Research on Atmospheric Steam Dump System Control Commands Oscillations and Valve Failure of CPR1000 Nuclear Units
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摘要: 针对CPR1000核电机组蒸汽对空旁路排放系统(GCT-a)出现的控制指令振荡和阀门失效问题,对GCT-a控制回路的比例积分控制器参数进行优化。利用阀门诊断仪(Flow-scanner 6000)对阀门参数进行测试,结合工艺系统运行数据,指出阀门失效根本原因是阀门的阀笼在流量设计上存在问题,导致系统在运行时阀门控制指令出现振荡,致使阀门的密封面加速受损,并提出该问题的解决办法。Abstract: For CPR1000 nuclear units atmospheric steam dump system(GCT-a), one event happened was mainly caused by the sustained oscillation of the valve control command which led to the valve malfunction eventually. By optimizing the PID parameter of control loop and testing the valve parameters with Flow- scanner 6000, and also considering the operation data, it is demonstrated that the valve failure is caused by the design defect on the cage contributing to the control command oscillation and damage on sealing surface, and the resolution is proposed.
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Key words:
- Bypass system /
- Commands oscillations /
- Parameters optimized /
- Cage
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