Reactor core and assembly type reactor core plate structure

Abstract

The present invention relates to a reactor core and an assembly type reactor core plate structure. The assembly type reactor core plate structure comprises a reactor core plate for carrying out coversealing on a fuel assembly in an annular space between the middle cylinder and the outer cylinder of a reactor core, wherein the reactor core plate comprises a first sub-plate and a second sub-plate,the first sub-plate and the second sub-plate are spliced between the middle cylinder and the outer cylinder, and are rotatably arranged around the middle cylinder and between the middle cylinder and the outer cylinder, the second sub-plate can move axially along the middle cylinder, and after the second sub-plate moves axially, and rotates relative to the first sub-plate, a refueling channel is formed. According to the present invention, the assembly type reactor core plate structure can provide the stable axial restraint to the fuel assembly and cannot affect the refueling of the fuel assembly so as to simultaneously meet the functions of refueling and fuel assembly constraining.

Description

technical field [0001] The invention relates to the technical field of nuclear power, and more specifically relates to a core and an assembled core plate structure. Background technique [0002] Fast reactors generally adopt a pool structure, and fuel assemblies are placed in pools filled with metal coolants (such as lead-bismuth coolant). Because the lead-bismuth coolant produces toxic substances, closed reactors are generally used to ensure safety. [0003] The traditional reactor core plate is usually a complete flat plate with circular and square flow passages on it. In the limited space of a closed reactor, the traditional core plate structure cannot be moved or transferred to the outside of the core, which will block the refueling channel of the fuel assembly. Therefore, no upper core plate (or lower core plate) is often used in a closed reactor core plate) to solve the problem of fuel assembly refueling. [0004] However, for a core design without an upper core pla...

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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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