KR101407706B1 - Decontamination Apparatus for Radioactive Waste Using High Pressure Water Jet - Google Patents

Abstract

The present invention relates to a device for decontaminating radioactive waste with high pressure water comprising a cleaning chamber (10), a transfer unit (20), a spray unit (30), a high-pressure water supply unit (40), and a control unit (50). The cleaning chamber (10) is installed inside a decontaminated object (1). The transfer unit (20) is installed in the outside of the cleaning chamber (10) and comprises a first transfer rail (21) which is installed in a horizontal direction; a second transfer rail (22) which is vertically installed in the first transfer rail (21) and is horizontally moved along the first transfer rail (21); a third transfer rail (23) which is horizontally installed in the second transfer rail (22) and is vertically moved along the second transfer rail (22); and a fixing clamp (24) which is connected to the third transfer rail (23) and is moved along the third transfer rail (23). One end of the spray unit (30) is installed in the fixing clamp (24) of the transfer unit (20). The other end of the spray unit (30) is installed inside the cleaning chamber (10). The high-pressure water supply unit (40) comprises a flow path (41) which supplies clean water to the spray unit (30) and a pump (42) which supplies the clean water at the maximal pressure clean water through the flow path (41). The control unit (50) controls the transfer unit (20) and the high-pressure water supply unit (40). The present invention is provided to stably decontaminate the decontaminated object.

Description

Technical Field [0001] The present invention relates to a decontamination apparatus for radioactive waste,

The present invention relates to a radioactive waste decontamination apparatus using ultra-high-pressure water, and more particularly, to a radioactive waste decontamination apparatus using ultra high-pressure water for decontaminating radioactive contaminated materials such as replacement parts and accessories, ≪ / RTI >

In the case of repairing equipment that is installed and operated in a nuclear power plant management area (radioactive area), the replacement parts or tools are exposed to radioactivity during the work process. When moving out of the area, it is required to be removed or reused after decontamination.

In order to carry out the decontamination operation, conventionally, the equipment exposed to radioactivity (hereinafter, referred to as a "decontamination object") is collected, and the operator manually decontaminates the decontamination object by spraying the decontamination liquid. Not only a lot of time is spent but also there is a problem that an exposure dose is increased due to exposure to radiation in the process of the operator decontaminating the decontamination object for a long time.

Therefore, various decontamination apparatuses have been developed and used to solve the above problems. As one example thereof, a method of mixing decontamination material by mixing a friction material with a decontamination liquid and spraying the abradant with the decontamination material onto the surface of the decontamination object A decontamination apparatus, for example, a control system for a multi-nozzle spray-decontamination apparatus and a system using the same, disclosed in Laid-Open Patent Publication No. 10-2012-56452. In the case of using a decontamination solution containing an abrasive as a decontamination agent, There is a possibility that the surface of the object may be worn, and when the decontamination is completed, the abrasive incorporated into the decontamination liquid must be treated separately.

Accordingly, a decontamination apparatus using only ultra-high pressure water in a liquid state as a decontamination liquid has been developed and used. An example of such a decontamination apparatus is the ultra-high pressure hydraulic desalination apparatus disclosed in Japanese Patent Registration No. 307040.

As shown in FIG. 1, the ultra-high pressure hydraulic desalination system disclosed in the above patent document is made of a stainless steel wire mesh of square shape, and has a basket 110 containing a decontamination object therein and a basket 110 containing a decontamination object, (130) for transporting the decontamination object to the overhead crane (130), and a minute event (140) for spraying the ultra high pressure water after the basket (110) containing the object to be decontaminated by the overhead crane A decontamination chamber 120 including a decontamination chamber 120 for allowing a user to decontaminate; A circulation water pump 210 and a purifying filter 220 for circulating and filtering the deionized water discharged after the decontamination operation by the decontamination unit and a decontamination water storage tank for storing the decontamination water purified by the purification filter 220 A decontamination water storage tank 230 installed at one side of the decontamination water storage tank 230 for replenishing and mixing the decontamination liquid and a decontamination water storage tank 230 for circulating the decontamination water supplied from the decontamination water storage tank 230 at a high pressure And a high-pressure hydrotreater pump (240) for supplying the high-pressure hydrotreating pump (240). And an operation control panel 300 for centrally controlling the decontamination portion and the decontamination water supply portion. By injecting high-pressure water to the decontamination object by using a plurality of minute events, The radioactive material can be removed.

