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Double-sided cooling annular fuel rod with wrapping wire

A technology of double-sided cooling and fuel rods, which is applied in the field of nuclear power to achieve the effects of improving DNBR, reducing flow resistance, and enhancing safety

Pending Publication Date: 2019-06-25
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no literature report on the ring-shaped fuel rod with a wire-wrapped structure
At the same time, the structure and material of annular fuel rods are obviously different from those of fast reactor fuel rods, and the wire winding method of fast reactor fuel rods cannot be directly used outside the annular fuel rods.

Method used

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  • Double-sided cooling annular fuel rod with wrapping wire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 with figure 2 As shown, a double-sided cooling annular fuel rod with wire wrapping described in the present invention includes an upper end plug 1, a lower end plug 6, an inner cladding 2, an outer cladding 3, and an annular fuel pellet 5; wherein , the cavity formed by nesting the inner cladding 2 and the outer cladding 3 is used to accommodate the annular fuel pellet 5, the upper end of the inner cladding 2 and the outer cladding 3 are connected to the upper end plug 1, and the lower end is connected to the lower end plug 6;

[0033] A winding wire 9 is wound on the outer surface of the outer casing 3 , that is, the winding wire 9 is spirally wound on the outer surface of the outer casing 3 . One end of the winding wire 9 is fixed on the lower end plug 6 by welding; the other end is fixed on the upper end plug 1 by welding.

[0034] The upper or lower end plug 6 of the tubular fixing member 7 is provided with 2 to 6 side openings away from the weld...

Embodiment 2

[0040] Such as figure 1 with figure 2 As shown, a double-sided cooling annular fuel rod with wire wrapping described in the present invention includes an upper end plug 1, a lower end plug 6, an inner cladding 2, an outer cladding 3, and an annular fuel pellet 5; wherein , the cavity formed by nesting the inner cladding 2 and the outer cladding 3 is used to accommodate the annular fuel pellet 5, the upper end of the inner cladding 2 and the outer cladding 3 are connected to the upper end plug 1, and the lower end is connected to the lower end plug 6;

[0041] Three winding wires 9 are wound on the outer surface of the outer casing 3 , that is, the winding wires 9 are spirally wound on the outer surface of the outer casing 3 . One end of the winding wire 9 is fixed on the lower end plug 6 by welding; the other end is fixed on the upper end plug 1 by welding.

[0042] The lower end plug 6 of the annular fuel rod is fixed on the lower tube seat through a tubular fixing member 7 ...

Embodiment 3

[0050] Such as figure 1 with figure 2 As shown, a double-sided cooling annular fuel rod with wire wrapping described in the present invention includes an upper end plug 1, a lower end plug 6, an inner cladding 2, an outer cladding 3, and an annular fuel pellet 5; wherein , the cavity formed by nesting the inner cladding 2 and the outer cladding 3 is used to accommodate the annular fuel pellet 5, the upper end of the inner cladding 2 and the outer cladding 3 are connected to the upper end plug 1, and the lower end is connected to the lower end plug 6;

[0051] Three winding wires 9 are wound on the outer surface of the outer casing 3, that is, the winding wires 9 are spirally wound on the outer surface of the outer casing 3: one end of the winding wire 9 is fixed on the lower end plug 6 by welding; It is fixed on the upper end plug 1 by welding.

[0052] The ratio of the pitch of the winding wire to the length of the annular fuel rod is 1:8. The material of the winding wire...

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Abstract

The present invention provides a double-sided cooling annular fuel rod with a wrapping wire. The annular fuel rod comprises an upper end plug, a lower end plug, an inner cladding, an outer cladding and an annular fuel pellet, wherein a cavity formed by nesting the inner cladding and the outer cladding is used is for accommodating the annular fuel pellet, the upper parts of the inner cladding and the outer cladding are connected with the upper end plug, and the lower parts of the inner cladding and the outer cladding are connected with the lower end plug; the outer surface of the outer claddingis wound with one or more wrapping wires, that is the wrapping wire(s) is / are spirally wound around the outer surface of the outer cladding; and the two ends of the wrapping wire(s) are respectivelyfixed to the upper end plug and the lower end plug. The wrapping wire(s) wound around the annular fuel rod can significantly enhance the lateral flow of a coolant and enhance the heat transfer effectof the fuel rod to the coolant, and turbulent flow of the coolant takes away a large amount of channel heat, so the temperature of the fuel rod is reduced, the DNBR (departure from nucleate boiling ratio) is improved, and the safety of the fuel rod is enhanced.

Description

technical field [0001] The invention relates to the technical field of nuclear power, in particular to a fuel rod, and further relates to a double-sided cooling annular fuel rod with wire wrapping. 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 ...

Claims

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Application Information

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IPC IPC(8): G21C3/344G21C3/356G21C15/02
CPCY02E30/30
Inventor 张爱民何晓军史宝磊韩智杰刁均辉季松涛张培升邹远方
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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