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The chemical states of fission products have
been theoretically determined for the irradiated carbide fuel of
Fast Breeder Test Reactor (FBTR) at Kalpakkam, India, at
different burn-ups. The SOLGASMIX-PV computer code was used to
determine the equilibrium chemical composition of the fuel. The
system was assumed to be composed of a gaseous phase at one
atmosphere pressure, and various solid phases. The distribution
of elements in these phases and their chemical states at
different temperatures were calculated as a function of burn-up.
The FBTR fuel, (U0.3Pu0.7)C1+c,
was loaded with C/M values in the range, 1.03–1.06. The present
calculations indicated that even for the lowest starting C/M of
1.03 in the FBTR fuel, the liquid metal phase of (U, Pu), should
not appear at a burn-up as high as 150 GWd/t. 2006 Elsevier B.V.
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