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Metal-coated fuel and preparation method thereof

A metal cladding and fuel technology, which is applied in the fields of reactor fuel material, reactor manufacturing, and greenhouse gas reduction, etc., can solve the problems of poor performance of TRISO particles and endanger the safety of reactor operation, and achieve the effect of improving anti-oxidation performance and increasing melting point.

Active Publication Date: 2020-11-10
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a metal-coated fuel and its preparation method, thereby solving the problem of poor performance of traditional TRISO particles and endangering the safety of reactor operation

Method used

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  • Metal-coated fuel and preparation method thereof
  • Metal-coated fuel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Coated fuel particles with metallic niobium coating.

[0029] 1) The establishment of the relationship between the carrier concentration of the precursor and the temperature of the evaporation tank and the flow rate of the carrier gas: the tank temperature of niobium pentachloride is set at 150°C, 160°C, 170°C, 180°C, 190°C, 200°C, 210°C At different temperatures such as ℃, control the flow rate of hydrogen or argon carrier gas at 1L / min, 2L / min, 3L / min, 4L / min, 5L / min, 6L / min, etc., and control two factors to do parallel experiments , to establish the relationship between carrier gas concentration, tank temperature and carrier gas flow rate.

[0030] 2) Establish the relationship between the porosity of the metal coating and the carrier concentration of the precursor, and study the porosity of the coating and the tank body of the carrier concentration of the precursor at different concentrations. The precursor loading concentrations of the loose niobium coa...

Embodiment 2

[0036] Example 2: Coated fuel particles with metallic zirconium coating.

[0037]1) The establishment of the relationship between the carrier concentration of the zirconium precursor and the problem of the evaporation tank and the flow rate of the carrier gas: set the temperature of the tank containing zirconium tetraiodide at 300°C, 310°C, 320°C, 330°C, 340°C, 350°C ℃, 360℃, 370℃ and other different temperatures, control the flow rate of hydrogen or argon carrier gas at 1L / min, 2L / min, 3L / min, 4L / min, 5L / min, 6L / min, etc. Parallel experiments were carried out on two factors to establish the relationship between the concentration of zirconium tetraiodide carrier gas, the temperature of the tank and the flow rate of the carrier gas.

[0038] 2) Establish the relationship between the porosity of the zirconium metal coating and the concentration of the precursor, and study the porosity of the zirconium coating and the tank of the precursor concentration at different concentration...

Embodiment 3

[0046] Example 3: Coated fuel particles with metallic tungsten coating.

[0047] 1) Establishment of the relationship between the carrier concentration of the precursor and the problem of the evaporation tank and the flow rate of the carrier gas: set the temperature of the tank containing tungsten hexachloride at 190°C, 200°C, 210°C, 220°C, 230°C, 240°C , 250°C, 260°C, 270°C and other different temperatures, control the flow rate of hydrogen or argon carrier gas at 1L / min, 2L / min, 3L / min, 4L / min, 5L / min, 6L / min and other different flow rates , control the two factors to do parallel experiments, and establish the relationship between the concentration of tungsten hexachloride carrier gas, the temperature of the tank and the flow rate of the carrier gas.

[0048] 2) Establish the relationship between the porosity of the tungsten metal coating and the concentration of the precursor, and study the porosity of the tungsten coating and the tank of the precursor concentration at diff...

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Abstract

The invention provides a metal-coated fuel and a preparation method thereof. The metal-coated fuel sequentially comprises a nuclear fuel core, a loose metal layer and a compact metal layer from insideto outside. The method comprises the following steps: S1, providing a nuclear fuel core, loading the nuclear fuel core into a high-temperature spouted bed, and introducing argon to enable the nuclearfuel core to be in a fluidized state; S2, introducing hydrogen or argon or a mixed gas of hydrogen and argon, and controlling the proportion of the precursor of the loose metal layer in the carrier gas to be 5-10% V / V, so as to coat the loose metal layer on the surface of the nuclear fuel core; S3, controlling the proportion of the precursor of the compact metal layer in the carrier gas to be 0.2-2% V / V so as to further coat the compact metal layer; and S4, stopping introducing the precursor, introducing argon, and cooling the fuel to obtain the lithium ion battery positive electrode material. The metal-coated fuel provided by the invention has the advantages of good thermal conductivity, strong fission product retention capacity, low breakage rate and the like, and can effectively improve the safety and economy of nuclear fuel.

Description

technical field [0001] The invention relates to the technical field of nuclear fuel, and more particularly relates to a metal-coated fuel and a preparation method thereof. Background technique [0002] Traditional TRISO pellets consist of a fuel core and four cladding layers. The cladding layer is composed of refractory ceramic materials deposited on the surface of the core, and the four cladding layers from the inside to the outside are buffer layer, inner dense pyrolytic carbon layer, SiC layer and outer dense pyrolytic carbon layer. Each layer of cladding plays an important role in containing radioactive products, blocking internal pressure, and maintaining the integrity of the particle. [0003] However, conventional TRISO particles have many problems, such as fuel core migration caused by the amoeba effect, particle integrity damage caused by pressure shell failure, and radioactive products caused by erosion of the SiC coating by fission products (palladium) release e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/42G21C3/60G21C3/62G21C21/02
CPCG21C3/42G21C3/60G21C3/62G21C21/02Y02E30/30
Inventor 张锋林俊杨旭郭立华严超曹长青朱智勇尤卢俊强朱丽兵
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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