ITER 托卡马克装置极向场线圈需要大量CICC 超导线缆，不锈钢铠甲套管是其重要组成部分，具有承力和液氦冷却剂容器的功能。为确保极向场线圈的安全，需要采用无损检测方法对套管产品质量进行检测、控制。由于PF线圈不锈钢套管外方内圆的截面形状，目前国内尚未确立对应的无损检测方法，需要开发新的检测系统。针对上述问题，提出了基于常规水浸超声与相控阵水浸超声的无损检测方法，通过制作包含人工缺陷的模拟试件，对水浸超声检测方法的有效性进行了试验验证，结果表明，该方法可满足铠甲套管的无损检测要求。

The poloidal field(PF) coils in ITER Tokamak device require a lot of superconducting cables in conduit conductors(CICC), stainless steel conduit tube is an important part of the CICC as it is the container of cooling liquid Helium and supporting structure of the electromagnetic load. To ensure the safety of the PF coil, nondestructive testing has to be performed for each conduit tube of CICC. However, because of outer square inter round cross section shape of the PF stainless steel conduit tube, the domestic corresponding NDT method hasnt established, so need to develop new testing system. Aiming at this problem, the approach of immersed ultrasonic testing method using single focus transducer or phased array probe was proposed, and through fabricating samples with artificial defects, the validity of this approach was verified. The experimental results showed that the approach was promising for the NDT of the ITER conduit tubes.