JP2000206293A - Method for treating ion exchange resin in decontamination work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for treating an ion exchange resin in chemical decontamination that needs the fewest possible ion exchange resin towers and makes it possible to locate them in a small space, shorten preparation and restoration work and reduce the exposure dose of radiation. SOLUTION: In a method for treating an ion exchange resin by which chemical decontamination treatment is conducted for pipes or equipment of nuclear power plant facilities by passing a decontamination liquid through an object 15 to be decontaminated and metal ions dissolved by the decontamination liquid and involving radioactive contamination are recovered by an ion exchange resin tower 45 or 46, a resin exhaust nozzle 49 is placed in the ion exchange resin tower 45 or 46 and a used ion exchange resin is transferred from the resin exhaust nozzle 49 through a resin exhaust line 51 to a resin storage tank 64 during decontamination work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating an ion-exchange resin in a decontamination operation in which piping and equipment of facilities in a nuclear power plant are subjected to chemical decontamination.

[0002]

2. Description of the Related Art In a decontamination work in which piping and equipment of a facility in a nuclear power plant are subjected to chemical decontamination, metal ions and chemicals of oxide films accompanied by radioactive contamination dissolved and removed by chemicals are subjected to ion exchange. It is collected in an ion-exchange resin tower filled with resin.

[0003] The amount of ion-exchange resin is determined by the amount of oxide film to be dissolved and removed, and several ion-exchange resin towers filled with the amount of ion-exchange resin capable of recovering the entire amount of oxide film are arranged in a decontamination system. Perform decontamination. The spent ion-exchange resin from which the oxide film has been recovered is stored and stored in a state filled with the ion-exchange resin tower after the completion of decontamination.

Next, the structure of a conventional ion exchange resin tower (hereinafter, referred to as a resin tower) will be described with reference to FIG. FIG. 11 is a longitudinal sectional view showing a part of a conventional resin tower in a side view.
Is a cylindrical resin tower main body, having an upper lid 2 at an upper end opening,
A bottom plate 3 is provided at the lower end opening. A large-diameter disk-shaped upper screen 4 is provided on the lower surface of the upper lid 2, and a plurality of small-diameter disk-shaped lower screens 5 are provided on the upper surface of the bottom plate 3. A resin layer 6 filled with an ion exchange resin (hereinafter, referred to as resin) is accommodated in the resin tower main body 1.

An inlet nozzle 7 penetrating the upper cover 2 from above is attached to the upper cover 2, and an inlet valve 8 is connected to the inlet nozzle 7. An outlet nozzle 9 facing the lower screen 5 is mounted on the bottom plate 3, and an outlet valve 10 is mounted on the outlet nozzle 9. The resin tower body 1, the top lid 2, the bottom plate 3 and the outlet nozzle 9 are accommodated in a shielding container 11.

In FIG. 11, reference numeral 12 denotes a shielding cover of the shielding container 11, which is constituted by a laminated body, and reference numeral 13 denotes a bottom plate of the shielding container 11. The space between the bottom plate 3 of the resin tower 1 and the bottom plate 13 of the shielding vessel 11 is a space region having a nozzle insertion hole 14 for the outlet nozzle 9 and into which the outlet nozzle 9 is inserted.

Here, the decontamination water during the chemical decontamination work flows into the resin tower main body 1 from the inlet nozzle 7 and the upper screen 4
And the resin layer 6. Thereby, the metal ions in the decontaminated water are recovered. The treated water that has passed through the resin layer 6 flows out of the lower screen 5 through the outlet nozzle 9 and is used as washing water for the object to be decontaminated. The resin tower main body 1 is stored in a shielding container 11 to reduce radiation exposure during decontamination work.

[0008]

In the conventional chemical decontamination,
Since the decontamination work is performed by arranging multiple resin towers in the decontamination system that can collect the oxide film amount of all the decontamination target, the decontamination target covers a wide range such as chemical decontamination in the furnace. When the amount of the removed oxide film is large, ten or more resin towers are required. Therefore, there is a problem that it is difficult to secure a place for installing a resin tower having a weight of more than 10 tons including the shielding container 11.

Further, the resin tower has an oxide film having high radioactivity inside the resin tower until the decontamination work is completed,
Since the dose equivalent rate on the surface of the shielding container 11 increases, there are problems such as an increase in the exposure of construction workers due to an increase in the atmospheric dose in the resin tower installation area.

