam isolation valve of a nuclear power plant is a valve that is responsible for separating the steam production system from the steam utilization system. The nuclear safety function it undertakes is that under an accident condition where the main steam pipe breach or the water supply pipe rupture, the main steam isolation valve Close, limit the consequences of the accident. In the original design, the main steam isolation valve is set to open the high-pressure differential interlock test circuit to verify when the main steam isolation valve before and after the unit when the pressure difference is high, the valve is closed to open the valve to prevent the misoperation caused by the steam valve Fluctuations in the parameters of the primary and secondary circuits.