基于交流电场测量的核电厂乏燃料池板焊接缺陷检测:实验与有限元分析

Zhaoming Zhou, Chunfu Yang, Liyan Liu, Donghong Zhao, Kai Li
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摘要

核电站乏燃料池覆盖层易发生腐蚀并产生微裂纹缺陷。表面裂纹缺陷倾向于垂直、水平和斜向扩展,造成乏燃料池覆盖板和焊缝的损伤和断裂。传统的无损检测方法无法实时完成水下检测。为了提高裂纹检测的及时性,缩短检测周期,本文基于交流电场测量(ACFM)对乏燃料池覆层板表面裂纹的精确检测技术进行了研究,并对乏燃料池覆层板焊缝缺陷检测工艺进行了优化。本文假设了不同类型的人为缺陷,研究了人为缺陷引起的磁场特征信号畸变。通过建立缺陷电磁检测模型进行数值计算,研究了不同缺陷区域产生的磁场信号的特征。最后,对实验结果和数值结果进行了对比分析。结果表明,ACFM能够快速有效地检测出乏燃料池覆盖板的基材、焊缝和界面裂纹,具有精度高、分辨率高、灵敏度高、时延低等特点。研究结果为现场乏燃料池潜在裂缝的电磁检测和水下结构缺陷的早期裂纹预警提供了技术支持,具有较好的应用价值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Welding defect detection in nuclear power plant spent fuel pool panels based on alternating current field measurement: experimental and finite element analysis
The overlay panels of spent fuel pools of nuclear power plants can easily become corroded and produce micro-crack defects. Surface crack defects tend to expand vertically, horizontally and obliquely, causing damage and fracture to the overlay panels and welds of spent fuel pools. Traditional non-destructive testing (NDT) cannot complete underwater testing in real time. In order to improve the timeliness of crack detection and shorten the inspection period, research on accurate inspection technology for surface cracks in the overlay panels of spent fuel pools is carried out in this paper based on alternating current field measurement (ACFM) and the weld defect detection process for the cladding panels of spent pools is optimised. In this work, different types of artificial defect are assumed and the distortion of the magnetic field characteristic signal caused by the defects is studied. The characteristics of magnetic field signals generated in different defect regions are studied by establishing a defect electromagnetic detection model for numerical calculation. Finally, experimental and numerical results are compared and analysed. The results show that ACFM can be used to quickly and effectively inspect for cracks in the base material, weld and interface of spent fuel pool overlay panels and it has the characteristics of accuracy, high resolution, high sensitivity and low delay. The research results, which have good application value, provide technical support for electromagnetic inspection of latent cracks in field spent fuel pools and early crack warning of underwater structural defects.
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