JPH05188176A - Handling apparatus for internal pump - Google Patents

Abstract

PURPOSE:To facilitate the attachment and the removal of an internal pump in periodic inspection, to detect the attaching position accurately, and to secure the excellent workability and operator's safety. CONSTITUTION:An internal pump handling apparatus comprises a main body 26A of a holding tool, a holding part 30, an air cylinder 32 for driving the holding part 30, a limit switch 41 as a seating detector utilizing a pump deck part 12 and an inserting guide 35, which is protruding from the tip of a stretch tube 18. The inserting guide 35 comprises a guide tip block 37, whose tip part has the tapered shape, and inserting guide rollers 38. The inserting guide rollers 38 can be expanded and contracted in the direction of the diameter of the stretch tube 18 in association with the up and down movement of the holding tool by the actions of guide-shaft driving rollers 40, a linking mechanism 4Ob and a guide shaft 39.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal pump handling device for facilitating the handling of an internal pump during a periodic inspection of a boiling water reactor equipped with an internal pump.

[0002]

2. Description of the Related Art An internal pump is installed in a reactor pressure vessel of a boiling water reactor and is located in an annular portion outside the shroud. This internal pump is maintained and inspected during the periodic inspection of the nuclear power plant, but this handling work is performed by the internal pump handling device.

When inspecting the internal pump, first, the operation of the reactor is stopped, the reactor pressure vessel is filled with water, the radiation is shielded, the upper mirror of the reactor pressure vessel is removed, and the inside of the reactor well is further removed. Also, fill up with water and remove the steam dryer, steam separator, shroud head, etc., and remove the internal pump from the annular part outside the shroud of the reactor pressure vessel. After checking, re-install in the same position.

The respective parts of the internal pump are handled as follows. That is, first, after draining the water in the pump casing, the motor section is removed from below the reactor pressure vessel, and then the impeller and shaft of the internal pump, the diffuser, and the stretch tube are integrated together, and the wear ring is attached. Each is handled individually from above the reactor pressure vessel using its own handling equipment.

FIG. 10 is a view for explaining the structure of a diffuser and a stretch tube (which handles one body) which is one of the conventional internal pump handling devices. This handling device is hung from the refueling cart above the reactor pressure vessel by a suspending tool such as a wire rope.
In FIG. 10, the handling device is shown by a solid line, and the diffuser 17 and the stretch tube 18 are shown by a two-dot chain line (imaginary line). The diffuser and the stretch tube handling device are provided with a grip body 126A and a grip portion 13
0, a slide block 131 that engages with the grip portion 130 through a hook-shaped groove, an air cylinder 132 as a drive member connected to the slide block 131 via a rod 132a, and the air cylinder 132 is turned on / off in response to movement of the air cylinder 132. Grasping detector 133 and release detector 1
34, a limit switch 141a as a seating detector mounted on the plate 126a for detecting seating of the handling device
It is composed of When the handling device is connected to the integrated diffuser and stretch tube, the rod 132a is in the upper position detected by the release detector 134 by the operation of the cylinder 132.
The slide block 131 connected to a is located above the position shown in FIG. 10, that is, above the grip portion 130, and the grip portion 130 is in a contracted state. When gripping the diffuser and stretch tube,
As shown in FIG.
32a is lowered to the lower position detected by the grip detector 133, and the slide block 13 is connected to the rod 132a.
1 is engaged with the grip portion 130 by the hook-shaped groove, and the grip portion 130 is opened. When the grip portion 130 is in the open state, the protrusion 130a of the grip portion 130 and the recess 17a of the diffuser 17 are engaged, and the grip portion 13
0 grabs the diffuser and stretch tube.
When the protrusion 130a of the grip portion 130 and the recess 17a of the diffuser 17 are engaged with each other, there is vertical play between them, so that when suspended, the upper surface of the diffuser 17 and the grip There is a gap between the tool body plate 126a and the plate 126a.

When the internal pump is installed after the inspection, the diffuser and the stretch tube are held by the grip portion 130 of the handling apparatus as described above and suspended from the upper part of the reactor containment vessel (nozzle). Part) and attached to the pump casing. The mounting positions of the diffuser 17 and the stretch tube 18 in this case are detected by the limit switch 141a as follows. That is, since there is the above-described gap between the upper surface of the diffuser 17 and the plate 126a of the grip body in the suspended state,
The limit switch 141a does not detect, but when the diffuser 17 and the stretch tube 18 reach the mounting position in the pump casing, the above-mentioned protrusion 130 is formed.
This gap disappears due to the backlash of the engaging portion between the a and the recess 17a, and the limit switch 141a detects the seating of the diffuser 17 and the stretch tube 18 at the mounting position.

[0007] Documents relating to the above-mentioned handling device include:
For example, JP-A-63-55392 and JP-A-62-9
For example, there is Japanese Patent No. 3693.

[0008]

The problems described below have been encountered in the work of installing and removing the internal pump using the conventional internal pump handling device as described above.

