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Umeda, Koji
no journal, ,
The concept of geological disposal of HLW in Japan is based on a multibarrier system which combines a stable geological environment with an engineered barrier system. However, special consideration is given to the long-term stability of the geological environment, taking into account the fact that Japan is located in a tectonically active zone. Development of research/prediction technologies for natural phenomena has been carried out to evaluate the long-term stability of geological environment in any given site.
Yuguchi, Takashi; Sasao, Eiji; Ishibashi, Masayuki; Nishiyama, Tadao*
no journal, ,
no abstracts in English
Iwatsuki, Teruki
no journal, ,
Preliminary analysis on rock mechanical-hydraulic-chemical change around closure test drift was carried out to estimate groundwater recovery during re-flooding of drift. The result shows the amount of hydraulic recovery and alkalize of groundwater.
Munemoto, Takashi; Omori, Kazuaki; Hasegawa, Takashi; Kato, Toshihiro; Yuguchi, Takashi; Iwatsuki, Teruki; Hama, Katsuhiro
no journal, ,
no abstracts in English
Ishibashi, Masayuki; Kawamoto, Koji; Sasao, Eiji; Murakami, Hiroaki; Yamada, Nobuto
no journal, ,
no abstracts in English
Saegusa, Hiromitsu; Sasao, Eiji; Iwatsuki, Teruki; Sato, Toshinori; Hama, Katsuhiro
no journal, ,
no abstracts in English
Takayama, Yusuke; Sato, Toshinori; Kuwabara, Kazumichi; Sanada, Hiroyuki
no journal, ,
no abstracts in English
Yamada, Nobuto; Sasao, Eiji; Suzuki, Keiichi*; Kuboshima, Koji*; Kanazawa, Sunao*
no journal, ,
JAEA and KGE perform the joint research on cosmic ray muons applying detection of sub-surface geological structure such as fault, using the research gallery of the Mizunami Underground Research Laboratory. We set the detectors of cosmic ray muons in the underground gallery to evaluate its applicability for estimating geological structure in deep underground. We estimate the geological structure by the number of cosmic ray muons observed from November 2013 to August 2014 and confirm that we can observe the substantial number of cosmic ray muons to estimate the geological structure in the research gallery of granite at -300m underground.
Yasue, Kenichi; Asamori, Koichi
no journal, ,
no abstracts in English
Mikake, Shinichiro; Sato, Toshinori; Aoyagi, Yoshiaki
no journal, ,
The study on engineering technology in the Mizunami Underground Research Laboratory (MIU) project consists of (1) development of design and construction planning technologies, (2) development of construction technology, (3) development of countermeasure technology, (4) development of technology for security, and (5) the development of technologies for restoration and reduction of excavation damages. This reports summarized the knowledge obtained about seismic movement characteristics at deep underground and the discussions held on the grouting method as parts of the development of design and construction planning technologies, in addition, the examination held on the plug used for the Reflood test in the GL-500m Access/Research Gallery-North as a part of the development of technologies for restoration and reduction of excavation damages.
Sato, Toshinori; Aoyagi, Yoshiaki; Hirai, Kazuhide*; Sato, Hiroshi*; Sano, Tadashi*
no journal, ,
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.
Osawa, Hideaki
no journal, ,
This paper introduces the future plan of geoscientific research in Mizunami Underground Research Laboratory.
Onoe, Hironori; Beppu, Shinji; Onuki, Kenji; Kohashi, Akio; Takeuchi, Ryuji; Saegusa, Hiromitsu
no journal, ,
no abstracts in English
Nakata, Kotaro*; Hasegawa, Takuma*; Tomioka, Yuichi*; Tanaka, Yasuharu*; Hama, Katsuhiro; Iwatsuki, Teruki
no journal, ,
The technology development of groundwater dating has been carried out as a part of CRIEPI-JAEA collaboration. The carbon-14 in the organic matter dissolved in groundwater is used to estimate groundwater age. The estimated age is almost same as the age that estimated by the He-4 in groundwater. This suggested that the age estimation by carbon-14 in organic matter can be useful tool to enhance the reliability of the data on groundwater age.
Iwasaki, Riyo; Hama, Katsuhiro
no journal, ,
no abstracts in English
Fujita, Natsuko; Matsubara, Akihiro; Kokubu, Yoko; Niwa, Masakazu; Tamura, Hajimu; Shibata, Kenji; Yokoyama, Tatsunori
no journal, ,
no abstracts in English
Mikake, Shinichiro; Ikeda, Koki
no journal, ,
no abstracts in English
Tsuji, Masakuni*; Kobayashi, Shinji*; Sato, Toshinori; Mikake, Shinichiro; Johan, F.*
no journal, ,
Silica sol is a material that seems to fulfill the non-hazardous requirement of final repository and capable of penetrating into narrow fractures. The rock grouting strategy with silica sol has been studied and applied for some recent projects in Sweden. The design methodology is based on the determination of the distribution of fracture transmissivity and the theoretical penetration length. In 2008, grouting with silica sol was applied in the construction of a short tunnel at 450 m depth in the Aspo Hard Rock Laboratory, the TASS-tunnel. In 2010, a grouting experiment with silica sol was performed at a niche of 300 m depth in the Mizunami Underground Research Laboratory, the MIU-300-niche. Despite the fact that silica sol has been used for a couple of decades for soil consolidation or sealing of fractures, it has seldom been applied as a material for rock grouting during tunneling.
Yamaguchi, Yoshifumi
no journal, ,
Since the JNC's second progress report on HLW disposal, Japanese R&D program on geological disposal has been aiming to improve reliability, safety, economy and effectiveness of implementation of geological disposal in cooperation with each other organizations in accordance with national program and policy. This paper introduces the current status around the R&D on geological disposal program.