JP3153308B2 - Internal pump handling equipment - Google Patents

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 apparatus which facilitates 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 a shroud. The internal pump is maintained and inspected during a periodic inspection of the nuclear power plant, and this handling operation is performed by an internal pump handling device.

[0003] When inspecting the internal pump, first, the operation of the reactor is stopped, the reactor pressure vessel is filled with water, radiation is shielded, the upper mirror of the reactor pressure vessel is removed, and the reactor well is further removed. Fill with water and remove the steam dryer, steam-water separator, shroud head, etc., and remove the internal pump from the annular part of the reactor pressure vessel outside the shroud. After the inspection, re-attach it to the same position.

[0004] Each component of the internal pump is 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 respectively integrated, and the wear ring is also mounted. Handle independently from above the reactor pressure vessel using dedicated handling equipment.

FIG. 10 is a view for explaining the structure of a diffuser and a stretch tube (one body) handling apparatus which is one of conventional internal pump handling apparatuses. This handling device is hung from a refueling trolley above the reactor pressure vessel by a hanging tool such as a wire rope.
In FIG. 10, the handling device is indicated by a solid line, and the diffuser 17 and the stretch tube 18 are indicated by a two-dot chain line (imaginary line). The diffuser and the stretch tube handling device include a gripper body 126A, a gripper 13
0, a slide block 131 engaged with the grip portion 130 by a key-shaped groove, an air cylinder 132 as a driving member connected to the slide block 131 via a rod 132a, and turned on / off in response to movement of the air cylinder 132, respectively. Grasping detector 133 and free detector 1
34, a limit switch 141a attached to the plate 126a and serving as a seating detector for detecting the 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 which is detected by the release detector 134 by the operation of the cylinder 132.
The slide block 131 connected to “a” is located at a position higher than the position shown in FIG. 10, that is, at a position higher than the grip portion 130, and the grip portion 130 is in a contracted state. When the diffuser and stretch tube are grasped,
As shown in FIG.
32a is lowered to the lower position detected by the grip detector 133, and the slide block 13 connected to the rod 132a
1 engages with the grip portion 130 by the key-shaped groove, and the grip portion 130 is opened. When the grip 130 is opened, the protrusion 130a of the grip 130 and the recess 17a of the diffuser 17 are engaged, and the grip 13
0 grabs the diffuser and stretch tube.
When the projection 130a of the grip 130 and the recess 17a of the diffuser 17 are engaged with each other, play is provided in the vertical direction between the two. Therefore, when suspended, the upper surface of the diffuser 17 is gripped with the upper surface of the diffuser 17. There is a gap between the component body and the plate 126a.

When the internal pump is mounted after the inspection, the diffuser and the stretch tube are gripped by the grip 130 of the present handling device as described above, and are suspended from the upper part of the containment vessel. Part) and attached to the pump casing. In this case, the mounting positions of the diffuser 17 and the stretch tube 18 are detected by the limit switch 141a as follows. In other words, in the suspended state, there is a gap as described above between the upper surface of the diffuser 17 and the plate 126a of the gripper body,
The limit switch 141a does not perform detection, but when the diffuser 17 and the stretch tube 18 reach the mounting position in the pump casing, the above-described protrusion 130
This gap is eliminated by the action of the play of the engaging portion between the a and the concave portion 17a, and the limit switch 141a detects that the diffuser 17 and the stretch tube 18 are seated at the mounting positions.

[0007] As a document concerning the above-mentioned handling device,
For example, JP-A-63-55392, JP-A-62-9
No. 3693 and the like.

[0008]

The following problems have been encountered in the operation of attaching and detaching 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,
Because it is difficult to recognize the nozzle part, which is the mounting position of the internal pump, from the refueling trolley installed above the reactor pressure vessel visually or by an underwater television camera, etc.
Handling internal pumps in the reactor pressure vessel was a difficult task. In particular, since the dimensional difference between the inner diameter of the nozzle portion of the reactor pressure vessel, which is the internal pump setting position, and the outer diameter of the stretch tube is small in terms of its function, the installation of the diffuser and the stretch tube is particularly difficult. In some cases, it takes a lot of time to insert and install the nozzle.

