The in service inspection (ISI) of MONJU fast breeder reactor vessel is performed in a severe environment at elevated temperature (about 200 °C ) and high-level radiation field (about 10Sv/h). Liquid sodium is used as the coolant of MONJU reactor. A horizontally polarized shear (SH) wave electromagnetic acoustic transducer (EMAT) is used to perform the volumetric inspection of the MONJU reactor vessel. In this paper, the magnetic flux density and the sound pressure distributions for the SH wave EMAT with a so-called Halbach magnet structure are analyzed from room temperature up to 240°C. The magnetic flux density and the sound pressure of the EMAT decrease with the increase of temperature. At 200°C, the relative reduction of the peak magnetic flux density and the relative thermal demagnetization at liftoff distance 0.5mm are less than 9% and 2%, respectively. This thermal demagnetization can be understood by analyzing the distribution of the permeance coefficient. As a result, the Halbach magnet structure can be used at elevated temperatures without large performance reductions as compared to its performance at room temperature. The Halbach EMAT will demonstrate good performance not only at room temperature but also at high temperature up to 240°C. This new structure EMAT is suitable for MONJU reactor vessel ISI.
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ASME/JSME 2004 Pressure Vessels and Piping Conference
July 25–29, 2004
San Diego, California, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4679-2
PROCEEDINGS PAPER
Characterization of SH Wave Electromagnetic Acoustic Transducer (EMAT) at Elevated Temperature
Yang Xu,
Yang Xu
Japan Nuclear Cycle Development Institute, Tsuruga City, Fukui, Japan
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Akihiro Tagawa,
Akihiro Tagawa
Japan Nuclear Cycle Development Institute, Tsuruga City, Fukui, Japan
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Masashi Ueda,
Masashi Ueda
Japan Nuclear Cycle Development Institute, Tsuruga City, Fukui, Japan
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Takuya Yamashita,
Takuya Yamashita
Japan Nuclear Cycle Development Institute, Tsuruga City, Fukui, Japan
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Yusuke Ohtsuka,
Yusuke Ohtsuka
Osaka University, Osaka, Japan
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Kazunori Osafune,
Kazunori Osafune
Osaka University, Osaka, Japan
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Masahiro Nishikawa
Masahiro Nishikawa
Osaka University, Osaka, Japan
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Yang Xu
Japan Nuclear Cycle Development Institute, Tsuruga City, Fukui, Japan
Akihiro Tagawa
Japan Nuclear Cycle Development Institute, Tsuruga City, Fukui, Japan
Masashi Ueda
Japan Nuclear Cycle Development Institute, Tsuruga City, Fukui, Japan
Takuya Yamashita
Japan Nuclear Cycle Development Institute, Tsuruga City, Fukui, Japan
Yusuke Ohtsuka
Osaka University, Osaka, Japan
Kazunori Osafune
Osaka University, Osaka, Japan
Masahiro Nishikawa
Osaka University, Osaka, Japan
Paper No:
PVP2004-2834, pp. 177-184; 8 pages
Published Online:
August 12, 2008
Citation
Xu, Y, Tagawa, A, Ueda, M, Yamashita, T, Ohtsuka, Y, Osafune, K, & Nishikawa, M. "Characterization of SH Wave Electromagnetic Acoustic Transducer (EMAT) at Elevated Temperature." Proceedings of the ASME/JSME 2004 Pressure Vessels and Piping Conference. Recent Advances in Nondestructive Evaluation Techniques for Material Science and Industries. San Diego, California, USA. July 25–29, 2004. pp. 177-184. ASME. https://doi.org/10.1115/PVP2004-2834
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