JPH086316Y2 - Transporter for radioactive objects - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a device for transporting a radioactive object while shielding it.

“Problems to be Solved by Conventional Techniques and Inventions” When a radioactive object is transported, radiation is emitted from the radioactive object, so that the radioactive object needs to be in a shielded state. For this reason, when carrying a relatively long distance, it is considered that the radioactive object is carried in a sealed shielding container.

In this case, when carrying out the transfer work in a specific facility, it is effective to move the shielding container itself by remote control.

However, since it is necessary to form an inlet / outlet opening for a radioactive object in the shielding container, it is necessary to take care so that radiation does not leak from the inlet / outlet opening.

The present invention has been proposed in view of the above circumstances, and an object of the present invention is to provide a carrier device that can handle a radioactive object while being effectively shielded.

[Means for Solving the Problems] A transporting device for radioactive objects according to the present invention is disposed movably inside a transporting chamber, and is aligned above an opening opened vertically through the floor. A shielded container for storing the radioactive object, a shutter mechanism arranged at the inlet / outlet of the shielded container to open / close the inlet / outlet by a movable shield, and an outlet / inlet. And an auxiliary shielding mechanism for retracting the cylindrical shield surrounding the outer container from the outer surface of the shielding container, and the cylindrical shield of the auxiliary shielding mechanism is provided in the vertical direction when protruding downward from the shielding container. A ring-shaped projection for positioning the traveling position by fitting with the recess of the opening which is opened in a penetrating state is provided, and at least one of the outer peripheral surface of the ring-shaped projection and the inner peripheral surface of the recess is tapered. It is characterized in that it is formed on the surface.

[Operation] In the transfer device of the present invention, when a radioactive object is put in or taken out from the inlet / outlet of the shielding container, the tubular shield is projected by aligning the inlet / outlet with the opening of the transfer chamber. The projection is fitted in the recess around the opening. At this time, if there is a misalignment between the inlet / outlet opening and the opening, at least one of the outer peripheral surface of the ring-shaped projection and the inner peripheral surface of the recess is Since it is formed on the tapered surface,
By the aligning action by the fitting of the tapered surfaces, the inlet / outlet opening and the opening can be moved relative to each other, and the two can be accurately aligned. Then, in this alignment state, the radioactive object can be put into and taken out of the shielding container via the opening and the taking-out port, and the radioactive object can be loaded into the shielding container from the taking-out port to reach the intended place. Once transported, it can be taken out again from the loading / unloading port. Further, during this conveyance, the movable shield of the shutter mechanism closes the loading / unloading port to establish a blocking state.

[Embodiment] An embodiment of the carrier device of the present invention will be described below with reference to the drawings.

In this example, the radioactive substance 1 is an example of a solidified body of high-level radioactive waste.
Is formed in a columnar shape as a whole, and a knob portion 1a is integrally provided on the upper surface. Then, the transfer device 2 holds the radioactive object 1 vertically and transfers it from the inspection room to the storage room 3, which is the transfer destination, as shown in FIGS. 6 and 7.
The radioactive substance 1 is housed in the cylindrical pit 4 of the storage chamber 3, and a traveling rail 6A is laid inside the transport chamber 5 located above these, and the traveling rail 6A is for traversing. The rail 6B is provided so as to be able to travel by the traveling platform 7, and the transport device 2 is mounted on the traverse rail 6B so as to be capable of traveling (transverse movement). In addition, an opening 9 through which the radioactive object 1 can pass vertically is formed in the ceiling (floor of the transfer chamber 5) 8 of the inspection room and the storage room 3 (only the storage room 3 is shown in the drawing, but the inspection room has the same structure). , Which will be described below with the same reference numerals), and these openings 9 are closed by a shielding plug 10. This shield plug 10 is also transported by the transport device 2 together with the radioactive object 1, and is provided with a knob portion 10a similar to that of the radioactive object 1. As shown in FIG. 2, a cylindrical pit 4 is provided so as to cover the surface of the opening 9, and its flange 4a is exposed on the floor 8 of the transfer chamber 5.

The transport device 2 has a bottomed cylindrical tubular container 11 in which the radioactive object 1 is housed, a lid 12 for closing the top of the shielding container 11, and a swivel mechanism for swiveling the lid 12. 13
A plurality of chucks 15 suspended from the lid 12 through the lifting mechanism 14 in the shielding container 11, and a guide suspended from the lid 12 into the shielding container 11 so as to surround the chucks 15.
16, a shutter mechanism 18 for opening and closing the access port 17 of the bottom wall 11a of the shielding container 11, and an auxiliary shielding mechanism 19 for shielding between the access port 17 and the floor 8 of the transfer chamber 5. It is configured.

