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Onoe, Hironori; Ishibashi, Masayuki*; Ozaki, Yusuke; Iwatsuki, Teruki
International Journal of Rock Mechanics and Mining Sciences, 144, p.104737_1 - 104737_14, 2021/08
Times Cited Count：4 Percentile：43.25(Engineering, Geological)In this study, we investigated the methodology of modeling for fractured granite around the drift at a depth of 500 m in the Mizunami Underground Laboratory, Japan as a case study. As a result, we developed the fracture modeling method to estimate not only geological parameters of fractures but also hydraulic parameters based on the reproducibility of trace length distribution of fractures. By applying this modeling method, it was possible to construct a Discrete Fracture Network (DFN) model that can accurately reproduce the statistical characteristics of fractures.
Hama, Katsuhiro
Proceedings of 6th East Asia Forum on Radwaste Management Conference (EAFORM 2017) (Internet), 6 Pages, 2017/12
The Mizunami Underground Research Laboratory project is being pursued by the JAEA in the crystalline host rock at Mizunami City in Gifu Prefecture. The project proceeds in three overlapping phases, Surface-based investigation Phase (Phase I), Construction Phase (Phase II) and Operation Phase (III). During Phase I, a step-wise investigation was conducted by iterating investigation, interpretation, and assessment, thereby understanding of geologic environment was progressively and effectively improved with progress of investigation. During Phase II, we have evaluated adequacy of techniques for investigation, analysis and assessment of the deep geological environment established in the Phase I. For Phase III, three important issues were identified based on the latest results. Development of countermeasure technologies for reducing groundwater inflow, Development of modeling technologies for mass transport, Development of drift backfilling technologies.
Kotake, Shoji*; Chikazawa, Yoshitaka; Takaya, Shigeru; Otaka, Masahiko; Kubo, Shigenobu; Arai, Masanobu; Kunogi, Kosuke; Ito, Takaya*; Yamaguchi, Akira*
Proceedings of 2017 International Congress on Advances in Nuclear Power Plants (ICAPP 2017) (CD-ROM), 6 Pages, 2017/04
A maintenance management required to prototype nuclear power reactors is proposed. Monitoring and control of sodium impurity and thermal transient are extremely important for sodium boundary maintenance for sodium-cooled fast reactors. At the fast stage of the prototype reactor Monju operation, degradation mechanism on the piping should be demonstrated based on operation experiences. Therefore inspection on a representative position for crack indication and pipe thickness is proposed. Due to less experience of SFR plants, early detection of boundary failure is considered. For a matured operation stage, when degradation mechanism is well demonstrated based on inspection data, inspection cycle could be extended. And for commercial reactors, maintenance without inspection will be established based on accumulated operation experiences including those of the prototype reactor Monju.
Sato, Toshinori; Sasamoto, Hiroshi; Ishii, Eiichi; Matsuoka, Toshiyuki; Hayano, Akira; Miyakawa, Kazuya; Fujita, Tomoo*; Tanai, Kenji; Nakayama, Masashi; Takeda, Masaki; et al.
JAEA-Research 2016-025, 313 Pages, 2017/03
JAEA-Research-2016-025.pdf:45.1MB
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. This report summarizes the results of the Phase II investigations carried out from April 2005 to June 2014 to a depth of 350m. Integration of work from different disciplines into a "geosynthesis" ensures that the Phase II goals have been successfully achieved and identifies key issues that need to made to be addressed in the Phase II investigations Efforts are made to summarize as many lessons learnt from the Phase II investigations and other technical achievements as possible to form a "knowledge base" that will reinforce the technical basis for both implementation and the formulation of safety regulations.
Shibata, Masahiro; Sawada, Atsushi; Tachi, Yukio; Makino, Hitoshi; Wakasugi, Keiichiro; Mitsui, Seiichiro; Kitamura, Akira; Yoshikawa, Hideki; Oda, Chie; Ishidera, Takamitsu; et al.
JAEA-Research 2014-030, 457 Pages, 2015/03
JAEA-Research-2014-030.pdf:199.23MB
JAEA and NUMO have conducted a collaborative research work which is designed to enhance the methodology of repository design and post-closure performance assessment in preliminary investigation stage. With regard to (1) study on rock suitability in terms of hydrology, based on some examples of developing method of hydro-geological structure model, acquired knowledge are arranged using the tree diagram, and model uncertainty and its influence on the evaluation items were discussed. With regard to (2) study on scenario development, the developed approach for "defining conditions" has been reevaluated and improved from practical viewpoints. In addition, the uncertainty evaluation for the effect of use of cementitious material, as well as glass dissolution model, was conducted with analytical evaluation. With regard to (3) study on setting radionuclide migration parameters, based on survey of precedent procedures, multiple-approach for distribution coefficient of rocks was established, and the adequacy of the approach was confirmed though its application to sedimentary rock and granitic rock. Besides, an approach for solubility setting was developed including the procedure of selection of solubility limiting solid phase. The adequacy of the approach was confirmed though its application to key radionuclides.
