Core and assembled core plate structure

Abstract

A reactor core and an assembled core plate structure. The assembled core plate structure comprises a core plate for capping a fuel assembly in an annular space between a central tube (1) and an outer tube (2) of the reactor core. The core plate comprises a first sub-plate (3) and a second sub-plate (4) spliced between the center tube (1) and the outer tube (2). The first sub-plate (3) and the second sub-plate (4) are rotatably disposed around the center tube (1) between the center tube (1) and the outer tube (2). The second sub-plate (4) is movable in the axial direction along the center tube (1). When the second sub-plate (4) moves in the axial direction and rotates with respect to the first sub-plate (3), a refueling passage (5) is formed. The assembled core plate structure provides stable axial restraint for the fuel assembly without affecting the refueling of the fuel assembly, and achieves the functions of refueling and restraining the fuel assembly.

Description

Technical field [0001] The present invention relates to the technical field of nuclear power, and more particularly, to a core and a core plate assembled structure. Background technique [0002] Fast reactors generally use cell structure, the fuel assembly is filled in the coolant metal (e.g. lead-bismuth coolant) pool. Since the lead-bismuth coolant produce toxic substances, using a closed reactor to ensure the safety in general. [0003] Conventional reactor core plate is generally a full plate, on which a circular opening and a rectangular flow passage. In the limited space in a closed reactor, the structure of a conventional core plate can not be moved or transferred to the outside of the core, and thus blocks the passage of the fuel assembly refueling, so a supreme core plate (or the stack in a closed reactor often Xinban) to solve the problem of refueling the fuel assembly. [0004] But for the core design supreme core plate (or the lower core plate), the fuel assemblies in...

AI Technical Summary

Problems solved by technology

[0004] However, for a core design without an upper core plate (or a lower core plate), the fuel assembly cannot maintain self-support only by its own weight in the event of earthquakes and other working conditions, and other special designs are required to solve the problem. Anti-seismic Problems of Fuel Assembly

[0005] Therefore, the current core plate structure design has a contradiction between the axial fixing function of the fuel assembly and the function of providing refueling channels.

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