JPS6262317B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control rod drive device exchange device, and in particular to a CRD exchange device that allows smooth up and down movement of CRD attachment/detachment means even when the control rod drive device (hereinafter referred to as CRD) is under load. It is related to the device.

CRD replacement work is performed when the reactor is shut down. This replacement work will be carried out in an environment with high radioactivity levels. In order to reduce the risk of radiation exposure for workers, the
A CRD exchange device has been proposed. The outline of this CRD exchange device will be explained based on FIG. 1.

A reactor pressure vessel 1 is installed on a pedestal 2 located within a containment vessel (not shown). A CRD housing 3 and a neutron flux measuring instrument housing 4 are provided in a protruding manner at the bottom of the reactor pressure vessel 1 . The CRD housing 3 and the neutron flux measuring instrument housing 4 also form part of the reactor pressure vessel 1 . The CRD 5 is housed within the CRD housing 4. Reactor pressure vessel 1 inside pedestal 2
A space 6 is formed below. The loading/unloading entrance 9 for loading and unloading the CRD into the space 6 is located at the pedestal 2.
established in Within the space 6, a bracket 7 is provided projecting from the side wall of the pedestal 2. An annular rail 8 is installed above the bracket 7. The turning movement device 11 moves on the rails 8.

The CRD exchange device 10 includes a turning movement device 11,
It is composed of a CRD attachment/detachment device 20 and a CRD handling device 83.

As will be described in detail later, the CRD attachment/detachment device 20
is a traveling cart 2 that moves on a turning movement device 11.
1. Consists of a detachable device main body 26. The attachment/detachment device main body 26 has an attachment/detachment head at its upper end in which a connection bolt handling device for attaching and removing the CRD connection bolt that connects the CRD 5 and the CRD housing 3 is disposed, and a lifting device for vertically moving the attachment/detachment head. are doing. A lifting column with a rack is provided in the lower part of the loading/unloading head, with which the pinion of the lifting device meshes.

When the CRD 5 is removed from the CRD housing 3, the CRD 5 is not loaded on the attachment/detachment head when it is raised, but when the CRD 5 is removed and lowered, the CRD 5 is loaded on the attachment/detachment head. Also, when the CRD5 is installed in the CRD housing 3, when the detachable head is raised, the
Although the CRD 5 is loaded, the CRD 5 is not loaded on the attachment/detachment head when the attachment/detachment head is lowered after the CRD 5 is installed. Therefore,
The load applied to the lifting device, especially the pinion, is significantly different when the CRD5 is loaded on the removable head and when it is not loaded. Since the use of oil in the space 6 is restricted, there is no lubrication between the rack and pinion. Therefore, if the CRD 5 is loaded on the attachment/detachment head, the attachment/detachment head cannot move smoothly.

The present invention solves these problems and provides a CRD that allows smooth movement of the CRD attachment/detachment means.
The purpose is to provide a replacement device.

A feature of the present invention is that, in addition to the lifting means for the mounting/detachment head that moves up and down the mounting/detachment head for attaching/detaching the control rod drive device, it engages with a lifting column provided with a rack to lift the lifting column upward. An air cylinder is provided to adjust the load applied between the rack and pinion, and the load applied to the rack and pinion is reduced when the control rod drive device is loaded on the attachment/detachment head.

A preferred embodiment of the present invention will be described below based on the drawings.

The CRD exchange device 10 includes a turning movement device 11,
It consists of a CRD attachment/detachment device 20 and a CRD handling device 83.

The outline of the turning movement device 11 is shown in FIGS. 2 and 3.
As shown in the figure. The drive motor 12 is connected to the turning movement device 11
mounted on. Drive motor 12 is coupled to wheels 13 . Wheels 13 are placed on rails 8. Two frames 15 are provided on the turning movement device 11 to face each other. The guide groove 14 is
Formed between 5 and 5. A traveling guide rail 16 is attached to the lower part of the frame 15. A rail 17 is provided above the traveling guide rail 16 to guide wheels 22 provided on the traveling carriage 21 of the CRD attachment/detachment device 20. Rails 18 that guide the wheels provided on the traveling cart 84 of the CRD handling device 83
is provided at the lower part of the traveling guide rail 16.
A grating 19 is installed on top of the pivot movement device 11 .

The CRD attachment/detachment device 20 is shown in FIGS. 4 and 5. The CRD attachment/detachment device 20 includes a traveling carriage 21, as shown in FIG. Wheels 22 of the traveling truck 21 are placed on the rails 17. Although not shown, a traveling drive device including a motor and a speed reducer is installed on the traveling carriage 21. The motor is connected to the wheels 22 via a speed reducer. The attachment/detachment device main body 26 is attached to the traveling carriage 21.

