针对AP1000核燃料包壳管的检测需求, 基于超声近场导波的检测原理, 提出了一种评价薄壁管质量的方法, 并通过超声特征成像图对缺陷信息进行描述。构建的检测系统能对裂纹、气孔、夹杂、分层、折叠等缺陷进行检测, 减少了漏检与误检, 检测能力达到了壁厚3%的水平, 定位定量误差均小于0.2 mm。结果表明,超声导波适用于高能耗包壳管的无损检测。

To meet the testing requirements of AP1000 nuclear fuel cladding tube, based on ultrasonic near-field guided wave principle, this paper proposes a method to evaluate the quality of thin-walled tube. Defect information is shown in the form of ultrasonic feature image. The test system can detect the defects in the tube, such as cracks, gas porosity, inclusions, lamination and folding defects, thus completely avoiding the occurrence of leak or mistakenly testing. The applicable minimum defect equivalent can reach 3% of wall thickness. Besides that, we can get the location and equivalent of the defects with an accuracy of 0.2mm. In conclusion, ultrasonic guided wave is suitable for the nondestructive evaluation of high energy consumption cladding tube.