钠冷快堆一回路主循环泵在厂外主辅电源切换工况下的运行特性研究

Study on the Operation Characteristics of the Primary Main Circulating Pump of Sodium-cooled Fast Reactor under the Switching Condition of Off-site Main and Auxiliary Power Supplies

在厂外主辅电源切换时,为避免因一回路主循环泵(简称主泵)运行引起反应堆保护停堆或电机辅助绕组启动,对主泵惰转特性及转速控制进行分析,分别对快切和慢切工况下主泵的快速飞车启动和搜频飞车启动模式进行研究,给出了不同模式下主泵的最低转速预测模型,分析出了快切工况(断电1.5 s)下主泵最低转速为708.3 r/min,慢切工况(断电10 s)下最低转速为341.2 r/min。在主泵水台架上,用1.5 s和10 s断电试验来模拟厂外主辅电源快切和慢切工况,试验结果表明,快切工况下主泵最低转速为689 r/min;慢切工况下主泵最低转速为346.7 r/min。最低转速预测值与试验值吻合较好,偏差小于3%。试验验证了主泵在主辅电源切换工况下的运行特性,可实现快切不导致反应堆保护停堆,慢切不导致辅助绕组启动,对反应堆安全运行具有指导意义。

In order to avoid reactor protection shutdown or motor auxiliary winding startup due to the operation of primary main circulating pump(hereinafter referred to as main pump)during the off-site main and auxiliary power supplies switching,the idling characteristics and speed control of main pump are analyzed,the fast speed tracking and frequency search speed tracking modes of the main pump under fast and slow switching conditions are studied respectively,and the prediction model of the minimum speed of the main pump under different modes is given.It is analyzed that the minimum speed of main pump is 708.3 r/min under fast switching condition(power off for 1.5 s)and 341.2 r/min under slow switching condition(power off for 10 s).On the main pump water bench,1.5 s and 10 s power off tests are used to simulate the fast switching and slow switching conditions of the off-site main and auxiliary power supplies.The test results show that the minimum speed of main pump is 689 r/min under fast switching condition;The minimum speed of main pump under slow switching condition is 346.7 r/min.The predicted minimum speed is in good agreement with the test value,and the deviation is less than 3%.The test verifies the operation characteristics of the main pump under the switching condition of the main and auxiliary power supplies,which can realize that the fast switching does not lead to the reactor protection shutdown and the slow switching does not lead to the startup of the auxiliary winding,which is of guiding significance for the safe operation of the reactor.