JPH0684996B2 - Control rod drive replacement method and device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a control rod drive (hereinafter referred to as CRD) exchanging device, and in particular, the time required for disassembling and inspecting the CRD and carrying the CRD is removed from the critical period. The present invention relates to a CRD exchanging device equipped with a CRD storage device and a CRD exchanging method using the same, which is suitable for shortening an inspection period.

[Conventional technology]

The CRD is installed via the CRD housing in the lower part of the reactor pressure vessel in order to drive the control rod that controls the output of the boiling water reactor by pulling out and inserting the control rod. It has been removed and is being disassembled for inspection.

Such a series of operations from removal to installation of the CRD requires a large number of workers and is also exposed to a large amount of radiation, so automation has been promoted in the past. Conventionally, as this type of apparatus, there is one described in JP-A-55-352923. This conventional technique will be described below with reference to FIGS. 10 to 14.

In FIG. 10, reference numeral 1 is a reactor pressure vessel, and the reactor pressure vessel 1 is installed on a pedestal 3 arranged in a containment vessel 2 (hereinafter referred to as PCV). A CRD housing 4 and a neutron flux measurement housing 5 are provided so as to project below the reactor pressure vessel 1.
Form a part of. The DRD 6 is housed in the CRD housing 4. A lower chamber 7 is formed in the pedestal 3 below the reactor pressure vessel 1, and the pedestal 3 is provided with a carry-in / out port 8 for loading / unloading the CRD 6 into / from the lower chamber 7. A bracket 9 projects from the side wall of the lower chamber 7, and an annular rail 10 is laid on top of the bracket 9. 11
Is a platform and swings on rail 10.

Reference numeral 12 is a CRD exchanging device including a platform 11, a CRD attaching / detaching device 13 and a CRD handling device 14. CRD attaching / detaching device 13
Consists of a traveling carriage 15 and a removable head 16, and the CRD
The mounting bolts can be attached and detached, and the control rod and CRD6 can be attached and detached.

The CRD handling device 14 is composed of a traveling carriage 17 and a mast 18, and has functions of receiving, delivering and rolling over the CRD 6 removed by the CRD attaching / detaching device 13. The CRD 6 overturned by the CRD handling device 14 is held and loaded on the CRD transport cart 19 and is carried out from the carry-in / out port 8 of the pedestal 3 through the bridge 20 and from the through-hole 21 of the reactor containment vessel 2.

Hereinafter, a conventional CRD exchange procedure will be described in detail with reference to FIGS. 10 to 14. FIG. 1 to FIG. 14 are a series of operation explanatory diagrams from the removal of the CRD 6 to the overturn.

FIG. 10 shows a state in which the platform 11 and the traveling carriage 15 of the CRD attaching / detaching device 13 are driven to complete the alignment of the attaching / detaching head 16 with the CRD 6 to be replaced. CR from this position
D The attachment / detachment head 16 is raised by the lifting drive mechanism of the attachment / detachment device 13 and connected to the lower part of the CRD 6.

Fig. 11 shows the state in which the detachable head 16 is connected to the lower part of the CRD6.From this state, the control rod and the uncoupling of the CRD6, which are the functions of the CRD detachable device 13, and their confirmation, drain processing, and CRD mounting The ind bolt is removed, the CRD 6 stored in the CRD housing 4 is removed, and the CRD attachment / detachment head 16 is lowered. Next, the CRD handling device 14
CRD6 by driving the traveling carriage 17 of
Hand over to the RD handling device 14.

FIG. 12 shows the state where CRD6 is being delivered. In this state, the CRD 6 has not been completely extracted from the CRD housing 4. With the lifting mechanism of the CRD handling device 14, the first
3 Lower the CRD6 to the position shown in the figure and complete the complete withdrawal.

FIG. 13 shows a state in which the CRD6 is completely withdrawn, and after the CRD6 is delivered, the CRD attaching / detaching device 13 avoids interference when the CRD6 descends and rolls over, as shown in FIG.
Move it back to the inner wall.

