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Fuel assembly, bottom device thereof, and lower tube seat applied to bottom device

A fuel assembly and bottom device technology, which is applied in the field of reactor engineering, can solve problems such as insufficient tube sockets under the fuel assembly, and achieve the effects of lowering temperature, enhancing safety, and enhancing heat transfer effects

Pending Publication Date: 2019-06-25
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Fuel assembly, bottom device thereof, and lower tube seat applied to bottom device
  • Fuel assembly, bottom device thereof, and lower tube seat applied to bottom device
  • Fuel assembly, bottom device thereof, and lower tube seat applied to bottom device

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specific Embodiment

[0041] like Figures 1 to 5 As shown, a lower nozzle base of a fuel assembly includes: a lower nozzle frame body 11, a leg 12 arranged at the lower part of the lower nozzle frame body 11, and several vertically and horizontally arranged in parallel on the upper end surface of the lower nozzle frame body 11 The equal diameter through hole 15, the neutron measuring tube hole 16 and the lower end plug hole 17 of the guide tube; it is characterized in that the equal diameter through hole 15 is circular.

[0042] The maximum difference between the inner diameter and the outer diameter of the equal-diameter through hole 15 ranges from 0.05 to 0.4 mm.

[0043] A rectangular mainstream water hole A111 is provided at the center of the rectangle surrounded by the four adjacent equal-diameter through holes 15; several mainstream water holes B112 are provided around the plug hole 17 at the lower end of each guide tube and the neutron measuring tube hole 16.

[0044] The main water hole B...

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Abstract

The invention belongs to the technical field of reactor engineering, and concretely relates to a fuel assembly, a bottom device thereof, and a lower tube seat applied to the bottom device. The lower tube seat comprises a lower tube seat frame body, support legs arranged at the lower portion of the lower tube frame body, a plurality of equal-diameter through holes arranged in the upper end surfaceof the lower tube seat frame body in a crisscrossed parallel manner, a tap hole for the lower end of a neutron flux tube, and tap holes for the lower end 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. The fuel assembly includes an upper tube seat, fuel rods, positioning grids, the 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 is the bottom device 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, a bottom device thereof and a lower nozzle seat applied to the bottom device. 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 tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/33G21C3/332G21C3/322
CPCY02E30/30
Inventor 史宝磊胡立强何晓军张爱民季松涛
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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