Although not shown, the attachment/detachment device body 26 of the CRD exchange device attached to the traveling trolley 21 has a connection at the top for attaching and removing a CRD connection bolt, as described in Japanese Patent Application No. 107643/1983. The attachment/detachment head 24 is comprised of a bolt handling device, a cooling water scattering prevention device for recovering leaked water, and an anchor spring device for disconnecting the control rod from the CRD 5, and an elevating device for moving the attachment/detachment head 24 up and down.

Reference numeral 39 in FIG. 4 is a bolt wrench of the connection bolt handling device. Manifold 46 of detachable head 24
An elevating column 63 is attached to the lower part of. Lifting column 63 is inserted into housing 28 . A slide bearing 73 is provided between the housing 28 and the lifting column 63 to allow the lifting column 63 to move up and down smoothly. The casing 71 is
Attached to housing 28. As shown in FIG. 6, a lifting device 65 is housed within the casing 71. The lifting device 65 includes an air motor 66 attached to the casing 71, a worm 67 attached to the rotating shaft of the air motor 66, a worm wheel 68 that meshes with the worm 67, and a worm wheel 68 that is attached to the casing 71 via a bearing 51 and supports the worm wheel 68. It is composed of a rotating shaft 70 and a pinion 69 attached to the rotating shaft 70.
The pinion 69 meshes with a rack 64 provided on the lifting arm 63.

Support sleeves 76 and 79 are arranged to respectively surround the upper and lower ends of housing 28 via bearings. Clip 5
2 and 53 are support sleeves 76 and 7
9 respectively. Clips 52 and 5
3 are support parts 54 and 55 of the traveling trolley 21;
It is removably attached so that it can be hung on each. Although not shown, the clip 52 and the support part 54 and the clip 53 and the support part 5
5 are each fixed with bolts.

A pair of air cylinders 30 are installed at the bottom of the traveling truck 21.
A and 30B are installed. A piston is provided within each air cylinder 30A and 30B. The piston rods 31A and 31B are
It is attached to the piston mentioned above. Pulleys 32A and 32B connect piston rods 31A and 31
They are attached to B respectively. Fixed pulleys 33A and 33B are installed on the traveling trolley 21. A metal fitting 34 is attached to the lower part of the lifting arm 63. Pulleys 35A and 35B are provided within fitting 34. One end of the wire 36 is fixed to a mounting bracket 37A attached to the traveling carriage 21. wire 36
are pulleys 32A, 33A, 35A, 35B, 33
B and 32B are sequentially applied as shown in FIG. The other end of the wire 36 is fixed to a mounting bracket 37B attached to the traveling carriage 21.

As shown in FIG. 1, the CRD handling device 83 is comprised of a traveling truck 84, a mast 91 attached to the traveling truck 84 that can be rolled over, a cart 132 detachably attached to the mast 91, and the like. CRD
The detailed structure of the handling device 83 is shown in Japanese Patent Application No. 107643/1984 (see Japanese Patent Publication No. 35035/1983).

The operation of installing the CRD 5 inside the CRD housing 3 will be described.

As shown in Figure 3 of JP-A-52-140793, the loading/unloading port 9 and the CRD loading/unloading port of the containment vessel are connected by a loading/unloading bridge. The cart 132 loaded with CRD is moved from outside the containment vessel on the loading/unloading bridge, is guided into the space 6 through the loading/unloading entrance 9, and is led to the mast 91 which is horizontally overturned.
installed inside. After that, as shown in Figure 7,
Mast 91 is rotated in the direction of arrow 113 about support shaft 90 by a mast rolling device (not shown). The mast 91 is erected vertically with the cart 132 attached. The turning movement device 11 and the traveling cart 84 are moved, and the CRD 5 loaded on the cart 132 is moved to the CRD to which it is attached.
It is located below the housing 4. Although not shown, the lifter of the cart 132 carrying the CRD 5 rises, and the CRD 5 is partially inserted into the CRD housing 3. The upper part of the CRD 5 is gripped by a CRD gripper 146 provided on the cart 132 to prevent the CRD 5 from falling over. after that,
CRD existing at point B as shown in Figure 7
The attachment/detachment device 26 is moved along the running rail 17 and engaged with the CRD handling device 83, as shown in FIG. At this time, the axis of the detachable head 24 and the axis of the CRD 5 loaded on the cart 132 are aligned. When the lifting column 63 is slightly raised, the CRD 5 is delivered from the CRD handling device 83 onto the loading/unloading head 24. Move the CRD handling device 83 to the position shown in FIG. Lifting column 63
As the CRD 5 is raised, the CRD 5 is gradually inserted into the CRD housing 3. The lifting column 63 is raised as follows. The air motor 66 is driven, and its driving force is transmitted to the pinion 69, causing the pinion 69 to rotate. The rotation of the pinion 69 raises the lifting column 63 on which the rack 64 is mounted. Therefore, the attachment/detachment head 24 rises. Immediately before the CRD 5 is completely inserted into the CRD housing 3, the air motor 66 is stopped to stop the lifting column 63 from rising. CRD5 and CRD
The CRD connecting bolt insertion holes provided in the housing 3 are aligned. After positioning,
The air motor 66 is driven, and the elevating column 63 rises again. When the CRD 5 is completely inserted into the CRD housing 3, the lifting column 63 is stopped. The CRD connection bolt is rotated using the bolt wrench 39, and the CRD 5 and the CRD housing are fixed. In order to smoothly raise the lifting column 63, pressurized air is supplied to the space above the pistons in the pistons 30A and 30B when the lifting column 63 is raised. Piston rod 31A
and 31B are pushed down, and pulleys 32A and 32B are pushed down at the same time.
Therefore, the lifting column 63 is pushed upward via the wire 36. The load applied to the lifting column 63 is transferred to the air cylinder 3 via the wire 36.
Since the load can be transmitted to 0A and 30B, the load applied between the rack 64 and the pinion 69 can be almost completely eliminated. Therefore, even if there is no lubrication between the rack 64 and the pinion 69, the lifting column 63 can be raised smoothly without damaging the rack 64 and the pinion 69.

