JP2015087241A - Investigation device and method of radiation contamination degree - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for investigating distribution of radiation contamination degree in a building.SOLUTION: An investigation device 10 of radiation contamination degree comprises: moving means 12 for moving a contamination area 11 contaminated by radioactivity by remote operation; collecting means 14 for collecting a surface deposit from a point 13 in the contamination area 11 which is a movement destination; recognition means 15 for recognizing positional information of the point 13; and a storage part 16 for associating the surface deposits collected from the plural points 13 with the pieces of corresponding positional information for storing.

Description

  Embodiments of the present invention relate to a technique for investigating the degree of radioactive contamination in a building by remote control.

In order to proceed with the recovery work of a nuclear power plant that has caused a radioactive leak accident, it is required to collect radioactive contaminants adhering to the surface of the building and reduce the exposure of workers (for example, Patent Document 1).
In order to perform efficient decontamination of such a building, it is necessary to accurately grasp the distribution of the degree of radioactive contamination in the building.

This grasping work needs to be carried out by remote operation because it is difficult for the worker to enter the building for a long time.
As a method of grasping the state of contamination of a building by such remote operation, a method of detecting a radiation intensity distribution by introducing a moving body equipped with a gamma camera or the like into the building is known.

Japanese Patent No. 4124763

However, in the method of detecting the distribution of the radiation intensity inside the building by a moving body equipped with a gamma camera or the like, the radiation intensity is detected including the intensity of the radiation transmitted through the wall from the outside of the building.
For this reason, the radiation source adheres to the inner surface of the building and can be decontaminated, or cannot be decontaminated outside the building (or inside the piping arranged inside the building). I can't tell you.

  The embodiment of the present invention has been made in view of such circumstances, and provides, for example, a technique for investigating the distribution of radioactive contamination inside the building before or after the start of decontamination work on the building. The purpose is to do.

  In the radioactive contamination investigation device in the embodiment of the present invention, a moving means for moving the radioactive contamination area by remote operation, a collection means for collecting surface deposits from points in the contamination area of the movement destination, Recognizing means for recognizing the position information of the points, and a storage section for storing the surface deposits collected from the plurality of points in association with the corresponding position information.

  Embodiments of the present invention provide a technique for investigating the distribution of radioactive contamination within a building.

(A) is the schematic which shows the state which is spraying adsorbent in the investigation apparatus of the radioactive contamination degree which concerns on 1st Embodiment of this invention, (B) shows the state which has peeled the gelatinized adsorbent. Schematic. The whole figure which shows the investigation apparatus of the radioactive contamination degree which concerns on 2nd Embodiment of this invention. The whole figure which shows the investigation apparatus of the radioactive contamination degree which concerns on 3rd Embodiment of this invention. The whole figure which shows the investigation apparatus of the radioactive contamination degree which concerns on 4th Embodiment of this invention. (A), (B) is the partial schematic diagram of the investigation apparatus of the radioactive contamination degree concerning 5th Embodiment of this invention. The whole figure which shows the investigation apparatus of the radioactive contamination degree which concerns on 6th Embodiment of this invention.

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, the radioactive contamination survey device 10 (hereinafter simply referred to as “survey device 10”) according to the first embodiment includes a moving means 12 for moving the radioactive contamination area 11 by remote control, Collecting means 14 for collecting surface deposits from a point 13 in a destination contamination area, recognition means 15 for recognizing position information of the points 13, and the position information corresponding to surface deposits collected from a plurality of points 13 And an accommodating portion 16 for accommodating in association with each other.

The investigation device 10 according to each embodiment exemplifies a case where the purpose is to investigate the contamination status in the building of a nuclear power plant that has caused a radiation leakage accident.
In such a case, it is necessary to decontaminate the building to a workable level in order to take out the nuclear fuel left inside the nuclear power plant for the convergence of the accident.

At that time, since the decontamination is inefficient, the efficiency is poor. Therefore, before starting the decontamination work, the investigation device 10 is remotely operated in the building to check the contamination status such as the position and type of the contaminant and the intensity of the contamination. Accurately grasp and select an appropriate decontamination method.
Further, even after the decontamination work is completed, the effect of the decontamination work can be confirmed by operating the investigation apparatus 10 in the building.

Examples of the moving means 12 include wheels, crawlers, leg mechanisms (see FIG. 6), and the like, which are selected according to the floor condition of the radioactive contamination area (working area) 11.
If the power of the moving means 12 is the power supplied by the power cable, the work can be performed for a long time. Further, if the battery or fuel mounted on the moving means 12 is used as a power source, the operation can be performed without hindering the operation of the cable.

