JP3001704B2 - Transport truck for internal pump motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carrier for an internal pump motor of an internal pump disposed below a reactor pressure vessel of a boiling water reactor, and more particularly to improvement of workability and safety. It is related to a configuration aiming at.

[0002]

2. Description of the Related Art In a boiling water reactor equipped with an internal pump, an internal pump motor is detached from a motor casing at the time of periodic inspection or the like, and is re-attached to the motor casing after inspection. At this time, the inspection of the internal pump motor itself is performed in a repair facility outside the reactor room. For this inspection, the internal pump motor is transported between the reactor chamber and the outside of the reactor chamber by a dedicated carrier truck.

FIGS. 8 and 9 are a partial front view of a lower portion of a boiling water reactor equipped with an internal pump for showing handling of an internal pump motor and a view taken in the direction of arrows along the line ZZ. FIG. 2 is a plan view, in which a motor casing 3 is integrally attached to a lower portion of the reactor pressure vessel 1, and a pair of guide screws 4 is attached to both side surfaces of the motor casing 3. Reference numeral 2 denotes a control rod drive mechanism attached to the lower part of the reactor pressure vessel 1. On the other hand, above the vicinity of the exit of the equipment entrance 6 in the reactor chamber 5, an electric chain block 8 that can hang the internal pump motor 7 when carrying in and out is installed. A swivel platform 9 that can swivel is installed below the reactor pressure vessel 1. An internal pump motor elevating device 10 is supported inside the revolving platform 9 so that the internal pump motor elevating device 10 can be moved up and down.
A transport trolley rail 13 a is laid so that 11 can travel from the outside of the reactor chamber 12 to the reactor chamber 5 through the equipment entrance 6. A transport trolley rail 13b is laid on the floor of the equipment entrance 6 corresponding to the transport trolley rail 13a. At the lower part of the reactor pressure vessel 1, ten internal pumps 14 shown in FIG. 9 are arranged along the circumferential direction.

FIG. 11 shows a conventional carriage 11. The transport trolley 11 includes a movable trolley 15, a driving device 16 for self-propelling, and a transport trolley 11 at a location where the operator is close to the trolley 15.
On-site operation box 17 for running
When the internal pump motor 7 is carried in and out, a mounting portion 20 is provided for mounting the internal pump motor 7 in a state of being laid down on the motor container supporting pins 19 of the motor container 18 containing the internal pump motor 7. Also, as shown in FIG. 9, a stretch tube nut handling tool (not shown) for handling a stretch tube nut 21 and a secondary seal 22 necessary for constituting the internal pump 14 are provided on the carriage 15. A stretch tube nut handling tool support 23 for transporting a secondary seal handling tool (not shown) in a state of lying down like the internal pump motor 7;
A secondary seal mounting support 24 is provided. In addition,
Power to the driving device 16 is supplied from outside via a cable (not shown).

[0005] Next, the operation of mounting and removing the internal pump motor 7 will be described. An optional internal pump 14 provided at the lower part of the reactor pressure vessel 1
In addition, when installing the internal pump motor 7,
First, as shown in FIG. 11, the internal pump motor 7 housed in the motor container 18 is mounted on the transport trolley 11 in a sideways state. As shown in FIGS. 8 and 9, the transport cart 11 is moved from the repair facility outside the reactor chamber 12 and transported to the vicinity of the exit of the equipment entrance 6 in the reactor chamber 5. Next, the electric chain block 8 installed above and the hanging ear 25 provided on the motor container 18 are connected. Thereafter, the electric chain block 8 is operated to lift the internal pump motor 7. As the internal pump motor 7 is lifted,
The points supported by 20 gradually move. Therefore, in accordance with the movement, the on-site operation box 17 is operated to move the transport trolley 11. In this way, the lifting operation and the traveling operation are repeated while taking care not to interfere with the control rod drive mechanism 2 and the piping group 26, so that the internal pump motor 7 is finally mounted on the carrier 11 , Stand upright. Next, the electric chain block 8
The motor container supporting pin 19 of the motor container 18 is completely removed from the mounting portion 20 and stopped. After that, the carriage 11 is run in the reverse direction, and temporarily stopped in the equipment entrance 6 outside the reactor chamber 12. Next, the turning platform 9 is turned and the lifting device 10 is turned.
Is positioned directly below where the internal pump motor 7 is suspended. After that, the electric chain block 8 is operated,
The internal pump motor 7 is lowered and seated on the lifting device 10.

