AP1000核电站额定功率运行时单台给水泵跳闸瞬态分析

AP1000核电站额定功率运行时采用3台33.3%容量电动泵提供给水，无备用泵。通过对100%和70%额定功率平台下给水流量和蒸汽流量的稳态平衡计算，验证了1台泵跳闸后，剩余2台泵能维持电厂70%额定功率运行；并通过对CENTS程序建立的单台给水泵跳闸瞬态的仿真结果数据进行分析，验证了此瞬态下无需快速降功率动作，反应堆功率自动控制系统与蒸汽旁排系统能够将一回路平均温度维持在允许范围内，期间不会发生蒸汽发生器窄量程液位低跳堆事故，上述分析结果对 AP1000核电站调试和运行具有重要参考意义。

Transient Analysis of Single Feedwater Pump Trip in AP1000 Nuclear Power Plant Rated Power Operation

The AP1000 nuclear power plant adopts three electric pumps of 33.3% capacity with no standby pumps to provide feedwater during rated power operating. Through the stable feedwater and steam flows equilibrium calculation under 100% and 70% rated power conditions, it is verified that in case of one pump trip, the remaining two pumps can maintain power plant operation at 70% rated power. Based on the analysis on the simulation results of single feedwater pump trip transient condition established in CENTS program it is verified that there are no needs for rapid power reduction under this transient condition. The reactor power automatic control and the steam bypass systems can manage to maintain the average temperature of the primary loop within the allowable range while the steam generator water level does not drop to the low-low water level which would cause reactor shutdown. These results are critical to AP1000 nuclear power plant commissioning and operation.