KR102064772B1 - Plate type Metal Radioactive Waste Surface-Decontaminated Equipment - Google Patents

Abstract

The present invention relates to a surface-decontaminating apparatus of planar radioactive metal waste, which removes contaminated radioactive substances and foreign substances on a surface of planar radioactive metal waste generated in a planar nuclear facility with a mechanical method, protects workers from scattering of foreign substance generated according to decontamination, and allows easy operation and maintenance, including: an enclosure (10) which has an exhaust hood (13) on an upper part and forms opening portions on each front side and back side to inject and exhaust planar radioactive metal waste (100); a pair of iron brush rollers (30) which is vertically installed inside the enclosure (10) to grind an upper surface and a lower surface of the planar radioactive metal waste (100), respectively, to remove surface contaminants; a transfer part (40) which includes movable urethane rollers (40a, 40b) vertically disposed on one or both sides of front or back sides of the iron brush rollers (30) to transfer the planar radioactive metal waste (100); an iron brush driving motor (35) which includes a first motor (35a) and a second motor (35b) rotationally driving the iron brush rollers (30); a third motor (45) which rotationally drives the movable urethane rollers (40a, 40b) of the transfer part (40); a base (20) which supports the enclosure (10), accommodates electric facilities inside and has a door (25) installed on a front side; and a control panel which is disposed on one side of the base (20) to turn on and off power supply and control the motors (35, 45).

Description

Plate type Metal Radioactive Waste Surface-Decontaminated Equipment

The present invention relates to a surface decontamination apparatus for flat metal shields, and more particularly, to transporting metal shields in the form of flat plates generated in a nuclear power plant, and at the same time mechanically removing radioactive substances and foreign substances contaminated on the surface of the metal shields. The present invention relates to a surface decontamination apparatus for flat metal shielding, which can remove and protect workers from scattering of foreign substances generated by decontamination, and is easy to operate and maintain.

In general, when operating a nuclear power plant or dismantling a nuclear power plant, various and massive radioactive waste such as metal fragments contaminated with radioactivity, concrete, contaminated soil, etc. are generated. Most of these radioactive wastes are low level radioactive wastes or very low level radioactive wastes, which have no high radioactive level, and are recycled through in-house treatment.

In particular, radioactive waste consisting of metal such as metal fragments (hereinafter referred to as 'metal waste') can be classified into contamination with corrosion products contained in the primary coolant of the reactor and radioactive products generated by neutron irradiation during the operation of the reactor. In addition, radioactive contamination attached to the metal surface can be removed by chemical and mechanical decontamination methods.

Most of the metal wastes generated during the dismantling of nuclear power plants come from large devices such as heat exchangers, moisture separators, and steam generators, which take up a lot of disposal space at the end of disposal. Among them, carbon steel, stainless steel, and Inconel are worth recycling. so big. Most of these metal scraps are weakly contaminated with radioactive materials, so most of them can be discharged without a separate treatment procedure or can be recycled after some decontamination. In addition, many facilities such as flat metal plates formed in various sizes are generated in facilities such as nuclear power plants, and these can be recycled if only surface contaminants are removed.

On the other hand, most of the decontamination work of metal shielding is using a chemical treatment method using chemicals. Chemical treatment methods are decontamination using high and low concentrations of organic and inorganic acid chemical decontamination agents. Oxalic acid, ethylenediaminetetraacetic acid (EDTA), and picolinic acid (Picolinic acid) known to form strong complexes Organic acid complexing agents such as acid) have been used.

In other words, in the conventional chemical decontamination method, an organic acid complexing agent such as oxalic acid, formic acid, EDTA, etc. is used to dissolve the iron component present in the radioactive contaminating oxide film in the decontamination of radioactively contaminated reactor cooling pump or metallic waste. It is.

However, organic acid complexing agents have a disadvantage in that they must be decomposed or adsorbed onto an ion exchange resin in order to minimize the amount of radioactive wastes generated after decontamination, and in order to decompose the organic acid complexing agents, a separate device such as a UV irradiation apparatus is required. And, if they do not completely decompose, they also have a problem that remains as radioactive waste. In addition, even when the organic acid complexing agent is adsorbed by the ion exchange resin, there is a problem of greatly reducing the disposal stability of the radioactive waste.

Meanwhile, as a result of examining the prior art related to the present invention, a number of patent documents have been searched, and some of them are introduced as follows.

