Abstract
In the article presented are the results modeling the behavior of mixed uranium-plutonium nitride fuel with an admixture of oxygen and carbon during irradiation in fast reactor. It was shown that accumulation of fission products and formation of secondary phases lead to formation of heterogeneous multicomponent solid solution including, in particular, metal, telluride, oxide, intermetal and sesquialteral nitride secondary phases. Influence of the secondary phases formed during irradiation on the effective thermal conductivity of the fuel is assessed in the framework of a generalized theory by Odelevskii developed for heterogeneous systems with isolated inclusions. It was found that in the irradiated nitride fuel, the main correction of the thermal conductivity is related to formation of the U2N3 phase. As it is shown, that with increase of fuel burnup and growth of secondary condensed phases, the effective thermal conductivity decreases up to about 3% for burnup of 5.5%.
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