Process for the production of nuclear fuel pellets based on mixed (U, Pu)O.sub.2 oxide with the addition of an organic, sulphur product
AssigneesCommissariat a l'Energie Atomique, Compagnie Generale des Matieres Nucleaires
InventorsMireille Bauer, Yves Marc, Danielle DeMarc, Monique Seiss
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Abstract
Process for the production of nuclear fuel pellets based on mixed uranium and plutonium oxide having a specific plutonium content from a charge of UO.sub.2 and PuO.sub.2 powders by lubrification, pelletizing and sintering, in which a solid, sulphur, organic additive of the zwitterion type is incorporated into the mixture during the co-milling stage for the powders.
Claims26
Process for the production of nuclear fuel pellets based on mixed uranium and plutonium oxide having a specified plutonium content, from a UO.sub.2 and PuO.sub.2 powder charge by lubrification, pelletizing and sintering, in which the powder charge subject to lubrification, pelletizing and sintering is prepared by the following successive stages:
- a) dosing a first mixture of UO.sub.2 and PuO.sub.2 powders having a plutonium content higher than the specified content, an organic, solid, sulphur product being incorporated into the mixture,
- b) milling said first mixture of powders,
- c) forced screening of said milled mixture through a screen having openings with a size equal to or smaller than 250 .mu.m,
- d) addition of a UO.sub.2 powder to said first mixture of milled powders to obtain a second mixture of powders having the specified plutonium content and
- e) mixing the complete charge for collecting the powder charge which is to undergo the lubrification, pelletizing and sintering operations, characterized in that the solid, organic, sulphur product incorporated into the mixture during stage a) is a zwitterion and in that stage e) of mixing the charge is a simple stirring operation.
Process for the production of nuclear fuel pellets based on mixed uranium and plutonium oxide having a specified plutonium content, from a UO.sub.2 and PuO.sub.2 powder charge by lubrification, pelletizing and sintering, in which the powder charge subject to lubrification, pelletizing and sintering is prepared by the following successive stages:
- a) dosing a first mixture of UO.sub.2 and PuO.sub.2 powders having the specified plutonium content, an organic, solid, sulphur product being incorporated into the mixture,
- b) milling said first mixture of powders, characterized in that the solid, organic, sulphur product incorporated into the mixture during stage a) is a zwitterion.
Dependencies are inferred from the claim text.