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Journal Articles

Characterization study of four candidate technologies for nuclear material quantification in fuel debris at Fukushima Daiichi Nuclear Power Station

Nagatani, Taketeru; Komeda, Masao; Shiba, Tomooki; Nauchi, Yasushi*; Maeda, Makoto; Sagara, Hiroshi*; Kosuge, Yoshihiro*; Kureta, Masatoshi; Tomikawa, Hirofumi; Okumura, Keisuke; et al.

Energy Procedia, 131, p.258 - 263, 2017/12

 Percentile:100

Journal Articles

Characterization study of four candidate technologies for nuclear material quantification in fuel debris at Fukushima Daiichi Nuclear Power Station (Interim report)

Nagatani, Taketeru; Komeda, Masao; Shiba, Tomooki; Maeda, Makoto; Nauchi, Yasushi*; Sagara, Hiroshi*; Kosuge, Yoshihiro*; Kureta, Masatoshi; Tomikawa, Hirofumi; Okumura, Keisuke; et al.

Proceedings of INMM 57th Annual Meeting (Internet), 10 Pages, 2016/07

Journal Articles

Accounting for and control of nuclear fuel materials in molten fuels at Fukushima Daiichi Nuclear Power Plants

Hori, Keiichiro

Kaku Busshitsu Kanri Senta Nyusu, 42(8), p.4 - 7, 2013/08

Explanation of development plan of nuclear material accountancy technology for molten fuel at Fukushima Daiichi Nuclear Power Plants and activities in JAEA.

Journal Articles

Report of the meeting on "Assurances of supply and non-proliferation"

Kobayashi, Naoki; Hori, Keiichiro; Kuribayashi, Toshihiro

Genshiryoku eye, 52(12), p.16 - 21, 2006/12

no abstracts in English

Journal Articles

Transparency of peaceful use of nuclear energy in East Asia

Inoue, Naoko; Hori, Keiichiro; Dosho, Hisaharu; Ota, Kiyokazu*; Otsuka, Naoto; Aso, Ryoji; Senzaki, Masao

Proceedings of INMM 47th Annual Meeting (CD-ROM), 6 Pages, 2006/00

no abstracts in English

Journal Articles

Evaluation of Japanese cooperation to safeguards implementation as one of best practices in terms of openness and transparency

Kurasaki, Takaaki*; Dosho, Hisaharu; Ota, Kiyokazu*; Hori, Keiichiro; Kuribayashi, Toshihiro; Otsuka, Naoto

Proceedings of INMM 47th Annual Meeting (CD-ROM), 8 Pages, 2006/00

no abstracts in English

Oral presentation

Transparency of nuclear fields in Asia

Hori, Keiichiro

no journal, , 

In the East Asia region, only three countries and one region use nuclear power generation. Nuclear power generation is expected to expand in this region with the growth of economy. For the future peaceful use of nuclear energy, nuclear non-proliferation culture should be fostered with confidence building through the transparency of peaceful nuclear activity between the each country in this region. This study will describe the measures that can contribute to the improvement of the transparency of peaceful nuclear activity in the aspect of non-proliferation in this region.

Oral presentation

Passive $$gamma$$ spectrometry of low-volatile FPs for accountancy of special nuclear material in molten core material of Fukushima Daiichi Nuclear Power Plant; Numerical simulation of leakage $$gamma$$-ray from molten core materials in hypothetical canister

Sagara, Hiroshi*; Shiba, Tomooki*; Tomikawa, Hirofumi; Ishimi, Akihiro; Hori, Keiichiro; Saito, Masaki*

no journal, , 

For the nuclear material accountancy of molten core material in Fukushima Daiichi Unit 1, 2 and 3 (1F1, 1F2 and 1F3), feasibility studies of variety of technologies are being performed. As one of the technologies, feasibility study of passive $$gamma$$ spectroscopy of low-volatile FPs for nuclear material accountancy in molten core material has been performed with reviewing TMI-2 experience, and the correlation of actinides and FPs inventory in core of 1F1, 1F2 and 1F3, considering the sensitivity of axial neutron spectrum, void, burnup, enrichment distribution unique to BWR fuel, and also leakage $$gamma$$-ray from molten core materials sphere model. In the present paper, numerical simulation of leakage $$gamma$$-ray from molten core materials in hypothetical canister is dealt for determination of radioactivity of low-volatile high-energy emission FPs, which could be utilized for nuclear material quantity estimation.