Next, the fastening between the internal pump motor 7 and the motor container 18 is released, and only the motor container 18 is lifted again via the electric chain block 8. In this state, the swiveling platform 9 is swiveled to move the carriage 13a again to the carriage 13b laid on the floor of the equipment entrance 6. Next, the transport vehicle 11 is transported to the reactor chamber 5 and stopped at a position where the mounting portion 20 is located immediately below the motor container support pins 19, and then the electric chain block 8 is operated to lower the motor container 18, The motor container support pins 19 are seated on the mounting section 20. After that, the motor container 18 is lowered by the electric chain block 8 and the transport trolley 11 is moved in the reverse procedure to the case where the internal pump motor 7 is set up, and the motor container 18 is turned over. Then, the electric chain block 8 is removed, and the carrier 11 is moved.
The motor container 18 is transported to a repair facility outside the reactor room 12. Thereafter, the internal pump motor 7 on the elevating device 10 is mounted on the motor casing 3 of the target internal pump 14 by using the turning platform 9, the elevating device 10 and the guide screw 4. ◎ Also,
When removing the internal pump motor 7, the operation is performed in the reverse order of the above operation.

On the other hand, when the stretch tube nut handling tool and the secondary seal handling tool are transported and used, a transport cart is used.
By properly using the stretch tube nut handling tool support 23 and the secondary seal handling tool support 24, the handling can be performed in the same manner as the handling procedure of the internal pump motor 7 described above.

[0008]

However, in the above-described handling of the internal pump motor 7, when the internal pump motor 7 mounted on the carriage 11 is lifted by the electric chain block 8, or vice versa. At this time, a large number of control rod drive mechanisms 2 are densely arranged in the lower part of the reactor pressure vessel 1 in the immediate vicinity, and a pipe group 26 is arranged near the upper part of the outlet of the equipment entrance 6.
The space for handling the internal pump motor 7 is extremely small, and the internal pump motor 7 is
One is supported by being suspended by the electric chain block 8, and the other is supported by the transport trolley 11. When the internal pump motor 7 is set up, it is lifted and transported to prevent the internal pump motor 7 from being slanted. Must be repeatedly and skillfully performed, and the internal pump motor 7 may be temporarily in an unstable state. However, since the internal pump motor 7 is large and heavy, it is extremely dangerous and requires a considerably long working time for standing. The operation of the electric chain block 8 is performed in the work space 27 above the equipment entrance 6, and the operation of the carrier 11 is, of course, performed.
Since it is performed in the immediate vicinity of the transport trolley 11, the operation requires human labor.

Further, these problems are particularly problematic when working in a bad environment such as below the reactor pressure vessel 1.

[0010] Therefore, an object of the present invention is to eliminate the need to use an electric chain block or the like and to mount it on a transport trolley.
Another object of the present invention is to provide an internal pump motor carrier that can be set up or turned down in a short time with a simple and safe operation while the carrier cart is stopped.

[0011]

SUMMARY OF THE INVENTION According to the present invention, an internal pump motor is housed in a transfer container for mounting and checking an internal pump motor of an internal pump disposed at a lower portion of a reactor pressure vessel. In a transfer truck of an internal pump motor, which is rotatably mounted on a truck via a shaft member provided in the transfer container, and travels between the reactor chamber and the outside of the reactor chamber, the transfer container is provided. A coupling driving device comprising: a first engaging portion provided at an end of a shaft member provided in the first coupling portion; and a second engaging portion capable of being inserted into and detached from the first engaging portion. And a rollover drive unit connected to the truck via a torque transmission mechanism.

