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High-temperature-resistant neutron shielding assembly and preparation method thereof

A high-temperature, neutron-resistant technology, applied in the field of radiation protection and nuclear safety, can solve the problems of high preparation cost of boron carbide ceramic blocks, gaps in shielding components, and difficulty in making large blocks, etc. The effect of low production cost

Active Publication Date: 2020-11-13
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When boron carbide powder is used as the shielding material, the cost is low, but the boron carbide powder has the risk of vibrating and collapsing during use, resulting in gaps in some positions of the shielding components, forming neutron hot spots
The preparation cost of boron carbide ceramic blocks is high, and it is difficult to make large blocks. There are a large number of splicing seams of boron carbide ceramic blocks in the shielding assembly, and there are straight-through seams between the cladding and boron carbide blocks, which are easy to form neutron hot spots. The thermal expansion coefficient of boron carbide and steel cladding is very different, and when the assembled shielding material heats up to the working temperature, the gap will be further enlarged

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a high-temperature-resistant neutron shielding assembly for a nuclear reactor, which is composed of a stainless steel cladding and a shielding material filled in the stainless steel cladding.

[0051] The raw materials of the shielding material are CA80 aluminate cement and boron carbide. Among them, the mass percentage of boron carbide is 65%, the mass percentage of CA80 aluminate cement is 35%, and the density of the shielding material is 2.0g / cm 3 .

[0052] The preparation method is as follows: process the stainless steel cladding; weigh the boron carbide powder and CA80 aluminate cement according to the mass ratio of 65:35; put the raw materials into the mixer for 2 minutes and add 16% of the total mass of the shielding material. % water, wet mixed for 2 minutes; poured into the stainless steel casing after mixing, and vibrated with a vibrating rod for 1 minute; then put into the curing box, and cured for 7 days; Bake at 350°C for 24h. A...

Embodiment 2

[0054] This embodiment provides a high-temperature-resistant neutron shielding assembly for a nuclear reactor, which is composed of a stainless steel cladding and a shielding material filled in the stainless steel cladding.

[0055] The raw materials of the shielding material are CA70 aluminate cement, boron carbide, and polycarboxylate superplasticizer. Among them, the mass percentage of boron carbide is 65%, the mass percentage of CA70 aluminate cement is 34.3%, the mass percentage of water reducing agent is 0.7%, and the density of shielding material is 1.9g / cm 3 .

[0056] The preparation method is as follows: process the stainless steel cladding; weigh the boron carbide powder, CA70 aluminate cement, and polycarboxylate superplasticizer according to the mass ratio of 65:34.3:0.7; put the raw materials into a mixer and dry mix them 2min, add 14% water of the total mass of the shielding material, wet mix for 2min; pour it into the stainless steel cladding after mixing, and...

Embodiment 3

[0058] This embodiment provides a high-temperature-resistant neutron shielding assembly for a nuclear reactor, which is composed of a stainless steel cladding and a shielding material filled in the stainless steel cladding.

[0059] The raw materials of the shielding material are CA80 aluminate cement, boron carbide and alumina powder. Among them, the mass percentage of boron carbide is 60%, the mass percentage of CA80 aluminate cement is 10%, the mass percentage of alumina powder is 30%, and the density of shielding material is 2.4g / cm 3 .

[0060] The preparation method is as follows: process the stainless steel cladding; weigh the boron carbide powder, CA80 aluminate cement and alumina powder respectively according to the mass ratio of 60:10:30; put the raw materials into the mixer and dry mix for 1 minute, add Water with 16% of the total mass of the shielding material, mixed wet for 2 minutes; poured into the stainless steel casing after mixing, and vibrated with a vibrat...

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Abstract

The invention discloses a high-temperature-resistant neutron shielding assembly, which comprises a cladding and a shielding material filled in the cladding, raw materials of the shielding material comprise an inorganic nonmetal gel material and boron carbide, and the mass percentage content of boron carbide is 60%-90%. The density of the shielding material is 1.8 g / cm < 3 > to 2.4 g / cm < 3 >, andthe shielding material is prepared through a pouring process. The shielding assembly comprises the stainless steel cladding and the shielding material filled in the stainless steel cladding. The shielding material is a whole block and free of splicing seams, the shielding assembly is applied to the outer side of a nuclear reactor pressure vessel or the outer side of a main pipeline and is used forthe inner side of a heat preservation layer. The usable temperature is higher than 300 DEG C, the production cost is lower than 30% of that of a boron carbide ceramic block, no splicing seam exists,the shielding effect is better than that of a boron carbide ceramic block shielding assembly, and the high-temperature-resistant neutron shielding assembly can replace the boron carbide ceramic blockto be applied to a third-generation reactor heat preservation layer shielding assembly.

Description

technical field [0001] The invention relates to the technical field of radiation protection and nuclear safety, in particular to a high-temperature-resistant neutron shielding component, a preparation method and an application thereof. Background technique [0002] In the third-generation nuclear reactors, some positions between the insulation layer and the pressure vessel need to use shielding materials with high boron content. In the first reactor of AP1000, imported silicon-boron resin was used as the shielding material, but the silicon-boron resin melted and flowed out during thermal debugging, which affected the For other components, boron carbide powder or boron carbide block was used as shielding material in later designs. When boron carbide powder is used as the shielding material, the cost is low, but the boron carbide powder has the risk of vibrating and collapsing during use, resulting in gaps in some positions of the shielding components, forming neutron hot spot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F1/02G21F1/06G21F3/00
CPCG21F1/026G21F1/06G21F3/00Y02E30/30
Inventor 李圆圆潘小强吕焕文周高斌吴莹杨静刘羽
Owner NUCLEAR POWER INSTITUTE OF CHINA