JPS623680A - Device for inspecting surface pollution of radioactive waste solidified drum - Google Patents

Abstract

PURPOSE:To narrow the installation space by providing a wiping pad driving part on a drum which is turned over and is rotated. CONSTITUTION:A drum surface pollution inspecting device 7 consists essentially of a wiping pad driving part 8 provided freely movably along all of the surface of a drum 1 turned over and rotated by a carriage 2. The driving part 8 consists of a side face wiping and driving part which wipes the side face of the drum 1 and top and bottom face wiping pad driving parts which drive top and bottom face wiping pad parts 34 and 36 which wipe the top face and the bottom face of the drum 1 respectively. It is detected whether wiping pads after wiping work are polluted or not be detectors. Thus, the device 7 has the driving part 8 provided on the drum 1 to narrow the installation space.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The invention relates to a radioactive waste solidification drum in which the surface contamination density is inspected by the smear method over the entire surface of the top, side, and bottom surfaces of a radioactive waste solidification drum. This invention relates to a solidification drum surface contamination inspection device.

[Prior art and its problems]

Radiation generated at nuclear power plants, etc. 1! ): Vehicles are separated into solids and liquids, the solids are incinerated and compressed, and the liquids are concentrated and stored in drums and solidified with cement or asphalt.

In order to reduce the effects of radiation exposure on workers during storage or during transportation of drums after storage, facilities are designed to prevent the surfaces of drums from being contaminated during storage.

However, when these drums are transported outside the controlled area to the solid waste storage facility or outside the business site for final disposal,
It is necessary to inspect drums for surface contamination. Conventionally known techniques for testing this surface contamination (for example, Japanese Patent Laid-Open No. 57-34
Figure 8 shows a schematic plan view of the wiping type radioactive clothing surface contamination testing device (see No. 475). 1 is a radioactive waste solidification drum (hereinafter simply referred to as a drum), 2 is a transport vehicle, and 3 is a wiping type bat sliding part. This wiping type pad drive unit 3 is equipped with wiping Shivarado attachment parts 4.4A and 4B for the side, top and bottom surfaces, and these wiping Shivarado attachment parts 4, 4A and 4B are equipped with wiping Shivarado attachment parts 4, 4A and 4B, respectively. υ Bad 5
It is set at ℃.

In such a wiping-type radiation injection surface contamination inspection device (smear device), a drum 1 transported by a carrier 2 on a track 6 is overturned and rotated on the carrier 2, and the side surface,
The wiping pads 5 of the top and bottom wiping pad attachment parts 4.4A and 4B are moved by the wiping pad drive unit 3 to contact the side, top and bottom surfaces of the drum 1 and move on the surface. Perform wiping work. After this wiping operation, a radioactivity detector (not shown) detects the radioactivity of the contaminant adsorbed on the wiping pad 5. However, in this smear 6fcfW, the wiping force type band drive unit 30 is located outside the installation space of the transport vehicle 2 because the wiping force type pad drive unit 3 is arranged on the side surface of the transport vehicle 20.
Since a large installation space is required, it was necessary to reduce the installation space (this was an important issue in terms of equipment).

[Purpose of the invention]

In view of the above-mentioned points, it is an object of the present invention to provide a radioactive waste solidification drum surface contamination inspection device that effectively solves the problems of the prior art and reduces the installation space.

[Key points of the invention]

In order to achieve such an object, the present invention provides a transport vehicle having an overturning table on which a radioactive waste assimilation drum is placed so as to be able to be overturned, and a drive mechanism that rotatably drives the overturned drum. and a wiping type pad drive unit that is movably provided on the entire surface of the drum, and the wiping type pad drive unit is mounted on the top of the drum. It is characterized by placement.

[Embodiments of the invention]

Next, one embodiment of the present invention will be described in detail based on one direction.

FIG. 1 is a schematic explanatory diagram of an example of a practical journey of the present invention, and FIG.
FIG. 3 is an explanatory diagram of the operation of the wiping pad section of FIG. 2, and FIG. 4 is a schematic diagram of the transport vehicle of FIG. 1. In Figures 1 to 4, the iron cage for inspecting drum surface contamination is mainly driven by a wiping pad that is movable in degrees Celsius along the entire surface of the drum, which is overturned and rotated by the conveyor table x2. It consists of 8 parts. As shown in FIG. 4, this transport vehicle 2 includes a traveling platform IIO that runs on wheels 9 on a track 6 and carries nine people, and a rotating platform 11 and a rotary vehicle 11 that are provided on the traveling platform JEIO so as to be rotatable in the left and right directions. By the operation of the mechanical power cylinder 12, the roller 9'd'a 13 is pivotally supported and has an L-shaped bottom so that it can fall freely in an upright state and in a sideways state.
It consists of When the tipping table 13 is tipped sideways, the drum can 1
This makes it easier to receive the drum 1 and send it out after wiping off the contaminants, as shown by the chain line in the upright position. The rotating roller 14 is driven by a drive motor 17,
Rotation of the drum IK in a sideways state is applied via the sprockets 18, 19, the chain 20, and the rotating shaft 21. In addition, in the drum support, the rollers 15 support the rotating drum ff1rl, and the arm 16 is used to prevent the drum l from falling. Meanwhile, the wheel 9 is driven by the drive motor 22 through the sprockets 23 and 24 and the chain 25.
The rotating cart 11 is driven fL by the drive motor 22,
It is driven via a torque limiter 26, a reduction gear 27, and a gear 28.

