针对传统胶片射线检测技术对结构复杂、壁厚大的高磅级核电阀体难以进行全体积检测的问题，以典型产品直径为6 inch （1 inch=25.4 mm），承载质量为1 500 lb （1 lb=0.45 kg）的止回阀为例，分别从检测区域的划分和标识，双胶片技术、厚度补偿块技术和预曝光技术的应用等方面优化了检测工艺，优化后的工艺能达到规范要求的全体积检测的目的，可为同行提供参考。

Aiming at the problem that traditional film radiographic inspection technology is difficult to perform full volume inspection of high pound nuclear power valve body with complex structures and large wall thickness,this paper taking a typical product with diameter is 6 inch(1 inch=25. 4 mm) and the bearing mass is 1500 lb (1 lb=0. 45 kg) check valve as an example, The detection process is optimized from the division and identification of detection area, the application of double films technology, thickness compensation block technology and pre-exposure technology to achieve the purpose of full volume inspection as required by the specification, which can provide a reference for peers.