国内三环路压水堆核电机组在功率运行时,曾发生单一环路流量超差事件。通过对故障机理和故障模式的排查分析,结合国内外同类机组的实际案例,认为单一环路流量超差问题是由测量误差相关因素导致的,可通过停堆大修后的试验和测量数据进行故障排查确认。 During the operation of power plants in China’s Third Ring Road PWR nuclear power station, a single loop flow overrun event occurred. Through the investigation and analysis of fault mechanism and fault mode, combined with the actual cases of similar units at home and abroad, it is considered that the single loop flow rate tolerance problem is caused by the measurement error related factors, which can be verified by the test and measurement data after the shutdown and overhaul Check confirmed.