Next, as shown in FIG. 14, the roll mechanism of the CRD handling device rolls the roll to a predetermined angle, and the turning movement device 11 turns it to the position of the carry-in / out port 8 provided in the pedestal 3. And at the position where the CRD6 and the loading / unloading entrance 8 match,
With the mast 18 in the horizontal position, the CRD 6 is loaded on the CRD transport cart 19 and then unloaded.

This completes the series of operations for removing CRD6. Installation is carried out in the reverse order of the above-mentioned removal work.

[Problems to be solved by the invention]

In the above CRD exchange device and a series of exchange methods, C
When moving nuclear fuel before the RD replacement work, the preceding work in the reactor pressure vessel lower chamber cannot be performed. For this reason, a spare CRD
However, even if the time required for overhaul and inspection is reduced by preparing, it is not possible to expect a substantial reduction in the regular inspection period. In addition, it is necessary to transport the CRD from the storage room until it is installed in the CRD housing, and transport it over a long distance and load the CRD several times. There were problems such as being in the club.

In other words, the above-mentioned conventional technology requires the time and C
No consideration was given to removing the time required to transport the RD from the CRD storage room to the reactor pressure vessel lower room from the critical process of the entire regular inspection. And the time required to transport the CRD from the CRD storage room to the reactor pressure vessel lower room.
There was a problem that it took days.

In view of the above, an object of the present invention is to replace a control rod drive device and a replacement device, by which the time for disassembling and inspecting CRD and the time for transportation can be removed from the critical, and the regular inspection period can be greatly shortened. To provide.

[Means for solving problems]

The purpose of the above is to remove the time required for CRD disassembly inspection and transportation from the critical, so during the transfer of nuclear fuel before the CRD replacement, the CRD of disassembly inspection was carried to the storage device installed in the lower chamber of the reactor pressure vessel, CRD replacement (installation, removal)
With the storage device of this CRD, and after exchanging this CRD,
For example, during the nuclear fuel replacement shuffling, remove the CRD that was removed and stored in the storage device from the lower chamber of the reactor pressure vessel to the external CRD.
Achieved by transporting to storage room.

As for the device configuration, the above object can be achieved by providing a device capable of storing the attached CRD and the removed CRD at one time in the reactor pressure vessel lower chamber.

[Action]

By installing a CRD storage device in the lower chamber of the reactor pressure vessel, the CRD replacement period can be shortened by the procedure described below.

During the transfer of nuclear fuel, the CRD that has been disassembled and checked is carried and stored in the CRD storage device in the lower chamber of the nuclear pressure vessel.

Immediately after the transfer of nuclear fuel is completed, the CRD is removed, the removed CRD is put into the empty space of the CRD storage device, the next stored CRD is taken out from the storage device, and the CRD is removed.
D Attach to housing. This work is repeated to complete the replacement work.

After this, since it comes off from the critical, the CRD stored in the free state from the reactor pressure vessel lower chamber,
Carry it out and complete the disassembly and inspection before the next regular inspection in the CRD storage room. By the above procedure, it is possible to greatly shorten the replacement period of the CRD that is the critical in the regular inspection process of a nuclear power plant.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 9. Descriptions of parts common to those in FIGS. 10 to 14 will be omitted.

FIG. 1 shows an overall schematic view of the CRD exchange device of the present invention. A CRD storage device 32 and a rotation base 33 for rotating the CRD storage device 32 are installed along the circumference of the inner wall surface of the lower chamber 7 of the reactor pressure vessel. A rack is mounted on the lower portion of the CRD storage device 32 and is connected to the gear of the rotating device 34 to rotate the CRD storage device 32 to the instructed position. Also, CRD storage device 3
A CRD protective cover 35 that prevents contamination of CRD6 is installed on the outside of 2. Since the CRD protection cover 35 is made of a transparent material, the storage status of the CRD 6 can be checked at a glance.

