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Nuclear Transmutation Systems Engineering Lab
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The lab researches safer ways to use nuclear energy with a critical assembly.

AboutAbout the lab
Nuclear energy, made safer and more efficient.
The Nuclear Transmutation Systems Engineering Lab conducts basic research in reactor physics, and research on developing and applying new radiation measurement systems, in order to develop new nuclear transmutation systems that use nuclear energy more safely and efficiently.
Its research centers on experiments using the critical assembly experimental facility (KUCA) and the analysis of their results.
Key terms
- criticality
- The state in which a nuclear fission chain reaction in a reactor continues at a constant rate
- subcriticality
- A measure of how much safety margin a reactor has below criticality
- thorium
- An element proposed as a nuclear fuel to replace uranium
ResearchResearch themes
Through experiments and analysis using the critical assembly experimental facility (KUCA), the lab studies reactor physics and new radiation measurement systems.
*Illustrative imageCriticality Safety and Nuclear Safety
To ensure criticality safety at nuclear fuel cycle facilities, the lab develops methods and detectors for measuring subcriticality. The method is also planned for use in the removal of fuel debris at the Fukushima Daiichi Nuclear Power Plant.
*Illustrative imageNew Radiation Detectors and Detection Technology
The lab develops a new radiation measurement system that combines an accelerator-based neutron source with multiple detectors, and applies it to technology for finding buried landmines and hidden materials inside containers.
*Illustrative imageThorium-Fueled Reactors
The lab conducts basic research on the nuclear characteristics and fuel breeding characteristics of reactors that use thorium, which has features such as producing less high-level radioactive waste.
MembersFaculty
- ProfessorYasunori Kitamura
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: “10,000th Operation at the Annular Core Research Reactor - Sept. )” Nuclear Regulatory Commission from US / Public domain (cropped)
- Criticality Safety and Nuclear Safety: “Godiva critical mass assembly machine” U.S. Department of Energy / Public domain (cropped)
- New Radiation Detectors and Detection Technology: “Landmine dog in BiH” Norsk Folkehjelp Norwegian People's Aid from Norway / CC BY 2.0 (cropped)
- Thorium-Fueled Reactors: “Thorium reactor ORNL” ORNL / Public domain (cropped)
- Related lab (核物質管理学研究分野): “UO2 Pellet” Chemolunatic / CC BY-SA 4.0 (cropped)
- Related lab (放射線管理学研究分野): “Dosimeter measuring radiation in the Chernobyl Exclusion Zone” Jennifer Boyer from Fredrick, Maryland, USA / CC BY 2.0 (cropped)
- Related lab (原子力防災システム研究分野): “UO2lattice” Cadmium at English Wikipedia / Public domain (cropped)
- Related lab (熱エネルギーシステム研究分野): “ORNL Spallation Neutron Source ( )” ENERGY.GOV / Public domain (cropped)
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