Obara Research Group, Institute of Science Tokyo

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Obara Research Group (Obara Lab), Laboratory for Zero-Carbon Energy, Institute of General Research, Institute of Science Tokyo
東京科学大学 総合研究院 ゼロカーボンエネルギー研究所
小原研究室 Increasing world population, increasing energy consumption, climate change and environmental destruction due to carbon dioxide emissions, and resource depletion are important issues that will become more serious worldwide in the future. In the Obara Research Group, we are working on innovative nuclear energy systems that are safe and produce less waste to solve these problems.

世界の人口の増加、エネルギー消費量の増加、二酸化炭素放出による気候変動や環境破壊、資源の枯渇は今後世界的に深刻化していく重要な問題です。小原研究室では、これらの問題を解決する安全で廃棄物の少ない革新的原子力システムの研究に取り組んでいます。

August 27, 2026Dr. Alexandru Stafie, who conducted research at the Obara Laboratory and completed his doctoral program i...
27/08/2026

August 27, 2026
Dr. Alexandru Stafie, who conducted research at the Obara Laboratory and completed his doctoral program in 2020, visited Prof. Obara.

小原研で2025年に博士課程を修了したスタフィ アレクサンドルさんが小原教授を訪問しました。

August 7, 2026We had a party at the lab before summer break. Two alumni also joined us.研究室で夏休み前の暑気払いをしました。卒業生二人も参加してくれまし...
13/08/2026

August 7, 2026
We had a party at the lab before summer break. Two alumni also joined us.

研究室で夏休み前の暑気払いをしました。卒業生二人も参加してくれました。

13/08/2026

August 13, 2026

Our group's research findings were published in the academic journal Journal of Nuclear Engineering and Technology. This is a paper about the burnup performance from the startup to the equilibrium state in metallic fuel sodium cooled RFBB (RFBB-MS).
https://doi.org/10.1016/j.net.2026.104641

私たちのグループの研究成果が学術雑誌Journal of Nuclear Engineering and Technology に掲載されました。ナトリウム冷却金属燃料回転型燃料シャッフリングブリードバーン高速炉(RFBB-MS)の起動から平衡状態に至るまでの燃焼特性に関する論文です。

May 16, 2026We held the Ohara Lab’s final spring hike, visiting Yakumo Shrine, Gion-yama, and Hōkai-ji Temple in Kamakur...
18/05/2026

May 16, 2026

We held the Ohara Lab’s final spring hike, visiting Yakumo Shrine, Gion-yama, and Hōkai-ji Temple in Kamakura with lab members and alumni. The weather was beautiful, and we were able to enjoy Kamakura’s shrines and temples as well as the natural beauty of the mountains.

研究室のメンバーと小原研の卒業生で鎌倉の八雲神社、祇園山、宝戒寺をまわる小原研最後の春のハイキングをしました。とても良い天気で鎌倉の神社仏閣と山の自然を楽しむことができました。

April 2, 2026Dr. Nguyen Hoang Hai, who conducted research at the Obara Laboratory and completed his doctoral program in ...
04/04/2026

April 2, 2026
Dr. Nguyen Hoang Hai, who conducted research at the Obara Laboratory and completed his doctoral program in 2020, visited Prof. Obara.

小原研で2020年に博士課程を修了したハイグエンホアンさんが小原教授を訪問しました。

April 4, 2026An article by our research group was published in technical journal “Journal of Nuclear Science and Technol...
04/04/2026

April 4, 2026

An article by our research group was published in technical journal “Journal of Nuclear Science and Technology”. This is an article about the study of transition phase from the start-up of Rotational Fuel-shuffling Breed-and-Burn fast reactor with metallic fuel and lead-bismuth eutectic coolant (RFBB-MLB).

Zhao, Xucheng, and Toru Obara. 2026. “Startup Core Design of Metallic-Fueled Lead-Bismuth Eutectic-Cooled Rotational Fuel-Shuffling Breed-and-Burn Fast Reactor.” Journal of Nuclear Science and Technology, March, 1–15. doi:10.1080/00223131.2026.2630903.

私たちの研究グループの研究成果が学術雑誌Progress in Nuclear Energy に掲載されました。金属燃料と鉛ビスマス共晶合金冷却材を用いた回転型燃料シャッフリングブリードバーン高速炉(RFBB-MLB)の起動から平衡状態に至るまでの燃焼特性に関する論文です。

This study explores methodology for startup core design integrating enrichment and shuffling optimization across transient phases. Metallic fuel and lead-bismuth eutectic (LBE) coolant were selecte...

March 11-13, 2026Prof. Obara and Mr. Hajime Saigusa attended the 2026 Annual Meeting of Atomic Energy Society of Japan i...
30/03/2026

March 11-13, 2026
Prof. Obara and Mr. Hajime Saigusa attended the 2026 Annual Meeting of Atomic Energy Society of Japan in Kumamoto, and did the following presentation.

Hajime Saigusa, Toru Obara, “Study on reactor power density flatting of metallic fuel sodium cooled RFBB core”, Proc. of 2026 annual meeting of Atomic Energy Society of Japan, 1E05 (2026).

小原教授と三枝　翻さんが熊本城ホールで開催された2026年日本原子力学会春の年会に参加し以下の発表をしました。

三枝　翻、小原徹、“金属燃料ナトリウム冷却RFBBの炉内出力分布平坦化”、日本原子力学会2026年春の年会予稿集，2026年3月11日～13日，熊本城ホール、1E05 (2026)

March 30, 2026The cherry blossoms on the campus are in full bloom!今キャンパスの桜は満開です！
30/03/2026

March 30, 2026
The cherry blossoms on the campus are in full bloom!
今キャンパスの桜は満開です！

March 26, 2026Mr. Hajime Saigusa was awarded the degree of master of engineering by Institute of Science Tokyo and gradu...
30/03/2026

March 26, 2026
Mr. Hajime Saigusa was awarded the degree of master of engineering by Institute of Science Tokyo and graduated the master’s degree program. Congratulations!
Title of master thesis: Study on Power Flattening in the Reactor Core of a Sodium-Cooled Metal-Fueled RFBB

三枝翻さんが東京科学大学より修士（工学）の学位を授与され、修士課程を修了しました。おめでとうございます！
修士論文題目：ナトリウム冷却金属燃料RFBBの炉内出力平坦化に関する研究

March 26, 2026Mr. Yosuke Karasawa was awarded the degree of bachelor of engineering by Institute of Science Tokyo and gr...
30/03/2026

March 26, 2026
Mr. Yosuke Karasawa was awarded the degree of bachelor of engineering by Institute of Science Tokyo and graduated the bachelor’s degree program. Congratulations!
Title of independent project: Study on the Cost Comparison Between RFBB and Closed-Cycle FBR

唐澤陽介さんが東京科学大学より学士（工学）の学位を授与され、学士課程を修了しました。おめでとうございます！
特定課題プロジェクト題目：RFBBとクローズドサイクルFBRのコスト比較に関する研究

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N1-19, 2-12-1 Ookayama
Meguro-ku, Tokyo
152-8550

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