Furthermore, when the oxide film is recovered during the decontamination, the decontamination agent also circulates in the resin tower, so that the resin tower also contains a chemical as a decontamination agent. A chemical such as oxalic acid is a chelating agent, and there is a problem that will cause a problem when a used ion exchange resin containing a chelate is to be disposed of in the future.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the number of resin towers to be used can be minimized, the resin tower can be installed in a small space, the preparation and restoration work time can be shortened, and chemical removal can be achieved. An object of the present invention is to provide a method for treating a resin in chemical decontamination in which the radiation exposure dose of an operator can be reduced by reducing the ambient dose equivalent rate of the dyeing operation. Another object of the present invention is to provide a method for treating an ion-exchange resin in which the future disposal of used resin can be carried out without any problem.

[0012]

Means for Solving the Problems The first aspect of the present invention relates to a chemical decontamination operation in which a decontamination liquid is supplied to a decontamination object for piping or equipment in a nuclear power plant and a chemical decontamination process is performed. In the resin treatment method, a resin discharge nozzle is provided in a resin tower for collecting metal ions accompanying radioactive contamination dissolved in the decontamination solution during the chemical decontamination work, and the resin discharge nozzle is used during the decontamination work. It is characterized by discharging the ion exchange resin.

According to the first aspect of the present invention, in chemical decontamination for piping and equipment of facilities in a nuclear power plant,
In the resin that collects metal ions of the oxide film accompanied by radioactive contamination dissolved by chemicals such as oxalic acid, the resin tower is made dischargeable and the used resin is discharged during decontamination. The number of bases used in the tower can be reduced.

According to a second aspect of the present invention, at least two resin towers are installed in a decontamination line, and when the used resin in one resin tower is discharged from a resin discharge nozzle, the other resin tower is used. The decontamination work of the decontamination line is continued by a tower.

According to the second aspect of the present invention, by preparing two or more resin towers, it is possible to use one of the resin towers to discharge the spent resin while using the other resin tower. Chemical decontamination work can be continued.

According to a third aspect of the present invention, the used resin is temporarily stored in a storage facility such as a resin storage tank and a waste resin storage facility installed in a nuclear power plant.

According to the third aspect of the present invention, a resin tower installation area is provided by temporarily storing used resin generated by chemical decontamination in existing resin storage tanks, waste resin storage facilities, and other storage facilities in a nuclear power plant. Ambient dose equivalent rate can be reduced.

The invention of claim 4 is characterized in that the resin tower is provided with a used resin discharge nozzle, a resin extrusion nozzle and a new resin filling nozzle. According to the invention of claim 4, it is possible to easily discharge the used ion exchange resin from the discharge nozzle and fill the new resin from the filling nozzle during the chemical decontamination.

A fifth aspect of the present invention is characterized in that a temporary pipe or a hose is connected to the resin tower, and the resin in the resin tower is transferred by water and compressed air. According to the fifth aspect of the present invention, by transferring the resin with water and compressed air using a temporary pipe or a hose, the resin transfer operation can be performed efficiently in a short time with less work exposure.

A sixth aspect of the present invention is characterized in that when transferring the resin, a radiation monitor is installed on the surface of a temporary pipe or a hose or in the vicinity thereof to check the transfer state of the resin. According to the invention of claim 6, it is possible to confirm the transfer status of the resin by the increase in the dose equivalent rate by the radiation monitor, and to grasp the blockage position in the event that the resin is blocked,
Radiation exposure of workers during resin transfer can be reduced.

The invention of claim 7 is characterized in that a shield is attached to all or a part of the temporary pipe or hose when transferring the resin. According to the invention of claim 7, it is possible to reduce the radiation exposure of the worker at the time of transferring the resin by attaching a shield to all or a part of the temporary pipe or the hose at the time of transferring the resin.

According to the invention of claim 8, the resin is discharged to a portable shielded resin storage container during decontamination and temporarily stored, and after the decontamination work is completed, the resin storage container is moved to a place where it can be easily transferred. The resin is discharged to a resin storage facility using water, compressed air, or the like via a temporary pipe or a hose. According to the eighth aspect of the present invention, the number of used resin towers can be reduced by discharging the resin into the shielded resin storage container.

According to a ninth aspect of the present invention, there is provided a method for treating a resin during a chemical decontamination operation using a cationic resin and an anionic resin, the method comprising the steps of: The original resin is transferred to a storage facility, and decontamination work is performed in a resin tower. According to the ninth aspect, by switching and using different resins such as a cationic resin and an anionic resin in one resin tower, the number of bases used in the resin tower can be reduced.

