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Fuel assembly of light-water reactor

A fuel assembly and reactor technology, applied in the direction of reactor fuel elements, reactors, greenhouse gas reduction, etc., can solve the problems of energy loss, deterioration of heat transfer, etc., achieve the effects of reducing leakage, ensuring economy, and enhancing fluid heat exchange capacity

Active Publication Date: 2013-05-08
CHINA NUCLEAR POWER TECH RES INST CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

like Figure 1b As shown, the fluid flows through Figure 1a The velocity (Velocity) field diagram of the fuel assembly shown, from Figure 1b It can be seen that when the fluid flows through the fuel rod 11 and the grid 12, the fluid loses energy due to the wall shear stress of the viscous fluid, which will generate frictional resistance on the surface of the strip 121 and the fuel rod 11, and will form a low velocity near the surface. area, especially at low flow rates near the surface of the fuel rods 11, which deteriorates heat transfer

Method used

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  • Fuel assembly of light-water reactor
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  • Fuel assembly of light-water reactor

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Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with specific embodiments and accompanying drawings.

[0027] The fuel assembly of the light water reactor of the present invention includes several fuel rods and a grid, the grid is divided into several cells arranged in a rectangular array, and the fuel rods are respectively inserted into the corresponding cells and arranged In several rows and in several columns, it is characterized in that at least some of the fuel rods in the several fuel rods deviate from the center of the corresponding cell, so that there are few fuel rods in some rows between the centers of two adjacent fuel rods. The distance between them is greater than the distance between the centers of the two cells corresponding to the two adjacent fuel rods. After the fuel rods are set eccentrically, the rod spacing between two adjacent fuel rods in the same row can be increased, and the fuel rods tend to fork. Work surplus. ...

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Abstract

The invention provides a fuel assembly of a light-water reactor. The fuel assembly comprises a plurality of fuel rods and a grid rack, wherein the grid rack is separated into a plurality of grid elements which are arrayed in a rectangular array; the fuel rods are respectively inserted into the corresponding grid elements and form a plurality of rows and a plurality of arrays in parallel; and at least parts of the fuel rods are arranged in a manner of being deviated from the centers of the corresponding grid elements, so that the distance between the centers of the two adjacent fuel rods in parts of the arrays of the fuel rods is greater than the distance between the centers of the two adjacent grid elements corresponding to the two adjacent fuel rods. According to the fuel assembly of the light-water reactor disclosed by the invention, the distance between the two adjacent fuel rods can be increased after the fuel rods are eccentric and the fuel rods have a trend to be crossly arrayed; the transverse flowing resistance is reduced and the transverse flow is enhanced and a disturbance effect of the transverse flow can be sufficiently expressed; and the heat exchanging capability of fluid is enhanced and the thermo-technical residual amount is increased.

Description

technical field [0001] The present invention relates to a light water reactor, and more particularly, to a fuel assembly of a light water reactor. Background technique [0002] At present, the fuel assembly of a light water reactor is usually distributed with several grids at intervals along its length direction, and each grid includes several vertically intersecting strips and is divided into several cells by the strips, and fuel rods are inserted into these grids. Yuanzhong. The fuel assembly also includes several conduits and upper and lower nozzles. These conduits replace the fuel rods and are inserted into some cells of the grid to ensure that the grid is fixed at positions distributed along the length of the conduits of the fuel assembly. These fuel rods and tubes are densely arrayed together with the grid and upper and lower nozzles to form a fuel assembly. [0003] Such as Figure 1a Shown is the arrangement of fuel rods 11 in the grid 12 in the fuel assembly of an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/328
CPCY02E30/38Y02E30/40Y02E30/30
Inventor 禹文池周跃民李伟才庞铮铮
Owner CHINA NUCLEAR POWER TECH RES INST CO LTD
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