Pages: 3 - 10

Authors: Vladimir N. PRUSAKOV, Yury A. TETERIN, Nikolai M. TROTSENKO, Konstantin I. MASLAKOV, Anton Yu. TETERIN, Kirill E. IVANOV, Filipp S. BOCHAGIN, Dmitry V. UTROBIN

Abstract

Nuclear fuel reprocessing by fluorination, a dry method of regeneration of spent nuclear fuel, uses UO₂F₂ for the separation of plutonium from gaseous mixtures. Since plutonium requires special treatment, IrF₆ was used as a thermodynamic model of PuF₆. The model reaction of the interaction of gaseous IrF₆ with fine UO₂F₂ in the sorption column revealed a change of color of the sorption column contents from pale-yellow to grey and black, indicating the formation of products of such an interaction. The X-ray photoelectron spectroscopy study showed that the interaction of gaseous IrF₆ with fine UO₂F₂ at 125 °C results in the formation of stable iridium compounds where the iridium oxidation state is close to Ir³⁺. The dependence of the elemental compositions of the layers in the sorption column on the penetration depth of IrF₆ was established.

Key words: X-ray photoelectron spectroscopy, uranyl fluorite, iridium hexafluoride, technology of isolation of actinides from gas mixtures

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