The bracket 9 is provided on the CRD protective cover 35,
An annular rail 10 is laid on top of the bracket 9.
The bracket 9 and the rail 10 are moved upward from the conventional position. The reference numeral 22 designates a suspension type platform, and the platform height from the bottom is the same as that of the conventional platform, and it swings on the rail 10. The bracket 9 and the rail 10 are raised above in order to save the space for storing the CRD6.
This is for facilitating storage of D6 in the storage device 32 by the CRD handling device 30. Therefore, if the lower chamber is deeply formed and the downward movable range of the CRD handling device is increased, the platform need not be suspended. From the current equipment, this hanging platform is effective.

The CRD replacement device includes a suspended platform 22, a CRD operation unit (CRD attachment / detachment device 24 and CRD handling device 30), and a traveling carriage.
It consists of 31.

The CRD attaching / detaching device 24 of the CRD operating portion is composed of the attaching / detaching head 16 and the head moving device 23, and its functions are the same as those of the conventional ones such as attaching / detaching the CRD mounting bolt, attaching / removing the control rod and the CRD6.

The CRD handling device 30 of the CRD operation unit is a CRD holding device 25 (A, B),
Composed of CRD flange support device 28 and mast 29, CRD
At the tip of the holding device 25 (A, B), the CRD gripping device 26 and the opening claw 27 for opening and closing the CRD storage of the CRD storage device 32 are attached, and the CRD 6 of the CRD 6 removed by the CRD attaching / detaching device 24 is attached. Hold and deliver. The CRD holding device 25 (upper and lower two sets) and the CRD flange support device 28 are fixed to the mast 29.
The attachment / detachment device 24 is structured to move up and down along the guide shaft of the mast 29. Therefore, since the CRD6 is received as in the conventional case, the operation of moving the mast to the CRD attaching / detaching device is unnecessary.

The traveling carriage platform 31 has a function of traveling through the opening (see FIG. 8) of the hanging platform 22 and rolling over the mast 29 of the CRD handling device 30 while supporting the CRD handling device 30. . The lower frame of the overturned mast 29 is structured so that the CRD transport cart 19 can be placed on it (see Fig. 9). With the mast 29 horizontal, pull in the CRD transport cart 19 and handle the CRD. The CRD 6 is loaded and unloaded by the device 30.

The method of taking in and out the CRD carrying cart 19 from the carry-out port 8 of the pedestal 3 is the same as the conventional method.

The CR according to this embodiment will be described below with reference to FIGS. 2 to 9.
The replacement procedure of D will be described in detail. 2 to 7
The figure is a series of operation explanatory views from the removal of the CRD 6 to the overturn.

FIG. 1 shows a state in which the suspension type platform 22 and the traveling movable carriage 31 are driven, and the attachment / detachment head 16 is completely aligned with the CRD 6 to be replaced. From this position, the CRD is shown.
The head moving device 23 of the attachment / detachment device 24 raises the attachment / detachment head 16 to connect it to the lower part of the CRD 6.

Fig. 2 shows the state where the detachable head 16 is connected to the lower part of the CRD 6, and in this state, the control rod and
Uncoupling of CRD6 and its confirmation, drain processing, removal of CRD mounting bolts, driving head moving device 23 downward, and starting to extract CRD6 from CRD housing 4.

FIG. 3 shows a state in which the head of CRD6 descends and the head is in the middle position. The detachable head 16 has a CRD holding device 2 on the top.
After passing the 5A position, the CRD gripping device 26 automatically
Supports the outer cylinder (outer tube) of 6.

The operation of the CRD gripping device 26 will be described in detail with reference to FIG.

FIG. 4 shows the CRD6 fully pulled out. In the CRD6, the flange portion of the head is supported by the CRD flange support device 28, and the upper and lower two positions of the outer cylinder (outer tube) are CRd.
D gripping device 26 supports. Further, the head moving device 23 of the CRD attaching / detaching device 24, when descending to the lowermost end of the mast 29, the built-in pinion meshes with the gear at the lowermost end of the guide shaft of the mast 29, centering on the guide shaft of the mast 29, The entire CRD attaching / detaching device 24 is designed to rotate 180 °. That is, CRD
CRD attach / detach device 24 to facilitate insertion of 6 into storage device 32
To be retracted behind the CRD handling device 30.

