核电厂通风系统电机轴断裂根本原因分析

Root Cause Analysis of Ventilation System Motor Shaft Fracture in Nuclear Power Plants

本文针对岭澳核电站通风系统电机轴断裂事件,从电机轴可能断裂的故障模式出发,综合运用金相分析、电镜扫描、光谱元素测定、力学计算分析等方法,结合现场维修改造及实验测试反馈,逐一对轴断裂可能原因进行了分析论证和逻辑推理,最终找出了轴断裂的根本原因与促成因素,同时从电机维修管理和控制调节方面提出了有效的改进措施。

The motor shaft rupture incident of Ling＇ao nuclear power plant was analyzed by the international popular technique of root cause analysis. Firstly, all the probable failure modes of the motor rupture cause were analyzed with the efficient analytical techniques of Metallographic, Scanning Electron Microscope, Spectral Element Analysis, Stress Analysis and the Feedback of the Maintenance and Vibration test. And then the non-related failure modes were rejected, and the root cause and the contributor cause of the motor rupture were evidenced. Finally, the efficient maintenance and management advice are given to ensure the similar motor in a safe and reliable condition.