JP3175387B2 - Vitrified material transfer equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facility for transferring a vitrified body, and more particularly to a technique for transferring a vitrified body while shielding the same.

[0002]

2. Description of the Related Art The safety of high-level liquid waste generated in facilities related to a nuclear power plant can be enhanced by vitrification.

[0003] In the vitrification facility, an operation of transferring a radioactive transferred object such as a vitrified body from the vitrification facility to a storage facility is performed. When transferring the object to be transferred, it is necessary to transfer the radioactive substance from one facility to another while keeping the radioactive substance in a shielded container.

Conventionally, the transfer work between the facility and the shielding container is performed by opening and closing the loading / unloading port and the shielding container of the facility, and taking the transferred object in and out, so that the transferred object is a vitrified material. In some cases, measures are required to prevent radiation leakage. As one of such measures, a shutter that opens and closes by horizontal movement at a position near the entrance of the shielding container, and a state in which the space between the entrance and exit of the facility and the entrance of the shielding container is isolated from the surroundings by vertical movement. There is a plan to provide a ring-shaped shield.

[0005]

However, if the shutter is moved horizontally by moving the shutter into and out of the shielding container, it is necessary to secure a space corresponding to the range of movement of the shutter, and a mechanism for moving the shield vertically. And the horizontal movement mechanism of the shutter easily interfere with each other, and these mechanisms are complicated, and it is necessary to move the shutter while the shielding container is moved to a desired position. Challenges remain.

The present invention effectively solves such a problem. That is, it is an object of the present invention to simplify the transfer of the transferred object and the transfer of the transferred object by the shielding container, and to enhance the isolation of the transferred object from the surrounding environment when the transferred object is moved in and out.

[0007]

In order to achieve the above object, the present invention proposes a plurality of means. First
Means comprises a transport trench disposed between and connected to a discharge port opened in the floor of the first processing chamber and a receiving port opened in the floor of the second processing chamber. A shutter disposed at the delivery port and the reception port to open and close the opening, a transfer carriage disposed reciprocally inside the transfer trench, and loaded and unloaded from above mounted on the transfer carriage from above. And a shielding container having a hollow storage portion. In the second means, the first means is formed with an annular recess in a downward state around the delivery port or the receiving port,
A plug that closes the upper opening of the hollow storage section by inserting from above into the shielding container, and an auxiliary shield that is disposed around the upper opening and that is engaged with the annular recess when moving upward by the lifting mechanism is provided. It is a facility for transferring vitrified bodies to which the configuration described above has been added. The third means includes: an inner fixed shielding wall positioned inside the transfer area and protruding downward around the discharge port or the receiving port; and a transfer area larger than the inner fixed shield wall. The outside fixed shielding wall which is located outside the outside and has a large amount of downward projection is integrally provided, and a plug closing the upper opening of the hollow storage part and a horizontal rotation around the upper opening are provided in the shielding container. Transfer of a vitrified body having a configuration in which an upper protruding rotating main shielding wall is provided which overlaps the outer periphery of the inner fixed shielding wall and a part of the inner periphery of the outer fixed shielding wall. Equipment.

[0008]

