核电站企业普遍配备有大量的钢制容器，容器筒体在补强圈、吊耳连接板、支撑垫板等位置均设置信号孔。容器服役期间，信号孔以监测容器是否发生泄漏的单一功能而存在，均未对其有过任何专业的在役检查。若干时间后，缺失检查的信号孔对应部位泄漏，容器安全运行受到威胁。就钢制容器（其他任何金属质容器均可）信号孔封堵问题进行分析和论述，首次研发一种新型的封堵装置可避免信号孔区域发生缝隙腐蚀，实际应用后有效提高了核电厂容器系统完整性、可靠性，有效保障了核安全。封堵装置不限于核电站和钢制范畴，对于其他行业、其他材质容器具有参考意义。

Nuclear power plant enterprises are generally equipped with a large number of steel containers. The container cylinder is equipped with signal holes at positions such as reinforcement rings, lifting lug connection plates, and support pads. After the container is in service, the signal hole exists only with the single function of monitoring whether the container leaks, and there has never been any professional in-service inspection for it. After a certain period of time, the corresponding part of the signal hole without inspection leaks, and the safe operation of the container is threatened. The plugging problem of signal holes in steel containers(any other metal containers are also applicable) were analysed and discussed. For the first time, a new type of plugging device was researched and developed, which could avoid crevice corrosion in the signal hole area. After practical application, the integrity and reliability of the container system of nuclear power plants were effectively improved, and the nuclear safety was effectively guaranteed. The plugging device is not limited to nuclear power plants and steel categories. It has reference significance for other industries and containers made of other materials.