Patent Number: 
Section: claims

1. An assembly in a primary circuit of a nuclear reactor, wherein the nuclear reactor has a reactor core with defined fuel assembly positions for a placement of fuel assemblies, the assembly comprising:a device for removing solid particles from a cooling medium circulating in the primary circuit, said device not being a fuel assembly, but said device having a device outline with geometric dimensions and shapes configured for insertion thereof into an empty fuel assembly position in the reactor core of the nuclear reactor instead of a fuel assembly;a carrying structure extending in a longitudinal direction and at least one separator disposed in said carrying structure, said at least one separator being a flow separator, said flow separator having a deflection device configured for imparting centrifugal forces onto the solid particles and driving the solid particles into calm zones of said flow separator provided as accumulation spaces. 2. The assembly according to claim 1, wherein said at least one separator is one of a plurality of separators disposed one after another in the longitudinal direction in said carrying structure. 3. The assembly according to claim 2, wherein said separators are releasably connected to one another. 4. The assembly according to claim 1, wherein said carrying structure is a hollow case. 5. The assembly according to claim 1, wherein said at least one separator is an insert configured for insertion into said carrying structure, said insert is formed with an inlet opening for the cooling medium, and has, opposite and at a spacing distance from said inlet opening, a deflection device for deflecting the cooling medium, and is formed with an accumulation zone for collecting the solid particles that are separated during deflection due to a centrifugal force. 6. The assembly according to claim 5, wherein said deflection device is a cyclone disposed to impart on the cooling medium, which flows in the longitudinal direction inside said carrying structure, a circular motion about the longitudinal direction. 7. The assembly according to claim 6, wherein said deflection device includes at least one fixed guide vane. 8. The assembly according to claim 1, wherein said separator is one of a plurality of separators disposed one after another in the longitudinal direction and having mutually different designs from one another in order to achieve a different separation effect. 9. The assembly according to claim 1, configured to have a flow resistance substantially corresponding to a flow resistance of a fuel assembly. 10. The assembly according to claim 1, configured for insertion into the reactor core of a boiling-water nuclear reactor. 11. A reactor core of a nuclear reactor, comprising an assembly according to claim 1 inserted into an empty fuel assembly position. 12. The reactor core according to claim 11, configured as a core of a boiling-water reactor. 13. The reactor core according to claim 11, wherein said device is inserted in a fuel assembly position is located at an edge of a fuel assembly grid. 14. The reactor core according to claim 11, wherein said device is inserted in a corner position of a fuel assembly grid.