Аннотация:Thermodynamic modeling of changes in the chemical and phase composition of uranium–zirconiumcarbonitride nuclear fuel U0.9Zr0.1(C0.495N0.495O0.01)0.995 containing an oxygen impurity depending on the temperature (1600–2000 K) and burnup (1–10%) was performed. Under these conditions, accumulation of fi ssion products in the fuel leads to the formation of a heterogeneous system consisting of a solid solution based on uranium–zirconium oxycarbonitride containing lanthanides and of separate condensed carbide, intermetallic,and oxide phases, of cesium and its iodide, of barium and its telluride, of strontium, and of technetium. The concentrations of these phases at the indicated temperatures and burnup levels were calculated
