JPH0540193A - Part detaching device for reactor built-in pump - Google Patents

Abstract

PURPOSE:To obtain a parts detaching device for a reactor built-in pump capable of shortening the work time for coupling the handling tool with a guide rail by hanging the handling tool with a plurality of hanging ropes and changing the direction of relative position of the plurality of hanging ropes from a platform and easily controlling the rotation direction of the handling tool. CONSTITUTION:Provided are a plurality of hanging ropes 16 for hanging a handling tool at a plurality of hanging points and a winding reel 36 for winding up and down the plurality of hanging ropes 16 which is set on a trolley 15 at a platform 14 arranged on an operating floor 2 laied above a reactor pressure vessel 1. Also provided are a rope direction control means 50 to control the direction of the plurality of the hanging ropes 16 in the horizontal plane and a rope correction means 6O set above the handling tool 40 to support the ropes free of rotation on each hanger and control the length difference of the plurality of hanging ropes 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for a built-in-reactor pump for attaching / detaching underwater pump parts of a built-in-reactor pump (hereinafter referred to as an internal pump) built in a boiling water reactor. A component attaching / detaching device.

[0002]

2. Description of the Related Art For example, an improved boiling water reactor is constructed as shown in a vertical sectional view of the periphery of a reactor pressure vessel in FIG. That is, a spent fuel pool 3 and an equipment storage pool 4 are arranged on the operating floor 2 laid above the reactor pressure vessel 1, and a circular shape is provided between the spent fuel pool 3 and the equipment storage pool 4. Reactor well 5 is installed. A reactor pressure vessel 1 is supported by a support 6 in the reactor well 5, and a cylindrical shroud 7, a shroud head 8 and an upper portion thereof are arranged in the reactor pressure vessel 1 so as to surround the reactor core. A steam separator 9 and a steam dryer 10 are housed therein.

Further, a plurality of internal pumps 11 are provided vertically through the bottom of the reactor pressure vessel 1,
Its head is inserted into the reactor pressure vessel 1. These internal pumps 11 are arranged in an annular space 12 formed by the outer peripheral surface of the shroud 7 and the inner peripheral surface of the reactor pressure vessel 1, for example, 10 units are annularly arranged at equal pitches in the circumferential direction. The reactor water is forcedly circulated in the lower part of the pressure vessel 1. A guide rail 13 is attached in the vertical direction on the outer peripheral surface of the shroud 7 on the installation position of each internal pump 11. Further, a platform 14 is provided on the operating floor 2 so as to be able to travel through the upper opening of the reactor well 5, and a trolley 15 traversing the platform 14 is mounted on the platform 14.
Further, one hoisting machine 17 for hoisting the suspension rope 16 is mounted on the trolley 15. Reference numeral 18 in FIG. 8 indicates a reactor pressure vessel head, and reference numeral 19 indicates a containment vessel head.

Next, the structure of the internal pump 11 is shown in FIG.
As shown in the vertical sectional view of FIG. 1, the motor case 20 is inserted into the opening sleeve 1a at the bottom of the reactor pressure vessel 1, the upper end of the motor case 20 is welded to the opening sleeve 1a, and the lower half of the motor case 20 is attached to the reactor. It is hung outside the pressure vessel 1. In the motor case 20, a motor shaft 21 and a hollow pump shaft 22, which are keyed so as to be vertically separable, are rotatably and coaxially housed. A rotor 23 is integrally fixed to the outer circumference of the motor shaft 21, and a stator 24 is arranged on the outer circumference with a predetermined gap. Further, a grip bolt 25 is screwed to the upper end of the pump shaft 22 and an impeller 26 is attached. This impeller 26
There is a diffuser 27 on the outer circumference of the
The lower end of 27 engages with the upper end of the stretch tube 28,
By connecting the stretch tube 28 with the stretch tube nut 29, the diffuser 27 becomes an open sleeve 1.
It is fixed on a.

