JP2000035495A - Intra-pipe apparatus setter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intra-pipe apparatus setter, capable of setting a working apparatus, rapidly and accurately, at a desired position in a pipe, when work is executed in the pipe. SOLUTION: This setter is equipped with a setter body 52 made up of a long flexible member and energizing a working apparatus 100 to be set in a pipe in order to move it to a desired position, and wall-surface guide members 54 provided so as to project from the setter body 52 for preventing the setter body 52 inserted in the pipe from contacting with an inner wall surface of the pipe. The wall-surface guide members 54 each have guide rollers 53 that roll on the inner surface of the pipe when the setter body 52 is inserted into the pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-pipe equipment installation tool for installing work equipment at a desired position in a pipe, and more particularly to a boiling water reactor (hereinafter referred to as "BWR"). The present invention relates to an in-pipe equipment installation tool suitable for installing work equipment at a desired position in a BWR pipe when performing preventive maintenance or inspection.

[0002]

2. Description of the Related Art FIG. 9 is a longitudinal sectional view showing a schematic configuration of a reactor pressure vessel of a BWR and its internal structure. A coolant 2 exists inside the reactor pressure vessel 1, and a core 3 is submerged in the coolant 2. The core 3 is composed of a plurality of fuel assemblies (not shown) and is housed in a core shroud 10.

[0003] The coolant 2 flows upward through the core 3, and at this time, the temperature is increased by the nuclear reaction heat of the core 3, and a two-phase flow of water and steam is formed. The two-phase coolant 2 flows into the steam separator 4 installed above the reactor core 3, where it is separated into water and steam. Among them, the steam is introduced into a steam dryer 5 installed above the steam separator 4, and is dried to become dry steam. The dried steam is transferred to a steam turbine (not shown) via a main steam pipe 6 connected to the reactor pressure vessel 1 and is used for power generation.

On the other hand, the separated water flows down the core 3 through the downcomer 7 between the core 3 and the reactor pressure vessel 1. A plurality of control rod guide tubes 8 are provided below the core 3, and control rods (not shown) are inserted into or pulled out of the core 3 via the control rod guide tubes 8.

A control rod drive mechanism 9 is provided below the control rod guide tube 8, and controls the insertion and withdrawal of the control rod into and from the reactor core 3 by the control rod drive mechanism 9. In the downcomer section 7, a plurality of jet pumps 11 are installed at equal intervals along the circumferential direction of the reactor.

[0006] A reactor recirculation pump (not shown) is provided outside the reactor pressure vessel 1, and includes a reactor recirculation pump, a jet pump 11, and a reactor recirculation piping ( (Not shown)) constitutes a reactor recirculation system. That is, the driving water of the jet pump 11 is supplied by the reactor recirculation pump, and the coolant 2 is forcibly circulated into the core 3 by the action of the jet pump 1.

FIG. 10 is a perspective view showing a portion of a jet pump 11 in the reactor pressure vessel 1, and FIG. 11 is a diagram showing a transition piece and an elbow. As shown in FIGS. 10 and 11, the jet pump 11 has a riser pipe 12 in the center, and the riser pipe 12 supplies the coolant supplied from the reactor recirculation pump to the reactor pressure via the recirculation inlet nozzle 13. It is designed to be introduced into the container 1.

A pair of elbows 15A and 15B are connected to the upper part of the riser tube 12 via a transition piece 14. A pair of inlet throats 17A, 17B are connected to the pair of elbows 15A, 15B via a pair of mixing nozzles 16A, 16B.

These inlet throats 17A, 17
Diffusers 18A and 18B are connected to the lower part of B, respectively, and when the coolant 2 is jetted from the upper mixing nozzles 16A and 16B, the reactor water is drawn in from the surroundings.

The injected coolant 2 and the entrapped reactor water are mixed in the inlet throats 17A and 17B, and thereafter, the hydrostatic head is recovered by the diffusers 18A and 18B.

In the above configuration, the flow of the coolant sent from the reactor recirculation pump causes fluid vibration. To cope with this, the riser pipe 12 has its lower end welded to the recirculation inlet nozzle 13. The upper end is fixed to the reactor pressure vessel 1 via a riser brace 20. In FIG. 10, reference numeral 36 denotes a riser bracket.

The inlet throats 17A and 17B have mixing nozzles 16A and 16B and vents 15A and 15B at their upper ends.
And is mechanically connected to the transition piece 14 via the lower end, and the lower end is inserted into the upper end of the diffusers 18A and 18B. As described above, both the riser pipe 12 and the inlet throats 17A and 17B are configured in consideration of the occurrence of the fluid vibration, and have a configuration capable of sufficiently coping with the fluid vibration.

