KR101638003B1

KR101638003B1 - Decontamination equipment for remove contaminating radioactive substance of nuclear reactor pipe

Info

Publication number: KR101638003B1
Application number: KR1020150049267A
Authority: KR
Inventors: 공창식; 김해웅; 이상철
Original assignee: 두산중공업 주식회사
Priority date: 2015-04-07
Filing date: 2015-04-07
Publication date: 2016-07-11

Abstract

The present invention relates to a decontamination apparatus for removing radioactive contaminants on the inner surface of a nuclear reactor pipeline, and more particularly, to a decontamination facility and a controllable injection angle in a closed space to protect an operator from radioactive contaminants. There is an advantage that the decontamination operation can be carried out while maintaining the angle of spray perpendicular to the inner surface of the pipe, which is the object of decontamination, through the tilting of the nozzle, thereby shortening the decontamination operation time. Which is safer, quicker, more economical and more environmentally friendly than the prior art.
The decontamination apparatus includes a circular head assembly installed at an end of the reactor piping and serving as a seal of the piping end so that contaminants and injected material of the nozzle do not flow out to the outside while the contaminants on the inner surface of the piping are removed, Means a decontamination apparatus having means for controlling the angle of the whole and including one nozzle perpendicular to the inner surface of the pipe.

Description

TECHNICAL FIELD [0001] The present invention relates to a decontamination apparatus for removing radioactive contaminants from the inside of a nuclear reactor pipeline,

The present invention relates to a decontamination apparatus for removing radioactive contaminants on the inner surface of a reactor pipeline, and more particularly, to a decontamination apparatus for removing radioactive contaminants from a reactor pipeline, To a pollutant decontamination apparatus.

Pressurized light water reactors (NPSs) commonly used in nuclear power plants operate on the principle of moving the heat energy generated by the reactor to the coolant, thereby evaporating the water and operating the turbine.

Here, the coolant, which is a means of moving the heat energy generated by the reactor, may exhibit radioactivity, and pipes and pipes through which the coolant is moved are also exposed to radioactive materials.

Therefore, it can be said that there is a considerable risk in the operation of replacing the steam generator of the reactor generator or in the decompressing of the inner surface of the pipe in the decompression business.

In the conventional decontamination method, a separate decontamination tank is manufactured, and a method of decontaminating piping communicating with the coolant in the decontamination tank is applied.

This decontamination method is a method of decontaminating the entire piping in a process requiring only decontamination of the inside of the piping, so that an excessive amount of the decontamination material is introduced and a considerable amount of pollutant discharged therefrom is discharged It was a problem.

In addition, when using the conventional art as described above, since the decontamination method is performed by chemical treatment, the time required for completely dissolving the oxides on the inner wall of the pipe is considerably consumed and the cost of various decontamination materials required for the operation is considerable .

Therefore, in order to protect the workers from the radioactive contaminants, there is a need for a decontamination apparatus for a nuclear reactor having a decontamination facility and an automated driving apparatus provided in a closed space, and a decontamination method, There is a need for a method capable of decontaminating the oxide inside the pipe through a physical method.

Korea Patent No. 2014-0056947

It is an object of the present invention to provide a decontamination facility provided in a closed space and a nozzle capable of controlling the spray angle so as to protect an operator from radioactive contaminants. The present invention also provides a reactor piping decontamination apparatus provided with an automated driving device.

According to an aspect of the present invention, there is provided a decontamination apparatus for removing radioactive contaminants from an inner surface of a reactor pipe by injecting a decontamination medium by inserting a nozzle into an inner surface of the reactor pipeline, And a blasting assembly having a head assembly fixed to the nozzle assembly and inserted into the inner tube through the nozzle assembly and angle controlling means provided on the head assembly for supporting the nozzle and controlling an injection angle of the nozzle .

Preferably, the blasting assembly is disposed at a center of the head assembly and is installed in a direction perpendicular to the head assembly.

The blowing assembly provided at the center of the head assembly and positioned in the vertical direction as described above can provide a mechanical structure capable of deeply inserting the nozzle into the inner surface of the pipe during the oxide removing operation on the inner surface of the pipe, Enabling tilting for adjustment.

Further, the blasting assembly may further include a vertically driving means for adjusting a length of the nozzle inserted into the reactor pipe.

The up and down driving means is designed to be able to move a straight line and up and down through a thread of a blast assembly shaft, which will be described below.

More specifically, it is preferable that the up-and-down driving unit includes a guide rod fixed to the head assembly and extending upward, and a nozzle holding part vertically driven along the guide rod while fixing the rear end of the nozzle.

