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Fuel assembly, and bottom device and foreign body-resistant assembly thereof

A bottom device and fuel assembly technology, which is applied in the field of reactor engineering, can solve the problems of insufficient anti-foreign matter effect, and achieve the effects of lowering temperature, enhancing safety, and increasing lateral flow

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 object of the present invention is to provide a fuel assembly, its bottom device and the foreign object prevention assembly of the fuel assembly, which solves the technical problem of insufficient foreign object prevention effect of the bottom device and the foreign object prevention assembly in the fuel assembly application

Method used

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  • Fuel assembly, and bottom device and foreign body-resistant assembly thereof
  • Fuel assembly, and bottom device and foreign body-resistant assembly thereof
  • Fuel assembly, and bottom device and foreign body-resistant assembly thereof

Examples

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specific Embodiment 1

[0038] like Figure 1-5 As shown, an anti-foreign object assembly includes: an anti-foreign object net frame 13 and an anti-foreign object net 14 connected with the anti-foreign object net frame 13, and a plurality of filter units are provided on the anti-foreign object net 14; the anti-foreign object The frame body 13 has a square structure as a whole, and the four corners of the anti-foreign object frame body 13 are provided with grooves.

[0039] The four sides of the edge portion of the anti-foreign matter net frame body 13 are folded upward by 90°.

[0040] The upper surface of the anti-foreign matter net frame 13 is provided with anti-foreign matter net frame ribs 131 arranged in parallel and intersecting, and the anti-foreign matter net 14 is provided with anti-foreign matter net ribs 141 arranged in parallel and intersecting.

[0041] Threaded holes 18 are evenly arranged on the frame body ribs 131 of the anti-foreign matter net.

[0042] The anti-foreign matter net ...

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Abstract

The invention belongs to the technical field of reactor engineering, and concretely relates to a fuel assembly, and a bottom device and foreign body-resistant assembly thereof. The foreign body-resistant assembly comprises a foreign body-resistant screen frame body and a foreign body-resistant screen connected with the foreign body-resistant screen frame body, and the foreign body-resistant screenis provided with a plurality of filtering units; and the foreign body-resistant screen frame body is a square structure wholly, and four corners of the foreign body-resistant screen frame body are provided with grooves. The bottom device comprises a lower tube seat and the foreign body-resistant assembly connected thereto, and the foreign body-resistant assembly is the foreign body-resistant assembly 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 an 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 endsof 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 comprises a lower tube seat and the foreign body-resistant assembly; and the foreign body-resistant assembly is the foreign body-resistant assembly 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 fuel assembly anti-foreign matter 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 m...

Claims

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Application Information

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IPC IPC(8): G21C3/08G21C3/32G21C3/322G21C3/336
CPCY02E30/30
Inventor 何晓军史宝磊季松涛张爱民
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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