一、引言核电站保护系统的职能,是当电站的核参量或过程参量发生异常变化或运行人员误操作时,能根据对异常状态的监测和异常变化的危害程度,执行保护动作,防止堆芯燃料烧毀及过量放射性物质扩散,确保电站和周围居民的安全。当反应堆出现异常,但还不致于马上危及反应堆安全时,为确保电站连续运行,可发出报警信号或由闭锁系统提供校正措施:停棒(起动时)或反插降功率运行,使反应堆恢复正常运行状态;当运 I. INTRODUCTION The function of a nuclear power station protection system is to perform a protection action against the nuclear fuel or nuclear fuel according to the monitoring of the abnormal state and the degree of damage caused by the abnormal change when the nuclear parameters or process parameters of the power station change abnormally or the operation personnel misoperate Burning and the proliferation of excessive radioactive substances to ensure the safety of power plants and surrounding residents. When the reactor is abnormal but not immediately endangering the safety of the reactor, to ensure continuous operation of the plant, a warning signal may be issued or a corrective action may be provided by the lockout system: stop the reactor (start-up) or back-plug power operation to restore the reactor to normal Operating status; when shipped