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Hiraiwa, Kenichi*; Hirai, Kazuhide*; Sano, Tadashi*; Osawa, Hideaki; Sato, Toshinori; Aoyagi, Yoshiaki; Fujita, Tomoo; Aoyagi, Kazuhei; Inagaki, Daisuke*
JAEA-Technology 2015-033, 50 Pages, 2015/11
Japan Atomic Energy Agency (hereinafter referred to as JAEA) has been conducted a geoscientific research and development project at the Mizunami Underground Research Laboratory and the Horonobe Underground Research Laboratory in order to construct scientific and technological basis for geological disposal. As a collaborative research between JAEA and Tokyo Sokki Kenkyujo Co., Ltd. (hereinafter referred to as TML), we focused on the fiber-optic crack detection sensor developed by TML as a method to detect cracks in the support system that may affect the stability of rock cavern during the operation. To verify long-term safety performance of the sensor for decades, "Evaluation test of long-term durability of fiber-optic crack detection sensor and the support system" at the Mizunami Underground Research Laboratory and "Performance evaluation test of fiber-optic crack detection sensor for in-situ crack detection" at the Horonobe Underground Laboratory Research Laboratory were conducted. As the result, we understand that fiber-optic crack detection sensor is applicable measurement method to promptly detect the cracks in the support system.
Hashizume, Shigeru; Sato, Toshinori; Horiuchi, Yasuharu; Sueyoshi, Yoshitoshi*; Sano, Tadashi*; Hirai, Kazuhide*
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no abstracts in English
Horiuchi, Yasuharu; Sato, Toshinori; Sueyoshi, Yoshitoshi*; Sano, Tadashi*; Hirai, Kazuhide*
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no abstracts in English
Sato, Toshinori; Aoyagi, Yoshiaki; Hirai, Kazuhide*; Sato, Hiroshi*; Sano, Tadashi*
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As a part of validation of the technology to ensure safety on the basic development of the engineering technology for deep underground applications, applicability of the optical fiber sensor for crack detection, which developed by Tokyo Sokki Kenkyujo Co.Ltd., is being evaluated as a collaborative research between JAEA and Tokyo Sokki Kenkyujo Co.Ltd. In this study, evaluation of long-term stability of the optical fiber sensor installed in the -300m Stage at the Mizunami Underground Research Laboratory Constriction Site is being conducted.