Fuel assembly, and lower tube seat and bottom device thereof

A fuel assembly and bottom device technology, applied in the field of reactor engineering, can solve the problem of insufficient lower tube seat of the fuel assembly, and achieve the effects of improving fuel safety, reducing requirements, and increasing lateral flow
CN109935362APending Publication Date: 2019-06-25CHINA INSTITUTE OF ATOMIC ENERGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA INSTITUTE OF ATOMIC ENERGY
Publication Date
2019-06-25

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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.
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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...

Claims

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