Co-extrusion type annular fuel rod

A fuel rod and co-extrusion technology, which is applied to fuel elements, greenhouse gas reduction, nuclear power generation, etc., can solve the problems of narrow and long coolant flow areas, affecting structural stability, heat conduction obstacles, etc., to simplify the assembly and manufacturing process, Effect of increasing stability and lowering core temperature

Pending Publication Date: 2020-07-31
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, due to the inevitable gap between the wrapping wire and the outer surface of the fuel rod cladding tube, it is easy to generate vibration between the wrapping wire and the outer surface of the fuel rod cladding tube, which affects the stability of the structure, and the contact part between the wrapping wire and the fuel rod The coolant flow area is long and narrow, and there will be vortices and flow stagnation areas on the backflow surface of the winding wire to the coolant, which will also hinder the conduction of heat

Method used

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  • Co-extrusion type annular fuel rod
  • Co-extrusion type annular fuel rod
  • Co-extrusion type annular fuel rod

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Embodiment Construction

[0033] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] Such as figure 1 , 2 A co-extruded annular fuel rod shown includes an upper end plug 1 , a lower end plug 2 , an inner cladding 3 , an outer cladding 4 , and an annular fuel core 5 .

[0035] The annular fuel core body 5, the inner cladding 3 and the outer cladding 4 are processed by co-extrusion, and there is no gap between them, which enhances heat conduction and reduces the core temperature of the fuel pellet.

[0036] The upper end plug 1 is connected above the inner shell 3 and the outer shell 4, and the lower end plug 2 is connected below.

[0037] The annular fuel core 5 is a dispersion or metal fuel.

[0038] The traditional co-extrusion processing method is easy to produce uneven distribution of cores at both ends of the co-extrusion, so the co-extruded annular fuel rod of the present application cuts off the uneven...

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Abstract

The invention relates to the technical field of nuclear fuel, and particularly discloses a co-extrusion type annular fuel rod. No gap exists between a fuel pellet and a cladding, so that heat conduction is enhanced, the center temperature of the fuel pellet is reduced, a traditional pressure spring structure is not needed any more, operation stability is improved, and radioactive waste is reduced.According to the fuel rod structure, the assembling and manufacturing process of the fuel rod is simplified, helium does not need to be filled into the fuel rod during manufacturing, and the cost isreduced.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel, in particular to a co-extruded annular fuel rod. Background technique [0002] During the operation of a nuclear power plant reactor, the performance of nuclear fuel is an important factor affecting the safety and economy of the reactor. Therefore, the research of fuel elements has been placed in a very prominent position in the world. By optimizing the design of fuel elements, adopting advanced structural materials, and improving the manufacturing process of elements, the various performances of nuclear fuel elements are continuously improved, and nuclear power is promoted to be safer and more efficient. direction of economic development. [0003] Usually, nuclear fuel is designed as a solid cylinder, consisting of upper and lower end plugs, pellets, compression springs and cladding. Coolant flows through the cladding to cool the fuel rods. [0004] Compared with traditional solid cylindr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/08G21C3/10
CPCG21C3/08G21C3/10Y02E30/30
Inventor 何晓军史宝磊季松涛邹远方刁均辉徐西安
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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