Abstract
Spontaneous vapor explosion can occur when a layer of the high temperature molten material lies on the water pool or on the moisture floor. This is so-called base-triggered vapor explosion. The base-triggered vapor explosion is supposed to occur in the case of a severe accident in a nuclear reactor and in other facilities. It is very important to clarify the occurrence possibility of the base-triggered vapor explosion from the viewpoints of the prediction and the prevention of the vapor explosion. In the present research, the occurrence conditions of the vapor explosion including the base-triggered vapor explosion are experimentally investigated. In this paper, preliminary results of the experiment of the occurrence condition of the base-triggered vapor explosion are reported besides the comparison with the existing theory.
