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Wireless transmission monitoring in a geological disposal repository (II) Research and Development

  • Hisashi Takamura (a1), Hiroshi Shimbo (a1), Kazuo Okutsu (a1), Yasuhiro Suyama (a2), Kazuhiro Aoki (a2) and Ryutaro Wada (a2)...

Abstract

The development of the wireless transmission monitoring in the geological disposal repository, the underground laboratories, the test facilities and the demonstration area, will present an opportunity to provide greater flexibility and robustness to the confirmation of the barrier performance and therefore safety of repository [1]. So as to realize the wireless transmission monitoring especially in the betonite barrier, RWMC has been researching and developing the wireless data transmission system which uses the very low frequency (VLF: around 1 kHz) electromagnetic wave. In this system, transmitting and receiving is conducted through loop coil antennas. The overall transmission system is digitized and maximum 19 sensors can be connected to one transmitter. Transmission distance can be selected from several meters to several hundred meters.

This paper firstly presents the behavior of VLF electromagnetic wave propagation in the rock mass and the underground facility revealed by the in-situ transmission experiment and the analytical method evaluating the behavior of the VLF electromagnetic field in various environments. Development results of the transmitting antenna and the improvement of the transmission performance are secondly shown. The technical feasibility and the future R&D plan of the wireless monitoring in the repository are also explained.

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References

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1 RWMC: Technical report on the development of monitoring technology in the geological repository, 2002
2 Yasuhiro, S., Takamura, H., Wireless transmission monitoring in a geological disposal repository (I) Concepts and Advantages, The 33rd International symposium Scientific Basis for Nuclear Waste Management, 2009
3 Yoshimura, K., Takamura, H., Study on the feasibility of the wireless transmission technology to the monitoring in the geological disposal, Journal of Society of Exploration Geophysicists of Japan in 2003, 2003 (in Japanese)
4 Yoshimura, K., Shimbo, H., Study on the feasibility of the wireless transmission technology to the monitoring in the geological disposal (Part II), Journal of Society of Exploration Geophysicists of Japan in 2004, 2004 (in Japanese)
5 Takamura, H., Okutsu, K., Sugahara, N., S.Torata and Ouchi, J., Study on the wireless transmission characteristic in deep rock mass, Journal of Nuclear Fuel Cycle and Environment No.13, 2006 (in Japanese)
6 Takamura, H., K. Okutsu, Improving the transmission performance, Report of JSCE 2009 Annual Meeting & Annual Conference 2007, CS5-072, 2007 (in Japanese)
7 Takamrua, H., Shimbo, H., Installation of the transmitter into the bentonite, Report of JSCE 2009 Annual Meeting & Annual Conference 2008, CS5-061, 2008 (in Japanese)
8 RWMC: Technical report on Development of monitoring technology, 2008 (in Japanese)

Wireless transmission monitoring in a geological disposal repository (II) Research and Development

  • Hisashi Takamura (a1), Hiroshi Shimbo (a1), Kazuo Okutsu (a1), Yasuhiro Suyama (a2), Kazuhiro Aoki (a2) and Ryutaro Wada (a2)...

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