JPS6229760B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control rod drive replacement device, and particularly to a control rod drive replacement device that is easy to maintain and inspect.

[Background of the Invention] The control rod drive device (hereinafter referred to as CRD) installed at the bottom of the reactor pressure vessel is removed from the reactor pressure vessel for maintenance and inspection when a boiling water reactor is shut down. . The lower part of the reactor pressure vessel is an area with high radioactivity levels, and replacing the CRD is not an easy task. CRD exchange equipment has been developed to reduce radiation exposure for workers.

The present applicant has disclosed Japanese Patent Application No. 53-119340 (Japanese Unexamined Patent Publication No. 55-46137) as such a CRD exchange device.
Exchange devices such as those shown in Japanese Patent Application No. 53-107643 (Japanese Unexamined Patent Publication No. 55-35223) and Japanese Patent Application No. 33101-1983 (Japanese Unexamined Patent Publication No. 54-125393) have been previously proposed. That is,
As shown in FIG. 1, a rotation movement device 11 is provided in the space 6 of the pedestal 2 below the reactor pressure vessel 1, and a CRD attachment/detachment device 15 and a CRD handling device 46 are provided.
The rail 1 provided on this rotating moving trolley 11
It is configured to move over 2,13. CRD
The attachment/detachment device 15 and the CRD handling device 46 are configured to be moved independently on the rails 12, 13 by separate traveling carts. CRD attachment/detachment device 15
is the CRD installed at the bottom of reactor pressure vessel 1.
The CRD 5 is attached to the housing 3 and the CRD 5 is removed from the CRD housing 3. The CRD handling device 46 transfers the CRD 5 that is attached to and removed from the CRD housing 3 by the CRD attachment and detachment device 15 to and from the CRD attachment and detachment device 15, and also holds the CRD.
This will cause the CRD to roll over. With such an exchange device, for example, from inside the CRD housing 3
The work to remove the CRD 5 is performed as follows.
That is, the attachment/detachment head 31b of the CRD attachment/detachment device 15 is positioned below the CRD 5. The attachment/detachment head 31b is raised, the bolts fixing the CRD 5 to the CRD housing 3 are removed, and then the attachment/detachment head 31b is lowered. The CRD handling device 46 is engaged with the CRD attachment/detachment device 15, the pulled out CRD 5 is transferred to the CRD handling device 46, and the CRD attachment/detachment device 15 is moved to point A in FIG. Operate the traveling cart and turning movement device 11 of the CRD handling device to move the CRD handling device 46 to a position where it can be rolled over, roll the CRD handling device 46 in the direction of the arrow 60, and carry out the CRD handling device 46.
level it. Rotating the rotation moving device 11
After pointing the top of CRD5 toward the loading/unloading entrance 9,
is moved out of the containment vessel through the loading/unloading port 9.

As mentioned above, by replacing the CRD, the radiation exposure of workers can be reduced.
It is necessary to perform maintenance and inspection not only on the CRD but also on the CRD replacement device itself.

[Object of the Invention] The present invention takes the above requirements into consideration and provides a CRD exchange device that allows easy maintenance and inspection of the CRD exchange device itself.

[Summary of the Invention] A feature of the present invention is that in a CRD exchange device that includes a rotation movement device that performs rotation movement, and a CRD attachment/detachment device and a CRD handling device that move on the rotation movement device, the CRD attachment/detachment device or the CRD handling device is It is divided into those CRD operation parts and a traveling trolley that moves along the rails provided on the swing movement device.
The CRD operating section and the running cart are made removable, and the driving means that has a shaft for rotationally driving the running cart is provided on the CRD operating section, and a rack provided at the bottom of the rail engages and rotates the moving cart. This is done by a pinion that is slidably attached to the shaft that performs the rotation, and an elastic body that presses the pinion from the CRD operating section side to the easy side is attached to the rotating shaft.