[0012]

The truck on which the transfer container containing the internal pump motor is mounted is moved from the repair facility outside the reactor chamber to a predetermined position in the reactor chamber. Thereafter, when the rollover drive device is driven, the coupling drive device is driven via the torque transmission mechanism, and the first drive device is inserted into the first engagement portion.
The shaft member is rotated via the engaging portion of (1), and the posture of the transport container is changed from the horizontal state to the vertical state. Thereafter, the lifting device provided in the reactor chamber is connected to the transfer container, and thereafter, the second engaging portion is displaced to disengage from the first engaging portion and to maintain this state. Thereafter, the transport container is temporarily lifted by the lifting device together with the internal pump motor until the shaft member is completely removed from the mounting portion. Thereafter, by the same procedure as in the prior art, the transport trolley is moved out of the reactor chamber, and the turning platform provided in the reactor chamber is turned. Thereafter, the transport container together with the internal pump motor is seated on the elevating device of the turning platform, the internal pump motor and the transport container are disengaged, and only the transport container is lifted again. The carrier is again moved to a predetermined position on the turning platform, and only the carrier is mounted on the carrier, and then the carrier is moved out of the reactor chamber. Thereafter, the internal pump motor is moved up to the motor casing by the elevating device and mounted. When removing the internal pump motor, perform the reverse procedure.

[0013]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing the configuration of one embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is AAA of FIG.
FIG. 4 is a side view partially cut along the line A, and FIG.
It is sectional drawing of the principal part along the -Y line.

In FIG. 1 to FIG. 4, a transport vehicle 30 includes a vehicle 31A provided with a driving device 16 for self-propelling and a vehicle 31A.
A motor container support pin provided at 31A and protruding from the left and right sides of a motor container 18A that houses the internal pump motor 7 at the time of carrying in and out near the center of gravity and has a cylindrical portion 19a and a polygonal portion 19b at the tip. A pair of mounting portions 32 mounted via the mounting member 19 and a support portion provided on the carriage 31A for supporting the motor container 18A on one side (right side in FIG. 1) along the longitudinal direction to maintain a horizontal state. 33
And a stopper 34 which is provided on the cart 31A and regulates a state where the motor container 18A is set up vertically (indicated by a two-dot chain line in FIG. 1). It is provided with a connection drive device 35 provided and a rollover drive device 36 provided on the carriage 31A at a position appropriately separated from the connection drive device 35.

Thus, the mounting portion 32 has a semicircular shape corresponding to the cylindrical portion 19a of the motor container support pin 19 at the upper portion and the lower portion at the upper portion of the column 32a having a cross section of [
A groove 32b having an open top is provided.
The cylindrical portion 19a of the motor container support pin 19 is inserted into b, and the motor container 18A is supported.

Further, the above-mentioned connection driving device 35 is provided with a mounting portion.
A housing 37 provided on the carriage 31A at a position outside the column 32a of the 32, and a rotatable support via a bearing 38 concentrically with the motor container support pin 19 at the upper part of the housing 37, and on the inner peripheral surface. A sprocket 39 having a spline hole 39a and a handle 39b at the end of the shaft, a spline shaft 40a engaging with the spline hole 39a of the sprocket 39, and a polygonal portion of the motor container support pin 19
A connection shaft 40 having a polygonal groove 40b corresponding to 19b,
One side is inserted and held in a groove 39c provided on the side surface of the sprocket 39, and the other side is constituted by a spring 41 which constantly presses the connecting shaft 40 toward the motor container support pin 19 side. It is movable in the axial direction while rotating integrally with the. The polygonal groove 40b provided on the connecting shaft 40 is formed in a shape that allows a slight gap to the polygonal portion 19b of the motor container support pin 19.

