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JAEA Reports

Applicability evaluation of Type A transport container for off-site transportation of small-amount of fuel debris

Sakamoto, Masahiro; Okumura, Keisuke; Kanno, Ikuo; Matsumura, Taichi; Terashima, Kenichi; Riyana, E. S.; Mizokami, Masato*; Mizokami, Shinya*

JAEA-Research 2024-017, 14 Pages, 2025/03

JAEA-Research-2024-017.pdf:1.34MB

In the TEPCO's Fukushima Daiichi Nuclear Power Station (1F), a trial retrieval of fuel debris with small-amount from Unit 2 is planned. The retrieved fuel debris will be transported out of 1F to Institutes in Ibaraki prefecture for analysis. The analyzed results will be utilized for the improvement of the processes (retrieval, transportation and storage) in the fuel debris management as feedback, and also for the development of technologies necessary in the future. The weight of fuel debris in the trial retrieval is planned to be a few grams. After the trial, the scale of retrieval will be expanded step by step. In the trial retrieval, a rational transportation container should be considered beforehand, according to the laws and regulations associated with the off-site transportation. The transportation container has a classification and the classification is decided according to the radioactivity of the material in the container. In this report, we evaluated the applicability of the Type A transport container to contribute to the safety assessment of retrieved fuel debris.

Journal Articles

Characterization of neutrons emitted by an expected small amount of fuel debris in a trial retrieval from Fukushima Daiichi Nuclear Power Station

Matsumura, Taichi; Okumura, Keisuke; Sakamoto, Masahiro; Terashima, Kenichi; Riyana, E. S.; Kondo, Kazuhiro*

Nuclear Engineering and Design, 432, p.113791_1 - 113791_9, 2025/02

 Times Cited Count:0 Percentile:0.00(Nuclear Science & Technology)

Journal Articles

Development of a theoretical scaling factor method for the inventory estimation of difficult-to-measure nuclide Cs-135 in fuel debris and radioactive wastes

Sakamoto, Masahiro; Okumura, Keisuke; Kanno, Ikuo; Matsumura, Taichi; Terashima, Kenichi; Riyana, E. S.; Kaneko, Junichi*; Mizokami, Masato*; Mizokami, Shinya*

Journal of Nuclear Science and Technology, 10 Pages, 2025/00

 Times Cited Count:0 Percentile:0.00(Nuclear Science & Technology)

Journal Articles

Preliminary study of the criticality monitoring method based on the simulation for the activity ratio of short half-life noble-gas fission products from fuel debris

Riyana, E. S.; Okumura, Keisuke; Sakamoto, Masahiro; Matsumura, Taichi; Terashima, Kenichi; Kanno, Ikuo

Journal of Nuclear Science and Technology, 61(2), p.269 - 276, 2024/02

 Times Cited Count:0 Percentile:0.00(Nuclear Science & Technology)

Journal Articles

Characterization of bremsstrahlung and $$gamma$$-rays of fuel debris

Matsumura, Taichi; Okumura, Keisuke; Fujita, Manabu*; Sakamoto, Masahiro; Terashima, Kenichi; Riyana, E. S.

Radiation Physics and Chemistry, 199, p.110298_1 - 110298_8, 2022/10

 Times Cited Count:3 Percentile:42.88(Chemistry, Physical)

Journal Articles

Depletion calculation of subcritical system with consideration of spontaneous fission reaction

Riyana, E. S.; Okumura, Keisuke; Sakamoto, Masahiro; Matsumura, Taichi; Terashima, Kenichi

Journal of Nuclear Science and Technology, 59(4), p.424 - 430, 2022/04

 Times Cited Count:1 Percentile:10.00(Nuclear Science & Technology)

Journal Articles

A Prediction method for the dose rate of fuel debris depending on the constituent elements

Terashima, Kenichi; Okumura, Keisuke

Journal of Advanced Simulation in Science and Engineering (Internet), 8(1), p.73 - 86, 2021/03

Journal Articles

Gamma detector response simulation inside the pedestal of Fukushima Daiichi Nuclear Power Station

Riyana, E. S.; Okumura, Keisuke; Terashima, Kenichi; Matsumura, Taichi; Sakamoto, Masahiro

Mechanical Engineering Journal (Internet), 7(3), p.19-00543_1 - 19-00543_8, 2020/06

Journal Articles

Calculation of gamma and neutron emission characteristics emitted from fuel debris of Fukushima Daiichi Nuclear Power Station

Riyana, E. S.; Okumura, Keisuke; Terashima, Kenichi

Journal of Nuclear Science and Technology, 56(9-10), p.922 - 931, 2019/09

 Times Cited Count:7 Percentile:53.80(Nuclear Science & Technology)

Journal Articles

Calculation of gamma and neutron emission characteristics emitted from fuel debris as a basis for determination of suitable detector system

Riyana, E. S.; Okumura, Keisuke; Terashima, Kenichi

Proceedings of 27th International Conference on Nuclear Engineering (ICONE-27) (Internet), 4 Pages, 2019/05

Journal Articles

Machine-learning guided discovery of a new thermoelectric material

Iwasaki, Yuma*; Takeuchi, Ichiro*; Stanev, V.*; Gilad Kusne, A.*; Ishida, Masahiko*; Kirihara, Akihiro*; Ihara, Kazuki*; Sawada, Ryoto*; Terashima, Koichi*; Someya, Hiroko*; et al.

