Thermodynamic analysis shows changes in gas phase composition during fast neutron irradiation at 13.6% burnup, indicating implications for nuclear materials.
The composition of the gas phase over uranium-plutonium nitride UPuNO containing oxygen impurities and fission products after fast neutron irradiation to a burnup of 13.6% heavy atoms (h.a.) was subjected to a thermodynamic analysis in the temperature interval 900–2000 K. In this interval, the accumulation of fission products in the fuel leads to the formation of a multicomponent gas phase containing the following main elements and compounds: fuel (Pu, PuO, PuN, U, UO, UN), highly volatile (Cs, N, Ba, Sr, CsI, BaI, SrI, I), volatile (Te, Pd, BaO, NdO, LaO, SrO, CeO), low-volatile metallic (Nd, Mo, Y, Tc, La, Ce, Zr), and low-volatile nitrides (NdN, LaN, CeN, YN, ZrN). The partial pressures of these components of the gas phase over UPuNO at the 13.6% burnup as functions of temperature were calculated.
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G. S. Bulatov (2025) studied this question.
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