Next, as shown in FIG.
The frame body 29.29A is provided with a device for wiping off contaminants adhering to the surface of the drum 1 (a wiping pad drive unit 8 and a wiping pad drive unit 8 movably provided along the entire surface of the drum 1). A detector 30 for detecting the radioactivity of pollutants is installed.
a side wiping type pad drive section 31 that drives a side wiping pad section 32 that performs wiping work on the side surfaces of the drum can; It is composed of top and bottom wipeable pad drive units 33 and 35 that respectively drive wipeable pad units 34 and 36 (see FIG. 1). By the way, the 11+1 wiping pad drive unit 31 is composed of a front-rear drive mechanism 37 and a vertical drive mechanism 38, as shown in FIG. The longitudinal drive mechanism 37 includes a support plate 39°3 fixed on the frame body 29.
The same ( It consists of a front and rear simultaneous 9 screw 43 that is screwed into a female screw portion 42 fixed on the back surface. The vertical drive mechanism 38 also has four guide bars 48 that penetrate the upper plate 41A (FIG. 2) and the lower plate 41B of the movable plate 41 and are slidably disposed in the vertical direction. And, the lower plate 41BK is provided 11
．． One vertical self-feeding screw 5 screwed into the female threaded portion 49
It consists of a drive motor 51 that rotates the 0 and female threaded portion 49 to move the vertical feed screw 50 up and down, a coupling 52, 52 gear boxes, pulleys 53 and 54, a pulley belt 55, and the like.

Note that 46 is a side cover of the transfer plate 41. In addition, the side wiping pad section 32 has a mounting frame 52° 52A on which the lower ends of two kite bars 48 in the backward direction of πJ are fixed to the upper surface, as shown in FIG. 6 (4). The mounting frame 52 consists of a mounting frame holding plate 54 which is installed above the two people and has the lower end of the vertical feed screw 50 fixed to its surface. This mounting frame holding plate 54 has four guide bars 48 passed through its four corners, and the pad mounting frames 52, 52A
The pressure between the pad mounting frames 52 and 52A is maintained at a predetermined interval.
K is provided with arms 55 and 55A for pad attachment. In this pad attachment, the arms 55 and 55A are formed in a cross shape, one wiping pad 5 is attached to the tip of each, and the center part is rotatably supported on a rotating shaft 57, and the swing motor 56 The rotation of is transmitted through the Geneva tooth JiS8. Further, the position detecting plate 59 and the photoelectric switch 60 detect the rotational position of the wiping pad 5 positioned by the Geneva gear 58.

Next, the wipeable band drive unit 33 for the top and bottom surfaces.
35, as shown in FIG. 7, a mounting frame 62 installed on the frame body 29 and a lower plate 62A of this mounting frame 62 are inserted through the lower plate 62B, and are arranged vertically and slidably. four guide bars 64, and one vertical screw 66 screwed into a female threaded portion 65 rotatably provided on the lower plate 6211 of the mounting frame 62 and passing through the upper plate 62A. Then, the female threaded portion 65 is rapidly rotated, and the fast-forward drive motor 67 moves the vertical feed screw 66 up and down rapidly, and the female threaded portion 65 is slowly rotated to move the vertical feed screw 66 downward. It consists of a transportation 9 drive motor 73 etc. that causes the transport 9 to be slowly fed in the direction.

The rotation of the fast-forward drive motor 67 is transmitted to the internally threaded portion 65 via a clutch 68, a gear box 69, a pulley 70, 71, and a pulley belt 72. Further, the rotation of the slow feed drive motor 73 is transmitted to the female threaded portion 65 via a clutch 74, a gear box 75, pulleys 76 and 77, and a pulley belt 78. By the way, when the rotation of the fast-forward drive motor 67 is transmitted to the female threaded portion 65 due to the operation of this clutch 68, the clutch 74 is not activated and the rotation of the slow-speed drive motor 73 is transmitted to the female threaded portion 65. Not worth it. 40, during the operation of the clutch 74, during the gap in which 730 rotations of the slow speed drive motor are transmitted to the female threaded portion 65,
The clutch 68 is not operated and the rotation of the fast-forward drive motor 67 is controlled so as not to be transmitted to the female threaded portion 65.