[0010] The internal pump is installed at a position several tens meters below the surface of the water filled in the reactor pressure vessel, and the fuel pump installed above the reactor pressure vessel, which is a work place for the operator. Since the position detector is provided in the internal pump handling device delivery mechanism on the replacement trolley, if the hanger extends, an error occurs in the positioning accuracy, and it is confirmed that the stretch tube has reached the mounting position (detection). In some cases, it is difficult to install the internal pump, and it takes a lot of time to install the internal pump.

In the case where the seating detector is attached to the plate of the gripper body as described above, the tip of the stretch tube may be in contact with the inner surface of the nozzle during the insertion of the diffuser and the stretch tube into the nozzle of the containment vessel. Alternatively, if the pump is stopped by being hooked on the inner surface of the pump casing, the seating detector may perform detection before the diffuser and the stretch tube reach the correct mounting position. For this reason, the subsequent operation is performed while the stretch tube is in an incompletely mounted state, and there has been a problem that the entire internal pump cannot be mounted.

The operation of handling the internal pump is very difficult due to remote operation at several tens meters below the surface of the water filled in the reactor pressure vessel, and the workability is poor. Since it takes a long time, there is a problem that the worker may receive a large exposure dose.

An object of the present invention is to provide an internal pump handling apparatus which can easily attach and detach an internal pump during a periodic inspection, has good workability, and can ensure the safety of workers.

Another object of the present invention is to provide an internal pump handling device which can accurately detect an installation position when an internal pump is attached and detached during a periodic inspection, has good workability, and can ensure the safety of workers. Is to do.

[0015]

In order to achieve the above object, the present invention provides a gripper body suspended from above a reactor pressure vessel, and a diffuser and a stretcher for an internal pump provided on the gripper body. A gripping portion for gripping a tube, a driving member for vertically moving the gripping portion, and guide means connected to a lower portion of the gripping portion and penetrating through the inside of the stretch tube and protruding from the tip, wherein the vertical movement of the gripping portion conjunction with possess the extendable guide means in a radial direction of said stretch tube, wherein
The guide means is a guide tip block with a tapered tip.
And the strain provided in the guide tip block.
With an insertion guide roller that can expand and contract in the radial direction of the
including.

[0016]

[0017]

Further, in order to achieve the above object, the present invention provides a gripping device which is suspended from above a reactor pressure vessel.
An internal pump provided on the body and the gripper body
Grab the diffuser and stretch tube
A grip portion, a driving member for vertically moving the grip portion, and
The stretch tube is connected to the lower part of the grip
Guide means which can penetrate and protrude from the tip,
The diameter of the stretch tube in conjunction with the vertical movement of the bite
A guide means that is capable of extending and contracting in the direction, and is further provided on the gripper main body, and a seating detector that detects the diffuser and the stretch tube mounting position by sitting on a pump deck portion of the internal pump. Have.

Further , in order to achieve the above object, the present invention
Is a gripper that is suspended from above the reactor pressure vessel.
An internal pump provided on the body and the gripper body
Grab the diffuser and stretch tube
A grip portion, a driving member for vertically moving the grip portion, and
The stretch tube is connected to the lower part of the grip
Guide means which can penetrate and protrude from the tip,
The diameter of the stretch tube in conjunction with the vertical movement of the bite
A lower closing plate installed at a lower part of a pump casing of the internal pump from a lower part of the reactor pressure vessel , and a guide means installed at the lower closing plate and connected to an upper part of the pump casing. And a seating detector that is installed at the lower end of the insertion guide and that sits on the upper end of the post to detect the positions where the diffuser and the stretch tube are attached.

Further, in order to achieve the above object, the present invention
Is a gripper that is suspended from above the reactor pressure vessel.
An internal pump provided on the body and the gripper body
Grab the diffuser and stretch tube
A grip portion, a driving member for vertically moving the grip portion, and
The stretch tube is connected to the lower part of the grip
Guide means which can penetrate and protrude from the tip,
The diameter of the stretch tube in conjunction with the vertical movement of the bite
A lower closing plate installed at a lower part of a pump casing of the internal pump from a lower part of the reactor pressure vessel , and a guide means installed at the lower closing plate and connected to an upper part of the pump casing. And a seating detector that is installed at the upper end of the post and sits on the lower end of the insertion guide to detect the position where the diffuser and stretch tube of the gripper body are attached.

