在役前检验的经验基础上,详细阐述大亚湾核电站第一次换料大修期间,为提高射线照相灵敏度,缩短检验现场工作时间,提高检验成功可靠性而做的各项技术改进。几项技术改进及现场使用和检验结果表明:与役前检验结果相比较,射线照相底片清晰度更好,消除了不稳定因素,提高了灵敏度及可靠性;较大幅度减少了检验人员在放射性环境下的工 Based on the experience of pre-service inspection, the technical improvements made during the first refueling overhaul at Daya Bay Nuclear Power Station were introduced to enhance the radiographic sensitivity, shorten the working time of the inspection site and enhance the reliability of the inspection. Several technical improvements and field use and test results show that: Compared with the pre-service test results, the radiographic film definition is better, eliminating the instability, improve the sensitivity and reliability; significantly reduce the inspectors in the radioactive Environment workers