The collecting means 14 is mounted on the moving means 12 and collects surface deposits from the point 13 in the contaminated area of the moving destination.
The collecting means 14 includes a spray unit 21 that injects an adsorbent 17a that gels and adsorbs surface deposits as shown in FIG. 1 (A), and an adsorbent 17b that gels as shown in FIG. 1 (B). The hand part 22 which peels and accommodates in the accommodating part 16 and the arm part 23 which supports and operates at least one among the spray part 21 and the hand part 22 are provided.

The spray part 21 is detachably provided at the tip of the arm part 23, and sprays a liquid adsorbent 17a called so-called strippable paint toward the point 13 and applies it to the target surface.
Then, the adsorbent 17b applied to the target surface gels and adsorbs the surface deposit, and when it is peeled off from the target surface, the radioactive contaminant present at the point 13 is collected.

The application of such strippable paint is preferable in that the spraying method is less contaminated on the investigation apparatus 10 and does not require fine control.
However, the application method of strippable paint is not particularly limited, and for example, a method of applying with a roller, a method of applying with a brush, and the like are also conceivable.

As shown in FIG. 1A, the hand unit 22 is in a standby state on the moving means 12 while the spray unit 21 is in operation. Then, after applying the adsorbent 17 a to the point 13, the tip of the arm portion 23 is exchanged from the spray portion 21 to the hand portion 22.
Then, the hand part 22 and the arm part 23 are operated, and the gelled adsorbent 17 b is peeled off from the point 13 and accommodated in the accommodating part 16.

For the purpose of preventing contamination on the investigation device 10 side and accurately measuring the radiation dose of the adsorbent 17b accommodated, the hand unit 22 may be wrapped with a disposable sheet, and this sheet may be replaced for each collection. There is also a method of exchanging the nail or spatula of the hand unit 22 or the suction port.
In addition, as a method of collecting the gelled adsorbent 17b, there is a method of scraping with a spatula or adsorbing in addition to the method of pinching with the illustrated hand unit 22.

A section for collecting surface deposits can be defined by installing the formwork 24 at the point 13 by the hand unit 22.
Thereby, the collection amount of the surface deposit at the point 13 can use the area defined by the mold 24 as an index, and the reproducibility of the collection position is also ensured.

The arm part 23 has a configuration in which the base end is fixed to the moving means 12 and the spray part 21 and the hand part 22 are detachably supported at the tip. The tip of the arm portion 23 has a movable range from the vicinity of the ground contact surface of the moving means 12 to the accommodating portion 16.
In addition, the arm part 23 is good also as a structure supported by the front-end | tip of a respectively independent arm other than the case where the spray part 21 and the hand part 22 are comprised so that replacement | exchange is possible as illustrated.

The recognition unit 15 includes, for example, a monitoring camera and a communication device, and contributes to the movement of the investigation device 10 and the recognition of the position information of the point 13 by remote operation.
In addition, when the CAD data of the structure in the contaminated area 11 exists, this CAD data and the data of the monitoring camera are collated, and the movement of the investigation apparatus 10 and the position setting of the point 13 can be performed.

Each of the adsorbents 17b obtained by collecting the surface deposits from the plurality of points 13 in the contaminated area 11 is stacked on the storage unit 16 from the bottom in the order of collection.
Thereby, the order of the adsorbent 17b laminated | stacked and the order of the collection position of the point 13 are linked | related.
In the accommodating part 16, the plurality of adsorbents 17 b accumulated are provided with a blocking sheet 18 in order to prevent the surface deposits contained therein from being mixed with each other.

(Second Embodiment)
As shown in FIG. 2, in the radioactive contamination survey device 10 according to the second embodiment, the sampling means 14 has a first supply unit 31 that supplies a wiping cloth 32 and a point by grasping the wiping cloth 32. And a gripping portion 33 that rubs the surface of 13.
2 that have the same configuration or function as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

The radioactive contamination survey device 10 according to the second embodiment employs a smear method.
The smear method is a method for evaluating the degree of surface contamination by wiping a predetermined area of the surface of an object with a wiping cloth 32 such as filter paper or a chemical cloth and measuring the amount of attached radioactive material.

The 1st supply part 31 accumulates in order to supply the unused wiping cloth 32. FIG.
The grip portion 33 is provided at the tip of the arm portion 23, and the arm portion 23 is operated to grip the wiping cloth 32 from the first supply portion 31.

Then, the grip portion 33 is moved to the vicinity of the point 13, and the surface deposit is adsorbed to the wiping cloth 32 by rubbing the surface thereof.
Each of the wiping cloths 32 on which the surface deposits are adsorbed is accommodated in the accommodating portion 16 from the bottom in the order of collection. Thereby, the order of the adsorbent 17b laminated | stacked and the order of the collection position of the point 13 are linked | related.

