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Shimomura, Yusuke; Sato, Takuya; Fukui, Yasutaka; Kudo, Kenji; Yoshioka, Tatsuji
JAEA-Review 2018-023, 220 Pages, 2019/01
JAEA-Review-2018-023.pdf:15.6MB
On September 11, 2015, leaky traces of bituminized wastes were confirmed from four drums filled with bituminization in waste packages storage yard (II) of waste management facility in Oarai Research and Development Center. Moreover, even after the subsequent investigation, a leakage trace was found from one bituminous drum on November 10, 2015. Furthermore, on December 2, 2015, there was no a leakage trace in one bituminous drum, however the upper lid was found to be intensely corroded. To investigate the causes and the countermeasures for leakages of bituminized wastes from the drums, we have set up a Work Group to investigate the causes and the countermeasures to leakage traces from the drums. This report is based on "Report on Cause Investigation and Countermeasure of Leakage Trace from the Drum" summarized by this working group, the report was reconstructed including the contents clarified in the subsequent document investigation.
Hama, Katsuhiro; Sasao, Eiji; Iwatsuki, Teruki; Onoe, Hironori; Sato, Toshinori; Fujita, Tomoo; Sasamoto, Hiroshi; Matsuoka, Toshiyuki; Takeda, Masaki; Aoyagi, Kazuhei; et al.
JAEA-Review 2016-014, 274 Pages, 2016/08
JAEA-Review-2016-014.pdf:44.45MB
We synthesized the research results from the Mizunami/Horonobe Underground Research Laboratories (URLs) and geo-stability projects in the second midterm research phase. This report can be used as a technical basis for the Nuclear Waste Management Organization of Japan/Regulator at each decision point from siting to beginning of disposal (Principal Investigation to Detailed Investigation Phase).
Hama, Katsuhiro; Mizuno, Takashi; Sasao, Eiji; Iwatsuki, Teruki; Saegusa, Hiromitsu; Sato, Toshinori; Fujita, Tomoo; Sasamoto, Hiroshi; Matsuoka, Toshiyuki; Yokota, Hideharu; et al.
JAEA-Research 2015-007, 269 Pages, 2015/08
JAEA-Research-2015-007.pdf:68.65MBJAEA-Research-2015-007(errata).pdf:0.07MB
We have synthesised the research results from Mizunami/Horonobe URLs and geo-stability projects in the second mid-term research phase. It could be used as technical bases for NUMO/Regulator in each decision point from sitting to beginning of disposal (Principal Investigation to Detailed Investigation Phase). High quality construction techniques and field investigation methods have been developed and implemented and these will be directly applicable to the National Disposal Program (along with general assessments of hazardous natural events and processes). It will be crucial to acquire technical knowledge on decisions of partial backfilling and final closure by actual field experiments in Mizunami/Horonobe URLs as main themes for the next phases.
Sato, Haruo; Niizato, Tadafumi; Amano, Kenji; Tanaka, Shingo; Aoki, Kazuhiro
Materials Research Society Symposium Proceedings, Vol.1518, p.277 - 282, 2013/10
The accident of the TEPCO Fukushima Dai-ichi Nuclear Power Plant occurred by the 2011 off the Pacific coast of Tohoku Earthquake on 11 March, 2011. It is estimated that 1.2-1.5
10
Bq for 
Cs and 1.5-1.610
Bq for I-131 were released until the beginning of April and those radionuclides (RN) were deposited on soil surface and forest etc. widely around Fukushima Pref. This work was carried out as one of the investigations for making the distribution maps of radiation dose rate and soil contaminated by RNs which the MEXT promotes. The Geoslicer investigation on the depth distribution of RNs in soil was carried out after 3 months from the accident. The investigation was conducted at 11 locations in Nihonmatsu City, Kawamata Town and Namie Town, and soil samples of depth 50 cm to 1 m were taken. Both of 
Cs and Cs were detected in all investigated locations, and 
Te and 
Ag were detected only in areas where radiation dose rates are high. At many locations investigated, radiocaesium more than 99% distributed within a depth of 10 cm in soil in the surface layer. On the other hand, RNs tended to distribute to deeper part in soil at locations that are supposed to have been used as farmland than in soil in the surface layer, and radiocaesium more than 99% in soil at locations that are supposed to have been used as farmland also distributed within a depth of around 14 cm. The apparent diffusion coefficients of RNs derived from penetration profiles near the surface layer showed a tendency to be higher in soil at locations that are supposed to have been used as farmland than in soil in the surface layer. The distribution coefficients by a batch method were also obtained for Cs and I, and the relationship between D
and K
was discussed.
