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fast neutron reactor fuel rods

A fuel rod, reactor technology, applied in the direction of reactor fuel elements, fast fission reactors, reactors, etc., can solve the problems of increasing the risk of corrosion of lead coolant, structural complexity, high metal consumption, etc.

Active Publication Date: 2022-02-25
由俄罗斯原子能集团公司代表的俄罗斯联邦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of this construction include constructional complexity, relatively high metal consumption and increased risk of accumulating reactive impurities from the coolant in the narrow gap between the line and the tube
This considerably increases the risk of localized overheating in the shell and corrosion in the lead coolant concentrated in the contact points between the shell, lines and tubes

Method used

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  • fast neutron reactor fuel rods
  • fast neutron reactor fuel rods
  • fast neutron reactor fuel rods

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0053]Example 1. According to the first embodiment of the method, a spacer element (4) with an outer diameter of the tube (5) equal to 4 mm was produced for a housing with an outer diameter of 12 mm and a thickness of 0.5 mm. fuel rods. The housing (2) is made of steel which is highly resistant to corrosion in lead coolants. To manufacture the blank ( 12 ), a stainless steel thin-walled tube with an outer diameter of 4 mm and a wall thickness of 0.3 mm (ie equal to 0.6 times the thickness of the fuel rod casing) is produced by any known method. The length of the thin-walled tube is defined based on the length and diameter of the casing (2) of the fuel rod, and the predetermined winding pitch of the spacer elements (4) around the casing of the fuel rod (1). A longitudinal through-slit with a width of 1 mm (eg 0.25 times the outer diameter of the thin-walled tube) is made along the entire thin-walled tube, so that the tubular portion (5) of the spacer element (4) with the groov...

example 2

[0054] Example 2. Spacer elements ( 4 ) for fuel rods were made with the dimensions shown in Example 1 . To make the blank ( 12 ), a stainless steel thin-walled tube with the dimensions shown in Example 1 with an outer diameter of 4 mm and a wall thickness of 0.3 mm (ie equal to 0.6 times the fuel rod shell thickness) was made. Longitudinal through cuts with a width of 0.4 mm were made along the entire thin-walled tube. Then, by calibration, a final width of the slot (6) of 1.2 mm is made, ie 0.3 times the outer diameter of the thin-walled tube. During calibration, one or both longitudinal edges of the groove are folded inside the tube (5) to make a fold (16) with a total height of 0.7mm (1.2-0.4). Afterwards, by extending the thin-walled tube, the end part (7) is formed, which has a radius equal to that of the housing (2), i.e. 12mm, in the form of segments of a cylindrical surface, for use with the Welding of the casing (2) or the end member (3) of the fuel rod.

example 3

[0055] Example 3. A fuel rod element with a casing outer diameter of 12 mm and a thickness of 0.5 mm was manufactured, wherein the outer diameter of the tube (5) was equal to 4 mm. The housing is made of steel with high corrosion resistance in lead coolant environments. For the manufacture of the element a tube (15) was used which had the same diameter, wall thickness and material as the tube used to make the fuel casing, ie a casing with an outer diameter of 12 mm and a thickness of 0.5 mm. The lengths of the tubes (15) for the segments (14) and blanks (12) are based on the winding pitch of the predetermined spacer elements (4) surrounding the housings of the fuel rods (1), and the fuel rod housings (2 ) is limited by the length and diameter.

[0056] A tube (15) having a circumference of 37.68 mm is cut into three equal longitudinal segments (14) having an arc length of 12.56 mm (37.68:3) minus the thickness of the cutting wheel. When the cutting tool has a thickness of 0....

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Abstract

The invention relates to nuclear technology and can be used to prepare fuel rods and fuel assemblies for fast neutron reactor cores using liquid metal coolants. The technical result of the present invention is to reduce the metal content of the fuel rods, and to reduce the contact stresses in the fuel rod casings that occur in the reactor core during burnout of nuclear fuel. In fast neutron reactor fuel rods (the fuel rods containing the nuclear fuel are arranged in fusion-sealed vessels in the form of thin-walled tubular casings and end members made of steel, the fuel rods also comprising spacer elements, the The spacer element is wound helically at a wide pitch around the outer surface of the casing and is fixed to the casing or end member at the end of the fuel rod), the spacer element is in the form of a thin-walled tube, and has a Its length runs longitudinally through the slot. According to the invention, the spacer element is made of a thin-walled tube or thin strip of steel, the middle part of which has the form of a tube with a longitudinal through-slot of set width, the spacer element also has an end member, which Forms are sections of cylindrical shells for welding to shells or fuel rod joints.

Description

technical field [0001] The invention relates to nuclear technology and can be used to prepare fuel rods and fuel assemblies for fast neutron reactor cores using liquid metal coolants. Background technique [0002] A fuel rod for forming a fuel assembly of a fast neutron reactor using a liquid metal coolant is known. The fuel rods contain nuclear fuel arranged in a fritted vessel in the form of a thin-walled tubular casing and end members made of chrome steel. The fuel rod also contains spacer elements in the form of tubing that are helically wound at a wide pitch along the outer surface of the casing and that are secured to the casing or end member at the end of the fuel rod. The spacer element is configured as a fuel assembly in the form of bundles of parallel fuel rods that are regularly spaced across a cross-section of the fuel assembly. This configuration of fuel rods and fuel assemblies has been successfully employed in sodium-cooled BN-type fast neutron reactors. In...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/338G21C3/12
CPCG21C3/12G21C1/02G21C3/338G21C15/06G21C15/28Y02E30/30G21C1/022
Inventor 弗拉基米尔·亚历山德罗维奇·福斯特曼
Owner 由俄罗斯原子能集团公司代表的俄罗斯联邦