Patent document 1 includes a first conveyer installed so that at least the bottom portion of the safety shoes to be processed can be continuously transported, a first brush installed and rotated so as to interfere with the bottom of the safety shoes conveyed through the first conveyer, and 1 A pre-treatment device equipped with a cleaning liquid sprayer for spraying cleaning liquid with the safety shoes at the bottom of the safety shoes conveyed through the conveyer, and a second feeder installed so that the bottom of the safety shoes to which the cleaning liquid is absorbed and transported can be continuously transported. A cold water sprayer installed to spray cold water to the safety shoes transported through the second conveyer, and a post-treatment device having at least one second brush installed to rotate in contact with the safety shoes, and radiation penetrated into the safety shoes. Particles can be effectively discharged, increasing the decontamination cleaning efficiency of safety shoes, increasing recycling and cleaning time Discloses a radiation protection system for a safety shoe decontamination process can be shortened.

Patent document 2 includes a decontamination housing, a decontamination supply means, a protective housing, an auxiliary decontamination means, a controller and a moving means, and automates all decontamination treatment procedures of metal radioactive waste using steam, water, and air to treat radiation. Disclosed is a radioactive waste decontamination method using a radioactive waste decontamination system that can increase efficiency, prevent workers' radiation exposure, and reduce secondary waste.

Patent document 3, an upper stage; A lower stage provided below the upper stage; A plate-shaped radioactive waste treatment space formed between the upper stage and the lower stage; A first roller unit for introducing the plate-shaped radioactive waste into the radioactive waste processing space; A second roller unit for discharging the plate-shaped radioactive waste introduced into the processing space to the outside; And a third roller portion provided between the first roller portion and the second roller portion to move the plate-type radioactive waste. The plate-shaped radioactive waste composite decontamination apparatus is disclosed.

KR 10-2006-0061217 A KR 10-1527773 B1 KR 10-1643539 B1

The present invention has been made in order to solve the above problems of the prior art, by mechanically polishing the surface of the metal shielding is not radioactive pollution by removing the radioactive contamination portion to enable the recycling of the metal constituting the metal shielding. In particular, the surface decontamination device of the flat metal shielding material to remove the radioactive substances and foreign substances remaining on the surface of the metal shielding by mechanically polishing the upper and lower surfaces of the metal shielding, while automatically transporting the flat metal shieldings. The purpose is to provide.

Surface decontamination apparatus of the flat metal shield of the present invention for achieving the above object, the exhaust hood is provided at the top and the housing is formed in each of the opening and the front and rear so as to feed and discharge the flat metal shield; A pair of iron brush rollers installed up and down inside the enclosure so as to remove surface contamination by grinding the upper and lower surfaces of the flat metal shield; Shear-moving urethane rollers disposed up and down in front of the iron brush rollers to guide flat metal shields to the iron brush rollers, and the rear of the iron brush rollers to discharge flat metal shields passed through the iron brush rollers. A transfer part made of a rear end movable urethane roller disposed up and down; An iron brush driving unit including a first motor and a second motor to rotationally drive the iron brush roller; A third motor which rotationally drives the shearing type urethane roller and the rearward type urethane roller of the conveying part; A base supporting the enclosure and having an electrical facility housed therein and a door installed at the front thereof; And a control panel provided at one side of the base to turn the power supply on and off and control the motors.

In addition, according to the surface decontamination apparatus of the flat metal shield of the present invention, the upper iron brush roller is installed to be able to move up and down to adjust the interval between the iron brush roller, the upper iron brush roller is rotatably installed The roller fixing plate is supported by four roller fixing bolts installed to be movable up and down on the installation frame, and is moved up and down by a height adjustment bolt provided on the upper side of the installation frame.

Further, according to the surface decontamination apparatus of the flat metal shield of the present invention, the roller shaft of the iron brush roller is rotatably installed on the roller frame detachably attached to the installation frame, the pulley rotated by the first motor is Removably coupled to the roller shaft.

In addition, according to the surface decontamination apparatus of the flat metal shield of the present invention, the shearing type urethane roller and the rear end type urethane roller have a roller frame in which a roller shaft is rotatably installed and detachably installed on the mounting frame. Urethane rollers located on the upper side of the roller is characterized in that the elastic support by the spring.