The CRD operation section of the CRD attachment/detachment device is used for the main tasks of attaching the CRD to the CRD drive housing and removing the CRD from the CRD housing.

The CRD operating section of the CRD handling device exchanges the CRD that is attached to and removed from the CRD housing with the attachment/detachment device, and
The main task is to overturn the CRD while holding it.

[Embodiment] A CRD exchanging device which is a preferred embodiment of the present invention will be described based on FIGS. 1 to 5.

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 form part of the reactor pressure vessel 1 . The CRD 5 is housed within the CRD housing 3. 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 A bracket 7 is provided within the space 6 and protrudes from the side wall of the pedestal 2. An annular rail 8 is provided above the bracket 7.

The CRD exchange device is composed of a turning movement device 11, a CRD attachment/detachment device 15, and a CRD handling device 46. The turning movement device 11 moves on the rails 8. The rotation movement device 11 includes a CRD attachment/detachment device 15.
Rails 12 and 13 are provided on which the traveling carriage of the CRD handling device 46 and the traveling carriage of the CRD handling device 46 run independently, respectively.

The CRD attachment/detachment device 15 attaches and detaches the CRD 5 to and from the CRD housing 3 provided at the bottom of the reactor pressure vessel 1 .

The CRD attachment/detachment device 15 includes a CRD operation section and this CRD
Traveling trolley 1 that moves the operating section on a turning movement device
Consisting of 6. The CRD operating section is composed of a frame 20, a connecting plate 28, a driving device for the traveling carriage 16, and a main body 31 of the attaching/detaching device, and performs the main work of attaching and detaching the CRD to and from the CRD housing. The structure of this CRD attachment/detachment device 15 is
The explanation will be made based on FIGS. 3, 3, and 4.

Wheels 17 arranged on the rails 12 are attached to the shaft 18 of the traveling carriage 16 (see FIG. 4).
A pair of frames 20 are fixed by a connecting plate 28. A frame 20 is detachably attached to the traveling truck 16. The frame 20 can be removed from the carriage 16 by lifting it. A motor 21 and a speed reducer 22 are attached to the upper end of the connecting plate 28. The motor 21 is connected via a speed reducer 22 to a rotating shaft 23 rotatably attached to a pair of covers 26 attached to a pair of frames 20, respectively. A pinion 25 is attached to both ends of the rotating shaft 23 so as to be slidable in the axial direction of the rotating shaft 23, and the rotational force of the rotating shaft 23 is transmitted to the pinion 25 by a key 24. pinion 25
is engaged with a rack 14 provided at the bottom of the rail 13. The drive device for the traveling carriage 16 is composed of the above-mentioned motor 21, reduction gear 22, rotating shaft 23, and pinion 25. cover 2
A coil spring 27 is arranged within the coil spring 6 . The coil spring 27 presses the pinion 25 from the frame 20 side to the rack 14 side.

The detachable device main body 31 includes a detachable head support member 31.
a and a detachable head 31b. Housing 31 of detachable head support member 31a
A support sleeve 31a2 is provided above a1, and a support sleeve 31a3 is provided below the housing 31a1. Support sleeves 31a2 and 31a3
Clips 31a4 and 31a5 are provided respectively. The clip 31a4 is inserted into a through hole 29 provided in the connecting plate 28 and engaged with the connecting plate 28. The clip 31a5 engages with a notch 30 provided in the connecting plate 28. The detachable head support member 31a is removably fixed to the connecting plate 28 by clips 31a4 and 31a5. Lifting column 31b1 provided at the bottom of the detachable head 31b
is inserted into the housing 31a1. A pinion of a lifting drive device 38 provided in the housing 31a1 meshes with a rack provided in the lifting column 31b1. Although not shown in the upper part of the detachable head 31b, there is a
-35223) A connecting bolt handling device, a cooling water scattering prevention device, and an uncoupling device described in the specification are installed. 31b2 is a bolt wrench of a connecting bolt handling device.