Furthermore, as shown in FIG. 6(3) and (GK), the lower ends of four guide bars 64 and one vertical feed screw 66 are attached to the top and bottom wiping pad sections 34 and 36, respectively. Mounting frames 79 and 79A are provided to which the surface traps are fixed.The mounting frames 79 and 79AK are formed in a cross shape, and pads with wiping pads 5 attached to their ends are mounted on the arm 55; 55 through a Geneva gear 58, a position detection plate having the same function as that shown in FIG. 6(2) (not shown), a photoelectric switch, etc.

With this configuration, the drum can 1 placed on the conveyance table 11L2 is overturned at the position of the wiping type band drive unit 8 and driven to rotate. The side, top and bottom wiping type pad drive parts 31, 33.35 of this wiping type pad moving part 8 are connected to the upper and lower simultaneous screws 50.66.
wiping pads 5 of the side, top, and bottom pad portions 32, 34° 36 by driving the pads downward.
Contact the sides, top and bottom of the drum. Thereafter, the side surface wiping pad drive unit 31 moves the side surface of the rotating drum can from the front to the rear or the opposite direction from the front and back drive mechanism 3LK.C1 wiping pad 5
Wipe off surface contaminants from the sides of the drum. In addition, the wiping type pad drive unit 33.35 for the upper surface and the lower surface
Now, slowly move the rotating drum 1 (from the 089 section towards the center and the top and bottom wiping Shivarado sections 34 and 36, and remove the surface contamination from the top and bottom surfaces of the drum 1 with the wiping Shivarado 5. Wipe off the substance. After wiping off the contaminants, remove the wiping pads from each 32° and 34.
36 is each wiping type pad drive part 31.33.3
5, it rises, stops at a predetermined position, and waits. On this occasion,
The presence or absence of F contamination is detected by each detector 30 on the wiping pad 5 that has completed the wiping operation.

Accordingly, this drum case surface contamination inspection vehicle R7 has a wiping type bud drive unit 31 for its side surface, right curve ↓, M, and opening.
, 33.35 is -F near'L each transport platform Jit 2 O
The wiping pad 5 is mounted on a frame 29 disposed upward, moves along the entire surface of the overturned drum l, and performs a spontaneous wiping test for contaminants.

〔Effect of the invention〕

As explained above, according to the invention, the wiping pad drive unit is installed on the top of the drum which is overturned and rotated. This has the effect that the installation space of the undelivered cart is reduced, and the problems of the prior art are effectively solved.

[Brief explanation of the drawing]

Figure 1 is a table of examples of non-inventions. Figure 2 is the first example.
The schematic 4H diagram in the figure, Figure 3 is an explanatory diagram of the operation of the wiping type pad section in Figure 2, and Figure 4 is a schematic diagram of the transport vehicle in Figure 1.
Volume 1, Section 5, shows a schematic diagram of the drive unit for the wiping pad for side ears, and Figure (4) is its front view; The figure shows a schematic configuration diagram of the type band part, the figure (8) is a side view, the figure (8) is for the top side, the figure (the mouth is for the bottom side, and Figure 7 shows the wiping type pad drive unit for the top and bottom sides). The schematic configuration diagram is shown in Figure -1 (Al is the positive figure, the same figure (
W is its @ side view, and FIG. 8 is a schematic plan view of a conventionally known wiping type radioactive surface contamination inspection device. 2: Transport trolley, 5: Wiping Shibarado, 31: Side wiping)
Type pad drive part, 32: Side wiping Shibarad part, 33:
Wiping type band drive unit for upper side, 34: Wiping type band drive unit for upper side, 35: Wiping type band driving unit for bottom side, 36; Wiping type band drive unit for bottom side, 37: Back and forth movement @ structure, 38 Two up and down Movement mechanism, 4G. 48.64 Guide bar, 43: Front and rear self-feeding screw, 5
0,66: Vertical feed screw.

Claims (1)

[Claims] 1) A radioactive waste solidification drum is overturned and rotated along the entire surface thereof by a carrier having an overturning table on which the overturned drum is placed so as to be overturned, and a drive mechanism that rotatably drives the overturned drum. What is claimed is: 1. A radioactive waste solidification drum surface contamination inspection apparatus, comprising: a wiping pad drive section that is movably provided; and the wiping pad drive section is mounted on the upper part of the drum.