Evaluation for characteristics of heat resisting materials in passive debris cooling system

It is necessary to prevent release of radioactive materials into the environment due to damage to a containment vessel in a severe accident. So we have been developing a safety system to stabilize the core melt and to avoid a molten core concrete interaction (MCCI). Although water will be injected to the debris cooling system, it is difficult to hold high temperature debris. There should be installed heat resisting materials with high melting points. The heat resisting materials can protect the concrete or the system (like core-catcher) against short-term thermal impingement during the falling of the molten core. And it can protect against long-term erosion after water injection. Thereby we plan to carry out interaction tests between debris and heat resisting materials. In this study we will conduct several experiments with heat resisting materials in high temperature. (author)