The diffuser 27 and the stretch tube 28 are keyed to the opening sleeve 1a to prevent them from rotating. Reference numeral 30 in FIG. 9 indicates a closing cover, and reference numeral 31 indicates a secondary seal. The internal pump 11 configured in this way disassembles each component of the internal pump 11 by remote control at the time of periodic inspection of the plant,
It is necessary to re-install after the inspection. For this purpose, it is necessary to remove the pump shaft 22 and the impeller 26 integrally, and the diffuser 27 and the stretch tube 28 upward together. This work is carried out by remote operation at a position of about 30 m underwater by a handling tool (not shown). As shown in the longitudinal cross-sectional view of the reactor pressure vessel around the time of inspection in FIG. 10, the internal pump 11 is attached and detached, and water is filled up to the upper part of the reactor well 5 to shield radiation, The containment vessel head 19, the reactor pressure vessel head 18, the steam dryer 10, the steam separator 9 and the shroud head 8 shown in FIG. 8 are respectively removed, and the handling tool 32 is hung at the end of one suspension rope 16. Positioning is performed by the traveling of the platform 14 and the traverse of the trolley 15, and together with the vertical movement by the hoisting machine 17, the handling implement 40 suspends and moves each component.

The flange 7a of the shroud 7 is provided with two or four relief recesses so that the parts of the internal pump 11 grasped by the handling tool 40 can pass through. That is, when installing the internal pump 11 after inspecting the parts, the internal pump 11 grasped by the handling tool 40
Parts from the reactor well 5 and the shroud 7
Of the internal pump 11 along the annular space 12 formed by the outer peripheral surface of the shroud 7 and the inner peripheral surface of the reactor pressure vessel 5 below the flange 7a of the shroud 7 and passing through the relief recess of the flange 7a of Performs horizontal circumferential movement above the position. Then, the handling tool 40 is rotated and the guide rail 13
The parts of the internal pump 11 are installed by abutting and engaging with and vertically hanging along the guide rail 13. When the parts of the internal pump 11 grasped by the handling tool 40 are moved in the circumferential direction, the parts are suspended in a vertical space portion that does not interfere with the flange 1b protruding inside the reactor pressure vessel 1 and the flange 7a of the shroud 7. The handling tool (40) at the end of the suspension rope (16) is made to follow the movement of the hoisting machine (17) by the movement of the platform (14) and the trolley (15) through the suspension rope (16).

[0007]

[Problems to be Solved by the Invention] Internal pump 11
When the handling tool 40 is moved in the circumferential direction when the above-mentioned parts are installed, it is necessary to engage the guide roller provided on the side surface of the handling tool 40 with the guide rail 13 on the outer peripheral surface of the shroud 7. Therefore, it is necessary to rotate the handling tool 40 to orient the guide roller toward the shroud 7, that is, toward the center of the reactor pressure vessel 1. However, conventionally, since the handling tool 40 is suspended by one suspension rope 16, the operator must twist the suspension rope 16 on the platform 14 in order to adjust the direction. However, platform 14
Since there is a distance of 15 m or more from the top to the flange 7a of the shroud 7, the twist is not properly transmitted, and it is not easy to control the turning direction of the handling tool 40, so the guide rail 13
It took a long time to engage with. Also hanging rope 16
Even if one chain is used instead of the
40 direction adjustment was difficult.

The object of the present invention is to suspend the handling tool by a plurality of suspension ropes and change the relative position of the plurality of suspension ropes on the platform to facilitate the turning direction of the handling tool. Another object of the present invention is to provide a component attaching / detaching device for a built-in-reactor pump which is capable of shortening the work time for engaging the handling tool with the guide rail by controlling the above.

[0009]

[Means for Solving the Problems] A plurality of suspension ropes for suspending a handling tool at a plurality of suspension points, and a trolley of a platform disposed on an operating floor laid above the reactor pressure vessel. A hoisting machine for hoisting and lowering a plurality of suspension ropes, a rope orientation control means for controlling the orientation of the horizontal planes of the plurality of suspension ropes, and a rope for each suspension provided above the handling tool. A rope compensating means is provided which is freely supported and adjusts a difference between mutual lengths of the plurality of suspension ropes.