Oral presentation

The Status of the Japanese project on material accountancy of fuel debris and U.S.-Japan cooperation on survey of technologies for nuclear material accountancy at Fukushima Daiichi Nuclear Power Plant

Hori, Keiichiro; Heinberg, C.; Conner, J.*; Browne, M.*; Colin, C.*

no journal, , 

At the time of accident, about 270 tons of fuel were in Units 1- 3 at Fukushima Daiichi Nuclear Power Station. Up to that time, material accountancy was implemented as an item facility for adequate material control and for the International Atomic Energy Agency's safeguards verification. Fuel debris contains nuclear fuel materials, fission products and structural materials, etc. Fuel debris will need to be controlled adequately after removal from the reactors, but material accountancy measures as an item facility no longer can be applied because of meltdown of the fuel. Development of measurement technologies for fuel debris may be required for adequate material control and accountancy of special nuclear material in the fuel debris at Fukushima Daiichi. Japan Atomic Energy Agency (JAEA) and United States Department of Energy/National Nuclear Security Administration (DOE/NNSA) have agreed to collaborate to investigate past experience on material control at severe accidents involving reactor core fuels and potential measurement technologies for fuel debris measurement. Besides DOE/NNSA and JAEA, Japanese Government, Tokyo Electric Power Company (TEPCO), Central Research Institute of Electric Power Industry (CRIEPI) and the U.S. National Laboratories have been collaborating in this effort. This paper describes the purpose, objectives, structure and process of this collaboration.

Oral presentation

Recommendations for measurement systems for nuclear material accountancy of Fukushima Daiichi fuel debris; $$gamma$$ technologies

Tomikawa, Hirofumi; Heinberg, C.; Nauchi, Yasushi*; Vo, D.*; Carroll, C.*; Hori, Keiichiro

no journal, , 

In order to survey technologies to be developed for nuclear material quantification of fuel debris at 1F, Japan Atomic Energy Agency (JAEA) and United States Department of Energy (DOE) started collaborative research from November 2012. Under the collaborative research, three Working Groups, Neutron Working Group (NWG), Gamma Working Group (GWG) and Source Term Working Group (STWG) were established. The roles of GWG are to identify measurement systems that could be studied further for possible implementation at 1F. Candidate $$gamma$$ measurement technologies are $$gamma$$ Gross Counting, $$gamma$$ Dosimetry, $$gamma$$-ray Spectroscopy, $$gamma$$-ray Densitometry, $$gamma$$-ray Imaging, Transmission (X-ray) Radiography, Prompt Fission $$gamma$$-ray Counting and Spectroscopy, and Neutron Induced $$gamma$$-ray Spectroscopy. Taking into account system cost, system size, measurement time, development period, and potential for applicability to fuel debris, GWG members have identified recommended combinations among the $$gamma$$ technologies supplemented with neutron measurement technologies. The evaluation was carried out by literature search and simulation works. This paper provides recommendations of the GWG for measurement systems based on mainly $$gamma$$ measurement technologies for nuclear material accountancy of fuel debris at 1F.

Oral presentation

Current status of and issues on research and development for fuel debris at Fukushima Dai-ichi NPS

Washiya, Tadahiro; Hori, Keiichiro

no journal, , 

Current status of and issues for Research and Development on the nature, retrieval, handing and material control of fuel debris

Oral presentation

Characterization study of candidate technologies for nuclear material quantification in fuel debris at Fukushima Daiichi Nuclear Power Station, 1; General outline

Nagatani, Taketeru; Komeda, Masao; Shiba, Tomooki; Maeda, Makoto; Nauchi, Yasushi*; Sagara, Hiroshi*; Kureta, Masatoshi; Tomikawa, Hirofumi; Okumura, Keisuke; Heinberg, C.; et al.

no journal, , 

no abstracts in English

Oral presentation

Characterization study of candidate technologies for nuclear material quantification in fuel debris at Fukushima Daiichi Nuclear Power Station, 1; General outline

Nagatani, Taketeru; Komeda, Masao; Shiba, Tomooki; Nauchi, Yasushi*; Sagara, Hiroshi*; Kosuge, Yoshihiro*; Okumura, Keisuke; Maeda, Makoto; Toh, Yosuke; Hori, Keiichiro

no journal, , 

no abstracts in English

Oral presentation

Characterization study of four candidate technologies for nuclear material quantification in fuel debris at Fukushima Daiichi Nuclear Power Station, 1; General outline

Nagatani, Taketeru; Komeda, Masao; Shiba, Tomooki; Nauchi, Yasushi*; Sagara, Hiroshi*; Kosuge, Yoshihiro*; Okumura, Keisuke; Maeda, Makoto; Toh, Yosuke; Hori, Keiichiro

no journal, , 

Patent

破損・溶融燃料含有物質中の核物質量の計測装置及び計測方法

堀 啓一郎; 石見 明洋; 勝山 幸三; 中村 博文; 井上 尚子

深澤 哲生*; 中村 友隆*; 矢澤 紀子*; 佐藤 記徳*; 星野 国義*

JP, 2015-090369  Patent licensing information  Patent publication (In Japanese)

【課題】燃料デブリを対象としたX線CT装置の利用により核物質量を計測することを可能とする破損・溶融燃料含有物質中の核物質量の計測装置及び計測方法を提供する。 【解決手段】燃料デブリを収納した燃料デブリ収納容器に対してX線を回転走査しながら照射して前記燃料デブリ収納容器を透過したX線を検知し、燃料デブリの密度の情報を得る第1の測定部と、燃料デブリ収納容器からの放射線を測定する第2の測定部と、第2の測定部で測定した放射線を第1の測定部で測定した燃料デブリの密度により補正し、補正後の放射線から燃料デブリの核物質量を定める処理部により構成されたことを特徴とする。

15 (Records 1-15 displayed on this page)
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