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A double anti-foreign matter fuel assembly lower pipe seat

A fuel assembly and anti-foreign matter technology, which is applied in the assembly of fuel elements, reduction of greenhouse gases, nuclear power generation, etc., can solve the problems of damage to fuel rod cladding tubes, etc., to improve the ability to prevent foreign matter, ensure inlet pressure, and improve performance. Effect

Active Publication Date: 2017-11-07
SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Foreign matter in the coolant such as metal debris entering the fuel assembly will cause major damage to the fuel rod cladding tube due to collision friction

Method used

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  • A double anti-foreign matter fuel assembly lower pipe seat
  • A double anti-foreign matter fuel assembly lower pipe seat
  • A double anti-foreign matter fuel assembly lower pipe seat

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Experimental program
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Embodiment 1

[0036] Such as figure 2 As shown, the lower tube base 1 of some embodiments of the present invention is composed of a filter tube base 4 , a filter insert 7 , a lower grille 3 and a support frame 2 . The lowest layer is the support frame 2, which is composed of four pins and the periphery. The pins cooperate with the fixing pins of the lower plate of the core to play a role of fixing and supporting.

[0037] The lower grille 3 is connected to the support frame 2 by welding. The lower grid plate 3 is manufactured by machining, and is a square with a side length of about 180mm-220mm, and a thickness of about 15-25mm. Such as image 3 As shown, the lower grille 3 is provided with water holes 5 by machining. The flow hole 5 can be circular, square or other shapes, and its equivalent diameter is about 5-7mm. In order to install the filter insert 7, a groove 6 is formed on the lower grille 3 by machining or wire cutting, such as Figure 4 shown.

[0038] The filter insert 7 i...

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Abstract

The invention discloses a fuel assembly lower tube seat with double foreign matter prevention functions and relates to the field of design of pressurized water nuclear reactors. A lower grid plate of the lower tube seat adopts large water flow hole design, so that the pressure reduction is reduced; in order to improve the foreign matter prevention performance, the lower tube seat is characterized in that a large water flow hole is divided firstly by an embedding piece, so that a primary foreign matter prevention function is exerted; subsequently, a tubular foreign matter prevention device is mounted on an upper tube seat, so that a secondary foreign matter prevention function is exerted. Due to the double foreign matter prevention functions, the large water flow hole is divided twice and is divided into a plurality of parts, so that the size of the foreign matters is greatly limited; the foreign matter prevention capability is improved; consequently, due to the large water flow hole design and the double foreign matter prevention design, the fuel assembly lower tube seat with double foreign matter prevention functions can be used for reducing the pressure reduction and improving the foreign matter prevention performance.

Description

technical field [0001] The invention relates to the design field of pressurized water nuclear reactors, in particular to a fuel assembly lower nozzle with double protection against foreign objects. Background technique [0002] A pressurized water nuclear reactor fuel assembly usually consists of a number of fuel rods, guide tube components, instrument tube components, grids, upper and lower tube sockets, etc. Among them, the lower nozzle, as an important part of the fuel assembly skeleton, is one of the main bearing parts of the fuel assembly, and its reliability directly affects the safety of the fuel assembly in operation, transportation and running. At the same time, the lower nozzle is also an important interface part, and its structural design has a direct impact on the operational performance of the fuel assembly and the compatibility with the reactor internals. As the inlet of the core coolant, the anti-foreign body performance of the lower nozzle is also one of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/32
CPCG21C3/32Y02E30/30
Inventor 郑轶雄干富军何广进刘松周云清卢俊强童幸丁阳
Owner SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD