环形核燃料元件是一种两面冷却的新型、高效和安全的燃料元件，为确保该元件环焊缝的焊接质量，对其进行了数字X射线成像检测，检测结果表明，柱面环焊缝射线检测图像灵敏度（最小可见丝径）达0.20 mm，端部环焊缝射线检测图像灵敏度达0.10 mm。通过金相试验进一步验证了该检测方法可满足该类焊缝的质量评价要求。

Annular nuclear fuel element is a new, efficient and safe fuel element cooled on both sides. In order to ensure the welding quality of the circumferential weld of the element, the digital X-ray imaging detection is carried out. The detection results show that the image sensitivity (minimum visible wire diameter) of cylindrical girth weld is 0. 20 mm, and that of end girth weld is 0. 10 mm. The metallographic test further verifies that the detection method can meet the requirements of the quality evaluation of the welds.