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Iijima, Kazuki
Enerugi, Shigen, 44(6), p.372 - 377, 2023/11
In the Fukushima Dai-ichi Nuclear Power Station accident, huge number of radioactive materials were released into the environment. We provided an overview of how issues have been tackled, with a focus on decontamination which was the pillar of large-scale reconstruction efforts.
Sector of Fukushima Research and Development
JAEA-Review 2020-023, 140 Pages, 2020/12
JAEA-Review-2020-023.pdf:17.22MB
The Great East Japan Earthquake on March 11, 2011, caused the accident of the Fukushima Daiichi Nuclear Power Station (1F), operated by Tokyo Electric Power Company Holdings, Ltd. Japan Atomic Energy Agency (JAEA), as a designated institution of the Basic Act on Disaster Control Measures, supported lots of activities on emergency response, environmental remediation and so on. As a unique nuclear R&D institution, JAEA conducted the Research and Development on Fukushima Daiichi Decommissioning and Environmental Restoration. This report summarizes the 10 years' JAEA activities on Fukushima Revitalization, including emergency responses just after the accident, construction on the R&D organization and infrastructures, results of R&D towards 1F decommissioning and environmental restoration and so on.
Planning and Co-ordination Office, Sector of Fukushima Research and Development
JAEA-Evaluation 2019-008, 129 Pages, 2019/12
JAEA-Evaluation-2019-008.pdf:11.63MB
The Committee evaluated the research and development programs and activities of during the period of about three years from April 2015. The Committee evaluated the research and development activities and programs based on the explanatory materials prepared by JAEA and its oral presentations with questions-and-answers sessions. This report summaries the results of the evaluation by the Committee with the Committee report.
Onoe, Hironori; Kimura, Hitoshi*
JAEA-Research 2019-001, 57 Pages, 2019/08
JAEA-Research-2019-001.pdf:10.03MB
In this study, predictive simulations were conducted in order to understand recovery behavior of groundwater environment during groundwater filling test and underground facility closure. As a result of predictive simulations of groundwater filling test, difference of groundwater environment changes around the closure test drift according to groundwater filling volume was confirmed quantitatively. As a result of the simulations, groundwater environment changes at 10 years after underground facility closure could be estimated. And, it was shown that up-corning of deep saline water through drift and shaft was occurred if hydraulic conductivity of backfill material is higher than host rock.
Iwatsuki, Teruki; Onoe, Hironori; Ishibashi, Masayuki; Ozaki, Yusuke; Wang, Y.*; Hadgu, T.*; Jove-Colon, C. F.*; Kalinina, E.*; Hokr, M.*; Balv
n, A.*; et al.
JAEA-Research 2018-018, 140 Pages, 2019/03
JAEA-Research-2018-018.pdf:40.68MB
DECOVALEX-2019 Task C aims to develop modelling and prediction methods using numerical simulation based on the water-filling experiment to examine the post drift-closure environment recovery processes. In this intermediate report, the results of Step 1 (Modelling and prediction of environmental disturbance by CTD excavation) are summarized from each of the research teams (JAEA, Sandia National Laboratories, Technical University of Liberec). Groundwater inflow rates to the tunnel during the excavation, hydraulic drawdown, and variation of chlorine concentration at monitoring boreholes in the vicinity of the tunnel were chosen as comparison metrics for Step1 by mutual agreement amongst the research teams. It is likely to be possible to foresee the scales of inflow rate and hydraulic drawdown based on a data from the pilot borehole by current simulation techniques.
