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Combustible poison coating layer-containing coated fuel particle, pellet, fuel element, and preparation method of coated fuel particle

A technology for coating fuel particles and cladding layers, which is applied in the direction of reactor fuel materials, climate sustainability, and reduction of greenhouse gases. Widespread, enhanced neutron economy and safety effects

Active Publication Date: 2020-09-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the burnable poisons of coated particles are mainly oxides, including europium oxide (Eu 2 o 3 ) and erbium oxide (Er 2 o 3 ), oxide burnable poisons are generally directly co-fired with nuclear fuel or physically coated on the surface of fuel particles (because there is no suitable precursor, it is difficult to prepare oxide burnable poison layers by fluidized bed chemical vapor deposition), and then coated with high temperature particles Desorption is easy to occur during the coating process, and the stability of oxides in reducing environments is poor

Method used

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  • Combustible poison coating layer-containing coated fuel particle, pellet, fuel element, and preparation method of coated fuel particle
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  • Combustible poison coating layer-containing coated fuel particle, pellet, fuel element, and preparation method of coated fuel particle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1. A coated fuel particle containing a burnable poison coating:

[0056] The schematic diagram of the coated fuel particles is as figure 1 as shown, figure 1 Among them, 1-1 is the nuclear fuel core, 1-2 is the zirconium boride coating layer, 1-3 is the pyrolytic carbon loose layer, 1-4 is the inner transition layer of pyrolytic carbon, and 1-5 is the silicon carbide coating Layers, 1-6 are pyrolytic carbon environmental protection layers;

[0057] The coated fuel particles use ceramic fuel as the core, and the ceramic fuel core is sequentially coated with a zirconium boride coating layer, a loose layer, an inner transition layer, a carbide coating layer and an environmental protection layer;

[0058] The material composition of the ceramic fuel core is uranium dioxide, and the ceramic fuel core is a sphere with a diameter of 500-600 μm;

[0059] The thickness of the zirconium boride cladding layer is 1-2 μm;

[0060] The material composition of the loose layer is...

Embodiment 2

[0073] 1. A coated fuel particle containing a burnable poison coating:

[0074] The schematic diagram of the coated fuel particles is as figure 2 as shown, figure 2 Among them, 2-1 is the nuclear fuel core, 2-2 is the boron-containing pyrolytic carbon loose layer, 2-3 is the silicon carbide inner transition layer, 2-4 is the silicon carbide cladding layer, and 2-5 is the silicon carbide environmental protection layer. Floor;

[0075] The coated fuel particles use ceramic fuel as the core, and the ceramic fuel core is coated with a boron-containing loose layer, an inner transition layer, a carbide coating layer and an environmental protection layer in sequence;

[0076] The material composition of the ceramic fuel core is uranium nitride, and the ceramic fuel core is a sphere with a diameter of 800-900 μm;

[0077] The boron-containing loose layer is based on pyrolytic carbon, the porosity of the loose layer is 50%, the boron content is 5%, and the thickness is 90-100 μm; ...

Embodiment 3

[0089] A coated fuel particle containing a burnable poison coating layer, the coated fuel particle is the same as in Example 2, the difference is that 2-2 is a boron-containing silicon carbide loose layer, and the boron-containing loose layer uses silicon carbide as a matrix, The porosity of the loose layer is 50%, the boron content is 5%, and the thickness is 90-100 μm; wherein, the preparation method of the boron-containing silicon carbide loose layer comprises the following steps:

[0090] Heat the temperature of the fluidized bed to 1430°C, use argon as the carrier gas, pass through methyltrichlorosilane, the flow rate of argon is 15.0L / min, and pass through BCl at the same time 3 , BCl 3 The flow rate is 0.5 L / min, and the reaction time is 10 minutes to obtain a boron-containing silicon carbide loose layer.

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Abstract

The embodiment of the invention relates to the field of nuclear fuel, and concretely relates to a combustible poison coating layer-containing coated fuel particle, a pellet, a fuel element, and a preparation method of the coated fuel particle. The coated fuel particle provided by the embodiment of the invention comprises a ceramic fuel core, and a boron-containing combustible poison layer and a functional layer which sequentially coat the ceramic fuel core; and the functional layer comprises one or more of a loose layer, an inner transition layer, a carbide coating layer and an environmental protection layer. According to the coated fuel particle provided by the embodiment of the invention, the boride combustible poison layer can absorb neutrons and adjust reactivity, the coated fuel particle is suitable for power adjustment of different positions in a reactor core, and a boron material is relatively common, so the neutron economy and safety of the reactor are improved. In addition, the boride combustible poison can be prepared by a fluidized bed chemical vapor deposition method and is not easy to desorb; and continuous deposition preparation of each coating layer can be realized in a vertical fluidized bed, so that industrial mass production is facilitated.

Description

technical field [0001] The invention relates to the field of nuclear fuel, in particular to a coated fuel particle containing a burnable poison coating layer, a pellet, a fuel element and a preparation method thereof. Background technique [0002] The high-temperature gas-cooled reactor is one of the fourth-generation advanced reactor types. Its distinctive feature is inherent safety, which comes from the use of all-ceramic coated fuel particles. The all-ceramic coated fuel particles include a nuclear fuel core and a loose pyrolytic carbon layer, an inner dense pyrolytic carbon layer, a silicon carbide layer and an outer dense pyrolytic carbon layer that are sequentially coated on the outside. Coated fuel particles constitute a micro-pressure vessel, which can effectively resist the release of gas or solid fission products. [0003] The fuel element can be further constructed by the coating particles dispersed in the graphite matrix. Generally speaking, there are two forms...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/42G21C3/62
CPCG21C3/42G21C3/62Y02E30/30
Inventor 刘荣正刘马林邵友林刘兵
Owner TSINGHUA UNIV
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