FIG. 5 shows a state in which the CRD6 is delivered to the CRD storage device 32, and the CRD6 is supported by the traveling mobile carriage 31 and the CRD6 is supported.
D Move the handling device 30 to the CRD storage device 32 side, align the flange support of the CRD flange support device 28 with the CRD storage device 32, and
Lower the entire RD6 and position it.

With the opening claw 27 at the tip of the CRD holding device 25, the CRD storage device 32
Open CRD holding and hold CRD6 at the same time
Hold the gripping device 26 and the CRD flange support device 28 as a CRD storage device.
The CRD 6 is inserted into the device 32, and the opening claw 27 is pulled in the state where the CRD 6 is put in. Then, the CRD grip device 26 and the CRD flange support device 28 are opened and pulled to complete the storage of the CRD 6. The removal of CRD6 is the reverse of this procedure.

6 and 7 show a procedure for taking out the CRD 6 from the CRD storage device 32 and carrying it out from the reactor pressure vessel lower chamber 7.

FIG. 6 shows a state in which the CRD 6 is taken out from the CRD storage device 32 and is moved to a position where it does not interfere with the CRD storage device 32 when the traveling mobile carriage 31 rolls over the entire CRD handling device 30.

The position at which the CRD 6 is taken out from the CRD storage device 32 is fixed directly opposite the carry-in / out port 8 of the pedestal 3. The reason why the position for taking out the cartridge 8 is determined in this way is that the CRD 6 can be taken out from the door 8 without turning the platform by turning the mast sideways as described later. In addition, when the CRD handling device 30 is overturned and when the CRD transport cart 19 moves in and out, the carry-in / out port 8
The CRD storage device 32 rotates so that the portion of the CRD storage device 32 where the CRD 6 does not have a storage is always located at the position facing (for example, the position shown in FIG. 8). This is because the platform 22 is suspended so that the loading / unloading port 8
If the CRD6 is stored in a location facing the front, the CRD handling device and the CRD6 will interfere when the mast is overturned, and if the cart 19 goes in and out, the CRD6 will block the entrance and exit of the cart. Is.

The seventh shows a state in which the mast 29 is made horizontal by the rollover mechanism of the traveling mobile carriage 31. Since the take-out position of the CRD 6 of the CRD storage device 32 and the carry-in / out port 8 are opposed to each other, it is inevitable that the platform 22 does not need to be rotated and aligned as in the conventional case. Therefore, CR
The time required to roll over when loading and unloading D6 is shortened.

After leveling the mast 29, the cart 19 for CRD transportation is put in, and the CRD 6 is loaded and unloaded by the CRD handling device 30.

FIG. 8 shows a plan view of an embodiment of a CRD storage device 32 and a hanging platform 22 according to the present invention. CRD storage device 32
Is installed along the circumference of the inner wall surface of the pedestal 3, and CR
Storage boxes for storing D6 are arranged at equal intervals. However,
As described above, the storage of the CRD 6 is not located on the surface of the loading / unloading port 8 of the pedestal 3 when the mast rolls over. The number of storages is 1/5 of the total number of CRD6 + the number of spares.

The CRD storage device 32 is equipped with a CRD protective cover 35 to prevent contamination over the entire surface.
The structure is such that only the delivery part of CRD6 can be removed (opening and closing).

A rotating device 34 is installed to align the designated CRD storage box with the CRD delivery position directly facing the loading / unloading port 8. After the completion of delivery of the CRD 6, the rotating device 34 automatically rotates the storage device to the arrangement shown in FIG. 8 to open the surface of the carry-in / out port 8 and set for the next operation.

The operation of the suspension type platform 22 is carried out in the same manner as in the conventional case, and the positioning with the CRD housing 6 is carried out by turning and traveling of the traveling carriage 31.

FIG. 9 shows an embodiment and storage procedure of the CRD storage box 37, opening claw 27, and CRD gripping device 26 of the CRD storage device 33 according to the present invention.