Yoshizawa, Atsufumi*; Oba, Kyoko; Kitamura, Masaharu*
Ningen Kogaku, 54(3), p.124 - 134, 2018/06
Fukushima Daiichi Nuclear Power Plant caused a severe accident which released a large amount of radioactivity triggered by the Great East Japan Earthquake. The existing investigation reports of the accident prepared by several institutions pay attention only to the process which caused the accident but not much to the accident mitigation or the recovery process. This study focused on Unit 3 of Fukushima Daiichi Nuclear Power Plant, including its recovery process from the accident. Based on the public data, the time sequences for the recovery process between the accident occurrence and the state of cold shutdown were classified. Then, the groups of actions were sorted out in terms of ergonomics viewpoint. The important responses in the recovery process were identified and analyzed referring to the m-SHEL model. As a result, new lessons were learned from the accident case regarding the actions required for recovering from the accident.
Saito, Hiroshi; Nozawa, Takashi; Takemiya, Hiroshi; Seki, Akiyuki; Matsubara, Takeshi; Saito, Kimiaki; Kitamura, Akihiro
JAEA-Review 2017-040, 34 Pages, 2018/03
JAEA-Review-2017-040.pdf:9.52MB
The accidents at Fukushima Daiichi Nuclear Power Station on March 11th 2011, released significant amount of radionuclide to the environment. It has migrated to the human habitation and raised concerns of possible effect on human health, and for that a lot of researches have been performed. JAEA created and opened "Database for Radioactive Substance Monitoring Data" for usage of obtained data. For accurate modelling and future forecast using numerical code and the data, "Supporting Environment for Processing Simulation Codes" has been operated. In addition, research results have been opened as Q&A style "Knowledge Base for Environmental Remediation" in JAEA's website. The "Comprehensive Evaluation System" composed of these components, should act more interrelated and integrated as one system. Besides, information dissemination is not enough to the outside. The report summarizes the current status, remaining issues and expected improvement of each component and the system.
Okada, Takashi; Takeda, Seiji; Nakata, Hisakazu
Nihon Genshiryoku Gakkai-Shi ATOMO
, 59(10), p.603 - 607, 2017/10
Because the reclaimed material is used, quantity of disposal of the removal soil can decrease. It is a strategic key to utilize the reclaimed material. As for this report, it is explained to about the fundamentals of the safe use of the reclaimed materials derived from the removed soil.
Miyahara, Kaname; Iijima, Kazuki; Saito, Kimiaki
Jiban Kogakkai-Shi, 63(11/12), p.62 - 69, 2015/11
This review provides a concise overview of knowledge and experience gained from the activities for environmental remediation after the Fukushima Dai-ichi accident as input for developing a technical knowledge base including remediation technologies which is translated into actions that enable the rapid return of evacuees. It is reflecting JAEA's key role in the research associated with both remediation of contaminated areas and the natural processes influencing contamination migration in non-remediated areas, working together with a number of Japanese and international organisations and research institutes. This review also provides a perspective on the future actions required to remediate areas outside the Fukushima Dai-ichi site.
Hata, Kuniki; Urushibara, Ayumi*; Yamashita, Shinichi*; Lin, M.*; Muroya, Yusa*; Shikazono, Naoya; Yokoya, Akinari; Fu, H.*; Katsumura, Yosuke*
Journal of Radiation Research, 56(1), p.59 - 66, 2015/01