Further, in order to achieve the above object, the present invention
Is a gripper that is suspended from above the reactor pressure vessel.
An internal pump provided on the body and the gripper body
Grab the diffuser and stretch tube
A grip portion, a driving member for vertically moving the grip portion, and
The stretch tube is connected to the lower part of the grip
Guide means which can penetrate and protrude from the tip,
The diameter of the stretch tube in conjunction with the vertical movement of the bite
And a stretchable guide means in the direction, further, a lower closure plate to be installed from the reactor pressure vessel bottom to a pump casing lower portion of the internal pump, the fluid therein is formed integrally with the lower closure plate An inhalable cylinder,
A rod formed integrally with the piston portion in the cylinder and capable of ascending to the upper part of the pump casing by the fluid in the cylinder; and a diffuser for the gripper body by being installed at the lower end of the insertion guide and seated on the upper end of the rod. A seating detector for detecting a stretch tube mounting position.

In order to achieve the above object, the present invention
Is a gripper that is suspended from above the reactor pressure vessel.
An internal pump provided on the body and the gripper body
Grab the diffuser and stretch tube
A grip portion, a driving member for moving the grip portion up and down,
The stretch tube is connected to the lower part of the grip
Guide means which can penetrate and protrude from the tip,
The diameter of the stretch tube in conjunction with the vertical movement of the bite
And a stretchable guide means in the direction, further, a lower closure plate to be installed from the reactor pressure vessel bottom to a pump casing lower portion of the internal pump, the fluid therein is formed integrally with the lower closure plate An inhalable cylinder,
A rod which can be raised to the pump casing top by the fluid of the piston portion and is formed integrally in the cylinder within the cylinder, diffuser and stretch of the gripper body by sitting on insertion guide lower end is installed in the rod upper end A seating detector for detecting a tube mounting position.

[0023]

In the present invention constructed as described above, a grip portion for gripping a diffuser and a stretch tube of an internal pump is installed in a gripping tool body suspended from above a reactor pressure vessel, and this gripping portion is driven by a driving member. By moving the guide means connected to the lower part of the grip part and penetrating the inside of the stretch tube and projecting from the tip in the radial direction of the stretch tube in conjunction with the vertical movement of the grip part, the diffuser and the diffuser at the grip part During the insertion work of pushing the stretch tube into the nozzle section of the containment vessel while holding the stretch tube, the guide means can protrude outside the outer diameter of the stretch tube, and this guide means serves as the insertion guide as the nozzle section. Insertion can be performed while in contact with the inner wall. It can be in the Meuse.

Also, since the distal end of the guide means is a tapered guide distal block, the distal end of the stretch tube can be easily inserted into the nozzle inlet of the reactor pressure vessel. As described above, since the elastic member can be expanded and contracted in the radial direction of the stretch tube, the diffuser and the stretch tube can be smoothly inserted into the nozzle portion of the containment vessel by pushing the diffuser and the stretch tube in the same manner as described above.

Further, since the gripper main body is provided with a seating detector for detecting the positions where the diffuser and the stretch tube are attached by sitting on the pump deck of the internal pump, the position of the stretch tube may be erroneously adjusted before reaching the attachment position. It is possible to confirm that the seat has been seated without any detection and without causing an error in the mounting position of the stretch tube, thereby improving the reliability and workability of the internal pump handling operation.

Further, a lower closing plate is installed below the reactor pressure vessel below the pump casing of the internal pump, and a column engaging with the upper pump casing of the internal pump is installed on the lower closing plate. Since the seating detector installed at the lower end sits on the upper end of the support, or the seating detector installed on the upper end of the supporter sits on the lower end of the insertion guide, the diffuser and the stretch tube mounting position are detected. In the same manner as above, the position of the stretch tube is not erroneously detected before reaching the mounting position, and there is no error in the mounting position of the stretch tube. The reliability and workability of handling work are improved.

A lower closing plate integrally formed with a cylinder capable of sucking a fluid therein is installed below the reactor pressure vessel and below the pump casing of the internal pump, and is integrally formed with a piston portion in the cylinder. The rod of the cylinder 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 Since the diffuser and stretch tube mounting position are detected by sitting at the lower end of the insertion guide, the position of the stretch tube is not erroneously detected before the stretch tube reaches the mounting position as described above, and there is no error in the mounting position of the stretch tube. Can be confirmed without any trouble, and the internal pump can be confirmed. Reliability and workability of the handling is improved.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

First, the configuration 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 containing 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, and a gas-water separator. 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 part 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 reactor from above the internal pump-installed reactor. The shroud head 8, the steam dryer 10 and the upper mirror 11 of the reactor pressure vessel are shown.
FIG. 2 is a view of the inside of the reactor pressure vessel 1 after removal from the upper view. In FIG. 3, a fastening 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 fastened by a shroud head bolt (not shown). is there. The pump deck 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 the holes 12a.

