KR100727011B1 - Magnetic decontamination system of large size pipe solid radioactive waste by permanent magnet - Google Patents

Abstract

A magnetic decontamination system of a solid radioactive waste is provided to prevent a worker from being exposed to a strong acid for a decontamination process by decontaminating a pipe of a large size without using the strong acid. A magnetic decontamination system of a solid radioactive waste includes a decontamination vessel(20), a magnetic field generation unit(30), a casing(10), a cleaning water supply unit(40), and a cleaning water processing unit(50). The decontamination vessel(20) has an abrasive of magnetic substance or diamagnetic substance. The decontamination vessel(20) has an inlet unit and an outlet unit, and is supported by a pair of supporting axes installed on both sides. The magnetic field generation unit(30) is supported by a bearing installed on the supporting axes, and is installed to cover a circumference of the decontamination vessel(20). The magnetic field generation unit(30) applies a variable magnetic field to the abrasive of the inside of the contamination vessel(20). The casing(10) is installed on a side part of the contamination vessel(20), and has a rotation driving unit which rotates the magnetic field generation unit(30) supported by the bearing. The cleaning water supply unit(40) supplies cleaning water to the inlet unit of the decontamination vessel(20). The cleaning water processing unit(50) processes the cleaning water exhausted from the outlet unit of the decontamination vessel(20).

Description

Magnetic decontamination system of large size pipe solid radioactive waste by permanent magnet}

1 is a view showing the configuration of a solid radioactive waste self-decontamination equipment according to the present invention,

2 is a perspective view showing an extract of the magnetic field generating device employed in FIG.

3 is a cross-sectional view along the line III-III 'of FIG.

4 is a view for explaining a permanent magnet disposed on the intermediate disk of FIG.

5 is a view showing an extract of the transfer crane for transporting the decontamination object to the decontamination vessel of FIG.

<Description of the symbols for the main parts of the drawings>

10 ... casing 11 ... heat sink

13 ... Control panel 15 ... Rotary drive

16 ... motor 17 ... first gear

18 ... 2nd Gear 19 ... Chain

20 ... Decontamination vessel 21 ... Inlet

22 ... Drainage 23 ... Support shaft

24 ... bearing 26 ... cover

26a ... Handle 30 ... Magnetic field generator

35 ... first magnetic field generating unit 36a, 36b ... first, second disc

36 c ... intermediate disc 37 ... permanent magnet

38 ... 2nd magnetic field generator 40 ... Washing water supply device

40a ... Wheels 41 ... Washing water supply line

42 ... washing water supply valve 50 ... washing water treatment system

50a ... Wheel 51 ... Washing and drainage line

52 ... water drain valve 53 ... sheave

54 ... Bag filter 55 ... Drain line

56 ... Drain valve 58 ... Sub-wash water supply line

59 ... subwash water supply valve 60 ... jig

61 ... jig body 61a ... first pin hole

62 ... jig support 62a ... second pin hole

63 ... Pin 70 ... Removable Crane

71 ... cylinder 72 ... rope

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid radioactive waste self-decontamination facility, and more particularly, to radioactive pollutants remaining on the inner and outer surfaces of metallic or non-metallic solid radioactive waste such as large pipes generated during the operation and decommissioning of nuclear facilities. The present invention relates to a solid radioactive waste self-decontamination facility capable of decontamination in a magnetic manner.

In general, when operating or dismantling a nuclear power facility, solid radioactive waste in the form of metallic or non-metallic large pipes (hereinafter referred to as decontamination objects) is generated. Since radioactive contaminants remain on the inner and outer surfaces of the decontamination object, if thrown away as it is, it may cause fatal environmental pollution. Therefore, it is important to reliably remove radioactive contaminants remaining on the decontamination object.

Conventionally, the removal of radioactive pollutants remaining in solid radioactive waste proceeds by physical decontamination using a brush, high pressure water or ultrasonic cleaning, or by chemical decontamination using electrolytic acid or electrolytic decontamination.

However, when the radioactive contaminants are removed from the decontamination object by the physical decontamination method or the chemical decontamination method, there is always a possibility that the worker performing decontamination is exposed to radiation, which is very dangerous.

In addition, since there were many differences in decontamination efficiency depending on the type and shape of the decontamination target, it was not clear whether decontamination was in progress. In particular, chemical decontamination or electrolytic decontamination mainly uses strong acids, so during the decontamination process, workers could inhale strong acids, which could lead to fatal diseases. Furthermore, strong acids used to corrode liquid waste treatment systems.

