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減肉モニタリング用EMATの高温耐久試験結果

The Durability test result in high temperature of EMAT for pipe wall thinning monitoring

田川 明広; 藤木 一成

Tagawa, Akihiro; Fujiki, Kazunari

本研究は、EMATの高温耐久性試験結果である。これまでは、初期減磁の把握できる200$$^{circ}$$C,200時間の耐久性しか確認されていなかったが、本研究では、板厚10mmの試験片を用いて、200$$^{circ}$$C,2年間の耐久性を確認した。測定方法も2種類で測定し、パルスエコー法とパルスエコー共振法のどちらでも耐久性を有することを確認した。また、磁石ノイズを除去するフィルタも考慮した。

This study checks the high-temperature durability of the electromagnetic acoustic transducer (EMAT) for pipe wall thinning. We inserted EMAT into the oven and measured the 10 mm thickness specimen by EMAT about two years. Measurement was carried out by two kinds, a pulse echo method and a pulse echo resonance method. And high-temperature durability was checked by both of the measuring methods. Compared with the pulse echo method, the pulse echo resonance method of measurement accuracy was better. The filter processing of removing magnet signal is required high-temperature measurement. EMAT is a simple configuration of a coil and a magnetic combination. Therefore, a sensor does not break easily. Therefore, EMAT is applicable to the pipe wall thinning monitoring of a nuclear power plant.

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