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Decontamination cement and application thereof in radioactive graphite dust pollution removal

A technology of graphite dust and radioactivity, applied in other chemical processes, chemical instruments and methods, etc., can solve the problems of less operation experience of pebble bed high temperature gas-cooled reactor, less decontamination experience and decontamination technology, and influence of reactor operation, etc. Improves rheological properties, prevents bacterial growth, prevents delamination or segregation

Active Publication Date: 2019-04-26
CHINA INST FOR RADIATION PROTECTION +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite dust moves in pipelines and various types of equipment with the high-temperature helium gas flow, and will carry radioactive nuclides to deposit in some specific parts such as pipelines, the bottom of steam generators, etc., and when the amount of dust deposition reaches a certain level, radioactive hot spots will be formed , will cause harm to the staff who carry out maintenance and daily operation
[0003] In addition, the pebble bed high-temperature gas-cooled reactor uses dry and pure helium as the cooling medium, and the introduction of water into the circuit is strictly prohibited. Therefore, in the decontamination of equipment, wet decontamination should also be avoided as much as possible to avoid water residue, which will affect the future Effects on the operation of the reactor
[0004] At present, the pebble bed high-temperature gas-cooled reactor has little operating experience, and even less decontamination experience and decontamination technology for its graphite dust pollution. The existing decontamination technologies mostly use wet decontamination with water as the base Sewage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: Preparation of decontamination cement and its decontamination test on the manhole simulation piece at the bottom of the steam generator of the pebble bed high temperature gas-cooled reactor (1)

[0049] The formula composition of the decontamination cement prepared by the present embodiment by weight percentage is as follows:

[0050] Cement base material Guar gum 15%, thickener soluble starch 3%, wire drawing additive polyvinyl alcohol 3%, surfactant sodium lauryl sulfate 5%, preservative methylisothiazolinone 2%, thixotropic Agent silicon dioxide 0.1%, stabilizer Tween-80 is 3%, tackifier glycerin 5%, flavoring agent D-limonene citral 0.1%, color indicator dibenzyl sodium sulfonate 0.1%, and the balance is water.

[0051] The specific preparation method of decontamination cement is as follows:

[0052] (1) Gradually add the cement base material of the formula quantity into the water of the formula quantity, and fully stir until uniform;

[0053] (2) Add ...

Embodiment 2

[0056] Example 2: Preparation of decontamination cement and its decontamination test on the manhole simulation piece at the bottom of the steam generator of the pebble bed high temperature gas-cooled reactor (2)

[0057] The formula composition of the decontamination cement prepared by the present embodiment by weight percentage is as follows:

[0058] Clay base locust bean gum 5%, thickener carbo resin 20%, drawing additive xanthan gum 20%, surfactant α-alkenyl sulfonate sodium 10%, preservative kason 0.5%, thixotropic agent organic Bentonite 5%, stabilizer triethanolamine 0.1%, tackifier propylene glycol 0.1%, fragrance D-limonene 0.5%, color indicator pyrimidine ruthenium 0.5%, and the balance is water.

[0059] The specific preparation method of decontamination cement is as follows:

[0060] (1) Gradually add the cement base material of the formula quantity into the water of the formula quantity, and fully stir until uniform;

[0061] (2) Add the ingredients of the cemen...

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PUM

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Abstract

The invention belongs to the technical field of radioactive pollution prevention and control, and relates to decontamination cement and application thereof in radioactive graphite dust pollution removal. The decontaminating cement is prepared from the following components in percentage by part: 5-15% of a cement base material, 3-20% of a thickener, 3-20% of a wiredrawing additive, 5-10% of a surfactant, 0.5-2% of a preservative and the balance of water. When the decontamination cement is used for radioactive graphite dust pollution removal, the operation is simple and convenient, the damage tooperators is small, and obviously better effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of radioactive pollution prevention and control, and relates to a decontamination cement and its application for radioactive graphite dust pollution removal. Background technique [0002] The pebble bed high-temperature gas-cooled reactor is a new type of nuclear reactor. The fuel element of this type of reactor is spherical graphite coated with small fuel particles, with a diameter of about 60mm. , The friction between the ball and the graphite wall, and between the ball and the pipe will generate graphite dust. Graphite dust moves in pipelines and various types of equipment with the high-temperature helium gas flow, and will carry radioactive nuclides to deposit in some specific parts such as pipelines, the bottom of steam generators, etc., and when the amount of dust deposition reaches a certain level, radioactive hot spots will be formed , will cause harm to the staff who carry out maintenance and daily...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/00C08L3/02C08L29/04C08L33/00C08K5/41C08K5/46C08K5/053C08K3/36C08K13/02C09K3/22
CPCC08L5/00C08L33/00C08L2205/025C08L2205/03C09K3/22C08L3/02C08L29/04C08K5/41C08K5/46C08K5/053C08K3/36C08K13/02C08K5/17C08K3/346
Inventor 郭丽潇王秀娟梁栋邓少刚马书林张文俊蒋文江梁宇刘莹王永仙周大为梁大鹏于伟跃杨彪姜子琪李宁张宇航
Owner CHINA INST FOR RADIATION PROTECTION
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