Ultrasonic Inspection & Data Analysis for Failed Fuel Assembly
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摘要: 为安全、有效、准确地通过超声检测方法定位核电厂破损燃料组件，根据破损前后燃料棒包壳内壁介质状态会造成包壳中周向Lamb波能量衰减差异的特点，从理论上分析了超声探头在燃料棒间隙移动过程中Lamb波在燃料棒包壳中的传播路径，并对传播声程进行了分析计算，其结果与实际检测数值偏差在±2%范围内。结合超声检测原理和声束传播特点，开发完成了燃料棒包壳回波信号自动识别算法与数据分析软件，可实现检测数据的快速分析筛选。模拟组件试验结果和现场应用均验证了该检测方法对燃料组件中泄漏单棒的破损定位检测是快速、安全、有效的，信号自动识别算法及数据分析软件是准确、可靠的，可为后续破损燃料组件的针对性修复提供依据，提高核燃料的利用率。Abstract: To safely, effectively, and accurately locate failed fuel assemblies in nuclear power plants through ultrasonic inspection methods, this study utilizes the characteristic that the medium state of the inner wall of the fuel cladding before and after damage will cause differences in the attenuation of circumferential Lamb wave energy in the cladding. The propagation path of the Lamb wave in the fuel cladding during the movement of the ultrasonic probe in the gap between fuel assemblies is analyzed theoretically, and the propagation sound path is analyzed and calculated. The deviation between the calculated results and the measured values is within ±2%. Based on the principle of ultrasonic detection and the characteristics of sound beam propagation, the automatic identification algorithm and data analysis software of fuel rod cladding echo signal are developed, which can realize the rapid analysis and screening of detection data. The test results of simulated fuel assemblies and field application verify that the detection method is fast, safe and effective in detecting the damaged location of leaking rods in fuel assemblies, and the automatic signal identification algorithm and data analysis software are accurate and reliable, which can provide a basis for the targeted repair of damaged fuel assemblies in the future and improve the utilization rate of nuclear fuel.
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Key words:
- Fuel rods /
- Damage location /
- Ultrasonic inspection /
- Data analysis
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图 2 Lamb波声束燃料棒包壳内传播路径示意图
Figure 2. Schematic Diagram of Propagation Path of Lamb Wave in Fuel Cladding
图 3 Lamb波声束相邻燃料棒包壳间隙传播路径示意图
Figure 3. Schematic Diagram of Propagation Path of Lamb Wave Through the Gap between Adjacent Fuel Rods
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