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Lower pipe base of reactor fuel assembly

A fuel assembly and reactor technology, applied in the field of nuclear reactors, can solve the problems of damage to fuel rods, increase the cost of fuel assembly use, etc., achieve the effects of strengthening fixation, ensuring structural strength, and avoiding damage

Active Publication Date: 2015-06-03
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the existing reactor is running, the coolant flows through the fuel assembly at a very fast speed, and the foreign matter contained in the coolant will cause damage to the fuel rods, and the fuel rods need to be replaced frequently, which increases the cost of the fuel assembly

Method used

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  • Lower pipe base of reactor fuel assembly
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  • Lower pipe base of reactor fuel assembly

Examples

Experimental program
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Embodiment

[0022] Such as Figure 1 to Figure 5 As shown, the lower nozzle of the reactor fuel assembly includes a nozzle base and a curved filter plate, wherein the nozzle base includes a square frame, a leg 1, a connecting seat 3 and ribs, and the connecting seat 3 forms a cylindrical shape, a square The frame is composed of four skirts 2, and the number of supporting legs 1 is four, and the four supporting legs 1 are respectively connected to the lower ends of the four right-angled corners of the square frame. Preferably, the square frame of the tube base, the legs 1, the connecting seat 3 and the ribs are integrated into one.

[0023] The curved filter plate is located in the square frame of the tube base. The curved filter plate includes a plurality of strip curved pieces 6. The two long sides of the strip curved pieces 6 form a straight side 601 and a wavy curved side 602 respectively. The strip curved Between the straight side 601 and the wavy curved side 602 of the sheet 6 forms...

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PUM

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Abstract

The invention discloses a lower pipe base of a reactor fuel assembly. The lower pipe base comprises a pipe base substrate and a curved piece filter plate fixed on the pipe base substrate, wherein the pipe base substrate comprises a square frame, and the curved piece filter plate is positioned in the square frame of the pipe substrate and comprises multiple strip-shaped curved pieces side by side; the two long edges of each strip-shaped curved piece respectively form a straight edge and a wavy curved edge, and a smooth transition curved surface is formed between each straight edge and each wavy curved edge of each strip-shaped curved piece; and the straight edges of any two adjacent strip-shaped curved pieces in the curved piece filter plate are respectively positioned on the upper and lower end faces of the curved piece filter plate, and multiple gap passageways are formed between any two adjacent strip-shaped curved pieces in the curved piece filter plate. The lower pipe base provided by the invention has the advantages that the integral structure is simple, and the structural strength is high; and when the lower pipe base is put into use, a coolant mainly flows from the gap passageways, and under the blocking of the strip-shaped curved pieces, foreign materials in the coolant are filtered, the flow speed of the coolant is lowered, and further the foreign materials in the coolant are prevented from damaging a fuel rod.

Description

technical field [0001] The invention relates to a nuclear reactor, in particular to a lower nozzle base of a reactor fuel assembly. Background technique [0002] The reactor fuel assembly includes a skeleton and fuel rods. The skeleton is mainly composed of an upper nozzle, a grid, an instrument tube, a guide tube and a lower nozzle. The fuel rods are connected to the grid, and the coolant flows into the reactor from the lower nozzle , and flow out from the upper tube seat after passing through the fuel rod. The lower nozzle is the lower structural part of the reactor fuel assembly, which plays a role in supporting, positioning and distributing coolant in the fuel assembly. When the existing reactor is running, the coolant flows through the fuel assembly at a very fast speed, and the foreign matter contained in the coolant will cause damage to the fuel rods, and the fuel rods need to be replaced frequently, which increases the use cost of the fuel assemblies. Contents of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/32
CPCY02E30/30
Inventor 青涛谷明非雍泾粟敏茹俊雷涛肖忠
Owner NUCLEAR POWER INSTITUTE OF CHINA