Times Cited Count：6 Percentile：29.71(Biology)Yoshida, Maiko; Kobayashi, Shinji*; Urano, Hajime; Oyama, Naoyuki; Koide, Yoshihiko; Sakamoto, Yoshiteru; Takenaga, Hidenobu; Kamada, Yutaka; JT-60 Team
Plasma Physics and Controlled Fusion, 48(5A), p.A209 - A215, 2006/05
Times Cited Count：11 Percentile：37.01(Physics, Fluids & Plasmas)no abstracts in English
/p-AlInGaP solar cellsLee, H. S.*; Yamaguchi, Masafumi*; Ekins-Daukes, N. J.*; Khan, A.*; Takamoto, Tatsuya*; Imaizumi, Mitsuru*; Oshima, Takeshi; Ito, Hisayoshi
Physica B; Condensed Matter, 376-377, p.564 - 567, 2006/04
Times Cited Count：2 Percentile：12.58(Physics, Condensed Matter)no abstracts in English
Oshima, Takeshi; Sumita, Taishi*; Imaizumi, Mitsuru*; Kawakita, Shiro*; Shimazaki, Kazunori*; Kuwajima, Saburo*; Oi, Akihiko*; Ito, Hisayoshi
Proceedings of 31st IEEE Photovoltaic Specialists Conference and Exhibition (PVSC-31), p.806 - 809, 2005/00
no abstracts in English
thin-film solar cells for space useKawakita, Shiro*; Shimazaki, Kazunori*; Imaizumi, Mitsuru*; Kuwajima, Saburo*; Yoda, Shinichi*; Oshima, Takeshi; Ito, Hisayoshi
Proceedings of the 6th International Workshop on Radiation Effects on Semiconductor Devices for Space Application (RASEDA-6), p.151 - 154, 2004/10
no abstracts in English
Oyama, Hidenori*; Takakura, Kenichiro*; Nakabayashi, Masakazu*; Hirao, Toshio; Onoda, Shinobu; Kamiya, Tomihiro; Simoen, E.*; Claeys, C.*; Kuboyama, Satoshi*; Oka, Katsumi*; et al.
Nuclear Instruments and Methods in Physics Research B, 219-220, p.718 - 721, 2004/06
Times Cited Count：3 Percentile：24.89(Instruments & Instrumentation)no abstracts in English
Kawakita, Shiro*; Imaizumi, Mitsuru*; Sumita, Taishi*; Kushiya, Katsumi*; Oshima, Takeshi; Yamaguchi, Masafumi*; Matsuda, Sumio*; Yoda, Shinichi*; Kamiya, Tomihiro
Proceedings of 3rd World Conference on Photovoltaic Energy Conversion (WCPEC-3) (CD-ROM), 4 Pages, 2004/01
The electrical performance of Cu(Ga,In)Se solar cells on MDS-1 which was launched in February 2002 was measured. The CIGS solar cells show superior radiation resistance in space. The short circuit current dose not degrade and the open circuit voltage shows only 1 % degradation after 200 days. On the other hand, in the case of ground test, the recovery of electrical performance of CIGS solar cells are observed at RT. And, the recovery is enhanced by current-injection.
thin-film solar cellsKawakita, Shiro*; Imaizumi, Mitsuru*; Yamaguchi, Masafumi*; Kushiya, Katsumi*; Oshima, Takeshi; Ito, Hisayoshi; Matsuda, Sumio*
Japanese Journal of Applied Physics, Part 2, 41(7A), p.L797 - L799, 2002/07
Recovery of electrical characteristics of Cu(In,Ga)Se irradiated with protons was studied. A proton irradiation chamber which has a AM0 solar light was used for in-situ measurement in this study. The electrical characteristics of irradiated samples which were kept under a dark condition recovered. Furthermore,this recovery effect was enhanced by light illumination. The activation energy for the recovery was estimated to be 0.80 eV (light illumination case) and 0.92 eV (dark condition case).
Chimi, Yasuhiro; Iwase, Akihiro; Ishikawa, Norito; Kobiyama, Mamoru*; Inami, Takashi*; Okuda, S.*
Journal of Nuclear Materials, 297(3), p.355 - 357, 2001/09
Times Cited Count：217 Percentile：98.84(Materials Science, Multidisciplinary)no abstracts in English
Hoshiya, Taiji
Kagaku To Kogyo, 75(8), p.379 - 387, 2001/08
no abstracts in English
Tsuchiya, Yoshinori; Kikuchi, Kenji; Minakawa, Nobuaki; Morii, Yukio; Kato, Takashi; Nakajima, Hideo; Tsuji, Hiroshi
Nihon Zairyo Gakkai Dai-49-Ki Gakujutsu Koenkai Rombunshu, p.325 - 326, 2000/05
no abstracts in English