When storing the CRD6 in the storage case 37 of the CRD storage device 32, first open the storage case 37 with the opening claw 27 and then expand it with the CRD gripping device 26.
With the RD6 held, the CRD6 is inserted, the CRD gripping device 26 is left as it is, and the opening claw 27 is pulled back. afterwards,
Open the CRD gripping device 26 and pull it back. When taking out the CRD from the storage 37, the reverse procedure is performed. CRD gripping device 26
Since the air cylinder 38 is used for the pulling-out and pulling-back operation of the opening claw 27, the CRD can be reliably stored and taken out.

The virtual line in the figure shows the mast 29 horizontal and CR on the frame.
A schematic positional relationship when the D transport cart 19 is placed is shown (in this case, naturally, the CRD storage device 32 on the left side of the drawing is not facing the mast). As shown by the phantom line in the figure, the CRD gripping device 26 is used to load the CRD6 into the CRD transport cart 19
Can be loaded remotely. With conventional technology, CRD6
The CRD transport cart 19 cannot be carried out of the lower chamber of the reactor pressure vessel (because it is loaded in the CRD handling device) until a series of work for mounting or removing the CRD is completed. In the embodiment, there is also an advantage that the CRD carrying cart 19 can be carried out for carrying in the next CRD after the delivery to the CRD handling device 30 is completed.

According to the embodiment of the present invention described above, the CRD replacement work constitutes 1) CRD removal and installation work 2) CRD transportation 3) CRD overhaul and inspection. "Disassembly inspection" can be removed from the critical of the regular inspection process of a nuclear power plant,
Further, since the CRD exchange procedure is simplified without reloading CRDs, the number of CRD exchange days can be shortened as follows compared to the conventional case.

That is, as shown in Fig. 15 and Fig. 16, the number of days to enter the critical part for all CRD exchanges is reduced from 12 days to 4 days and 8 days, so even for the entire regular inspection period of the nuclear power plant, It is possible to obtain a great effect that the time is shortened to 8 days.

As the CRD exchange method using the above-mentioned CRD storage device 32, the following CRD exchange method is also possible in addition to the above.

That is, the CRD that has been disassembled and inspected is not stored in the CRD storage device 32 in advance, but the CRD that has been disassembled and inspected is loaded on the CRD transport cart 19 and placed in the carry-in / out port 8 to be replaced. First, remove the CRD with the CRD attaching / detaching device 24.
After handing over the CRD6 to the handling device 30, the removed CRD6 is stored in the storage device. After that, load the CRD handling device 30 into the loading / unloading port 8
Up to move the platform 22, etc. At this time, the storage device is rotated so that the CRD storage portion is not located on the surface of the carry-in / out port 8. And a CRD transport cart loaded with the CRD that has been disassembled and inspected that was waiting at the loading / unloading entrance 8.
Delivered and disassembled CRD from 19 to CRD handling device 30. After this, after moving the CRD handling device 30 to the CRD mounting position,
It is delivered to the CRD attaching / detaching device 24 and attached to the CRD housing by the CRD attaching / detaching device 24. During this installation work, the CRD transport cart 19 has been disassembled and inspected.
Transport the RD from the inspection room to the loading / unloading port 8 and put it on standby. These operations are repeated to complete the CRD exchange operation. Then, the CRD that has been removed and stored in the storage device 32 is carried out from the reactor pressure or the lower chamber 7 of the reactor in the same manner as in the above-described embodiment. Even with such a replacement method, the time required for the replacement work can be shortened as compared with the conventional method.

Further, although the CRD storage device is rotated in the above-described embodiment, the space of the reactor pressure vessel lower chamber 7 can be made sufficiently wide, and the CRD attaching / detaching device 24 and the CRD handling device 30 can be used. The operation part is another device, especially the CRD storage device.
The CRD storage device 30 may be fixed and provided if it can avoid interference with the CRD storage device 30. However, when the space cannot be taken sufficiently, the rotation method of the storage device is effective, and in the case of the rotation method, as in the above-described embodiment, only the mast 29 is overturned to the CRD.
There are many advantages such as allowing the CRD handling device 30 to face the loading / unloading port 8.

