Analysis on Spurious Turbine Runback of the Unit 2 at Qinshan Ⅱ NPP
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摘要: 描述了秦山第二核电厂2号机组因反应堆冷却剂低选平均温度误信号引起汽轮发电机组快速降负荷的瞬态工况,给出了瞬态过程中主要参数的变化情况,分析了机组控制系统的响应(尤其是棒控系统、蒸汽向冷凝器排放控制系统的动作)情况。分析结果表明,由于棒控系统和蒸汽向冷凝器排放控制系统的输入信号采用高选平均温度,因此,在瞬态过程中,两个控制系统能根据平均温度与参考温度的温差值协调运行,同时,蒸汽发生器水位、稳压器水位与压力等其它主要控制系统响应正确、及时,最终将机组稳定在较低的功率状态下。Abstract: This paper described the turbine runback transient resulted by spurious signal of low-selected reactor coolant average temperature,which happened at Unit 2 of Qinshan Ⅱ NPP.Changes of key parameter during the transient were provided,and responds of the unit control systems(especially Rod Control System and Steam Bypass Dumping System) were analyzed.Since high-selected reactor coolant average temperature was adopted as the input variable for Rod Control System and Steam Bypass Dumping System,during the overall transient,the control systems could cooperate well according to the difference value between average temperature and reference temperature,meanwhile the other main control systems such as the steam generator level,the pressurizer level and pressure could respond correctly and timely,finally the unit was stabilized at lower power state.The data from the transient will be used as a base for the plant modification.
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Key words:
- NPP reactor /
- Control systems /
- Turbine /
- Runback /
- Transient
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