The shielding container 11 has a two-layer shielding structure made of steel and polyethylene, and a pedestal 21 mounted on the traverse rail 6B is integrally formed on the outer surface of the intermediate portion in the height direction thereof, Wheels 22 and drive motor (not shown) on the frame 21
A traveling mechanism 23 that can be remotely controlled is provided. In addition, the bottom wall 11a of the shielding container 11 is provided with the inlet / outlet port 1
7 is provided in a vertically penetrating state and in an eccentric state with respect to the center of the shielding container 11. It should be noted that a slight recess 24 is formed on the inner bottom surface of the shielding container 11 at a position 180 ° away from the inlet / outlet port 17, and the storage chamber 3 is formed in the recess 24.
A cap 25 for closing the opening 9 of the shield plug 10 from above is housed in a mounted state.

The lid 12 is rotatably mounted on the upper end of the shielding container 11 via a bearing 26, and is rotated by the turning mechanism 13 with the center of the shielding container 11 as the turning center. The turning mechanism 13 is configured such that a pinion 28 is driven by a drive motor 27 fixed to the outer side of the shielding container 11, and a rack 29 that meshes with the pinion 28 is formed on the lid 12. Further, a vent hole 30 is opened in a central portion of the lid body 12 in a penetrating state, and a screw plug 31 having a thread groove on the outer peripheral surface is formed in the vent hole 30.
Is fixed in a fitted state, and the ventilation channel 32 that is spirally bent is formed by the screw plug 31.

The chuck 15 includes the radioactive object 1 and the shield plug 10.
For gripping the knob portions 1a and 10a of the
For example, four pieces are suspended in the circumferential direction at intervals of 90 °, and each of them is vertically moved by a lifting mechanism 14.

Each hoisting mechanism 14 is configured such that a hoisting machine 33 is housed in the outer peripheral portion of the lid body 12, and the wire 34 connected to the chuck 15 is hoisted and unwound by the hoisting machine 33.

The guide 16 is formed in a cylindrical shape having an outer diameter slightly smaller than the inner diameter of the shielding container 11, and four loadings into which the chuck 15 and the radioactive object 1 or the shielding plug 10 suspended by the chuck 15 can be inserted. A hole 35 is formed in a penetrating state in the up-down direction (length direction), and is suspended by the bracket 36 on the lower surface of the lid body 12 in a fixed state and floating from the inner bottom surface of the shielding container 11. The guide 16 can be hung by using the bracket 36 or by extending the outer cylinder of the guide 16 from the lower surface of the lid 12. And, the same size as the radial dimension from the center of the guide 16 to the loading hole 35, the loading / unloading port 17 is provided eccentrically from the center of the shielding container 11, and the guide 16 pivots together with the lid 12 to load it. One of the holes 35 is aligned with the inlet / outlet port 17 in the vertical direction.

The shutter mechanism 18 is provided on the bottom wall 11a of the shielding container 11 and is provided on the side of the inlet / outlet port 17 to / from the inlet / outlet port 17.
A recess 37 communicating with the rail is formed, and a movable shield 38 is provided in the recess 37 so that the movable shield 38 can be pulled out to the inlet / outlet 17.
A screw shaft 40 supported by 39 and screwed into the movable shield 38.
Is rotatably supported on the inner bottom surface of the recess 37, and the screw shaft 40
A drive rod 42 is connected via a coupler 41 having a bevel gear or the like, and the drive rod 42 is connected to a drive motor 43 on the outer surface of the shielding container 11. By rotating the screw shaft 40 by the drive motor 43, the movable shield 38 is reciprocally moved along the rail 39 as shown by an arrow (a) in FIG. is there. In this case, the movable shield 38 is formed with a ventilation hole 44 along the up-down direction in a penetrating state, and the lid body is provided in the ventilation hole 44.
A screw plug 45 similar to the vent hole 30 of 12 is fitted, and when the access port 17 is blocked, the screw plug 45
The inside and outside of the shielding container 11 communicate with each other through the bent ventilation passages 45.

The auxiliary shielding mechanism 19 is such that a cylindrical shield 52 surrounding the inlet / outlet 17 is housed in a ring-shaped recess 51 formed on the lower surface of the bottom wall 11a of the shielding container 11, and a vertical direction is provided on the back of the cylindrical shield 52. The guide rod 53 provided along the bottom wall of the shielding container 11
It is movably inserted into 11a and can be moved in the vertical direction indicated by the arrow (b) in FIG. 1 by a screw shaft 54, a drive motor 55 and the like similar to the movable shield 38.

Further, on the lower surface of the cylindrical shield 52, a ring-shaped protrusion 57 that fits into a recess 56 formed around the opening 9 of the transfer chamber 5.
Is provided so as to extend the access port 17. In this case, the outer peripheral surface of the ring-shaped protrusion 57 and the inner peripheral surface of the recessed portion 56 are formed as tapered surfaces 57a and 56a at the same angle as shown in FIG. 2, and these tapered surfaces 57a and 56a are in a fitted state. At this time, the axial centers X ₁ and X _{2 of the} inlet / outlet port 17 and the opening 9 are made to coincide with each other.