Likewise, the blasting assembly may be a decontamination device further comprising a stopper provided at a lower side of the guide rod and restricting the downward movement of the nozzle holding part.

The angle control means may include a lower support block provided on the upper surface of the head assembly and fixed to the lower end of the guide rod, and a plurality of adjustment bolts, one end of which is rotatably fixed to the head assembly, Wherein the lower support block includes an angle adjustment hole provided with a thread corresponding to the thread of the adjustment bolt and adjusts an angle of the lower support block according to a difference in degree of rotation of each of the plurality of adjustment bolts It is possible.

It is preferable that the lower support block includes a tilting gauge indicating an amount of angular change on one side.

In addition, the decontamination apparatus is capable of being automatically driven by remote control.

Generally, since the risk of exposure to radiation is extremely low even if the operator is located outside the head assembly, it is possible to manually control the tilting angle by operating the adjusting bolt, and to automatically control the tilting angle by remote control.

The blasting assembly may further include a motor installed on an upper end plane of the blasting assembly for providing power to advance the shaft so that the nozzle can be inserted into the cylindrical reactor pipe, And at least one sensor capable of confirming the number of revolutions of the shaft and the length of the advance of the shaft.

Likewise, the head assembly may include a flange portion bound to the pipe end portion, a connecting portion vertically extending from the flange portion, and a cover plate covering the upper surface of the connecting portion.

The head assembly may further include at least one air inlet pipe extending through one side of the cover plate or one side of the extension of the cover plate.

In addition, the head assembly may include at least one observation window formed on one side of the cover plate and formed of a transparent member.

The head assembly may further include a camera positioned at an upper portion of the observation window and photographing the inside of the pipe through the observation window.

Thus, it is possible to observe the work process in real time through the observation window and the camera, and it is possible to efficiently decontaminate in a relatively short time.

The head assembly may further include a cleaner access port including a through hole provided on one side of the cover plate and a cover detachable from the through hole.

The medium injected from the nozzle may be a solid material in the form of a bead. After the decontamination operation is completed, a cleaning pipe of the cleaner is inserted into the inlet of the cleaner, Entrance is provided.

It is possible that the decontamination apparatus has a shape extending vertically from one side of the head assembly and includes a fixing assembly for supporting the blasting assembly in the lateral direction.

The role of the fixing assembly is to fix the vertical position of the blasting assembly. Therefore, the structure can be very simple.

The fixing assembly may include a head fixing part positioned at a lower end of the fixing assembly and fixed to a side surface of the head assembly and a fixing part hinged to one side of the upper part of the fixing assembly at one end and being vertically movable on the guide rod It is desirable to include a fixed fixation link.

The decontamination apparatus may include a clamp assembly which is engaged with a lower end of the circular head assembly to seal a coupling surface between the cut surface of the circular pipe and the head assembly and fixes the head assembly.

Such a clamp assembly requires a robust sealing capability to prevent the radioactive material from escaping to the outside where the operator is located when the head assembly is engaged.

The clamp assembly preferably includes a rubber ring positioned between the flange portion and the cut surface of the pipe and sealing the mating surface between the pipe and the flange.

The clamp assembly preferably includes two semicircular head retaining rings that can be separated from each other and includes a retaining ring clamp for coupling and disengaging each of the head retaining rings.

The position adjustment knob is a device for aligning the concentric shafts of the clamp assembly and the head assembly, and is driven independently of each other.

The clamp assembly is fixed by a hinge and a fixing ring clamp, but it is possible to include two semicircular locking rings that can be separated from each other.

The clamp assembly includes the two semicircular retaining rings, a hinge that fixes the ends of the two retaining rings to each other, and a retaining ring clamp that is located opposite the hinge and fixes both retaining ring ends to each other desirable.

The decontamination apparatus for removing radioactive contaminants on the inner surface of the reactor piping according to the present invention as described above includes a decontamination facility provided in a closed space and a single nozzle capable of controlling the spray angle so as to protect an operator from radioactive contaminants. There is an advantage that the decontamination operation can be performed while maintaining the angle of spray perpendicular to the inner surface of the pipe which is the decontamination object through the tilting of the nozzle and the decontamination operation time can be shortened, It has the effect of being able to decontaminate interior piping of nuclear reactor more safely, quickly, economically and environmentally friendly.

