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Nuclear Reactor Engineering Lab
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A reactor physics lab that uses computation to reproduce the behavior of neutrons inside nuclear reactors.
AboutAbout the lab
Contributing to more advanced engineering through reactor physics research.
The Nuclear Reactor Engineering Lab studies reactor physics, the field concerned with understanding how neutrons behave inside nuclear reactors and how nuclear fission chain reactions proceed.
The lab researches mathematical models and computational algorithms for the equations that describe the behavior of neutron populations and the phenomena in which one nucleus changes into another.
It goes as far as incorporating the results into CBZ, software the lab develops in-house.
The lab also applies techniques cultivated in reactor physics to fields outside nuclear power, such as thermal evaluation of radioactive waste repositories and medical applications of quantum beams.
Key terms
- Reactor physics
- The field that deals with how neutrons move inside a nuclear reactor and how they react with nuclei. Also called nuclear reactor physics.
- Nuclear fission chain reaction
- A phenomenon in which neutrons released by nuclear fission cause the next nuclei to split, so that the reaction continues one after another.
- Decay heat
- Heat that radioactive materials continue to release as they decay, even after a nuclear reactor has been shut down.
NewsLab news
View More ↗ResearchResearch themes
With the aim of making fission reactors safer and using them more effectively, the lab conducts research with an eye toward future outer-planet exploration and ocean development. Its main focus is research that reproduces the behavior of neutrons inside nuclear reactors by computation, and the development of general-purpose software for that purpose.
*Illustrative imageReactor physics simulation
The lab conducts a wide range of research that numerically simulates the behavior of neutrons and nuclear fission chain reactions inside nuclear reactors. Its work includes developing automatic algorithms that use mathematical methods to simplify complex computational models of fuel burnup, and evaluating the uncertainty of decay heat.
*Illustrative imageDeveloping the reactor physics analysis code CBZ
CBZ is software that calculates how neutrons and gamma rays move in and around a nuclear reactor and how they react with nuclei. It is written in C++ and can perform a variety of calculations by combining multiple computational methods. The lab has continued developing it since 2012.
*Illustrative imageApplying reactor physics techniques to other fields
The transport and diffusion equations that neutrons obey are also used in other engineering fields. The lab applies techniques cultivated in reactor physics to thermal evaluation of radioactive waste repositories, medical applications of quantum beams, thermal radiation calculations, and more.
MembersFaculty
The members of the Nuclear Reactor Engineering Lab consist of faculty members, administrative staff, and students in the doctoral, master's, and undergraduate programs.As of 2026
- ProfessorGo Chiba
- Associate ProfessorTatsuya Fujita
- Assistant ProfessorJun-Shuang Fan
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: “Cerenkov Effect” United States Nuclear Regulatory Commission / Public domain (cropped)
- Reactor physics simulation: “RIAN archive 132603 Nuclear power reactor fuel assembly (cropped)” Ruslan Krivobok / CC BY-SA 3.0 (cropped)
- Developing the reactor physics analysis code CBZ: “Circuit (70680553)” Yuri Samoilov / CC BY 3.0 (cropped)
- Applying reactor physics techniques to other fields: “STS-3 infrared on reentry” NASA / Public domain (cropped)
- Related lab (Quantum Beam Applied Medical Engineering Lab): “Cyclotron - University of Washington” Ikiwaner / CC BY-SA 3.0 (cropped)
- Related lab (Nuclear Environmental Materials Lab): “Onkalo driving tunnel” kallerna / CC BY-SA 4.0 (cropped)
- Related lab (Quantum Beam Materials Analysis and Harsh-Environment Semiconductor Device Engineering Lab): “Syn diamonds” 2x910 / CC BY-SA 4.0 (cropped)
- Related lab (Nuclear Power Support Social Infrastructure Technology Lab): “Advanced Test Reactor” Argonne National Laboratory / CC BY-SA 2.0 (cropped)
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