In addition, according to the surface decontamination apparatus of the flat metal shield of the present invention, the supply guide for guiding the flat metal shield with an iron brush roller inside the enclosure and the discharge guide for guiding the decontaminated flat metal shield to the outside of the enclosure Is installed, characterized in that the movement wheel is provided in the lower portion of the base.

In the surface decontamination apparatus of the flat metal shield of the present invention, a pair of iron brush rollers are formed on the top and bottom surfaces of the flat metal shield in the process of transferring the flat metal shield into the enclosure in the forward and backward direction of the enclosure. Simultaneous polishing removes radioactive material and foreign matter, so that the surface decontamination work of the plate-type metal shielding is semi-automated to reduce the manpower loss and to prevent damage caused by the scattering of the radioactive material during the decontamination work.

Further, according to the surface decontamination apparatus of the flat metal shield of the present invention, the decontamination operation is possible and the polishing depth can be freely controlled regardless of the thickness of the flat metal shield due to the adjustment of the spacing between the iron brush roller.

In addition, according to the surface decontamination apparatus of the flat metal shield of the present invention, as the iron brush roller and the movable urethane roller is detachably coupled to the installation frame, replacement is possible at the time of aging.

In addition, according to the surface decontamination apparatus of the flat metal shield of the present invention, the supply guide and the discharge guide is provided to smoothly transport the flat metal shield, and the moving wheel is provided at the bottom of the base to change the installation place easily It is possible to decontaminate the tubular metal shield while moving.

1 is a block diagram of a surface decontamination apparatus of a plate-type metal shield according to the present invention.
Figure 2 is a side view of the surface decontamination apparatus of the flat metal shield according to the present invention.
3 is a plan view showing a decontamination unit according to the present invention.
Figure 4 is a side view showing a decontamination unit according to the present invention.
Figure 5 is a block diagram showing the iron brush roller portion according to the present invention.
Figure 6 is a reference diagram showing a fixing part of the upper iron brush roller according to the present invention.
Figure 7 is a reference diagram showing a replacement state of the iron brush roller according to the present invention.
Figure 8 is a reference diagram showing a replacement state of the movable urethane roller according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described a surface decontamination apparatus of the flat metal shield of the present invention.

1 is a block diagram of a surface decontamination apparatus for a flat metal shield according to the present invention, Figure 2 is a side view of a surface decontamination apparatus for a flat metal shield according to the present invention, Figure 3 is a plan view showing a decontamination unit according to the present invention 4 is a side view showing a decontamination unit according to the present invention. 5 is a block diagram showing the iron brush roller according to the present invention, Figure 6 is a reference diagram showing the fixing portion of the upper iron brush roller according to the present invention, Figure 7 is a replacement state of the iron brush roller according to the present invention 8 is a reference diagram showing a replacement state of the movable urethane roller according to the present invention.

Surface decontamination apparatus of the plate-type metal shield according to the present invention, as shown in Figures 1 to 8, the housing 10, the base 20, a pair of iron brush roller 30, a shear-movable urethane roller ( It consists of a conveyance part 40 and a control panel which consist of 40a) and the back end movable urethane roller 40b.

The enclosure 10 is a surface decontamination operation by the iron brush roller 30, the exhaust hood 13 for the discharge of the decontaminated radioactive material or foreign matter is provided on the top and the tubular metal shield 100 is injected And openings are formed in the front and rear, respectively, so that the discharge and the installation frame 15 is provided with the iron brush roller 30 and the movable urethane rollers (40a, 40b) is installed. At this time, the supply guide 11 for guiding the flat metal shield 100 to the iron brush roller 30 and the decontamination of the flat metal shield 100, the decontamination is completed inside the housing 10 outside the housing 10 The discharge guide 12 to guide the is installed. In addition, it is preferable that a transparent shielding plate (not shown) having a hole through which the flat metal shield 100 can be inserted or discharged is installed at openings in the front and rear of the enclosure 10. Accordingly, the shielding plate is shielded from radioactive substances or foreign matters generated during the decontamination process, thereby protecting the worker safely and visually checking the progress of internal work through the transparent shielding plate. .

The base 20 is provided with a receiving portion for accommodating a work or the like required for the operation or the electric device is installed, and the door 25 is installed on the front of the receiving portion. And, the lower portion of the base 20 is provided with a moving wheel 21 for movement to change the working position as needed.