In addition, between the shielding container 11 and the lid 12, or the shielding container
Each mating surface such as between the 11 and the tubular shield 52 is bent so as not to be a flat plane shape, and radiation leakage from these mating surfaces is effectively prevented.

When the radioactive object 1 is transported by the transport device 2 configured as described above, the traveling rail 6A and the traverse rail 6B are used.
After moving the transport device 2 right above the opening 9 of the examination room to roughly align the loading / unloading port 17 and the opening 9, the tubular shield 52 of the auxiliary shield mechanism 19 is lowered. Floor 8
The ring-shaped projection 57 is fitted in the upper recess 56. At this time, if there is a misalignment between the inlet / outlet opening 17 and the opening 9,
Since both the outer peripheral surface of the ring-shaped projection 57 and the inner peripheral surface of the recess 56 are formed as tapered surfaces 57a and 56a, the tapered surface 57a
Due to the centering effect of the fitting of a and 56a, the carrier device 2 can be moved horizontally and the two can be accurately centered.
And, in this aligned state, the opening 9 and the inlet / outlet port
It is said that it is surrounded by 17 in a ring shape.

Then, the loading / unloading port 17 and the loading hole 35 of the guide 16 are aligned with each other, the movable shield 38 of the shutter mechanism 18 is housed in the recess 37, and the loading / unloading port 17 is opened, as shown in FIG.
The state is shown in. Then, the chuck 15 is taken in and out 17
Shield plug 10 that descends below and closes the opening 9
After that, the wire 34 is wound up by the winding machine 33 of the lifting mechanism 14, and the shielding plug 10 is pulled up into the loading hole 35 of the guide 16 as shown in FIG. 8B.

Next, the lid 12 is swung 90 ° by the swivel mechanism 13, the shield plug 10 is retracted from above the loading / unloading port 17 and the empty loading hole 35 is loaded / unloaded as shown in FIG. 8 (c).
After positioning to 17, the chuck 15 is lowered into the inspection chamber through the loading / unloading port 17 to grip the radioactive object 1, and again pulled up to be stored in the loading hole 35 of the guide 16 as shown in FIG. 8 (d). After this operation is repeated to store the radioactive objects 1 in the remaining loading holes 35, respectively, the tubular shield 52 is pulled up, and the shutter mechanism 18 is driven to move the movable shield.
Pull out the 38 into the inlet / outlet port 17, and insert the screw plug 31
By this, the container is moved to the target storage chamber 3 with the loading / unloading port 17 being closed (the state shown in FIG. 8 (e)).

Then, the loading / unloading port 17 and the loading hole 35 are arranged directly above the opening 9 of the storage chamber 3, and the cylindrical shield 52 is arranged in the same manner as described above.
Is moved down onto the floor 8 to center the opening 9 and the entrance / exit opening 17 while enclosing the opening 9 and the entrance / exit opening 17 in a ring shape, and after retracting the movable shield 38 from the entrance / exit opening 17,
The radioactive object 1 is accommodated in the cylindrical pit 4 by hanging the radioactive object 1 from the opening 9 into the cylindrical pit 4 (see FIG. 6) of the storage chamber 3 and releasing the chuck 15, and then lifted again and the lid is closed in the same manner. While rotating the body 12, the whole radioactive object 1 is stored in the cylindrical pit 4. After that, the shield plug 10 is placed right above the loading / unloading opening 17 and is hung down to open the opening 9
Finally, the cap 25 placed on the inner bottom of the shielding container 11 is gripped by the chuck 15 and hung down from the loading / unloading port 17, and the opening 9 is closed from above the shielding plug 10 to form one cylindrical pit. The filling operation for 4 is completed.

In this series of operations, the radiation from the radioactive object 1 is shielded by the shielding container 11, and the upper and lower ventilation channels are provided.
In the case of 32.46, since the ventilation channels 32.46 are bent in a spiral shape, the radiation is prevented from going straight, and is scattered or absorbed in the screw plugs 31.45 or the walls of the shielding container 11 or the lid 12. Therefore, it is possible to prevent the shielding container 11 from leaking to the outside. Also, the radioactive object 1
When the shielding container 11 is stopped during the lifting and lowering work, etc., the tubular shielding member 52 surrounds the inlet / outlet opening 17 and the opening 9 in a ring shape, so that the space between the shielding container 11 and the floor 8 can be prevented. Radiation leakage can also be prevented.