That is, due to the structure of the equipment in the reactor pressure vessel,
Since it is difficult to recognize the nozzle part, which is the mounting position of the internal pump, from the refueling truck installed above the reactor pressure vessel visually or by a submersible television camera,
Handling internal pumps in the reactor pressure vessel was a difficult task. In particular, when installing the diffuser and stretch tube as described above, the dimensional difference between the nozzle tube inner diameter of the reactor pressure vessel, which is the internal pump setting position, and the stretch tube outer diameter is small in terms of its function. A great amount of time may be required for insertion and attachment to the nozzle portion.

The internal pump is installed at a position several tens of meters below the water surface of the water filled in the reactor pressure vessel, and the fuel pump installed above the reactor pressure vessel, which is the working place of the operator. Since the position detector is installed in the feeding mechanism of the internal pump handling device on the replacement cart, it is confirmed that the stretch tube has reached the mounting position due to an error in positioning accuracy when the lifting device is extended (detection). It was difficult to do so, and it took a lot of time to install the internal pump.

Further, when the seating detector is attached to the plate of the grip body as described above, the tip of the stretch tube is positioned inside the nozzle portion while the diffuser and the stretch tube are being inserted into the nozzle portion of the reactor containment vessel. Alternatively, when the pump casing is caught on the inner surface and stopped, the seating detector sometimes detects before the diffuser and the stretch tube reach the correct mounting positions. For this reason, the stretch tube may be subjected to the subsequent work while being incompletely attached, which may cause a problem that the entire internal pump cannot be attached.

Further, the handling work of the internal pump is a very difficult work since it is a remote work with the water filled in the reactor pressure vessel being several tens of meters below the water surface, and the workability is poor. Since it takes a long time, there is a problem that a worker may receive a large dose of radiation.

SUMMARY OF THE INVENTION An object of the present invention is to provide an internal pump handling device in which the internal pump can be easily attached and detached at the time of periodic inspection, the workability is good, and the safety of the operator can be secured.

Another object of the present invention is to provide an internal pump handling device which can detect the mounting position with high accuracy when the internal pump is attached and detached during the periodic inspection, has good workability, and can ensure the safety of the operator. To do.

[0015]

In order to achieve the above object, the present invention provides a grip body that is hung from above a reactor pressure vessel, and an internal pump diffuser and stretch provided on the grip body. A gripping part for gripping the tube, a driving member for moving the gripping part up and down, a guide means connected to the lower part of the gripping part and penetrating the inside of the stretch tube and projecting from the tip, And a guide means that is capable of expanding and contracting in the radial direction of the stretch tube.

[0016] Preferably, the guide means includes a guide tip block having a tapered tip portion, and an insertion guide roller provided in the guide tip block and capable of expanding and contracting in the radial direction of the stretch tube.

Further, preferably, the guide means includes a guide tip block having a tapered tip portion, and an insertion guide finger provided in the guide tip block and capable of expanding and contracting in the radial direction of the stretch tube.

In order to achieve the above object, the present invention provides a seat provided on the grip body for detecting the diffuser and the stretch tube mounting position by sitting on the pump deck portion of the internal pump. It has a detector.

Preferably, a lower closing plate installed from a lower part of the reactor pressure vessel to a lower part of the pump casing of the internal pump, a column installed on the lower closing plate and engaging with an upper part of the pump casing, and the insertion guide. The seating detector is installed at the lower end and seats on the upper end of the column to detect the diffuser and the stretch tube mounting position.

[0020] Preferably, a lower closing plate is installed from a lower part of the reactor pressure vessel to a lower part of the pump casing of the internal pump, a pillar installed on the lower closing plate and engaging with an upper part of the pump casing, The seating detector is installed on the upper end of a column and seated on the lower end of the insertion guide to detect a diffuser of the grip body and a seating position of the stretch tube.

Further, preferably, a lower closing plate installed from a lower portion of the reactor pressure vessel to a lower portion of the pump casing of the internal pump, and a cylinder integrally formed with the lower closing plate and capable of sucking fluid into the inside thereof. A rod that is integrally formed with the piston portion in the cylinder and that can be raised to the upper portion of the pump casing by the fluid in the cylinder;
The seating detector is installed on the lower end of the insertion guide and seated on the upper end of the rod to detect the diffuser of the grip body and the seating position of the stretch tube.

Further, preferably, a lower closing plate installed from a lower portion of the reactor pressure vessel to a lower portion of the pump casing of the internal pump, and a cylinder integrally formed with the lower closing plate and capable of sucking fluid into the inside thereof. A rod that is integrally formed with the piston portion in the cylinder and that can be raised to the upper portion of the pump casing by the fluid in the cylinder;
A seating detector that is installed on the upper end of the rod and seats on the lower end of the insertion guide to detect the diffuser of the grip body and the mounting position of the stretch tube.