[0010]

[Operation] When installing the pump parts of the internal pump by remote control after inspection, first hang down the handling tool and pump parts with the hoist on the trolley, move the platform and trolley, and escape the shroud flange. The handling tool is positioned in the annular space formed by the outer peripheral surface of the shroud and the inner peripheral surface of the reactor pressure vessel through the recess. At this time, the guide roller of the handling tool to be engaged with the guide rail is directed toward the center of the reactor pressure vessel, and is suspended by the rope azimuth control means on the platform so that the suspension point of the handling tool faces the tangential direction of the shroud. Change the relative position of the rope. Next, the platform and the trolley are moved to move the handling tool in the circumferential direction in the annular space, and the orientation of the handling tool is easily changed by adjusting the rope azimuth control means so that the plurality of suspension ropes Make sure the bond lines are always aligned tangential to the shroud. The pump component is moved above the installation position by moving the handling tool in the circumferential direction.

At this time, since the guide roller of the handling tool faces the center of the reactor pressure vessel, the guide roller engages with the guide rail on the outer peripheral surface of the shroud as it is. At this time, even if the lengths of the plurality of suspension ropes are different from each other or if the suspension ropes are twisted, the rope correction means corrects them, so that the handling tool is prevented from tilting or rotating. .. Then, the hoisting machine is operated to lower the handling tool, whereby the pump component can be incorporated into the internal pump. In addition, the removal of the pump or the movement of the handling tool alone is performed in the reverse order of the above or the same procedure.

[0012]

An embodiment of the present invention will be described with reference to the drawings. It should be noted that the same components as those of the above-described conventional technique are denoted by the same reference numerals and detailed description thereof will be omitted. FIG. 1 is a vertical cross-sectional view of the periphery of a reactor pressure vessel according to the present invention. An operating floor 2 laid above the reactor pressure vessel 1 is provided with a spent fuel pool 3 and an equipment storage pool 4, A circular reactor well 5 is installed between the spent fuel pool 3 and the equipment storage pool 4. The reactor pressure vessel 1 is supported in the reactor well 5 by 6
The reactor pressure vessel 1 is supported by a cylindrical shroud 7, a shroud head 8, and a steam separator 9 and a steam dryer 10 arranged above the shroud head 8.

Further, a plurality of internal pumps 11 are vertically penetrated at the bottom of the reactor pressure vessel 1,
Its head is inserted into the reactor pressure vessel 1. These internal pumps 11 are arranged in an annular space 12 formed by the outer peripheral surface of the shroud 7 and the inner peripheral surface of the reactor pressure vessel 1, for example, 10 units are annularly arranged at equal pitches in the circumferential direction. The reactor water is forcedly circulated in the lower part of the pressure vessel 1. A guide rail 13 is attached in the vertical direction on the outer peripheral surface of the shroud 7 on the installation position of each internal pump 11. Further, on the operating floor 2, a platform 14 is provided on a platform rail 32 so that it can travel in the upper opening of the reactor well 5.
Further, a trolley 15 traversing a trolley rail 33 is mounted on the platform 14, and two trolleys 15 are mounted on the table 34 on the trolley 15 as shown in the plan view of the hoisting machine of FIG. A hoist 36 having two rotary drums 35 corresponding to the suspension rope 16 and rotating in synchronization is mounted.

A trolley rail is provided below the trolley 15.
A handrail 37 parallel to 33 is installed, and on this handrail 37, a rope azimuth control device 50 which is a rope azimuth control means shown in the plan view of the rope azimuth control device of FIG.
It is mounted so that it can traverse through 51. The rope bearing control device 50 includes a traverse bearing 51 that engages with the handrail 37.
And a circular rail guide 52 integrally provided with the traverse bearing 51, and a circular rail 53 engaged with the circular rail guide 52 are rotatably incorporated, and a predetermined inside of the circular rail 53. It incorporates two freely rotatable pulleys 54 in contact with two suspension ropes 16 arranged at a distance. Further, below the suspension rope 16, above the handling tool 40, there is a rotating portion 61 for returning the twist of the single rope, which is the rope correction means shown in the front view of the rope correction device in FIG. 4, and a balance for compensating the rope length. A rope correction device 60 including a portion 62 is inserted.
The rope correction device 60 is connected to the handling tool 40 by a lifting bolt 41. In addition, reference numeral 42 in FIG.
Is a guide roller that engages with the guide rail 13 provided on the shroud 7.