The present invention has been made to solve the above problems, to provide a solid radioactive waste self-decontamination apparatus that can exclude the possibility of workers exposed to radiation during the decontamination of solid radioactive waste consisting of large pipes. The purpose.

Another object of the present invention is solid decontamination equipment for solid radioactive waste which can eliminate the possibility of being exposed to strong acid since the decontamination is possible even if there are various kinds and shapes of decontamination objects, and strong acid is not used. To provide.

In order to achieve the above object, the solid radioactive waste self-decontamination facility according to the present invention, the abrasive (G) consisting of a magnetic material or a diamagnetic material is accommodated therein, the inlet 21 and the drain 22 is formed, A cylindrical decontamination vessel 20 supported by a pair of support shafts 23 positioned at both sides; A magnetic field supported by a bearing 24 provided on the support shaft 23 and installed to surround the decontamination vessel 20 to apply a magnetic field that is changed to the abrasive G in the decontamination vessel 20. Generator 30; A casing (10) installed at the side of the decontamination vessel (20), the casing (10) having a rotational drive unit (15) for rotating the magnetic field generating device (30) supported by the bearing (24); A washing water supply device 40 for supplying the washing water to the inlet 21 of the decontamination vessel 20; And a washing water treatment device (50) for treating the washing water that has undergone the washing drained from the drain port (22) of the decontamination vessel (20).

In the present invention, as installed inside the decontamination vessel 20, the weight is heavy or heavily contaminated with radioactivity further comprises a jig 60 for supporting a decontamination object difficult to handle by hand, or a lot of weight Or it may further include a mobile crane 70 for moving the decontamination object difficult to handle by hand due to severe contamination with radioactivity to the decontamination vessel (20).

In the present invention, the magnetic field generating device 30, a pair of first magnetic field generating unit 35 for applying a magnetic field that is changed at both ends of the decontamination vessel 20, and the pair of first magnetic field generating unit ( And a second magnetic field generating part 38 installed at an edge of 35 to apply a magnetic field changed at the outer circumferential surface side of the decontamination vessel 20. At this time, the first magnetic field generating unit 35 is fixed to the second gear 18 of the rotary driving unit, and is positioned at first and second discs 36a and 36b at predetermined intervals. An intermediate disk 36c fixed inside the binary disks 36a and 36b, and a plurality of permanent magnets 37 provided in the intermediate disk 36c. In addition, the second magnetic field generating unit 38 is formed at the edge of the first magnetic field generating unit 35 and is formed in the form of a bar located around the outer circumferential surface of the decontamination vessel 20, and a plurality of permanent magnets therein. 37 is installed and made.

In the present invention, a cover 26 is installed on the decontamination vessel 20 to prevent the radioactive pollutant in the form of particulates generated during decontamination.

In the present invention, the washing water treatment device 50, the sieve 53 which can recover and wash the abrasive (G) contained in the washing water, and is installed on the lower side of the sheave 53 is included in the washing water Bag filter 54 for treating the radioactive contaminants in the form of particulates, and a drain tank line 55 for transferring the washing water through the bag filter 54 to a drain tank (not shown).

In the present invention, the washing water treatment device 50 is connected to the washing water supply device 40 through the subwashing water supply line 58, the subwashing water supply line 58 has a subwashing water supply valve 59 Is installed.

Hereinafter, with reference to the accompanying drawings, a solid radioactive waste self-decontamination facility according to the present invention will be described in detail.

1 is a view showing the configuration of a solid radioactive waste self-decontamination apparatus according to the present invention, Figure 2 is a perspective view showing the magnetic field generating device employed in Figure 1, Figure 3 is a III-III 'of FIG. 4 is a view for explaining a permanent magnet disposed on the intermediate disk of Figure 3, Figure 5 is a view showing an extract of the transfer crane for transporting the decontamination object to the decontamination vessel of FIG. .