[0023]

In the present invention configured as described above, the grip body for suspending the diffuser of the internal pump and the stretch tube is installed in the grip body that is hung from above the reactor pressure vessel, and this grip portion is the driving member. The guide means that is connected to the lower part of the grip part and penetrates the inside of the stretch tube and projects from the tip is expanded and contracted in the radial direction of the stretch tube in conjunction with the vertical movement of the grip part. When inserting the stretch tube into the nozzle of the reactor containment vessel while holding the stretch tube, the guide means can be projected outside the outer diameter of the stretch tube, and this guide means serves as the insertion guide. Insertion can be done while it is in contact with the inner wall, and push-in insertion work It can be in the Meuse.

Further, since the tip end portion of the guide means is a tapered guide tip block, the tip end of the stretch tube can be easily inserted into the nozzle inlet of the reactor pressure vessel, and the guide roller is inserted into the guide tip block. Alternatively, since the insertion guide finger is provided and can be expanded / contracted in the radial direction of the stretch tube, similarly to the above, the work of inserting the diffuser and the stretch tube into the nozzle portion of the reactor containment vessel can be smoothly performed.

Further, since a seating detector for detecting the diffuser and the mounting position of the stretch tube by being seated on the pump deck portion of the internal pump is provided in the grip body, the position of the stretch tube is erroneous before reaching the mounting position. It is possible to confirm that the seat is seated without any detection and without causing an error in the position where the stretch tube is attached, and the reliability and workability of handling the internal pump are improved.

Further, a lower closing plate is installed from a lower part of the reactor pressure vessel to a lower part of the pump casing of the internal pump, and a support column engaging with an upper part of the pump casing of the internal pump is installed to the lower closing plate, and an insertion guide is provided. Since the seating detector installed at the lower end is seated at the upper end of the strut, or the seating detector installed at the upper end of the strut is seated at the lower end of the insertion guide, the diffuser and the stretch tube mounting position are detected, Similar to the above, there is no erroneous detection of the position of the stretch tube before it reaches the mounting position, and there is no error in the mounting position of the stretch tube, you can confirm that you are seated securely, The reliability and workability of handling work are improved.

Further, a lower closing plate integrally formed with a cylinder capable of sucking a fluid is installed in a lower portion of a pump casing of the internal pump from a lower portion of the reactor pressure vessel, and is integrated with a piston portion in the cylinder. The rod of can be raised to the upper part of the pump casing by the action of the fluid in the cylinder, and the seating detector installed at the lower end of the insertion guide is seated on the upper end of the rod, or the seating detector installed at the upper end of the rod is By seating on the lower end of the insertion guide, the diffuser and stretch tube mounting position can be detected.Therefore, similar to the above, before the stretch tube reaches the mounting position, the position is not erroneously detected and there is an error in the stretch tube mounting position. Can be confirmed to be seated securely without causing Reliability and workability of the handling is improved.

[0028]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 9.

First, the structure of the reactor pressure vessel and the outline of the periodic inspection will be described with reference to FIGS. FIG. 2 is a diagram showing the configuration of the reactor pressure vessel. In FIG. 2, a reactor pressure vessel 1 has a shroud 5 for accommodating a fuel assembly 4 directly supported by an upper lattice plate 2 and a core support plate 3, an upper shroud 6 provided on the upper part of the shroud 5, a water-water separation. A shroud head 8 having a reactor 7, a steam dryer 10 located above the steam separator 7, and a reactor pressure vessel upper mirror 11 covering the upper portion of the reactor pressure vessel 1 are provided. An internal pump 13 is provided in the pump deck portion 12 of the outer annular portion of the shroud 5.

FIG. 3 is a view for explaining the internal structure of the internal pump installed reactor from above. The shroud head 8, the steam dryer 10 and the reactor pressure vessel upper mirror 11 are shown.
It is the figure which looked at the inside of the reactor pressure vessel 1 after removing. In FIG. 3, a tightening flange portion 15 having a notch portion 14 is provided on the upper shroud 6 (see FIG. 2), and is a portion where the shroud head 8 (see FIG. 2) is tightened by a shroud head bolt (not shown). is there. Further, the pump deck portion 12 located outside the shroud 5 (see FIG. 2) is provided with a plurality of holes 12a for installing an internal pump, and the internal pump 13 is installed in this hole 12a.

In the above construction, at the time of periodic inspection of the nuclear power plant, the operation of the reactor is first stopped, the reactor pressure vessel 1 is filled with water, the radiation is shielded, and then the reactor pressure vessel upper mirror 11 is removed. Further, the reactor well is filled with water, the steam dryer 10 is removed, and the shroud head 8 having the steam separator 7 is removed. The removal of the shroud head 8 is performed by rotating a shroud head bolt (not shown) to release the flange fastening with the upper shroud 6, and the shroud head bolt is temporarily placed outside the reactor together with the shroud head 8. Placed. After that, replacement of the fuel assembly 4, inspection of the internal pump 13 and the like are performed. It should be noted that the handling work of the internal pump 13 needs to be performed by a remote operation in a narrow space.

