Verfahren zur Herstellung eines Kernbrennstoff enthaltenden Körpers und nach dem Verfahren hergestellter Körper

1,264,943. Nuclear fuel. UNITED KING- DOM ATOMIC ENERGY AUTHORITY. 19 April, 1971 [23 March, 1970], No. 14023/70. Heading G6C. A nuclear fuel body is made by coating fission product-retaining nuclear fuel particles with at least two layers of coating material, the outer layer being more readily deformable than the inner layer under pressure, and then pressing the particles so that the outer layer material substantially fills the interstices between the particles. In an example uranium dioxide particles coated with pyrolytic carbon and silicon carbide are further coated with two layers of a mixture of graphite powder and phenolformaldehyde resin, the outer layer having a higher proportion of resin. After heating and applying pressure in a die, the resin is polymerized and carbonized by heating to form a coherent mass of fuel particles dispersed uniformly in a graphite matrix. In other examples (a) the outer coating layer contains stearic acid as a lubricant/plasticizer; (b) the inner layer is polymerized before applying the outer layer; and (c) graphite powders of different particle size or origin are used in the two coating compositions. Reference has been directed by the Comptroller to Specifications 1,081,447 and 1,195,206.