蒸汽发生器泄漏率监测仪修复经验总结

Maintenance experience for steam generator leak rate monitor

目前压水堆核电站使用辐射监测仪对主蒸汽管道中的N-16核素浓度进行连续监测,由于蒸汽发生器泄漏监测仪长期工作在高温高湿环境下,普遍存在故障率偏高的问题,影响到了核电站相关系统的正常运行。从6台SGLM201型蒸汽发生器泄漏率监测仪的故障诊断、故障原因分析、修复技术研究等方面入手,分析了总γ计数异常闪发故障、稳峰异常故障、N-16道计数报警、贴片器件腐蚀等故障原因,并针对每项故障提出了技术维修方案和整机湿热防护加固技术方案。经过环境试验、校准测试等验证,证明提出的技术维修方案可行,能够有效降低该设备的故障率,提高其长期运行可靠性。

Radiation monitor is used in PWR nuclear power plant to monitor the concentration of N-16 radionuclide in the main steam pipe,and then to calculate the damage rate of steam generator.Because the steam generator leakage monitor works in high temperature and humidity environment for a long time,the failure rate of the monitor is high,which may affect the normal operation of the nuclear power plant.In this paper,the fault diagnosis,fault cause analysis and repair technology research of six SGLM201 steam generator leakage rate monitors are completed,and the technical maintenance scheme and the whole machine damp heat protection and reinforcement technical scheme are put forward for each fault.After repair,the monitor is verified by environmental test and calibration test,which proves that the technical maintenance scheme proposed in this paper is feasible,which can effectively reduce the failure rate of the equipment and improve its long-term operation reliability.