M310核电机组上充泵出口联通阀故障控制策略改进研究

Research on Improvement of Control Strategy for Fault of Charging Pump Outlet Connection Valve in M310 Nuclear Power Unit

M310核电机组在上充泵出口联通阀RCV083VP或RCV084VP故障关闭且无法开启时,需将上充下泄管线隔离并投运过剩下泄管线,启动RCV001PO保持主泵轴封冷却水供应。此种控制策略结果:产生上充和下泄不可用事件,即产生两个同一系统的I01(RCV3、RCV4);产生至少一个参与高压安注直接注入功能的阀门不可用事件,即产生另一系统I01(RIS3)。不同系统两个I01叠加,根据技术规范要求机组1 h内开始向MCS模式后撤。通过查询设计文件、上充泵出厂前试验、系统计算分析得出结论,RCV083VP或RCV084VP故障关闭且无法开启的情况下可启动第二台上充泵长期运行,保证主泵轴封冷却水和上充流量,避免机组因技术规范要求短时间内进行后撤。

When the connecting valve RCV083VP or RCV084VP at the outlet of the charging pump of the M310 nuclear power unit fails to close and cannot be opened,the charging and discharging pipelines need to be isolated and excess discharging pipelines need to be put into operation.RCV001PO should be started to maintain the supply of cooling water for the main pump shaft seal.The result of this control strategy is the generation of unavailable charging and discharging events,that is,the generation of two I01(RCV3,RCV4)of the same system;At least one valve that is involved in the direct injection function of high-pressure safety injection is unavailable,another system I01(RIS3)is generated.Two different I01 systems are stacked,and according to technical specifications,the unit starts to retreat to MCS mode within 1 hour.This article concludes through consulting design documents,pre factory testing of the charging pump,and system calculation analysis that if RCV083VP or RCV084VP fails to close and cannot be opened,the second charging pump can be started for long-term operation to ensure the cooling water and charging flow rate of the main pump shaft seal,and to avoid the unit from being withdrawn in a short period of time due to technical specifications requirements.