On the other hand, since the ventilation passages 32 and 46 are formed in the upper and lower portions, both of the ventilation passages 32 and 46 are formed by the decay heat of the radioactive object 1.
A flow of air is generated through 46, and heat can be effectively dissipated. Therefore, even if the transport device 2 is stopped due to loss of the drive source or the like in the middle of the transport work, it is possible to avoid a situation in which the transport device 2 is in a high temperature state during the recovery work, and the soundness of the device is improved. Can be maintained.

In addition, although the inlet / outlet opening is provided at the bottom of the shielding container in the above-mentioned one embodiment, the lid may be provided with an inlet / outlet opening to place a radioactive object in the shielding container, in which case the bottom wall of the shielding container is It may be a turning table. Further, the configuration for transporting a plurality of radioactive objects at a time is shown, but one radioactive object may be transported, and in that case, the turning mechanism and the turning table are unnecessary.

"Effects of Device" As is clear from the above description, the transport device of the present invention has the following effects.

(I) Radiation can be shielded by the shielding container, and the entrance / exit opening can be closed by the movable shield of the shutter mechanism to reliably prevent leakage of radiation during transportation or the like. In addition, during the work of putting in and out the radiation object, etc.
The tubular shield surrounds the space between the access port and the opening, and can reliably prevent leakage of radiation from between these spaces.

(Ii) Since at least one of the ring-shaped projection and the recessed portion around the opening of the cylindrical shield has a tapered surface, the two can be accurately aligned by the aligning action of the fitting of the tapered surface. Therefore, it is possible to smoothly carry out the work of taking in and out the radiation object through the taking-out port and the opening.

[Brief description of drawings]

The drawings show an embodiment of the carrying device of the present invention.
The figure is an overall vertical cross-sectional view, FIG. 2 is a vertical cross-sectional view showing the relationship between the ring-shaped projections of the tubular shield and the recesses around the opening, and FIG. 3 is a part taken along line III-III in FIG. The cross-section arrow view, 4th
FIG. 5 is a plan view of a half of FIG. 1, which is a cross section, FIG. 5 is a plan view of a guide, FIG. 6 is a perspective cross-sectional view of a storage facility having a carrying device according to an embodiment, and FIG. FIG. 8A to FIG. 8E are perspective views in the vicinity of the transport device, which are model diagrams sequentially showing the work of storing the radioactive object in the shielding container. 1 ... radioactive object, 2 ... conveying device, 3 ... storage room, 4
…… Cylindrical pit, 5 …… Transfer chamber, 6A …… Rail for traveling,
6B: Traverse rail, 7: Traveling platform, 8: Ceiling (floor), 9: Opening, 10: Shielding plug, 11 ... Shielding container, 12 ... Lid, 13 ... Turning mechanism, 14 …… Lifting mechanism, 15 …… Chuck, 16 …… Guide, 17 …… Entrance / exit, 18 …… Shutter mechanism, 19 …… Auxiliary shielding mechanism, 21 ……
Frame, 22 …… Wheels, 23 …… Traveling mechanism, 24 …… Dimples, 25
…… Cap, 26 …… Bearing, 27 …… Drive motor, 28…
… Pinion, 29 …… Rack, 30 …… Vent hole, 31 …… Screw plug, 32 …… Ventilation flow path, 33 …… Winding machine, 34
...... Wire, 35 …… Loading hole, 36 …… Bracket, 37 ……
Recess, 38 …… Movable shield, 39 …… Rail, 40 …… Screw shaft, 41 …… Coupler, 42 …… Drive rod, 43 …… Drive motor, 44 …… Vent hole, 45 …… Screw plug, 46 ... Ventilation channel, 51 ... Ring-shaped recess, 52 ... Cylindrical shield, 53 ...
… Guide rod, 54 …… Screw shaft, 55 …… Drive motor, 56
...... Recess, 57 ...... Ring-shaped projection, 56a ・ 57a …… Tapered surface.

Claims (1)

[Scope of utility model registration request] 1. A transfer chamber (5) is movably disposed inside the transfer chamber.
A transporting device (2) for loading and unloading the radioactive object (1) from the loading / unloading port (17), which is aligned above an opening (9) opened vertically through the floor (8), A shielding container (11) for accommodating a radioactive object, a shutter mechanism (18) arranged at an inlet / outlet port of the shielding container to open / close the inlet / outlet port by a movable shield (38), and a cylindrical shield surrounding the inlet / outlet port. An auxiliary shielding mechanism (19) for projecting and retracting (52) from the outer surface of the shielding container is provided, and the cylindrical shielding body of the auxiliary shielding mechanism is vertically moved when the cylindrical shielding body projects downward from the shielding container. A ring-shaped protrusion (57) for positioning the traveling position by fitting with the recessed portion (56) of the opening which is opened in a penetrating state is provided, and the outer peripheral surface of the ring-shaped protrusion and the inner peripheral surface of the recessed portion are Characterized in that at least one is formed in a tapered surface A device for transporting radioactive objects.