PROFESSOR OF RESEARCH LABORATORY FOR NUCLEAR REACTORS, TOKYO INSTITUTE OF TECHNOLOGY
DIRECTOR OF CENTER FOR RESEARCH INTO INNOVATIVE NUCLEAR ENERGY SYSTEMS (CRINES), TOKYO INSTITUTE OF TECHNOLOGY
In criticality accidents of fuel solutions, if there are several solution tanks located near the tank that becomes super-critical, the total released energy can be larger than that involving just one tank, because of the neutron interaction between the tanks. Thus, it is important to perform transient analysis in such cases by taking into account the neutron interaction between the tanks. A kinetic analysis code based on an integral kinetic model was developed and applied to the kinetic analysis of criticality accidents in a weakly coupled system. If it is possible to know the total energy release in a compound accident compared to an accident in a single solution tank, this would be useful for the protection against radiation in such accidents. The methodology to predict the total energy is shown in criticality accidents involving several fuel solution tanks from the knowledge of how much energy is released in a single solution tank using the integral kinetic model.