JPS6367880B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for solidifying radioactive waste in which a drum is filled with a mixture of radioactive waste and a solidifying material such as cement or plastic to form a solidified body.

Generally, radioactive waste is mixed with a solidifying material such as cement, asphalt, or plastic, and the mixture is filled into drums and stored as a solidified material at a designated location. In other words, an empty drum is fed to a rotating table by a feeding device, the table is rotated and filled with radioactive waste and solidification material, and then a temporary lid with an N ₂ gas replacement port is attached using a temporary lid attaching/detaching device, and N ₂ gas is supplied. The device replaces the inside of the drum with N ₂ gas, solidifies and cures it, and then removes it from the drum using a temporary lid attaching/detaching device.The lid attaching device attaches the main lid to the drum, and the drum discharging device removes it from the drum. The solidified material drums were taken out and transported to a designated storage location. However, the above-described solidification treatment method requires two entrances and exits each having a shielding door to supply and take out the drums, and also requires separate drum supply and takeout devices. In addition, in order to replace the inside of the drum with N ₂ gas, a device for attaching and detaching a temporary lid with an N ₂ gas replacement port is required, and since the supply position of the drum can varies, it is necessary to replace the N ₂ gas supply device and the temporary lid. _N2
The connection operation with the gas replacement port was extremely difficult.

The present invention was obtained as a result of studies aimed at solving the drawbacks of the solidification treatment method as described above.

That is, the present invention is for filling a drum with a mixture of radioactive waste and a solidifying material to form a solidified body, in which an empty drum is fed to a rotary table, the table is rotated to move the drum to a filling position, and the mixture is filled. Next, the lid is closed with a movable temporary lid provided integrally on the rotary table, and N ₂ gas is supplied from the temporary lid to replace the inside of the can with N ₂ gas, while the drum filled with the mixture is moved by the rotation of the table. The mixture is solidified and cured to form a solidified product, the temporary lid is opened and the main lid is attached, and the drum that has become the solidified product is taken out from the same position as the supply position of the empty drum. The present invention provides a method for solidifying waste.

Fig. 1 shows a schematic front view of one embodiment of the radioactive waste solidification processing apparatus of the present invention, Fig. 2 shows its plan view, Fig. 3 shows an enlarged view of part A, and Fig. 4 A Z-arrow view is shown and a Y-arrow view is shown in FIG. 5, and the configuration thereof will be explained based on the drawings.

1 is a drum can supply/takeout device with a shielding door.
The drums are reloaded by reciprocating between a drum transport device (not shown) provided at T ₁ and T ₂ and the rotary table 2. 3 is a fixed axis, N ₂
An N ₂ gas supply hole a and an exhaust hole b communicating with the gas supply pipe 7 and the exhaust pipe 8 are provided. Reference numeral 4 denotes a table for placing drums, which is supported by a roller support 6 and rotated intermittently by a drive device 5. Reference numeral 9 denotes a temporary lid device provided corresponding to the position on the table 4 where the drum can is placed. Reference numeral 10 denotes a support base for a temporary lid device 9 provided integrally with the table 4, and includes an N ₂ gas supply hole a'' and an exhaust gas communicating with the N ₂ gas supply hole a and exhaust hole b bored in the fixed shaft 3. A hole b'' is drilled, and the _N2 gas supply hole a' is always connected to the _N2 gas supply hole a.
The exhaust hole b' communicates with the exhaust hole b only at the N ₂ gas replacement position. Reference numeral 11 denotes a switching valve for the N ₂ gas supply path and the exhaust path provided on the support base 10, which opens and closes the N ₂ gas supply path and the exhaust path in conjunction with the operation of the swinging rod 12. One end of the swinging rod 12 is connected to the switching valve 11, and the other end is connected to a temporary lid 13. The swinging rod 12 and the temporary lid 13 are provided with an N ₂ gas supply hole a and an exhaust hole b, which communicate with the N ₂ gas supply hole a'' and the exhaust hole b''. Further, an elastic sealing member is attached to the temporary lid 13. Reference numeral 14 denotes an operating rod, which is provided integrally with the switching valve 11 interposed therebetween. 1
Reference numeral 5 denotes an opening/closing device for operating the temporary lid device 9, which is provided at a position where the mixture is filled and the temporary lid 13 is closed, and at a position where the lid is opened to attach the main lid. 1
6 is an operating piece of the opening/closing device 15, and the operating rod 1
4 and is moved up and down by the cylinder 17 to close the temporary lid 1.
Open and close 3. Reference numeral 18 is a filling device that injects a predetermined amount of a mixture of radioactive waste and solidification material into the drum, and 19 is a lid mounting device that supplies and attaches a main lid to the drum. 20 is a control device consisting of an operation setting circuit, an arithmetic circuit, an operation command circuit, and the like.

