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<p>In pressurized nuclear power plants, metallic tubes such as steam generator (SG) tubes are subject to complex mechanical and environmental loads that can lead to crack initiation and propagation. Evaluating the structural integrity of SG tubes requires non-destructive assessment of crack size and location. Current inversion schemes can determine crack shape but lack position information, and reconstruction using a single coil has low efficiency. While array probes improve defect detection, reconstruction research based on array signals is challenging due to the complexity of processing multiple sets of signals. This study proposes a simple and effective array reconstruction scheme utilizing signals from two adjacent coils near the crack, enabling simultaneous determination of both crack shape and location through interpolation techniques. Numerical results validate this new crack sizing method, showing accurate reconstruction of both size and location.</p>

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A Numerical Scheme for Crack Reconstruction in Tubes by Signals of Array Eddy Current Testing Probe

  • 期刊论文

  • 发表日期：

    2025年5月7日

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  • Wei Guo,
  • Yingsong Zhao,
  • Mengling Yang,
  • Shejuan Xie,
  • Zhenmao Chen

摘要

In pressurized nuclear power plants, metallic tubes such as steam generator (SG) tubes are subject to complex mechanical and environmental loads that can lead to crack initiation and propagation. Evaluating the structural integrity of SG tubes requires non-destructive assessment of crack size and location. Current inversion schemes can determine crack shape but lack position information, and reconstruction using a single coil has low efficiency. While array probes improve defect detection, reconstruction research based on array signals is challenging due to the complexity of processing multiple sets of signals. This study proposes a simple and effective array reconstruction scheme utilizing signals from two adjacent coils near the crack, enabling simultaneous determination of both crack shape and location through interpolation techniques. Numerical results validate this new crack sizing method, showing accurate reconstruction of both size and location.