某CPR1000+型核电机组在执行试验期间,KIR(松动部件和振动监测系统)出现报警,经分析认为一回路存在异物,为保证机组安全,机组停运下行,历时4个月完成异物查找及设备修复。文章着眼于一回路及其辅助管线、设备的结构特征,提出较为全面的异物查找分析方法和预防措施,确保整个系统内部完整地实现异物查找及清除,促使机组重新启动。 KIR (loose parts and vibration monitoring system) alarm occurred during the execution of a test of a CPR1000 + nuclear power plant. After analysis, it is considered that there is a foreign body in the primary circuit. To ensure the safety of the unit, the unit stopped down and took 4 months to complete the foreign matter search and equipment repair . This paper focuses on the structural features of the primary circuit and its auxiliary pipelines and equipment and proposes a more comprehensive method of finding and analyzing foreign bodies to ensure that the entire system can be completely located to find and remove foreign matter and to restart the unit.