The processing operation by the radioactive waste solidification processing apparatus having the above configuration will be explained based on the operation sequence diagram (FIG. 6).

First, radioactive waste and solidifying material are supplied at a predetermined ratio to a mixing tank of the filling device 18 and stirred to form a mixture, and a predetermined number of empty drums D are prepared in a drum conveying device (not shown). At this time, the drum can supply/take-out device 1 is in a standby position between the shielding door _T1 and the shielding door _T2 . Next, the solidification processing device is started and an operation command signal is sent from the control device 20 to the shielding door _T1 to open it. When the shielding door _T1 opens, the control device 20
sends an operation command signal to the supply/take-out device 1 to move it from the standby position to the drum delivery position of the transport device (not shown), and also sends an operation command signal to the transport device (not shown) to move the empty drum D ₁ to the delivery position. move it to When the supply and take-out device 1 moves and the empty drum D ₁ is placed at the delivery position, the control device 20 sends an operation command signal to the empty drum D _{1 .}
is transshipped from a conveying device (not shown) to a supply/unloading device 1. When the empty drum D ₁ is transferred to the supply and take-out device 1, an operation command signal is sent from the control device 20 to the supply and take-out device 1 to move it to the standby position. When the supply/takeout device 1 moves to the standby position, the control device 20 sends an operation command signal to the shielding door _T1 to close it.
When the shield door T ₁ closes, the control device 20 sends the shield door
Send an operation command signal to _T2 to open it. At the same time, the operation command signal is sent to the shield door _T2 , and the operation command signal is sent to the cylinder 17 of the opening/closing device 15 located at the drum delivery position to lower the actuation piece 16.
The operating rod 14 of the temporary lid device 9 engaged with the temporary lid 13 is pushed down to open the temporary lid 13 upward. Said shielding door
When T ₂ and the temporary lid 13 are opened, the control device 20
An operation command signal is sent to the supply/take-out device 1 to move it to the drum delivery position on the rotary table 2. When the supply and take-out device 1 moves to the delivery position, an operation command signal is sent from the control device 20 to the supply and take-out device 1, and the empty drum can _D1 is transferred from the supply and take-out device 1 to the table 4. (Fig. 6-1) When the empty drum _D1 is transferred to the table 4, an operation command signal is sent from the control device 20 to the supply/take-out device 1 to move it to the standby position. When the supply/takeout device 1 moves to the standby position, the control device 20 sends an operation command signal to the shielding door _T2 to close it. The supply/take-out device 1 waits in a standby position until the next operation. When the empty drum can D ₁ is transferred to the table 4, an operation command signal is sent from the control device 20 to the cylinder 17 of the opening/closing device 15 to raise the actuating piece 16, and the actuating rod of the temporary lid device 9 engaged with the actuating piece 16 is raised. 14 to engage the temporary lid 13 with the empty drum _D1 and close the lid. Drum can D ₁ with empty temporary lid 13
When the lid is closed, the control device 20 sends an operation command signal to the drive device 5 to rotate the table 4 and remove the empty drum.
Move D ₁ to the mixture filling position. (No. 6-2
Figure) When the empty drum D ₁ moves to the mixture filling position, the control device 20 sends an operation command signal to the cylinder 17 of the opening/closing device 15 to lower the actuating piece 16, and the temporary lid device is engaged with the actuating piece 16. 9 is pushed down to open the temporary cover 13. Temporary lid 1
3 is opened, the control device 20 sends an operation command signal to the filling device 18, and a mixture of radioactive waste and solidification material is injected into the empty drum _D1 . Empty drum D ₁
When a predetermined amount of the mixture is injected into the cylinder 17 of the opening/closing device 15, the control device 20 sends an operation command signal to the cylinder 17 of the opening/closing device 15 to raise the actuating piece 16 and temporarily push up the actuating rod 14 of the temporary lid device 9 that is engaged with the actuating piece 16. Lid 13
is engaged with the drum D′ ₁ filled with the mixture and the lid is closed. When the temporary lid 13 closes the drum D' ₁ , the control device 20 sends an operation command signal to the drive device 5 to rotate the table 4 and move the drum D' ₁ to the _N2 gas replacement position. (Fig. 6-3) Front temporary lid 13
The switching valve 11 is closed by closing the drum D′ ₁ .
is switched, and the N ₂ gas path a and the exhaust path b are communicated with each other. When the drum D' ₁ moves to the _N2 gas replacement position, the exhaust hole b of the fixed shaft 3 and the temporary lid device 9
_N2 gas is supplied to the drum can D' ₁ through communication with the exhaust hole b' of the support stand 10, and air, etc. inside the can is discharged through the exhaust hole b, and the inside of the can is replaced with _N2 gas. When the N ₂ gas replacement in the drum D' ₁ is completed, the drive device 20 sends an operation command signal to the drive device 5, and the drum is intermittently rotated in the order of numbers (1 to 13) listed in the table 4 in FIG. Move D′ ₁ to the lid attachment position. (Figure 6-4) While the drum D' ₁ was moving, _N2 gas inside the drum leaked out _.
When the gas pressure decreases, N ₂ gas is constantly supplied to maintain a predetermined pressure.