Iwatsuki, Teruki; Sato, Haruo; Nohara, Tsuyoshi; Tanai, Kenji; Sugita, Yutaka; Amano, Kenji; Yabuuchi, Satoshi; Oyama, Takuya; Amano, Yuki; Yokota, Hideharu; et al.
JAEA-Research 2011-009, 73 Pages, 2011/06
JAEA-Research-2011-009.pdf:4.41MB
The research and development plan in Horonobe Underground Research Laboratory are summarized according to the 2nd Midterm Plan till 2014 fiscal year of JAEA. In this midterm, galleries and the infrastructures for the research and development up to the depth of 350 m are constructed by Private Financial Initiative (PFI). Additionally Phase 3: Operation phase at the galleries begins in parallel to Phase 2: Construction phase. In these phases various research and development including collaboration with other institutes are conducted at the galleries. Generallic applicable techniques on the subject of the investigation of geological environment, facility construction in deep underground and the reliability of geological deposal are developed during the phase. The feasibility and reliance of various technologies concerning geological disposal is demonstrated by widely opening the outcome to the public in the society.
Hanakawa, Hiroki; Sato, Shinichi; Kusunoki, Hidehiko; Fukasaku, Akitomi; Tobita, Kenji
JAEA-Review 2009-044, 24 Pages, 2010/01
JAEA-Review-2009-044.pdf:5.96MB
Electric power supply system of JMTR consists of commercial power supply system and emergency power supply system. In the periodical assessment of JMTR, it was concluded that the integrity of the emergency generators were confirmed and the aging effects were to be watching continuously in future. Therefore, prior to the restart of the JMTR, verification on integrity of the generators were carried out in order to confirm the integrity and to determine maintenance plans which run before and after the restart. As a result, the integrity of the generators were confirmed because the electrical degradation was not found. Maintenance plan is determined before JMTR restart. Also it is possible to maintain the integrity of the generators by carrying on the current maintenance plan with periodical overhaul.
Ebisawa, Hiroyuki; Hanakawa, Hiroki; Asano, Norikazu; Kusunoki, Hidehiko; Yanai, Tomohiro; Sato, Shinichi; Miyauchi, Masaru; Oto, Tsutomu; Kimura, Tadashi; Kawamata, Takanori; et al.
JAEA-Technology 2009-030, 165 Pages, 2009/07
JAEA-Technology-2009-030.pdf:69.18MB
The condition of facilities and machinery used continuously were investigated before the renewal work of JMTR on FY 2007. The subjects of investigation were reactor building, primary cooling system tanks, secondary cooling system piping and tower, emergency generator and so on. As the result, it was confirmed that some facilities and machinery were necessary to repair and others were used continuously for long term by maintaining on the long-term maintenance plan. JMTR is planed to renew by the result of this investigation.
Nishio, Kazuhisa; Mizuno, Takashi; Oyama, Takuya; Nakama, Shigeo; Saegusa, Hiromitsu; Takeuchi, Ryuji; Amano, Kenji; Tsuruta, Tadahiko; Hama, Katsuhiro; Iyatomi, Yosuke; et al.
JAEA-Review 2007-038, 31 Pages, 2007/12
JAEA-Review-2007-038.pdf:11.5MB
Japan Atomic Energy Agency (JAEA) at Tono Geoscience Center (TGC) is developing a geoscientific research project named Mizunami Underground Research Laboratory (MIU) in crystalline rock environment in order to establish scientific and technological basis for geological disposal of HLW. Geoscientific research at MIU is planned to be carried out in three Phases over a period of 20 years; Surface-based Investigation Phase (Phase 1), Construction Phase (Phase 2) and Operation Phase (Phase 3). Currently, the Project is under the Construction Phase. This document presents the following 2007 fiscal year plan of the Construction Phase based on the MIU Master Plan updated in 2002, (1)Investigation Plan at the MIU Construction Site, (2)Construction Plan at the MIU Construction Site, (3)Research Collaboration Plan.
Nishio, Kazuhisa; Mizuno, Takashi; Oyama, Takuya; Nakama, Shigeo; Saegusa, Hiromitsu; Takeuchi, Ryuji; Amano, Kenji; Tsuruta, Tadahiko; Hama, Katsuhiro; Iyatomi, Yosuke; et al.