Further, the above-mentioned rollover driving device 36 is a truck.
A worm reduction mechanism 41 attached to 31A and having a manual handle 41a, a shaft connected to an output shaft 41b of the worm reduction mechanism 41 via a joint, and rotatably supported on the bogie 31A via a bearing base 42. 43, and a sprocket 44 fixed to each end of the shaft 43 and the output shaft 41b.
And a chain 45 stretched between the sprocket 44 and the sprocket 39 of the connection drive unit 35 described above. An idler sprocket 46 is attached to the support 32a of the mounting portion 32 for adjusting the tension of the chain 45.

On the other hand, since each device is of a long size, the work step 47 is mounted beside each of the above-described mounting portions 32 in consideration of the safety of work when the motor container 18A or the like is lifted by the electric chain block 8. . In addition, similarly to the above-described conventional transport vehicle 11, a field operation box 17 for operating the travel of the transport vehicle 30 nearby is mounted on the vehicle 31A, and an external power source is connected to the drive device 16 via a cable (not shown). Is supplied.

When a device other than the above-described internal pump motor 7, a stretch tube handling device for handling the sletch tube nut 21, or a secondary seal handling device for handling the secondary seal 22 is mounted on the transporting trolley 30 and handled. ,
Instead of the support part 33 shown in FIG. 1, a stretch tube nut handling tool / support table 50 shown in FIG. 5 is attached to the truck 31A in each case, or a secondary seal handling tool support table 51 shown in FIG. It can be handled by attaching it to the container 30. Instead of using the motor container 18A, a dedicated outlet tube nut handling tool container 52 and a secondary seal handling tool container 53 are used separately. The configuration is exactly the same as when handling.

Next, the operation of the embodiment configured as described above will be described. When the internal pump motor 7 is transported and handled by the transport trolley 30 in the operation of attaching the internal pump motor 7 to an arbitrary internal pump 14, the internal pump motor 7 is installed in a repair facility outside the reactor room 12. 7 is on its side
30 is mounted via the mounting part 32 and the support part 33, and the equipment entrance 6
The vehicle travels on the carrier truck rail 13a laid on the swivel platform 9 in the reactor chamber 5 through the carrier truck rail 13b laid on the floor, and the internal pump motor 7 is rotated vertically. Is also stopped at a position where it does not interfere with the surrounding control rod drive mechanism 2, the pipe group 26, and the like. After that, to raise the internal pump motor 7 vertically,
The rollover drive device 36 is used.
35 connecting shafts 40 from both sides of the motor container support pins 19
It is necessary to connect to the polygonal portion 19b at the tip of. However, the connecting shaft 40 is usually close to the sprocket 39 with a slight clearance, as shown at a position B in FIG. 4, while the teeth of the spline shaft portion 40a and the spline holes 39a are located at the portion E.
Are not engaged with each other, and are pressed in the direction C by the force of the spring 41 in a displaced state. Therefore, the handle 39b is grasped and pulled in the direction D, and the sprocket 39
When the connection shaft 40 comes into close contact with the connection shaft 40, slightly rotate the connection shaft 40,
The connection shaft 40 is inserted in the direction C by the force of the spring 41 by aligning the teeth of the spline shaft portion 40a with the grooves of the spline hole portion 39a, and the polygonal groove 40b of the connection shaft 40 is The connection is made by fitting into the polygonal portion 19b. Here, the connection shaft 40 is not disconnected during rotation by the pressing force of the spring 41. Thus, the connection by the pair of connection driving devices 35 on both sides is completed.

Next, when the manual handle 41a is turned, the shaft 43 and the sprocket 44 rotate through the worm speed reducer 41, and the torque is further transmitted to the sprocket 39 of the connection driving device 35 through the chain 45, and the final torque is transmitted. Specifically, since the spline hole 39a and the spline shaft 40a of the connection shaft 40 are connected inside the sprocket 39, the connection shaft 40 rotates. That is, by the above operation, the internal pump motor 7 rotates in the vertical direction, and the motor container 18
As shown in FIG. 1, the internal pump motor 7 stands upright, and the internal pump motor 7 stands upright.

Next, the on-site operation box 17 is operated to
30 is moved so that the hanging ears 25 of the motor container 18A are located directly below the electric chain block 8 shown in FIG.
Next, the electric chain block 8 is attached to the hanging ear 25,
In this state, the pair of connecting shafts 40 on both sides are pulled in the direction D shown in FIG.
The connection is released by slightly rotating the groove a to the position where the teeth of the spline shaft portion 40a of the connection shaft 40 do not mesh with the portion E, and then returning the groove slightly in the direction C to fix. Next, the internal pump motor 7 is moved via the electric chain block 8,
Is lifted until it is completely removed from the groove 32b.

After that, the carriage 30 is once operated in the same manner as the conventional procedure for handling the internal pump motor 7.
Is temporarily moved into the equipment carry-in port 6, then the swivel platform 9 is swiveled to position the lifting / lowering device 10 directly below the suspended internal pump motor 7, and then the internal pump motor 7 is hung down, The user is seated on the lifting device 10. Then, from the internal pump motor 7,
Unfasten the motor container 18A and remove the motor container 18A.
Lift only A. The swiveling platform 9 is swiveled again to position the transport truck rail 13a on the transport truck rail 13b laid on the floor of the equipment entrance 6.

Next, the transport vehicle 30 is again mounted on its mounting portion 32.
Is moved to be directly below the suspended motor container 18A. Thereafter, the electric chain block 8 is operated at a low speed, and the motor container 18A is seated on the mounting portion 32. Thereafter, the motor container 18A is laid down on the transport trolley 30 and returned to the repair facility outside the reactor chamber 12 by the procedure opposite to the operation according to the above-described embodiment.

As described above, any internal pump 14
Since the installation work of the internal pump 7 has been completed,
By the same procedure again, the internal pump motor 7 is mounted on the motor casing 3 of the target internal pump 14 next.

A stretch tube nut handling tool 48 for handling the stretch tube nut 21 and the secondary seal 22, which are components of the internal pump 14 shown in FIG.
When the secondary seal handling tool 49 is handled by the above-described transport trolley 30, the stretch tube nut handling tool support base 50 and the secondary seal handling tool support base 51 are attached as shown in FIGS. Only by changing, it can be handled by the same operation as the above-described procedure. However, since the two types of handling tools described above are larger in size than the internal pump motor 7, the rotation radius naturally becomes larger. Therefore, when it is set up vertically, if it is rotated normally, it may interfere with the control rod drive mechanism 2 which is a component of the surrounding reactor chamber 5, the pipe group 26, and the like. When the device is set up, the turning operation and the traveling movement are alternately repeated two or three times.

When removing the internal pump motor 7 from the internal pump 14, the above operation may be performed in reverse order.

In the above-described embodiment, the internal pump motor 7 is mounted on the transport carriage 30 via the motor container support pins 19, and a pair of connection driving devices 35 are mounted from both sides.
The polygonal portion 19b at the tip of the motor container support pin 19
And the polygonal groove 40b of the connection shaft 40, and
The case where the internal pump motor 7 is set up vertically by rotating the manual handle 41a constituting the 36 has been described. However, an electric motor may be used instead of the manual handle 41a, and as shown in FIG. Instead of the manual roll drive 36, the drive is substantially the same as that of the truck 31A.
16 and a support frame 55 on a trolley 31B provided with an on-site operation box 17 (not shown) and the like, and the above-mentioned motor container support pin 19 is not provided on the L-shaped frame 56 rotatably supported by the support frame 55. Motor container 18B
The internal pump motor 7 housed in the housing is directly fixed by bolts 57 using holes provided in the flange portion. Thus, the L-shaped frame 56 may be driven to rotate by the electric cylinder 58 (or a hydraulic cylinder), and finally, the internal pump motor 7 may be vertically set for each L-shaped frame 56.

[0029]

As described above, according to the present invention, a polygonal first engaging portion is provided at an end of a shaft member provided in a transport container accommodating an internal pump, and the first engaging portion is provided. A coupling drive device having a second engagement portion of a polygonal concave portion that can be inserted into and removed from the engagement portion, and a rollover drive device connected to the coupling drive device via a torque transmission mechanism are mounted on a bogie. Because the internal pump motor, which is long and heavy, is mounted on the transport trolley without using a lifting device such as an electric chain block, the internal pump The motor can be changed from a horizontal state to a vertical state, or vice versa, so that it is not necessary to move the transport trolley, and the space inside the narrow and confined space below the reactor pressure vessel is reduced. Also sufficiently possible to correspond, safe work, and can be performed in a short period of time, yet able to provide a conveying carriage of the internal pump motor which attained labor saving.

[Brief description of the drawings]

FIG. 1 is a front view showing the configuration of an embodiment of the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a side view partially cut along the line XXXX of FIG. 1;

FIG. 4 is a sectional view of an essential part taken along line YY of FIG. 1;

FIG. 5 is a front view showing a transport state of the stretch tube nut handling tool according to the embodiment of the present invention.

FIG. 6 is a front view showing a transport state of the secondary seal handling tool in one embodiment of the present invention.

FIG. 7 is a front view showing another embodiment of the present invention.

FIG. 8 is a partial front view showing the configuration of the lower part of the boiling water reactor provided with the internal pump related to the present invention.

FIG. 9 is a plan view along the line ZZ in FIG. 8;

FIG. 10 is a sectional view showing a general configuration of an internal pump related to the present invention.

FIG. 11 is a front view showing a configuration of a conventional carriage for an internal pump motor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Reactor pressure vessel, 3 ... Motor casing, 5 ... Reactor room, 6 ... Equipment entrance, 7 ... Internal pump motor, 8 ... Electric chain block, 9 ... Swirl platform, 10 ... Elevating device, 12 ... Atom Outside the furnace chamber, 13a, 13b: rails for transport carts, 14: internal pumps, 16: drive units,
17 ... field operation box, 18A, 18B ... motor container, 19 ... motor container support pin, 19b ... polygonal part, 25 ... hanging ear, 31A, 31B ... trolley, 32 ... mounting part, 35 ... coupling drive, 36 ... Rollover drive device, 39, 44 ... sprocket, 40 ... connecting shaft, 40 b ... polygonal groove, 41 ... worm reduction mechanism, 41 a
… Manual handle, 45… Chain, 48… Stretch tube nut handling tool, 49… Secondary seal handling tool, 52… Stretch tube nut handling tool container, 53… Secondary seal handling tool container, 56… L-shaped frame, 58… Electric cylinder.

Continuation of the front page (72) Inventor Hideo Sato 1 Toshiba-cho, Fuchu-shi, Tokyo Toshiba Corporation Fuchu Plant (58) Field surveyed (Int. Cl. ⁷ , DB name) G21C 15/243 G21C 19/02

Claims (1)

(57) [Claims] 1. An internal pump motor for accommodating and inspecting an internal pump motor of an internal pump disposed at a lower portion of a reactor pressure vessel. In a carrier truck of an internal pump motor which is rotatably mounted on a carrier via a member and travels between the reactor chamber and the outside of the reactor chamber to carry the carrier, a first end is provided at an end of the shaft member. And a coupling drive device having a second engagement portion that can be inserted into and removed from the first engagement portion, and a rollover coupled to the coupling drive device via a torque transmission mechanism. A carriage for an internal pump motor, wherein a drive device is mounted on the carriage.