(Third embodiment)
As shown in FIG. 3, in the radioactive contamination investigation device 10 according to the third embodiment, the sampling means 14 includes a first nozzle head 41 that forms a closed space 42 by bringing the opening into contact with the surface of the point 13, and A first injection unit (not shown) that sprays dry ice on the surface of the point 13 exposed in the closed space 42 to separate the surface deposits from the surface, and collects the surface deposits scattered in the closed space 42. A replaceable filter 43 and a second supply unit 45 that supplies the filter 43 are provided.
3, parts having the same configuration or function as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

The first nozzle head 41 is provided at the tip of the arm portion 23 and has a deep drawing shape having an opening. The opening is brought into contact with the surface of the point 13 to form a closed space 42.
The closed space 42 is connected via a hose 46 to a first injection unit (not shown) that injects dry ice.

When dry ice is ejected from the first ejection unit (not shown), the surface deposit on the point 13 exposed in the closed space 42 is scraped off and scattered in the closed space 42.
The scattered surface deposits are collected by a filter 43 provided in the closed space 42.
Each of the filters 43 adsorbing the surface deposits is accommodated in the accommodating portion 16 from the bottom in the order of collection. Thereby, the order of the filter 43b laminated | stacked and the order of the collection position of the point 13 are linked | related.

  The second supply unit 45 stores unused filters 43a. After the used filter 43 b is stored in the storage unit 16, the unused filter 43 a from the second supply unit 45 is set in the first nozzle head 41 by the operation of the arm unit 23.

(Fourth embodiment)
As shown in FIG. 4, in the radioactive contamination investigation device 10 according to the fourth embodiment, the sampling means 14 includes a second nozzle head 51 that forms a closed space 52 by bringing an opening into contact with the surface of the point, and this A second spraying unit that sprays the cleaning liquid 53a onto the surface of the point 13 exposed in the closed space 52 and separates surface deposits from the surface.
4, parts having the same configuration or function as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

The second nozzle head 51 is provided at the tip of the arm portion 23 and has a deep drawing shape having an opening. The opening is brought into contact with the surface of the point 13 to form a closed space 52.
The closed space 52 is connected to a second injection unit 54 that injects the cleaning liquid 53a through a hose 57a.

The 2nd injection part 54 injects cleaning liquid 53a on the surface of point 13 exposed to this closed space 52, and separates surface deposits from this surface.
The separated surface deposits are dispersed in the cleaning liquid 53b and collected in the accommodating portion 55 via the hose 57b.
This accommodating part 55 is comprised with a some container, and the washing | cleaning liquid 53b containing a surface deposit | attachment is each accommodated in a separate accommodating part 55 in the order collected. Thereby, the order of the cleaning liquid 53b including the surface deposit is associated with the order of the collection positions of the points 13.

  The second nozzle head 51 is provided with an ultrasonic wave generating unit 60, which irradiates the cleaning liquid 53 a filled in the closed space 52 with ultrasonic waves to promote the separation of the surface deposit on the point 13.

(Fifth embodiment)
As shown in FIG. 5, in the radioactive contamination survey device 10 according to the fifth embodiment, the second nozzle head 51 has a configuration that can be replaced while holding the cleaning liquid 53b containing the separated surface deposits. .
5 that have the same configuration or function as those in FIG. 4 are denoted by the same reference numerals, and redundant description is omitted.

The second nozzle head 51 is provided with a partition wall 58 that divides the closed space 52 into a lower first section 52a and an upper second section 52b.
The partition wall 58 is provided with a check valve 59 that allows only the flow from the first section 52a to the second section 52b. A hose 57a for injecting the cleaning liquid 53a is connected to the first section 52a.

When the cleaning liquid 53a is sprayed from the hose 57a to the first section 52a, the surface deposit on the exposed point 13 is separated from the surface. The separated surface deposit is dispersed in the cleaning liquid 53b, passes through the check valve 59, and is collected in the second section 52b.
In the process of the cleaning liquid 53b moving from the first section 52a to the second section 52b, the air in the second section 52b is released from the gas vent hole 56.
When the second section 52b is filled with the cleaning liquid 53b, the arm portion 23 is moved to displace the second nozzle head 51 in the upward direction. And the 2nd nozzle head 51 is accommodated in the accommodating part 16 (refer FIG. 3) in the state with which the washing | cleaning liquid 53b was hold | maintained.
The cleaning liquid 53b present in the first section 52a remains on the floor surface.