According to a tenth aspect of the present invention, before transferring the used resin to the resin storage facility, the chemical decontamination agent in the resin tower is replaced with decontamination system purified water, demineralized water or condensate water outside the system. It is characterized by the following. According to the invention of claim 10, by replacing the chemical decontamination agent in the resin tower with decontamination system purified water, demineralized water or condensate water outside the system, a problem arises in the use of a used ion exchange resin containing no chelating agent. Can be buried without disposal.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a method for treating a resin in chemical decontamination according to the present invention will be described with reference to FIGS. FIG. 1 is a system diagram for explaining the present embodiment. In FIG. 1, reference numeral 15 denotes an object to be decontaminated. Object to be decontaminated 15
A decontamination liquid inflow pipe 16 and a decontamination liquid outflow pipe 17 are detachably connected. On the upstream side of the decontamination liquid inflow pipe 16, a decontamination liquid supply line 19 from the outlet side of the electric heater device 18 and the resin tower 1A,
A washing water supply line 20 from 1B is connected via a valve 21.

The upstream side of the electric heater device 18 is a pump outlet valve.
22, a circulation pump 23, a pump inlet valve 24, a tank outlet valve 25, and a decontamination liquid capacity adjusting tank 26 are sequentially connected. The chemical injection device 2 is provided on the almost upper side of the decontamination liquid volume adjustment tank 26.
7. A chemical outlet valve 28, a chemical pump 29, and a pump outlet valve 30 are connected. A return pipe 31 connected to the chemical liquid injector 27 is connected between the chemical liquid pump 29 and the outlet valve 30 via a stop valve 32.

An exhaust pipe is provided at the top of the tank 26 for adjusting the volume of the decontamination liquid.
33 is connected, and a local exhaust fan 34 is connected to the exhaust pipe 33. In addition, the decontamination liquid capacity adjustment tank 26 and the decontamination liquid outflow pipe 17
The adjustment liquid piping 36 is connected between the valves and via valves 35 and 37. An ultraviolet irradiation device 38 is provided on the inlet and outlet sides of the valve 37.
Are connected by an irradiation loop pipe 41 via an inlet valve 39 and an outlet valve 40.

The tank outlet valve 25 of the decontamination liquid volume adjusting tank 26
A decontamination line 42 is connected between and the cleaning water supply line 20. An auxiliary pump inlet valve 43 and an auxiliary pump 44 are connected between the decontamination line 42 and the washing water supply line 20, and a first resin tower 45 and a second resin tower 45 are provided on the discharge side of the auxiliary pump 44.
Are connected in parallel via an inlet valve 8 and an outlet valve 10, respectively.

A first valve 47 and a second valve 48 are provided in a decontamination line connecting each of the inlet valves 8 and the outlet valve 10. A resin discharge nozzle 49 is connected to the first resin tower 45 and the second resin tower 46, and the resin discharge nozzle 49 is connected to a resin outlet valve 50.
Is connected to the resin discharge line 51 via the.

The structure of the first resin tower 45 and the second resin tower 46 will be described with reference to FIG. In FIG. 2, the same portions as those in FIG. 11 are denoted by the same reference numerals, and the description of the overlapping portions will be omitted. A first difference between the first and second resin towers 45 and 46 from the conventional example shown in FIG.
A large-diameter cylindrical outflow pipe 53 is provided surrounding the new resin filling nozzle 52, the inlet nozzle 7 is connected to the outflow pipe 53, and a plurality of small-diameter upper screens 54 are provided at the lower end of the outflow pipe 53. It has been provided.

The second point is that approximately V
The V-shaped lower screen 55 is provided, and the resin discharge nozzle 49 is connected to the lower end of the V-shaped lower screen 55. The inlet nozzle 7 is branched and connected to a water injection nozzle 56. The new resin filling nozzle 52, the resin discharge nozzle 49 and the water injection nozzle 56 are provided with valves 57, 58 and 50, respectively. The decontamination system water before the treatment flows from the inlet nozzle 7 into the resin tower main body 1 and passes through the resin layer 6 to collect metal ions.

In FIGS. 1 and 2, a circulation pump 23, an electric heater device 18, an ultraviolet irradiation device 38,
Chemical solution injection device 27, decontamination solution volume adjustment tank 26, local exhaust fan
34, auxiliary pump 44 and first and second resin towers 45, 46
The decontamination device composed of is connected to perform chemical decontamination in the object 15 to be decontaminated.

