Patent Number: 
Section: claims

1. A method for configuring nuclear power plant fuel elements/assemblies jointly, comprising steps for configuring fuel elements/assemblies jointly between at least one operating unit and at least one new starting unit with a first reactor core:(S1) adding at least one new fuel element/assembly to the at least one operating unit according to an equilibrium cycle or transition cycle reactor core configuration design;(S2) after running a fuel cycle, obtaining spent fuel elements/assemblies having burned once from the at least one operating unit based on an amount of added new fuel elements/assemblies loaded in step (S1), and keeping said spent fuel elements/assemblies for further use, wherein, an amount of the spent fuel elements/assemblies having burned once from the at least one operating unit is larger than that of the spent fuel elements/assemblies obtained in the equilibrium cycle or transition cycle reactor core configuration design;(S3) putting a scheduled number of new fuel elements/assemblies, and the spent fuel elements/assemblies having burned once which are obtained from step (S2) in the first reactor cores of the at least one new starting unit. 2. The method for configuring nuclear power plant fuel elements/assemblies jointly of claim 1, between the steps (S2) and (S3), further comprising storage of the spent fuel elements/assemblies having burned once which are obtained from step (S2) in a spent fuel pool or spent fuel storage container, which storage satisfies requirements of safe transporting after storage. 3. The method for configuring nuclear power plant fuel elements/assemblies jointly of claim 2, wherein, the step (S3) also comprises arranging a scheduled number of spent fuel elements/assemblies having burned twice into the first reactor core of the at least one new starting unit. 4. The method for configuring nuclear power plant fuel elements/assemblies jointly of claim 2, wherein, in step (S1), one to twenty-nine new fuel assemblies are added to the at least one operating unit according to the equilibrium cycle or transition cycle reactor core configuration design. 5. The method for configuring nuclear power plant fuel elements/assemblies jointly of claim 2, wherein, there are several operating units which comprise long-term and short-term operating units; and there are steps for configuring fuel elements/assemblies among the long-term and short-term operating units:(B1) based on reactor cores configuration design of a long-term equilibrium cycle or transition cycle, the spent fuel elements/assemblies having burned once which are arranged in peripheral places of the long-term operating units are replaced by the spent fuel elements/assemblies having burned twice, so as to obtain remain spent fuel elements/assemblies having burned once for further use;(B2) the remain spent fuel elements/assemblies having burned once for further use and the spent fuel elements/assemblies in the long-term operating units are arranged in the short-term operating units;the long-term operating units refuel every 18 months or every 24 months; the short-term operating units refuel every quarter or third year. 6. The method for configuring nuclear power plant fuel elements/assemblies jointly of claim 1, wherein, the arrangement of the first reactor core of the at least one new starting unit is based on a refueling mode in which the at least one operating units add the new fuel elements/assemblies. 7. The method for configuring nuclear power plant fuel elements/assemblies jointly of claim 6, wherein, the step (S3) also comprises arranging a scheduled number of spent fuel elements/assemblies having burned twice into the first reactor core of the at least one new starting unit. 8. The method for configuring nuclear power plant fuel elements/assemblies jointly of claim 6, wherein, in step (S1), one to twenty-nine new fuel assemblies are added to the at least one operating unit according to the equilibrium cycle or transition cycle reactor core configuration design. 9. The method for configuring nuclear power plant fuel elements/assemblies jointly of claim 6, wherein, there are several operating units which comprise long-term and short-term operating units; and there are steps for configuring fuel elements/assemblies jointly among the long-term and short-term operating units:(B1) based on reactor cores configuration design of a long-term equilibrium cycle or transition cycle, the spent fuel elements/assemblies having burned once which are arranged in peripheral places of the long-term operating units are replaced by the spent fuel elements/assemblies having burned twice, so as to obtain remain spent fuel elements/assemblies having burned once for further use;(B2) the remain spent fuel elements/assemblies having burned once for further use and the spent