The details of the rope compensator 60 are shown in FIG. 5 which is an enlarged block diagram of the rope compensator and BB of FIG. 4 of FIG.
As shown in the plan view along the line, two suspension ropes 16 are arranged side by side at right angles to the direction in which the guide rollers 42 face, and the guide rollers 42 are arranged in the central direction of the reactor pressure vessel 1. Orientation, guide rail 13 attached to the outer peripheral surface of shroud 7
Will be aligned in the tangential direction of the shroud 7. Note that FIG. 6 shows a state in which the guide roller 42 of the handling tool 40 is engaged with the guide rail 13. Rotating part in Figure 5
Reference numeral 61 connects the upper rod 61a and the lower rod 61b, to which the suspension rope 16 is connected, with a guide bearing 61c in the circumferential direction and a thrust bearing 61d supporting the vertical direction via a case 61e, and connects the upper rod 61a and the lower rod 61b. Rotationally coupled, each suspension rope 16 is separately guided by a guide bearing 61c and a thrust bearing when twist occurs when tension is applied or when the direction of the handling tool 40 is changed.
61d rotates lightly to remove the twist of the suspension rope 16,
Rotational force is not generated in the balance portion 62 and the handling tool 40.

In the balance section 62, the rotating section 61
The ends of the two lower rods 61b connected via the pin are rotatably connected to both ends of the balance bar 62a by pins or the like, and the center of the balance bar 62a is also rotatably connected by the pins or the like to the handling tool 40. It is configured by being combined with a lifting bolt 41 that is suspended. Therefore, if there is a difference in the amount of extension between the two suspending ropes 16 that suspend the handling implement 40, the balance bar 62a is tilted by an amount corresponding to the difference in the lengths and the balance bar 62a is suspended. It is prevented that the rope 16 is applied with an unbalanced weight and the handling tool 40 is inclined. 4 and 5, two upper levers 61a, 61a and lower levers 61b, 61
b There is a difference in length between the two, but this is because the two rotating parts 61, 61 do not approach each other and interfere when the distance between the two suspending ropes 16 is short. so,
When there is a sufficient distance between the two hanging ropes 16, the upper levers 61a, 61a and the lower levers 61b, 61b may have the same length. In FIG. 2, the hoisting machine 36 is shown as one hoisting machine 36 that simultaneously drives two rotating drums 35, but two hoisting machines having one rotating drum 35 are installed and synchronous operation is performed. However, the same action and effect can be obtained. Further, in the above-described embodiment, the handling tool 40 is provided with two hanging ropes 16
I explained about the case of hanging with the rope.
As a book, the hoisting machine, the rope azimuth control device, and the rope compensator can be used for three lifting ropes, but the mechanism becomes complicated compared to the case of hanging two ropes. Stability is improved.

Next, the operation of the above configuration will be described. As shown in FIG. 1, the handling tool 40 attached to the end of the rope compensator 60 is lowered into the reactor pressure vessel 1 by the two hoisting ropes 16 of the hoisting machine 36, and the operation shown in FIG. Of A
After passing the flange 7a of the shroud 7 by aligning the handling tool 40 and the pump component with the positions of the relief recesses 7b of the shroud 7 as shown in the plan view along the line A, the outer peripheral surface of the shroud 7 and the atoms are removed. In the annular space 12 formed by the inner peripheral surface of the furnace pressure vessel 1, it moves in the circumferential direction as shown by the arrow. In this case, the platform 14 and the trolley 15 are moved, and the two ropes 16 are suspended by the rope direction control device 50.
Is rotated around the center of the reactor pressure vessel 1 in the annular space 12 so that the line connecting the two suspension ropes 16 is always aligned in the tangential direction of the shroud 7. By performing this operation, the handling tools 40 are aligned in the tangential direction of the shroud 7 according to the movement of the suspension rope 16.

