Nuclear fuel component lower pipe seat with filter plate and filter plate processing technology of nuclear fuel component lower pipe seat

A technology for nuclear fuel assemblies and filter plates, which is used in the assembly of fuel elements, nuclear power generation, and reduction of greenhouse gases. , Increase the share of circulation area and improve the effect of economy

Active Publication Date: 2012-10-24
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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  • Nuclear fuel component lower pipe seat with filter plate and filter plate processing technology of nuclear fuel component lower pipe seat
  • Nuclear fuel component lower pipe seat with filter plate and filter plate processing technology of nuclear fuel component lower pipe seat
  • Nuclear fuel component lower pipe seat with filter plate and filter plate processing technology of nuclear fuel component lower pipe seat

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Embodiment 1

[0056] Such as figure 2 , 3 , 4, the present invention includes a square connecting plate 4 and four legs 5 at the bottom of the connecting plate 4, so that the whole is a bench-like structure, and connecting holes 3 and water holes are provided on the connecting plate 4, and the connecting holes 3 It is used to install the guide pipe of the fuel assembly, and the water 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 hole should be based on ensuring the structural strength. The larger the distribution area on the connection plate 4, the better. In order to achieve this purpose, the flow holes in the present invention adopt triangular flow holes 2 and square flow holes 1, wherein: the triangular flow holes 2 are distributed around the connection hole 3, and around the The connection holes 3 are arranged in a circle, except for the parts where the connect...

Embodiment 2

[0061] Such as figure 2 , 3 , 4, the only difference between this embodiment and embodiment 1 is that grooves 6 are respectively opened on the four corners of the lower end surface 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 low flow rate, and by opening grooves at the four corners, the flow at the four corners is improved, that is, the flow rate at the four corners is improved. The overall flow distribution uniformity of the lower tube seat is improved, the lateral flow generated when the coolant passes through the lower tube seat is avoided, the overall flow distribution uniformity of the lower tube seat is improved, and the risk of fuel rod vibration and abrasion failure is reduced. Other parts of this embodiment are the same as those of ...

Embodiment 3

[0063] Such as figure 2 , 3 , 4, the difference between this embodiment and embodiment 1 is that an inclined surface 7 for guiding the coolant to flow through the lower cavity of the tube base is provided on the inner side of the leg 5, and the inclined surface 7 constitutes a cooling Liquid drainage section, so as to further reduce the pressure drop and improve the economy of the fuel assembly. The opening direction of the slope 7 should meet the direction of guiding the cooling liquid toward the middle of the connecting plate 4, that is, the upper end of the slope 7 should be located inside the lower end. Other parts of this embodiment are the same as those of Embodiment 1, and will not be 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 pipe seat of a nuclear fuel assembly with a filter plate and a process for processing the filter plate. Background technique [0002] The nuclear fuel assembly is composed of a number of fuel rods, guide tube parts, positioning grids and upper and lower tube seats. 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 relatively 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 If the coolant is not uniform, it is easy to generate lateral flow when the coolant passes through the lower tube seat and then redistributed, which increases the risk of fuel rod vibration and abrasion failure. Contents of the invention [0003] The object of the present invention is to ove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/32
CPCY02E30/40Y02E30/30
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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