(Sixth embodiment)
As shown in FIG. 6, in the radioactive contamination survey device 10 according to the sixth embodiment, the moving means 12 is composed of a legged walking robot 12b.
In FIG. 6, parts having the same configuration or function as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.
As shown in FIG. 6, according to the leg walking robot 12b, it is possible to work by attaching the spray part 21 and the hand part 22 to the leg part.

  In the above description, as the moving means 12 for moving the radioactively contaminated area 11, the embodiment of moving while touching the floor surface has been shown. Those that move in the air can also be employed.

  According to the radioactive contamination survey apparatus of at least one embodiment described above, the distribution of radioactive contamination in a building is obtained by collecting surface deposits from a plurality of points in the radioactive contamination area by remote control. Can be investigated.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, changes, and combinations can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 10 ... Investigation apparatus, 11 ... Contamination area, 12 ... Movement means, 12b ... Leg walking robot, 13 ... Point, 14 ... Collection means, 15 ... Recognition means, 16 ... Storage part, 17 (17a, 17b) ... Adsorbent, DESCRIPTION OF SYMBOLS 18 ... Blocking sheet, 21 ... Spray part, 22 ... Hand part, 23 ... Arm part, 24 ... Formwork, 31 ... First supply part, 32 ... Wiping cloth, 33 ... Gripping part, 41 ... First nozzle head, 42 ... Closed space, 43 (43a, 43b) ... Filter, 45 ... Second supply section, 46 ... Hose, 51 ... Second nozzle head, 52 ... Closed space, 52a ... First section, 52b ... Second section, 53 (53a, 53b) ... cleaning liquid, 54 ... second injection part, 55 ... accommodating part, 56 ... gas vent, 57a, 57b ... hose, 58 ... partition wall, 59 ... check valve, 60 ... ultrasonic generator.

Claims (10)

Moving means to move radioactively contaminated areas by remote operation;
Sampling means for collecting surface deposits from points in the contaminated area of the destination;
Recognition means for recognizing the position information of the point;
And a storage unit for storing the surface deposits collected from the plurality of points in association with the corresponding position information. In the survey device of the radioactive contamination degree of Claim 1,
The collecting means includes
A spray unit that sprays an adsorbent that gels and adsorbs the surface deposit;
A hand part that peels off the gelled adsorbent and accommodates it in the accommodating part;
And an arm for supporting and operating at least one of the spray unit and the hand unit. In the radiological contamination degree investigation device according to claim 2,
A radioactivity contamination investigation device using a mold that is installed at the point by the hand unit and defines a section where the surface deposits are collected. In the survey device of the radioactive contamination degree of Claim 1,
The collecting means includes
A first supply unit for supplying a wiping cloth;
And a gripping part that grips the wiping cloth and rubs the surface of the point. In the survey device of the radioactive contamination degree of Claim 1,
The collecting means includes
A first nozzle head that forms an enclosed space by bringing an opening into contact with the surface of the point;
A first injection unit that injects dry ice onto the surface of the point exposed in the closed space to separate the surface deposit from the surface;
A replaceable filter for collecting the surface deposits scattered in the closed space;
And a second supply unit that supplies the filter. In the survey device of the radioactive contamination degree of Claim 1,
The collecting means includes
A second nozzle head that forms an enclosed space by bringing an opening into contact with the surface of the point;
A second spraying unit that sprays cleaning liquid onto the surface of the point exposed in the closed space to separate the surface deposit from the surface of the point;
The accommodating portion is
An apparatus for investigating the degree of radioactive contamination, wherein the cleaning liquid containing the separated surface deposits is collected and stored separately in association with the position information. In the survey device of the radioactive contamination degree of Claim 6,
The second nozzle head is
It has a configuration that can be replaced while holding the cleaning liquid containing the separated surface deposits,
The accommodating portion is
An apparatus for investigating the degree of radioactive contamination, wherein the cleaning liquid is collected together with the second nozzle head and stored separately in association with the position information. In the survey device for radioactive contamination according to claim 6 or claim 7,
The second nozzle head is provided with an ultrasonic wave generation unit for irradiating an ultrasonic wave to the cleaning liquid filled in the closed space. In the radioactivity pollution investigation device according to any one of claims 1 to 8,
The radioactive contamination investigation device characterized in that a blocking sheet for preventing the surface deposits associated with different position information from intermingling is interposed in the housing portion. Moving the radioactively contaminated area remotely,
Collecting surface deposits from points in the contaminated area of the destination;
Recognizing position information of the point;
And storing the surface deposits collected from the plurality of points in association with the corresponding position information.

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