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Abstract <p>The composition of the gas phase over uranium–plutonium nitride U<sub>0.8</sub>Pu<sub>0.2</sub>N<sub>0.995</sub>0<sub>0.005</sub> 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 species (Pu, PuO, PuN, U, UO, UN), highly volatile species (Cs, N<sub>2</sub>, Ba, Sr, CsI, BaI, SrI, I), volatile species (Te, Pd, BaO, NdO, LaO, SrO, CeO), low-volatile metals (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 U<sub>0.8</sub>Pu<sub>0.2</sub>N<sub>0.995</sub>0<sub>0.005</sub> at the 13.6% burnup as functions of temperature were calculated.</p>

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Modeling of the Composition of the Gas Phase over Uranium–Plutonium Mononitride Containing Oxygen Impurities and Fission Products

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • G. S. Bulatov,
  • K. E. German

摘要

Abstract

The composition of the gas phase over uranium–plutonium nitride U0.8Pu0.2N0.99500.005 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 species (Pu, PuO, PuN, U, UO, UN), highly volatile species (Cs, N2, Ba, Sr, CsI, BaI, SrI, I), volatile species (Te, Pd, BaO, NdO, LaO, SrO, CeO), low-volatile metals (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 U0.8Pu0.2N0.99500.005 at the 13.6% burnup as functions of temperature were calculated.