Next, the structure of the internal pump and the periodic inspection will be described with reference to FIGS. FIG. 4 is a sectional view showing the structure of the internal pump. As shown in FIG. 4, the internal pump 13 is composed of a pump portion 13a and a motor portion 13b. The pump portion 13a includes an impeller 16, a diffuser 17, a stretch tube 18, a wear ring 19, a shaft 20, and the like, and the impeller 16 is connected to the motor portion 13b via the shaft 20. Further, the diffuser 17 is installed in the pump deck portion 12 and the nozzle portion 1 a below the reactor pressure vessel 1, and the stretch tube 18 is fixed to the diffuser 17. The stretch tube 18 is inserted into the nozzle portion 1 a and the upper portion inside the pump casing 23 below the nozzle portion 1 a, and
It is fixed by a stretch tube nut 18a in the pump casing 23 on the upper side of b. Further, below the stretch tube nut 18a, the secondary seal member 1
8b is provided. On the other hand, the motor unit 13b is composed of a rotor 21, a stator 22 and the like, and is housed in the lower portion of the pump casing 23.

An internal-pump-installed reactor equipped with the internal pump 13 having the above-described structure does not have an external recirculation system like the conventional reactor, so that the piping space inside the reactor containment vessel is reduced. It can be greatly reduced. Further, since the motor portion 13b of the internal pump 13 is housed in the pump casing 23 having excellent watertightness, a sliding type shaft sealing device is not required, and the structure is simple and there is a possibility of leakage of reactor water. Since it is small, it is excellent in safety and reliability. When adopting such an internal-pump-installed nuclear reactor excellent in safety and reliability, it is necessary to regularly perform maintenance and inspection work of the internal pump 132.

FIG. 5 is a view for explaining the work of attaching and detaching the internal pump during the regular inspection work. The removal work of the internal pump 13 is performed in the following procedure. That is, the refueling truck 2 above the reactor pressure vessel 1
4, the internal pump handling device 26 is suspended by a suspender 25 such as a wire rope, and is lowered from the cutout portion 14 (see FIG. 3) of the shroud head bolt fastening flange portion 15 to below the shroud head bolt fastening flange portion 15, The annular portion between the reactor pressure vessel 1 and the shroud 5 is horizontally rotated to a position immediately above a predetermined pump setting position. The internal pump handling device 26, which has been moved to a position immediately above a predetermined pump setting position, uses a guide roller (not shown) installed on the internal pump handling device 26 and a rail 27 provided on the shroud 5, and the pump deck portion 12 and It descends to the position of the internal pump 13 attached to the nozzle portion 1a, grasps the parts of the internal pump 13, and pulls up above the reactor pressure vessel 1. The handling work of the internal pump 13 is performed not only from above the reactor pressure vessel 1 but also from below. However, at that time, as shown in the figure, the handling jig 28 is used to
Remove 3b, etc.

Hereinafter, a method of removing each part of the internal pump 13 will be described. First, after draining the water in the pump casing 23, the motor unit 13b is removed from below the reactor pressure vessel 1. Next, the pump casing 2
After the flange portion 3 is closed to prevent the reactor water from flowing out, the impeller 16 and the shaft 20 are integrally removed from above the reactor pressure vessel 1. Next, the wear ring 19 is independently removed, the opening of the diffuser 17 is closed, the reactor water in the pump casing 23 is drained, and the secondary seal member 18b and the stretch tube nut 18a are removed from below the reactor pressure vessel 1. Next, the flange portion of the pump casing 23 is closed to prevent the reactor water from flowing out, and then the diffuser 17 and the stretch tube 18 are integrally removed from above the reactor pressure vessel 1. Incidentally, the impeller 16 and the shaft 20, the diffuser 17 and the stretch tube 18 are integrally handled, and the wear ring 19 is handled independently by using a dedicated handling device. Further, the installation work of the internal pump is performed in the reverse order of the above-mentioned removal work.

Next, the structure and operation of the internal pump according to one embodiment of the present invention will be described with reference to FIGS. 1 and 6. FIG. 1 is a view for explaining the structure of an internal pump handling device according to the present embodiment (which handles a diffuser and a stretch tube as one body). In FIG. 1, the handling device is shown by a solid line, and the diffuser 17 and the stretch tube 18 are shown by a two-dot chain line (imaginary line). In FIG. 1, an internal pump handling device 26
Has a grip body 26A and a protrusion 36a engageable with the recess 17a on the inner surface of the diffuser 17, and the support member 36.
b gripping portion 30 supported by b, slide block 31 engaging the gripping portion 30 with a hook-shaped groove, air cylinder 32 as a driving member connected to slide block 31 via rod 32a, movement of air cylinder 32 It comprises a grip detector 33 and a release detector 34 which are turned on and off respectively, and an insertion guide 35 which penetrates the inside of the stretch tube 18 and protrudes from the tip of the stretch tube and is expandable and contractible in the radial direction of the stretch tube.

