CPR1000机组RGL系统双夹持故障分析

  目的  棒位和棒控系统RGL（Rod Position Indication and Rod Control System）是核电机组重要的控制系统之一，其性能好坏直接关系到核电机组的可用性。当该系统出现双夹持故障时会将整个控制棒组闭锁，在机组进行瞬态试验、升降负荷或甩负荷期间控制棒组不能及时动作，可能导致反应堆停堆。  方法  结合某CPR1000核电机组出现的RGL系统双夹持故障经验反馈案例，从设计原理的角度对双夹持故障出现的原因进行了分析研究。  结果  分析结果指出控制器软件中的时刻控制器误判MG机架状态，从而输出错误信号导致了双夹持故障触发。  结论  软件缺陷是造成RGL系统双夹持故障的重要因素。

Analysis of Double-Hold Fault in RGL System of CPR1000 Unit

  Introduction  The RGL system (Rod Position Indication and Rod Control System) is one of the important control systems in nuclear power unit, its performance is directly related to the availability of nuclear power unit when the double-hold fault happen in the RGL system, the entire control rod group will be locked, and the control rods cannot move in time during the transient test, load reducing operation or load raising operation of the unit, which may lead to the shut down of the reactor.   Method  Based on the experience feedback of the double-hold fault of the RGL system in a CPR1000 unit, this paper analyzed and researched the cause of the double-hold fault from the perspective of design principles.   Result  The analysis results indicate that the moment controller in the controller software misjudges the state of the MG rack, and thus outputs the wrong signal, which leads to the triggering of the double-hold fault.   Conclusion  Software defect is an important factor causing double hold fault of RGL system.