Toru Obara

Toru Obara
Nuclear Energy Division

Lab. HP
Researcher Link
Web of Science | ORCID

Feature of Research

We are performing the research for innovative nuclear systems which can solve the problems in energy and environment in future and for the criticality safety of fuel debris in the process of decommissioning of Fukushima-Daiichi NPPs. The research is performed using high speed servers and the supercomputer TSUBAME based on the theory of reactor physics.

Outline of Research

  1. Conceptual study of innovative nuclear reactors
    We have performed the design study of small high temperature gas-cooled reactors. Currently, we are focusing on the study for Breed and Burn fast reactors, which can achieve high utilization of uranium resource and less amount of spent fuel without using reprocessing facility. The conceptual design study is performed by numerical analysis.
  2. Criticality safety study for decommissioning of Fukushima-Daiichi NPPs
    To proceed the decommissioning of Fukushima-Daiichi NPPs safely, the criticality safety of fuel debris in the removing process is one of the important issues. We are proceeding the study to prevent criticality accident of the fuel debris and to estimate the effect in the case of criticality accident whose knowledge is useful to establish measures to protect workers. The study is performed by computer simulation.


Innovative nuclear system, Breed and Burn fast reactor, liquid metal cooled fast reactor, lead-bismuth eutectic, small modular reactor, SMR, high temperature gas-cooled reactor, Fukushima-Daiichi NPS accident, fuel debris, criticality safety, reactor physics