Abstract

Thermodynamic simulation demonstrated that the accumulation of fission products in irradiation of a uranium-plutonium nitride with admixture of carbon and oxygen (U_0.8Pu_0.2)(N_0.9475O_0.02625C_0.02625) results in that a multicomponent oxycarbonitride solid solution is formed. This solid solution contains U, Pu,Am, Np, Zr, Y, and lanthanides as well as separate oxide (BaUO₃, SrPuO₃), carbide (URu₃C_0.7, Mo₂C), and nitride (U₂N₃) phases and intermetallides U(Rh,Pd)₃. The β^– decay of metallic radionuclides in separate oxide and carbide phases of spent nuclear fuel changes their chemical and phase compositions, The transformation kinetics of separate phases ⁹⁹Mo₂C → 1/³⁹⁹Tc₆C + 2/3 C, ¹⁴⁰BaUO₃ →1/2¹⁴⁰Ce₂UO₆ + 1/2U was calculated.

中文翻译：

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碳，氧杂质和某些裂变产物的β分解共同作用下辐照的铀-氮化N相组成的比较分析

摘要

热力学模拟表明，在铀和氮化nitride碳和氧（U _0.8 Pu _0.2）（N _0.9475 O _0.02625 C _0.02625）的混合辐射下，裂变产物的积累导致形成多组分碳氮氧化物固溶体。该固溶体包含U，Pu，Am，Np，Zr，Y和镧系元素以及单独的氧化物（BaUO ₃，SrPuO ₃），碳化物（URu ₃ C _0.7，Mo ₂ C）和氮化物（U ₂ N ₃）相和金属间化合物U（Rh，Pd）₃。在β ^-乏核燃料分离的氧化物和碳化物相中金属放射性核素的衰变改变了它们的化学和相组成，分离相的转化动力学⁹⁹ Mo ₂ C→1/ ³⁹⁹ Tc ₆ C + 2/3 C，¹⁴⁰ BaUO ₃ →1 /计算出2 ¹⁴⁰ Ce ₂ UO ₆ + 1 / 2U。