针对中外核电射线插塞的泄漏失效问题，从插塞设计、安装和焊接工艺、无损检查、役前（在役）检查工法等方面综合进行了工艺工法创新和焊接质量控制。结果表明，通过在第三代核电华龙一号机组主蒸汽、主给水系统管道焊缝的役前、在役检查方面采用超声波检查，超声波检查不可达区域补做射线；经国家核安全局同意在主给水系统上取消插塞设计，主蒸汽系统上插塞由可拆卸式改型为一次性，管座焊脚尺寸由4 mm增大至8.5 mm；此外，两系统的管座、插塞部位采用钨极氩弧焊，并将插塞与管座之间的连接型式由对接密封焊改为角接密封焊。工程建设和机组运营期间降低了检验成本，缩短了机组大修关键路径时间，极大地提高了核电厂管道系统完整性、可靠性，有效保障了核安全。

In response to the leakage failure problems of nuclear power radiographic plugs in China and foreign countries, technological and process innovations and welding quality control were comprehensively carried out in terms of plug design, installation and welding technology, non-destructive testing, pre-service (in-service inspection) inspection methods, etc. The results show that by using UT(ultrasonic testing) for PSI(pre-service inspection) and ISI (in-service inspection) of the welds of the main steam and feedwater system pipelines of the third-generation nuclear power HPR1000, and performing supplementary radiographic testing in the areas not accessible to ultrasonic testing. With the consent of National Nuclear Safety Administration, the plug design was cancelled in the main feedwater system, and the plugs in the main steam system were changed from reusable type to disposable type, and the weld throat size of the pipe seat was increased from 4 mm to 8.5 mm. In addition, the pipe seats and plug parts of the two systems adopted tungsten inert gas(TIG), and the connection type between the plug and the pipe seat was changed from butt seal welding to fillet seal welding. During the engineering construction and unit operation, the non-destructive testing(NDT) cost was reduced, the key path time of the unit overhaul was shortened, the integrity and reliability of the nuclear power plant pipeline system were greatly improved, and nuclear safety was effectively guaranteed.