In the transfer facility for vitrified material according to the first means, the shutter is isolated between the delivery trench and the delivery trench of the first processing chamber and the second processing chamber and the transport trench, and the transfer is performed. The shutter is opened only when passing through the transfer body. In a state where the object to be transferred is loaded from above into the hollow storage portion of the shielding container, the transfer between the two processing chambers is performed by the transfer trolley, and the transfer chamber is positioned with respect to the receiving port of the second processing chamber. The transferred object is taken over by pulling out upward. In the facility for transferring the vitrified material according to the second means, in addition to the function of the first means, at the time of delivery of the transferred object, the surrounding shield is engaged by engaging the auxiliary shield with the annular concave portion. The hollow housing is opened without increasing the space by pulling the plug upward. In the facility for transferring vitrified material according to the third means, in addition to the action of the first means, the delivery of the transferred object is performed by setting the rotation position of the rotary main shielding wall when the transferred object is delivered. The transferred object is taken up and down in a shielded state in which the area around the inner fixed shield wall of the mouth or the reception port is surrounded by the rotating main shield wall and the outer fixed shield wall. During the transfer of the object to be transferred from the delivery port to the reception port, the rotary main shielding wall is horizontally rotated by 180 degrees, thereby switching the shielding from the delivery port to the reception port by the rotating main shielding wall. By pulling out the plug upwardly, the opening of the hollow storage part is performed in the same manner as the second means.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of a facility for transferring a vitrified material according to the present invention will be described with reference to FIGS. 1 to 7, reference numeral A denotes a vitrification facility, B denotes a radioactive waste storage, C denotes a vitrified body transfer facility (transfer facility), P denotes a transferred body (vitrified body), and E denotes a transfer. Range 1, 1st processing chamber (transfer chamber), 2 floor, 3 outlet, 4 shutter, 5 overhead crane, 6 guide sleeve, 7 shock absorber, 11 second processing chamber (Receiving room), 12 is a floor, 13 is a receiving port, 14
Is a shutter, 15 is an overhead crane, 20 is a transport trench, 21 is a transfer trolley, 22 is a shielded container, 23 is a traveling platform, 24 is wheels, 25 is a traveling mechanism, 26 is a turning mechanism,
7 is a plug, 28 is an auxiliary shield, and 29 is an elevating mechanism.

[0010] The vitrification facility A is provided with a transferred object P obtained by vitrifying high-level waste liquid.
Is suspended from the delivery port 3 of the floor 2 by the overhead crane 5 of the first processing chamber 1 and delivered to the transfer equipment C by opening the shutter 4, and at this time, the transfer target P is transferred by the guide sleeve 6. While passing through a desired position of the delivery port 3 while performing the positioning and the guide, the shock absorber 7 reduces the impact when the transferred object P falls.

The radioactive waste storage B has a transfer facility C
Then, the transferred object P is lifted by the overhead crane 15 of the second processing chamber 11 via the receiving port 13 of the floor portion 12, and the shutter 14 is opened to open the second processing chamber 11.
After carrying out desired inspection and confirmation work, the transferred object P is taken through the connection port 18 by the floor traveling crane 17 of the storage building 16 and stored in the storage cell chamber 19.

In the transfer equipment C, in addition to the transfer trench 20, the transfer carriage 21, and the shielding container 22, the shutters 4, 14 disposed at the delivery port 3 and the reception port 13, respectively, are shown in FIG. The annular concave portion 3a in a downward state,
13a.

The transport trench 20 is formed in a tunnel between the lower part of the delivery port 3 and the lower part of the receiving port 13 so as to connect them to each other in a tunnel shape and horizontally. .

As shown in FIGS. 2 and 3, the transfer carriage 21 has rails 2 laid inside a transport trench 20.
0a, a traveling base 23 and wheels 24 supported to be reciprocally movable, and a traveling mechanism 2 for rotationally driving the wheels 24.
5 are arranged.

As shown in FIG. 3 and the like, the shielding container 22 has an eccentric hollow storage portion 22a integrally mounted on a traveling stand 23 and surrounded by a two-layer radiation shield made of steel, polyethylene, or the like. A swivel table 22b rotatably supported at the lower portion of the hollow storage portion 22a for mounting, for example, three transferred objects P so as to be able to switch positions; and a spiral ventilation hole arranged at the center of the swivel table 22b. A ventilation duct 22c having an upper opening 2 opening above the hollow storage portion 22a and opening at a substantially central position of the shielding container 22
2d and a breathing opening 22e communicating with the hollow storage portion 22a
A ventilation duct 22f having a helical ventilation hole disposed in the breather opening 22e, a turning mechanism 26 for turning the turning table 22b, and an upper opening 2 of the hollow storage portion 22a.
A plug 27 for closing 2d by inserting it from above is provided.

As shown in FIGS. 4 and 5, the traveling mechanism 25 is set in an operating state by remote control, and
, A traveling motor 25a for setting the transfer position, a speed reducer 25b, and a rotational force transmission system 25c.

As shown in FIGS. 3 and 5, the turning mechanism 26 has a turning motor 26a for setting a turning position, which is brought into an operating state by remote control, a speed reducer 26b,
A torque transmitting system 26c such as a pinion gear and a rack gear for transmitting the torque to the turning table 22b is provided.

The plug 27 is sealed by inserting it into the upper opening 22d of the shielding container 22, and is detached by being suspended by the overhead cranes 5 and 15.

As shown in FIGS. 3 and 4, the auxiliary shield 28 is formed in a ring shape which can be moved up and down around the upper opening 22d of the shield container 22, and has a delivery port 3 and a reception port 13. Is set in a shape to be inserted from below into the annular concave portions 3a and 13a.

As shown in FIG. 4, the elevating mechanism 29 includes an elevating motor 29a for setting an elevating position by remote control, a speed reducer 29b, and a torque transmitting system 29c.
And a screw rod 29d screwed to the auxiliary shield 28.

With the vitrified body transfer equipment configured as described above, in a normal case, the space between the first processing chamber 1 and the second processing chamber 11 is The isolation results in a state of isolation.

From the first processing chamber 1 to the second processing chamber 11,
In the case where the transferred object P is transferred as indicated by the arrow in FIG. 1, the overhead crane 5 is kept in a standby state immediately above the delivery port 3, and the shielding container 22 is positioned below the delivery port 3. Further, the auxiliary shield 28 is inserted into the annular recess 3a as shown in FIGS. 3 and 4 by the operation of the elevating mechanism 29.

With the shutter 4 opened, the plug 27 of the shielding container 22 is hung by the overhead crane 5 to open the upper opening 22d, and is temporarily placed in the first processing chamber 1, for example. The first transferred object P is suspended in the outlet 3 by the overhead crane 5 and stored in the hollow storage portion 22a. Next, by the operation of the turning mechanism 26, the turning table 22b is turned at a desired angle, for example, 120 degrees to switch the mounting position, and the second and third transferred objects P are similarly accommodated. When the transferred object P is suspended and unloaded, the shutter 4 is held until just before the transferred object P passes.
Is closed, the shock can be reduced by the shock absorber 7 even in the event that the transferred object P falls in the event of an emergency.

After the transferred object P is accommodated, the plug 27 is suspended by the overhead crane 5 to close the upper opening 22d, and the overhead crane 5 is raised, and the delivery port 3 is shut off by the shutter 4. In addition, the auxiliary shield 28 is lowered by the elevating mechanism 29 so that the auxiliary shield 28 and the annular concave portion 3a are disengaged.

The operation of the traveling mechanism 25 causes the transfer carriage 21
Is transported toward the second processing chamber 11 so that the transfer between the two processing chambers 1 and 11 is performed. During this transfer, the transferred object P is isolated by being shielded by the shielding container 22.
Even if a failure such as the stoppage of 1 occurs, an operator can enter the transport trench 20 and perform maintenance.

With the plug 27 of the shielding container 22 positioned with respect to the receiving port 13 of the second processing chamber 11,
The lifting of the auxiliary shield 28 based on the operation of the elevating mechanism 29 causes the receiving port 13 to engage with the annular concave portion 13a, open the shutter 14, lift the plug 27 by the overhead crane 15 in the second processing chamber 11, and lift the overhead crane. The transfer of the transferred object P from the first processing chamber 1 to the second processing chamber 11 is performed by performing the lifting of the transferred objects P one by one by 15.

At the time of delivery of the transferred object P, the transfer path and the surrounding environment such as the transfer trench 20 are isolated by engaging the auxiliary shield 28 with the annular concave portions 3a and 13a. It is. The opening of the upper opening 22d of the hollow storage portion 22a in the shielding container 22 is performed by simply pulling the plug 27 upward. Therefore, expansion of the space above the shielding container 22 can be suppressed.

