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A fuel assembly for a supercritical water-cooled reactor

A technology for fuel assemblies and water-cooled reactors, which is applied in the directions of reactor fuel elements, fuel elements, fuel element assembly, etc., can solve the problem that the cross-shaped control rod drop-rod fuel assembly cannot meet the small deformation of the fuel assembly at the same time, and achieve enhanced neutron moderation. High capacity, high structural stability, and the effect of improving neutron economy

Active Publication Date: 2022-06-07
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a fuel assembly for supercritical water-cooled reactors, to solve the problem that the fuel assemblies for supercritical water-cooled reactors in the prior art cannot meet the requirements of cross-shaped control rod drop and small deformation of fuel assemblies , to provide a fuel assembly for supercritical water-cooled reactors that can not only realize the drop of cross-shaped control rods, but also improve structural stability and deformation resistance

Method used

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  • A fuel assembly for a supercritical water-cooled reactor
  • A fuel assembly for a supercritical water-cooled reactor

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Embodiment 1

[0030] A fuel assembly with interpolated rod type control rods, such as figure 2 As shown, it includes four sub-assemblies arranged in a 2×2 manner, and a cross-shaped area is formed between the four sub-assemblies. The improvement of this embodiment lies in that a cross frame with a guide hole 2 at the center of the four sub-assemblies is used instead of figure 1 The guide tube in the control rod constitutes the insertion channel of the cross-shaped control rod, and the squeezing action of the control rod and the guide hole 2 can realize the safe drop of the cross-shaped control rod assembly; Improve the structural stability and deformation resistance of fuel assemblies.

Embodiment 2

[0032] A fuel assembly with inserted bundle rod-type control rods, on the basis of Embodiment 1, this embodiment optimizes the structure of the guide hole 2: the cross section of the guide hole 2 is circular or square, and the lower section has a ratio of aperture The aperture of the upper section is small.

[0033] In this embodiment, the hydraulic buffering effect of the guide hole 2 and the control rod is further increased by the water squeezing effect of the reduced aperture, and the impact force on the fuel assembly caused by the falling rod of the control rod assembly is reduced.

Embodiment 3

[0035] In a fuel assembly with inserted bundle rod type control rods, on the basis of any of the above embodiments, water rod boxes 4 are also provided, and the water rod boxes 4 are evenly distributed in the assembly box 1 . In this embodiment, by arranging the water rod boxes 4 evenly, the neutron moderation capability of the core is enhanced, the problem of insufficient neutron moderation in the supercritical water-cooled reactor is solved, and sufficient and uniform moderation of the fuel rods 3 is achieved. .

[0036] Preferably, each subassembly includes a water rod box 4 and several fuel rods 3 located between the water rod box 4 and the assembly box 1; a moderator channel is formed in the water rod box 4, and the water rod box 4 A coolant passage is formed between it and the component box 1 .

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Abstract

The invention discloses a fuel assembly for a supercritical water-cooled reactor, which comprises four subassemblies arranged in a 2×2 square shape, a cross-shaped area is formed between the four subassemblies, and the four subassemblies are located in an assembly box, and the assembly box A cross frame for filling the cross-shaped area is fixed inside, and several guide holes distributed in a cross shape are provided on the cross frame. The purpose of the present invention is to provide a fuel assembly for supercritical water-cooled reactors, to solve the problem that the fuel assemblies for supercritical water-cooled reactors in the prior art cannot meet the requirements of cross-shaped control rod drop and small deformation of fuel assemblies , providing a fuel assembly for a supercritical water-cooled reactor that can realize the drop of cross-shaped control rods, and can also improve structural stability and deformation resistance.

Description

technical field [0001] The invention relates to the field of nuclear reactors, in particular to a fuel assembly for a supercritical water-cooled reactor. Background technique [0002] In the pressurized water reactor, the fuel assembly is the core component of the nuclear reactor core, and its performance is of great significance to the safe operation of the pressurized water reactor nuclear power plant. Practice has proved that the deformation of the fuel assembly is one of the main factors affecting the performance of the fuel assembly. The deformation of the fuel assembly will cause problems such as difficulty in loading and unloading, the control rod cannot be fully inserted, and the quadrant power is tilted. Serious deformation will also cause the fuel assembly to be damaged. This greatly affects the service life of fuel assemblies and seriously threatens the safety of nuclear power production. [0003] At present, in supercritical reactors, cross-shaped control rods a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/12G21C3/32G21C3/326
CPCG21C3/12G21C3/32G21C3/326Y02E30/30
Inventor 朱发文庞华冯琳娜李翔邢硕唐昌兵李庆
Owner NUCLEAR POWER INSTITUTE OF CHINA
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