While the drum D' ₁ is moving, the control device 20 sends operation command signals to the shielding doors T ₁ and T ₂ and the supply/take-out device 1, respectively, and repeats the same operation as the empty drum D ₁ to remove the empty drum D _{2 .} to the standby position. When the drum D' ₁ moves to the lid mounting position, the control device 20 sends an operation command signal to the cylinder 16 of the opening/closing device 15 at the drum delivery position to lower the actuating piece 17 and temporarily push down the actuating rod 14 of the temporary lid device 9. The lid 13 is opened upward. Temporary lid 13
When the door T2 opens, the control device 20 sends an operation command signal to the shielding door _T2 to open it. When the shielding door T ₂ opens, the control device 20 sends an operation command signal to the supply/takeout device 1 to move it to the drum delivery position on the rotary table 2 . When the supply and take-out device 1 moves to the delivery position, the control device 20 sends an operation command signal to the supply and take-out device 1, and the empty drum can _D2 moves to the supply and take-out device 1.
It is then transshipped to table 4. (Figure 6-5)
When the empty drum can D ₂ is transferred to the table 4, an operation command signal is sent from the control device 20 to the supply/unloading device 1 to move it to the standby position. When the supply/takeout device 1 moves to the standby position, the control device 20 sends an operation command signal to the shielding door _T2 to close it. When the empty drum D ₂ is transferred to the table 4, the empty drum D ₁
Filling with radioactive waste by moving sequentially in the same way as
Close the lid with a temporary lid and replace with N ₂ gas. When the drum D' ₂ filled with the mixture and replaced with N ₂ gas is moved to the lid attachment position, the empty drum D ₃ is fed to the table 4 by repeating the same operation as described above. (6th -
Figure 6) The above operations are repeated to supply 13 drums D ₁ to _{D 13} to the table 4 (Figures 6-7), and the drums are filled with a mixture of radioactive waste and solidification material, solidified and cured to become a solidified body. When the first drum can D' ₁ moves to the lid attachment position, the control device 20 sends an operation command signal to the cylinder 17 of the opening/closing device 15 to lower the actuating piece 16 and lower the temporary lid device engaged with the actuating piece 16. 9 is pushed down to open the temporary cover 13. When the temporary lid 13 is opened, the control device 20 sends an operation command signal to the lid mounting device 19 to remove the drum.
Attach main lid d to D′ ₁ . (FIGS. 6-8) When the main lid d is attached to the drum can D' ₁ , an operation command signal is sent from the control device 20 to the drive device 5 to rotate the table 4 and move the drum can D' ₁ to the delivery position.
(FIGS. 6-9) When the drum D' ₁ moves to the delivery position, the control device 20 sends an operation command signal to the shielding door _T2 to open it. When the shielding door T ₂ opens, an operation command signal is sent from the control device 20 to the supply/takeout device 1 to move it to the delivery position on the rotary table 2.
When the supply and take-out device 1 moves to the delivery position, an operation command signal is sent from the control device 20 to the supply and take-out device 1, and the solidified material drum D' ₁ is transferred from the table 4 to the supply and take-out device 1. When the solidified material drum D' ₁ is transferred to the supply/unloading device 1, an operation command signal is sent from the control device 20 to the supply/unloading device 1 to move it to the standby position. When the supply/takeout device 1 moves to the standby position, it sends an operation command signal to the shielding door _T2 to close it. When the shield door T ₂ closes, the control device 20 sends an operation command signal to the shield door T ₁ to open it. When the shielding door _T1 opens, the control device 20 sends an operation command signal to the supply/takeout device 1 to move it to the delivery position of the conveying device (not shown). When the supply and take-out device 1 moves to the delivery position of the transport device (not shown), an operation command signal is sent from the control device 20 to the supply and take-out device 20, and the solidified material drum D' ₁ is transferred from the supply and take-out device 1 to the transport device (not shown). ). solidified drum
When D' ₁ is transferred to a transport device (not shown), an operation command signal is sent from the control device 20 to the transport device (not shown) to transport the solid drum D' ₁ to a predetermined storage location. When the solidified material drum D' ₁ is transported, it is transferred from the control device 20 to the rotary table 2 and the lid mounting device 1.
9. Send operation command signals to the shielding doors T ₁ and T ₂ and the supply/take-out device 1, etc., and sequentially take out the solidified material drums D' ₂ to D' ₁₃ and transport them to respective storage locations to complete one processing operation.