The metal ions accompanying the radiation contamination attached to the object 15 to be decontaminated are dissolved by a chemical, and the first and second metal ions are dissolved.
Are collected in the resin towers 45 and 46 of the refrigeration system. The spent resin from which the metal ions have been recovered is discharged to a resin storage tank or waste resin storage facility installed in a nuclear power plant during decontamination.

FIGS. 3A to 3C show the first resin tower.
An example will be described in which two second resin towers 45 and 46 are installed in a decontamination system and these are switched to perform decontamination. The first resin tower 45 is referred to as tower A, and the second resin tower 46 is referred to as tower B.

FIG. 3A shows that water is passed from the decontamination system to the tower A,
FIG. 3B shows a state in which the resin in Tower A is discharged and water is passed through B and the like, and FIG. 3C shows a state in which the resin in Tower A is filled with new resin. B shows a state in which water is flowing.

That is, as shown in FIG. 3 (a), two towers A and B are connected in parallel between the decontamination line 42 and the washing water supply line 20. Of these, at the start of decontamination, water was passed through only one of the towers A. During the decontamination, when the resin was recovered and the metal was used, as shown in FIG. Inlet valve 8,
The outlet valve 10 is switched to allow water to flow through the tower B.

During the period, the resin in the tower A discharges the used resin, and after discharging as shown in FIG. 3 (c), the new resin is filled in the tower A, and the decontamination work is interrupted by preparing for the next use. The replacement of the resin can be performed without the need for the replacement.

FIG. 4 shows another example of the first resin tower 45 or the second resin tower 46 shown in FIG. 2. The difference from FIG. 2 is that the lower end of the resin tower main body 1 has a bottom plate. 3, a resin discharge nozzle 49a having a length such that the upper end thereof penetrates the upper cover 2 and projects the upper cover 2, and a resin outlet valve 50 is provided at the upper end of the nozzle 49a. . According to this example, there is no need to provide the V-shaped lower screen 55, and the structure can be simplified.

Next, a second embodiment of the present invention will be described with reference to FIGS. This embodiment is the first or second embodiment.
Of transferring the used resin 6a from the resin towers 45 and 46 to a resin storage tank or a waste resin storage facility.

In FIG. 5, a compressed air line 59 and a water supply line 60 are branched and connected to the inlet nozzle 7 connected to the resin tower main body 1 via stop valves 61 and 62, respectively. Further, one end of a temporary pipe 63 is connected to the resin discharge nozzle 49, and the other end of the temporary pipe 63 is connected to a resin storage tank 64. Note that the resin storage tank 64 can be replaced with waste resin storage equipment. The resin storage tank 64 or the waste resin storage equipment is separated by a radiation shielding wall 65.

When the used resin 6a is discharged from the first resin tower 45 or the second resin tower 46 to the resin storage tank 64 installed in the nuclear power plant, the resin discharge nozzle 49 and the resin storage tank 64 Are connected by a temporary pipe 63. Then, water is injected into the resin tower main body 1, the inside of the resin tower main body 1 is pressurized, and the used resin 6a is discharged together with the water. After the spent resin 6a is discharged, the compressed resin flows from the inlet nozzle 7 so that the spent resin remaining in the resin tower main body 1 can be discharged.

FIG. 6 shows that a radiation monitor 66 is provided on each of the temporary pipes 63 inside and outside the radiation shielding wall 65 in FIG. 5 to check the discharge and transfer state of the used resin 6a. That is, by providing the radiation monitor 66 in the temporary pipe 63 for transferring the used resin 6a to the resin storage tank 64, the dose equivalent rate increases during the transfer of the used resin 6a, and the dose equivalent rate increases after the used resin 6a is transferred. Since the equivalent ratio decreases, the transfer state of the used resin 6a can be confirmed.

FIG. 7 shows that a radiation shield 67 is provided on the entire surface or a part of the temporary pipe 63 inside and outside the radiation shield wall 65 in FIG. Thereby, the ambient dose equivalent rate at the time of transfer of the used resin 6a can be reduced, and the radiation exposure of the worker can be reduced.

Next, a third embodiment of the present invention will be described with reference to FIG. In the present embodiment, the first resin tower 45 or the second resin tower is installed in the resin storage device 68 having a portable shield during decontamination.
The used resin 6a in 46 is discharged and temporarily stored, and after the decontamination work is completed, the storage container 68 is moved to a radioactive waste treatment (Rad) building, a temporary pipe 63 is connected and discharged to a resin storage tank 64. Is to do. In FIG. 8, reference numeral 69 denotes a transport trolley, 70
Is a vent pipe, and 71 is a water injection nozzle.

