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Method for removing radioactive contamination deposited oxide

A technology for oxides and decontamination agents, applied in the fields of radioactive purification, chemical instruments and methods, and cleaning methods using liquids, etc., can solve the problems of unsuitable zinc-injection reactors, difficult to meet the decontamination requirements of deposited oxides, etc. effect of radiation dose

Pending Publication Date: 2022-01-28
CHINA INST FOR RADIATION PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the decontamination agent is only suitable for nuclear pollution decontamination of radioactively contaminated components of nuclear power plants
[0005] Chinese patent application CN 1988051 A describes a nuclear facility radioactive contamination decontamination agent and decontamination method, which uses nitric acid, (NH 4 ) 2 Ce(NO 3 ) 6 The mixed solution is the decontamination medium for ultrasonic decontamination, but this decontamination agent and decontamination method are not suitable for some parts of the zinc injection reactor
[0006] The physical and chemical properties of deposited metal oxides in zinc-injected reactors are significantly different from those in general pressurized water reactors, and the existing radioactive pollution decontamination methods are difficult to meet the decontamination requirements for radioactively contaminated deposited oxides in zinc-injected reactors, namely: The efficiency of removing deposited oxides is greater than 99% without damaging the substrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: the removal of radioactive pollution deposition oxide (one)

[0027] This embodiment is a method for decontaminating radioactive contamination deposited oxides on the pump casing of the RNS waste heat discharge pump MP08 of the zinc injection reactor. The specific steps are as follows:

[0028] (1) Oxidative decontamination with oxidative detergent solution: Potassium permanganate solution with a mass percent concentration of 0.2% was used as the oxidative detergent solution, and the pH value of the solution was adjusted to 2 with nitric acid. Oxidative decontamination control temperature 60-75 ℃, place the MP08 pump casing on the bracket in the decontamination tank and fix it, oxidize and decontaminate for 6 hours under the synergy of ultrasound, and the ultrasonic power density is 30W / cm 2 , Ultrasonic frequency 40KHz.

[0029] (2) Rinsing: using deionized water, ultrasonically coordinated rinsing at 50-70°C for 40 minutes.

[0030] (3) Reductive decon...

Embodiment 2

[0034] Embodiment 2: the removal of radioactive pollution deposition oxide (two)

[0035] This embodiment is a method for decontaminating radioactive contamination deposited oxides on the safety valve bellows of a zinc injection reactor voltage stabilizer. The specific steps are as follows:

[0036] (1) Oxidative decontamination with oxidative detergent solution: Potassium permanganate solution with a mass percent concentration of 0.2% was used as the oxidative detergent solution, and the pH value of the solution was adjusted to 2.5 with nitric acid. Oxidative decontamination control temperature 60-75 ℃, place the bellows of the regulator safety valve on the bracket in the decontamination tank and fix it, and oxidize and decontaminate for 10 hours under the synergy of ultrasound, and the ultrasonic power density is 25W / cm 2 , Ultrasonic frequency 30KHz.

[0037] (2) Rinsing: using deionized water, ultrasonically coordinated rinsing at 60-80°C for 30 minutes.

[0038] (3) Red...

Embodiment 3

[0042] Embodiment 3: the removal of radioactive pollution deposition oxide (three)

[0043] This embodiment is a method for decontaminating radioactive contamination deposited oxides on the spool of the PV01 shut-off valve of a zinc injection reactor. The specific steps are as follows:

[0044] (1) Oxidative decontamination with oxidative detergent solution: Potassium persulfate solution with a mass percent concentration of 0.2% was used as the oxidative detergent solution, and the pH value of the solution was adjusted to 1.5 with nitric acid. Oxidative decontamination control temperature 60-75 ℃, place the PV01 stop valve spool on the bracket in the decontamination tank and fix it, oxidize and decontaminate for 8 hours under the synergistic effect of ultrasound, and the ultrasonic power density is 35W / cm 2 , Ultrasonic frequency 45KHz.

[0045] (2) Rinsing: using deionized water, ultrasonically coordinated rinsing at 60-80°C for 30 minutes.

[0046] (3) Reduction decontamin...

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Abstract

The invention belongs to the technical field of radioactive decontamination, and relates to a method for removing radioactive contamination deposited oxides. The method comprises the following steps: (1) oxidizing and decontaminating a part by using an oxidizing decontaminating agent solution; (2) rinsing the component; (3) reducing and decontaminating by using a reducing decontaminant solution of the part; (4) rinsing the component; and (5) airing the components. According to the method for removing the radioactive contamination deposited oxide, the metal oxide deposited on the surface of the zinc injection reactor component can be removed on the basis of a traditional chemical decontamination technology, and a base body is not damaged.

Description

technical field [0001] The invention belongs to the technical field of radioactive decontamination, and relates to a method for removing radioactive pollution deposited oxides. Background technique [0002] The activated corrosion products deposited on the materials of the main process system of the primary loop of the reactor are the main cause of the collective dose of the nuclear power plant. The zinc injection in the primary loop has a good inhibitory effect on PWSCC, the growth of oxide film on the surface of the material, and the release rate of corrosion products. But at the same time, it also changes the physical and chemical characteristics of the oxide film in the primary circuit. Under the conditions of high temperature and high pressure, the surface of the material is formed in the form of AB 2 o 4 The double-layer oxide film with a spinel structure, zinc ions can replace iron, cobalt, nickel plasma in the inner layer of the spinel structure, and under the cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/00B08B3/08B08B3/12
CPCG21F9/001B08B3/08B08B3/12
Inventor 武明亮崔玉杰王永仙郭丽潇邓少刚赵伟高志婷梁栋高亚华张宇航郭奇张义牛强
Owner CHINA INST FOR RADIATION PROTECTION
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