Abstract
Severe accidents of nuclear power plant include nuclear and thermal-hydraulic characteristics and the operation of safety systems for a long time. It is difficult to understand the evolution of plant-wide event from only numeric data by simulation. Visualization tool has been developed for the understanding of severe accidents. It displays in the animation , the damage or change in temperature, pressure, concentration, etc in the reactor vessel and containment, which was simulated by the severe accidents code, in order to be able to understand the basic effect and progress of the event.