In the above configuration, during the periodic inspection of the nuclear power plant, the operation of the reactor is first stopped, the reactor pressure vessel 1 is filled with water, radiation is shielded, and then the reactor pressure vessel upper mirror 11 is removed. Then, the steam dryer 10 is removed by filling the reactor well with water, 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 fastening of the flange with the upper shroud 6, and the shroud head bolt is temporarily moved out of the reactor together with the shroud head 8. Is placed. Thereafter, replacement of the fuel assembly 4, inspection of the internal pump 13, and the like are performed. The operation of handling the internal pump 13 must be performed in a small space by remote control.

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

Since the internal pump-installed reactor equipped with the internal pump 13 having the above configuration does not have an external recirculation system unlike the conventional reactor, the piping space in the reactor containment vessel is reduced. Can be significantly 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 reactor water leakage. Excellent in safety and reliability due to small amount. When adopting such an internal pump-installed nuclear reactor having excellent safety and reliability, it is necessary to periodically perform maintenance work on the internal pump 132.

FIG. 5 is a view for explaining the work of attaching and detaching the internal pump during the periodic inspection work. The operation of removing the internal pump 13 is performed in the following procedure. That is, the refueling trolley 2 above the reactor pressure vessel 1
4, the internal pump handling device 26 is suspended by a suspending tool 25 such as a wire rope, and is lowered from the notch 14 (see FIG. 3) of the shroud head bolt fastening flange 15 below the shroud head bolt fastening flange 15. An 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 moved to just above the predetermined pump setting position uses the guide rollers (not shown) installed on the internal pump handling device 26 and the rails 27 provided on the shroud 5, and It descends to the position of the internal pump 13 attached to the nozzle part 1a, grasps the parts of the internal pump 13, and pulls it up above the reactor pressure vessel 1. The internal pump 13 is handled from below the reactor pressure vessel 1 as well as from above as described above. However, at this time, the pump unit 1 is
3b is removed.

Hereinafter, a method of removing the internal pump 13 for each component 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 closing the flange portion 3 to prevent outflow of reactor water, the impeller 16 and the shaft 20 are integrally removed from above the reactor pressure vessel 1. Next, the wear ring 19 is removed alone, 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, after the flange portion of the pump casing 23 is closed to prevent the outflow of the reactor water, the diffuser 17 and the stretch tube 18 are integrally removed from above the reactor pressure vessel 1. In addition, the impeller 16 and the shaft 20, the diffuser 17 and the stretch tube 18 are integrally handled, and the wear ring 19 is independently handled using dedicated handling devices. The mounting work of the internal pump is performed in a procedure reverse to the above-described 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. FIG. 1 is a view for explaining the structure of an internal pump handling device according to the present embodiment (handles a diffuser and a stretch tube as one body). In FIG. 1, the handling device is indicated by a solid line, and the diffuser 17 and the stretch tube 18 are indicated by a two-dot chain line (imaginary line). In FIG. 1, the internal pump handling device 26
Has a protrusion 36a engageable with the concave portion 17a of the inner surface of the diffuser 17 and a support member 36A.
b, a grip block 30, a slide block 31 engaged with the grip section 30 by a key-shaped groove, an air cylinder 32 as a driving member connected to the slide block 31 via a rod 32a, and movement of the air cylinder 32. The grip detector 33 and the release detector 34, which are turned on and off in response to the above, respectively, and an insertion guide 35 that penetrates through the inside of the stretch tube 18 and protrudes from the distal end of the stretch tube so as to expand and contract in the radial direction of the stretch tube.