The insertion guide 35 is connected to the support member 30b of the grip portion 30 via a sleeve 36, and a guide tip block 37 having a tapered tip end, and an insertion guide roller 38 extensiblely connected to the guide tip block 37. The guide shaft 39 is connected to the upper portion of the insertion guide roller 38, and the guide shaft 39 is further provided with a spring 40.
It is connected to the lower end of the support member 30b of the grip portion 30 via a. Further, a guide shaft drive roller 40 is connected to the upper portion of the guide shaft 39 by a link mechanism 40b, and the insertion guide roller 38 of the grip 30 is operated by the action of the guide shaft drive roller 40, the link mechanism 40b and the guide shaft 39. The stretch tube 18 can be expanded and contracted in the radial direction in conjunction with the grasping operation (vertical movement).

Further, similarly to the conventional internal pump handling device, a limit switch 41a is attached as a seating detector to the plate 26a of the grip body 26, and when the limit switch 41a is seated on the diffuser 17, the diffuser 17 and the stretch tube 18 are mounted. Detects that the mounting position has been reached. In addition to this, a limit switch 41 is attached as a seating detector to the tip of the L-shaped plate 26b of the grip body 26A, and the limit switch 41 is seated on the pump deck portion 12, whereby the diffuser 1
It is detected that 7 and the stretch tube 18 have reached the attachment position.

Since there is looseness between the projection 30a of the grip 30 and the engaging portion of the recess 17a of the diffuser 17, the upper surface of the diffuser 17 and the plate 26a of the grip body are suspended. There is a gap between them.

Next, the operation of the internal pump handling device 26 configured as described above will be described. When the handling device is connected to the diffuser 17 and the stretch tube 18 which are integrated, as shown in FIG. 2, the rod 32a is in the upper position detected by the release detector 34 by the operation of the cylinder 32. The slide block 31 connected to the above is separated from the grip portion 30 at a position higher than the grip portion 30, and the grip portion 30 is in a contracted state.
Is located slightly above the recess 17a. At this time, the guide shaft drive roller 40 is in the open state at the upper end position of the stretch tube 18, and the guide shaft 39 is pulled up by the contracting force of the spring 40a, so that the guide shaft 3
The insertion guide roller 38 connected to the connector 9 is housed in the guide tip block 37 and is in a contracted state. Therefore, the insertion guide 35 connected from the lower end of the grip portion 30 via the sleeve 36 can pass through the inside of the stretch tube, and the tip of the insertion guide 35 can be projected from the tip of the stretch tube 18. Further, since the tip portion of the guide tip block has a tapered shape, the stretch tube 18 can be easily inserted into the nozzle portion 1a below the reactor pressure vessel 1 where the stretch tube 18 is attached.

Next, the grasping operation of the diffuser 17 and the stretch tube 18 which are integrated is performed. That is,
By operating the cylinder 32, the rod 32a is lowered to the lower position detected by the grip detector 33, and the slide block 31 connected to the rod 32a is lowered to engage the grip portion 30 with the hook-shaped groove, Part 30
Goes down and opens. As a result, the protrusion 30a of the grip 30 and the recess 17a of the diffuser 17 are engaged with each other, and the grip 30 grips the diffuser 17 and the stretch tube 18. At this time, the guide shaft drive roller 40 is inserted into the stretch tube 18 and is compressed inside the stretch tube 18 in conjunction with the lowering operation of the grip portion 30, and the spring 40a is extended and the link mechanism 40b acts to push down the guide shaft 39. .. As a result, the insertion guide roller 38 connected to the guide shaft 39 projects from the guide tip block 37 and projects outward in the radial direction from the outer diameter of the stretch tube 18. Therefore, in the subsequent push-insertion operation of the diffuser 17 and the stretch tube 18 which are integrated into the inside of the nozzle portion 1a, the insertion guide roller 38 protruding outside the outer diameter of the stretch tube 18 as described above is used. 1a
Since it contacts the inner wall and serves as an insertion guide, the insertion operation can be performed smoothly.

The detection of the mounting positions of the diffuser 17 and the stretch tube 18 by the limit switch 41a is performed as follows, as in the conventional case. That is, since there is a gap between the upper surface of the diffuser 17 and the plate 26a of the grip body in the suspended state, the limit switch 41a does not detect, but the diffuser 17 and the stretch tube 18 are mounted inside the pump casing. When the position is reached, the above-mentioned protrusion 36a and recess 1
This gap disappears due to the play of the engaging portion of 7a, and the limit switch 41a detects the attachment position of the diffuser 17 and the stretch tube 18.

