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工程设计学报
Chin J Eng Design  2023, Vol. 30 Issue (3): 372-379    DOI: 10.3785/j.issn.1006-754X.2023.00.035
Tribology and Surface/Interface Technology     
Research on crack detection of butt welds in the cladding panel of spent fuel pool
Jia ZHANG1(),Zhaoming ZHOU1,2(),Zhanghua LIAN1,Kai LI3,Zhi CHEN4
1.State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
2.School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China
3.State Nuclear Power Plant Service Company, Shanghai 200233, China
4.Sichuan Changning Natural Gas Development Co. , Ltd. , PetroChina Southwest Oil and Gasfield Company, Chengdu 610051, China
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Abstract  

Cracks at the interface between the weld in the cladding panel of spent fuel pool of a nuclear power plant and the base material can seriously affect the operational safety of the equipment. Considering the true characteristics of weld, alternating current field measurement (ACFM) technology was proposed to detect weld crack to improve the sensitivity of crack detection. Firstly, a weld crack detection model was established by COMSOL software, and the magnetic field characteristic signals in the weld crack area were analyzed; secondly, an artificial crack that was consistent with the numerical simulation was preset at the interface between the experimental specimen weld and the base material, and then the weld crack ACFM experiment was carried out; finally, a weld crack detection system was developed and its performance testing was conducted. The simulation, experiment and testing results indicated that the ACFM method could effectively identify crack parallel to the weld direction at the interface between the weld and the base metal, but could not identify crack perpendicular to the weld direction; the deviation of crack detection length obtained through the testing of the weld crack detection system was smaller than that obtained through the probe detection experiment, but the two were relatively close, proving the rationality of the design of the weld crack detection system. ACFM can achieve quantitative detection of butt welds in the cladding panel of spent fuel pool, and meet the requirements of high sensitivity in the field.

Key words： spent fuel pool      weld crack      electromagnetic testing     
Received: 15 September 2022      Published: 06 July 2023
CLC:  TH878.3  
Corresponding Authors: Zhaoming ZHOU     E-mail: zhangjiaswpu@163.com;Zhouzhaom@126.com
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Jia ZHANG
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Cite this article:

Jia ZHANG,Zhaoming ZHOU,Zhanghua LIAN,Kai LI,Zhi CHEN. Research on crack detection of butt welds in the cladding panel of spent fuel pool. Chin J Eng Design, 2023, 30(3): 372-379.

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https://www.zjujournals.com/gcsjxb/10.3785/j.issn.1006-754X.2023.00.035     OR     https://www.zjujournals.com/gcsjxb/Y2023/V30/I3/372


乏燃料水池覆面板对接焊缝裂纹检测研究

核电站乏燃料水池覆面板焊缝与母材交界面处的裂纹会严重影响设备的运行安全。考虑焊缝的真实特性，提出采用交流电磁场检测（alternating current field measurement，ACFM）技术来检测焊缝裂纹，以提高裂纹检测的灵敏度。首先，采用COMSOL软件建立了焊缝裂纹检测模型，分析了焊缝裂纹区域的磁场特征信号；其次，在实验试件焊缝与母材交界面处预置与数值仿真一致的人工裂纹，进行焊缝裂纹ACFM实验；最后，制作了焊缝裂纹检测系统，并进行了其性能测试。仿真、实验和测试结果表明：ACFM方法能够有效识别焊缝与母材交界面处平行于焊缝方向的裂纹，而不能识别垂直于焊缝方向的裂纹；通过焊缝裂纹检测系统测试得到的裂纹检测长度的偏差小于探头检测实验的偏差，但两者比较接近，证明了焊缝裂纹检测系统设计的合理性。ACFM能够实现乏池覆面板对接焊缝裂纹的定量化检测，满足现场高灵敏度的使用要求。


关键词： 乏燃料水池,  焊缝裂纹,  电磁检测 
Fig.1 Schematic diagram of the effect of crack on current and magnetic field
Fig.2 Simplified model of spent fuel pool cladding panel
部件材料长度×宽度×深度（高度）/mm×mm×mm相对磁导率电导率/(S·m-1)
试件碳钢工件焊缝裂纹1.000 02138 000 000
300×300×1020×0.3×8
U形铁芯锰-锌铁氧体60×10×404 00010 300 000
Table 1 Parameters of weld crack detection model
Fig.3 Grid division of weld crack detection model
Fig.4 Stress distribution on the surface of workpiece
Fig.5 Magnetic field distribution around the crack
Fig.6 Size and location of weld cracks
Fig.7 ACFM results of weld cracks
序号裂纹长度检测长度偏差探头检测方向
①2019.80.2平行于裂纹方向
②2019.40.6
③2525.10.1
④1011.41.4
④10—垂直于裂纹方向
Table 2 ACFM simulation results of weld crack length
Fig.8 ACFM experiment site for weld cracks
Fig.9 ACFM experimental results of weld cracks
序号裂纹长度检测长度偏差探头检测方向
①2018.41.6平行于裂纹方向
②2017.82.2
③2523.11.9
④107.92.1
④10—垂直于裂纹方向
Table 3 ACFM experimental results of weld crack length
Fig.10 Detection system of butt weld crack in the cladding panel of spent fuel pool
Fig.11 Detection signal of weld cracks
序号裂纹长度检测长度偏差探头检测方向
①2019.01.0平行于裂纹方向
②2018.21.8
③2523.41.6
④108.11.9
④10—垂直于裂纹方向
Table 4 Testing results of weld crack length
方法裂纹①裂纹②裂纹③裂纹④
数值仿真0.20.60.11.4
探头实验1.62.21.92.1
检测系统测试1.01.81.61.9
Table 5 Deviation of weld crack detection length under different methods
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