Method for sulfurizing UO2 powder and method for producing nuclear fuel pellets based on UO2 or mixed oxide (U, Pu) O2 based on addition of sulfur

摘要

Sulphidation method for a UOSUB2 /SUBpowder, in which said powder is sulfurated by bringing it into contact with a gaseous sulphidation agent. Method for manufacturing nuclear fuel pellets based on uranium oxide, or mixed oxide of uranium and plutonium, from a load of totally or partially sulfurated UOSUB2 /SUBpowder or UOSUB2 /SUBpowder and PuOSUB2 /SUBpowder, by lubrication, pelletizing and sintering, in which: the load of powder subjected to the lubrication, pelletizing and sintering is prepared by the following successive steps: sulphidation of a UOSUB2 /SUBpowder by the above sulphidation method; optionally mixing, said sulfurated powder in a matrix comprising a UOSUB2 /SUBpowder, or of a UOSUB2 /SUBpowder and a PuOSUB2 /SUBpowder; and, subjecting said load, formed from said sulfurated powder or said mixture, to lubrication, pelletizing and sintering operations.