As shown, the solid radioactive waste self-decontamination facility according to the present invention, the abrasive (G) consisting of a magnetic material and / or diamagnetic material is accommodated therein, the inlet 21 and drain 22 are formed, both sides A cylindrical decontamination vessel 20 supported by a pair of support shafts 23 positioned thereon; The magnetic field generating device is supported by the bearing 24 installed on the support shaft 23 and is installed to surround the decontamination vessel 20 to apply a magnetic field that is changed into the abrasive G in the decontamination vessel 20. 30; A casing (10) installed on the side of the decontamination vessel (20), the casing (10) having a rotational driving portion (15) for rotating the magnetic field generating device (30) supported by the bearing (24); A washing water supply device 40 for supplying the washing water to the inlet 21 of the decontamination container 20; It includes; washing water treatment device 50 for treating the washing water that has undergone the washing drained from the drain 22 of the decontamination vessel (20).

The casing 10 is provided with a heat dissipation fan 11 for discharging heat generated when the motor 16 of the rotation driving unit 15 to be described later is operated. By providing the heat radiating fan 11, overheating of the motor 16 can be prevented.

The control panel 13 is installed on the front portion of the casing 10. The control panel 13 includes a power switch for turning on / off power applied from the outside, a motor operation switch for operating the motor 16 and the heat radiating fan 11, and a rotation for adjusting the rotation speed of the motor 16. A water control switch, a timer switch for setting the decontamination time, and an alarm indicating that decontamination is completed are installed. Since the control panel 13 is provided on the front portion of the casing 10, the self-decontamination facility of the present application can be easily operated.

The rotation driving unit 15 is for rotating the magnetic field generating device 30 in a state supported by the bearing 24 installed on the support shaft 23, and may be implemented in various forms. In the present embodiment, the rotation drive unit 15 is a motor 16 mounted on the casing 10, a first gear 17 fixed to the rotation shaft of the motor 16, and a rotation center of the magnetic field generating device 30. And a second gear 18 fixed to the belt, and a belt or chain 19 connecting the first gear 17 and the second gear 18 to each other.

The lower portion of the casing 10 may be provided with a moving wheel (not shown) for moving the casing 10, in which case the casing 10 can be easily moved to another place.

The magnetic field generating device 30 applies a magnetic field that is changed into the decontamination vessel 20 at both ends and the outer circumferential side of the cylindrical decontamination vessel 20. The magnetic field generating device 30 is provided at the edges of the pair of first magnetic field generating units 35 and the pair of first magnetic field generating units 35 for applying a magnetic field that is changed at both ends of the decontamination vessel 20. It consists of a second magnetic field generating portion 38 for applying a magnetic field that is changed on the outer peripheral surface side of the decontamination vessel (20).

The first magnetic field generating unit 35 may be manufactured in various forms. In the present embodiment, the first magnetic field generating unit 35 is fixed to the second gear 18, and the first and second discs 36a and 36b are positioned at predetermined intervals. And an intermediate disk 36c fixed inside the first and second disks 36a and 36b, and a plurality of permanent magnets 37 installed in the intermediate disk 36c. Here, the intermediate disk 36c is divided into eight sectors having a fan shape with respect to the center thereof, and a plurality of permanent magnets 37a are provided in the even division so that the N pole faces upward, and the odd division has the S pole. A plurality of permanent magnets 37b are installed to face the upper portion. In this way, the permanent magnet is spaced in the partitioned portion of the intermediate disk 36c, and the N pole and the S pole are alternately (N pole-S pole-N pole-S pole-N pole-S pole-N pole-S pole). When installed, the magnetic field changes instantaneously than the single pole (N pole-S pole), so that the abrasive in the decontamination vessel 20 vibrates more violently up / down / left / right, The surface is polished efficiently.

The second magnetic field generating unit 38 may be manufactured in various forms. In this embodiment, the second magnetic field generating unit 38 is installed at the edge of the first magnetic field generating unit 35 and is formed around the outer circumferential surface of the decontamination container 20. A plurality of permanent magnets 37 are installed on the bar. Here, the permanent magnet is installed on the even bar so that the N pole faces the decontamination vessel 20, and on the odd bar, the S pole faces the decontamination vessel 20. In this way, if the permanent magnets are installed in even and odd bars with N poles and S poles alternately (N pole-S pole-N pole-S pole-N pole-S pole-N pole-S pole), a single pole Since the magnetic field changes instantaneously than the (N pole-S pole), the abrasive in the decontamination vessel 20 vibrates more violently up / down / left / right to efficiently polish the surface of the decontamination object. .

The washing water supply line 41 connected to the washing water supply device 40 is detached from the inlet 21 formed at the upper side of the decontamination container 20. The inlet 21 may be coupled with a sealing stopper (not shown) so that the washing water is not discharged to the outside when decontamination proceeds.

