基于多频涡流技术的燃料棒包壳管氧化膜厚度测量方法  

Oxide film thickness measurement of fuel rod cladding based on multi-frequency eddy current technology

作　　者：周国正[1] 陶钰 张娜 梁军[1] 许小兵 叶朝锋 ZHOU Guozheng;TAO Yu;ZHANG Na;LIANG Jun;XU Xiaobing;YE Chaofeng(Suzhou Nuclear Power Research Institute Co.,Ltd.,Suzhou 215008,China;School of Information Science and Technology,Shanghai Tech University,Shanghai 201210,China)

机构地区：[1]苏州热工研究院有限公司,苏州215008 [2]上海科技大学信息科学与技术学院,上海201210

出　　处：《无损检测》2024年第5期62-68,共7页Nondestructive Testing

摘　　要：核燃料棒包壳管表面的氧化膜会影响其导热性能,使燃料棒的温度上升,加快燃料包壳的腐蚀速度,给反应堆带来潜在安全风险。故有必要对氧化膜厚度进行精确测量。为此,构建了燃料棒包壳管的三维有限元仿真模型,对燃料包壳多频检测进行了分析,总结了激励频率、包壳管电导率和金属涂层厚度对氧化膜测量结果的影响规律;提出了融合多频测量数据,抑制干扰因素影响,精确计算氧化膜厚度的方法,并进行了试验验证。结果表明,该方法的氧化膜厚度计算误差小于1μm,可用于燃料包壳管氧化膜厚度的量化表征。The oxide film on the surface of the nuclear fuel rod cladding will seriously affect its thermal conductivity,increase the temperature of the fuel rod,accelerate the corrosion rate of the fuel rod,and bring potential safety risks to the reactor.So,it is necessary to accurately measure the thickness of oxide film.In this paper,a three-dimensional finite element simulation model of fuel rod cladding tube was constructed,and the multi-frequency detection of fuel cladding was simulated.The influences of excitation frequency,cladding tube conductivity and metal coating thickness on the measurement results of oxide film were analyzed.A method of accurately calculating the thickness of oxide film was proposed by combining multi-frequency measurement data to suppress the influence of interference factors.The results showed that the calculation error of the oxide film thickness was less than 1 micron,and the method can be used for quantitative characterization of the oxide film thickness of fuel cladding.

关 键 词：包壳管氧化膜 涡流检测 有限元仿真 多频测量 参数分离 

分 类 号：TL292[核科学技术—核燃料循环与材料] TG115.28[金属学及工艺—物理冶金]