fuel elements/assemblies in the long-term operating units are arranged in the short-term operating units;the long-term operating units refuel every 18 months or every 24 months; the short-term operating units refuel every quarter or third year. 10. The method for configuring nuclear power plant fuel elements/assemblies jointly claim 1, wherein, the spent fuel elements/assemblies having burned once and the new fuel elements/assemblies are arranged in alternation order in the reactor core of the at least one operating unit or in the first reactor core of the new starting unit, such that the new fuel elements/assemblies are arranged around the spent fuel elements/assemblies having burned once. 11. The method for configuring nuclear power plant fuel elements/assemblies jointly of claim 10, wherein, the step (S3) also comprises arranging a scheduled number of spent fuel elements/assemblies having burned twice into the first reactor core of the at least one new starting unit. 12. The method for configuring nuclear power plant fuel elements/assemblies jointly of claim 10, wherein, in step (S1), one to twenty-nine new fuel assemblies are added to the at least one operating unit according to the equilibrium cycle or transition cycle reactor core configuration design. 13. The method for configuring nuclear power plant fuel elements/assemblies jointly of claim 10, wherein, there are several operating units which comprise long-term and short-term operating units; and there are steps for configuring fuel elements/assemblies jointly among the long-term and short-term operating units:(B1) based on reactor cores configuration design of a long-term equilibrium cycle or transition cycle, the spent fuel elements/assemblies having burned once which are arranged in peripheral places of the long-term operating units are replaced by the spent fuel elements/assemblies having burned twice, so as to obtain remain spent fuel elements/assemblies having burned once for further use;(B2) the remain spent fuel elements/assemblies having burned once for further use and the spent fuel elements/assemblies in the long-term operating units are arranged in the short-term operating units;the long-term operating units refuel every 18 months or every 24 months; the short-term operating units refuel every quarter or third year. 14. The method for configuring nuclear power plant fuel elements/assemblies jointly of claim 1, wherein, the step (S3) also comprises arranging a scheduled number of spent fuel elements/assemblies having burned twice into the first reactor core of the at least one new starting unit. 15. The method for configuring nuclear power plant fuel elements/assemblies jointly of claim 1, wherein, in step (S1), one to twenty-nine new fuel assemblies are added to the at least one operating unit according to the equilibrium cycle or transition cycle reactor core configuration design. 16. The method for configuring nuclear power plant fuel elements/assemblies jointly of claim 1, wherein, 1, 4, 5, 8, 9, 12, 13, 16, 17, 20, 21, 24, 25, 28 or 29 new fuel assemblies are added to the at least one operating unit. 17. The method for configuring nuclear power plant fuel elements/assemblies jointly of claim 1, wherein, in step (S1), reactor cores of the at least one operating unit have 157 fuel assemblies;in step (S3), the first reactor cores of the at least one new starting unit comprise eighty to one hundred new fuel assemblies, thirty to forty-nine spent fuel assemblies having burned once and spent fuel assemblies having burned twice loaded in the rest places. 18. The method for configuring nuclear power plant fuel elements/assemblies jointly of claim 1, wherein, there are several operating units which comprise long-term and short-term operating units; and there are steps for configuring fuel elements/assemblies jointly among the long-term and short-term operating units:(B1) based on reactor cores configuration design of a long-term equilibrium cycle or transition cycle, the spent fuel elements/assemblies having burned once which are arranged in peripheral places of the long-term operating units are replaced by the spent fuel elements/assemblies having burned twice, so as to obtain remain spent fuel elements/assemblies having burned once for further use;(B2) the remain spent fuel elements/assemblies having burned once for further use and the spent fuel elements/assemblies in the long-term operating units are arranged in the short-term operating units;the long-term operating units refuel every 18 months or every 24 months; the short-term operating units refuel every quarter or third year. 19. The method for configuring nuclear power plant fuel elements/assemblies jointly of claim 1, wherein, the new fuel elements/assemblies and the new fuel elements/assemblies used in the equilibrium cycle has same enrichments.