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An inlet runner assembly for stably positioning rod bundles

A technology of inlet runners and rod bundles, applied in the field of nuclear fuel assembly visualization, can solve problems such as displacement and deformation, and achieve the effect of improving accuracy

Active Publication Date: 2021-07-20
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an inlet channel assembly with stable positioning of the rod bundles to solve the problem in the prior art that the fluid enters the inlet channel to scour the rod bundles and cause deformation and displacement, so that the fluid can enter the middle at a uniform speed. Runner, to avoid deformation and displacement caused by scouring the rod bundle, and to improve the accuracy of the experiment on the flow field distribution characteristics of the rod bundle fuel assembly

Method used

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  • An inlet runner assembly for stably positioning rod bundles
  • An inlet runner assembly for stably positioning rod bundles

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Such as figure 1 and figure 2 The shown inlet channel assembly for stably positioning the rod bundle includes an inlet channel 2 for connecting with the intermediate channel, a rod bundle 7 partially located in the inlet channel 2, and also includes a The inlet joint 8, the inner sleeve 3 located in the inlet flow channel 2, one end of the rod bundle 7 extends into the inner sleeve 3, and the surface of the inner sleeve 3 is provided with several through holes 4; In the axial direction, all the through holes 4 are staggered with the inlet connecting pipe 8 . in figure 1 Middle arrows indicate fluid flow paths.

[0027] Further, the inlet joint, the inlet flow channel and the inner sleeve are all cylindrical structures. The inner sleeve is welded to the inlet runner.

[0028] Further, the inner sleeve includes several through holes, and the positions of the through holes are lower than the inlet joint, and the diameter of the inlet joint is smaller than the diamete...

Embodiment 2

[0033] Such as figure 1 and figure 2 In the shown inlet runner assembly, the rod bundle is stably positioned. The fluid enters the inlet runner 2 through the inlet nozzle 8. The inlet nozzle 8 and the inlet runner 2 are both cylindrical structures and communicated by welding. The cross-section of the inlet nozzle 8 The diameter is smaller than the cross-sectional diameter of the inlet channel 2. The fluid then flows into the inner sleeve 3 through the through hole 4 on the inner sleeve 3 . After passing through the rod bundle 7, the fluid flows out from the inner sleeve 3 to the flow channel connecting flange 1, and enters the upper middle flow channel.

[0034] The inlet flow channel 2 is welded with the flow channel connection flange 1 , and the other end of the flow channel connection flange 1 is connected with the middle flow channel through bolts 6 . The other end of the inlet channel 2 is welded together with the end sealing flange 5, and the end sealing flange 5 is ...

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Abstract

The invention discloses an inlet channel assembly for stably positioning rod bundles, which includes an inlet channel for connecting with an intermediate channel, a rod bundle partially located in the inlet channel, and an inlet connecting pipe communicated with the inlet channel, located in the In the inner sleeve in the inlet channel, one end of the rod bundle extends into the inner sleeve, and a number of through holes are arranged on the surface of the inner sleeve; in the axial direction of the inner sleeve, all the through holes are staggered from the inlet connection. The purpose of the present invention is to provide an inlet channel assembly with stable positioning of the rod bundles to solve the problem in the prior art that the fluid enters the inlet channel to scour the rod bundles and cause deformation and displacement, so that the fluid can enter the middle at a uniform speed. The flow channel is to avoid deformation and displacement caused by washing the rod bundle, and to improve the accuracy of the experiment of the flow field distribution characteristics of the rod bundle fuel assembly.

Description

technical field [0001] The invention relates to the field of visualization of nuclear fuel assemblies, in particular to an inlet runner assembly in which rod bundles are stably positioned. Background technique [0002] In nuclear power plants, heat dissipation from the surface of the fuel rods in the reactor core is important to both the efficiency and safety characteristics of the reactor. The fuel rods of the reactor have many positioning grids. The blades on the positioning grids can effectively stir the fluid, and generate secondary flow on the transverse section of the rod bundle channel. The secondary flow can effectively improve the heat transfer in the rod bundle channel. coefficient. In the PWR fuel assembly, the flow field in the bundle channel is very complex, especially the flow field downstream of the spacer grid. The flow field distribution in the rod bundle channel will effectively affect the heat dissipation performance of the rod bundle channel, and then a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/322
CPCG21C3/322Y02E30/30
Inventor 毕景良黄彦平昝元锋徐建军谢峰
Owner NUCLEAR POWER INSTITUTE OF CHINA