Preparation of Np, Pu, and U dioxides in nitric acid solutions in the presence of hydrazine hydrate

Author： Myasoedov B.   Kulyako Yu.   Fedoseev A.   Bessonov A.   Trofimov T.   Perevalov S.   Vinokurov S.   Samsonov M.   Shadrin A.  

Publisher： MAIK Nauka/Interperiodica

ISSN： 1066-3622

Source： Radiochemistry, Vol.55, Iss.6, 2013-11, pp. : 574-580

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Abstract

Heating of nitric acid solutions of Np and Pu (∼90°C) in the presence of hydrazine hydrate (HH) leads to the formation of their hydrated dioxides in solution, transforming into crystalline dioxides at 300°C. Thermolysis of a mixed solution of U, Np, and Pu nitrates under the same conditions initially yields hydrated (U,Np,Pu)O2·nH2O, which on heating in air to ∼300°C transforms into a crystalline solid solution of (U,Np,Pu)O2. This method for stabilization of U dioxide in the presence of Pu in an oxidizing atmosphere can be used for preparing (U,Pu)O2 solid solutions of variable composition. This procedure shows doubtless prospects as a simple, efficient, and relatively low-temperature method for the production of MOX fuel for fast reactors.

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