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Supercritical carbon dioxide reactor microsphere fuel assembly

A carbon dioxide, spherical fuel technology, applied in the direction of reactor fuel elements, reactors, fuel elements, etc., can solve problems such as difficult to have practical operability, and achieve the effect of solving application feasibility, reducing pressure drop, and achieving significant effects

Active Publication Date: 2019-01-15
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the result of this design is that the core has an unacceptable pressure drop, making it difficult to be practical

Method used

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  • Supercritical carbon dioxide reactor microsphere fuel assembly

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Embodiment 1

[0025] A microspherical fuel assembly for a supercritical carbon dioxide reactor mainly includes an upper nozzle 1 , a fuel section, and a lower nozzle 7 . Among them, the fuel section includes a coolant inlet 5, a fuel microsphere placement area, and a coolant outlet 6 arranged in sequence from the inside to the outside, and the fuel section constitutes an annular "sandwich biscuit" with "internal and external cavities and middle heat release" geometry, such as figure 1 shown. The coolant inlet 5, the fuel microsphere placement area, and the coolant outlet opening 6 can be arranged coaxially or not, as long as the fuel microsphere placement area is socketed outside the coolant inlet opening 5, the coolant outlet opening 6 It only needs to be socketed on the outside of the fuel microsphere placement area. In this embodiment, it is preferably coaxially arranged, such as figure 1 shown.

[0026] In this embodiment, the fuel microsphere placement area is alternately arranged a...

Embodiment 2

[0030] The difference between this embodiment and Embodiment 1 is that in this embodiment, the structural setting of the annular release zone is mainly optimized, as follows:

[0031] The axial cross-section of the annular heat dissipation zone is a trapezoidal structure, and the side of the annular heat dissipation zone adjacent to the coolant inlet 5 is the long side of the trapezoidal structure.

[0032] At the same time, the arrangement of the supporting structures 2 is also optimized in the present invention. In this embodiment, 3 to 8 supporting structures 2 are arranged at intervals of 200 mm to 400 mm along the axial direction of the fuel microsphere placement area. In this embodiment, the axial interval of the support structure 2 is set to 300mm, the number of support structures 2 is arranged as 4, and there are 3 annular cooling zones arranged alternately with the support structure 2, as figure 1 shown.

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Abstract

The invention discloses a supercritical carbon dioxide reactor microsphere fuel assembly, and the problem that in the prior art, a reactor core has unacceptable pressure drop and is difficult to havepractical operability is solved. The supercritical carbon dioxide reactor microsphere fuel assembly comprises an upper pipe seat, a fuel section and a lower pipe seat which are sequentially arranged from top to bottom; the fuel section comprises a coolant inlet cavity, a fuel microsphere placement area and a coolant outlet cavity which are sequentially arranged from inside to outside, the coolantinlet cavity is communicated with the lower pipe seat, and the coolant outlet cavity is communicated with the upper pipe seat, the fuel microsphere placement area comprises support structures and annular heat release tapes which are arranged alternately along the axial direction of the fuel microsphere placement area; and the inner side of the annular heat release belt is communicated with the coolant inlet cavity through an inner pressing wire mesh, the outer side of the annular heat release tape is also communicated with the coolant outlet cavity through an outer pressing wire mesh, and fuelmicrospheres are filled between the inner side pressing wire mesh and the outer side pressing wire mesh. According to the invention, the pressure drop of a gas flowing through the fuel assembly can be remarkably reduced.

Description

technical field [0001] The invention relates to the field of reactor fuel assemblies, in particular to a supercritical carbon dioxide reactor microspherical fuel assembly. Background technique [0002] The heat transfer coefficient of supercritical carbon dioxide as a coolant is low, and the reactor using supercritical carbon dioxide coolant has a higher outlet temperature. This requires the use of fuel assemblies with high heat transfer capability and high temperature resistance. The micro-spherical fuel element adopts uranium dioxide fuel spheres with a diameter of 2-3mm coated with graphite layer, silicon carbide cladding and other processes, which can withstand high temperatures above 1600 °C. [0003] The fuel assembly is formed by random accumulation of micro-spherical fuel elements, which has a very high heat transfer capacity and can better meet the requirements of supercritical carbon dioxide stacks for fuel assemblies. However, the porosity of the microspherical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/04G21C3/06
CPCG21C3/042G21C3/06Y02E30/30
Inventor 王俊峰黄彦平
Owner NUCLEAR POWER INSTITUTE OF CHINA