That is, the present embodiment is suitable for a resin disposal method when the used resin 6a cannot be directly discharged from the resin tower to the resin storage tank 64 installed in the nuclear power plant. During the chemical decontamination, the used resin 6a is once discharged into the storage container 68 and stored, and after the decontamination work is completed, the storage container 68 is placed on the transport trolley 69 to a place where the resin storage tank 64 can be easily transferred. Moving. Then, the resin discharge nozzle 49 and the resin storage tank 64 are moved by the temporary piping 63 at that location. Then, the water injection nozzle connected to the storage container 68
Water and compressed air flow from 71 to discharge the used resin 6a.

Next, a fourth embodiment of the present invention will be described with reference to FIG. This embodiment is a method of treating a resin during chemical decontamination using a cationic resin and an anionic resin as an ion exchange resin. In the method of using one of the above resins, when switching to the other resin, the original resin is used. Is transferred to a storage facility and decontamination work is performed without delay in a limited resin tower.

That is, as shown in FIG.
Different resins are used in the same tower by replacing different kinds of resins such as a cationic resin and an anionic resin using a tower. In this case, first, water is passed through the cation resin in the tower A (step 1), and then the spent cation resin in the tower A is discharged into the water passed in the other tower B (step 2). Next, the tower A is filled with the new anion resin (step 2) and can be used as an anion tower (step 3). Therefore, according to the present embodiment, the number of bases of the resin tower can be reduced.

Next, a fifth embodiment of the present invention will be described with reference to FIG. The present embodiment relates to a method of replacing the inside of the resin tower (tower A, tower B) before discharging the used resin 6a, and transfers the used resin 6a to a resin storage facility as shown in FIG. Before the chemical decontamination agent in the resin tower is decontaminated line 42
And demineralized water or condensed water condensed from condensate or condensate injection nozzle 73 branched and connected to inlet nozzle 7 outside the system.

That is, as shown in FIG. 10, before the spent resin is discharged from the tower A, if the decontamination system is purifying, the purified water of the decontamination system is discharged. Brine or condensate is passed through the resin tower to replace high concentrations of chemicals in the resin tower. When the used resin 6a is discharged from the tower B, the inside of the resin tower is similarly replaced. This replaces the inside of the towers A and B with water containing no chelate, so that the used resin 6a can be buried and disposed without any problem.

[0050]

According to the present invention, by discharging used resin during chemical decontamination, the resin tower can be decontaminated with the minimum necessary number of resin towers. Along with this, it is possible to reduce the exposure of workers, and it is possible to reduce high-dose miscellaneous solid waste by reducing the number of resin towers.

[Brief description of the drawings]

FIG. 1 is a system diagram for explaining a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a first example of the resin tower in FIG.

3A is a system diagram showing a state in which the resin tower B is made to stand by in the resin tower A in FIG. 1, and FIG. 3B is a state in which the resin in the resin tower A is discharged and water is passed through the resin tower B. A system diagram showing
(C) is a system diagram showing a state in which resin is filled in resin tower A and water is passed through resin tower B.

FIG. 4 is a longitudinal sectional view showing a second example of the resin tower in FIG.

FIG. 5 is a system diagram for explaining a second embodiment of the present invention.

FIG. 6 is a system diagram showing an example in which a radiation monitor is attached to a temporary pipe in FIG.

FIG. 7 is a system diagram showing an example in which a shield is attached to a temporary pipe in FIG. 5;

FIG. 8 is a system diagram for explaining a third embodiment of the present invention.

FIG. 9 is a process chart for explaining a fourth embodiment of the present invention.

FIG. 10 is a system diagram for explaining a fifth embodiment of the present invention.

FIG. 11 is a longitudinal sectional view showing a part of a conventional ion exchange resin tower in a side view.