Hereinafter, a second embodiment of a facility for transferring a vitrified material according to the present invention will be described with reference to FIGS. In each of these figures, reference numeral 31 denotes an inner fixed shielding wall,
32 is an outer fixed shielding wall, 33 is a main rotating shielding wall, 34 is a rotation auxiliary shielding wall, and 35 is a shielding wall rotating mechanism.

The inner fixed shielding wall 31 is provided with the outlet 3
Alternatively, it is disposed, for example, in an annular shape around the lower opening of the receiving port 13 so as to protrude downward, and is formed over at least a half circumference at a position outside the transfer range E.

The outer fixed shielding wall 32 is also provided with the outlet 3
Alternatively, it is arranged so as to protrude downward around the lower opening of the receiving port 13, but the protruding amount is larger than the inner fixed shielding wall 31 and formed over a half circumference at a position outside the transfer range E.

The rotary main shielding wall 33 is arranged such that its radial position is larger than the inner fixed shielding wall 31 around the upper opening 22d of the shielding container 22 shown in FIG. The protrusion is arranged so as to be horizontally rotatable so as to protrude upward, so that the protrusion amount overlaps the outer portion of the inner fixed shielding wall 31 as shown in FIG. 8, and is slightly longer than a half circumference. Is set.

The rotation auxiliary shielding wall 34 is arranged so as to rotate integrally with the rotation main shielding wall 33, and overlaps with the inner periphery of the outer fixed shielding wall 32, and further includes the rotation main shielding wall 3.
It is set so that the amount of protrusion above 3 becomes smaller.

The shield wall rotating mechanism 35 has an angle setting motor 35 for setting a rotation angle by remote control.
a and a torque transmitting system 35b such as a speed reducer, a rotating shaft, a bevel gear, etc.
, A pinion gear 35c, and a rack gear 35d disposed on the inner periphery of the rotation main shielding wall 33 and the rotation auxiliary shielding wall 34 and meshing with the pinion gear 35c.

In the second embodiment of the transfer equipment having these structures, the rotation angle of the rotary main shielding wall 33 is set by the operation of the shielding wall rotating mechanism 35 as shown by the arrow in FIG. When the container 22 is moved between the first processing chamber 1 and the second processing chamber 11 as shown by an arrow in FIG. 10, the rotation position of the rotary main shielding wall 33 is inside the transfer range E. Is operated as follows. Hereinafter, the transfer object P is delivered by disposing the transfer cart 21 and the shielding container 22 immediately below the delivery port 3 or the reception port 13.

At the time of delivery of the transferred object P, as shown in FIG. 8, for example, the outside of the inner fixed shielding wall 31 at the delivery port 3 is covered by the rotating main shielding wall 33, and around the rotation assisting shielding wall 34. Is covered by the outer fixed shielding wall 32, so that the risk that the radioactive substance attached to the transferred object P diffuses into the transport trench 20 is avoided. The transfer inside the transport trench 20 is performed by plugging the upper opening 22 d of the shielding container 22 with the plug 2.
7 in a closed state.

During the transfer of the transferred object P from the delivery port 3 to the receiving port 13, the rotation of the rotation auxiliary shielding wall 34 is rotated by 180 degrees by the operation of the shielding wall rotating mechanism 35, and the inside of the rotation auxiliary shielding wall 34 is rotated. Is set so as to face the inner fixed shielding wall 31 in the receiving port 13, and preparation for isolating the receiving port 13 by the rotation auxiliary shielding wall 34 is performed. By the remote operation of the transfer cart 21, the transfer is stopped so that the upper opening 22d of the shielding container 22 is located immediately below the receiving port 13. Hereinafter, the transfer of the transferred object P from the shielding container 22 to the second processing chamber 11 is performed. Will be implemented.

Next, a third embodiment of the facility for transferring a vitrified material according to the present invention will be described with reference to FIGS. In these figures, 3b and 13b are lower inner walls, 3c and 13c are lower outer walls, 3d and 13d are lower surfaces, 20b is a ceiling surface, 41 is a shielding block, and 42 is an engagement shielding wall.

