Patent Number: 
Section: claims

1. A method for fabricating nuclear fuel pellets, the method comprising:preparing mixture powder by mixing additive powder comprising MnO and Al2O3 with UO2 powder;compacting the mixture powder to produce green pellets; andsintering the green pellets at a temperature of 1,600° C. to 1,800° C. under a reducing gas atmosphere,wherein when the mixture powder of the additive powder and the UO2 powder is prepared, the additive powder is mixed with UO2 powder in such a way that the (MnO +Al2O3)/UO2 ratio in the mixture powder is 57.17 μg/g to 4205.70 μg/g, and the MnO/Al2O3 ratio of the additive powder is 0.68 to 68.26 by weight, and wherein the melting point of the additive powder is below 1,800° C. 2. The method of claim 1, wherein, in sintering the green pellets, the reducing gas atmosphere is a hydrogen-containing gas atmosphere. 3. The method of claim 2, wherein the hydrogen-containing gas is hydrogen-containing mixture gas, which contains hydrogen gas and at least one selected from the group consisting of carbon dioxide, water vapor and inert gas. 4. The method of claim 2, wherein the hydrogen-containing gas is hydrogen gas.