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Pipe-wall-thinning measurement technique employing electromagnetic acoustic resonance and its application to power plant piping TAKAGI Toshiyuki1,2, URAYAMA Ryoichi1, UCHIMOTO Tetsuya1,2, and SUN Hongjun1 1. Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan (takagi@ifs.touhoku.ac.jp)
2. ELyTMaX, UMI3757,CNRS–Université de Lyon–Tohoku University, International Joint Unit, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
Abstract: In power plants, the acceleration of corrosion thinning in piping from aging is of concern. Maintaining the safety of plant systems from such deterioration is desired. An inspection method of pipe-wall thinning is proposed using an electromagnetic acoustic transducer and has been studied for its applicability to actual piping. The inspection through measurement and signal processing uses the electromagnetic acoustic resonance method and superposition of the n-th compression. Measurement at a BWR simulated equipment was performed under a high temperature environment and the applicability of the method was evaluated. In this study the method of measuring wall thickness was applied and evaluated the performance of the pipes iof the actual plant where flow-accelerated corrosion had occurred. In addition, the pipe thickness was measured at a power plant during operation and monitored pipe-wall thickness during the plant decommissioning to evaluate the applicability of the used measurement method.
Keyword: pipe wall thickness inspection; electromagnetic acoustic resonance method; monitoring system; power plant
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