JPH045359B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a boiling water nuclear reactor equipped with an internal pump, in which the motor of the internal pump is removed and carried out of the reactor pedestal, and the motor of the internal pump is removed from the reactor pedestal. This invention relates to an internal pump handling device that imports and installs a pump from outside. [Technical Background of the Invention] Conventionally, a boiling water reactor is equipped with a jet pump in the reactor pressure vessel, and a part of the reactor water in the reactor pressure vessel is taken out and pressurized by a recirculation pump to drive the reactor. The reactor water was sent to the jet pump as water, and the jet pump circulated the reactor water through the reactor core. However, such a system has a complicated structure and has problems such as the piping connecting the jet pump and the recirculation pump forming a boundary with the reactor water. In order to solve these problems, a boiling water nuclear reactor equipped with an internal pump as shown in FIGS. 1 and 2 was developed. That is, 1 in the figure is a reactor pressure vessel, and this reactor pressure vessel 1
A shroud 2 is provided inside, and a reactor core 3 is housed within this shroud 2. and,
A plurality of internal pumps 4, for example 12, are provided around the bottom of the reactor pressure vessel 1. Then, the reactor water in the reactor pressure vessel 1 descends in the downcomer 5 formed between the outer circumferential surface of the shroud 2 and the inner circumferential surface of the reactor pressure vessel 1, and is transferred to the internal pumps 4 ... Yotsute reactor core 3
and flows into the core 3 from below. The reactor water that has flowed into the reactor core 3 is boiled by the heat generated by the nuclear reaction, and flows upward as a two-phase flow of water and steam. This two-phase flow of water and steam is separated into water and steam by a steam separator 6, and after moisture is removed from the separated steam in a steam dryer 7, it is sent to a turbine (not shown), etc. Sent. In addition, the separated water is returned to the core 3 by the internal pump 4 together with the water supplied from the water supply spargeer 3.
sent to. Furthermore, a plurality of (approximately 200) control rod drive mechanisms 9 are provided at the bottom of the reactor pressure vessel 1, and these control rod drive mechanisms 9 drive control rods (not shown) into the reactor core. It is inserted into or pulled out from the reactor core 3, and is configured to control the reactivity, etc. of the reactor core 3. The internal pump 4 is constructed as shown in FIG. 2. That is, 10 is a pump section, which includes a differential user 11 and an impeller 12.
It is composed of. The differential user 11 is connected to the reactor pressure vessel 1 by means of a stretch tube 13 and a stretch tube nut 14.
It is fixed to the tip of a stub tube 15 protruding from the bottom of the tube. Reference numeral 16 denotes a motor case, which is welded to the reactor pressure vessel 1 and protrudes from the bottom surface. A water immersion type motor 17 is housed within this motor case 16. A motor cover 17 is provided at the lower end of this motor 17.
a is attached, and this motor cover 17a
abut against the lower surface of the motor case 16 and are tightened and fixed by nuts 19 threaded onto the stud bolts 18, thereby maintaining fluid tightness and fixing the motor 17 to the motor case 16. Further, this motor 17 and the impeller 12 are connected by a shaft 20, and the impeller 12 is driven via this shaft 20. [Problems with Background Art] The internal pump 4 described above is periodically disassembled and removed, and the removed parts are inspected and repaired at another location (outside the reactor containment vessel). To disassemble and remove the internal pump 4 , first disconnect the motor 17 and shaft 20, remove the nuts 9, pull the motor 17 downward from the motor case 16, and then pull the impeller 12 and shaft 20 upward. Pull it out, then remove the stretch tube nut and remove the differential user 11 upward. and,
The motor 17 passes through a cylindrical pedestal that supports the reactor pressure vessel 1 and is carried out of the pedestal through an equipment carry-in/out port formed in the peripheral wall of the pedestal. Incidentally, the assembly and installation of this internal pump 4 is performed in the reverse order of the above. By the way, there is a reactor pressure vessel 1 inside the pedestal.
The control rod drive mechanism 9 protruding from the bottom of the control rod drive mechanism 9, a neutron detector assembly (not shown), and a large number of piping and wiring connected to these are accommodated, so there is little space available. Further, the motor 17 is large in size and heavy in weight. Therefore, this motor 1
The work of removing the motor 7 from the motor case 16 and carrying it out of the pedestal or the work of carrying this motor 17 into the pedestal and attaching it to the motor case 16 is extremely troublesome and the work efficiency is low. Moreover, the high radiation level inside the pedestal limited the amount of time workers could spend there, and sometimes it was necessary to change workers midway through work, further reducing work efficiency. [Object of the Invention] The present invention has been made based on the above circumstances, and its object is to provide an internal pump handling device that allows the removal and installation of an internal pump motor to be carried out efficiently and easily. Our goal is to provide the following. [Summary of the Invention] The present invention provides a motor handling machine for attaching and detaching the motor of an internal pump provided at the bottom of a nuclear reactor pressure vessel to a motor case, and a motor handling machine for attaching and detaching the motor of an internal pump provided at the bottom of a nuclear reactor pressure vessel, and a motor part handling machine that is installed intermediately in a pedestal below the internal pump. a motor handling machine lifting/lowering mechanism for raising and lowering the motor from a position to the position of the internal pump; a loading/unloading mechanism for loading/unloading the motor into or out of the reactor pedestal through an equipment loading/unloading port formed in a peripheral wall of the reactor pedestal; and a transfer mechanism for transferring the motor section from the carry-in/out mechanism to the motor handling machine or from the motor handling machine to the carry-in/out mechanism. Therefore, when removing the motor, use the motor handling machine lifting mechanism to raise the motor handling machine to the position of the internal pump, remove the motor, and compare this motor with the motor handling machine using the motor handling machine lifting mechanism. It is lowered to the middle part of the pedestal where there is a large margin of space, and from this position it is further transferred to the carry-in/out mechanism by the transfer mechanism. When installing the motor, the motor is transferred from the loading/unloading mechanism to the middle part of the pedestal using the transfer mechanism, then transferred to a position below the internal pump, and then raised together with the motor by the motor handling machine lifting mechanism. and attach it to the motor case. Therefore, operations such as attaching and detaching the motor can be carried out efficiently and easily. [Embodiments of the Invention] Examples of the present invention will be described below with reference to the drawings. 3 to 15 show a first embodiment of the present invention. In FIG. 3, 50 is a nuclear reactor building, and a reactor containment vessel 51 is provided within this reactor building 50 . And this reactor containment vessel 51
A pressure suppression chamber 52 is formed inside. Also,
Reference numeral 53 is the ceiling of the building, and a traveling rail 54 is provided along this ceiling 53, and an overhead traveling crane 55 is configured to travel along this traveling rail 54. Further, 56 is a fuel pool for storing nuclear fuel, and 57 is an equipment storage pool for storing extracted in-core equipment. Further, around the reactor containment vessel 51, rooms 58 and 59 are provided to accommodate various types of equipment. The reactor pressure vessel 1 described above is accommodated within the reactor containment vessel 51. At the bottom of the reactor pressure vessel 1, the plurality of internal pumps 4 , control rod drive mechanisms 9, etc. described above are provided. Reference numeral 101 is a cylindrical pedestal that supports the reactor pressure vessel 1, and an equipment loading/unloading port 102 is formed in the lower part of the peripheral wall of the pedestal. A rotating platform 103 is provided in the middle of the pedestal 101.
This rotating platform 103 has a substantially circular shape,
It is guided by an annular rail 105 attached to the pedestal 101 side via support members 104, and is rotatable in a horizontal plane. The rotating platform 103 is rotated in a horizontal plane by drive mechanisms 106 and is configured to be stopped at any position. The rotating platform 103 is provided with an attachment/detachment device for the control rod drive mechanism 9, and the configuration thereof will be explained below. In the figure, reference numerals 107, 107 are guide rails, which are provided in the diametrical direction of the rotating platform 103. And this guide rail 10
A movable table 108 is movably provided on 7 and 107, and is configured to be moved to an arbitrary position by a drive mechanism 109. This moving table 108 is provided with an arm 110,
The arm 110 is configured such that its intermediate portion is rotatably supported in a vertical plane by a pin 111, and is rotated between a vertical position and a horizontal position by a drive mechanism. Sprockets 112 and 113 are provided at both ends of this arm 110, and an endless chain 114 is stretched between these sprockets 112 and 113.
is driven to travel by a drive mechanism 115. A support stand 116 is attached to the chain 114, and the support stand 116 moves along the arm 110 as the chain 114 runs. Furthermore, a holding mechanism 117 is provided at the upper end of this arm 110 to hold the removed control rod drives 9. Further, on the guide rail 107, a bolt attachment/detachment machine conveyance cart 113 is provided. Then, the bolts that attach the control rod drive mechanism 9 to the control rod drive mechanism housing are attached to and detached from the control rod drive mechanism 113.
A bolt attachment/detachment machine 119 for attaching and detaching the bolts 19... is mounted. The bolt attachment/removal machine 119 is configured such that the support base 116 of the arm 110 is transferred. In addition, the equipment loading/unloading entrance 10
A loading/unloading rail 120 is provided through 2, and a control rod drive mechanism transport vehicle 121 is configured to run on this loading/unloading rail. Further, lifting guide rails 122 are suspended downward from the rotating platform 103. A lifting rail 123 is attached to the lifting guide rail 122 so as to be able to rise and fall freely, and is raised and lowered by a drive mechanism 109.
23 is configured to match and be continuous with the carry-out rail 120 in a lowered state, and to rise to below the arm 110. When removing the control rod drive mechanism 9, the rotating platform 103 is rotated and the movable table 103 is moved in the radial direction, and the arm 110 is removed.
Position it directly below the control rod drive mechanism 9 to be removed. Next, this arm 110 is erected vertically as shown in FIG.
3, and the bolt attachment/detachment machine 119 placed on the bolt attachment/detachment machine conveyance trolley 113 is moved to the arm 1.
It is attached to the support stand 116 of 10. Then, the chain 114 of the arm 110 is run, and this support base 1
16 and pull up the bolt attachment/detachment machine 119 to the position of the control rod drive mechanism 9... Then, the control rod drive mechanisms 9 are removed by the bolt attachment/removal machine 119, the support base 116 is lowered, and the control rod drive mechanisms 9 are pulled out. And this control rod drive mechanism 9
... are held by the holding mechanism 117, the bolt attaching/removing machine 119 is moved from this support stand 116 to the bolt attaching/detaching machine carrier 113, and the bolt attaching/detaching machine carrier 113 is moved backward. Next, rotate the arm 110 to the horizontal position and remove the control rod drive mechanism 9.
…hold horizontally. Then, the control rod drive mechanism transport trolley 121 is moved from the loading/unloading rail 120 onto the elevating rail 123, and the elevating rail 123 is raised to raise the control rod drive mechanism transport trolley 121 to just below the arm 110, and the control rod drive Mechanism 9
... onto this control rod drive mechanism transport trolley 121. Then, the elevator rail 123 is lowered, and the control rod drive mechanism transport cart 121 is moved to the loading/unloading rail 120.
The control rod drive mechanism 9 is moved upward and carried out to the outside of the pedestal 101 through the equipment carry-in/out port 102. In addition, when installing the control rod drive mechanism 9..., the procedure is reversed to the above. Further, an internal pump handling device according to the present invention is provided in this pedestal 101,
The internal pump handling device is configured to attach and detach the motors 17 of the internal pumps 4 . The configuration of this internal pump handling device will be explained below. This internal pump handling device includes a motor handling machine 130 that attaches and detaches the motor 17 of the internal pump 4 . A motor handling mechanism elevating mechanism 131 that lifts and lowers the motors 17 to the position shown in FIG . It consists of First, the configuration of the transfer mechanism 133 will be explained. In the figure, a frame 134 is provided at the lower part of the rotating platform 103, and four guide rails 135 are vertically provided between the frame 134 and the upper surface of the rotating platform 103. And this guide rail 1
A lifting table 136 is provided guided by the frame 134 and the rotating platform 103 by a drive mechanism 137.
It is configured to move up and down between the upper surface of the
In addition, a passage hole 138 is formed in the lifting table 136 through which the motor 17 equipped with a motor caster can pass vertically. Further, rails 139, 139 are provided on the upper surfaces of the frame 134 and the lifting table 136, and these rails 139 are configured to be continuous with each other when the lifting table 136 is lowered to the position of the frame 134. . Further, reference numeral 140 denotes a moving platform, which is configured to run on these rails 139, 139. Note that the frame 134 and the lifting platform 136 are connected to the guide rail 10 of the attachment/detachment device of the control rod drive mechanism described above so as not to interfere with the attachment/detachment device.
It is provided on the side of 7 and perpendicular thereto. Further, the radial position of the lifting table 136 is configured to match the radial position of the internal pump 4 , and by rotating the rotating platform 103, the lifting table 136 can be moved to any internal pump. It is configured so that it can be positioned directly below the pump 4 . Next, the configurations of the motor handling machine 130 and the motor handling machine lifting mechanism 131 will be explained. Reference numeral 150 is a driving body of the motor handling machine lifting mechanism 131 , and this driving body 150 is placed on the moving table 140. Moreover, a motor handling machine 130 is further placed on this driving body 150. This motor handling machine 130 handles the motor 17... in the motor case 1.
The motor 17 is configured so that the nuts fixed to the motors 6 and 6 can be automatically attached and detached, and the motors 17 can be automatically attached and detached. The drive body 150 is provided with a pair of rotation drive mechanisms 151, 151.
Further, 152, 152 are screw rods, for example, ball screws, and the ball screws 152, 152,
At the upper end of 152 are bearings 153, 153, respectively.
A connector 154, 1 is provided at the lower end.
54 is attached, and ball nuts 155, 155, 156, 156 are further screwed into the intermediate portion. Furthermore, hook members 15 are provided on both sides of the motor case 16 of the internal pump 4 , the motor 17, and the motor handling machine 130, respectively.
7,157,158,158,159,159 are provided. The bearings 153, 153 at the upper ends of the ball screws 152, 152 are attached to the hook members 157, 157 of the motor case 16, and the ball nuts 155, 155, 1
56, 156 are motor 17... and hook members 158, 158, 159, 15 of motor handling machine 130
9, and the connectors 154, 154 are configured to be connected to the rotation drive mechanisms 151, 151 of the drive body 150. Therefore, when the ball screws 152, 152 are rotated by the rotation drive mechanism 151, 151, the ball nuts 155, 155, 156, 156 are screwed,
The motor 17 and the motor handling machine 130 are configured to move up and down. Note that these ball screws 152, 152 are configured to be removed when not in use. Further, the hooking members 153, 153 of the motor case 16 have bolts 160...
It is attached to the motor case 16 by
By removing these bolts 160..., the ball screw 15 together with the hooking members 157, 157 can be removed.
2,152 can be removed. Further, a motor cask storage space 161 is provided on the inner circumferential surface of the pedestal 101 in correspondence with the upper part of the equipment loading/unloading entrance 102, and a motor cask 162 is configured to be placed on this motor cask storage space 161. . This motor cask 162 has a cylindrical shape, and its lower end is open.
Motor 1 with this motor cask 162 removed
7, and attach the lower end to the motor cover 1 of the motor 17.
7a, and is configured so that the portion of this motor 17 that was in contact with reactor water can be housed inside. Further, a pair of support pins 163, 163 are provided protruding from both sides of the motor cask 162, and a lifting metal fitting 164 is provided at the upper end. Moreover, a rail 165 is provided in the radial direction above the motor cask storage area 161, and an electric hoist 166 is movably attached to this rail 165. And this electric hoist 166
The structure is such that the motor cask 162 can be lifted up by. Further, the loading/unloading mechanism 132 is constructed as shown in FIGS. 14 and 15. That is,
170 is a loading/unloading cart, and this loading/unloading cart 1
70 is configured to run on the loading/unloading rail 120. And this loading/unloading trolley 17
A pair of support members 171, 171 are provided protrudingly on the top of the motor cask 162.
The motor cask 162 can be rotated about support pins 163, 163 and supported in a horizontal state. Next, the operation of this first embodiment will be explained. first,
When the motor 17 of the internal pump 4 is to be removed, the rotating platform 103 is rotated and the lifting platform 136 is positioned directly below the internal pump 4 to be removed. Next, move the moving table 140,
It is placed on the lifting table 136. Next, this lifting platform 1
36 is raised to the upper surface of the rotating platform 103. Next, the ball screws 152, 152 are attached, and the rotational drive mechanism 151, 1 of the drive body 150 is
51, and the motor handling machine 130
and raise it to the position of internal pump 4 . Then, the motor 1 is controlled by this motor handling machine 130.
Remove 7. Next, ball screw 152, 15
2 is reversely rotated, the removed motor 17 and motor handling device 130 are lowered onto the moving table 140, and the ball screws 152, 152 are removed. Next, the lifting platform 136 is lowered to the position of the frame 134. Next, rotate the rotating platform 103,
This motor 17 is moved to a position corresponding to the equipment loading/unloading entrance 102. Next, the motor cask 162 is hoisted up by the electric hoist 166 and lowered onto the motor 17, and the removed motor 17 is housed in the motor cask 162. Next, the motor 17 together with the motor cask 162 is lifted up a little, and the moving table 140 is retracted onto the frame 134. Then, move this motor cask 162 to the lifting platform 1.
36 through the passage holes 138 and suspended onto the loading/unloading cart 170 and supported horizontally, the loading/unloading cart 170 is moved and carried out of the pedestal 101 through the equipment loading/unloading entrance 102. When installing the motor, follow the above steps in reverse. Note that the present invention is not limited to the first embodiment described above. A second embodiment of the invention will now be described with reference to, for example, FIGS. 16-20. In this second embodiment, the motor handling machine lifting mechanism 131 has the same structure as in the first embodiment. The transfer mechanism 233 is configured as follows. That is, in this case, the driving body 150 of the motor handling mechanism elevating mechanism 131 described above is fixed to the upper surface of the rotating platform 103. A movable cart 201 is placed on the drive body 150, and this cart 201
A motor handling machine 130 is placed on top of the motor. Furthermore, a motor cask storage area 210 is provided on the floor of the pedestal 101. Furthermore, an annular platform 104a is formed on the upper part of the support member 104 provided within the pedestal 101. And this platform 104a
A rail 209 is provided circumferentially on the lower surface of the motor cask storage area 210 to the equipment loading/unloading entrance 102, and an electric hoist for hoisting the motor cask can be moved along the rail 209. 205 is installed. Further, an elevator 206 is located on the inner peripheral surface of the pedestal 101 near the equipment loading/unloading entrance 102.
is provided. In addition, the platform 1
04a is formed with a passage hole through which the elevator 206 can pass. Further, a rail 208 is provided along the circumferential direction in front of this equipment loading/unloading entrance 102, and the cart 201 lowered by the elevator 206 is transported along this rail 208 to the front of the equipment loading/unloading entrance 102. It is configured as follows. When the motor 17 is to be removed, the motor 17 and the motor handling machine 130 are first lowered onto the cart 201 in the same manner as in the first embodiment. Next, the rotating platform 103 is rotated, and the trolley 201
match the position of the elevator 206. Then, the elevator 206 is raised so that it matches the height of the cart 201, and the connecting plate 207 is placed over it. Move. Then, the elevator 206 is lowered and the equipment loading/unloading entrance 1 is opened.
Lower it to the height of 02. Then, move the cart 201 on the elevator 206 onto the rail 208,
By moving on this rail 208,
Move it to before 02. Next, the motor cask 162 on the motor cask storage area 210 is lifted up by the electric hoist 205, moved along the rail 209, and moved to the front of the equipment loading/unloading entrance 102. Then, this motor cask 162 is lowered and attached to the motor 17 placed on the trolley 201. Then, the motor cask 162 containing the motor 17 is lifted up, the truck 201 and the motor handling machine 130 placed on the truck 201 are moved backward, the motor cask 162 is placed on the loading/unloading truck, and the motor cask 162 is passed through the equipment loading/unloading entrance 102. Carry it out of the pedestal 101. An annular working platform 202 is provided at the upper part of the pedestal 101, and the working platform 202 has passage holes 203 through which the motors 17 pass, corresponding to the positions of the respective internal pumps. is formed. Further, FIGS. 21 to 23 show a third embodiment of the present invention. This third embodiment is constructed so that the entire rotating platform 103 can be lowered to the level of the equipment loading/unloading entrance 102 by means of a lifting drive mechanism 301. A rail 3 is provided along the radial direction on the upper surface of this rotating platform 103.
02, and on this rail 302, a movable platform 303 on which a motor handling machine lifting mechanism 131 and a motor handling machine 130 are mounted is provided. and,
In this third embodiment, when the motor 17 is removed and placed on the moving table 303, the rotating platform 103
lower the motor 17 to the equipment loading/unloading entrance 10.
2 and rotates the entire rotating platform 103 to move this motor 17 to the entrance of the equipment loading/unloading entrance 102.The other configuration is the same as that of the first embodiment. In addition, in this third embodiment, the control rod drive mechanism 9...
Even if the rotating platform 10 is removed,
3 and lower the arm 110 as shown in FIG.
Then, the control rod drive mechanism 9 is transferred to the control rod drive mechanism transport truck 121. [Effects of the Invention] As described above, the present invention provides a motor handling machine that attaches and detaches the motor of an internal pump provided at the bottom of a nuclear reactor pressure vessel to a motor case, and a motor handling machine that connects this motor part handling machine to a pedestal below the internal pump. a motor handling machine elevating mechanism for raising and lowering the motor from an intermediate position within the reactor to the position of the internal pump; and a transport mechanism for transporting the motor into or out of the reactor pedestal through an equipment transport entrance formed in the peripheral wall of the reactor pedestal. and a transfer mechanism for transferring the motor section from the carry-in/out mechanism to the motor handling machine or from the motor handling machine to the carry-in/out mechanism. Therefore, when removing the motor, use the motor handling machine lifting mechanism to raise the motor handling machine to the position of the internal pump, remove the motor, and compare this motor with the motor handling machine using the motor handling machine lifting mechanism. It is lowered to the middle part of the pedestal where there is a large margin of space, and from this position it is further transferred to the carry-in/out mechanism by the transfer mechanism. In addition, when installing the motor, the motor is transferred from the loading/unloading mechanism to the middle part of the pedestal using the transfer mechanism, transferred to a position below the internal pump, and then raised together with the motor by the motor handling machine lifting mechanism. and attach it to the motor case. Therefore, the effects are great, such as the ability to efficiently and easily attach and detach the motor.

[Brief explanation of drawings]

1 and 2 show the configuration of a boiling water nuclear reactor equipped with an internal pump, with FIG. 1 being a schematic configuration diagram and FIG. 2 being a longitudinal sectional view of the internal pump. 3 to 15 show a first embodiment of the present invention, FIG. 3 is a schematic diagram of the entire nuclear reactor, FIG. 4 is a schematic configuration diagram, and FIG. 5 is a view taken along the - arrow in FIG. Figure 6 is a view in the direction of the - arrow in Figure 4, Figure 7 is a view in the direction of the - arrow in Figure 4, Figure 8 is a front view of the motor handling machine lifting mechanism, and Figure 9 is a view in the direction of the - arrow in Figure 8. Figure, 10th
The figure is a front view of the hook member, and Figure 11 is XI of Figure 10.
-XI arrow view, Figure 12 is a front view of the hooking member,
3 is a view taken along the - arrow in FIG. 12, FIG. 14 is a plan view of the loading and unloading cart, and FIG. 15 is a side view of the same. 16 to 20 show a second embodiment of the present invention, FIG. 16 is a side view, FIG. 17 is a plan view of the motor cask storage area, FIG. 18a is a side view of a part of the motor cask storage area, and FIG. Figure 18b is a plan view of the same, Figure 19 is a side view of a part of the elevator, and Figure 18b is a side view of a part of the elevator.
0 is a view taken along the - arrow in FIG. 16. Second
1 to 23 show a third embodiment of the present invention, FIG. 21 is a side view, FIG. 22 is a plan view, and FIG.
FIG. 3 is a side view showing the state when the control rod drive mechanism is removed. 1...Reactor pressure vessel, 4 ...Internal pump, 16...Motor case, 17...Motor, 1
01...Pedestal, 102...Equipment loading/unloading entrance,
103... Rotating platform, 130... Pump handling machine, 131 ... Pump handling machine lifting mechanism, 1
32... Loading/unloading mechanism, 133 ... Transfer mechanism, 13
6... Lifting platform, 150... Drive body, 152... Ball screw, 162... Motor cask, 1
70... Loading/unloading trolley.

Claims (1)

[Claims] 1. A motor handling machine that attaches and detaches the motor of the internal pump installed at the bottom of the reactor pressure vessel to the motor case, and a motor handling machine that moves the motor from an intermediate position in the pedestal below the internal pump to the position of the internal pump. a motor handling machine elevating mechanism for raising and lowering the motor up and down; a loading/unloading mechanism for transporting the motor into or out of the reactor pedestal through an equipment loading/unloading entrance formed in the peripheral wall of the reactor pedestal; An internal pump handling device comprising: a transfer mechanism for transferring to the motor handling machine or from the motor handling machine to the loading/unloading mechanism.