JAEA-Review 2007-037, 29 Pages, 2007/12
JAEA-Review-2007-037.pdf:13.06MB
Japan Atomic Energy Agency (JAEA) at Tono Geoscience Center (TGC) is developing a geoscientific research project named Mizunami Underground Research Laboratory (MIU) in crystalline rock environment in order to establish scientific and technological basis for geological disposal of HLW. Geoscientific research at MIU is planned to be carried out in three Phases over a period of 20 years; Surface-based Investigation Phase (Phase 1), Construction Phase (Phase 2) and Operation Phase (Phase 3). Currently, the Project is under the Construction Phase. This document presents the following 2006 fiscal year plan of the Construction Phase based on the MIU Master Plan updated in 2002, (1)Investigation Plan at the MIU Construction Site, (2)Construction Plan at the MIU Construction Site, (3)Research Collaboration Plan.
Saegusa, Hiromitsu; Seno, Yasuhiro; Nakama, Shigeo; Tsuruta, Tadahiko; Iwatsuki, Teruki; Amano, Kenji; Takeuchi, Ryuji; Matsuoka, Toshiyuki; Onoe, Hironori; Mizuno, Takashi; et al.
JAEA-Research 2007-043, 337 Pages, 2007/03
JAEA-Research-2007-043.pdf:28.14MB
The Mizunami Underground Laboratory (MIU) Project is a comprehensive research project investigating the deep underground environment within crystalline rock being conducted by Japan Atomic Energy Agency at Mizunami City in Gifu Prefecture, central Japan. This report summarizes the results of the Surface-based Investigation Phase, identifies future issues and provides direction for research to be conducted during Construction Phase and Operation Phase. The results compiled in this report will be utilized for the technical knowledge base on geological disposal of HLW, and can be used to enhance the technical basis for waste disposal in general and for development of government regulations.
Miyake, Yasuhiro*; Nishiyama, Kusuo*; Kawamura, Naritoshi*; Makimura, Shunsuke*; Strasser, P.*; Shimomura, Koichiro*; Beveridge, J. L.*; Kadono, Ryosuke*; Fukuchi, Koichi*; Sato, Nobuhiko*; et al.
Physica B; Condensed Matter, 374-375, p.484 - 487, 2006/03
Times Cited Count：6 Percentile：31.27(Physics, Condensed Matter)The construction of the Materials and Life Science building was started in the beginning of the fiscal year of 2004. After commissioning of the accelerator and beam transport sections in 2008, muon beams will be available for users in 2009. In this letter, the latest construction status of the J-PARC Muon Science Facility is reported.
Ota, Kunio; Sato, Toshinori; Takeuchi, Shinji; Iwatsuki, Teruki; Amano, Kenji; Saegusa, Hiromitsu; Matsuoka, Toshiyuki; Onoe, Hironori
JNC TN7400 2005-023, 373 Pages, 2005/09
Techniques for characterising the deep geological environment in a rational and effective manner have been established through the surface-based investigations of the crystalline basement with sedimentary overburden at the Tono area, which can particularly address the key aspects to be answered for safety assessment, the construction of underground facility and environmental impact assessment. The surface-based investigations have been carried out at several scales, regional, local, site and block, by taking an iterative approach through which the depth of understanding and the degree of uncertainty can be evaluated and the next investigation issues prioritised. The link between field investigations and the key aspects through interpretation, conceptualisation and modelling processes within the iterative approach can eventually be illustrated as a "Geosynthesis Flow" diagram at each exploration step. In addition, a technical basis for preliminary investigations has been developed. The rationale for the investigation, interpretation, conceptualisation and modelling processes and the technical expertise gained through the processes as well as the improvement of investigation and modelling techniques can be described in detail.