However, in such a decontamination facility, the decontamination performance differs depending on the installation position of the decomposition chamber in the decontamination chamber, and in order to achieve uniform decontamination and effective decontamination, the decomposition chamber is moved not only in the left- The decontamination water can not reach the whole of the decontamination object, and thus it is difficult to obtain a decontamination performance uniformly.

In addition, since the decontamination facility disclosed in the patent document has a structure in which the angle of installation of the minute event is adjusted, it is difficult to accurately know to which part of the decontamination object the decontamination water is sprayed, and thereby it is easy to achieve uniform decontamination throughout the decontamination object not.

In this patent document, ultra-high pressure water of about 250 bar is used as the decontamination water. However, effective and reliable decontamination can not be achieved by such low pressure decontamination water, and when the operating pressure of the decontamination water is increased to a high pressure, However, in the above structure, it is difficult to use ultra-high pressure decontamination water because it does not ensure the structural integrity of the disposal event for spraying the decontamination water of ultra-high pressure and the disposal event installation.

The present invention has been devised to solve the problems of the conventional radioactive waste decontamination apparatus using high-pressure water, and it is possible to achieve uniform and effective decontamination performance for various shapes of decontamination object, The present invention has been made to provide a radioactive waste decontamination apparatus using ultra-high pressure water which can precisely control the position of the radioactive waste.

According to an aspect of the present invention, there is provided a radioactive waste decontamination apparatus comprising: a cleaning chamber having a closed structure and having a decontamination object installed therein; A second conveyance rail installed outside the cleaning chamber and horizontally installed, a second conveyance rail vertically installed on the first conveyance rail and horizontally moved along the first conveyance rail, a second conveyance rail horizontally installed on the second conveyance rail, A third transferring rail installed vertically along the second transferring rail and a fixing clamp coupled to the third transferring rail and moved along the third transferring rail; An injection unit, one end of which is fixed to the fixing clamp of the transfer unit and the other end is inserted into the inside of the cleaning chamber; An ultra-high-pressure water supply unit including a flow path connected to be supplied with wash water to the spray unit and sprayed, and a pump for supplying wash water through the flow path at ultra-high pressure; And a control unit for controlling the transfer unit and the ultra-high-pressure water supply unit.

In this case, it is preferable that the decontamination object is placed inside the washing chamber, and the index table is rotated by 360 ° under the control of the control unit.

It is preferable that a jig for fixing the decontamination object is provided on one side of the index table.

It is also preferable that the pump is supplied by pressurizing the washing water to 40,000 psig or more.

It is more preferable that the cleaning chamber is provided with an opening through which the other end of the injection unit is drawn, and the shielding member is closely attached to the outer circumferential surface of the opening so that the shielding member can be shielded even when the injection unit moves.

In addition, the shielding members include a pair of first shielding films which are provided at one end to be in contact with each other and are folded in the horizontal direction; And a pair of second blocking films which are overlapped with the first blocking films and are folded in the vertical direction, and the ejecting unit is disposed between the pair of first blocking films and between the pair of second blocking films, It is more preferable to be installed inside.

Since the conveying unit is constructed in a rail structure, it is structurally robust and stable decontamination is achieved even when ultra-high-pressure water is injected. Further, since the position of the injection unit is precisely controlled in three axial directions by the conveying unit, It can be sprayed at an appropriate position, so that the decontamination can be accurately performed.

Further, since the present invention is carried out on the index table on which the decontamination object rotates, more effective and uniform decontamination can be achieved.

Further, since the decontamination is performed only at a very high pressure of 40,000 psig or more, which is not mixed with the abrasive, the surface of the decontamination object is not worn or damaged, and more effective and strong decontamination can be achieved.

1 is a view showing an example of a conventional radioactive waste decontamination apparatus using ultra high-pressure water,
FIG. 2 is a perspective view showing an example of a decontamination apparatus for radioactive waste using ultra-high-pressure water according to the present invention,
Figure 3 is a side view of Figure 2,
Fig. 4 is a plan view of Fig. 2,
5 is a flowchart illustrating an operation of the decontamination apparatus using ultra high-pressure water according to the present invention.