Although not related to the CRD exchange device, there is an example of the nuclear fuel exchange method in the nuclear field in which the nuclear fuel is temporarily stored at a predetermined location. For example, as described in Japanese Patent Application Laid-Open No. 60-93392, a device for holding nuclear fuel in the upper part of the core is provided, and two nuclear fuel exchangers are used,
This is a method of exchanging nuclear fuel at high speed using a holding device as a relay point. However, this method uses the holding device merely as a relay point for the nuclear fuel transfer, and like the present invention,
It is not based on the idea of preliminarily storing a plurality of objects to be exchanged and excluding the substantial exchange time from the critical process. Therefore, the conventional exchange method cannot significantly reduce the CRD exchange time as in the present invention. Also, for the fuel exchange method of the fast breeder reactor,
Similar to the above-mentioned JP-A No. 60-93392 (for example,
Japanese Patent Laid-Open No. 59-32893), but this method does not have the idea of storing a plurality of objects to be exchanged as in the nuclear fuel exchange method described above.

〔The invention's effect〕

According to the present invention, the CRD for replacement is carried in and stored in the lower chamber of the reactor pressure vessel during the transfer of nuclear fuel, which was conventionally impossible for the CRD replacement work, and the CRD replacement work after the completion of the transfer of the nuclear fuel is carried in and out. Since the CRD can be removed and installed continuously without doing so, the CRD replacement work can be completed in a short period of time. Further, since the CRD transportation and overhaul inspection work can be removed from the critical process, there is an effect that the regular inspection is greatly shortened and the operation rate of the nuclear power plant is improved.

[Brief description of drawings]

FIG. 1 is an overall schematic view of a CRD exchanging device of the present invention, FIGS. 2 to 7 are explanatory views of a procedure of CRD exchanging work of the CRD exchanging device of the present invention, and FIG. 8 is a CRD exchanging device of the present invention. Top view of the ninth
FIG. 10 is a sectional view showing an embodiment of storing and taking out CRD from a storage device of a CRD exchanging device of the present invention, FIG. 10 is an overall schematic view of a conventional CRD exchanging device, and FIGS. Illustrated in the figure
CRD replacement device CRD replacement procedure explanation diagram, Figure 15 is a diagram showing the relationship between the conventional CRD replacement time and total replacement days,
FIG. 16 is a diagram showing the relationship between the replacement time per CRD and the total number of replacement days according to the present invention. 4 ... CRD housing, 6 ... CRD, 10 ... rails, 11 ...
… Platform, 12 …… CRD exchange device, 13 …… CRD attachment / detachment device, 14 …… CRD handling device, 15 …… Truck carriage, 16 …… Removal head, 17 …… Truck carriage, 18 …… Mast, 19 …… CRD
Transport carts, 22 ... Hanging platform, 23 ...
… Head moving device, 24 …… CRD attaching / detaching device, 25 …… CRD holding device, 26 …… CRD gripping device, 27 …… Opening claw, 28 …… CRD flange supporting device, 29 …… Mast, 30 …… CRD Handling device, 3
1 …… Traveling mobile cart, 32 …… CRD storage device, 33 …… Rotation base, 34 …… Rotation device, 35 …… CRD protection cover.

Claims (6)

