Fuel for pebble-bed HTRs

Abstract More than half a million spherical fuel elements with high-enriched uranium have been manufactured in Germany. Containing high-enriched uranium and thorium oxide fuels, many elements have been successfully tested in MTRs and in AVR under high temperatures. In 1979 the reference fuel cycle was changed to low-enriched uranium fuel. Design specifications both for coated particles and the fuel element were reviewed in the light of previous experience with high-enriched fuel. The LEU qualification programme is well under progress to be completed by 1985/86.