Method and equipment for the coating of fuel particles for nuclear reactors

The polyhedral structure of the coating of spherical fuel particles for e.g. gas cooled high temperature reactors is reduced. The particles are coated by the pyrolytic decomposition of hydrocarbon gases and/or chlorine methyl silanes at temperatures between 1,000 and 2,4000C in a fluidized bed furnace. The formation of slip layers, in which the coating is irregular, on the periphery of the fluidized bed is inhibited by the production of swirling movement of the fuel particles. In addition to this a slanting downward movement is forced upon the carrier gas introduced from the side in the fluidized bed tangential through the oven wall. Furthermore, the carrier gas from below can be spirally added to prevent middle slip layers. (HP/LH)