The insertion guide 35 is connected to the support member 30b of the gripping portion 30 via a sleeve 36, and has a tapered guide tip block 37 at the tip end thereof, and an insertion guide roller 38 elastically connected to the guide tip block 37. A guide shaft 39 is connected to the upper part of the insertion guide roller 38, and the guide shaft 39 is
The support member 30b of the grip portion 30 is connected to the lower end of the grip portion 30 via a. A guide shaft drive roller 40 is connected to the upper portion of the guide shaft 39 by a link mechanism 40b. The insertion guide roller 38 is moved by the action of the guide shaft drive roller 40, the link mechanism 40b, and the guide shaft 39. The stretch tube 18 can expand and contract in the radial direction in conjunction with the gripping operation (up and down movement).

As in the case of the conventional internal pump handling device, a limit switch 41a is attached to the plate 26a of the gripper body 26 as a seating detector, and the limit switch 41a is seated on the diffuser 17 so that the diffuser 17 and the stretch tube 18 are attached. Detects that it has reached the mounting position. 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 gripper main body 26A, and the limit switch 41 is seated on the pump deck portion 12, whereby the diffuser 1
7 and that the stretch tube 18 has reached the mounting position.

Since there is play between the projection 30a of the gripper 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 gripper body in the suspended state. There are gaps between them.

Next, the operation of the internal pump handling device 26 configured as described above will be described. When the present handling device is connected to the integrated diffuser 17 and the stretch tube 18, as shown in FIG. 2, the operation of the cylinder 32 causes the rod 32a to be in the upper position detected by the release detector 34. The slide block 31 connected to the gripper 30 is located at a position higher than the grip portion 30, and the grip portion 30 is in a contracted state in the diffuser 17.
Is located slightly above the concave portion 17a. At this time, the guide shaft driving roller 40 is in an open state at the upper end position of the stretch tube 18, and the guide shaft 39 is pulled up by the contraction force of the spring 40a, so that the guide shaft 3
The insertion guide roller 38 connected to the guide 9 is housed in the guide tip block 37 and is in a contracted state. Accordingly, 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 protruded from the tip of the stretch tube 18. Further, since the distal end portion of the guide distal end block is tapered, it can be easily inserted into the nozzle portion 1a at the lower part of the reactor pressure vessel 1 where the stretch tube 18 is attached.

Next, an operation of grasping the integrated diffuser 17 and stretch tube 18 is performed. That is,
By operating the cylinder 32, the rod 32a is lowered to a lower position detected by the grip detector 33, and the slide block 31 connected to the rod 32a is lowered to engage with the grip portion 30 by the key-shaped groove. Part 30
Goes down to the open state. Thereby, the projection 30a of the grip portion 30 and the concave portion 17a of the diffuser 17 are engaged, and the grip portion 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 in conjunction with the lowering operation of the grip portion 30, and is compressed and contracted inside the stretch tube 18, and the spring 40a extends 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 radially outward from the outer diameter of the stretch tube 18. Therefore, in the subsequent push-in operation of the integrated diffuser 17 and the stretch tube 18 into the inside of the nozzle portion 1a, the insertion guide roller 38 projecting outward from the outer diameter of the stretch tube 18 as described above is used. 1a
Since the insertion guide comes in contact with the inner wall, the insertion operation can be performed smoothly.

The detection of the mounting position of the diffuser 17 and the stretch tube 18 by the limit switch 41a is performed as follows in the same manner as in the prior art. That is, in the suspended state, since there is a gap between the upper surface of the diffuser 17 and the plate 26a of the gripper body, the limit switch 41a does not perform detection, but the diffuser 17 and the stretch tube 18 are mounted in the pump casing. When the position is reached, the protrusion 36a and the concave 1
This gap is eliminated by the action of the play of the engaging portion 7a, and the limit switch 41a detects the mounting position of the diffuser 17 and the stretch tube 18.

Further, the position at which the diffuser 17 and the stretch tube 18 are mounted is also detected by the limit switch 41. That is, when the diffuser 17 and the stretch tube 18 reach the mounting position, the limit switch 41 installed on the L-shaped plate 26b of the gripper main body 26A is seated on the upper surface of the pump deck portion 12, and
As a result, the limit switch 41 detects the mounting positions of the diffuser 17 and the stretch tube 18. Since the limit switch 41 is not affected by the elongation of the hanging tool, it is possible to reliably and easily proceed with the operation while confirming that the diffuser 17 and the stretch tube 18 have reliably reached the mounting position. Further, the position and the operability of the internal pump are improved without erroneously detecting the position of the stretch tube 18 before reaching the mounting position or causing an error in the mounting position.