Further, the limit switch 41 also detects the mounting positions of the diffuser 17 and the stretch tube 18. That is, when the diffuser 17 and the stretch tube 18 reach the attachment position, the limit switch 41 installed on the L-shaped plate 26b of the grip body 26A is seated on the upper surface of the pump deck portion 12,
As a result, the limit switch 41 detects the attachment positions of the diffuser 17 and the stretch tube 18. Since the limit switch 41 is not affected by the stretching of the lifting device, it is possible to proceed with the work reliably and easily while confirming that the diffuser 17 and the stretch tube 18 have reached the attachment position. Further, before the stretch tube 18 reaches the mounting position, the position thereof is not erroneously detected and the mounting position does not have an error, and the reliability and workability of the handling work of the internal pump are improved.

According to the present embodiment, the insertion guide roller 38, which is connected to the lower portion of the grip portion 30 via the guide shaft 39, projects from the distal end of the stretch tube 18 in conjunction with the lowering operation of the grip portion 30. Since it extends outward in the radial direction, when the stretch tube 18 is pushed into the inside 1a of the nozzle portion 1a of the reactor containment vessel 1 with the grip portion 30 holding the diffuser 17 and the stretch tube 18, this insertion guide roller 38 The insertion can be performed while being in contact with the inner wall of the nozzle portion 1a as an insertion guide, and the push-in insertion work can be performed smoothly.

Further, since the tip portion of the guide tip block 37 has a tapered shape, the diffuser 1 is used in the present handling device.
It is possible to easily insert the lower end of the stretch tube 18 into the inlet of the inside 1a of the nozzle portion while grasping the stretch tube 7 and the stretch tube 18. Further, a limit switch 41 for detecting the attachment positions of the diffuser 17 and the stretch tube 18 by sitting on the pump deck portion 12
Since the stretch tube 18 is provided, the seat can be surely seated without erroneously detecting the position of the stretch tube 18 before reaching the mounting position and without causing an error in the mounting position of the stretch tube 18.

Therefore, the internal pump can be easily attached even in remote work several tens of meters below the surface of the water, and the workability is improved. Therefore, the internal pump can be handled in a short time, and the operator can It is also possible to reduce the radiation dose received by.

Next, an internal pump handling device according to another embodiment of the present invention will be described with reference to FIG. Figure 7
The structure of the internal pump handling device shown in (1) is the same as that shown in FIG. 1 except that the structures of the insertion guide and its connecting portion are different. In FIG. 7, the insertion guide 35a is connected to the support member 30b of the grip portion 30 via a sleeve 36a, and the distal end portion is a tapered guide tip block 37a, and the insertion guide finger is telescopically coupled to the guide tip block 37a. 38a, a finger slide block 38b that engages with the insertion guide finger 38a through a hook-shaped groove. A guide shaft 39a is connected to the upper portion of the finger slide block 38b. Further, the guide shaft 39a is attached to the lower end of the support member 30b of the grip portion 30. It is connected. The insertion guide finger 38a is in a contracted state when the finger slide block 38b is apart from the upper position, and the finger slide block 38b is lowered to the insertion guide finger 38a.
And engages through a keyed groove that opens in the radial direction of the stretch tube. That is, the insertion guide finger 38a is expandable / contractible in the radial direction of the stretch tube in conjunction with the vertical movement of the gripper 30, similarly to the insertion guide roller 38 in the embodiment shown in FIG. According to this embodiment, the same effect as that of the embodiment shown in FIG. 1 can be obtained.

Next, an internal pump handling device according to still another embodiment of the present invention will be described with reference to FIG. As shown in FIG. 8, in this embodiment, in addition to the internal pump handling device shown in FIG. 1, the following configuration is further added. That is, the limit switch 50 is installed as a seating detector on the guide tip block 37, and after the motor portion 13b is removed, the main flange stud 51 and the stud nut 52 are used to move from the lower portion of the reactor pressure vessel to the pump casing 23 of the internal pump. The lower closing plate 53 is installed on the lower part, and the support 54 is attached to the lower closing plate 53.
Is installed so as to engage with the pump casing upper portion 23a, and the O-ring 55 is installed at an engaging portion between the flange portion 54a on the upper portion of the column 54 and the pump casing upper portion 23a.
In such a configuration, when the diffuser 17 and the stretch tube 18 reach the mounting position, the limit switch 50 installed at the lower end of the guide tip block 37
Is seated on the flange portion 54a on the upper portion of the column 54, the attachment positions of the diffuser 17 and the stretch tube 18 are detected.

According to this embodiment, the same effect as that of the embodiment shown in FIG. 1 can be obtained. The limit switch 50
May be installed on the flange portion 54a instead of the lower end of the guide tip block 37 as described above. In this case, the detection of the attachment positions of the diffuser 17 and the stretch tube 18 is confirmed from the lower part of the reactor pressure vessel 1. Moreover, you may add the above structures to the internal pump handling apparatus shown in FIG.

