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Report No.

Melting temperature and thermal conductivities of corium prepared from UO$$_{2}$$ and zircalloy-2

Kato, Masato  ; Uchida, Teppei; Hiroka, Shun ; Akashi, Masatoshi ; Komeno, Akira ; Morimoto, Kyoichi 

Pellets of UO$$_{2}$$ react with zircalloy (Zry) cladding to form corium in severe accident of LWRs. It is important to know thermal and chemical properties of corium to analyze fuel behavior in severe accident and to treat corium in post-accident. However, their data are limited. In this work, corium was prepared from UO$$_{2}$$ and Zry-2, and its melting temperature and thermal conductivity were investigated as a parameter of U content. In the heating curves in the melting temperature measurement, thermal arrests were clearly observed. The solidus temperatures of 75%U, 50%U and 25%U-sample were determined to be 2622$$^{circ}$$C, 2509$$^{circ}$$C and 2540$$^{circ}$$C, respectively, which were consistent with solidus temperature reported in the UO$$_{2}$$-ZrO$$_{2}$$ system. The melted samples were taken from W-capsule and sliced in a plate. Thermal diffusivity of the plate sample was measured. The data were lower than that of UO$$_{2}$$.



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