According to the present embodiment, the insertion guide roller 38 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 downward movement of the grip portion 30, and the stretch tube 18 Since the protrusion extends radially outward, the insertion guide roller 38 is used when the stretch tube 18 is pushed into the nozzle portion inside 1a of the reactor containment vessel 1 while the diffuser 17 and the stretch tube 18 are grasped by the grasping portion 30. The insertion can be performed in a state of being in contact with the inner wall of the nozzle portion 1a as an insertion guide, and the push-in operation can be smoothly performed.

Further, since the distal end of the guide distal block 37 is tapered, the diffuser 1 can be used with the present handling apparatus.
The lower end of the stretch tube 18 can be easily inserted into the inlet of the inside 1a of the nozzle portion while holding the tube 7 and the stretch tube 18. In addition, a limit switch 41 for detecting the attachment position of the diffuser 17 and the stretch tube 18 by sitting on the pump deck portion 12.
Since the stretch tube 18 is provided, it is possible to confirm that the stretch tube 18 is securely seated without erroneously detecting the position before reaching the mounting position and without causing an error in the mounting position of the stretch tube 18.

Therefore, even in remote work several tens meters below the surface of the water, the internal pump can be easily mounted, and the workability is improved. Can also reduce the exposure dose.

Next, an internal pump handling apparatus according to another embodiment of the present invention will be described with reference to FIG. FIG.
The structure of the internal pump handling device shown in FIG. 1 is the same as that shown in FIG. 1 except that the structures of the insertion guide and its connection part are different. In FIG. 7, an insertion guide 35a is connected to a support member 30b of the grip portion 30 via a sleeve 36a, and has a tapered tip end block 37a, and an insertion guide finger elastically connected to the inside of the guide end block 37a. 38a, a finger slide block 38b engaged with the insertion guide finger 38a by a key-shaped groove, a guide shaft 39a is connected to the upper part of the finger slide block 38b, and the guide shaft 39a is attached to the lower end of the support member 30b of the grip portion 30. Are linked. The insertion guide finger 38a is in a contracted state when the finger slide block 38b is away from the upper position, and the finger slide block 38b descends to insert the insertion guide finger 38a.
When it is engaged by the key-shaped groove, it opens in the radial direction of the stretch tube. That is, similarly to the insertion guide roller 38 in the embodiment shown in FIG. 1, the insertion guide finger 38a can expand and contract in the radial direction of the stretch tube in conjunction with the vertical movement of the gripper 30. According to this embodiment, the same effects as those of the embodiment shown in FIG. 1 can be obtained.

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

According to this embodiment, the same effects as those 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 position of the diffuser 17 and the stretch tube 18 is confirmed from the lower part of the reactor pressure vessel 1. Further, the above-described configuration may be added to the internal pump handling device shown in FIG.

Next, an internal pump handling apparatus according to still another embodiment of the present invention will be described with reference to FIG. As shown in FIG. 9, in this embodiment, in addition to the internal pump handling device shown in FIG. 1, the following configuration is further added. That is, after removing the motor portion 13b,
A lower closing 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 in the lower closing plate 63, and a rod 65 integrated with a piston portion 65a is installed in the cylinder 64 at an upper position.
By supplying a fluid such as air from a hose 66 into the cylinder 64, the rod 65 can rise to the upper part of the pump casing. The raised position of the rod 65 is set to a predetermined height by the piston portion 65a and the collar 67. A channel 68 is provided in the upper portion of the cylinder 64, and serves as a drainage hole for the fluid when the fluid is inserted from the hose 66. When the insertion of the fluid from the hose 66 is stopped, water is supplied from the channel 68. It becomes a water injection hole for lowering the rod 65 by the water head pressure. Rod 65
A limit switch 60 is installed as a seat 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 seat indicator (not shown) at the lower part of the reactor pressure vessel 1 through a cable 69.

In this configuration, 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 on the lower end of the guide tip block 37, so that the diffuser 17 and the stretch tube 18 attachment position are detected. Confirmation of the detection of the mounting position is performed from the lower part of the reactor pressure vessel 1 through the cable 69.

According to this embodiment, the same effects as those 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 position of the diffuser 17 and the stretch tube 18 is confirmed from the upper part of the reactor pressure vessel 1. Further, the above-described configuration may be added to the internal pump handling device shown in FIG.

