A lower pipe seat of nuclear fuel assembly with a filter plate and its filter plate processing technology

A technology for nuclear fuel assemblies and fuel assemblies, which are applied in the assembly of fuel elements, nuclear power generation, and reduction of greenhouse gases, etc., can solve the problems of uneven flow distribution, low flow area share, and low flow at the four corners, and increase the flow area share. , Increase the share of circulation area and improve the effect of economy

Active Publication Date: 2016-06-01
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing nuclear fuel assembly lower nozzle such as figure 1 As shown, its disadvantages are: the proportion of flow area is low, the pressure drop of the lower pipe seat is large, the head of the main pump is consumed, and the economy is not good; affected by the legs of the pipe seat, the flow rate at the four corners is low, and the flow distribution Not uniform, cross flow is likely to occur when the coolant passes through the lower pipe seat and then redistributed, increasing the risk of fuel rod vibration and abrasion failure

Method used

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  • A lower pipe seat of nuclear fuel assembly with a filter plate and its filter plate processing technology
  • A lower pipe seat of nuclear fuel assembly with a filter plate and its filter plate processing technology
  • A lower pipe seat of nuclear fuel assembly with a filter plate and its filter plate processing technology

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Embodiment 1

[0056] like figure 2 , 3 , 4, the present invention includes a square connecting plate 4 and four legs 5 at the lower part of the connecting plate 4, so as to form a bench-like structure as a whole. 3 It is used to install the fuel assembly guide tube, and the water flow hole is used to pass the coolant; in order to increase the flow area share, reduce the pressure drop, and improve the economy of the fuel assembly, the design of the water flow hole should be based on ensuring the structural strength. The larger the distribution area on the connecting plate 4, the better. In order to achieve this purpose, the water flow holes in the present invention adopt triangular water flow holes 2 and square water flow holes 1, wherein: the triangular water flow holes 2 are distributed around the connection hole 3, and are wound around the connection hole 3. The connecting holes 3 are arranged in a circle. Except for the parts where the connecting holes 3 and the triangular flow holes 2...

Embodiment 2

[0061] like figure 2 , 3 , 4, the difference between this embodiment and Embodiment 1 is only that grooves 6 are respectively opened on the four corners of the lower end face of the connecting plate 4, which not only reduces the thickness of the local connecting plate 4, but also reduces the Its material cost; and it is beneficial to increase the coolant flow at the four corners, because usually the four corners of the connecting plate 4 are areas with a low flow rate, and by opening grooves at the four corners, the flow at the four corners is improved, that is, to increase the flow rate. The overall flow distribution uniformity of the lower tube seat is improved, the lateral flow of the coolant when passing through the lower tube seat is avoided, the overall flow distribution uniformity of the lower tube seat is improved, and the risk of failure due to vibration and abrasion of the fuel rod is reduced. Other parts of this embodiment are the same as those of Embodiment 1, an...

Embodiment 3

[0063] like figure 2 , 3 , 4, the difference between this embodiment and Embodiment 1 is that the inner surface of the leg 5 is also provided with an inclined surface 7 for guiding the coolant to flow through the lower cavity of the tube seat, and the inclined surface 7 constitutes a cooling In order to further reduce the pressure drop and improve the economy of the fuel assembly, the opening direction of the inclined surface 7 should satisfy the direction of guiding the cooling liquid toward the middle of the connecting plate 4, that is, the upper end of the inclined surface 7 should be located in the inner side of its lower end. Other parts of this embodiment are the same as those of Embodiment 1, and are not repeated here.

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Abstract

The invention discloses a nuclear fuel component lower pipe seat with a filter plate. The nuclear fuel component lower pipe seat with the filter plate mainly consists of a square connecting plate (4) and supporting legs (5) on the lower portion of the square connecting plate (4). The square connecting plate (4) is penetratingly provided with connecting holes (3) and triangular drain holes (2) around the connecting holes (3) which are used for mounting of fuel component guide pipes, and other positions of the connecting plate (4) is uniformly provided with square drain holes (1). The invention further discloses a processing technology for the filter plate of the nuclear fuel component lower pipe seat. Coolant is high in circulation share and uniform in flow distribution.

Description

technical field [0001] The invention relates to a lower tube seat of a nuclear fuel assembly with a filter plate and the processing technology of the filter plate. Background technique [0002] The nuclear fuel assembly is composed of several fuel rods, guide tube parts, spacer grids, and upper and lower tube seats. Existing nuclear fuel assembly downpipes such as figure 1 As shown in the figure, the disadvantages are: the flow area share is low, the pressure drop of the lower tube seat is large, the head of the main pump is consumed, and the economy is not good; due to the influence of the legs of the tube seat, the flow at the four corners is low, and the flow distribution If it is not uniform, it is easy to generate lateral flow when the coolant is redistributed after passing through the lower tube seat, which increases the risk of fuel rod vibration and abrasion failure. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to overcome the above-m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/32
CPCY02E30/30
Inventor 蒲曾坪茹俊陈杰青涛黄春兰肖忠雍泾朱发文
Owner NUCLEAR POWER INSTITUTE OF CHINA
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