Fluorination Reaction of Uranium Dioxide by Fluorine

概要

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Kinetics of the fluorination reaction of uranium dioxide is studied using un-reacted core model with shrinking particles. The model includes the film mass transfer of fluorine gas and its diffusion in the particle. The rate constants of the model are determined by fitting the experimental data for 370–450°C. The model successfully represents the fluorination in this temperature range. The rate control step is identified by examining the rate constants of the model for 300–1,800°C. For temperature range up to 900°C, the fluorination reaction is rate controlling. For over 900°C, both mechanisms of the mass transfer of fluorine and the fluorination reaction control the rate of the fluorination. With further increase of the temperature, however, the fluorination reaction becomes so fast that the mass transfer of fluorine eventually controls the rate of the fluorination.
社団法人日本原子力学会の論文
2004-02-25