1 is a perspective view of a decontamination apparatus coupled to a reactor pipeline having an elbow section showing one embodiment of the present invention.
2 is a perspective view of a decontamination apparatus showing an embodiment of the present invention.
3 is a perspective view of a head assembly illustrating one embodiment of the present invention.
4 is a front view of a blasting assembly illustrating one embodiment of the present invention.
5 is an enlarged view of a blasting assembly illustrating one embodiment of the present invention.
6 is an enlarged view of a blasting assembly illustrating one embodiment of the present invention.
7 is a perspective view of a fixing assembly showing one embodiment of the present invention.
8 is a perspective view of a clamp assembly illustrating one embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected,""coupled," or "connected. &Quot;

FIG. 1 shows a configuration in which a decontamination apparatus for removing radioactive contaminants on the inner surface of a reactor pipeline according to the present invention is connected to a reactor pipeline having an elbow section.

If the prior art decontaminates the entire piping of a nuclear reactor as a chemical treatment inside the decontamination tank, the present invention, as shown in FIG. 1, tightly seals with the inlet (end) of the pipe, Protect workers from pollutants safely.

In addition, it is possible to eliminate the waste of the prior art which inevitably requires decontamination to the outer surface of the pipe, and to decontaminate the inner surface of the pipe only in a relatively short time using a physical method.

Figure 2 shows a detailed combination of the configurations of the present invention.

Specifically, at the bottom of the present invention, a clamp assembly 4 for sealing the mating surfaces of the reactor piping and the head assembly 1 is located, and a head assembly (not shown) 1).

The blasting assembly 2 is vertically disposed at the center of the circular head assembly 1 and is movable up and down into the piping of the nuclear reactor to enable movement of the nozzle. And supports the guide rod 21, the shaft 23 and the like, which will be described later. In addition, the fixing assembly 3 is connected to one side of the side of the blasting assembly 2 to support the blasting assembly 2 from the side so as to maintain the blasting assembly 2 vertically and to operate without deformation .

3 to 8, a detailed description will now be given of each of the structures of the head assembly 1, the blasting assembly 2, the fixing assembly 3 and the clamp assembly 4 described above.

3 is a perspective view of a head assembly illustrating one embodiment of the present invention.

First, referring to FIG. 3, a specific configuration of the head assembly 1 is shown.

The circular head assembly 1 directly engages with the cross section of the pipe and includes a flange portion 10a serving as a sealing portion, a connecting portion 10b extending upward from the flange portion 10a, There is a lid cover plate 10c.

At least one air inlet and outlet pipe 11 may be provided in the connecting portion 10b and the cover plate 10c.

The air inlet / outlet pipe (11) is provided with an air outlet pipe (11) for circulating the inside air and the contaminants removed by the vacuum equipment on the inner surface of the pipe during the operation of removing the radioactive contaminants on the inner surface of the cylindrical reactor pipe, And serves as a space for allowing it to flow into the inside.

The carrying handle 12 or 43 required to move the head assembly 1 so as to be able to engage the piping and the clamp assembly 4 is provided on one side of the upper surface of the cover plate 10c of the circular head assembly 1, Or more.

A plurality of clamps 13 are fixed to the edge of the flange portion 10a of the circular head assembly 1 in a circumferential direction May be provided at intervals.

A lamp 14 and an observation window 15 which can observe the inside of the decontamination operation are provided on one side of the upper surface of the cover plate 10c of the head assembly 1 May be provided.

In addition, the camera 16, which can photograph and control the illumination and the perspective remotely without using the human force, can be formed on one side of the upper surface of the cover plate 10c of the circular head assembly 1, Observation of internal work points is possible.

Finally, when the radioactive material decontamination work on the inner surface of the pipe is completed, a cleaner is introduced to help collect the used medium and the removed pollutants. Therefore, the cleaner inlet 17b may be provided on one side of the upper surface of the cover plate 10c of the circular head assembly 1 so that the injection unit of the vacuum cleaner can enter the piping from a remote place.

The cleaner inlet 17b may include a through hole provided at one side of the upper surface of the cover plate 10c. The through hole may be provided with a cover 17a which can be detachably attached to the end of the through hole. Preferably, the cleaner inlet 17b includes the cover 17a.

Therefore, since the detachable cover 17a is provided, the outflow of the radioactive contaminant can be prevented in advance.

Figure 4 is a front view of a blasting assembly illustrating one embodiment of the present invention, Figure 5 is an enlarged view of a blasting assembly illustrating one embodiment of the present invention, Figure 6 is an enlarged view of an embodiment of the blasting assembly .

4 to 6, there is shown a blasting assembly 2 that can be installed vertically in the center of the head assembly 1. In this embodiment,

The most important role of the blasting assembly 2 is to move the nozzle to perform the decontamination operation on the inner surface of the pipe to the inner surface of the pipe.

