Abstract
During the reflood of the reactor core after a large break loss of coolant accident (LOCA), the fuel cladding temperature exceeds the Leidenfrost temperature, hindering the rewetting of the fuel rods. Under this condition, droplet dynamics becomes important to restrict the temperature rise and prevent damages to the fuel rods. In this work, a simple model is proposed to study the dynamic interaction between a droplet and a wall heated beyond the Leidenfrost temperature, with an improved lumped approach adopted for the transient heat transfer and a modified lubrication approximation for the vapor flow. The model was compared favorably with experimental data from the literature and used to study the influence of key parameters of the droplet-wall interaction. A heat removal of 69.7 mJ per droplet was obtained under typical reflood conditions, confirming that droplets contribute to heat removal by superheated vapor in the order of one tenth.
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