METHOD FOR FABRICATION OF THE PELLETS OF CERAMIC NUCLEAR FUEL, DEVICE FOR ITS REALIZATION AND CONTAINER Russian patent published in 2005 - IPC

FIELD: nuclear engineering.

SUBSTANCE: the invention may be used for obtaining a homogeneous nuclear fuel from a mixture of ceramic powders of fissile components and different additives for fast and thermal nuclear reactors. The proposed method ensures grinding and mixing of powders and achieving the required characteristics of the powder mixture, necessary for obtaining a homogeneous mixed nuclear fuel of different composition, for example, the fuel, containing the high-background regenerated plutonium or different additives in the quantity from 0.05 mass %. The method for fabrication of the pellets of ceramic nuclear fuel includes the stages of preparation of pressed powder, its granulation, compaction and sintering of the obtained pellets. The stage at pressed powder preparation includes the following operations: charging of the doses of powders of initial components and the substance, initiating the grinding, into the container from nonmagnetic material; hermetic sealing at the container displacement of the container with powder and ferromagnetic needles into the cavity of a nonmagnetic tube, located within the coil of an induction heater; grinding and mixing of the powders under the action of ferromagnetic needles, moving in the magnetic field of the induction heater; container withdrawal from the tube; container cooling; container depressurization and unloading at the obtained powder mixture from container into a granulator. The operating zone of a cylindrical shape, within the which the ferromagnetic needles are constantly placed, and the end zone, are formed in the container space. These zones are divided with a net partition, impenetrable for needles. Powder dose changing into the operating zone is realized through the end zone and net partition. Container is introduced into the tube space up to the height of the operating zone of container. The tube is located vertically within the induction heater coil. The powder treatment is carried out during needle motion in the operating zone. Unloading of the obtained powder mixture is carried out through the net partition and end zone without unloading of the ferromagnetic needles from the operating zone.

EFFECT: increased efficiency of fabrication of the ceramic nuclear fuel.

20 cl, 4 dwg, 2 ex