KR100826966B1 - Method for producing disposal canister of radioactive waste - Google Patents

Method for producing disposal canister of radioactive waste Download PDF

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Publication number
KR100826966B1
KR100826966B1 KR1020060107165A KR20060107165A KR100826966B1 KR 100826966 B1 KR100826966 B1 KR 100826966B1 KR 1020060107165 A KR1020060107165 A KR 1020060107165A KR 20060107165 A KR20060107165 A KR 20060107165A KR 100826966 B1 KR100826966 B1 KR 100826966B1
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KR
South Korea
Prior art keywords
coating
coating powder
disposal
injection gas
method
Prior art date
Application number
KR1020060107165A
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Korean (ko)
Inventor
김주호
김형준
박동룡
최종원
최희주
Original Assignee
(주)태광테크
재단법인 포항산업과학연구원
한국원자력연구원
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Application filed by (주)태광테크, 재단법인 포항산업과학연구원, 한국원자력연구원 filed Critical (주)태광테크
Priority to KR1020060107165A priority Critical patent/KR100826966B1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/166Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the material to be sprayed being heated in a container
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00Coating starting from inorganic powder
    • C23C24/02Coating starting from inorganic powder by application of pressure only
    • C23C24/04Impact or kinetic deposition of particles
    • GPHYSICS
    • G21NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21FPROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F5/00Transportable or portable shielded containers

Abstract

A method for producing a disposal canister of a radioactive waste is provided to improve reliability by preventing oxidation of coating powder during coating or generation of a remaining tensile stress after the coating. A method for producing a disposal canister of a radioactive waste includes the steps of: heating an injection gas at high pressure(S10); preheating coating powder(S20); transferring the heated injection gas and the preheated coating powder inside a chamber to mix the injection gas and the coating powder(S30); and coating a disposal canister structure by injecting the mixture of the heated injection gas and the preheated coating powder to a surface of the disposal canister structure(S40).

Description

Method for producing disposal canister of radioactive waste

1 is a view showing a cross-section after coating the copper on the spheroidized cast iron according to the method for producing a waste container for radioactive waste of the present invention.

2 is a view showing a cross-sectional structure of FIG.

Figure 3 is a view showing a cross section after coating the copper on the cast iron roll in accordance with the method for producing a disposal container of the radioactive waste of the present invention.

Figure 4 is a flow chart showing a method for producing a disposal container of the radioactive waste of the present invention.

5 is a view showing an example of the configuration of the apparatus according to the method for producing a disposal container for radioactive waste of the present invention.

<Explanation of symbols for main parts of the drawings>

10: injection gas supply source

12: Heating part

20: Coating powder source

22: preheater

30: mixing part

40a: injection part 1

40b: injection part 2

50: Disposal container structure

The present invention relates to a method for manufacturing a waste container for radiation waste, and more particularly, since the disposal container can be manufactured within a short time, the productivity is high, and there is little oxidation of the coating powder during coating or almost no residual tensile stress after coating. It relates to a method for producing a disposal container for this high radiation waste.

In general, radioactive waste is a substance which is contaminated by radioactive material or radioactive material and contains a radionuclide of a certain concentration or more and is not intended for use, and is the object of disposal.

These radioactive wastes are classified into high level radioactive wastes and medium and low level radioactive wastes according to the characteristics of radionuclides contained therein.

High-level radioactive waste is a radionuclide that generates heat of decay, emits high radioactivity, has a heat generation rate of 2 kW / ㎥ or more, and emits alpha rays with a half-life of more than 20 years, and has a radioactivity concentration of 4,000 Bq / g or more. Waste is radioactive waste other than high-level radioactive waste.

On the other hand, the above-mentioned radioactive waste is finally disposed of permanently at a specific place, where disposal means keeping it constant at a specific place so that no future radioactive waste is to be taken out again, that is, hundreds of thousands of meters underground at a depth of several hundred thousand years as short as 500 years. Containing years, it means permanent isolation from humans and natural ecosystems.

In order to transport, handle, or dispose of the radioactive waste, a disposal container for receiving and disposing of radioactive waste in an internal space is used.

Typically, the shape of the disposal container is a cylindrical structure of about 1 m in diameter and 5 m in height (hereinafter, referred to as a disposal container structure) manufactured using carbon steel or cast iron, and 4 to 12 in the inner space of the disposal container. Holds about one sealed waste box.

The disposal container structure is made of carbon steel or cast iron, and the surface of the disposal container structure is made of copper or stainless 316 material which is easy to dissipate heat and has excellent corrosion resistance.

On the other hand, the thickness of the coating material is coated on the surface of the disposal container is about 5 ~ 20 mm depending on the corrosion resistance and life, and may be used by bonding a pipe of copper or stainless 316 material to the disposal container surface.