At this time, even if the suspension rope 16 and the handling tool 40 change their directions, the suspension rope 16 is rotated between the upper rod 61a and the lower rod 61b even if the suspension rope 16 is twisted. As it can be twisted, the direction can be changed smoothly. Next, the suspension rope 16 is the reactor pressure vessel 1.
The guide roller 42 of the handling tool 40 always moves toward the center of the reactor pressure vessel 1, that is, the shroud 7 side, with the flange 1a and the center of the shroud 7 moving in the circumferential direction. Since the handling tool 40 can be controlled by suspending the handling tool 40 with the two hanging ropes 16 via the rope orientation control device 50 and the rotation device 60 in this manner, the handling tool can be easily handled. 40 guide rollers 42 to shroud 7
It is possible to engage with the guide rail 13 in a short time. Further, since the guide roller 42 is always directed toward the center of the reactor pressure vessel 1 during the circumferential movement from above the platform 14, the guide roller 42 is at the stage when the circumferential movement is completed.
42 is in the direction of the guide rail 13, and the guide roller 42 can be immediately engaged with the guide rail 13 without adjusting the rotation direction. In addition, the suspension rope 16 is the reactor pressure vessel 1
By moving the suspension rope 16 in the circumferential direction around the center, there is no problem that the suspending rope 16 interferes with the flange 1a of the reactor pressure vessel 1 and the flange 7a of the shroud 7 protruding inward.

[0019]

As described above, according to the present invention, since the turning direction of the handling tool can be easily controlled by remote control, the working time can be greatly shortened and the radiation exposure dose of the worker can be reduced. effective.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of the periphery of a reactor pressure vessel adopting a component mounting / demounting device for a pump with a built-in reactor according to the present invention.

FIG. 2 is a plan view of the hoisting machine of the present invention.

FIG. 3 is a plan view of the rope azimuth control device of the present invention.

FIG. 4 is a front view of the rope correction device of the present invention.

FIG. 5 is an enlarged configuration diagram of a rope correction device.

FIG. 6 is a plan view taken along line BB of FIG.

FIG. 7 is a plan view taken along the line AA of FIG.

FIG. 8 is a vertical cross-sectional view around the reactor pressure vessel.

FIG. 9 is a vertical sectional view of an internal pump.

FIG. 10 is a vertical cross-sectional view of the periphery of a reactor pressure vessel showing a conventional inspection work.

[Explanation of symbols]

1 ... Reactor pressure vessel, 2 ... Operating floor, 7
... Shroud, 7a ... Flange, 11 ... Internal pump, 12 ... Annular space, 13 ... Guide rail, 14 ... Platform, 15 ... Trolley, 16 ... Suspension rope, 35 ... Rotating drum, 36 ... Hoisting machine, 37 ... Handrail, 40 ... Handling tool, 42 ... Guide roller, 50 ... Rope orientation control device, 51 ... Transverse bearing, 52 ... Circular rail guide, 53 ... Circular rail, 54 ... Pulley,
60 ... rope correction device, 61 ... rotating part, 61a ... upper rod,
61b ... lower rod, 61c ... guide bearing, 61d ... thrust bearing, 62 ... balance part, 62a ... balance bar.

Claims (1)

[Claims] 1. A handling tool provided with an engaging mechanism that engages and disengageably engages with a component of a reactor built-in type pump contained in a reactor pressure vessel, and the handling tool is hung at a plurality of suspension points. A plurality of suspension ropes to be held, a hoisting machine for hoisting and lowering the plurality of suspension ropes on a platform trolley provided on an operating floor laid above the reactor pressure vessel, and the hoisting machine. Rope orientation control means for controlling the orientation of the horizontal plane by inserting it into a plurality of suspension ropes hanging from the machine, and a plurality of suspension ropes that are rotatably supported while supporting each suspension rope provided above the handling tool. A device for attaching / detaching a pump for a built-in-reactor, comprising a rope correction means for adjusting a difference in length of the pump, and controlling the orientation of the handling tool in a target direction.