Therefore, a nozzle 20 bent in a right angle is provided on the rightmost side of FIG. 4, and a shaft 23 extended to the rear of the nozzle can be identified.

The nozzle 20 can be inserted into the pipe by the linear drive of the shaft 23 in the driving step and the solid medium in the form of a small bead is sprayed at the end of the nozzle 20 to remove contaminants on the inner surface of the pipe Can be removed.

Up and down driving means B for driving the nozzle up and down together with the shaft 23 are provided and can be driven up and down through a portion machined on the lower surface of the shaft 23 at all times.

A stopper 22 which is engaged with the fixing assembly 3 and fixed to the blasting assembly 2 is provided on one side of the guide rod 21 to prevent the linear movement of the shaft 23 Limits were set.

In addition, the up-down driving means B may include a guide rod 21 and a nozzle holding portion 29. The up-and-down driving means B can vertically drive the entire nozzle 20 by using a driving motor (not shown) and a shaft 23 located in the nozzle holding portion.

In addition, the lower blades of the blasting assembly 2 are provided with adjusting bolts 24 and tilting gauges 25 so that the angle of the entire nozzle 20 can be set automatically or manually, And the decontamination operation can be carried out. Through this tilting process, the decontamination operation on the inner surface of the pipe including the elbow section can be performed more efficiently and quickly than in the prior art.

It is preferable that the angle control means A is provided with the configuration of the adjusting bolt 24, the tilting gauge 25 and the lower supporting block 28.

The lower supporting block 28 includes an angle adjusting hole 30 having a thread corresponding to the thread of the adjusting bolt 24 so that the angle can be controlled by driving the adjusting bolt 24. [

More specifically, the adjusting bolt 24 is manually or automatically rotated to adjust the angle of the nozzle 20, and the angle of the lower ground block 28 is controlled by driving the adjusting bolt 24, Can be positioned so as to be perpendicular to the inner surface of the pipe, and the above-mentioned adjusted angle can be visually confirmed by the tilting gauge 25.

Through this angle control means (A), the nozzle is located in the vertical direction with respect to the inner surface of the pipe, so that effective decontamination operation is possible.

Further, there is a feature that the angle control through the angle control means A can perform an automatic or manual operation.

In addition, the upper portion of the blasting assembly 2 is provided with a motor 26 for transmitting a force capable of driving the nozzle to spray the solid medium, and the driving amount limitation of the nozzle 20 and the shaft 23 And at least one measurement sensor 27 for measuring the number of revolutions.

At least one or more measurement sensors 27 are manufactured in a small size so that a plurality of the measurement sensors 27 are disposed at the top of the nozzle 20 and at least one on the top of the shaft 23, thereby enabling more accurate and quick measurement and control.

A lower support block 28, which includes the shaft 23, the adjustment bolt 24, the tilting gauge 25 and the plurality of angle adjustment holes 30, .

The lower support block generally has a rectangular shape, but is not limited to a rectangular shape.

7 is a perspective view of a fixing assembly showing one embodiment of the present invention.

7, a perspective view of the linear type fixing assembly 3 is shown.

The fixing assembly 3 having such a linear shape is connected to one side of the blasting assembly 2 and the fixing link 33 on the upper side of the fixing assembly 3 and the connecting portion 10b of the head assembly 1, And the head fixing part 32 of the fixing assembly 3 so as to firmly fasten the blasting assembly 2 vertically positioned at the upper end of the head assembly 1 to secure the stability and the driving of the blasting assembly 2. [ There is an effect that accuracy can be enhanced.

8 is a perspective view of a clamp assembly illustrating one embodiment of the present invention.

8 shows the position of the flange 10a of the head assembly 1 and the end of the reactor piping 10a in the connection between the flange 10a and the end of the reactor piping, There is shown a clamp assembly 4 that seals to prevent leakage.

The clamp assembly 4 is provided with a ring ring 41 in the form of a round donut for the efficient performance of the sealing function mentioned above and is fastened to the rubber ring 41 to form the reactor piping and the head assembly 1 And a head fixing ring 42 for supporting a firm fastening of the head.

The head fixing ring 42 is fixed by a hinge and a fixing ring clamp 43 and may have two semicircular shapes that can be separated from each other when the hinge and the fixing ring clamp 43 are removed.

The head fixing ring 42 is fixed by the hinge and the fixing ring clamp 43. If the clamp 13 is released and the hinge is removed, the head fixing ring 42 can be separated into two.

In addition, a plurality of positioning knobs (not shown) arranged along the circumferential direction on the outer surface of the clamp assembly 4 may be used to align the clamp assembly 4 with the reactor pipeline.

