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Nuclear power station high-dose-rate mixed dry waste temporary storage decay treatment method

A technology with high dose rate and treatment method, applied in dosimeters, nuclear engineering, measuring devices, etc., can solve the problem of dry waste temporary storage time without quantitative calculation and analysis, no establishment of high dose rate miscellaneous dry waste, increase manpower, material resources and personnel. Exposure dose and other issues, to achieve the effect of reducing exposure dose and exposure risk, reducing disposal costs, and ensuring verifiability

Active Publication Date: 2021-02-09
CNNC NUCLEAR POWER OPERATION MANAGEMENT +1
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Problems solved by technology

[0003] The existing high dose rate miscellaneous dry waste treatment of nuclear power plants has the following problems: 1. There is no standard process for high dose rate miscellaneous dry waste treatment; 2. The current treatment method increases the volume of radioactive waste; 3. High dose rate miscellaneous dry waste There is no quantitative calculation and analysis of the temporary storage time, and regular measurement is required, which increases manpower, material resources and personnel exposure dose

Method used

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  • Nuclear power station high-dose-rate mixed dry waste temporary storage decay treatment method

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Embodiment Construction

[0034] The present invention provides a nuclear power plant high dose rate miscellaneous dry waste temporary storage decay treatment method, comprising the following steps:

[0035] 1. Collect radioactive miscellaneous dry waste from nuclear power plants, and measure the surface dose rate of radioactive miscellaneous dry waste with a gamma dose rate meter. The distance between the measurement point and the item is 0.01m, which is recorded as D′; according to the measurement results, the surface dose rate exceeds 2mSv High dose rate radioactive miscellaneous dry waste per hour; low dose rate miscellaneous dry waste with a surface dose rate of less than 2mSv / h is put into a 200L steel drum for drying, and the drum is pre-compacted, and the drum is super compacted, 2-4 A 400L steel drum filled with overpressure cakes is fixed by grouting.

[0036] 2. The high dose rate miscellaneous dry waste screened in step 1 includes high dose rate miscellaneous dry waste that is easy to mix u...

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Abstract

The invention relates to a nuclear power station high-dose-rate mixed dry waste temporary storage decay treatment method, which comprises the following steps of 1, performing nuclide analysis and measurement on high-dose-rate mixed dry waste, and determining radionuclide types and initial activity; 2, calculating decay time t1 required for the surface dose rate of the high-dose-rate mixed dry waste to reach 2mSv / h according to the radionuclide type and the initial activity determined in the step 1; 3, putting the high-dose-rate mixed dry waste into a barrel for temporary storage, wherein the temporary storage time is longer than decay time t1; 4, after the temporary storage time is up, taking back the barrel in the step 3, and measuring the barrel surface dose rate; and 5, returning to thestep 1 if the barrel surface dose rate exceeds 2mSv / h according to the measurement result of the step 4, and circulating the operation until the barrel surface dose rate is less than 2mSv / h. The treatment method is standardized, high in operability and high in safety margin.

Description

technical field [0001] The invention belongs to the technical field of radioactive waste treatment, and in particular relates to a method for temporarily storing and decaying high dose rate miscellaneous dry waste of a nuclear power plant. Background technique [0002] High dose rate miscellaneous dry waste refers to a type of radioactive dry waste with a surface dose rate ≥ 2mSv / h. General treatment method: Miscellaneous dry waste with a surface dose rate ≥ 2mSv / h is fixed in a 400L steel drum or a 2000L cement drum with cement, and the volume of the waste is increased by 2-2.5 times; Miscellaneous dry waste with a surface dose rate < 2mSv / h is collected and dried Drying, pre-compression of 200L steel drums, super compaction and grouting of 400L steel drums, the volume of waste is reduced by about 4.5 times. [0003] The existing high dose rate miscellaneous dry waste treatment of nuclear power plants has the following problems: 1. There is no standard process for high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/36G21F9/30G01T1/167G01T1/02
CPCG21F9/36G21F9/301G01T1/02G01T1/167
Inventor 余达万徐宏明杨永亮姜春辉余达宇欧阳涛赵凯平孙凯超毛丰伟
Owner CNNC NUCLEAR POWER OPERATION MANAGEMENT
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