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棒控和棒位系统RGL(Rod Position Indication and Rod Control System)是核电机组最重要的控制系统之一,其性能好坏直接关系到电站的可用性。
RGL系统在核电机组启堆、功率变化和停堆过程中,通过控制棒驱动机构CRDM(Control Rod Drive Mechanisms)来提升、插入和保持反应堆控制棒,并对每一束控制棒在堆芯的实时位置进行监视,从而控制反应堆的反应性,保证反应堆始终处于安全状态[1-3]。
RGL系统是一个很复杂的系统,从国内外核电机组运行经验来看也出现过各种各样的故障模式[4-6]。当该系统出现双夹持故障(double-hold fault)时会将整个控制棒组闭锁,且故障棒束及故障原因无法在主控室查看,需要运行人员现场对机柜进行确认。该故障发生在机组进行瞬态工况运行时,可能会导致反应堆停堆。本文结合国内某CPR1000核电机组的双夹持故障经验反馈,对故障原因进行了深入分析与研究。
Analysis of Double-Hold Fault in RGL System of CPR1000 Unit
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摘要:
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。 Abstract: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. -
Key words:
- RGL /
- nuclear power unit /
- CPR1000 /
- double-hold fault /
- experience feedback /
- software defect
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