In addition, a plurality of transport handles (not shown) arranged along the circumferential direction on the outer surface of the clamp assembly 4 can be utilized to easily carry and store the clamp assembly 4.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. Furthermore, the terms "comprises", "comprising", or "having" described above mean that a component can be implanted unless otherwise specifically stated, But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

1: Head assembly
2: Blasting assembly
3: Fixing assembly
4: Clamp assembly
10a: flange portion
10b:
10c: cover plate
11: Air inlet pipe
12: Carrying handle
13: Clamp
14: Lamp
15: Observation window
16: Camera
17a: cover
17b: Entrance to the cleaner
18: Blasting assembly fixed position
20: Nozzle
21: Guide rod
22: Stopper
23: Shaft
24: Adjusting bolt
25: Tilting gauge
26: Motor
27: Measuring sensor
28: Lower support block
29: nozzle holding portion
30: Angle adjustment hole
31: Main housing
32: head fixing portion
33: Fixing link
34: Moving rod
41: Rubber ring
42: head fixing ring
43: Fixing ring clamp
A: Angle control means
B: Up and down driving means
P: Piping

Claims

A decontamination apparatus for removing radioactive contaminants on the inner surface of a nuclear reactor pipeline by injecting a decontamination medium by inserting a nozzle into an inner surface of the reactor pipeline,
A head assembly (1) fixed to the end of the reactor piping and inserted through the nozzle (20) and inside the inner tube; And
And a blasting assembly (2) provided on the head assembly (1) and having an angle control means (A) for supporting the nozzle (20) and controlling an injection angle of the nozzle (20)
The blasting assembly (2) is provided at the center of the head assembly (1) and is positioned in a direction perpendicular to the head assembly (1)
The blasting assembly (2) includes an up-down driving means (B) for adjusting the length of the nozzle (20) inserted into the reactor pipe,
The upper and lower drive means B includes a guide rod 21 fixed to the head assembly 1 and extending upwardly and a guide rod 21 which is vertically driven along the guide rod 21 in a state where the rear end of the nozzle 20 is fixed And a nozzle holding portion (29)
The blasting assembly 2 includes a stopper 22 provided at a lower side of the guide rod 21 and restricting the downward movement of the nozzle holding portion 29,
The head assembly 1 includes a flange portion 10a coupled to the pipe end portion, a connecting portion 10b extending vertically from the flange portion 10a, and a cover plate 10c covering the upper surface of the connecting portion 10b Including,
And a clamp assembly (4) for fixing the flange portion (10a) and the pipe end portion, wherein the clamp assembly (4) is located between the flange portion (10a) and the cut surface of the pipe, The rubber ring 41 sealing the engagement surface between the flange portions 10a and the clamp assembly 4 are formed of two semicircular head retaining rings 42 that can be separated from each other, 42), each of the clamping ring clamps (43)
The angle control means A includes a lower support block 28 provided on the upper surface of the head assembly 1 and having a lower end fixed to the guide rod 21, The lower support block 28 includes a threaded angle adjustment hole 30 that corresponds to the thread of the adjustment bolt 24, and includes a plurality of adjustment bolts 24, And an angle of the lower support block (28) is adjustable according to a difference in degree of rotation of the plurality of adjustment bolts (24).

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The method according to claim 1,
The lower support block (28) includes a tilting gauge (25) indicating an amount of angular change on one side.

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The method according to claim 1,
The head assembly (1) further comprises at least one air inlet pipe (11) extending through one side of the cover plate (10c) or one side of the extension (10b) and extending outward.

The method according to claim 1,
Wherein the head assembly (1) comprises at least one observation window (15) formed at one side of the cover plate (10c) and formed of a transparent member.

11. The method of claim 10,
Wherein the head assembly (1) further comprises a camera (16) positioned above the observation window (15) and photographing the interior of the piping through the observation window (15).

The method according to claim 1,
The head assembly (1) includes a cleaner inlet (17b) including a through hole provided at one side of the cover plate (10c) and a cover (17a) detachable from the through hole.

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The method according to claim 1,
(3) having a shape extending vertically from one side of the head assembly (1) and supporting the blasting assembly (2) in a lateral direction.

17. The method of claim 16,
The fixing assembly 3 includes a head fixing part 32 positioned at a lower end of the fixing assembly 3 and fixed to a side surface of the head assembly 1; And
A fixing link 33 having one end hinged to one side of the fixing assembly 3 and the other end fixed on the guide rod 21 so as to be movable up and down;
.