A cylinder 42 into which a piston rod 43 is inserted is provided at the bottom of the frame 20. A metal fitting 44 is provided at the lower end of the lifting column 31b1. A wire 45 fixed at both ends to the frame 20
is attached to the metal fitting 44 via a pulley.

The CRD handling device 46 shown in FIG.
Transferring the CRD 5 to and from the attaching/detaching device 15;
It also allows the CRD to be rolled over while being held.

The CRD handling device is composed of a CRD operating section and a traveling trolley that moves the CRD operating section on a rotating movement device. The CRD operating section of the CRD handling device 46 includes a pair of frames 61 that are arranged facing each other and are connected to each other, and a shaft 4 that is attached to the frame 61.
Mast 48 and mast 48 rotating around 9
It is composed of a cart trolley 50 that is detachably attached to the cart. It is used to transfer the CRD 5 to and from the CRD operating section of the CRD attaching/detaching device 15, and also performs the main work of rolling over the CRD while holding the CRD.

Although not shown, the CRD operating section of the CRD handling device 46 is attached to a traveling truck having wheels arranged on the rails 13, similarly to the CRD attachment/detachment device 15.
Can be detachably attached. The CRD operating section can be removed from the traveling truck by lifting the CRD operating section. Furthermore, the CRD operation section is
As described in Japanese Patent Publication No. 53-107643 (Japanese Patent Application Laid-Open No. 55-35223), it includes a mast overturning device and a traveling drive device. The traveling drive device has the same structure as the drive device for the traveling truck 16, and has a pinion that meshes with the rack 14. The pinion slides along the rotation axis and is pressed toward the rack 14 by a coil spring. The cart trolley is
It has a lifter (not shown) and a CRD gripping device 51.

An example of the operation of the CRD replacement device will be explained by taking as an example the work of removing the CRD 5 from inside the CRD housing 3. The motor 21 is driven to rotate the pinion 25, and the attachment/detachment head 31b of the CRD attachment/detachment device 15 is positioned below the CRD 5. Lifting drive device 3
8 to raise the detachable head 31b,
Engage the bolt wrench with the bolt fixing CRD5 to CRD housing 3. The bolt is removed by the torque wrench 31b2, and the connection between the control rod and the CRD 5 is released by operating the anchor spring device. Lower the attachment/detachment head 31b and pull out the CRD 5 a little to drain the cooling water inside the CRD housing 3. After half of the CRD 5 is pulled out, the CRD handling device 46 is engaged with the CRD attachment/detachment device 15, and the pulled out CRD 5 is transferred onto the lifter of the CRD handling device 46. The CRD attachment/detachment device 15 lowers the attachment/detachment head 31b to the lowest position, and then moves it to point A in FIG. Lower the lifter and CRD
5 completely from the CRD housing 3. A CRD gripping device 51 grips the CRD 5 to prevent it from falling over. The traveling truck and the turning device 11 are operated to move the mast 48 to a position where it can be rolled over. The mast 48 is rolled over in the direction of the arrow 60,
Level CRD5. After turning the turning movement device 11 to point the top of the CRD 5 toward the loading/unloading entrance 9,
Must-4 cart cart 50 with CRD5 on it
Remove from 8. The cart trolley 50 is moved out of the storage container through the carry-in/out entrance 9.

When performing maintenance and inspection on the attachment/detachment device main body 31, use the metal fittings 4.
4 is removed from the lifting column 31b2. special request
As described in the specification of No. 53-119340 (Japanese Unexamined Patent Publication No. 55-46137), the CRD handling device 46 is
The CRD handling device 4 is engaged with the CRD attachment/detachment device 15.
Lifter 6 is raised and the attachment/detachment device main body 31 is moved onto the lifter. Further, the lifter is raised to remove the attachment/detachment device main body 31 from the connection plate 28. After the attachment/detachment device main body 31 is overturned by the operation of the CRD handling device 46, it is carried out from the carry-in/out entrance 9.

