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Efficient filtering lower tube seat, fuel assembly and nuclear reactor

A high-efficiency filtration and fuel assembly technology, applied in nuclear engineering, nuclear power generation, nuclear power plants, etc., can solve problems such as suboptimal filtration performance improvement, weak filtration ability for short and small foreign objects, and difficult connection or welding. Flow performance, improved structural strength and reliability, and strong integrity

Inactive Publication Date: 2021-09-07
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) In terms of design, due to the limitation of the assembled design, the size of the flow channel grid is relatively large, the ability to filter short and small foreign matter is weak, and the improvement of the filtration performance is not optimal;
[0005] (2) The assembled design is more cumbersome for the manufacturer, the connection or welding between the blade and the rib is very difficult, prone to defects, and the production efficiency is low

Method used

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  • Efficient filtering lower tube seat, fuel assembly and nuclear reactor
  • Efficient filtering lower tube seat, fuel assembly and nuclear reactor
  • Efficient filtering lower tube seat, fuel assembly and nuclear reactor

Examples

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Effect test

Embodiment

[0046] A nuclear reactor fuel assembly 1, comprising an upper tube base 2, a grid 3, a fuel rod 4, an instrument tube 5, a guide tube 6 and a lower tube base 7, such as figure 1 As shown, when the nuclear reactor is running, the coolant flows in from the lower tube base 7 and flows out from the upper tube base 2 .

[0047] In order to solve the problems existing in the design and manufacture of the existing lower nozzle, this embodiment proposes a high-efficiency filter lower nozzle, specifically as Figure 2-3 As shown, the lower tube seat 7 of this embodiment is composed of a connecting plate 13 and a leg 12 . Wherein, the connection plate 13 of this embodiment is composed of S-shaped ribs 8, straight ribs 9, instrument tube support seat 10 and guide tube support seat 11, and the connection plate 13 of this embodiment is suitable for integral manufacturing.

[0048] Such as Figure 4As shown, the S-shaped ribs 8 of this embodiment are regularly and densely arranged at a p...

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Abstract

The invention discloses an efficient filtering lower tube seat, a fuel assembly and a nuclear reactor. The lower tube seat is composed of a connecting plate and supporting legs; the connecting plate is designed into square grids which are densely and regularly arranged, an S-shaped curved surface array is adopted in the grids to form a flow channel for filtering foreign matters, and straight ribs are adopted to divide the S-shaped curved surface array into single completely-closed flow channels. The flow channel of the lower tube seat is composed of the S-shaped curved surface array, the filtering effect and the circulation effect are good, and compared with a C-shaped curved surface, the S-shaped curved surface is small in deflection and better in circulation capacity and deformation resistance capacity; a long flow guide section is reserved at the upper end of a S-shaped curved flow channel, so that the water flow direction at the outlet is consistent.

Description

technical field [0001] The invention belongs to the technical field of fuel assemblies, and in particular relates to a high-efficiency filter down pipe seat, a fuel assembly and a nuclear reactor. Background technique [0002] The lower nozzle is the lower structural part of the reactor fuel assembly, which provides support, positioning and distribution of coolant flow for the fuel assembly. In addition, since the coolant flows through the fuel assembly at a very fast speed during the operation of the reactor, the coolant may The contained foreign matter will damage the fuel rods, resulting in the risk of fuel rod breakage. In order to limit this risk, the lower nozzle needs to have the function of filtering foreign matter to prevent foreign matter from flowing into the fuel assembly. [0003] Regarding the lower pipe seat with foreign matter filtering function, there are various patents and documents both at home and abroad to describe (such as Figure 6-10 Shown prior art ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21D1/02G21D1/04G21D1/00
CPCG21D1/02G21D1/04G21D1/003Y02E30/00
Inventor 粟敏郑美银蒲曾坪焦拥军肖忠陈平雷涛陈杰任全耀
Owner NUCLEAR POWER INSTITUTE OF CHINA
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