[Explanation of symbols]

1, 1A, 1B ... resin tower body, 2 ... top lid, 3 ... bottom plate, 4
... upper screen, 5 ... lower screen, 6 ... resin layer,
6a: Used resin, 7: Inlet nozzle, 8: Inlet valve, 9 ...
Outlet nozzle, 10 ... Outlet valve, 11 ... Shielding container, 12 ... Shielding lid, 13 ... Bottom plate, 14 ... Nozzle insertion hole, 15 ... Object to be decontaminated, 16
... decontamination inflow pipe, 17 ... decontamination outflow pipe, 18 ... electric heater device, 19 ... decontamination liquid supply line, 20 ... washing water supply line, 21
… Valve, 22… Pump outlet valve, 23… Circulation pump, 24… Pump inlet valve, 25… Tank outlet valve, 26… Decontamination liquid capacity adjusting tank, 27… Chemical liquid injector, 28… Chemical liquid outlet valve, 29… Chemical liquid Pump, 30 ... Pump outlet valve, 31 ... Return pipe, 32 ... Stop valve, 33 ...
Exhaust pipe, 34… Local exhaust fan, 35, 37… Valve, 36… Adjustment liquid piping, 38… Ultraviolet irradiation device, 39… Inlet valve, 40… Outlet valve, 41
... irradiation loop piping, 42 ... decontamination line, 43 ... auxiliary pump inlet valve, 44 ... auxiliary pump, 45 ... first resin tower, 46 ... second resin tower, 47 ... first valve, 48 ... second No. 49, Resin discharge nozzle, 50: Resin outlet valve, 51: Resin discharge line, 52: New resin filling nozzle, 53: Outflow pipe, 54: Small diameter upper screen,
55 ... V-shaped lower screen, 56 ... water injection nozzle, 57, 58 ...
Valve, 59… Compressed air line, 60… Water supply line, 61,62…
Stop valve, 63: Temporary piping, 64: Resin storage tank, 65: Radiation shielding wall, 66: Radiation monitor, 67: Radiation shielding body,
68… Portable storage container with shielding, 69… Transportation trolley, 70…
Vent pipe, 71 ... water injection nozzle, 72 ... deionized water or condensate injection nozzle, 73 ... injection valve.

Claims (10)

[Claims] 1. A method for treating an ion-exchange resin in a chemical decontamination operation in which a decontamination liquid is flown to a decontamination target for piping or equipment in a facility in a nuclear power plant and a chemical decontamination treatment is performed. Install a resin discharge nozzle in the ion exchange resin tower that collects metal ions with radioactive contamination dissolved in the decontamination solution during the dyeing work, and discharge the used ion exchange resin from the resin discharge nozzle during the decontamination work A method for treating an ion-exchange resin during decontamination work. 2. The method according to claim 1, wherein the ion-exchange resin tower is installed in at least two decontamination lines, and when the used ion-exchange resin in one ion-exchange resin tower is discharged from the resin discharge nozzle, the other is used. The method for treating an ion-exchange resin during decontamination according to claim 1, wherein the decontamination operation of the decontamination line is continued by the ion-exchange resin tower. 3. The decontamination work according to claim 1, wherein the used ion exchange resin is temporarily stored in a storage facility such as a resin storage tank and a waste resin storage facility installed in the nuclear power plant. Method of ion exchange resin at the time. 4. The ion exchange during decontamination work according to claim 1, wherein the ion exchange resin tower is provided with a discharge nozzle for used ion exchange resin, a resin extrusion nozzle, and a nozzle for charging new resin. Resin treatment method. 5. The decontamination work according to claim 1, wherein a temporary pipe or a hose is connected to the ion exchange resin tower, and the ion exchange resin in the ion exchange resin tower is transferred by water and compressed air. Method of ion exchange resin at the time. 6. The decontamination work according to claim 5, wherein a radiation monitor is installed on or near a temporary pipe or a hose surface when transferring the ion-exchange resin to check the transfer status of the ion-exchange resin. Method of ion exchange resin at the time. 7. The method for treating an ion-exchange resin during decontamination according to claim 5, wherein a shield is attached to all or part of the temporary pipe or hose when transferring the ion-exchange resin. 8. The ion exchange resin is discharged into a portable shielded ion exchange resin storage container during decontamination and temporarily stored therein.
After completion of the decontamination work, move the ion exchange resin storage container to a place where it can be easily transferred, and discharge the ion exchange resin to the ion exchange resin storage facility using water, compressed air, or the like via a temporary pipe or a hose. A method for treating an ion-exchange resin during decontamination work. 9. A method for treating an ion exchange resin during a chemical decontamination operation using a cationic resin and an anionic resin,
At the time of decontamination work characterized in that after using any one of the above resins, the original resin is transferred to a storage facility when used by switching to the other resin, and decontamination work is performed in an ion exchange resin tower. Method of treating ion exchange resin. 10. The chemical decontamination agent in the ion exchange resin tower is replaced with decontamination system purified water, demineralized water or condensate outside the system before transferring the used ion exchange resin to a resin storage facility. The method for treating an ion-exchange resin during the decontamination work according to claim 1, wherein: