JPS6035035B2 - How to replace the control rod drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for replacing a control shaft drive device, and more particularly to a method for replacing a control shaft drive device that allows easy movement of the control shaft drive device to a control shaft drive device handling device.

The control ram drive device (hereinafter referred to as CRD) is replaced when the reactor is shut down.

This replacement work will be carried out in an environment with high radioactivity levels.
In order to eliminate the risk of radiation exposure for workers,
An automatic control system exchange method described in Japanese Patent No. 140793 has been proposed. However, with this device, the CRD
When inserting the CRD into the pedestal and removing it from the pedestal, the CRD is removed between the CRD handling device and the cart.
is transshipped. This transshipment work is extremely difficult and is one of the reasons for prolonging the work time for CRD replacement work. The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art,
The objective is to shorten the time required for CRD replacement work.

The CRD replacement method of the present invention includes moving a control shank drive device handling device equipped with a control shank drive device carrying means to a position below a predetermined control shank drive device to be taken out from the reactor vessel, and removing the control shank drive device from the reactor vessel. is lowered, placed on the control shank conveying means, the control shank driving device conveying means on which the control shank driving device is mounted is removed from the control shank driving device handling device, and then the control shank driving device conveying means is characterized by moving the control shaft to outside the containment vessel and lowering the control shaft drive device from the transport means.

A reactor pressure vessel 1 is fitted onto a vedestal 2 located within a containment vessel (not shown).

A CRD housing 3 and a neutron east measuring instrument housing 4 are provided in a protruding manner at the lower part of the reactor pressure vessel 1 . CR
The D housing 3 and the neutron east measuring instrument housing 4 also form a part of the reactor pressure vessel 1. CRD5 is C
It is housed in the RD housing 4. A space 6 is formed below the reactor pressure vessel 1 within the vedestal 2 . CR
The loading/unloading entrance 9 through which D is taken in and out of the space 6 is the beddestal 2.
established in A bracket 7 is provided to protrude from the side wall of the pedestal 2 within the space 6. An annular rail 8 is installed on the top of the bracket 7. The turning movement device 11 moves on the rail 8. The CRD replacement hawk 10 includes a rotation movement device 11, a CRD attachment/detachment device 20, and a CRD handling device 8.
Consists of 3.

The outline of the turning movement device 11 is shown in FIGS. 2 and 3.

A drive motor 12 is attached to the pivot movement device 11.
The drive motor 2 is connected to wheels 13. The wheels 13 are layered on the wheels 8. Two frames 15 are provided on the turning movement device 11 to face each other.

Guide grooves 14 are formed between frames 15. The traveling guide rail 16 is attached to the lower part of the frame 15. A rail 17 that guides the wheels 22 provided on the traveling cart 21 of the CRD attachment/detachment device 20 is provided above the traveling guide rail 16.
is provided. A rail 18 for guiding wheels 85 (see FIG. 9) provided on a mast moving cart 84 of the CRD handling device 83 is provided at the bottom of the traveling guide rail 16. The grating 19 is installed on the upper part of the rotation moving device 11. The CRD attachment/detachment device 20 is shown in FIGS. 4, 5, and 6.
As shown in the figure.

Fig. 5 shows the upper part of the CRD attachment/detachment device 20, and Fig. 6 shows the CRD
The lower part of the attachment/detachment device 20 is shown. CRD attachment/detachment device 2 Kawama 4th
As shown in the figure, a traveling trolley 21 is included. The wheels 22 of the traveling truck 21 are mounted on the wheels 17. A travel drive device 23 consisting of a motor 24 and a speed reducer 25 is installed on the travel truck 21. The motor 24 is connected to the wheels 22 via a reduction gear 25. The attachment/detachment device main body 26 is fixed to the traveling carriage 21. Bolt 114 connecting CRD housing 3 and CRD 5 (hereinafter referred to as CRD connection bolt)
connection bolt handling device 33 for attaching and removing
A cooling water scattering prevention device 44 for collecting cooling water leaking from inside the CRD housing 3 is provided at the upper part of the housing 27.

Inside the housing 27, an uncoupling device 47 for disconnecting the CRD 5 from a control rod (not shown) connected to the upper end of the CRD 6 and a lifting device 62 are provided. The housing 27 is composed of several housings that will be described later.

A housing 28 located at the bottom of the housing 27 is attached to the traveling carriage 21 as will be described later. The housing 29 is attached to the upper end of the housing 28 via the flange of the lifting column 63. Housings 30, 31 and 32 are arranged in sequence above housing 29, each of them being fixed to each other. Housing 32 is located at the top of housing 27. An annular passageway 128 is formed between housing 32 and adapter 58. Circular passage 1
24 is formed within housing 31. housing 30
A passage 125 formed between the annular passage 1 and the housing 31 is connected to the annular passage 1 by a closure 126 provided in the housing 31.
24 and passed the lotus. A passageway 127 is formed between housing 29 and housing 31. Connection bolt handling device 3
3 consists of an air motor 35 with a built-in speed reducer and a bolt wrench 39. Air motor 35 is attached to a flange of housing 32. Further, there are eight sets of air motors 35, the same number as the number of bolts 114 connecting the CRD housing 3 and CRD 5, and they are arranged around the housing 31 at approximately equal intervals. A rotating shaft 37 having a space 38 inside is connected to a rotating shaft 36 existing in the air motor 35, and a bolt wrench 39 is inserted into the space 38 of the rotating shaft 37. A coil spring 40 is disposed within the space 38 and constantly presses the bolt wrench 39 upward. The rotating shaft 37 and the bolt wrench 39 are installed in a bolt house 41 attached to the upper part of the housing 32. The through hole 34 is located between the upper end of the bolt house 41 and the space 72 in the center of the bolt house 41.
Concatenate. A bearing 43 is provided between the rotating shaft 37 and the bolt house 41. A bolt holder 42 is formed in the upper part of the bolt house 41, and a bolt wrench 39 is inserted into the bolt holder 42. A through hole 159 connecting the bolt holder 42 and the space 72 is provided in the bolt house 41. 160 is a vibration meter that confirms removal of the connecting bolt 114.

The cooling water scattering prevention device 44 is composed of a drain sleeve 45 consisting of an inner drain leaf 115 and an outer sleeve 116, a piston rod 117, an air cylinder 118, a piston 119 connected to the piston rod in a air cylinder 118, and a drain passage 120.

A cylindrical drain sleeve 45 is arranged to surround the bolt house 41. A packing 46 is installed between the bolt house 41 and the drain sleeve 45. Piston rod 11 connected to drain sleeve 45
The upper end of the drain sleeve 7 passes through the lower end of the outer drain sleeve 116 and is attached to the lower end of the inner drain sleeve 115.
A seal ring 49 is disposed between a protrusion 121 on the upper end of the inner drain sleeve 115 and a protrusion 122 on the upper end of the outer drain sleeve 116 . Drain passage 120 is constituted by through holes 34 and 159, space 72, annular passages 128 and 124, closure 126, passages 125 and 127, and hole 129 in lifting column 63. The uncoupling device 47 installed in the housing 27 consists of a cylinder 48, a piston 56 and a detector 61.

A cylinder 48 is inserted into the housing 31 . A plug 50 is attached to the lower end of the cylinder 48, and the cylinder 48
The bottom edge of is sealed. Within the plug 50 are passages 51 and 6.
3 is provided. Conduits 52 and 54 are connected to passageways 51 and 53. A piston 56 is inserted into the cylinder 48 . The passage 51 is connected to a space 55 formed between the plug 50 and the piston 56. A guide ring 57 is attached to the top of the piston 56 and is in contact with the inner surface of the housing 31 . Adapter 58 having a hole 123 at the top
is arranged above the guide ring 57. A through hole is provided in the center of the guide ring 57 and the adapter 58. The tube 59 having the piston portion 60 is the piston 5
6. Piston part 60' and coil spring 10
It is pushed downward by 3. A detector 61 is attached to the upper end of the tube 59. The structure of the lifting device 62 will be described below.

The lifting device 62 consists of a lifting column 63 and a drive device 65. Lifting column 63 is arranged within housing 28 . The upper end of the lifting column 63 is inserted between the housings 29 . A slide bearing 73 is provided at the upper portion between the housing 28 and the lifting column 63, and a slide bearing 74 is provided at the lower portion between them. A casing 71 is attached to the housing 28. A drive device 65 is housed within the casing 71. The drive 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;
It is composed of a worm wheel 68 that meshes with the worm 67, a rotating shaft 70 that is attached to the casing 71 via a bearing 155 and supports the worm wheel 68, and a pinion 69 that is attached to the rotating shaft 70. The pinion 69 meshes with a rack 64 provided on the lifting arm 63. A support sleeve 76 surrounds the top of the housing 28.

Bearing 77 connects housing 28 and support sleeve 7
6-. A clip 72 provided on the support sleeve 76 is attached to the traveling truck 21. This supports the attachment/detachment device main body 26. A gear 78 is provided at the bottom of the housing 28 . A support sleeve 79 is arranged around the housing 28 below the gear 78 . A bearing 80 is provided between the housing 28 and the support sleeve 79. The clip (same shape as the clip 72) provided on the support 79 also
1. A gear 82 attached to an air motor 81 meshes with the gear 78. The air motor 81 is fixed to the traveling truck 21. Next, the CRD handling device 83 is shown in FIGS. 10, 11, and 12.

The CRD handling device 83 includes a mast moving trolley 84, a traveling drive device 86, a mast 91, a CRD lifting device 94, a mast overturning device 107, and a cart 132 as a transportation means. The wheels 85 of the mast moving truck 84 are mounted on the wheels 18. The traveling drive device 86 is installed within the mast moving truck 84. The shaft of the motor 87 is connected to the wheels 85 via a reducer 88 and a transmission 89. A support shaft 90 is fixed to the mast moving trolley 84.

The mast 91 is provided to pass through the inside of the mast moving truck 84. Support plates 92 and 93 fixed to mast 91 are rotatably attached to support shaft 90 . A pair of guide rails 130 are installed on the mast 91 and extend in the axial direction of the mast 91 . A pair of overturn prevention plates 131 are provided on each guide rail 1.
301 are provided on the mast 91 to face each other.

The mast rolling device 107 is installed inside the mast moving trolley 84.

The air motor 108 is connected to the pinion 1 via a reducer 109.
10 (FIG. 10). The pinion 110 meshes with a sector gear 111 attached to the support plate 93. The detailed structure of the cart 132 as the transportation means is shown in FIGS. 13, 14, 15, 16, 17, and 1.
This will be explained based on FIG.

The cart 132 includes a CRD lifting device 94 and a power cart main body 133.
and a CRD gripping device 146. A plurality of axles 134 are provided in the axial direction of the cart body 133. End plates 135 and 136 are provided at both ends of the cart body 133, and two pairs of hanging fittings 137 are provided on the cart body 133.
mounted on the side of the The CRD lifting device 94 consists of ball screws 95 and 96, a lifter 97, and ball nuts 98 and 99. Connected to cart body 133 are ball screws 95 and 96 whose ends are rotatably mounted to end plates 135 and 136 via bearings 138 and 139. Ball nuts 98 and 99 provided on lifter 97 mesh with ball screws 95 and 96.
A recess 100 for receiving the CRD is provided in the lid 97. Furthermore, a notch 112 is provided in the lifter 97. Iron fittings 140 and 141 having hexagonal cross sections are provided at the lower ends of pole screws 95 and 96, respectively. The iron fittings 140 and 141 are connected to the wrench 14 of the lifting drive device 143 provided on the bottom plate 142 of the mast 91 shown in FIG.
4 and 145, respectively. wrench 144
and 145 are provided with holes having a hexagonal cross section.
The lifting drive device 143 includes an air motor 101 installed on the bottom plate 142, a speed reducer 102, and wrenches 144 and 145. Air motor 101 is reducer 1
02 and the wrench 144 and 1 through the gear group 105.
45. The CRD gripping device 146 is attached to the end plate 135
established in

Details of the CRD gripping device 146 will be explained based on FIGS. 16 and 17. The CRD gripping device 146 includes grapples 147A and 147B, rotation shafts 148A and 14
8B, and slide plates 150A and 150B. Rotating shafts 148A and 148B are bearings 15
1 to the end plate 135. Rotating shaft 148A
and a rectangular section 149 at one end of 148B.
A and 149B are present. Grapples 147A and 147B connect end plates 13 to rotating shafts 148A and 148B.
Mounted on the outside of 5. The end plate 1 within the force main body 133
35 is provided with guide rods 152A and 152B. Slide plates 150A and 150B are guide rods 152
A and 152B. Slide plates 150A and 150B are provided with rectangular through holes, into which rotating shafts 148A and 148B having teardrop portions 149A and 149B are inserted, respectively.
Coil spring 153A connects end plate 135 and slide plate 150A
It is attached to the rotating shaft 148A between. coil spring 15
3B is the rotating shaft 1 between the end plate 135 and the slide plate 150B.
48B installed. Gratple 147A and 14
There is a pair of claws 154 on the grip portion of 7B. The operation for removing the CRD 5 from inside the CRD housing 3 will be described.

The motor 2 is driven to rotate the turning movement device 11 on the rail 8, and the motor 24 is further driven to move the traveling cart 21 along the rail 17, so that the attachment/detachment device main body 26 is moved under the CRD 5 to be removed. to be located. CRD attachment/detachment device 20
is located at position A, which is represented by a solid line in FIG. Drive the air motor 66 and transmit the driving force to the pinion 69,
Rotate the pinion 69. As the pinion 69 rotates, the elevating column 63 on which the rack 64 is mounted rises. For this reason, the attachment/detachment device main body 2 above the sleeve 29
6 part rises. The top of bolt wrench 39 is CRD
Immediately before contacting the connecting bolt, the air motor 66 is stopped to stop the lifting column 63 from rising. After that, the air motor 81 is driven, and the housing 2 to which the gear 78 is attached is driven.
8 rotates. The connecting bolt handling device 33 also rotates at the same time. The bolt wrench 39 and the CRD master bolt are positioned. After the positioning is completed, the air motor 66 is driven and the elevating column 63 is raised. When the elevating column 63 is raised, the drive of the air motor 66 is stopped when the tapered portion 156 of the CRD 5 comes into contact with the tapered hole of the seat 157 provided above the bolt house 41. The bolt wrench 39 engages with the head of the CRD connection bolt. The upper end of the adapter 58 contacts the lower surface of the CRD 5, and the lower end of the piston tube 158 of the CRD 5 is inserted into the hole 123 of the adapter 58. Before removing the CRD 5, it is necessary to release the connection between the CRD 5 and the control rod (not shown).

The control rod is attached to the upper end of the CRD 5 within the reactor pressure vessel 1, as shown in FIG. 8 of Tokukan Sho 52-140793. The uncoupling operation between the control rod and the CRD 5 is performed as follows. compressed air is introduced into space 55 through conduit 52 and passageway 51;
Push the piston 56 upward. Eventually, adapter 58
touches the piston tube 158 of the CRD 5 and pushes the piston tube 158 upward. piston tube 158
An uncoupling rod (not shown) is provided at the upper end of the . As the uncoupling rod rises, the mechanical connection between the control rod socket and the CRD 5 spud is released, although not shown. By operating CRD5,
Lower the index tube (not shown) inside the CRD5. A spud located at the top end of the index tube is withdrawn from the control chamber. Control rod and CRD5
are completely separated. Compressed air is supplied through conduit 54 and passage 53 to space 104 defined by cylinder 48, plug 50, tube 59 and piston portion 60. As the piston portion 60 moves upward within the piston 56, the detector 61 is inserted into the piston tube of the CRD 5. If the index tube is lowered to a predetermined position, it is detected by the detector 61 by the operation described in Samurai Publication No. 52-140793. In this way, it is possible to confirm that the control rod and the CRD 5 are disconnected from each other. Next, the outline of the CRD exchange method of the present invention will be specifically explained. After the control rod and CRD 5 are separated, compressed air is introduced into the air cylinder 118 and the piston 11
Raise 9.

As piston rod 117 rises, inner drain sleeve 115 also rises. Under the action of the protrusion 121 of the inner drain sleeve 115, the sealing sill 49 and the outer drain sleeve 116 are raised. Eventually, the lower end of the outer drain sleeve 116 hits the stepped portion of the bolt house 41, and the outer drain sleeve 116 stops rising. Since the inner drain sleeve 115 is still raised, the seal ring 49 between the protrusions 121 and 122 is compressed, and the sealing between the CRD housing 3 and the drain sleeve 45 is effectively achieved. At this time, the seal ring 49 exists above the lower end surface of the flange of the CRD housing 3. Air is supplied to the air motor 35 through the conduit 75 to drive the air motor.

The rotational force of the air motor 35 is transmitted to the bolt wrench 39 via the reducer 34 and the rotating shafts 36 and 37, and the bolt wrench 39 is rotated. When the CRD connection bolt 114 loosens,
The bolt wrench 39 descends, compresses the coil spring 40, and enters the space 38 of the rotating shaft 37. Then, the CRD connecting bolt 114 is loosened, the CRD connecting bolt 114 is removed from the CRD housing 3, and its head is inserted into the bolt holder 42. The connection between the CRD 5 and the CRD housing 3 is released. The air motor 66 is driven, and the elevating column 6
Lower 3 a little. Cooling water in the CRD housing 3 flows out from the gap formed between the CRD housing 3 and the CRD 5 and flows into the spaces 42 and 124 via the through holes 34 and 159. The drain sleeve 45 prevents this flowing cooling water from scattering around. The cooling water that flows out is drained to the bottom of the space 6 through the drain passage 120. Cooling water with a high radioactivity level is not scattered into the working atmosphere in the space 6. When the discharge of the cooling water in the CRD housing 3 is completed, the drain sleeve 45 is lowered. Furthermore, the compressed air in spaces 55 and 104 is released, and piston 56 and tube 59 descend and return to their original positions. The air motor 66 is driven again and the elevating column 63 is lowered. The CRD 5 is pulled out from the CRD housing 3 while being attached to the upper end of the bolt house 41.
When about half of the CRD 5 is pulled out from the CRD housing 3, the lifting column 63 stops lowering. The motor 87 is driven to move the CRD handling device 83 located at the end of the rail 18 along the rail 18 to a position below the CRD, and as shown in FIG.
D engage with the attachment/detachment device 20. The lifter 97 is previously positioned at the upper end of the mast 91 before engagement. The lifting of the rift 97 is carried out as follows.

The rotational force of the air motor 101 is transmitted to the wrenches 144 and 145 via the reducer 102 and the gear group 105.
is transmitted to ball screws 95 and 96 via. By rotating the ball screws 95 and 96, the ball nut 9
The lifter 97 is raised by the actions of 8 and 99. The lifter 97 rises and pushes up the slide plates 150A and 150B along the guide rods 152A and 152B. Since the operating parts 149A and 149B move within the rectangular through holes of the slide plates 150A and 150B, the rotating shaft 1
48A and 148B are arrows 157, A and 157B
(Fig. 17). With the rotation of rotation axes 148A and 1488, grapples 147A and 14
7B also rotates in the same direction, and grapples 147A and 14
7B opens. On the other hand, since the traveling cart 21 and the mast moving cart 84 move separately on the rails 17 and 18, the engagement between the CRD attachment/detachment device 20 and the CRD handling device, that is, the lifter 97 is placed on the axis of the attachment/detachment device main body 26. Recess 10
It is easy to locate the center of the When the CRD handling device 83 is engaged with the CRD attachment/detachment device 20, the CRD
5 is inserted into a notch 112 provided in the lifter 97. The lifting column 6 is moved by driving the air motor 66.
3, the bolt house 41 lowers and CRD5
is delivered from the CRD attachment/detachment device 20 to the CRD handling device 83. The flange at the lower end of the CRD 5 is fitted into the recess 100 of the lifter 97. When the CRD attachment/detachment device 2 and the bolt house 41 are lowered to the lowest movable position, they are moved along the rail 17 to point B in FIG. The lifter 97 is lowered by driving the air motor 101 and rotating the ball screws 95 and 96. When lifter 97 separates from slide plates 150A and 150B, slide plates 150A and 150B are pushed down by the action of coil springs 153A and 153B. by this,
Rotation axes 148A and 148B are indicated by arrows 157A and 1
57B, and grapples 147A and 147B are closed. Gratple 147A and 14
Since 78 is closed, CRD5 is connected to CRD housing 3.
Even if it is pulled out more completely, the CRD 5 on the lifter 97 will not fall. The lifter 97 descends to the bottom and CR
Removal of the CRD 5 from the D housing 3 is completed. Further, the rotation moving device 11 and the mast moving cart 84 are moved, and the CRD handling device 83 is moved to a position suitable for overturning the mast 91.

When the mast 91 reaches the rollover position, the air motor 108
is driven. The rotational force of the motor 108 is transferred to the reducer 10
9 and pinion 110 to sector gear 111 . At the same time as the sector gear 111 rotates about the support shaft 90, the mast 86 is rolled over in the direction of the arrow 113 in FIG. With this operation, the CR on the CRD handling device 83 is
The axis of D5 is oriented horizontally, and the top of CRD 5 is oriented toward the loading/unloading port 9. The turning movement device 11 is driven, and the CR
D5 is directed toward the loading/unloading entrance. CRD handling device 8
A cart 132, which is a transportation means, is taken out from inside 3.

This cart 132 has iron fittings 140 and 141 inserted into wrenches 144 and 145, and wheels 134 inserted between a guide rail 130 and an overturn prevention plate 131.
It is attached to the RD handling device 83. Therefore, C.R.
When the axis of D5 is oriented horizontally, if the cart 132 is pulled in the direction of the loading/unloading entrance 9, the cart 132 can be easily removed from the CRD.
It is taken out from the handling device 83. Mochikai Showa 52-14079
As shown in FIG. 3 of Publication No. 3, the cart 132 is moved on the loading/unloading bridge that connects the loading/unloading entrance 9 and the control/drive device loading/unloading entrance of the containment vessel.
taken out of the containment vessel. Maintenance and inspection of CRD5 will be performed outside the containment vessel. The CRD 6 or the new CRD 5 for which maintenance and inspection have been completed is inserted into a predetermined CRD housing by the reverse procedure described above.

That is, the cart 132 with the CRD 5 reloaded thereon is attached to the mast 91 of the CRD handling device 83, and then the mast 91
Rotate it so that it is vertical.

The CRD handling device 83 is moved so that the CRD 5 is positioned below a predetermined CRD housing 3, and the CRD 5 is transferred onto the attachment/detachment device main body 26 at the same location. Detachable device body 2
6, the CRD 5 is attached to the CRD housing 3. According to the present invention, there is no need to transfer CRDs between the cart and the CRD handling device, and the work time for CRD replacement work is significantly shortened.

[Brief explanation of drawings]

FIG. 1 is a side view of a preferred embodiment of the present invention, FIG. 2 is a plan view of the turning movement device shown in FIG. 1, and FIG.
-m sectional view, FIG. 4 is a plan view of the CRD attachment/detachment device shown in FIG. 1, FIG. 7 is a cross-sectional view of the bottom of the main body, FIG. 7 is a cross-sectional view of the skin in FIG. 5, FIG. 8 is a cross-sectional view of the skin in FIG. Fig. 10 is a side view of the CRD handling device shown in Fig. 1, Fig. 11 is a cross-sectional view of the CRD handling device shown in Fig. 10, Fig. 12 is a view taken from the Yanagi Ichiyanagi arrow in Fig. 10, and Fig. 13 is a plan view of the cart. Figure 14 is a side view of the cart, Figure 15 is a sectional view taken along line XV-XV in Figure 14, and Figure 14 is a side view of the cart.
Figure 6 is an enlarged view of section XVI in Figure 13, and Figure 17 is an enlarged view of section 16.
The XVD-XVO arrow view in the figure, Figure 18 is the XV in Figure 13.
An enlarged view of part m, FIG. 19 is an explanatory view showing the state of engagement between the CRD attachment/detachment device and the CRD handling device, and FIG. 20 is an explanatory view showing the overturning of the mast of the CRD handling device. DESCRIPTION OF SYMBOLS 1... Reactor pressure vessel, 3... CRD housing, 5... CRD, 11... Turning movement device, 17, 18... Rail, 20・・・・・・
・CRD attachment/detachment device, 21... Traveling trolley, 26.
... Attachment/detaching device body, 27... Housing, 33... Connecting bolt handling device, 39...
... Bolt wrench, 44... Cooling water scattering prevention device,
45...Drain IJ-bu, 47...Uncoupling device, 56...Piston, 58...
・・・．・Adapter, 61...Detector, 62...
... Lifting device, 63... Lifting column, 83.
...CRD handling equipment, 91...Mast,
84... Mast moving trolley, 94...CR
D Lifting device, 97... Lifter, 107...
・・Mast rollover device, 132・・・・Power, 13
3...Cart body, 146...CRD
gripping device. Yu-■ Tea 2 Figure 3 Akuta ``Figure 8 Group Muzu Group s Figure Lo Figure Tais Figure Aquq Diagram Kama-2 Figure Akuta-5 Calm Tsutomu l-4 Group 13 Towns'' Zucha, ” Prisoners [Illustrated map No. q, No. 2 o 4

Claims (1)

[Claims] 1. Move the control rod drive device handling device equipped with the control rod drive device transport means to a position below the predetermined control rod drive device to be taken out from the reactor vessel, lower the control rod drive device, and move it to the control rod drive device. removing the control rod drive device carrying means on which the control rod drive device is placed on a rod carrying means from the control rod drive handling device, and then moving the control rod drive device carrying means outside the containment vessel; A method for replacing a control rod drive device, which further comprises lowering the control rod drive device from the transport means.