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Decontamination process for radioactive source tank

A source tank and process technology, applied in the field of radioactive source source tank decontamination technology, can solve the problems of intractable source tank processing and complex geometric structure, and achieve the effects of reducing pressure, avoiding lead smoke pollution, and reducing decontamination treatment.

Pending Publication Date: 2022-04-15
SICHUAN ENVIRONMENTAL PROTECTION ENG CO LTD CNNC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the above-mentioned problems in the prior art, the present invention provides a decontamination process for radioactive source canisters to solve the technical problem that the existing source canister processing technology encounters the difficulty in handling source canisters with complex geometric structures when disposing of radioactive source canisters

Method used

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  • Decontamination process for radioactive source tank

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Effect test

Embodiment 1

[0035] The source item of the No. 1 source tank was measured, the weight was 1244Kg, the α surface pollution level was not detected, and the β surface pollution level was 31.6Bq / cm 2 , Part of the paint on the surface of the source tank is peeling off. Due to surface contamination level 2 , so open high-pressure water is used for flushing and decontamination, the flushing pressure of high-pressure water is 110Mpa, and the flushing time is 7min. The source tank is blown dry with compressed air, and holes are drilled from the bottom of the source tank. The radioactive waste generated by the hole is tested and put into steel drums for disposal. Install the No. 1 source tank after opening the hole in a hot-melt lead extraction device with an industrial natural gas furnace as the heat source, control the temperature of the tank body at 360-370°C, and heat for 2 hours. After the lead is completely melted and separated from the source tank body, it enters the container In the proces...

Embodiment 2

[0038] The source item of the No. 2 source tank was measured, the weight was 2056Kg, the α surface pollution level was not detected, and the β surface pollution level was 56.1Bq / cm 2 , The paint on the surface of the source tank is more peeled off. Due to surface contamination level > 40Bq / cm 2 , so closed high-pressure water is used for flushing and decontamination, the flushing pressure of high-pressure water is 120Mpa, and the flushing time is 12min. The source tank is blown dry with compressed air, and holes are drilled from the bottom of the source tank. The radioactive waste generated by the hole is tested and put into steel drums for disposal. Install the No. 2 source tank after opening the hole in a hot-melt lead extraction device with an industrial natural gas furnace as the heat source, control the temperature of the tank body at 360-370°C, heat for 4.5 hours, and wait until the lead is completely melted and separated from the source tank body to enter the container...

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Abstract

The invention discloses a decontamination process for radioactive source tanks, and relates to the technical field of radioactive source tank treatment, the process provided by the invention comprises the following steps: (1) according to the pollution level of the outer surfaces of the source tanks, the source tanks are divided into two types, one type is a high pollution source tank with the outer surface pollution level being greater than 40Bq / cm < 2 >, and the other type is a low pollution source tank with the outer surface pollution level being less than or equal to 40Bq / cm < 2 >; (2) cleaning and decontaminating with high-pressure water: washing and decontaminating the high-pollution-source tank with closed high-pressure water, and washing and decontaminating the low-pollution-source tank with open high-pressure water; (3) locally forming holes in the decontaminated source tank, wherein the holes are used for lead in the interlayer to flow out after being molten; (4) the source tank with the holes formed is installed on a hot melting lead taking device; (5) heating to 350-370 DEG C, melting the lead, separating the lead from the source tank body through the hole formed in the step (3), enabling the lead liquid to enter a container, and carrying out ingot casting on the lead liquid according to metallurgical specifications; and (6) determining the pollution level of the lead ingot.

Description

technical field [0001] The invention relates to the technical field of radioactive source tank treatment, in particular to a radioactive source tank decontamination process. Background technique [0002] With the rapid development of the nuclear industry, radioactive sources are widely used in various fields such as nuclear energy, aerospace, medical treatment, and scientific research. However, radioactive sources are highly radioactive, and radioactive source tanks (hereinafter referred to as source tanks) need to be used as shielding containers during the storage and transportation of radioactive sources. The source tank is mainly composed of an outer container (generally made of iron-based material), a sleeve, and a lining in the container (generally made of lead). During the use of the source tank, it will inevitably be damaged and contaminated by radioactivity, so that it cannot continue to be used. Decontamination of discarded radioactive source tanks can reduce the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/30G21F9/34
Inventor 明晓亮曾宇峰李伟任晓军张志勇杨刚
Owner SICHUAN ENVIRONMENTAL PROTECTION ENG CO LTD CNNC
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