通过对AP1000核电机组钢制安全壳的涂层密集浮锈、涂层缺失和涂层点蚀等缺陷的机理分析，结合钢制安全壳的特殊结构及特殊工作环境，从缺陷检测的可达性、覆盖性、安全性和可靠性等方面，提出了一套搭载线性阵列摄像头的磁吸附爬行方式检查方案，并完成研发和制造，成功实施了AP1000核电机组的役前检查，该方案可广泛应用于钢制安全壳领域，为核安全的评估和分析提供详实可靠的数据，可以为安全壳的安全运行提供保障。

The domestic AP1000 units have been built and their pre-service inspection is an imminent task, and there is however, a lack of any experience for reference at home and abroad for the inspection. Based on the mechanism analysis on steel safety shell coating dense rust, coating missing and pitting defects, combined with the special structure of steel containment and its special working environment, and at the same time considering the accessibility of a defect inspection method, its coverage area together with its safety and reliability, a set of magnetic adsorption crawling inspection devices equipped with linear array camera was put forward and developed, which was successfully implemented for the pre-service examination of AP1000. This inspection scheme can be widely used in the steel containment and it provides detailed and reliable data for nuclear safety assessment and analysis on the whole shell area and plays a safeguard function for the safe operation of the containment.