Water injection mode of molten fuel/coolant interaction is a key issue during the steam generator tube rupture in liquid metal reactors. The fragmentation behaviors of plunging water droplet into a high temperature molten tin liquid pool were studied by using a high speed video camera. Photographs of the water droplet configuration, the vaporization at the interface between the melt and water, and the vapor film disturbance were obtained. The results demonstrated that the water droplet in the molten tin pool was near spherical shape initially and the vapor was generated and accumulated in the bottom of the water droplet. The steam explosions happened when vapor film collapses finally.

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