Fuel assembly for supercritical water cooled reactor

A fuel assembly and water-cooled reactor technology, applied in the direction of reactor fuel elements, fuel elements, assembly of fuel elements, etc., can solve the problem that the deformation of the cross-shaped control rod drop fuel assembly can not be satisfied at the same time, and achieve enhanced neutron moderation capacity, increased outlet temperature and core thermal efficiency, and reduced flow instability problems

Active Publication Date: 2020-08-18
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Fuel assembly for supercritical water cooled reactor
  • Fuel assembly for supercritical water cooled reactor

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Embodiment 1

[0030] A fuel assembly with interposed beam-type control rods, such as figure 2 As shown, four subassemblies arranged in a 2×2 manner are included, and a cross-shaped area is formed between the four subassemblies. The improvement of this embodiment is that the cross frame with guide holes 2 at the center positions of the four subassemblies is used to replace figure 1 The guide tube in the cross-shaped control rod constitutes the insertion channel of the cross-shaped control rod, and the water-squeezing effect of the control rod and the guide hole 2 can realize the safe drop of the cross-shaped control rod assembly; through the integrated structural arrangement of the guide hole 2 and the component box 1, it can Improve the structural stability and deformation resistance of fuel assemblies.

Embodiment 2

[0032] A fuel assembly for inserting beam-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 aperture ratio of the lower section is The upper aperture is small.

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

Embodiment 3

[0035] A fuel assembly in which bundled rod type control rods are inserted. 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, the neutron moderation capability of the reactor core is enhanced by evenly arranging the water rod boxes 4, which solves the problem of insufficient neutron moderation in the supercritical water-cooled reactor, and realizes sufficient and uniform moderation of the fuel rods 3 .

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

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Abstract

The invention discloses a fuel assembly for a supercritical water cooled reactor. The fuel assembly comprises four sub-assemblies arranged in a 2*2 square shape, a cross-shaped area is formed among the four sub-assemblies, the four sub-assemblies are located in an assembly box, a cross-shaped frame used for filling the cross-shaped area is fixed in the assembly box, and a plurality of guide holesdistributed in a cross-shaped mode are formed in the cross-shaped frame. The invention aims to provide the fuel assembly for the supercritical water cooled reactor. The fuel assembly for the supercritical water-cooled reactor aims to solve the problems that in the prior art, a fuel assembly for a supercritical water-cooled reactor cannot meet rod falling of a cross-shaped control rod at the same time, and deformation of the fuel assembly is small, and provided is the fuel assembly for the supercritical water-cooled reactor, wherein the fuel assembly can achieve rod falling of the cross-shapedcontrol rod and 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 PWR, 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 PWR 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 loading and unloading difficulties, control rods cannot be fully inserted, and quadrant power tilt. Severe deformation will also cause damage to the fuel assembly. Thereby greatly affecting the service life of fuel assemblies and seriously threatening the safety of nuclear power production. [0003] Existing, in the supercritical reactor, generally adopt cross-shaped control rod to control the reactivity of core at present...

Claims

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Application Information

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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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