Watanabe, Tadashi; Amano, Kenji; Ikeda, Koki; Iwatsuki, Teruki; Saegusa, Hiromitsu; Sato, Toshinori; Takeuchi, Shinji
JNC TN7400 2005-027, 161 Pages, 2005/08
JNC-TN7400-2005-027.pdf:44.12MB
The current geoscientific research of the Mizunami Underground Research Laboratory (MIU) Project have been carried out since the 1996 fiscal year at the Shobasama Site in Akeyo-cho, Mizunami City, Gifu Prefecture. The main goals of MIU Project are to establish appropriate methodologies for reliably investigation and assessing a deep subsurface, and to develop a range of engineering techniques for deep underground application in granite. The surface-based investigations at city-owned land (MIU Construction Site) have started since the 2001 fiscal year. In 2004 fiscal year, deep borehole (MIZ-1) investigations were continued in the MIU Construction Site. After completion of the borehole drilling, Geophysical survey, Rock mechanical test, Groundwater pumping test and Installation of long-term monitoring system were excused. In addition to there groundwater monitoring was carried out using shallow boreholes. Based on these investigations and research, a geological environmental model in/around the MIU Construction Site was constructed to understand the state of the geological environment before shaft sinking. Investigations of Construction Phase, Geological mapping, Reverse vertical seismic profiling, Inflow measurement of groundwater, Analysis of groundwater and Research of the engineering were commenced in/around the MIU Construction Site from 2004 fiscal year. In addition to a research on the engineering technology was continued. In Shobasama site, the hydraulic pressure monitoring and surface hydraulic observation were continued.
Hiroyuki, Mochida; Ota, Kunio; Kenji, Amano; Saegusa, Hiromitsu; Sato, Toshinori; Iwatsuki, Teruki; Tsuruta, Tadahiko
JNC TN7410 2005-001, 32 Pages, 2005/05
JNC-TN7410-2005-001.pdf:7.06MB
None
Nakama, Shigeo; Takeuchi, Shinji; Amano, Kenji; Saegusa, Hiromitsu; Iwatsuki, Teruki; Sato, Toshinori; Ikeda, Koki; Yabuuchi, Satoshi; Koide, Kaoru
JNC TN7400 2005-002, 90 Pages, 2004/12
JNC-TN7400-2005-002.pdf:11.41MB
None
Nakano, Katsushi; Amano, Kenji; Takeuchi, Shinji; Ikeda, Koki; Saegusa, Hiromitsu; Hama, Katsuhiro; Kumazaki, Naoki; Iwatsuki, Teruki; Yabuuchi, Satoshi; Sato, Toshinori
JNC TN7400 2002-008, 77 Pages, 2003/03
; Amano, Kenji; Saegusa, Hiromitsu; Sato, Toshinori; Takeuchi, Shinji; Nakama, Shigeo; Hama, Katsuhiro
JNC TN7400 2002-004, 90 Pages, 2002/08
JNC-TN7400-2002-004.pdf:2.25MB
The current geoscientific research of the Mizunami Underground Research Laboratory (MIU) Project have been carried out since the 1996 fiscal year at the Shobasama site in Akeyo-cho, Mizunami City, Gifu Prefecture. The main goals of the MIU Project are to establish appropriate methodologies for reliably investigating and assessing the deep subsurface, and to develop a range of engineering techniques for deep underground application in granite. The site for MIU construction was changed in January 2002, from the Shobasama site to city-owned land (MIU facility site) after lease contract with Mizunami city. The surface-based investigations at the MIU facility site have started since February 2002. The conceptual modeling work around the MIU facility site has started based on the information from the previous investigations of the Regional Hydrogeological Study and MIU project. Based on the conceptual model, the planning of geophysical survey and shallow borehole investigations has started. These investigations will be done in 2002 fiscal year. Hydrogeological modeling and groundwater flow analysis were performed in the study area (about 46 km around the Shobasama site). The preliminary analysis based on the rock mechanical model at the Shobasama site was performed to understand the behavior of deformation caused by the construction of shafts.
Osawa, Hideaki; Nakano, Katsushi; Takeuchi, Shinji; Hama, Katsuhiro; Amano, Kenji; Sato, Toshinori;
JNC TN7410 2002-005, 38 Pages, 2002/07
Kato, Shigeru*; Yoshimuta, Shigeharu*; Hasumi, Takashi*; Sato, Kenji*; Sawa, Kazuhiro; Suzuki, Shuichi*; Mogi, Haruyoshi; Shiozawa, Shusaku; Tanaka, Toshiyuki
FAPIG, (154), p.47 - 51, 2000/03
no abstracts in English
Sato, Haruo; ; Shibutani, Tomoki; Yui, Mikazu; ;
Nuclear Technology, 127(2), p.199 - 211, 1999/08
Times Cited Count：28 Percentile：86.64(Nuclear Science & Technology)None