As described above, the coating material of about 5 to 20 mm on the surface of the disposal container has conventionally been plated or sprayed coating.

Plating is a coating of the surface of a metal material with a thin film of another kind of metal or alloy. In general, electroplating is widely used. Electroplating is a target metal present in an ionic form in an aqueous solution (metal that becomes a direct thin film). Refers to a method of reducing and depositing on the surface of an article using electrical energy to obtain a coating layer.

However, the above-mentioned plating not only needs a large plating bath that can accommodate the disposal container structure, but also has a problem that it takes several weeks or months for a thick coating of 5 to 20 mm.

Thermal spraying is a method of blasting the base substrate to give unevenness and coating it by mechanical bonding.The coating powder material to be coated is melted by various heat sources such as electric arc or plasma and sprayed onto the substrate at a high speed. That's how.

However, because the thermal spray coating dissolves copper or stainless 316 as a heat source, the oxidation of copper or stainless 316 occurs easily, and when sprayed in the air, the desired properties are due to the generation of numerous oxides in the internal structure. There was a problem not getting. On the other hand, in order to prevent the oxidation of the copper or stainless 316 material, the thermal spray coating in a vacuum was almost impossible because a large vacuum chamber must be used.

In addition, the thermal spray coating is a technique of forming a coating layer of a copper material or a stainless 316 material, which is a coating material, from a high-temperature heat source into a molten liquid by colliding with the surface of the disposal container at a high speed to form a quench-solidified film. Due to the thick coating of about 5 to 20 mm, there was a problem that the coating of the copper or stainless 316 material is peeled off.

The present invention has been made in view of the above problems, it is possible to manufacture the disposal container in a short time compared to the plating, so the productivity is high, and there is almost no generation of oxidation of the coating powder during coating or residual tensile stress after coating, it is reliable It is an object of the present invention to provide a method for producing a disposal container for radioactive waste, which is high and can shorten coating time.

The present invention for achieving the above object is a method for manufacturing a radioactive waste disposal container, comprising the steps of: heating a high-pressure injection gas; Preheating the coating powder; Feeding the heated injection gas and the preheated coating powder into a chamber, mixing the mixture, and spraying and coating a mixture of the heated injection gas and the preheated coating powder on the surface of the disposal container structure. It is done.

Preferably, the step of spraying the mixture of the heated injection gas and the preheated coating powder to the surface of the disposal vessel structure, characterized in that the coating by spraying at least two surfaces of the disposal vessel structure at the same time.

Preferably, prior to the step of injecting a mixture of the heated injection gas and the preheated coating powder to the surface of the disposal vessel structure, the aluminum (Al) -based alloy or nickel (Ni) alloy on the surface of the disposal vessel structure Bond coating is characterized in that it further comprises.

Preferably, before the spraying the mixture of the heated injection gas and the preheated coating powder on the surface of the disposal vessel structure, further comprising the step of blasting (sting) on the surface of the disposal vessel structure .

More preferably, the preheating temperature of the copper (Cu) coating powder is characterized in that 100 ℃ ~ 500 ℃.

More preferably, the preheating temperature of the stainless (STS) coating powder is characterized in that 100 ℃ ~ 600 ℃.

Hereinafter, a method for manufacturing a disposal container for radioactive waste of the present invention will be described.

The method for manufacturing a disposal container for radioactive waste of the present invention relates to a method for manufacturing a disposal container using a low temperature spraying method using a low temperature spray device, and specifically, specified in Korean Patent No. 10-0515608 filed by the present applicant. It is preferable to produce a disposal container by making a coating on the surface of the disposal container structure using a low temperature spray method.

Low temperature spraying device collides metal powder particles of 1 ~ 50㎛ size by using high pressure injection gas such as nitrogen, helium, air, and mixed gas to accelerate the particle speed to 300 ~ 1200 m / sec to the base material to be coated. According to, refers to a device that the coating is carried out when the critical speed according to the base material and the coating material is reached.

On the other hand, since the low temperature spraying method using the low temperature spraying device is basically a method in which the metal powder is coated in a solid state, oxidation of the metal powder can be prevented to form a coating layer having the same level of oxidation as the initial metal powder, and thermally. It is also applicable to sensitive metal powders, and there is little residual tensile stress after coating, which facilitates a thick coating of several tens of millimeters.

For example, although the copper coating powder used in the present invention is a thermally sensitive material, even if the copper coating powder is worked in the air, the oxidation degree of the coating powder can be maintained as it is, and in the case of the other coating material stainless steel 316 coating powder Not only can the figure be kept as it is, but the original alloy component can be kept as it is.

On the other hand, in order to coat the copper coated powder or stainless 316 coated powder on the disposal container structure having a diameter of 1 m and a length of 5 m, one cold spraying device may be coated using several spray nozzles, or several cold spraying devices may be applied. It is possible to shorten the process time by coating the coating, and to increase the lamination efficiency of the coating by preheating the coating powder.