After installing CRD5 into CRD housing 3,
The elevating column 63 is lowered and the detachable head 24 is lowered. In this case, the load applied between the rack 64 and the pinion 69 is only the weight of the detachable head 24 and the like. The air pressure in the air cylinders 30A and 30B is adjusted so that the pressure of the pressurized air in the air cylinders 30A and 30B is reduced and no load is applied between the rack 64 and the pinion 69.

In this way, air cylinders 30A and 30B
A plurality of pulleys and wires 36 are provided to control the air cylinder 30 depending on when the CRD 5 is loaded on the detachable head 24 and when it is not loaded.
By adjusting the air pressure in A and 30B, the load applied between rack 64 and pinion 69 can always be kept in an unloaded state. Therefore, even in the absence of lubrication, the vertical movement of the elevating column 63 is smooth, and the vertical movement of the attachment/detachment head 24 is smooth.

Even when removing the CRD 5 from inside the CRD housing 3, the CRD 5 must be placed on the detachable head 24.
In the same way as described above, the pressure of the pressurized air in the air cylinders 30A and 30B is changed when the detachable head 24 is raised when no CRD is loaded, and when the detachable head 24 is lowered when a CRD is loaded on the detachable head 24. The load applied between the rack 64 and the pinion 69 is brought to an unloaded state. The pressure in the air cylinders 30A and 30B is adjusted so that it is high when the CRD 5 is loaded on the removable head 24 and low when it is not loaded.

According to the present invention, in addition to the mounting/detachment head elevating means for vertically moving the mounting/detachment head for attaching/detaching the CRD, the rack and pinion can be moved upwardly by engaging with the elevating column provided with the rack and lifting the elevating column upward. Since an air cylinder is provided to adjust the load applied between the rack and the pinion when a CRD is loaded on the mounting/unloading head, the load applied to the rack and pinion can be reduced, and the CRD mounting/dismounting device can be moved smoothly. can.

[Brief explanation of the drawing]

Fig. 1 is a side view of a CRD exchanging device to which the present invention is applied, and Fig. 2 is a CRD exchanging device that is an embodiment of the present invention.
A plan view of the rotating movement device of the exchanger, FIG.
4 is a side view of a CRD attachment/detachment device of a CRD exchange device which is a preferred embodiment of the present invention, FIG. 5 is a view taken in the direction of FIG. 4, and FIG. Figure 7 is a sectional view of the figure, after the cart loaded with CRDs is attached to the mast of the CRD handling equipment.
Figure 8 is an explanatory diagram showing the state in which the mast is erected.
FIG. 2 is an explanatory diagram showing a state in which a CRD is transferred from a CRD handling device to a CRD attachment/detachment device. 1... Reactor pressure vessel, 3... CRD housing, 5... CRD, 10... CRD exchange device, 11
...Rotating movement device, 20...CRD attachment/detaching device, 2
1,84... Traveling trolley, 24... Detachable head, 2
6... Attaching/detaching device main body, 30A, 30B... Air cylinder, 31A, 31B... Piston rod, 3
2A, 32B, 33A, 33B, 35A, 35B
...Pulley, 36...Wire, 63...Elevating column, 83...CRD handling device, 132...Cart.

Claims (1)

[Scope of Claims] 1. A control rod drive device replacement device for attaching a control rod drive device to a nuclear reactor pressure vessel and removing the control rod drive device from the reactor pressure vessel, comprising: a method for installing the control rod drive device; a detachable device main body having a detachable head for detaching; a lifting means for the detachable head comprising a lifting column provided with a rack and connected to the detachable head; a pinion meshing with the rack; and a drive device for the pinion; a traveling carriage that moves on a rotating carriage provided at the bottom of the reactor pressure vessel and holds the lifting means; and a carriage that engages with the lifting column and lifts the lifting column upward, thereby moving between the rack and the pinion. and an air cylinder held on the traveling carriage, the air cylinder adjusting the load applied to the control rod drive unit.