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The proposed steam turbine rotor extends along an axial extent and includes: an outer side which adjoins an outer space which is intended to receive a main flow of a fluid working medium, a first location along the outer side, at which a first blade is held, a second location along the outer side, a

The proposed steam turbine rotor extends along an axial extent and includes: an outer side which adjoins an outer space which is intended to receive a main flow of a fluid working medium, a first location along the outer side, at which a first blade is held, a second location along the outer side, at which a second blade is held, the second location being arranged behind the first location along the axial extent. To ensure sufficient cooling, there is at least one integrated passage, which extends continuously at least between a first region arranged in front of the first location and a second region arranged behind the second location The invention proposes a method and a use in which a fluid cooling medium is guided in a corresponding way.

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Then invention claimed is: 1. A steam turbine rotor extending along an axial extent comprising: an outer side adjoining an outer space arranged to receive a main flow of a fluid working medium, wherein the outer side is formed by a shielding plate which can rotate with the rotor; a first location a

Then invention claimed is: 1. A steam turbine rotor extending along an axial extent comprising: an outer side adjoining an outer space arranged to receive a main flow of a fluid working medium, wherein the outer side is formed by a shielding plate which can rotate with the rotor; a first location arranged along the outer side, at which a first blade is held; and at least one integrated passage extending continuously at least between a first region arranged in front of the first location and a second region arranged behind the first location, wherein a cooling medium is provided and guided at a pressure that is modified as a function of a pressure of the main flow. 2. The steam turbine rotor as claimed in claim 1, wherein a second location arranged along the outer side, at which a second blade is held, the second location arranged behind the first location along the axial extent and the passage extending continuously at least between a first region arranged in front of the first location and a second region arranged behind the second location. 3. The steam turbine rotor as claimed in claim 2, wherein a number of further locations, at each of which a blade is held, are arranged between the first location and the second location. 4. The steam turbine rotor as claimed in claim 1, wherein the at least one passage is part of a combined passage system which extends along the axial extent. 5. The steam turbine rotor as claimed in claim 1, wherein the at least one passage is part of a combined passage system which has an external feed which is provided for the incoming flow of cooling medium. 6. The steam turbine rotor as claimed in claim 1, wherein the at least one passage is part of a combined passage system which includes a channel which at least partially encircles a circumferential extent of the rotor. 7. The steam turbine rotor as claimed in claim 1, wherein the first region has a first opening to the main flow. 8. The steam turbine rotor as claimed in claim 1, wherein the second region has a second opening to the main flow. 9. The steam turbine rotor as claimed in claim 1 wherein a shield for the rotor shaft with respect to the main flow of the steam is at least partially formed by a blade root. 10. The steam turbine rotor as claimed in claim 1, wherein the shielding plate which can rotate with the rotor is held by a blade. 11. The steam turbine rotor as claimed in claim 1, wherein the passage leads through a blade, in particular through a blade root. 12. The steam turbine rotor as claimed in claim 1, further comprising a groove at a blade root, which groove is part of the passage. 13. The steam turbine rotor as claimed in claim 1, further comprising a bore through a single blade root and/or a bore through two adjacent blade roots, which bore is part of the passage. 14. The steam turbine rotor as claimed in claim 1, wherein a thermally insulating coating made from a material which has a lower heat conduction coefficient than a base material of the blade is provided on a blade surface. 15. A steam turbine rotor extending along an axial extent comprising: an outer side adjoining an outer space arranged to receive a main flow of a fluid working medium; a first location arranged along the outer side, at which a first blade is held; at least one integrated passage extending continuously at least between a first region arranged in front of the first location and a second region arranged behind the first location, a channel in a main blade part, which channel is connected to the passage and permits axial flow directly from the first region to the second region; and wherein a cooling medium is provided and guided at a pressure that is modified as a function of a pressure of the main flow. 16. A method for actively cooling a steam turbine rotor extending along an axial extent and having an outer side, which adjoins an outer space which is intended to receive a main flow of a fluid working medium and having a first location along the outer side, at which a first blade is held, comprising: providing a fluid cooling medium; and guiding the fluid cooling medium continuously within the steam turbine rotor along the axial extent, at least between a first region arranged in front of the first location and a second region arranged behind the first location, wherein the method is used for starting up and/or running down a steam turbine. 17. The method for actively cooling a steam turbine rotor as claimed in claim 16, wherein the steam turbine rotor has a second location along the outer side, at which a second blade is held, the second location arranged behind the first location along the axial extent, and the fluid cooling medium guided continuously at least between a first region arranged in front of the first location and a second region arranged behind the second location. 18. The method for actively cooling a steam turbine rotor as claimed in claim 17, further comprising: guiding the cooling medium in a combined passage system along the axial extent over the first location and the second location and a number of intervening further locations, at each of which a blade is held. 19. The method for actively cooling a steam turbine rotor as claimed claim 16, further comprising: feeding the cooling medium to the steam turbine rotor from the outside. 20. The method for actively cooling a steam turbine rotor as claimed in claim 16, further comprising: guiding the cooling medium at a pressure which exceeds a pressure of the main flow. 21. The method for actively cooling a steam turbine rotor as claimed in claim 16, further comprising: guiding the cooling medium at a pressure which is modified as a function of a pressure of the main flow. 22. The method for actively cooling a steam turbine rotor as claimed in claim 16, further comprising: supplying the cooling medium at a temperature and/or in an amount which is/are modified as a function of a temperature of the main flow.