초록 ▼

A method of manufacturing new UO.sub.2 -based fuel pellets by recycling irradiated UO.sub.2 -based fuel pellets. Irradiated UO.sub.2 -based fuel pellets are oxidized so as to make U.sub.3 O.sub.8 -based powder, and then the U.sub.3 O.sub.8 -based powder is mixed with an additive which contains at le

A method of manufacturing new UO.sub.2 -based fuel pellets by recycling irradiated UO.sub.2 -based fuel pellets. Irradiated UO.sub.2 -based fuel pellets are oxidized so as to make U.sub.3 O.sub.8 -based powder, and then the U.sub.3 O.sub.8 -based powder is mixed with an additive which contains at least one oxide of an element selected from the group consisting of niobium, titanium, vanadium, aluminum, magnesium, chromium, silicon and lithium. Green pellets are formed from the mixed powder, and then sintered, preferably at 1500.degree. C. or higher, in a reducing gas atmosphere to produce UO.sub.2 -based fuel pellets with high densities.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of producing a UO.sub.2 -based fuel pellet from an irradiated UO.sub.2 -based fuel pellet, the method comprising:heating an irradiated UO.sub.2 -based fuel pellet in an oxidizing gas, to produce a U.sub.3 O.sub.8 -based product,mixing the U.sub.3 O.sub.8 -based

[ What is claimed is:] [1.]1. A method of producing a UO.sub.2 -based fuel pellet from an irradiated UO.sub.2 -based fuel pellet, the method comprising:heating an irradiated UO.sub.2 -based fuel pellet in an oxidizing gas, to produce a U.sub.3 O.sub.8 -based product,mixing the U.sub.3 O.sub.8 -based product with an additive comprising at least one oxide of an element selected from the group consisting of Nb, Ti, V, Al, Mg, Cr, Si and Li, to produce a mixture,pressing the mixture into a green pellet, andsintering the green pellet in a reducing gas atmosphere to reduce the U.sub.3 O.sub.8 -based product to a UO.sub.2 -based product.