Patent Number: 
Section: claims

1. A uranium dioxide nuclear fuel pellet comprising:uranium dioxide grains; and micro-partitions partitioning and contacting the uranium dioxide grains,wherein the micro-partitions consist essentially of a ceramic material that melts in a temperature range of 1200-1800° C.,wherein the ceramic material is a mixture comprising two or more selected from the group consisting of Si-compounds, Ti-compounds, Al-compounds, Mg-compounds, and Mn-compounds, andwherein the mixture further comprises the Ti-compounds in an amount of at least 37.08 wt % or the Mn-compounds in an amount of 14.0 wt %. 2. The uranium dioxide nuclear fuel pellet of claim 1, further comprising:metallic particles dispersed in the uranium dioxide grains and configured to react with oxygen more easily than uranium dioxide does. 3. The uranium dioxide nuclear fuel pellet according to claim 2, wherein the metallic particles comprise Cr or Mo. 4. The uranium dioxide nuclear fuel pellet according to claim 2, wherein an average size of the metallic particles is about 0.3 μm to about 10 μm. 5. The uranium dioxide nuclear fuel pellet according to claim 1, wherein the micro-partitions define a plurality of microcells, wherein each of at least some of the microcells contains a single grain of uranium oxide. 6. The uranium dioxide nuclear fuel pellet according to claim 1, wherein one of the micro-partitions is located between two immediately neighboring grains of the uranium dioxide grains and contacts the two immediately neighboring grains.