A lid 26 is installed on the decontamination vessel 20 so as not to be released to the outside of the secondary radioactive pollutant in the form of particulates generated during decontamination, and a handle 26a is installed on the lid 26. The cover 26 may be fastened to be sealed to the top of the decontamination vessel 20 by a fastening member (not shown).

The washing water supply device 40 is for washing some of the radioactive contaminants remaining on the surface of the abrasive G and the decontamination object P in the decontamination vessel 20 after decontamination. To this end, the washing water supply device 40 is connected to the inlet 21 through the washing water supply line 41, the washing water supply valve 42 is installed in the washing water supply line 41 to control the transfer of the washing water. With this structure, when the washing water supply valve 42 is opened, the washing water supply device 40 may supply the washing water to the decontamination vessel 20 through the washing water supply line 41.

In addition, the lower portion of the washing water supply device 40 is provided with a moving wheel (40a) for moving the washing water supply device 40, it is possible to easily move the washing water supply device 40 to the place.

The washing water treatment apparatus 50 is for safely treating the washing water drained from the decontamination vessel 20 after decontamination. To this end, the washing water treatment apparatus 50 is connected to the drain 22 through the drain 22 through the washing water draining line 51, and to the washing water draining line 51 to control the transfer of the drained washing water. The valve 52 is installed. By this structure, when opening the washing water drain valve 52, the fresh water drained from the decontamination vessel 20 can be drained to the washing water treatment device (50).

The washing water treatment device 50 is for safely treating particulate or liquid secondary radioactive pollutants contained in the drained washing water and recovering the abrasive (G). To this end, the washing water treatment apparatus 50 includes a sieve 53 capable of recovering and washing the abrasive G included in the washing water, and a secondary particle having a particulate form installed in the lower side of the sieve 53. A bag filter 54 of several tens of micrometers or less for treating radioactive pollutants, and a drain tank line 55 for transferring the washing water passing through the bag filter 54 to a drain tank (not shown). At this time, the sump line 55 is provided with a sump valve 56.

The washing water treatment device 50 is connected to the washing water supply device 40 through a separate subwashing water supply line 58, and the subwashing water supply line 58 is provided with a subwashing water supply valve 59. The sub-wash water supply line 58 supplies clean washing water to the washing water treatment device 50 to wash the abrasive G recovered from the sieve 53.

The lower portion of the washing water treatment device 50 is provided with a moving wheel 50a for moving the washing water treatment device 50, and thus, the washing water treatment device 50 can be easily moved to another place.

On the other hand, inside the decontamination vessel 20 is longer than the radius of the decontamination vessel 20, the jig 60 for supporting the decontamination object (P) that is difficult to handle by hand due to a lot of weight or radioactive contamination is installed is installed It may be, and the movable crane 70 for transferring the jig 60, the decontamination object (P) is supported to the decontamination vessel 20 may be employed.

The jig 60 includes a jig main body 61 supported at the bottom of the decontamination vessel 20 and a jig support 62 protruding upward from the jig main body 61. At this time, a pair of first pin holes 61a are formed at the side of the jig body 61, and a plurality of second pin holes 62a having a constant interval in the lateral direction are formed in the jig support 62. Therefore, when the pin 63 penetrating the first pin hole 61a is inserted into the second pin hole 62a at a specific position, the protruding position of the jig support 62 with respect to the jig body 61 can be varied. And, accordingly, the height of the decontamination object P supported by the jig support 62 can be adjusted.

The movable crane 70 moves the jig 60 on which the decontamination object P is seated to the decontamination vessel 20. At this time, the movable crane 70 is provided with a cylinder 71 for elevating the rope 72 for hanging the decontamination object P to the lower side, and the wheel 70a for movement is installed at the lower side.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

As described above, according to the solid radioactive waste self-decontamination apparatus according to the present invention, it is possible to exclude the possibility that the worker is exposed to radiation during the decontamination progress.

In addition, even a large pipe of the decontamination object can be surely decontaminated, and since no strong acid is used, it is possible to exclude the possibility of exposure of the strong acid to the worker who proceeds with decontamination.

In addition, since the radioactive pollutants in the form of particulates generated during the decontamination process are treated by the bag filter and the liquid radioactive waste is disposed of by the drainage tank, it is possible to eliminate the possibility of polluting the environment by the discharge of the liquid radioactive waste.