Hereinafter, the structure and operation of the present invention will be described in detail with reference to the accompanying drawings, which show preferred embodiments.

The present invention provides a decontamination apparatus capable of effectively and uniformly decontaminating radioactive waste using ultrahigh pressure water. To this end, the decontamination apparatus of the present invention comprises a washing chamber 10, Unit 20, an injection unit 30, an ultra-high-pressure water supply unit 40, and a control unit 50. [

The cleaning chamber 10 has a rectangular box shape and has an airtight structure. A proper space is provided in the interior of the cleaning chamber 10 so that the decontamination object 1 can be accommodated. On the one side wall thereof, the decontamination object 1 is placed in the cleaning chamber 10, And an opening 11 is formed in the other wall to allow the injection unit 30, which will be described later, to be introduced into the interior of the door.

A rail R is installed on the floor so as to be connected to the inside of the cleaning chamber 10 so that the decontamination object 1 can be placed inside the cleaning chamber 10 through the door D, The decontamination object 1 conveyed to the inside of the washing chamber 10 by the rail R is conveyed to the index table 13 to be described later by a crane (not shown) installed on the ceiling of the washing chamber 10 .

The opening 11 formed so as to allow the injection unit 30 to be drawn into the cleaning chamber 10 is provided with an ultrahigh pressure injector 30 which is injected from the injection unit 30 when the installation position of the injection unit 30 is moved under the control of an operator, A shielding member 12 for preventing water and radioactive material emitted from the decontamination object from leaking out of the cleaning chamber 10 is closely attached to the wall surface of the cleaning chamber 10. [

3, the shielding member 12 includes a pair of first shielding films 12A which are provided at one end to be in contact with each other and are folded in the horizontal direction, and a pair of first shielding films 12A, And a pair of second cut-off films 12B folded to a predetermined angle.

One end of the injection unit 30 is inserted through a space formed by crossing one ends of the pair of first and second blocking films 12A and 12B by the shielding member 12 having the above structure, The first and second blocking films 12A and 12B are held in close contact with the outer circumferential surface of the ejection unit 30 using an elastic body such as a spring and as a result the ejection unit 30 is moved by the feeding operation of the feeding unit 20 The pair of first and second barrier membranes 12A and 12B are appropriately folded or unfolded correspondingly to the position so that the outer peripheral surface of the injection unit 30 and the wall surface of the cleaning chamber 10 are in close contact with each other The state is maintained.

In the meantime, a disk-shaped index table 13, which is controlled to rotate at 360 degrees by a control unit 50 described later, is installed in the washing chamber 10. The index table 13 has a rotating shaft (not shown) (Not shown) is connected to and rotated by a motor (not shown). At this time, the rotation angle and speed of the motor are controlled precisely by the control of the control unit 50, It is preferable that a servo motor is used as the motor.

The decontamination object located on the index table 13 is rotated and decontaminated by the structure of the index table 13 as described above. As a result, more effective and uniform decontamination can be achieved.

A jig 14 for fixing the decontamination object placed on the upper surface of the index table 13 is provided on one side of the index table 13. The jig 14 includes a vertical rail 14A having a vertical length, And a fixing arm 14B which is raised and lowered along the vertical rail 14A and is height-adjusted and which is pressed and fixed so that the upper surface of the decontamination object 1 is rotatable. The decontamination object is firmly fixed on the index table 13 while the height and the fixing position of the fixed arm 14B are adjusted in accordance with the size and shape of the decontamination object placed on the upper surface of the index table 13, Pressure decontamination water jetted from the high-pressure decompression object 30 is pressurized, the decontamination object is stably maintained while the installation position of the decontamination object is maintained.

