压水堆棒控系统动力熔断器烧毁原因分析及维修策略改进

Cause Analysis of Power Fuse Burned in Pressurized Water Reactor Control Rod System and Improvement of Maintenance Strategy

对某核电厂反应堆棒控系统动力熔断器烧毁事件进行根本原因分析。通过对反应堆棒控系统原理和熔断器所在电路的分析,结合熔断器熔断特性和可控硅导通与关断特性,实测数据验证动力熔断器烧毁根本原因是可控硅性能异常导致相邻两相电压短路,相间短路造成两相动力熔断器瞬间熔断。并给出反应堆棒控系统维修策略改进建议。

For a nuclear power plant reactor control rod system power fuse burned event root cause analysis. Through the analysis of system principle for the reactor control rod system and the power cabinet circuit, combined with fuses fusing characteristics and thyristor turn on and off characteristics, the actual measurement data shows that the root cause of fuse burned is the thyristor performance abnormal, abnormal performance of thyristor cause a short circuit between two adjacent phase voltage, resulting in fuses instantly burned. And gives the maintenance strategy recommendations for improvement the reactor control rod system.