对AP1000压水堆核电站安全壳贯穿件的非径向管板焊接接头结构特点进行了介绍，并分析其超声检测工艺的重点和难点。通过建立统一的缺陷定位坐标系并结合被检构件的几何特点进行综合分析，推导得出了h值（缺陷回波最高点距套管外壁的距离）的计算方法。为超声检测对这类焊接接头缺陷的准确识别和定位提供了行之有效的方法，为解决这类焊接接头的超声检测技术受限区提供了行之有效的措施。

In this paper, the structural characteristics of the non-radial pipe-plate welded joints for containment penetrations in AP1000 PWR nuclear power plants are presented, and the key points and difficulties of ultrasonic testing process are analyzed. By establishing a unified defect positioning coordinate system and combining the geometric characteristics of the testing component, the h-value (Distance of the maximum of defects echo amplitude from the outer wall of the casing) is derived from the comprehensive analysis. The aim of the research is to provide ultrasonic testing with an effective method for the accurate identification and localization of defects in such welded joints. It can also provide effective measures for the ultrasonic testing of some technical restricted areas of this type of welded joints.