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Report No.

Progress Report on the Molten UO$$_{2}$$ Drop Experiment

Mizuta, H.; Hirabayashi, F.*; Yokozawa, Naoki; Fukushima, Y.*

A series of 30 experiments were performed to examine the fragmentation characteristics of Sodium-Fuel Interaction by dropping molten UO$$_{2}$$ into sodium. In this experiment, annular UO$$_{2}$$ pellets were heated by the center line heating of tungsten rod, and the molten UO$$_{2}$$ droplets fell into the sodium tank. The fragmentations of the droplets on the surface of liquid sodium were photographed with high speed camera at 500-2000 pictures/sec. The Pressure and temperature of sodium tank were measured. The particle characteristics of the UO$$_{2}$$ residue was examined on the particle size distribution, the particle surface condition, and the grain characteristic of the particles for the fragmentation mechanism. These examination indicates that the UO$$_{2}$$ particles can be assumed to be spherical and to have the log-normal distribution function. The most pessimistic particle size distribution at present can be represented by the equation. Where f/supi(D)dD=weight percent of particles in size range D to D+



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