In the examples shown in FIGS. 11 and 12, the lower inner side walls 3b, 13b and the lower outer side walls 3c, 13c are formed in a stepped shape projecting below the ceiling surface 20b, and the lower surfaces 3d, 13d are located between them. Is set to a height such that the shielding block 41 does not come into contact with the lower surfaces 3d and 13d, and the engagement shielding wall 42 has a pair of upper openings 22d separated in the transfer direction. The engagement shielding wall 42 is disposed above the shielding block 41, and is set in a staircase shape to be engaged with the lower inner side walls 3b and 13b.

When the transfer of the transferred object P is performed, the upper opening 22d of the shielding container 22 is positioned below the delivery port 3 and outside the transfer range, for example, as shown in FIG. Simultaneously with this alignment, the transport trench 20 is isolated by engaging the engagement shielding wall 42 with the lower inner wall 3b of the delivery port 3. Even when the shielding container 22 is aligned with the receiving port 13, the inside of the transfer range E is isolated from the receiving port 13. When the transferred object P is transferred from the delivery port 3 to the receiving port 13, there is no operation of moving the engagement shielding wall 42 with respect to the shielding container 22, but the position of the transferred object P is determined by the turning operation of the turning table 22 b. The transfer object P is taken in and out while switching the state. You
That is, the delivery port 3 or the reception port 13 and the transport tray
And the shielding container 22 on either side of the transfer direction.
If you move it, it will be in the isolated state. Therefore, shielding
Position the container 22 in the delivery port 3 or the reception port 13.
By doing so, the shielding container engages with the shielding container 22.
Without moving the wall 42, the outlet 3 or the receiving port 3
Inside the transfer range of the transport trench 20 with respect to the entrance 13
Can be easily shielded.

[0040]

As described above, according to the vitrified body transfer equipment of the present invention, the following effects can be obtained. (1) The shutter is isolated between the transfer opening and the receiving opening of the first processing chamber and the second processing chamber and the transfer trench, and the shutter is opened only when the transfer object is passed. When the transfer object is loaded into the transfer chamber, the transfer is performed between the two processing chambers by the transfer cart, and the transfer object is transferred while being aligned with the delivery port and the reception port. In addition, the transfer of the transferred object can be simplified. (2) Since the transferred object is loaded and unloaded to and from the hollow storage portion of the shielding container by an operation from above, the transfer object can be easily taken in and out. (3) In addition to isolation from the surrounding environment by engaging the auxiliary shield with the annular recess when the transferred object is taken in and out, the upper opening of the shield container is closed by inserting a plug. Thus, isolation and removal of the transferred object can be performed by a simple operation. (4) By closing the upper opening of the shielding container with a plug, it is possible to suppress an increase in space for shielding the shielding container. (5) As described above, the transferred object is in the middle of being transferred while the transferred object is being isolated by the shielding container. To perform maintenance. (6) An inner fixed shielding wall projecting downward and an outer fixed shielding wall having a larger downward projecting amount are arranged around the feed-out opening or the receiving opening, and can be horizontally rotated around the upper opening of the shielding container. With the configuration in which the rotating main shielding wall protruding upward is disposed, the rotating main shielding wall is rotated with the rotation operation, thereby facilitating shielding between the outlet or the receiving port and the shielding container, and In addition, the transfer of the transferred object from the delivery port to the reception port can be quickly performed.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a first embodiment of a facility for transferring a vitrified product according to the present invention.

FIG. 2 is a perspective view in which a part of a portion of the shielding container of FIG. 1 is sectioned;

FIG. 3 is a front sectional view of a part of the shielding container of FIG. 1;

FIG. 4 is a left side view showing the first embodiment of the facility for transferring a vitrified material according to the present invention.

FIG. 5 is a plan view of a transfer cart portion and the like in FIG. 1;

FIG. 6 is a plan view of a portion of the shielding container of FIG. 1;

FIG. 7 is a front view showing a transfer state by the transfer equipment of the first embodiment.