Next, an internal pump handling device according to still another embodiment of the present invention will be described with reference to FIG. As shown in FIG. 9, in this embodiment, the following configuration is further added to the internal pump handling device shown in FIG. That is, after removing the motor portion 13b,
A lower closure plate 63 is installed from the lower part of the reactor pressure vessel to the lower part of the pump casing 23 of the internal pump by the main flange stud 61 and the stud nut 62.
A cylinder 64 capable of sucking fluid is integrally formed inside the lower closing plate 63, and a rod 65 integrated with the piston portion 65a is installed above the cylinder 64.
By supplying a fluid such as air from the hose 66 into the cylinder 64, the rod 65 can rise to the upper portion of the pump casing. The elevated position of the rod 65 is set by the piston portion 65a and the collar 67 so as to have a predetermined height. A flow path 68 is provided above the cylinder 64 and serves as a drainage hole for the fluid when the fluid is inserted from the hose 66, and supplies water through the flow path 68 when the fluid is not inserted from the hose 66. It becomes a water injection hole for lowering the rod 65 by the hydraulic head pressure. Rod 65
A limit switch 60 is installed as a seating detector on the upper surface of the table 65b at the upper end, and a signal from the limit switch 60 is connected to a seating indicator (not shown) below the reactor pressure vessel 1 through a cable 69.

In such a structure, when the diffuser 17 and the stretch tube 18 reach the mounting position, the limit switch 60 installed on the upper surface of the table 65b at the upper end of the rod 65 is seated at the lower end of the guide tip block 37, so that the diffuser is seated. The attachment positions of 17 and the stretch tube 18 are detected. The confirmation of the attachment position detection is performed from the lower portion of the reactor pressure vessel 1 through the cable 69.

According to this embodiment, the same effect as that of the embodiment shown in FIG. 1 can be obtained. The limit switch 60
May be installed at the lower end of the guide tip block 37 instead of the upper surface of the table 65b at the upper end of the rod 65 as described above. In this case, the detection of the attachment positions of the diffuser 17 and the stretch tube 18 is confirmed from the upper part of the reactor pressure vessel 1. Moreover, you may add the above structures to the internal pump handling apparatus shown in FIG.

Further, the table 65b at the upper end of the rod 65 is sized and shaped to be engageable with the diffuser 17 of the pump casing 23 and the lower end of the position where the stretch tube 18 is attached, and the table 65b is engaged with the lower end of the stretch tube 18 to cause the diffuser 17 It is also possible to directly detect the attachment position of the stretch tube 18. In such a case, the limit switch 60 can be omitted.

[0054]

According to the present invention, in the internal pump handling apparatus, the guide means which is connected to the lower portion of the grip portion and penetrates the inside of the stretch tube and projects from the distal end is interlocked with the vertical movement of the grip portion. Since it expands and contracts in the radial direction, the guide means overhangs the outside diameter of the stretch tube when inserting the stretch tube into the nozzle of the reactor containment vessel while holding the diffuser and stretch tube with the grip. As a guide, it can be inserted while it is in contact with the inner wall of the nozzle, and the insertion work can be done smoothly.

Further, since the guide tip block at the tip of the guide means is tapered, the tip of the stretch tube can be easily inserted into the nozzle inlet of the reactor pressure vessel, and the guide roller is inserted into the guide tip block. Alternatively, since the insertion guide finger is provided and can be expanded / contracted in the radial direction of the stretch tube, similarly to the above, the work of inserting the diffuser and the stretch tube into the nozzle portion of the reactor containment vessel can be smoothly performed.

Further, since the seating detector utilizing the pump deck portion of the internal pump is provided, it is possible to confirm that the diffuser and the stretch tube are securely attached without causing an erroneous detection of the attachment position or an error in the attachment position. It can be confirmed, and the reliability and workability of the internal pump handling work are improved.

Further, a lower closing plate and a support are installed from the lower part of the reactor pressure vessel to the lower part of the pump casing of the internal pump, and the seating detector installed at the lower end of the insertion guide is seated at the upper end of the support, or The seating detector installed on the upper end of the column detects the mounting position of the diffuser and the stretch tube by seating on the lower end of the insertion guide. It is possible to confirm that the internal pump is securely attached without causing an error, and the reliability and workability of the handling work of the internal pump are improved.

Further, a lower closing plate integrally formed with the cylinder is installed from the lower part of the reactor pressure vessel to the lower part of the pump casing of the internal pump, and the rod integrated with the piston part of the cylinder is connected to the upper part of the pump casing by the cylinder. The seating detector installed at the lower end of the insertion guide is seated at the upper end of the rod, or the seating detector installed at the upper end of the rod is seated at the lower end of the insertion guide. Since the mounting position is detected, it is possible to confirm that the diffuser and the stretch tube are mounted correctly without causing erroneous detection of the mounting position of the diffuser and stretch tube, and no error in the mounting position. Reliability and workability are improved.

Therefore, the internal pump can be easily installed even in remote work of several tens of meters below the water surface, and the workability is improved. Therefore, the internal pump can be handled in a short time, and the operator can It is also possible to reduce the radiation dose received by.

[Brief description of drawings]

FIG. 1 is a view for explaining the structure of an internal pump handling device according to an embodiment of the present invention, and is a view showing a state in which an integrated diffuser and stretch tube are inserted into a nozzle portion.

