Method for sulphurizing a UO₂ powder and method for making nuclear fuel pellets based on UO₂ or mixed oxide (U,Pu)O₂ oxide with added sulphur

摘要

Sulphidation method for a UO₂ powder, 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 UO₂ powder or UO₂ powder and PuO₂ powder, 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 UO₂ powder by the above sulphidation method;optionally mixing, said sulfurated powder in a matrix comprising a UO₂ powder, or of a UO₂ powder and a PuO₂ powder;and, subjecting said load, formed from said sulfurated powder or said mixture, to lubrication, pelletizing and sintering operations.