FIG. 8 is a front sectional view of a main part of a second embodiment of a facility for transferring a vitrified body according to the present invention.

9 is a plan view of a part of the shielding container in FIG.

FIG. 10 is a front view showing a transfer situation by the transfer equipment of the second embodiment.

FIG. 11 is a diagram showing a third example of the facility for transferring a vitrified product according to the present invention.
It is a front sectional view of the important section showing an example.

FIG. 12 is a plan view of the shielding container shown in FIG.

[Explanation of symbols]

 A Vitrification Facility B Radioactive Waste Storage C Vitrified Waste Transfer Facility (Transfer Facility) P Transferred Body (Vitrified Body) E Transfer Range 1 First Processing Room (Transfer Chamber) 2 Floor 3 Delivery Port 3a Annular Recess 3b Lower inner wall 3c Lower outer wall 3d Lower surface 4 Shutter 5 Overhead crane 6 Guide sleeve 7 Shock absorber 11 Second processing chamber (receiving chamber) 12 Floor 13 Receiving port 13a Annular recess 13b Lower inner wall 13c Lower outer Wall 13d Lower surface 14 Shutter 15 Overhead crane 16 Storage building 17 Floor traveling crane 18 Connection port 19 Storage cell room 20 Transport trench 20a Rail 20b Ceiling surface 21 Transfer trolley 22 Shielding container 22a Hollow storage section 22b Swivel table 22c Ventilation duct 22d Upper opening 22e breather opening 22f ventilation duct 23 running Mount 24 Wheel 25 Traveling mechanism 25a Traveling motor 25b Reduction gear 25c Rotational power transmission system 26 Rotating mechanism 26a Rotation motor 26b Reduction gear 26c Rotational power transmission system 27 Plug 28 Auxiliary shield 29 Lifting mechanism 29a Lifting motor 29b Reduction gear 29c Rotating power transmission System 29d Screw rod 31 Inside fixed shielding wall 32 Outside fixed shielding wall 33 Rotation main shielding wall 34 Rotation auxiliary shielding wall 35 Shielding wall rotating mechanism 41 Shielding block 42 Engagement shielding wall

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuo Kubota 3-2-16 Toyosu, Koto-ku, Tokyo Ishikawa-jima-Harima Heavy Industries, Ltd. Toyosu General Office (56) References JP-A-54-121400 (JP, A) JP-A-60-95395 (JP, A) JP-A-6-324194 (JP, A) JP-A-7-5293 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) G21F 9/36 G21F 7/005 G21F 7/047

Claims (3)

(57) [Claims] 1. A transfer trench disposed between a discharge port opened in a floor of a first processing chamber and a receiving port opened in a floor of a second processing chamber so that they are connected to each other. A shutter disposed at the delivery port and the receiving port for opening and closing the transfer port, a transfer truck disposed reciprocally inside the transport trench, and loading and unloading of the transferred object mounted on the transfer truck from above. And a shielding container having a hollow storage portion. 2. A plug formed with a downwardly facing annular recess around the delivery port or the reception port, and closing the upper opening of the hollow storage portion in the shielding container by being inserted from above,
2. A facility for transferring a vitrified body according to claim 1, further comprising an auxiliary shield disposed around the upper opening and engaged with the annular concave portion when moving upward by the lifting mechanism. 3. Around the delivery port or the receiving port,
An inner fixed shielding wall that is located inside the transfer range and protrudes downward, and an outer fixed shielding wall that is positioned outside the transfer range and has a larger downward projection than the inner fixed shield wall is integrated. And a plug closing the upper opening of the hollow storage portion in the shielding container, and a part of the outer periphery of the inner fixed shielding wall and a part of the inner periphery of the outer fixed shielding wall arranged so as to be horizontally rotatable around the upper opening. And a rotating main shielding wall projecting upward and overlapping with the rotating main shielding wall.
A transfer facility for the vitrified product according to the above.