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Location grid with long direction eddy generator

A longitudinal vortex generator and spacer grid technology, applied in the field of spacer grids, can solve the problems of increased channel pressure drop, increased fluid resistance, etc., and achieve the effect of increasing heat transfer capacity and improving comprehensive heat transfer capacity.

Inactive Publication Date: 2008-10-08
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Stirring vanes are designed in the above patents, which greatly increases the heat exchange capacity of the fuel assembly, but the existence of the vanes increases the resistance of the fluid, which greatly increases the channel pressure drop

Method used

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  • Location grid with long direction eddy generator
  • Location grid with long direction eddy generator
  • Location grid with long direction eddy generator

Examples

Experimental program
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Effect test

Embodiment Construction

[0030] refer to figure 1 (a) and figure 1 As shown in (b), the fuel assembly 10 is made up of the lower structure or the lower nozzle base 12, the control rod guide tube 14, the spacer grid 16, the fuel rods 18, the representative tube 20 and the upper structure or the upper nozzle base 22. The lower tube base 12 is used to support the components seated on the lower core plate (not shown) of the core (not shown); the control rod guide tube 14 extends upward from the lower tube base 12; the transverse spacer The frame 16 is used to provide lateral support for the fuel rods arranged in a certain way, and the upper tube base 22 is connected to the upper end of the guide pipe 14 to form a complete assembly to perform conventional operations without damaging the fuel assembly components. Both the lower tube base 12 and the upper tube base 22 have a connecting plate, and holes are opened on the plate for liquid coolant (eg, water) to flow therethrough. In place within the box defi...

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PUM

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Abstract

The present invention discloses a retaining grid with a longitudinal vortex generator; the structure implemented by adding a triangular or rectangular longitudinal vortex generator on the basis of a traditional retaining grid structure, to form a triangular or rectangular retaining grid for a longitudinal vortex generator. In the present invention, several inner bars and outer bars are assembly in a crossing manner to form grid units; the inner bars and outer bars form separate grid units, and longitudinal vortex generators are mounted on the four walls of each separate grid unit; two groups of longitudinal vortex generators opposite to each other are arranged in each grid unit, wherein, one group is on the upper part, while the other group is on the lower part; in that way, a complete retaining grid is formed. The grid can enhance heat exchange and deliver retaining function; the structure of the retaining grid is simplified while good heat exchange performance is maintained; therefore, the grid is easier to fabricate.

Description

technical field [0001] The invention relates to a positioning grid in a nuclear reactor core fuel assembly of a pressurized water reactor nuclear power plant, in particular to a positioning grid with a triangular (or rectangular) longitudinal vortex generator. Background technique [0002] In nuclear fuel element assemblies, spacer grid assemblies are used to precisely maintain the spacing between fuel rods in the nuclear reactor core, prevent fuel rod vibration and provide lateral support for fuel rods. A typical spacer grid assembly design consists of a number of metal grid strips interconnected in an egg basket shape to form cells through which fuel rods and control rod guide tubes pass through standard cells and guide tube cells, respectively. Narrow slots are often utilized to achieve the intermeshing connection between the lattice straps. Each standard cell provides support for a fuel rod at a given axial position by using metal grid strips or elastic grid springs con...

Claims

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Application Information

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IPC IPC(8): G21C3/352
CPCY02E30/40Y02E30/30
Inventor 苏光辉秋穗正武俊梅杨春菊刘勇
Owner XI AN JIAOTONG UNIV
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