When performing maintenance and inspection of the CRD operating section of the CRD attaching/detaching device 15, the CRD operating section of the CRD attaching/detaching device 15 is lifted by a hoist (not shown) provided in the space and removed from the traveling carriage 16. Naturally, the cylinder 42, the metal fittings 44 and the wire 45
is removed from the CRD operating section before lifting the CRD operating section. Furthermore, the CRD operation section is connected to the traveling trolley 16.
When pulling out the pinion 25 from the frame 20, the pinion 25 is pushed toward the frame 20 and inserted into the hole 54 provided in the frame 20. The removal operation of the CRD operation unit will be explained in detail.

The CRD operating portion is lifted until the trapezoidal engaging portion 55 (see FIG. 3) provided on the side surface of the frame 20 is pulled out from the engaging portion provided on the traveling carriage 16. The pinion 25 is connected to the side 5 of the rack 14.
It exists inside of 7. By moving the hoist in the direction of arrow 56, the CRD operating section is easily removed from the traveling carriage 16.

The time required to remove the CRD control unit is reduced, reducing the risk of radiation exposure for workers. Thereafter, the CRD operating section is moved to the outside through the carry-in/out entrance 9. Maintenance and inspection of the CRD operation section becomes easier.

The CRD operating section of the CRD handling device 46 is similarly carried out to the outside through the carry-in/out entrance 9.

During maintenance and inspection of the CRD operation section of the CRD attachment/detachment device 15, first remove the attachment/detachment device main body 31 using the connecting plate 28 and carry it outside using the operations described above, and then
The remaining portion of the CRD operating section may be removed from the traveling trolley 16 and carried outside.

[Effects of the Invention] According to the present invention, maintenance and inspection of a CRD replacement device can be performed easily and in a short time.

[Brief explanation of the drawing]

FIG. 1 is a side view of a CRD exchange device according to a preferred embodiment of the present invention, FIG. 2 is a front view of the CRD attachment/detachment device shown in FIG. 1, and FIG. 3 is a cross-sectional view of FIG.
FIG. 4 is an enlarged view of the vicinity of the pinion in FIG. 2, and FIG. 5 is an explanatory view showing the overturned state of the CRD. 1...Reactor pressure vessel, 3...CRD housing, 5...CRD, 11...Swivel movement device, 14
...Rack, 15...CRD attachment/detachment device, 16...
Traveling trolley, 23... Rotating shaft, 25... Pinion,
27...Coil spring, 46...CRD handling device.

Claims (1)

[Scope of Claims] 1. A rotational movement device that is provided in a pedestal space below the reactor pressure vessel and performs rotational movement; and a control rod drive device for a control rod drive device housing that is provided at the bottom of the reactor pressure vessel. a control rod drive device attachment/detachment device that moves on the swing movement device and has a control rod drive device operating section for attaching the control rod drive device and removing the control rod drive device from the control rod drive device housing; The control rod drive unit has a control rod drive device operation unit that transfers the control rod drive device that is attached to and detached from the control rod drive device housing by the attachment/detachment device between the control rod drive device and the control rod drive device that is capable of overturning the control rod drive device while holding the control rod drive device. and a control rod drive device handling device that moves on the swing movement device, wherein the control rod drive device attachment/detachment device or handling device has a control rod drive device operating section thereof and a control rod drive device handling device that moves on the swing movement device. , the control rod driving device operating section is detachably attached to the traveling truck, which has a plurality of wheels arranged on a rail provided on the swing movement device and is divided into a traveling truck that moves along the rail. and a drive means having a shaft for rotationally driving, which is provided in the control rod drive device operating section, and a shaft that engages with a rack provided at the lower part of the rail to drive the rotationally. and a pinion slidably attached to the control rod drive device, and an elastic body for pressing the pinion from the operating section side of the control rod drive device toward the rack side is attached to the rotationally driven shaft. Exchange device.