And if the decontamination object is heavy or longer than the radius of the decontamination vessel, and severely contaminated with radioactivity, it can be transported to the decontamination vessel using mobile cranes and jigs, so that the operator may not have to directly contact the decontamination object. It works.

Claims (10)

A cylindrical decontamination vessel, in which an abrasive (G) composed of a magnetic substance or a diamagnetic substance is received, an inlet port 21 and a drain port 22 are formed and supported by a pair of support shafts 23 positioned at both sides ( 20); A magnetic field supported by a bearing 24 provided on the support shaft 23 and installed to surround the decontamination vessel 20 to apply a magnetic field that is changed to the abrasive G in the decontamination vessel 20. Generator 30; A casing (10) installed at the side of the decontamination vessel (20), the casing (10) having a rotational drive unit (15) for rotating the magnetic field generating device (30) supported by the bearing (24); A washing water supply device 40 for supplying the washing water to the inlet 21 of the decontamination vessel 20; And Solid-state radioactive waste self-decontamination apparatus comprising a; washing water treatment device for processing the washing water that has undergone the washing drained from the drain port 22 of the decontamination vessel (20). According to claim 1, It is installed inside the decontamination container 20, and further comprises a jig 60 for supporting a decontamination object (P) that is difficult to handle by hand because of heavy weight or severely contaminated with radioactivity. Solid radioactive waste self-decontamination equipment characterized in that. The method of claim 2, The mobile crane 70 further includes a mobile crane 70 for moving the decontamination object P, which is difficult to handle by hand due to heavy weight or severely contaminated with radioactivity, to the decontamination vessel 20. The mobile crane 70 includes the decontamination. Solid radioactive waste self-decontamination equipment, characterized in that the cylinder (71) is provided for raising and lowering the rope (72) hanging the object (P) to the lower side. The method according to any one of claims 1 to 3, The magnetic field generating device 30 includes a pair of first magnetic field generating units 35 for applying a magnetic field that is changed at both ends of the decontamination vessel 20, and edges of the pair of first magnetic field generating units 35. Solid-state radioactive waste self-decontamination equipment, characterized in that it comprises a second magnetic field generating portion 38 is installed to apply a magnetic field that is changed on the outer peripheral surface side of the decontamination vessel (20). The method of claim 4, wherein The first magnetic field generating unit 35 is fixed to the second gear 18 of the rotary drive unit, and includes first and second discs 36a and 36b positioned at predetermined intervals, and the first and second discs. (36a) (36b) solid radioactive waste self-decontamination equipment, characterized in that it comprises an intermediate disk (36c) fixed in the interior, and a plurality of permanent magnets (37) installed on the intermediate disk (36c). The method of claim 5, The intermediate disk 36c is divided into sectors having a fan shape with respect to the center thereof, and a plurality of permanent magnets 37a are installed in even-numbered partitions of the intermediate disk 36c so that the N poles face upwards. Solid radioactive waste self-decontamination equipment, characterized in that a plurality of permanent magnets (37b) is installed in the compartment so that the S pole toward the top. The method of claim 4, wherein The second magnetic field generating portion 38 is formed at the edge of the first magnetic field generating portion 35 and is formed in the form of a bar located around the outer circumferential surface of the decontamination vessel 20. Solid radioactive waste self-decontamination equipment, characterized in that is installed. The method according to any one of claims 1 to 3, The upper portion of the decontamination vessel 20 is a solid radioactive waste self-decontamination facility, characterized in that the cover (26) is installed to prevent the radioactive pollutant in the form of particulates generated during decontamination to the outside. The method according to any one of claims 1 to 3, The washing water treatment apparatus 50 includes a sieve 53 capable of recovering and washing the abrasive G included in the washing water, and a radioactive contamination in the form of particulates installed in the lower side of the sieve 53. Solid radioactive waste self-decontamination equipment, characterized in that it comprises a bag filter 54 for processing the material, and a drain tank line 55 for transferring the washing water passing through the bag filter 54 to a drain tank (not shown). . The method according to any one of claims 1 to 3, The washing water treatment device 50 is connected to the washing water supply device 40 through the subwashing water supply line 58, and the subwashing water supply line 58 is provided with a subwashing water supply valve 59. Solid radioactive waste self-decontamination equipment.

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