[2F06-09] Criticality Safety

[2F09] Radiation Dose by Super Critical Condition of Fuel Debris in Water

*Kodai Fukuda¹, Tuya Delgeraikhan², Toru Obara², Jun Nishiyama² (1. Graduate major in Nuclear Engineering, Tokyo Institute of Technology, 2. Laboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology)

Keywords:Criticality Safety, Criticality Accident, Fuel Debris, Fukushima Daiichi NPS Decommissioning

In this work, the characteristics of super critical behavior in coupled fuel debris system are obtained by using multi-region integral kinetic code MIK and radiation transport code PHITS. Concretely, kinetic characteristics, released energy and radiation dose as the result of criticality accident are obtained in the air-water coupled fuel debris system.