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Upper pipe seat of fuel component

A fuel assembly and nozzle technology, which is applied to reactor fuel elements, assembly of fuel elements, nuclear power generation, etc., can solve problems such as unfavorable flow field distribution of fuel assemblies and poor economy of upper nozzles, and increase the flow area Proportion, solve the problem of poor economy, and ensure the effect of structural strength

Inactive Publication Date: 2013-08-14
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of poor economy of the existing upper pipe seat and unfavorable flow field distribution at the outlet of the fuel assembly, and provide a fuel assembly upper pipe seat

Method used

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  • Upper pipe seat of fuel component
  • Upper pipe seat of fuel component
  • Upper pipe seat of fuel component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as image 3 with Figure 4 As shown, the fuel assembly upper pipe socket is mainly composed of a connecting plate 2, a coaming plate 3 fixed on the edge of the connecting plate 2, and a frame plate 4 fixed on the coaming plate 3. The connecting plate 2 is provided with a guide tube for installing the fuel assembly. The connecting hole A5 and the connecting hole B6 for installing the instrument pipe, a plurality of elongated water holes are evenly opened on the connecting plate 2, the water holes include the water hole A201 and the water hole B202, the water hole A201 and the water hole There is an included angle greater than 0° between the axes of the holes B202; on the connecting plate 2, a connecting portion 203 is formed between two axially adjacent flow holes A201 and two flow holes B202; 2, an enclosing portion 204 is formed between the radially adjacent two flow holes A201 and two flow holes B202; the connecting plate 2 is also provided with a central flow h...

Embodiment 2

[0039] In this embodiment, on the basis of embodiment 1, in order to further increase the flow area ratio, the shape of the flow hole is preferably rectangular. Those skilled in the art can understand that the rectangular water flow hole can make the straight line distance between the connection hole A5 and the connection hole B6 and the water flow hole the shortest, thereby increasing the ratio of the flow area on the connection plate 2 .

Embodiment 3

[0041] This embodiment is on the basis of embodiment 1, as Figure 4 As shown, the side of the water flow hole is concave to form an arc surface A206, and the arc of the arc surface A206 matches the arc of the adjacent connecting hole A5, connecting hole B6 or the central water hole 205. Those skilled in the art can understand that setting the arc surface A206 can make the material distribution between the water flow hole and the connection hole A5, the connection hole B6 or the central flow hole 205 more even, without weak parts, and in consideration of the flow area ratio At the same time, the impact on the structural strength of the connecting plate 2 can also be reduced. On the basis of ensuring the structural strength of the connecting plate 2, the distance between the arc surface A206 and the connecting hole A5, the connecting hole B6 or the central flow hole 205 can be as small as possible.

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Abstract

The invention discloses an upper pipe seat of a fuel component. The upper pipe seat mainly comprises a connection plate, a surrounding plate fixed on the edge of the connection plate, and a frame plate fixed on the surrounding plate, wherein connection holes A for mounting fuel component guide pipes and a connection hole B for mounting an instrument pipe are formed in the connection plate; a plurality of integrally elongated water flowing holes are uniformly formed in the connection plate and comprise water flowing holes A and water flowing holes B; and an included angle between the axis of each water flowing hole A and the axis of the corresponding water flowing hole B is more than 0 degree. The upper pipe seat has the advantages and the beneficial effects that the shapes and the arrangement modes of the water flowing holes are changed, so that the water flowing holes can be uniformly formed, the flowing area proportion increases, and the technical problems of poor economical property of the upper pipe seat and adverse influence to distribution of a flowing field at an outlet of the fuel component are solved.

Description

technical field [0001] The invention relates to the field of nuclear industry, in particular to a fuel assembly upper nozzle. Background technique [0002] The nuclear fuel assembly is composed of a number of fuel rods, guide tubes, positioning grids, upper and lower tube seats, etc. The schematic diagram of its structure is shown in figure 1 shown. Among them, the upper tube base 1 is a key component, which plays the roles of laterally positioning the fuel assembly, bearing and transmitting the pressing force, providing an outlet cavity for the coolant, providing an interface for the lifting of the fuel assembly, and preventing the ejection of the fuel rod. [0003] The existing fuel assembly upper tube base is mainly composed of a connecting plate, a coaming plate and a frame plate. exist figure 2 In , the connecting plate of the existing upper tube socket is shown. The connection plate is generally square, and there are circular instrument pipe connection holes, guid...

Claims

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Application Information

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IPC IPC(8): G21C3/33G21C15/00
CPCY02E30/38Y02E30/40G21C3/322G21C3/3315Y02E30/30
Inventor 黄春兰雷涛茹俊青涛蒲曾坪肖忠焦拥军雍泾张林程华旸
Owner NUCLEAR POWER INSTITUTE OF CHINA