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Hoshino, Seiichi; Yamada, Fumika; Negishi, Kumi*; Mukai, Masayuki; Iida, Yoshihisa; Yamaguchi, Tetsuji; Tanaka, Tadao; Nakayama, Shinichi
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Kimura, Yuichiro; Yamaguchi, Tetsuji; Iida, Yoshihisa; Otsuka, Ichiro; Taki, Hiroshi*; Mukai, Masayuki; Yamada, Fumika; Hoshino, Seiichi; Kadowaki, Mitsushi; Tanaka, Tadao; et al.
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Sawaguchi, Takuma; Takeda, Seiji; Sasaki, Toshihisa; Ochiai, Toru; Watanabe, Masatoshi; Kimura, Hideo
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Torata, Shinichiro
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Kanzaki, Yutaka; Takeda, Seiji; Kimura, Hideo
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Ijiri, Yuji*; Nago, Makito*; Kinomura, Koji*; Sugihara, Yutaka*; Shigehiro, Michiko*; Sato, Masaru*; Kunimaru, Takanori
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This paper presents the in-situ measurement data and the results of simulation analyses in order to develop technologies for monitoring rock behaviors using tiltmeters placed near ground surface. From the data, it is shown that the tiltmeters are able to capture the rock behaviors due to shaft excavations and concrete placements and are very sensitive to capture earthquakes, change in barometrical pressure and tide as well as the movements of heavy-construction-equipments. The applicability of inverse analysis for identifying the rock properties using tilting displacement data associated with construction activity is demonstrated by elastic analyses. In addition, the applicability of tiltmeters for monitoring high-permeable zones is also demonstrated by Hydro-Mechanical coupling analysis, because the groundwater flow toward the shaft along high-permeable zone cause an increase in the rate of tilting displacement and change in displacement mode.
Mizukoshi, Seiji; Sukegawa, Takenori; Nakayama, Shinichi
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Technical information including available technologies and residual radioactive contamination is required to establish safety standards for regulatory review for the future decommissioning of nuclear fuel facilities. We have acquired the technical information on the past and on-going decommissioning projects of domestic and foreign nuclear fuel facilities. This report presents the information and the study on the safety issues concerning the decommissioning of fuel reprocessing facilities.
" to support scenario analysis for safety assessment of HLW geological disposalMakino, Hitoshi; Kawamura, Makoto; Wakasugi, Keiichiro*; Okubo, Hiroo*; Takase, Hiroyasu*
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Kunimaru, Takanori; Ota, Kunio; Abe, Hironobu; Yamaguchi, Takehiro; Ishii, Eiichi; Kurikami, Hiroshi; Tomura, Goji; Shibano, Kazunori; Hama, Katsuhiro; Matsui, Hiroya; et al.
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The Horonobe Underground Research Laboratory (URL) Project is being pursued by the Japan Atomic Energy Agency (JAEA) to enhance the reliability of relevant disposal technologies through investigations of the deep geological environment within the host sedimentary formations at Horonobe, northern Hokkaido. The project consists of two major research areas, "Geoscientific Research" and "R&D on Geological Disposal", and proceeds in three overlapping phases, "Phase I: Surface-based investigation", "Phase II: Construction" and "Phase III: Operation", over a period of 20 years. The present report summarises the results of the Phase I geoscientific research carried out from March 2001 to March 2005. Integration of work from different disciplines into a "geosynthesis" ensures that the Phase I goals have been successfully achieved and identifies key issues that need to be addressed in the Phase II/III investigations.
Miyahara, Kaname; Kato, Tomoko
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Complementary safety indicators, such as flux, can avoid uncertainties in the biosphere modeling used to estimate conventional dose or risk. These uncertainties inevitably arise from the assumptions made regarding future human behavior. Natural radionuclide fluxes due to geological processes can potentially be used for this purpose. Radionuclide fluxes from hypothetical repositories are estimated on the basis of models. For the present purpose, the H12 generic conceptual model is selected. At the discharge point from the MWCF to the aquifer, these fluxes are compared with the fluxes of natural radionuclides in such groundwater. The advantage of this particular yardstick is that it does not include any of the complex and highly site-specific processes in the surface environment. This paper discusses the relevance of this yardstick for illustrating the effectiveness of the natural and engineered barriers currently assessed by this model.
Sanada, Hiroyuki; Hanakawa, Toshiyuki; Ota, Kunio; Abe, Hironobu; Yamaguchi, Takehiro; Kunimaru, Takanori; Ishii, Eiichi; Kurikami, Hiroshi; Tomura, Goji; Shibano, Kazunori; et al.
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Seno, Yasuhiro; Hirano, Toru; Nakama, Shigeo
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Seno, Yasuhiro; Saegusa, Hiromitsu; Amano, Kenji; Tsuruta, Tadahiko; Takeuchi, Ryuji; Matsuoka, Toshiyuki; Mizuno, Takashi; Hama, Katsuhiro; Uchida, Masahiro; Semba, Takeshi
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Kuji, Masayoshi; Mikake, Shinichiro; Kuroda, Hidetaka; Sugihara, Kozo; Sato, Toshinori
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Saegusa, Hiromitsu; Onoe, Hironori; Takeuchi, Ryuji; Oyama, Takuya
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The poster reports the results of hydrogeological studies on the Surface-based Investigation (Phase I) at the Mizunami Underground Laboratory Project. The hydrogeological studies have been carried out in order to understand (1) groundwater flow characteristics, (2) dilution of nuclides, (3) volume of inflow into underground tunnels, and (4) impact induced by construction of underground tunnels on water table and hydraulic pressure. The poster compiles the main results to be understood these items, and technical findings and know-how which can serve as foundation to disposal business.
Seno, Yasuhiro; Saegusa, Hiromitsu; Amano, Kenji; Tsuruta, Tadahiko; Matsuoka, Toshiyuki; Takeuchi, Ryuji; Mizuno, Takashi; Uchida, Masahiro
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Uchida, Masahiro; Hatanaka, Koichiro
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The surface-based investigations in Mizunami and Horonobe Underground Research Laboratories are completed and the results are compiled in a series of reports in March, 2007. The Mizunami Underground Research Laboratory in Mizunami city of Gifu Prefecture targets fractured crystalline rock, whereas the Horonobe Underground Research Laboratory targets the porous Tertiary sedimentary rocks. The report aims to provide the technical basis for the surface-based investigation during preliminary investigations and the detailed investigations by implementing body as well as safety regulations. The presenation summarizes the outline of the series of reports on the surafce-based investigations.
Amano, Kenji; Tsuruta, Tadahiko; Matsuoka, Toshiyuki; Abumi, Kensho; Hodotsuka, Yasuyuki
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Mizuno, Takashi; Hama, Katsuhiro; Yoshida, Haruo; Sai, Masataka; Amano, Yuki; Hagiwara, Hiroki
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Kitamura, Akira; Shibata, Masahiro; Yamaguchi, Tetsuji; Yui, Mikazu; Yamaguchi, Kohei*
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Solubility of radionuclides in geological disposal of HLW was determined using two activity coefficient models (Davies model and SIT model). The obtained values were compared and discussed.