[Claims] 1. A control rod having a step of attaching or detaching a control rod drive device to or from a reactor pressure vessel and a step of loading or unloading the attached or removed control rod drive device into or out of a lower chamber of a reactor pressure vessel. In the method of exchanging the drive unit, control rod drives are installed in the lower chamber of the reactor pressure vessel from outside the lower chamber of the reactor pressure vessel to install multiple control rod drive units to be attached to the reactor pressure vessel while moving the nuclear fuel. After loading and storing the control rod drive unit in the storage device, and removing the control rod drive unit from the reactor pressure vessel after the nuclear fuel transfer work is completed, the work to store the removed control rod drive unit in the storage unit and the reactor pressure Take out the control rod drive device that was loaded and stored in the storage device from outside the lower part of the container and attach it to the reactor pressure vessel. During the work of the fine removal, replacing the control rod drive, characterized in that for unloading a plurality of control rod drive which is accommodated in the storage device into the reactor pressure vessel bottom outside. 2. A control rod comprising a step of attaching or detaching a control rod drive device to or from a reactor pressure vessel, and a step of loading or unloading the attached or removed control rod drive device into or out of a lower chamber of a reactor pressure vessel. In the method of exchanging the drive unit, a plurality of control rod drive units to be attached to the reactor pressure vessel are loaded into and stored from outside the reactor pressure vessel lower chamber in a control rod drive unit storage unit provided in the reactor pressure vessel lower chamber. After the carrying-in and storing work is completed, the work of removing the control rod drive unit from the reactor pressure vessel and storing the removed control rod drive unit in the storage device, and the loading and storing of the control rod drive unit from outside the reactor pressure vessel lower part to the storage unit Remove the control rod drive unit from the storage device and attach it to the reactor pressure vessel. Replacing of the control rod drive, characterized in that unloading the paid by a plurality of control rod drive into the reactor pressure vessel bottom outside. 3. A rotating platform provided at a lower portion of the reactor pressure vessel, and a control rod driving device operating section moving on the platform, wherein the control rod driving device is attached to the reactor pressure vessel or A control rod drive attachment / detachment device for removing the control rod drive device; a control rod drive device operation unit having a control rod drive device handling device for transferring and rolling the attached or removed control rod drive device in the lower chamber of the reactor pressure vessel; In a control rod drive device exchange device having a control rod drive device loading / unloading device for loading / unloading a control rod driving device, which is attached or detached by a control rod driving device operating section, into / out of a lower chamber of a reactor pressure vessel, A control rod driving device storage device that transfers a control rod driving device to and from the control rod driving device operating unit and stores a plurality of control rod driving devices. Changer control rod driving apparatus is characterized by providing a child reactor pressure vessel bottom chamber. 4. A control rod drive attachment / detachment device for attaching / detaching a control rod drive device to / from a reactor pressure vessel, and supporting and moving the attachment / detachment device, and further supporting the control rod drive device attached or detached. A mast having a handling device for delivering and receiving, and a traveling moving device for moving and rolling the mast,
In order to temporarily store the platform for swiveling and moving in the lower chamber of the reactor pressure vessel and the control rod drive device attached or detached in the lower chamber of the reactor pressure vessel by incorporating the traveling device, A control rod drive replacement device that has a storage device that can be remotely rotated in the lower chamber. 5. A rotating platform provided in the lower part of the reactor pressure vessel, and a control rod drive unit operating section moving on the platform, wherein the control rod drive unit is attached to the reactor pressure vessel or A control rod drive attachment / detachment device for removing the control rod drive device; a control rod drive device operation unit having a control rod drive device handling device for transferring and rolling the attached or removed control rod drive device in the lower chamber of the reactor pressure vessel; In a control rod drive device exchange device having a control rod drive device loading / unloading device for loading / unloading a control rod driving device, which is attached or detached by a control rod driving device operating section, into / out of a lower chamber of a reactor pressure vessel, The control rod driving device is transferred to and from the control rod driving device operating unit, and more control rod driving devices than the number of control rod driving devices to be replaced are driven. Changer control rod driving apparatus is characterized in that provided along connexion rotatably moved to the reactor pressure vessel lower chamber wall Puratsutohomu lower the control rod drive storage device capable of storing the location. 6. A platform which is provided at the lower part of the reactor pressure vessel and which swivels, a traveling device which moves on the platform, and a mast which is loaded on the traveling device and overturned by the traveling device. A control rod drive attachment / detachment device attached to the mast, moving along a guide shaft of the mast, and attaching / detaching the control rod drive device to / from the reactor pressure vessel; and an attachment / detachment device attached to the mast. Alternatively, between the handling device for supporting and delivering the removed control rod drive device and the handling device for the control rod drive device, which is rotatably provided along the wall of the lower chamber of the reactor pressure vessel under the platform. Control rod drive devices can be delivered and received, and more control rod drive devices can be stored than the number of control rod drive devices to be replaced. Changer control rod drive having a braking system storage device.