The table 65b at the upper end of the rod 65 is sized and shaped so as to be able to engage with the lower end of the diffuser 17 and the stretch tube 18 of the pump casing 23, and the table 65b is engaged with the lower end of the stretch tube 18 so that the diffuser 17 In addition, the mounting position of the stretch tube 18 can be directly detected. In such a case, the limit switch 60 can be omitted.

[0054]

According to the present invention, in the internal pump handling device, the guide means connected to the lower portion of the grip portion and penetrating through the inside of the stretch tube and projecting from the distal end is provided in conjunction with the vertical movement of the grip portion. Because the tube is expanded and contracted in the radial direction, when inserting the stretch tube into the nozzle of the containment vessel while holding the diffuser and the stretch tube at the grip, the guide means extends outside the outer diameter of the stretch tube and inserts. Insertion can be performed in a state of being in contact with the inner wall of the nozzle portion as a guide, and push-in insertion work can be performed smoothly.

Since the guide end block at the end of the guide means is tapered, the end of the stretch tube can be easily inserted into the nozzle inlet of the reactor pressure vessel. As described above, since the elastic member can be expanded and contracted in the radial direction of the stretch tube, the diffuser and the stretch tube can be smoothly inserted into the nozzle portion of the containment vessel by pushing the diffuser and the stretch tube in the same manner as described above.

Further, since the seating detector utilizing the pump deck portion of the internal pump is provided, it is ensured that the mounting positions of the diffuser and the stretch tube are not erroneously detected and the mounting positions are securely mounted without causing any error. It can be confirmed, and the reliability and workability of the handling work of the internal pump are improved.

Further, a lower closing plate and a support are installed at a lower part of the pump casing of the internal pump from a lower part of the reactor pressure vessel, and a seating detector installed at a lower end of the insertion guide is seated at an upper end of the support. Since the seating detector installed at the upper end of the supporting column is seated at the lower end of the insertion guide, the diffuser and the stretch tube mounting position are detected, so that, similarly to the above, the diffuser and the stretch tube mounting position are erroneously detected or the mounting position. Can be confirmed without any error, and the reliability and workability of the handling operation of the internal pump can be improved.

Further, a lower closing plate formed integrally with the cylinder is installed below the reactor pressure vessel below the pump casing of the internal pump, and a rod integral with the piston of the cylinder is mounted on the upper part of the pump casing by the cylinder. The diffuser and the stretch tube can be lifted by the seating detector installed at the lower end of the insertion guide seated at the upper end of the rod, or the seating detector installed at the upper end of the rod seated at the lower end of the insertion guide. Since the mounting position is detected, the mounting position of the diffuser and the stretch tube can be confirmed without mistakenly detecting the mounting position of the diffuser and the stretch tube, as described above. Reliability and workability are improved.

Therefore, even in remote work several tens meters below the surface of the water, the internal pump can be easily mounted, and the workability is improved. Can also reduce the exposure dose.

[Brief description of the drawings]

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

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

FIG. 3 is a view seen from above after removing a shroud head, a steam dryer, and an upper mirror of the reactor pressure vessel of the reactor pressure vessel shown in FIG. 2;

FIG. 4 is a sectional view showing a configuration of an internal pump.

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

FIG. 6 is a view showing a state when the internal pump handling device shown in FIG. 1 is connected to an integrated diffuser and a 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 an integrated diffuser and a stretch tube are inserted into a nozzle portion.

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

FIG. 9 is a view showing a 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 when an integrated diffuser and a stretch tube are inserted into a nozzle portion.

[Explanation of symbols]

 DESCRIPTION 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 Gripping body 30 Grab part 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 Support 54a Flange 64 Cylinder 65 Rod 65a Piston 65b Table

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-225693 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G21C 15/243 G21C 19/02

Claims (6)