A transfer unit 20 is installed outside the cleaning chamber 10 so as to transfer the injection unit 30 inserted through the opening 11 formed in the wall surface of the cleaning chamber 10 to an appropriate position, The unit 20 includes a first conveying rail 21 installed horizontally on the floor of the building as shown in Figs. 2 to 4, a second conveying rail 21 installed vertically on the first conveying rail 21, A second conveyance rail 22 horizontally moved along the rail 21 and a third conveyance rail 23 installed horizontally on the second conveyance rail 22 and vertically moved along the second conveyance rail 22, And a fixed clamp 24 installed on the third conveying rail 23 and moved in the horizontal direction along the third conveying rail 23.

First, second and third screw shafts 21A, 22A and 23A are provided on the first, second and third conveying rails 21, 22 and 23 in the longitudinal direction thereof. Drive motors 21B, 22B and 23B are provided at one end of each of the drive motors 21A, 22A and 23A. These drive motors 21B, 22B and 23B are controlled by a control unit 50.

The second feed rail 22 is coupled to the first screw shaft 21A and the third feed rail 23 is coupled to the second screw shaft 22A. 24 are combined.

When the first, second and third screw shafts 21A, 22A and 23A are rotated by the rotation motions of the drive motors 21B, 22B and 23B by the structure of the transfer unit 20 as described above, The fixing position of the fixing clamp 24 is precisely controlled while the three feeding rails 22 and 23 and the fixing clamp 24 are moved so that the mounting position of the injection unit 30 fixed to the fixing clamp 24 Is finely controlled.

The second and third conveying rails 22 and 23 are controlled to be conveyed by the screw shaft (screw coupling). Alternatively, the second and third conveying rails 22 and 23 may be controlled by the screw shaft 2 conveying rails 21 and 22 and the rack and the pinion so that the second and third conveying rails 22 and 23 are conveyed.

It is also possible to provide a pair of second and third conveying rails 22 and 23 on one first conveying rail 21, respectively.

The injection unit 30 is fixed to the fixed clamp 24 of the transfer unit 20. The injection unit 30 is connected to the flow path 41 of the ultra high pressure water supply unit 40, And a spray nozzle 32 disposed at an end of the pipe 31 for spraying water and connected to the spray nozzle 31 at the end of the pipe 31 32 are vertically and horizontally arranged at angles of 30 to 45 degrees, and one or more of them are installed.

In addition, it is preferable that a limit sensor (not shown) or the like is provided at an adjacent position of the injection nozzle 32. Accordingly, during the movement of the position of the injection unit 30 by the operation of the transfer unit 20, The collision of the unit 30 with the opening 11 and the decontamination object 1 is prevented.

The one end of the injection unit 30 is conveyed by the conveying operation of the conveying unit 20 by being fixed to the fixing clamp 24 and the other end is conveyed through the opening 11 of the cleaning chamber 10 The ultra-high pressure water supplied through the flow path 41 is supplied into the washing chamber 10 and then sprayed to the decontamination object 1 through the spray nozzle 32. [

Pressure water supply unit 40 for supplying the ultra-high-pressure water to the injection unit 30 is provided with a flow path 41 connected to the injection unit 30 and supplied with the ultra-high-pressure water, a water tank 43 storing wash water, The washing water is pressurized to 40,000 psig or more, and decontamination is more reliably performed by the ultra-high pressure water.

The operation of the transfer unit 20 and the ultra-high-pressure water supply unit 40 is controlled by the control unit 50. The control unit 50 controls the transfer unit 20 in accordance with the size (height and width) And the index table 13 provided in the cleaning chamber 10 is rotated 360 degrees by controlling the movement of the nozzle unit 20 appropriately so that the injection unit 30 is moved to a proper position. So that the water is uniformly sprayed onto the surface of the decontamination object (1).

According to the present invention, the decontamination operation can be performed in accordance with the size and shape of the decontamination object 1, so that more effective decontamination can be performed. To this end, the control unit 50 is provided with an input An apparatus (input panel) is provided. In the following, the procedure by which an operator controls the control unit 50 will be described with reference to FIG.

