Supercritical Kinetic Analysis of Accumulated Fuel Debris in the Fukushima-Daiichi NPS

摘要

We carried out a space-dependent kinetic analysis of fragmented debris particles that accumulated on consolidated fuel debris in light water. Our results showed that the space-dependent analysis code MIK can provide information about the released energy in each fuel debris region. This provides useful information for the exact estimation of radiation dose in the event of a re-criticality accident. More detailed analyses are needed for fuel debris with various geometries and various compositions.