Supercritical carbon dioxide reactor fuel assembly

Abstract

The invention discloses a supercritical carbon dioxide reactor fuel assembly, and solves the problem that a fuel assembly in the prior art cannot have stronger moderating power and be used in a high-temperature environment under the premise of reducing the volume. The supercritical carbon dioxide reactor fuel assembly comprises an upper pipe saddle, a fuel core and a lower pipe saddle sequentiallyarranged from top to bottom, wherein the fuel core comprises a moderator zone, a heat insulation and burnable poison zone and a fuel zone coaxially arranged from inside to outside; the moderator zoneis of a hexagonal prism structure; the heat insulation and burnable poison zone is of a hexagonal annular structure which sleeves the outer wall of the moderator zone; the fuel zone is of a hexagonalannular structure which sleeves the outer wall of the heat insulation and burnable poison zone; a moderator cooling hole is formed in the moderator zone; a fuel coolant hole is formed in the fuel zone; and supercritical carbon dioxide flows across the moderator cooling hole from top to bottom first, flows across the fuel coolant hole from bottom to top, and then is discharged. The supercritical carbon dioxide reactor fuel assembly has the advantages of small volume of a reactor core, strong moderating power, unrestricted operating environment, and the like.

Description

technical field [0001] The invention relates to the field of reactor fuel assemblies, in particular to a supercritical carbon dioxide reactor fuel assembly. Background technique [0002] The supercritical carbon dioxide reactor generally has a higher outlet temperature, and has higher requirements on the high temperature resistance of the fuel material. Fuels currently used in supercritical CO2 reactors are generally spherical or hexagonal prism-shaped fuels based on a graphite matrix. [0003] Among them, the hexagonal columnar fuel is generally inserted into the hexagonal columnar graphite matrix with through holes, and has the advantages of regular structure, easy core layout, and rich experience in the use of the stack. Due to the weak neutron moderation ability of the gas itself, the traditional thermal neutron supercritical carbon dioxide reactor needs to use graphite as moderator. However, the moderation ability of graphite itself is still weak, so a large volume of...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: the fuel assembly in the prior art cannot achieve the effect of having a stronger moderation ability and being able to be used in a high temperature environment under the premise of reducing the volume. The purpose of the present invention is to provide A supercritical carbon dioxide reactor fuel assembly, which can be used in a high-temperature environment while reducing its volume and improving its moderation capacity through a reasonable structural design

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