Continuous solidification processing can be performed by supplying an empty drum instead of taking out the solidified drum.

Although the present invention can be practiced as described above, it is not limited to the examples.

a. The number of drums to be placed on the rotary table for processing is not particularly limited, but it is best to place an odd number of drums and move them in multiple pitches so that the temporary lids do not hit each other when opening and closing the temporary lids. b. Drum supply and removal device Of course, it is possible to use a structure in which a drum receiving plate is provided on a cart that moves on the floor or a rail so that it can be raised and lowered, as well as a structure in which the clamping claws are moved up and down.

(c) The table may be configured to rotate intermittently at a predetermined pitch or may be configured to rotate at ultra-low speed.

d The opening/closing devices of the temporary lid device may be provided respectively corresponding to the drum delivery position, the mixture filling position, and the lid mounting position, or may be provided on the table corresponding to each opening/closing device.

(e) Filling of the mixture may be carried out with the drum placed on a table, but if the filling device is installed at a high position, the drum may be lifted and filled using a lifter or the like.

f There is no particular limitation on the timing of attaching the lid to the drum.

g. The operation of the solidification processing device may be controlled by a control device consisting of an operation setting circuit, an arithmetic circuit, an operation designation circuit, etc., and an operation detector;
Control may be performed by combining an operation setting device, an operation detector, a timer, etc.

The present invention, as described above, supplies an empty drum to a rotating table, moves the empty drum to a filling position by rotation of the table, fills the empty drum with a mixture, and then closes the drum with a movable temporary lid provided integrally with the rotating table.
_N2 gas is supplied from the temporary lid to replace the inside of the can with _N2 gas, and in this state, while the drum filled with the mixture is moved by rotating the table, the mixture is solidified and cured to form a solidified body. The following effects can be achieved by opening the lid, attaching the main lid, and taking out the solidified drum from the same position as the empty drum supply position.

(b) Since drums are supplied and removed from one location, there is only one entrance and exit with a drum supply and removal device and a shielding door, which reduces the time for inspection and maintenance.

(b) A movable temporary lid with an N ₂ gas displacement mechanism is provided corresponding to the position where the drum is placed.
There is no need to increase the accuracy of drum can supply, and the drum can supply/take-out device can be made into a device with a simple configuration.

(c) Even if the _N2 gas inside the can leaks after N2 _gas replacement, always
Since N ₂ gas is supplied, the inside of the can can be maintained at a constant pressure.

[Brief explanation of drawings]

FIG. 1 is a schematic front view showing one embodiment of the radioactive waste solidification processing apparatus of the present invention, and FIG. 2 is a plan view thereof. FIG. 3 is an enlarged view of section A in FIG. 1, and FIG. 4 is a view along the Z arrow in FIG.
The figure is a Y-arrow view. FIG. 6 is a processing operation sequence diagram. DESCRIPTION OF SYMBOLS 1... Supply/take-out device, 2... Rotating table, 3... Fixed shaft, 4... Table, 5... Drive device, 6... Roller support, 7... _N2 gas supply pipe, 8... Exhaust pipe, 9...
Temporary lid device, 10... support stand, 11... switching valve, 12...
Swinging rod, 13...Temporary lid, 14...Operating rod, 15...Opening/closing device, 16...Operating piece, 17...Cylinder, 18...
Filling device, 19...lid mounting device, 20...control device.

Claims (1)

[Claims] 1. When a drum is filled with a mixture of radioactive waste and solidification material to form a solidified substance, the empty drum is fed to a rotating table, the table rotates to move the empty drum to the filling position, the mixture is filled, and then the drum is placed on the rotating table. The lid is closed using an integrally provided movable temporary lid, and _N2 gas is supplied from the temporary lid to flush the inside of the can with _N2.
Gas is replaced, and in this state, while the drum filled with the mixture is moved by rotating the table, the mixture is solidified and cured to form a solidified product.The temporary lid is opened and the main lid is attached, and the solidified product is removed. A method for solidifying radioactive waste, characterized in that the empty drum is taken out from the same position as the empty drum can.