Vapor explosions: Prediction of a critical liquid-corium velocity in vapor destabilization mechanism of corium melt in the fuel-coolant interactions - FCI

In this paper, utilizing a simplified physical model an analytical expression for the prediction of most probable corium fragment size as function of relative velocity corium-coolant is derived. Combining this equation with the available experimental data an important consequence for the nuclear safety result: the existence of a critical velocity corium-coolant which maximizes the destabilization of film boiling when an external pressure wave is supplied.