Fuel assembly, and lower tube seat and bottom device thereof

Abstract

The invention belongs to the technical field of reactor engineering, and concretely relates to a fuel assembly, and a lower tube seat and a bottom device thereof. The lower tube seat comprises a lowertube seat frame body, support legs arranged at the lower portion of the lower tube seat frame body, a plurality of equal-diameter through holes arranged in the upper end surface of the lower tube seat frame body in a crisscrossed parallel manner, a plugging hole for the lower end of a neutron flux tube, and plugging holes for the lower ends of guiding tubes; and the equal-diameter through holes are circular. The bottom device comprises the lower tube seat and a foreign body-resistant assembly connected thereto, and the lower tube seat is the lower tube seat in any claim of the description. The fuel assembly includes an upper tube seat, fuel rods, positioning grids, guiding tubes, an instrument tube and the bottom device; the fuel rods, the guiding tubes and the instrument tube are inserted into the positioning grids; the quantity of the positioning grids is more than one, and the positioning grids are sequentially arranged axially; the upper ends of the guiding tubes and the instrument tube are fixedly connected with the upper tube seat, and the lower ends of the guiding tubes and the instrument tube are fixedly connected with the bottom device; the bottom device further comprisesthe lower tube seat and the foreign body-resistant assembly; and the lower tube seat is the lower tube seat in any claim of the description.

Description

technical field [0001] The invention belongs to the technical field of reactor engineering, and in particular relates to a fuel assembly, its lower pipe seat and the bottom device of the fuel assembly. Background technique [0002] Usually, nuclear fuel is designed as a solid cylinder, consisting of upper and lower end plugs, pellets, compression springs and cladding. Coolant flows through the cladding to cool the fuel rods. The annular fuel is clad with two layers of inner and outer layers, and the coolant can simultaneously take away the heat emitted by the fuel from both the inner and outer sides. [0003] The bottom device of the fuel assembly is located at the bottom of the fuel assembly, including the lower pipe seat and the anti-foreign object assembly. The lower pipe seat is provided with coolant flow holes for the circulation of cooling water and the flow distribution of the coolant. The anti-foreign object assembly can To intercept foreign matter that may be conta...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a fuel assembly, its lower nozzle base and the bottom device of the fuel assembly, to solve the technical problem that the fuel assembly lower nozzle in the prior art is insufficient in the application of fuel assemblies

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