On the other hand, work without blasting before coating, or blasting treatment to increase the bonding strength between the coating and the base material, or may be coated after coating 0.1 ~ 0.5 mm of aluminum (Al) or nickel (Ni) as a bond coating.

In general, a bond coating is an aluminum (Al) which is generally excellent in toughness and has a moderate property of a base material and a coating material because of a concern that the coating may be peeled off during use due to various physical property differences (such as strength or thermal expansion coefficient) between the base material and the coating layer. Or nickel (Ni) -based alloy refers to the coating of several tens of micrometers in advance between the base material and the coating layer.

In the method for manufacturing a waste container for radioactive waste according to the present invention, as shown in FIG. 4, a step (S10) of heating a high-pressure injection gas (S10), preheating a coating powder (S20), and the heated injection gas and the preheated The coating powder is fed into the chamber and mixed (S30), and the sprayed mixture of the heated injection gas and the preheated coating powder is sprayed onto the surface of the disposal container structure and includes coating (S40).

First, the step of heating the high-pressure injection gas will be described. (S10)

As the injection gas used to manufacture the disposal container, a high-pressure injection gas such as nitrogen, helium, air or mixed gas is used. It is preferable to heat at 400 degreeC-600 degreeC. On the other hand, the pressure of the injection gas is also preferably set to about 25 ~ 30 kg / cm 2 in consideration of the above problems. However, if the above problem can be overcome, it is obvious to make the heating gas and the pressure of the injection gas higher.

Next, the step of preheating the coating powder will be described. (S20)

The disposal container structure is made of carbon steel or cast iron, and the coating powder coated on the surface of the disposal container uses copper or stainless steel (preferably, stainless 316) which is easy to dissipate heat and has excellent corrosion resistance.

On the other hand, the copper coating powder is preheated to 100 ℃ ~ 500 ℃, stainless 316 coating powder is preferably preheated to 100 ℃ ~ 600 ℃.

This is because when the preheating of the copper coating powder or stainless 316 coating powder is 100 ° C. or less, the coating powder preheating effect is insignificant, and additionally, the coating powder needs to be heat treated to remove moisture from the oven before coating. If the copper coating powder 500 ℃ or more, stainless 316 coating powder 600 ℃ or more because the oxide is formed on the surface of the coating powder is reduced not only the stacking efficiency of the coating, but also because the oxide is likely to occur in the coating.

Finally, the heated injection gas and the preheated coating powder is fed into the chamber and mixed (S30) spraying the mixture of the heated injection gas and the preheated coating powder on the surface of the disposal vessel structure to coat It will be described (S40).

As described above, the injection gas heated through the heating step and the coating powder preheated through the preheating step are supplied into the hermetically sealed chamber along the respective paths, which are mixed with each other in this chamber and disposed of through the injection part communicating with the chamber. It is sprayed onto the surface of the container structure and coated.

In the manufacturing method of the disposal container of the radioactive waste comprising the steps as described above, prior to the step of coating by coating the mixture of the heated injection gas and the preheated coating powder on the surface of the disposal container structure, the surface of the disposal container structure The method may further include bonding the aluminum (Al) -based alloy or the nickel (Ni) -based alloy or blasting the surface of the disposal container structure.

This is to increase the coating force of the coating powder of copper or stainless material is coated on the surface of the disposal container structure by bond coating with aluminum (Al) -based alloy or nickel (Ni) alloy or by blasting on the surface of the disposal container structure.

On the other hand, at least two surfaces of the disposal container structure is preferably sprayed and coated at the same time.

That is, as shown in Figure 5, the injection gas is supplied from the injection gas supply source 10 is heated in the heating unit 12, at this time, a part of the injection gas and the coating powder supplied from the coating powder supply source 20 Together with the preheated in the preheating unit 22, the heated injection gas and the preheated coating powder is mixed in the mixing unit 30, such as a chamber is rotated through the injection unit 1 (40a) and the injection unit 2 (40b) Simultaneous spraying on the surface of the structure.

As described above, in a state in which the disposal container structure is rotated, a mixture of the injection gas heated through the injection parts 1 (40a) and the injection parts 2 (40b) and the preheated coating powder is disposed on at least two surfaces of the disposal container structure. When sprayed and coated at the same time, the working process time can be shortened and productivity is increased.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

<First Embodiment>

Gas used Main gas temperature Powder preheating temperature Powder feeding speed Main gas pressure Distance between gun and board Feed rate of spray gun Number of coating passes  nitrogen  600 ℃  400 ℃  1kg / hr 26kg / cm 2  30 mm  50 mm / sec  15th

Spheroidal cast iron of 10 mm thickness was cut and copper coated using low temperature spraying. As shown in Figure 1, the coating thickness was well coated with about 5 ~ 6mm.