FIG. 2 is a diagram showing an internal configuration of a reactor pressure vessel of an internal pump installed type reactor.

3 is a view from above of the reactor pressure vessel shown in FIG. 2 after the shroud head, the steam dryer and the reactor pressure vessel upper mirror have been removed.

FIG. 4 is a cross-sectional view showing the structure of an internal pump.

FIG. 5 is a diagram illustrating an internal pump attachment / detachment operation during a periodic inspection operation.

FIG. 6 is a diagram showing a state when the internal pump handling device shown in FIG. 1 is connected to an integrated diffuser and stretch tube.

FIG. 7 is a view showing a structure of an internal pump handling device according to another embodiment of the present invention, showing a state when the integrated diffuser and stretch tube are inserted into the nozzle portion.

FIG. 8 is a view showing the structure of an internal pump handling device according to still another embodiment of the present invention.

FIG. 9 is a view showing the structure of an internal pump handling device according to still another embodiment of the present invention.

FIG. 10 is a view showing a structure of a conventional internal pump handling device, and is a view showing a state in which an integrated diffuser and stretch tube are inserted into a nozzle portion.

[Explanation of symbols]

 1 Reactor Pressure Vessel 1a Nozzle Part 12 Pump Deck Part 13 Internal Pump 17 Diffuser 18 Stretch Tube 26 Internal Pump Handling Device 26A Grip Tool Body 30 Grip Section 35 Insertion Guide 32 Air Cylinder 36 Sleeve 37 Guide Tip Block 38 Insertion Guide Roller 38a Insertion guide finger 39 Guide shaft 40 Guide shaft drive roller 40a Spring 40b Link mechanism 41, 50, 60 Limit switch 53, 63 Lower closing plate 54 Strut 54a Flange portion 64 Cylinder 65 Rod 65a Piston portion 65b Table

Claims (8)

[Claims] 1. A grip body that is hung from above a reactor pressure vessel, a grip portion that is provided on the grip body and that grips a diffuser and a stretch tube of an internal pump, and a drive member that moves the grip portion up and down. And guide means that is connected to the lower portion of the grip portion and that penetrates the inside of the stretch tube and that can project from the tip, and that is capable of expanding and contracting in the radial direction of the stretch tube in conjunction with the vertical movement of the grip portion. An internal pump handling device characterized by having. 2. The guide means includes a guide tip block having a tapered tip portion, and an insertion guide roller provided in the guide tip block and capable of expanding and contracting in the radial direction of the stretch tube. The internal pump handling device according to claim 1. 3. The guide means includes a guide tip block having a tapered tip, and an insertion guide finger provided in the guide tip block and expandable and contractible in a radial direction of the stretch tube. Claim 1
Internal pump handling device described. 4. The grip body is further provided on the grip body,
The internal pump handling according to any one of claims 1 to 3, further comprising a seating detector that detects a mounting position of the diffuser and the stretch tube by seating on a pump deck portion of the internal pump. apparatus. 5. Further, a lower closing plate installed from a lower part of a reactor pressure vessel to a lower part of a pump casing of the internal pump, a pillar installed on the lower closing plate and engaging with an upper part of the pump casing, and the insertion. The internal pump according to any one of claims 1 to 3, further comprising a seating detector that is installed at a lower end of a guide and is seated on an upper end of the column to detect the diffuser and the stretch tube mounting position. Handling equipment. 6. Further, a lower closing plate installed from a lower part of a reactor pressure vessel to a lower part of a pump casing of the internal pump, a pillar installed on the lower closing plate and engaging with an upper part of the pump casing, and the pillar. The seating detector for detecting the diffuser of the grip body and the mounting position of the stretch tube by being installed on the upper end and seated on the lower end of the insertion guide, and a seating detector according to any one of claims 1 to 3. Internal pump handling device. 7. A lower closing plate installed from a lower part of a reactor pressure vessel to a lower part of a pump casing of the internal pump, a cylinder integrally formed with the lower closing plate and capable of sucking a fluid therein, A rod formed integrally with a piston part in a cylinder and capable of being lifted to the upper part of the pump casing by a fluid in the cylinder, and a diffuser and a stretch of the grip body by being installed on a lower end of the insertion guide and seated on an upper end of the rod. An internal pump handling device according to any one of claims 1 to 3, further comprising a seating detector for detecting a tube mounting position. 8. A lower closing plate installed from a lower part of a reactor pressure vessel to a lower part of a pump casing of the internal pump, a cylinder integrally formed with the lower closing plate and capable of sucking fluid into the inside, A rod formed integrally with a piston portion in a cylinder and capable of being lifted to an upper portion of the pump casing by a fluid in the cylinder; and a diffuser and a stretch of the grip body, which are installed at an upper end of the rod and are seated at a lower end of the insertion guide. An internal pump handling device according to any one of claims 1 to 3, further comprising a seating detector for detecting a tube mounting position.