Scientific Reports (Internet), 9, p.2751_1 - 2751_7, 2019/02

 Times Cited Count:83 Percentile:93.83(Multidisciplinary Sciences)

Journal Articles

Electronic nematicity above the structural and superconducting transition in BaFe$$_2$$(As$$_{1-x}$$P$$_x$$)$$_2$$

Kasahara, Shigeru*; Shi, H. J.*; Hashimoto, Kenichiro*; Tonegawa, Sho*; Mizukami, Yuta*; Shibauchi, Takasada*; Sugimoto, Kunihisa*; Fukuda, Tatsuo; Terashima, Takahito*; Nevidomskyy, A. H.*; et al.

Nature, 486(7403), p.382 - 385, 2012/06

 Times Cited Count:399 Percentile:99.23(Multidisciplinary Sciences)

Oral presentation

Development of a decay heat estimation method for various fuel debris

Sakamoto, Masahiro; Terashima, Kenichi; Matsumura, Taichi; Fujita, Manabu*; Okumura, Keisuke

no journal, , 

It is important to estimate the decay heat of the fuel debris at the Fukushima Daiichi Nuclear Power Station in examining the cooling method and evaluating the heat removal of the debris transport and storage containers for debris retrieval. However, fuel debris is not easy to estimate the decay heat because the composition of nuclides is not clear like the spent fuel whose combustion history is clear. Therefore, we developed a method to easily calculate the decay heat of debris considering parameters such as debris weight, burnup, nuclide release rate, and elapsed time etc.

Oral presentation

Development of theoretical scaling factor method for $$^{135}$$Cs caused by the Fukushima Daiichi NPP accident

Terashima, Kenichi; Sakamoto, Masahiro; Matsumura, Taichi; Okumura, Keisuke; Fujita, Manabu*

no journal, , 

no abstracts in English

Oral presentation

Application of bubble detector to fuel debris detection

Terashima, Kenichi; Sakamoto, Masahiro; Matsumura, Taichi; Kaburagi, Masaaki; Riyana, E. S.; Nomi, Takayoshi; Okumura, Keisuke

no journal, , 

no abstracts in English

Oral presentation

Correlation between the canisters criticality and activity ratio of short-half-life noble-gas fission products under various fuel debris material compositions

Riyana, E. S.; Sakamoto, Masahiro; Matsumura, Taichi; Terashima, Kenichi; Okumura, Keisuke

no journal, , 

Oral presentation

Preliminary study on nuclear materials imaging in fuel debris from the Fukushima Daiichi Nuclear Power Station using a neutron pinhole camera

Riyana, E. S.; Sakamoto, Masahiro; Matsumura, Taichi; Terashima, Kenichi; Okumura, Keisuke; Kanno, Ikuo

no journal, , 

Oral presentation

Characterization of beta-rays and bremsstrahlung X-rays of fuel debris

Matsumura, Taichi; Fujita, Manabu*; Terashima, Kenichi; Sakamoto, Masahiro; Okumura, Keisuke

no journal, , 

no abstracts in English

Oral presentation

Strontium-90 measurement in trace amount of hard tissues for distribution analysis

Koarai, Kazuma; Matsueda, Makoto; Aoki, Jo; Yanagisawa, Kayo*; Fujiwara, Kenso; Terashima, Motoki; Kino, Yasushi*; Oka, Toshitaka; Okutsu, Kenichi*; Yamashita, Takuma*; et al.

no journal, , 

We demonstrated a method of $$^{90}$$Sr measurement in small pieces of hard tissues with radioactivity measurement or ICP-MS measurement. Interference elements of the measurements were removed by chemical separation. We could determine $$^{90}$$Sr in 0.1 g of hard tissues by radioactivity measurement method and ICP-MS method. Limit of detection of the ICP-MS method was lower than that of the radioactivity measurement. The ICP-MS method is adequate method for distribution analysis of $$^{90}$$Sr in the hard tissues.

Oral presentation

Neutron irradiation test of bubble detector for fuel debris detections

Terashima, Kenichi; Matsumura, Taichi; Kaburagi, Masaaki; Sakamoto, Masahiro; Riyana, E. S.; Okumura, Keisuke

no journal, , 

no abstracts in English

37 (Records 1-20 displayed on this page)