(57) [Claims] 1. A crane suspended from above a reactor pressure vessel.
A gripper body and an internal member provided on the gripper body;
Connect the pump diffuser and stretch tube.
A gripping portion and a driving member for moving the gripping portion up and down
And the stretch tube connected to the lower portion of the grip portion.
Guide means that can penetrate the inside of the
The stretch zipper in conjunction with the vertical movement of the gripper.
Guide means which can extend and contract in the radial direction of the tube, the guide means having a tapered guide tip block, and an insert provided in the guide tip block and capable of extending and contracting in the radial direction of the stretch tube. guide rollers, features and be Louis centers null pump handling apparatus comprises a. 2. A device suspended from above a reactor pressure vessel.
A gripper body and an internal member provided on the gripper body;
Connect the pump diffuser and stretch tube.
A gripping portion and a driving member for moving the gripping portion up and down
And the stretch tube connected to the lower portion of the grip portion.
Guide means that can penetrate the inside of the
The stretch zipper in conjunction with the vertical movement of the gripper.
A guide means for expanding and contracting in the radial direction of the tube, and further provided on the gripper main body, for detecting a position where the diffuser and the stretch tube are attached by sitting on a pump deck of the internal pump. features and to Louis centers null pump handling device further comprising a detector. 3. A device suspended from above a reactor pressure vessel.
A gripper body and an internal member provided on the gripper body;
Connect the pump diffuser and stretch tube.
A gripping portion and a driving member for moving the gripping portion up and down
And the stretch tube connected to the lower portion of the grip portion.
Guide means that can penetrate the inside of the
The stretch zipper in conjunction with the vertical movement of the gripper.
A guide means which can be extended and contracted in the radial direction of the tube, and further, a lower closing plate installed at a lower part of a pump casing of the internal pump from a lower part of the reactor pressure vessel,
A post installed on the lower closing plate and engaged with the upper part of the pump casing, and a seating detector installed at the lower end of the insertion guide and detecting the mounting position of the diffuser and the stretch tube by sitting on the upper end of the post are provided. features and to Louis centers null pump handling device that. 4. A device suspended from above a reactor pressure vessel.
A gripper body and an internal member provided on the gripper body;
Connect the pump diffuser and stretch tube.
A gripping portion and a driving member for moving the gripping portion up and down
And the stretch tube connected to the lower portion of the grip portion.
Guide means that can penetrate the inside of the
The stretch zipper in conjunction with the vertical movement of the gripper.
A guide means which can be extended and contracted in the radial direction of the tube, and further, a lower closing plate installed at a lower part of a pump casing of the internal pump from a lower part of the reactor pressure vessel,
A support installed on the lower closing plate and engaged with the upper part of the pump casing, and a seating detector installed on the upper end of the support and detecting a diffuser and a stretch tube mounting position of the diffuser and the stretch tube of the gripper body by sitting on the lower end of the insertion guide. features and to Louis centers null pump handling device to have and. 5. A reactor suspended from above a reactor pressure vessel.
A gripper body and an internal member provided on the gripper body;
Connect the pump diffuser and stretch tube.
A gripping portion and a driving member for moving the gripping portion up and down
And the stretch tube connected to the lower portion of the grip portion.
Guide means that can penetrate the inside of the
The stretch zipper in conjunction with the vertical movement of the gripper.
A guide means which can be extended and contracted in the radial direction of the tube, and further, a lower closing plate installed at a lower part of a pump casing of the internal pump from a lower part of the reactor pressure vessel,
A cylinder formed integrally with the lower closing plate and capable of sucking a fluid therein, a rod formed integrally with a piston portion in the cylinder and capable of ascending to the upper part of the pump casing by the fluid in the cylinder; features and to Louis <br/> centers null pump handling device that has a seating detector that detects the diffuser and stretch tube mounting position of the gripper body by being installed to a lower end seated on said rod upper end. 6. A unit suspended from above a reactor pressure vessel.
A gripper body and an internal member provided on the gripper body;
Connect the pump diffuser and stretch tube.
A gripping portion and a driving member for moving the gripping portion up and down
And the stretch tube connected to the lower portion of the grip portion.
Guide means that can penetrate the inside of the
The stretch zipper in conjunction with the vertical movement of the gripper.
A guide means which can be extended and contracted in the radial direction of the tube, and further, a lower closing plate installed at a lower part of a pump casing of the internal pump from a lower part of the reactor pressure vessel,
A cylinder formed integrally with the lower closing plate and capable of sucking fluid therein; a rod formed integrally with a piston portion in the cylinder and capable of ascending to the upper part of the pump casing by the fluid in the cylinder; features and to Louis <br/> centers null pump handling device that has a seating detector that detects the diffuser and stretch tube mounting position of the gripper body by being placed seated on the insertion guide lower end.