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Fuel rod, fuel assembly and reactor core thereof

A fuel assembly and fuel rod technology, applied in the directions of reactors, fuel elements, and reactor fuel elements, etc., can solve the problems of the maximum temperature of the center of the fuel pellet reaching the melting point, unfavorable operating economy of the nuclear power plant, and the release of radioactive substances. The effect of temperature reduction, compact structure, and increased power density

Pending Publication Date: 2022-03-29
CHINA NUCLEAR POWER TECH RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] If the temperature of the fuel pellets in the fuel rods is too high, it may cause the highest temperature in the center of the fuel pellets to reach the melting point; especially when the temperature inside the fuel pellets cannot be effectively derived in time, that is, the core coolant cannot cool the fuel rods. When effectively cooled, the fuel pellets may melt and collapse or the fuel rod cladding may be damaged, resulting in the release of radioactive substances in the fuel rods
Therefore, in order to ensure that the maximum temperature of the fuel pellet center is lower than the limit value, ensure the mechanical integrity of fuel rods and fuel assemblies, and ensure the safety of the reactor, the power density of the reactor core is usually limited to a certain range, but this in turn will be detrimental to the operating economics of nuclear power plants

Method used

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  • Fuel rod, fuel assembly and reactor core thereof
  • Fuel rod, fuel assembly and reactor core thereof
  • Fuel rod, fuel assembly and reactor core thereof

Examples

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Effect test

Embodiment 1

[0033] Example 1, such as Figure 1-Figure 2 As shown, a fuel rod 100 includes a cladding 10 and a fuel pellet 20 sealed in the cladding 10. The fuel pellet 20 includes metal uranium. The cladding 10 can be made of zirconium alloy or stainless steel. The fuel pellet 20 includes The main part 21 arranged in the middle, and at least six wing parts 22 extending outward from the main part 21, the cladding 10 matches the shape formed by connecting the main part 21 and the wing part 22, and the main part 21 and the wing part 22 are connected, It can be understood that the main part 21 is connected with the fuel pellets 20 loaded in the wing parts 22. Preferably, there are six wing parts 22, and the wing parts 22 are arranged parallel to each other and evenly arranged on the outer circumference of the main part 21. At this time, the parallel Setting means that the wings are arranged in parallel before the knob is turned, and each wing 22 is rotated at least 1 round in the circumferen...

Embodiment 2

[0037] Example 2, such as Figure 3-Figure 8 As shown, a fuel assembly includes an outer box 200 and a fuel rod 100 in Embodiment 1. The fuel rod 100 includes a cladding 10 and a fuel pellet 20 sealed in the cladding 10. The cross section of the outer box 200 is six It can be understood that the outer box 200 has a hexagonal structure, the fuel rods 100 are arranged in the hexagonal outer box 200, the fuel pellets 20 include metal uranium, and the cladding 10 can be made of zirconium alloy or stainless steel. The box 200 can be made of zirconium alloy or stainless steel. In this embodiment, the outer box 200 has a regular hexagonal structure. There are multiple fuel rods 100. Each fuel rod 100 has the same length and shape. The fuel rods 100 are triangular in shape. Arranged in the outer box 200 of a regular hexagon, the triangular arrangement further makes it possible to set more fuel rods 100 under the same outer contour size, that is, under the same unit volume, and the gap...

Embodiment 2-1

[0038] Embodiment 2-1, such as Figure 4 As shown, a fuel assembly includes an outer box 200 and a plurality of fuel rods 100 in Embodiment 1. The outer box 200 has a regular hexagonal structure, and the fuel rods 100 are arranged in a triangular shape inside the outer box 200 of the regular hexagonal structure.

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Abstract

The invention discloses a fuel rod, a fuel assembly and a reactor core thereof, the fuel rod comprises a cladding and a fuel pellet sealed in the cladding, the fuel pellet comprises a body arranged in the middle and at least six wing parts extending outwards from the body, and each wing part is twisted for at least one circle in the circumferential direction by taking the longitudinal axis of the body as the center; the fuel assembly comprises an outer box and the fuel rods, the cross section of the outer box is hexagonal, and the fuel rods are triangularly arranged in the outer box; the reactor core comprises the fuel assembly; the fuel rod is provided with at least six wing parts, and the wing parts are twisted for at least one circle in the circumferential direction by taking the longitudinal axis of the body as the center, so that the fuel rod has more excellent heat conduction performance, heat in the fuel rod can be easily conducted out, and the center temperature of the fuel pellet is greatly reduced; the reactor core has the potential of improving the power density under the condition of ensuring nuclear safety, and the reactor can be safer, more economical, compact in structure and wide in application.

Description

technical field [0001] The invention relates to the technical field of reactor design in a pressurized water reactor nuclear power plant, in particular to a fuel rod, a fuel assembly and a reactor core thereof. Background technique [0002] The reactor core of the existing traditional pressurized water reactor nuclear power plant is composed of dozens to hundreds of fuel assemblies. The fuel rods in each fuel assembly are elongated cylindrical, and each fuel rod consists of nuclear fuel uranium pellets stacked within a fuel cladding tube that is plugged with end plugs and sealed welded to enclose the fuel , assembled with spacer grids and top and bottom fixtures, each fuel assembly is provided with guide tubes for inserting control rods or burnable poison rods and neutron detectors. [0003] If the temperature of the fuel pellets in the fuel rods is too high, it may cause the highest temperature in the center of the fuel pellets to reach the melting point; especially when t...

Claims

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Application Information

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IPC IPC(8): G21C3/16G21C3/28G21C3/322G21C3/326
CPCG21C3/16G21C3/28G21C3/322G21C3/326Y02E30/30
Inventor 李冬生蔡利
Owner CHINA NUCLEAR POWER TECH RES INST CO LTD