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Obara Lab
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The lab researches innovative nuclear energy systems to address environmental and resource issues.
AboutAbout the lab
Going back to the basic principles of nuclear reactors.
The Obara Lab conducts research on future nuclear energy systems and on the safe decommissioning of the Fukushima Daiichi Nuclear Power Station.
Today's nuclear power systems tend to be regarded as complete, but they are by no means so.
Going back to the basic principles of nuclear reactors, the lab pursues the question of what kind of nuclear energy system would truly meet the needs of society.
The lab carries out its research through a variety of numerical simulations, using the lab's servers and the university's supercomputer.
Key terms
- Fast reactor
- A nuclear reactor that causes fission with fast neutrons. A type that can use fuel resources efficiently
- Fuel debris
- Melted reactor core material from an accident that has mixed with surrounding structural materials and solidified
- Criticality accident
- An accident in which a fission chain reaction occurs somewhere other than inside a nuclear reactor
NewsLab news
The lab's findings were published in J. Nucl. Sci. Technol.
Prof. Obara was awarded an honorary doctorate by the National University of Mongolia
A doctoral student received the Encouragement Award from the Reactor Physics Division of the Atomic Energy Society of Japan
A doctoral student received the Kakuyukai Award (Doctoral Thesis Award), March 2026
A master's student received the Kakuyukai Award (Master's Thesis Award), March 2026
ResearchResearch themes
Based on reactor physics theory and computer simulation, the lab explores what future nuclear energy systems could look like. It also conducts research to help carry out the decommissioning of the Fukushima Daiichi Nuclear Power Station safely.
*Illustrative imageInnovative Reactor Concepts
Based on reactor physics theory, the lab uses computer simulation to study the basic concepts and characteristics of new nuclear reactors. It currently focuses on the breed-and-burn fast reactor, which requires neither fuel enrichment facilities nor reprocessing facilities.
*Illustrative imageCriticality Safety of Fuel Debris
The lab conducts research to ensure that no criticality accident occurs, even by chance, when fuel debris is removed from the Fukushima Daiichi Nuclear Power Station. It also uses calculations based on reactor physics theory to investigate what phenomena would occur if such an accident did happen.
MembersFaculty
The members of the Obara Lab consist of faculty members, master's students, and administrative support staff.As of 2026
- ProfessorToru ObaraPublications ↗
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Fast Flux Test Facility Reactor Core” ENERGY.GOV / Public domain (cropped)
- Innovative Reactor Concepts: “Beloyarsk NNP-3” Hardscarf、Memorino / Public domain (cropped)
- Criticality Safety of Fuel Debris: “Aerial photo of Fukushima Daiichi Nuclear Power Plant 2021” 資源エネルギー庁 / CC BY 4.0 (cropped)
- Related lab (相樂研究室): “Nuclear Fuel Pellets ( )” Nuclear Regulatory Commission from US / Public domain (cropped)
- Related lab (分山研究室): “Pylons carrying electricity transmission lines - geograph.org.uk - 7869746” Jim Smillie / CC BY-SA 2.0 (cropped)
- Related lab (松本研究室): “Purple cells” National Cancer Institute / Public domain (cropped)
- Related lab (石塚研究室): “HFIR Refueling July )” Oak Ridge National Laboratory / CC BY 2.0 (cropped)
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