Patent Number: 051805278
Section: claims

1. Nuclear fuel pellets, consisting of: sintered grains of nuclear fuel substance having a continuous deposition phase in the grain boundaries of said sintered grains, said deposition phase consisting of beryllium oxide alone or a mixture of beryllium oxide and at least one other oxide selected from the group consisting of titanium, gadolinium, calcium, barium, magnesium, strontium, lanthanum, yttrium, ytterbium, silicon, aluminum, samarium, tungsten, zirconium, lithium, molybdenum, uranium and thorium, wherein the amount of beryllium oxide alone is 13.6 wt. % at maximum or wherein the amount of a mixture of beryllium oxide and said other oxides is 12.5 wt. % at maximum. 2. The nuclear fuel pellets of claim 1, wherein the amount of beryllium oxide is 1.5 wt. % at maximum. 3. The nuclear fuel pellets of claim 1, wherein said deposition phase consists of said mixture of beryllium oxide and at least one other oxide. 4. The nuclear fuel pellets of claim 1, wherein said deposition phase consists of beryllium oxide. 5. The nuclear fuel pellets of claim 1, wherein said deposition phase consists of beryllium oxide and titanium oxide. 6. The nuclear fuel pellets of claim 1, wherein said deposition phase consists of beryllium oxide and gadolinium oxide. 7. The nuclear fuel pellets of claim 1, wherein said deposition phase consists of beryllium oxide and silicon oxide. 8. The nuclear fuel pellets of claim 1, wherein said deposition phase consists of beryllium oxide and aluminum oxide. 9. The nuclear fuel pellets of claim 1, wherein said deposition phase consists of beryllium oxide, titanium oxide and gadolinium oxide.