Commissariat a L'energie Atomique

Compagnie Generale Des Matieres Nucleaires

Commissariat a L'energie Atomique Et Aux Energies Alternatives

Areva Nc

André Beres

Christophe Maillard

Stéphane Grandjean

Jérôme Rousselle

Method for coprecipitation (or simultaneous precipitation) of at least one actinide in oxidation state (IV) with at least one actinide in oxidation state (III), wherein: According to another embodiment, a solution i.e. mixture of actinide(s) in oxidation state (IV) and actinide(s) in oxidation state (III) is prepared and a solution containing oxalate ions and a singly charged cation is added to the said mixture of actinides in order to carry out the coprecipitation. Method for preparation of mixed compounds of actinides by calcining the precipitate which is obtained. These mixed oxides such as mixed oxides, carbides or nitrides can be used especially in the fabrication of nuclear fuel, in the fabrication of transmutation targets or for the stable packaging of nuclear materials.

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Saint Marcel d'Ardeche, France

André Beres