The iron brush roller 30 is to remove the surface contamination by polishing the upper and lower surfaces of the flat metal shield 100 in the forward and backward direction in the interior of the housing 10, the surface of the housing 10 It is installed up and down on the installation frame 15 provided therein. At this time, the upper iron brush roller (30a) is installed to be able to move up and down to adjust the interval between the iron brush roller 30 according to the thickness of the flat metal shield (100). That is, the roller fixing plate 38, on which the upper iron brush roller 30a is rotatably installed, is supported by four roller fixing bolts 37 mounted on the mounting frame 15 so as to be movable upward and downward. It is moved up and down by the height adjustment bolt 36 provided on the upper side.

The iron brush roller 30 is connected to the iron brush driving motor 35 by a pulley 33 to be rotated. At this time, the upper iron brush roller (30a) is rotated by the first motor (35a) provided in the housing 10, the lower iron brush roller (30b) is a second motor (installed in the receiving portion of the base 20) 35b). Therefore, although the upper iron brush roller 30a and the lower iron brush roller 30b may rotate at the same speed, they may be rotated at different speeds.

In addition, the iron brush roller 30 is installed in the installation frame to be replaced. That is, the roller shaft 31 of the iron brush roller 30 is rotatably installed on the roller frame 32 detachably attached to the mounting frame 15, the first motor (35a) or the second motor ( The pulley 33 rotated by 35b) is detachably coupled to the roller shaft 31. Accordingly, as shown in FIG. 7, in the state in which the pulley 33 is separated from the roller shaft 31 of the iron brush roller 30, the roller frame 32 is separated from the installation frame 15. The iron brush roller 30 can be replaced.

The transfer part 40 is for transferring the flat metal shield 100, and is disposed up and down in front of the iron brush roller 30 to guide the flat metal shield 100 to the iron brush roller 30. The rear end movement urethane roller 40a and the rear end movement urethane roller disposed vertically in the rear of the iron brush roller 30 so as to discharge the flat metal shield 100 passed through the iron brush roller 30 40b).

The front end urethane roller 40a and the rear end urethane roller 40b constituting the conveying part 40 are rotated by the third motor 45. Only the urethane roller at the bottom is rotated by the third motor and The urethane roller is free to rotate. In this case, the third motor 45 may be configured in a double manner to drive the front end urethane roller 40a and the rear end urethane roller 40b at different speeds.

The front end-type urethane roller 40a and the rear end-type urethane roller 40b are detachably coupled to the installation frame 15 by detachably coupling the roller frame 41 on which the roller shaft is rotatably, so that the replacement of the urethane roller 40a is possible. In addition, the urethane roller located on the upper side of the movable urethane rollers 40a and 40b is elastically supported by a spring to transfer the flat metal shield 100 regardless of the flat plate thickness.

The control panel is provided on one side of the base 20 to turn the power supply on and off and control the motors 35, 45, and is preferably installed in the door 25 of the base 20. . The control panel includes a power switch for controlling the supply of main power, a motor drive switch and a stop switch for driving and stopping the motor, a speed adjusting knob for adjusting the speed of the motor, and a power indicator for displaying the power supply. And an emergency stop switch for emergency stop, and may further include a foot switch for controlling supply of main power separately from the power switch. Here, the feed rate of the movable urethane roller can be adjusted in a total of 10 steps, the feed rate of each step is preferably 5.45m / min and the maximum feed rate is 54.5m / min of 10 steps.

Decontamination of the surface of the plate-type metal shield by using the surface decontamination apparatus of the plate-type metal shield of the present invention configured as described above is as follows.

The main power is supplied using the power switch or the foot switch of the control panel 50, and the flat metal shield 100 is put into the supply guide 11 through the hole of the shielding plate provided in front of the enclosure 10. . Thereafter, by operating the switch of the control panel to determine the transfer speed of the plate-type metal shielding object 100 by the front end-type urethane roller 40a and the rear end-type urethane roller 40b and at the same time the rotational speed of the iron brush roller 30 Decide Here, the decontamination precision varies depending on the feed speed of the metal shield 100 and the rotation speed of the iron brush roller 30. That is, if the transfer speed of the metal shield 100 is fast or the rotation speed of the iron brush roller 30 is not sufficient decontamination is not made, the transfer speed of the metal shield 100 is slow or the rotation of the iron brush roller 30 The faster the speed, the better the decontamination precision.

