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Method for preparing annular FCM pellet

An annular core and annular technology, which is applied in the field of annular FCM pellet preparation, can solve the problems of potential safety hazards, core temperature, core and edge temperature difference pellet irradiation swelling and pellet cracking tendency, etc. Good appearance and the effect of improving thermal conductivity

Inactive Publication Date: 2018-07-06
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The shape of the conventional FCM pellets is solid, and the center temperature, the temperature difference between the center and the edge, the radiation swelling of the pellets and the cracking tendency of the pellets are relatively large during the irradiation process, and there are certain safety hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] A method for preparing annular FCM pellets includes the following steps:

[0027] Step 1, mold processing.

[0028] According to the geometric shape of the annular core block, the annular core block forming mold containing the annular hollow cavity is processed. The material of the forming mold is steel or rubber.

[0029] Step 2. Dressing mixture of TRISO granules.

[0030] Step 2.1, coat a layer of binder on the surface of TRISO particles, the binder is glycerol diluted with absolute ethanol, and the glycerol concentration is 10-13%;

[0031] Step 2.2, put the TRISO particles coated with the binder and the SiC powder into the container, and use the "surface coating" bonding method to uniformly mix the TRISO particles and the SiC powder, and bond them evenly on the surface of the TRISO particles A layer of SiC powder is used as a molding material.

[0032] Step 3, the annular FCM core block is formed.

[0033] Use steel molds for bidirectional molding, or use rubber molds for co...

Embodiment 1

[0038] A method for preparing annular FCM pellets includes the following steps:

[0039] Step 1, mold processing.

[0040] Processing an annular core block forming mold containing an annular hollow cavity. The outer diameter of the annular hollow cavity is 21mm, the inner diameter is 10mm, and the height is 10mm. The material of the forming mold is steel.

[0041] Step 2. Dressing mixture of TRISO granules.

[0042] Step 2.1, coat a layer of binder on the surface of TRISO particles, the binder is glycerol diluted with absolute ethanol, and the glycerol concentration is 10%;

[0043] Step 2.2, put the TRISO particles coated with the binder and the SiC powder into the container, and use the "surface coating" bonding method to uniformly mix the TRISO particles and the SiC powder, and bond them evenly on the surface of the TRISO particles A layer of SiC powder.

[0044] Step 3, the annular FCM core block is formed.

[0045] The steel mold is used for bidirectional molding, the pressing pres...

Embodiment 2

[0049] A method for preparing annular FCM pellets includes the following steps:

[0050] Step 1, mold processing.

[0051] Processing an annular core block forming mold containing an annular hollow cavity, the outer diameter of the annular hollow cavity is 20mm, the inner diameter is 9mm, and the height is 8mm. The material of the forming mold is steel.

[0052] Step 2. Dressing mixture of TRISO granules.

[0053] Step 2.1, coat a layer of binder on the surface of TRISO particles, the binder is glycerol diluted with absolute ethanol, and the glycerol concentration is 13%;

[0054] Step 2.2, put the TRISO particles coated with the binder and the SiC powder into the container, and use the "surface coating" bonding method to uniformly mix the TRISO particles and the SiC powder, and bond them evenly on the surface of the TRISO particles A layer of SiC powder.

[0055] Step 3, the annular FCM core block is formed.

[0056] The steel mold is used for bidirectional molding, the pressing pressu...

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Abstract

The invention relates to the technical field of preparation of nuclear fuel pellets, and particularly discloses a method for preparing an annular FCM pellet. The method comprises the following steps of: (1) processing a mould; (2), coating TRISO particles, and performing material mixing; (3), forming the annular FCM pellet; and (4), sintering the annular FCM pellet. The annular FCM pellet preparedby using the method has a good surface appearance, and the density and chemical composition of the annular FCM pellet can meet requirements of technical indexes, and can be applied to a light-water reactor.

Description

Technical field [0001] The invention belongs to the technical field of nuclear fuel pellet preparation, and specifically relates to a method for preparing an annular FCM pellet. Background technique [0002] The nuclear fuel element is the core component of the reactor, and its advancement and safety are the important foundation for the advancement and safety of the reactor. FCM pellets are designed for high burnup uranium used in light water reactors. TRISO particles are encapsulated in a SiC matrix with high overall stability and high thermal conductivity, as well as good compatibility with coolants. Sex. The all-ceramic matrix coating makes the release of fission gas and corrosive fission products little, high fault tolerance in the event of an accident, and safety. [0003] The shape of conventional FCM pellets is solid. During the irradiation process, the center temperature, the temperature difference between the center and the edge, the swelling tendency of the pellets and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565G21C3/64C04B35/628
CPCC04B35/565C04B35/62892C04B2235/94G21C3/64Y02E30/30
Inventor 刘文涛周续董秋实李宗书孟莹郝若彤
Owner CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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