Oxide film thickness measurement of fuel rod cladding based on multi-frequency eddy current technology
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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1 μm,可用于燃料包壳管氧化膜厚度的量化表征。
Abstract: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.
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Table 2 不同尺寸线圈的灵敏度
外径/mm 厚度/mm 高度/mm Δ/% 外径/mm 厚度/mm 高度/mm Δ/% 2.6 0.6 0.3 0.098 4.6 0.6 0.3 0.109 0.5 0.084 0.5 0.100 0.7 0.073 0.7 0.089 1.0 0.061 1.0 0.077 0.8 0.3 0.099 0.8 0.3 0.117 0.5 0.084 0.5 0.106 0.7 0.072 0.7 0.096 1.0 0.060 1.0 0.084 1.0 0.3 0.098 1.0 0.3 0.124 0.5 0.083 0.5 0.111 0.7 0.071 0.7 0.100 1.0 0.059 1.0 0.087 3.6 0.6 0.3 0.112 5.6 0.6 0.3 0.100 0.5 0.100 0.5 0.092 0.7 0.089 0.7 0.086 1.0 0.077 1.0 0.077 0.8 0.3 0.118 0.8 0.3 0.108 0.5 0.104 0.5 0.099 0.7 0.093 0.7 0.091 1.0 0.079 1.0 0.082 1.0 0.3 0.123 1.0 0.3 0.115 0.5 0.107 0.5 0.105 0.7 0.095 0.7 0.096 1.0 0.080 1.0 0.086 
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Table 3 包壳管电导率影响分析时的仿真参数
项目 电导率/（mS·m-1） 相对磁导率 厚度/μm 包壳管1 0.805 1 570 包壳管2 1.43 1 570 金属涂层 7.57 1 15 氧化膜1 0 1 3 氧化膜2 0 1 5 氧化膜3 0 1 7 氧化膜4 0 1 9
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Table 6 多频仿真参数设置
项目 电导率/（mS·m-1） 相对磁导率 厚度/μm 包壳管1 1.68 1 570 包壳管2 1.43 1 570 包壳管3 1.10 1 570 金属涂层1 7.57 1 6 金属涂层2 7.57 1 8 金属涂层3 7.57 1 10 金属涂层4 7.57 1 12 金属涂层5 7.57 1 15 金属涂层6 7.57 1 18 金属涂层7 7.57 1 20 氧化膜1 0 1 3 氧化膜2 0 1 5 氧化膜3 0 1 7 氧化膜4 0 1 9
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Table 7 氧化膜厚度的测量值(h′)
h d 7 13 14 17 19 2 2.331 2 2.274 3 2.190 9 2.058 8 1.741 1 3 3.359 0 3.181 5 3.295 1 3.137 9 2.979 8 4 4.406 3 4.255 2 4.206 3 4.107 2 3.840 8 5 5.339 7 5.218 1 5.322 1 5.087 3 4.810 9 6 6.441 9 6.221 9 6.250 6 6.187 5 5.704 4 7 7.224 8 7.280 6 7.229 1 7.012 3 6.882 6 8 8.360 8 8.243 5 8.296 4 8.080 3 7.991 3 9 9.242 9 9.264 7 9.332 5 9.095 8 8.855 7 10 10.321 0 10.266 5 10.268 1 10.109 4 9.764 5
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