In addition, at this time, it is natural to adjust the interval between the iron brush roller 30 in accordance with the thickness of the flat metal shield 100, the upper urethane roller 40a and the rear urethane roller 40b in the upper urethane Since the roller is elastically supported by the spring, no separate gap adjustment is necessary. At this time, it is possible to adjust the polishing depth by adjusting the interval between the iron brush roller (30).

In this state, each of the motors 35 and 45 is operated by operating the switch of the control panel 50, and the flat metal shield 100 is transferred by the front end urethane roller 40a and the rear end urethane roller 40b. In addition, the iron brush roller 30 removes radioactive material and foreign matter remaining on the surface 100 of the flat metal shield by polishing the top and bottom surfaces of the flat metal shield 100, respectively. Then, the decontamination of the flat metal shielding 100 is discharged through the hole of the shielding plate provided on the back of the enclosure 10 along the discharge guide 12.

As described above and described with reference to some embodiments for illustrating the technical idea of the present invention, the present invention is not limited to the configuration and operation as described above, the scope of the technical idea described in the description of the invention Those skilled in the art will appreciate that many changes and modifications can be made to the invention without departing from the scope of the invention. Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

10 ... enclosure
11.Supply Guide
12.Emission Guide
13 Exhaust Hood
15.Installation frame
20 ... Bass
21.Moving Wheels
25 ... door
30.Iron Brush Roller
30a ... upper iron brush roller
30b ... lower iron brush roller
31 .... roller shaft
32 ... roller frame
33 ... Pulley
35.Iron Brush Drive Motor
35a ... 1st motor
35b ... 2nd motor
40.Transfer
40a ... Shear movable urethane roller
40b ... rear movable urethane roller
41 ... roller frame
45 ... 3rd motor
50 ... control panel
100 ... flat metal shield

Claims (5)

An enclosure 10 having an exhaust hood 13 formed at an upper portion thereof and openings formed at front and rear sides thereof to allow the flat metal shield 100 to be introduced and discharged;
A pair of iron brush rollers 30 which are installed up and down inside the enclosure 10 to polish the upper and lower surfaces of the flat metal shield 100 to remove surface contamination;
Passed through the shear-movable urethane roller (40a) and the iron brush roller 30 disposed up and down in front of the iron brush roller 30 to guide the flat metal shield 100 to the iron brush roller (30) A transfer part 40 formed of a rear end movable urethane roller 40b disposed up and down behind the iron brush roller 30 so as to discharge the flat metal shield 100;
An iron brush drive motor (35) comprising a first motor (35a) and a second motor (35b) for rotationally driving the iron brush roller (30);
A third motor 45 for rotationally driving the movable urethane rollers 40a and 40b of the transfer part 40;
A base 20 supporting the enclosure 10 and having an electrical facility housed therein and a door 25 installed at the front thereof;
And a control panel provided at one side of the base 20 to turn on and off a power supply and to control the motors 35 and 45.
The upper iron brush roller (30a) is installed to be able to move up and down so as to adjust the interval between the iron brush roller (30),
The roller fixing plate 38 on which the upper iron brush roller 30a is rotatably supported is supported by four roller fixing bolts 37 mounted on the mounting frame 15 so as to be movable up and down, and the upper side of the mounting frame 15. The surface decontamination apparatus of the flat metal shield, characterized in that it is moved up and down by the height adjustment bolt (36) provided in. delete The method of claim 1,
The roller shaft 31 of the iron brush roller 30 is rotatably installed on the roller frame 32 detachably attached to the installation frame 15,
The surface decontamination apparatus of the flat metal shield, characterized in that the pulley (33) rotated by the first motor (35a) or the second motor (35b) is detachably coupled to the roller shaft (31). The method of claim 1,
The shear movement type urethane roller 40a and the rear end type urethane roller 40b are detachably installed on the mounting frame 15 with a roller frame 41 on which a roller shaft is rotatable.
Urethane rollers located on the upper side of the movable urethane rollers (40a, 40b) is a surface decontamination apparatus of the flat metal shield, characterized in that the elastic support by the spring. The method according to any one of claims 1, 3, and 4,
The supply guide 11 for guiding the flat metal shield 100 with the iron brush roller 30 and the decontamination of the flat metal shield 100 in the interior of the housing 10 to the outside of the housing 10. Ejection guide 12 is installed,
Surface decontamination apparatus of the flat metal shield, characterized in that the movement wheel 21 is provided in the lower portion of the base (20).

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