CPR1000压水堆核电厂磁粉检测替代渗透检测的可行性探讨

Feasibility Study on the Replacement of PT with MT in CPR1000 PWR Nuclear Power Plants

CPR1000压水堆核电厂大量采用铁磁性材料,表面缺陷检查基本采用渗透检测技术。在确定的试验环境条件和参数下,通过对BOSS焊缝、90°角焊缝、搭接焊缝以及小型部件(异形件)分别采用磁粉检测和渗透检测进行对比试验,探讨磁粉检测技术替代渗透检测技术的可行性。试验结果表明,在铁磁性材料工件上,磁粉检测比渗透检测对缺陷的灵敏度和检出率更高,操作时间更短,缺陷显示的形貌更完整且不扩散。因此,在铁磁性材料工件上用磁粉检测替代渗透检测是可行和可靠的。

In CPR1000 PWR nuclear power plants, many devices are made of ferromagnetic materials, whose surface defects inspection usually uses the liquid penetration examination. Under the determined environmental conditions and parameters, comparison tests between PT and MT for BOSS welds, 90 ° fillet welds, lap welds, and shaped pieces are carried out respectively, in order to study the feasibility of the replacement of PT with MT. The experimental results show that, for the workpieces made of ferromagnetic materials, MT has a higher detection rate of defects, higher detection sensitivity, and a shorter operating time than PT, and the defective display of MT is more complete and nondiffusible. Therefore, the replacement of PT with MT is feasible and reliable.