CPR1000机组电动主给水泵跳泵触发RB控制优化

Optimization of the Control for the Run Back Tripped by Motor-Driven Feed-Water Pump in CPR1000

改进型百万千瓦级压水堆(CPR1000)核电站机组在调试启动阶段,需要执行电动主给水泵单泵运行触发汽轮机快速甩负荷试验。试验主要目的是验证电动主给水泵在意外跳泵后,控制系统维持机组稳定运行的能力。由于试验过程中突然失去一台电动主给水泵供水,蒸汽发生器液位会发生剧烈变化;若出现"蒸汽发生器液位低+汽/水流量不匹配"信号或"蒸汽发生器液位低低"信号,则触发反应堆跳堆保护。采用优化控制逻辑的方法,提升了电动主给水泵单泵运行工况下给水控制系统的性能。试验结果表明:优化控制逻辑可在甩负荷工况触发后,迅速提升主给水流量,减小机组跳堆风险;同时,提高了执行试验时的功率,使后续机组均可在该功率平台进行电动主给水泵单泵检修,有效提升了机组的经济效益。

In commissioning and startup stages of the improved pressurized water reactor （ PWR） nuclear power unit （CPR1000） ,the run back test tripped by single motor-driven feed-water pump operation is necessary to be executed. The main purpose of the test is to verify the capability of control system to maintain the stable state operation of unit when one of the motor- driven feed-water pumps accidentally trips. Due to the sudden loss of a motor-driven feed-water pump during the test,the water level of steam generator will change dramatically; if the steam generator level low steam/water flow mismatch signal or the low level of steam generator signal appears, the reactor trip protection would be tripped. By optimizing the control logic, the performance of the feed water control system under the condition of single motor-driven feed-water pump operation can be enhanced. The experimental results show that when run back to be tripped, the optimal control logic can be used to quickly increase the main feed water flow rate, reduce the risk of reactor trip. In addition, due to the increase of the test power platform, the single pump maintenance of the follow-up units can be carried out on this power platform, thus the economic benefit of the unit is effectively improved.