Structural lattice with flow-mixing coordination in nuclear fuel assemblies

A technology of nuclear fuel assembly and function, which is applied in the direction of reactor fuel elements, moderator/core structure, nuclear engineering, etc., can solve the problem of coordination between the clamping system and the mixing system, the weakening of the mixing performance of the structural lattice, Problems such as flow turbulence, to achieve the effect of achieving coordination, reducing pressure loss, and increasing critical heat flux

Active Publication Date: 2015-09-09
NUCLEAR POWER INSTITUTE OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this design did not consider the coordination of the clamping system and the mixing system. The interference of the clamping system (three-bend spring and bridge-shaped rigid convex) on the flow field leads to flow turbulence, especially the impact of the upper rigid convex on the downstream mixing system. Severe interference caused by the mixing effect, resulting in the weakening of the mixing performance of the structural lattice

Method used

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  • Structural lattice with flow-mixing coordination in nuclear fuel assemblies
  • Structural lattice with flow-mixing coordination in nuclear fuel assemblies
  • Structural lattice with flow-mixing coordination in nuclear fuel assemblies

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Embodiment

[0020] Such as figure 1 , figure 2 , image 3 As shown, based on the structural lattice with flow and mixing coordination in nuclear fuel assemblies, it includes a lattice composed of several strips 3 interwoven vertically with each other, and a pair of mixing strips are arranged on both sides of the top of the intersection of the strips 3 Each strip 3 of the wings 5 ​​is recessed to form a half-button-shaped rigid-convex structure-2, and the opening end of the rigid-convex structure-2 faces the bending direction of the corresponding mixing wing 5. According to the bending direction of the mixing wings 5 ​​at the top of the grid strip 3, a half-button structure is stamped on the just convex position on the strip 3, and the half-button shape opens upwards towards the bending direction of the mixing wings, and is formed at the crossing position of the strip 3. Stirring wings with cross orientation.

[0021] The strip provided with the rigid convex structure 1 2 is indented t...

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Abstract

A grid structure with a flow mixing coordination function in a nuclear fuel assembly comprises grids formed by vertically interlacing multiple stripes (3), a pair of mixing wings (5) being respectively provided at two sides of the top of each intersection of the stripes (3), and each stripe (3) concaving inwardly to form a convex structure (2) with a U-shaped cross-section on the stripe. Coordination between a clamping system and a mixing system is realized by using the convex structure, and the mixing performance of the grid structure is enhanced, thereby improving the critical heat flux of the fuel assembly. The paired convex structures in the form of an access ramp effectively rectify the flow inside the grid structure, thereby reducing the pressure loss.

Description

technical field [0001] The invention relates to a structure grid based on the flow and mixing coordination function in the nuclear fuel assembly, which belongs to the design of the fuel assembly structure grid of the pressurized water reactor nuclear power plant. Background technique [0002] The fuel assembly commonly used in the existing pressurized water reactor nuclear power plant is composed of a number of fuel rods, guide pipes, positioning grids, upper and lower nozzle sockets and the like. The positioning grid is an important part of the framework, and its main function is to clamp the fuel rods to make them positioned, and the second is to stir the fluid to increase the critical heat flux density of the fuel assembly. A typical structural grid design adds a mixing system on the basis of the clamping system, so as to realize the superposition of the above two functions of the positioning grid. [0003] Through the retrieval of special topics and patent documents, it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/352G21C5/06G21C15/243
CPCY02E30/38G21C3/322G21C2003/3432G21C3/352G21C3/3432Y02E30/30
Inventor 雷涛陈杰彭园程华旸张世权张虹卢庆肖忠张林雍泾
Owner NUCLEAR POWER INSTITUTE OF CHINA
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