Patent Number: 
Section: claims

1. A sintered nuclear fuel pellet comprising nuclear fuel,wherein the sintered nuclear fuel pellet includes a burnable absorber consisting of one or more consolidated bodies,wherein the one or more consolidated bodies of the burnable absorber is inside of the nuclear fuel pellet,whereinthe one or more consolidated bodies is in the nuclear fuel pellet at a volume fraction of 2˜20 percent volume by the total volume of the nuclear fuel pellet,all of the one or more consolidated bodies do not comprise nuclear fuel, andall of the one or more consolidated bodies are located in a radially central region of the nuclear fuel pellet,such that all of the one or more consolidated bodies are surrounded by the nuclear fuel in all directions without the one or more consolidated bodies being exposed to an outside of the nuclear fuel pellet, andwherein only the radially central region includes burnable absorber material,such that area of the nuclear fuel pellet located outside of the radially central region is free of burnable absorber material. 2. The sintered nuclear fuel pellet according to claim 1, wherein either a combustion speed or self-shielding effect of the burnable absorber, or both are controlled by regulating a size, shape, or insertion location of the one or more consolidated bodies of the burnable absorber. 3. The sintered nuclear fuel pellet according to claim 1, wherein the one or more consolidated bodies of the burnable absorber includes Gd2O3; Er2O3; Gd2O3 stabilized with one or more selected from the group consisting of CeO2, In2O3, Y2O3, TiO2, ZrO2, Al2O3, and Y2O3-ZrO2 (yttria-stabilized zirconia); Er2O3 stabilized with one or more selected from the group consisting of CeO2, In2O3, Y2O3, TiO2, ZrO2, Al2O3, and Y2O3-ZrO2 (yttria-stabilized zirconia); or a combination thereof. 4. The sintered nuclear fuel pellet according to claim 3, wherein the CeO2, In2O3, Y2O3, TiO2, ZrO2, Al2O3, and Y2O3-ZrO2 are included in Gd2O3 and Er2O3 at a concentration of 1˜60 weight %. 5. A method of manufacturing a sintered nuclear fuel pellet comprising the following steps:forming one or more consolidated bodies of a burnable absorber;inserting the one or more consolidated bodies in nuclear fuel;forming a nuclear fuel-consolidated body composite by press-molding a mixture of the nuclear fuel and the one or more consolidated bodies; andforming a sintered nuclear fuel pellet by sintering the nuclear fuel-consolidated body composite,wherein the sintered nuclear fuel pellet includes the burnable absorber consisting of the one or more consolidated bodies,wherein the one or more consolidated bodies of the burnable absorber is inside of the nuclear fuel pellet,whereinthe one or more consolidated bodies is in the nuclear fuel pellet at a volume fraction of 2˜20 percent volume by the total volume of the nuclear fuel pellet,all of the one or more consolidated bodies do not comprise nuclear fuel, andall of the one or more consolidated bodies are located in a radially central region of the nuclear fuel pellet,such that all of the one or more consolidated bodies are surrounded by the nuclear fuel in all directions without the one or more consolidated bodies being exposed to an outside of the nuclear fuel pellet, andwherein only the radially central region includes burnable absorber material,such that area of the nuclear fuel pellet located outside of the radially central region is free of burnable absorber material. 6. The method of manufacturing according to claim 5, wherein the step of forming the one or more consolidated bodies of the burnable absorber comprises the following substeps:homogenizing and mixing burnable absorber powder; andpress-molding the mixed burnable absorber powder. 7. The method of manufacturing according to claim 6, wherein the step of press-molding the mixed burnable absorber powder comprisesa first press-molding at a pressure of 30 MPa˜100 MPa anda second press-molding at a pressure of 200 MPa˜500 MPa by a hydrostatic press (CIP). 8. The method of manufacturing according to claim 6,wherein the step of press-molding the mixed burnable absorber powder is performed once at a pressure of 100 MPa˜500 MPa. 9. The method of manufacturing according to claim 5, wherein the step of forming the one or more consolidated bodies of the burnable absorber comprises the following substeps:homogenizing and mixing burnable absorber powder; andinjecting the burnable absorber powder into a hole of a hollow green body of nuclear fuel, and pressing an inside of the hole. 10. The method of manufacturing according to claim 9, wherein the hollow green body of nuclear fuel includes one or more materials selected from the group consisting of CeO2, In2O3, Y2O3, TiO2, ZrO2, Al2O3, and Y2O3-ZrO2. 11. The method of manufacturing according to claim 9, wherein the step of pressing is performed by uniaxial pressing the inside of the hole at a pressure of 30 MPa˜100 MPa. 12. The method of manufacturing according to claim 9, wherein the hollow green body of nuclear fuel is in the shape of a ring or a tube, and a diameter of the hollow is 1˜3 mm. 13. The method of manufacturing according to claim 9, wherein the one or more consolidated bodies of the burnable absorber includes Gd2O3; Er2O3; Gd2O3 stabilized with one or more selected from the group consisting of CeO2, In2O3, Y2O3, TiO2, ZrO2, Al2O3, and Y2O3-ZrO2 (yttria-stabilized zirconia); Er2O3 stabilized with one or more selected from the group consisting of CeO2, In2O3, Y2O3, TiO2, ZrO2, Al2O3, and Y2O3-ZrO2 (yttria-stabilized zirconia); or a combination thereof. 14. The method of manufacturing according to claim 13, wherein the one or more selected from the group consisting of CeO2, In2O3, Y2O3, TiO2, ZrO2, Al2O3, and Y2O3-ZrO2 (yttria-stabilized zirconia) are included in Gd2O3 or Er2O3 at a concentration of 3˜30 weight %.