福清核电主给水泵勺管故障保位研究与工程实践  

Study and Engineering Practice on Spoon Tube Failure of the Main Feedwater Pump in Fuqing Nuclear Power Plant

作　　者：汤吉星 严亮 黄毓鑫 TANG Jixing;YAN Liang;HUANG Yuxin(Fujian Fuqing Nuclear POWER Co.Ltd,Fuqing of Fujian Prov.350300,China)

机构地区：[1]福建福清核电有限公司,福建福清350300

出　　处：《核科学与工程》2024年第2期367-376,共10页Nuclear Science and Engineering

摘　　要：目前国内在运M310核电机组主给水泵大多采用的是德国福伊特公司(Voith)生产的未带勺管保位功能的液力耦合转速控制系统,该控制系统在PLC控制电源失去、勺管位置传感器故障、勺管位置控制器(VEHS)故障等多种故障情况下,勺管无法保持在当前位置,将导致主给水泵转速大幅波动失去控制,进而导致蒸发器水位波动,严重情况下将引起机组甩负荷、跳机、跳堆等情况。本文以提高主给水泵稳定性和可靠性为出发点,通过分析主给水泵液力耦合器原理及控制方式,研究主给水泵增加勺管故障保位功能,提出了针对性的改造方案,同时对改造工程实施风险及控制要点进行分析,给出建议的应对措施。改造方案已在福清核电成功实施并实现了预期改造目标,对同类核电机组主给水泵增加勺管故障保位功能改造具有借鉴意义。At present,the main feedwater pump of the M310 nuclear power unit in operation in China mostly adopts the hydraulic coupling speed control system without the scoop tube retaining function produced by Voith,Germany.This control system can not maintain the scoop tube at the current position in the case of PLC control power loss,scoop tube position sensor failure,scoop tube position controller(VEHS)failure and other failures,which will lead to the loss of control of the main feedwater pump speed fluctuations.This will lead to the fluctuation of the evaporator water level,and in serious cases,it will cause unit load rejection,turbine trip,reactor trip,etc.Based on the improvement of the stability and reliability of the main feed pump,this paper analyzes the principle and the control mode of the hydraulic coupler of the main feed pump,studies the increase of the spoon tube fault protection function of the main feed pump,and puts forward a targeted transformation plan.At the same time,it analyzes the implementation risks and control points of the transformation project,and gives suggestions for countermeasures.The transformation scheme has been successfully implemented in Fuqing Nuclear Power Plant and achieved the expected transformation objectives,which is of reference significance for the transformation of the main feedwater pump of similar nuclear power units to add the spoon-tube positioning function.

关 键 词：主给水泵 勺管 故障保位 液力耦合器 

分 类 号：TL48[核科学技术—核技术及应用]