Figure 2 is a view showing the cross-sectional structure of Figure 1, the inner cross-section there is almost no pores and oxides, the powder was plastically deformed showing a crushed form.

Second Embodiment

Gas used Main gas temperature Powder preheating temperature Powder feeding speed Main gas pressure Distance between gun and board Feed rate of spray gun Number of coating passes  nitrogen  500 ℃  300 ℃  3kg / hr 28 kg / cm 2  30 mm  80mm / sec  10th

A 10 mm thick cast iron roll was cut and copper coated using low temperature spraying. As shown in Figure 3, the coating thickness was well coated with about 5 ~ 6mm.

The present invention described above can be embodied in many other forms without departing from the spirit or main features thereof. Therefore, the above embodiments are merely examples in all respects and should not be interpreted limitedly.

According to the present invention configured as described above, it is possible to produce a disposal container within a short time compared to the plating, so that the process time can be shortened, productivity is high, and there is little occurrence of oxidation of the coating powder during coating or residual tensile stress after coating. This is high.

In addition, by simultaneously spraying and coating on at least two surfaces of the disposal container structure, the coating time can be shortened and the productivity is high.

In addition, by coating after coating or blasting the surface of the disposal vessel structure, it is possible to increase the bonding force between the disposal vessel structure and the coating powder.

Claims (7)

  1. In the method of manufacturing a radioactive waste disposal container,
    Heating a high pressure injection gas;
    Preheating the coating powder;
    And feeding and heating the heated injection gas and the preheated coating powder into a chamber, and spraying and coating a mixture of the heated injection gas and the preheated coating powder on the surface of the disposal vessel structure.
    The coating powder is a copper (Cu) or stainless (STS), characterized in that the disposal container of the radiation waste, characterized in that.
  2. The method of claim 1,
    Dispensing the mixture of the heated injection gas and the preheated coating powder on the surface of the disposal container structure, the spray container of the radiation waste, characterized in that the coating by spraying on at least two surfaces of the disposal container structure at the same time Manufacturing method.
  3. The method according to claim 1 or 2,
    Bond coating of the heated injection gas with the preheated coating powder onto the surface of the disposal vessel structure with an aluminum (Al) based alloy or a nickel (Ni) alloy on the surface of the disposal vessel structure Method for producing a disposal container of radioactive waste, characterized in that it further comprises a step.
  4. The method according to claim 1 or 2,
    Before blasting the mixture of the heated spray gas and the preheated coating powder onto the surface of the disposal vessel structure, blasting onto the surface of the disposal vessel structure. Disposal container manufacturing method.
  5. delete
  6. The method according to claim 1 or 2,
    The preheating temperature of the copper (Cu) coating powder is a method for producing a disposal container of radiation waste, characterized in that 100 ℃ ~ 500 ℃.
  7. The method according to claim 1 or 2,
    The preheating temperature of the stainless (STS) coating powder is a waste container manufacturing method, characterized in that 100 ℃ ~ 600 ℃.
KR1020060107165A 2006-11-01 2006-11-01 Method for producing disposal canister of radioactive waste KR100826966B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101520385B1 (en) 2013-08-20 2015-05-15 한국원자력연구원 Vessel for producing radioisotope and the method for manufacturing thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06222197A (en) * 1993-01-25 1994-08-12 Toyo Eng Corp Container for fabricating vitrified radioactive waste
US6887516B2 (en) 2001-10-23 2005-05-03 Valery Korneevich Krysa Method and apparatus for applying a powder coating
KR20050065213A (en) * 2003-12-24 2005-06-29 재단법인 포항산업과학연구원 Cold spray apparatus with powder preheating apparatus
KR100575139B1 (en) * 2004-11-12 2006-04-24 (주)태광테크 Cold spray apparatus with gas cooling apparatus
KR20060071523A (en) * 2004-12-22 2006-06-27 재단법인 포항산업과학연구원 Manufacturing method for electroplated diamond grinding tool

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06222197A (en) * 1993-01-25 1994-08-12 Toyo Eng Corp Container for fabricating vitrified radioactive waste
US6887516B2 (en) 2001-10-23 2005-05-03 Valery Korneevich Krysa Method and apparatus for applying a powder coating
KR20050065213A (en) * 2003-12-24 2005-06-29 재단법인 포항산업과학연구원 Cold spray apparatus with powder preheating apparatus
KR100575139B1 (en) * 2004-11-12 2006-04-24 (주)태광테크 Cold spray apparatus with gas cooling apparatus
KR20060071523A (en) * 2004-12-22 2006-06-27 재단법인 포항산업과학연구원 Manufacturing method for electroplated diamond grinding tool

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101520385B1 (en) 2013-08-20 2015-05-15 한국원자력연구원 Vessel for producing radioisotope and the method for manufacturing thereof

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