First, the worker controls the position of the transfer unit 20 to be located at the origin with reference to the index table 13 in a work waiting state in which main power of the decontamination apparatus is applied. In this state, the worker moves the decontamination object transfer cranes The decontamination object 1 is placed in the index table 13 inside the washing chamber 10. Then,

Then, the operator uses the input device of the control unit 50 to determine the top and bottom sizes of the decontamination object, the shape of the decontamination object (e.g., circular, square, triangle, etc.) and the working conditions (decontamination time, And the set value is input as an input parameter of the decontamination program provided in the control unit 50. The decontamination program is set to the transfer operation of the transfer unit 10 and / The decontamination program is connected to the stored database by setting an appropriate operation for the shape and size of the decontamination object in advance.

At this time, the size and shape of the decontamination object 1 can be measured automatically by analyzing the image acquired by the image camera 15 installed on the upper part of the cleaning chamber 10, or can be performed by the operator directly selecting and inputting have.

After inputting (setting) the shape and size of the decontamination object by the above process, the operator enters the operation start button to proceed decontamination operation to decontaminate the decontamination object 1, The operation of the decanter is stopped after aligning the transfer unit 20 and the index table 13 at the initial position (origin), and the operation of the decanter is stopped by using an alarm means including a beep sound, a voice and / And the worker finishes the work by taking the decontamination object 1 out of the inside of the cleaning chamber 10.

As described above, according to the present invention, the position of a decontamination object such as radioactive waste generated during operation of a nuclear power plant is precisely controlled in three axial directions while rotating the index table in a state of being placed on an index table provided in a cleaning chamber By spraying the ultra-high-pressure water through the injection nozzle, effective decontamination can be achieved.

1: decontamination object 10: cleaning chamber
11: opening 12: shielding member
12A: first blocking film 12B: second blocking film
13: Index table 14: Jig
14A: Vertical rail 14B: Fixed arm
15: camera 20: transfer unit
21: first feed rail 21A: first screw shaft
21B: drive motor 22: second feed rail
22A: second screw shaft 22A: drive motor
23: Third feed rail 23A: Third screw shaft
23B: drive motor 24: fixed clamp
30: injection unit 31: piping
32: injection nozzle 40: ultra high-pressure water supply unit
41: flow path 42: pump
43: water tank 50: control unit
D: Door R: Rail

Claims (6)

A cleaning chamber (10) made of a closed structure and having a decontamination object (1) installed therein;
A first conveyance rail 21 installed on the outside of the cleaning chamber 10 and installed in a horizontal direction and a second conveyance rail 21 installed vertically to the first conveyance rail 21 and horizontally disposed along the first conveyance rail 21, A third conveyance rail 23 horizontally installed on the second conveyance rail 22 and vertically moved along the second conveyance rail 22 and a third conveyance rail 23 vertically moved along the second conveyance rail 22, A conveying unit (20) including a fixed clamp (24) coupled to the conveying rail (23) and moved along the third conveying rail (23);
An injection unit (30) having one end fixed to the fixing clamp (24) of the transfer unit (20) and the other end inserted into the cleaning chamber (10);
An ultra-high-pressure water supply unit 40 including a flow path 41 connected to the spray unit 30 to supply washing water and sprayed, and a pump 42 for supplying wash water through the flow path 41 with ultra-high pressure;
And a control unit (50) for controlling the transfer unit (20) and the ultra high-pressure water supply unit (40)
An opening 11 through which the other end of the injection unit 30 is inserted is provided at one side of the cleaning chamber 10 and the injection unit 30 can be shielded even if the injection unit 30 moves to the outer circumferential surface of the opening 11. [ The shielding member 12 is closely installed,
The shielding member 12 includes a pair of first blocking films 12A that are provided at one end to be in contact with each other and are folded in the horizontal direction; And a pair of second blocking films 12B which are overlapped with the first blocking film 12A and are folded in the vertical direction,
The injection unit 30 is installed into the washing chamber 10 through a space formed between the pair of first blocking films 12A and the pair of second blocking films 12B High pressure water.
The method according to claim 1,
Characterized in that an index table (13) in which the decontamination object (1) is seated and rotated 360 degrees under the control of the control unit (50) is provided in the washing chamber (10) Waste decontamination equipment.
The method of claim 2,
Characterized in that a jig (14) for fixing the decontamination object (1) is provided on one side of the index table (13).
The method according to claim 1,
Wherein the pump (42) pressurizes the washing water to 40,000 psig or more and supplies the pressurized water to the decontamination apparatus.
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