Kawamoto, Koji; Kuboshima, Koji*; Murakami, Hiroaki; Ishibashi, Masayuki; Sasao, Eiji
JAEA-Research 2014-021, 30 Pages, 2014/11
JAEA-Research-2014-021.pdf:6.79MB
The MIU (Mizunami Underground Research Laboratory) Project has three overlapping phases, Surface-based investigation phase (Phase I), Construction phase (Phase II), and Operation phase (Phase III). Currently, the project is under Phase II and Phase III. One of Phase II goals is set up to develop and revise models of the geological environment using the investigation results obtained during excavation, and to determine and assess changes in the geological environment in response to excavation. This report aims at compiling results of study on geology and geological structure at the -500m Stage in the MIU construction site, investigated in the Phase II and provides the fundamental information on the geology and geological structure for future study and modeling of geological environment.
Kusama, Yoshinori
Purazuma Shindan No Kiso To Oyo, p.195 - 205, 2006/03
no abstracts in English
Nagami, Masayuki; Inoue, Nobuyuki
Fusion Science and Technology, 42(1), p.1 - 6, 2002/07
The present fusion program of Japan is based on the Third Phase Basic Program of Fusion Research and Development, determined by the Japan Atomic Energy Commission in 1992. The Program describes Fusion Plasma Technology, Reactor Technology, Safety and Fusion Reactor System as the subject areas. The present research activity is now undertaken based on the subject areas. This paper describes The Third Phase Basic Program and the overview of the relevant present research status.
Takeuchi, Motoyoshi; Nakajima, Katsutoshi; Fukumura, Nobuo*; Nakayama, Fusao*; Ohori, Hideshi*
Dekomisshoningu Giho, (24), p.27 - 46, 2001/09
no abstracts in English
Iwai, Yasunori; Yamanishi, Toshihiko; Nishi, Masataka
Fusion Technology, 39(2-Part2), p.1078 - 1082, 2001/03
no abstracts in English
Oikawa, Toshihiro; Ushigusa, Kenkichi; Forest, C. B.*; Nemoto, Masahiro; Naito, Osamu; Kusama, Yoshinori; Kamada, Yutaka; Tobita, Kenji; Suzuki, Shingo*; Fujita, Takaaki; et al.
Nuclear Fusion, 40(3Y), p.435 - 443, 2000/03
Times Cited Count：41 Percentile：74.95(Physics, Fluids & Plasmas)no abstracts in English
Iwai, Yasunori; Yamanishi, Toshihiko; Nishi, Masataka
JAERI-Tech 2000-002, p.37 - 0, 2000/02
JAERI-Tech-2000-002.pdf:1.49MB
no abstracts in English
Nakagawa, Tsuneo; *; Sugi, Teruo*; *
JAERI-Data/Code 99-031, 78 Pages, 1999/06
JAERI-Data-Code-99-031.pdf:2.63MB
no abstracts in English
Oikawa, Toshihiro; Ushigusa, Kenkichi; Forest, C. B.*; Nemoto, Masahiro; Naito, Osamu; Kusama, Yoshinori; Kamada, Yutaka; Tobita, Kenji; Suzuki, Shingo*; Fujita, Takaaki; et al.
Fusion Energy 1998, Vol.2, p.551 - 558, 1998/10
no abstracts in English
Suzuki, Shingo*; Shirai, Toshizo; Nemoto, Masahiro; Tobita, Kenji; Kubo, Hirotaka; Sugie, Tatsuo; Sakasai, Akira; Kusama, Yoshinori
Plasma Physics and Controlled Fusion, 40(12), p.2097 - 2111, 1998/00
Times Cited Count：61 Percentile：85.59(Physics, Fluids & Plasmas)no abstracts in English
Naito, Osamu; Oikawa, Toshihiro; Ushigusa, Kenkichi; Nemoto, Masahiro; Tobita, Kenji; Ide, Shunsuke; Kuriyama, Masaaki; Kamada, Yutaka; Kusama, Yoshinori
Proc. of 1998 ICPP & 25th EPS Conf. on Contr. Fusion and Plasma Physics, 22C, p.1182 - 1185, 1998/00
no abstracts in English
Nemoto, Masahiro; Tobita, Kenji; Ushigusa, Kenkichi; Kusama, Yoshinori; Kuriyama, Masaaki; ; Masaki, Kei; Sakasai, Akira; Kamada, Yutaka
Purazuma, Kaku Yugo Gakkai-Shi, 73(12), p.1374 - 1377, 1997/12
no abstracts in English
Kikuchi, Mitsuru; ; ; Miya, Naoyuki; Ushigusa, Kenkichi; Nagashima, Keisuke; Aoyagi, Tetsuo; ; Neyatani, Yuzuru; Naito, Osamu; et al.
JAERI-Research 97-026, 70 Pages, 1997/03
JAERI-Research-97-026.pdf:3.23MB
no abstracts in English
Yamanishi, Toshihiko; Iwai, Yasunori; Okuno, Kenji
JAERI-Research 95-058, 22 Pages, 1995/09
JAERI-Research-95-058.pdf:0.69MB
no abstracts in English