FIG. 12 is a perspective view showing the structure near the riser pipe 12. As shown in FIG. 12, a pad 39 is formed on the inner wall of the reactor pressure vessel 1. Pad 39
, Four thin plates 40 are welded, and the thickness of the thin plates 40 is about 10 mm. The tip of the four thin plates is block 4
1 and are integrally formed with each other through the riser pipe 12.
Is inside the block 41 (on the inner wall surface of the reactor pressure vessel 1)
Welded to.

The riser brace 20 is connected to the riser tube 1.
2 suppresses fluid vibration during the operation of the reactor and absorbs a difference in thermal expansion between the reactor pressure vessel 1 made of carbon steel and the riser pipe 12 made of austenitic stainless steel. Therefore, during the operation of the reactor, the reactor is in a deformed state absorbing the difference in thermal expansion.

[0015]

In the above configuration,
For example, rust, cracks, or the like may occur on the inner surface of the riser tube 12 for some reason. The riser tube 12
Austenitic stainless steel pipes are mainly used as the material for the steel, so stress corrosion cracking (SCC) occurs when the three conditions of stress, corrosion environment, and material (chromium-depleted layer) are satisfied.
And the riser pipe 12 may be damaged.

Since stress corrosion cracking does not occur if any one of the above three conditions is missing, various measures must be taken in consideration of the above three conditions in order to prevent stress corrosion cracking. is there.

When rust or cracks are generated on the surface of the jet pump 11 for some reason, if the rust or cracks are left undisturbed, the cracks may progress and the jet pump 11 may crack. The fact that the jet pump 11 that controls the power of the nuclear reactor becomes such a state is as follows.
It can also have a negative effect on other structures,
Such damage to the jet pump 11 must be avoided.

The present invention has been made in consideration of the above-described circumstances, and when performing work in a pipe, a pipe capable of quickly and accurately installing work equipment at a desired position in the pipe. It is intended to provide an internal equipment fixture.

[0019]

SUMMARY OF THE INVENTION An apparatus for installing equipment in a pipe according to the present invention comprises a flexible elongate member for urging work equipment to be installed in the pipe to move it to a desired position in the pipe. And a wall guide member protruding from the fixture body so that the fixture body inserted into the pipe does not contact the inner wall surface of the pipe. The guide member has a guide roller that rolls on the inner wall surface of the pipe when the fixture body is inserted into the pipe.

Further, it is preferable that the fixture main body is constituted by a bellows tube.

Further, it is preferable that the fixture main body is configured by pivotally connecting a plurality of short members in a line.

Further, it is preferable that the fixture main body is formed by connecting a plurality of short members with a spring member.

Further, it is preferable that the wall guide member is formed of an elastic member, and the guide roller is provided at a tip end of the elastic member.

In addition, a wall guide member constituted by a brush member is provided in place of the wall guide member having the guide roller, and when the fixture body is inserted into the pipe, the tip of the brush member is connected to the pipe. It is preferable to slide on the inner wall surface of the base.

[0025]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a pipe fitting according to an embodiment of the present invention.

FIG. 1 shows a jet pump laser device 100, which is a device for inspection and repair work, using a jet pump elbow 42, which is a device for inspection and repair work, by using a pipe fitting device 50 according to this embodiment.
It is a figure showing the state inserted in the inside and installed in the riser pipe 12 part. FIG. 2 is a sectional view taken along line AA of FIG.

[0027] As shown in FIG.
Is provided with a fixture main body 52 formed of a flexible long member, and the fixture main body 52 is provided inside the piping with a working device, for example, a laser device 100 for a jet pump.
In order to move the laser device 100, the laser device 100 is inserted into the pipe and urges the laser device 100 at its tip.

The fixture main body 52 is formed by a telescopic bellows tube. The laser device 100 is rotatably connected to a distal end portion of the fixture main body 52 by a connecting member 51.

The wiring, piping, etc. of the laser device 100 can be housed inside the fixture body 52 made of a bellows tube.

In order to prevent the fixture body 52 inserted into the pipe from coming into contact with the inner wall surface of the pipe, a plurality of wall guide members 54 made of an elastic member, preferably a spring member, protrude from the fixture body 52. Have been. A guide roller 53 that rolls on the inner wall surface of the pipe when the fixture main body 52 is inserted into the pipe is provided at the distal end of the wall guide member 54.

As can be seen from FIG. 1, the wall guide member 54
Are provided at different positions in the longitudinal direction of the fixture main body 52. As can be seen from FIG. 2, the number of wall guide members 54 is four (four in this embodiment) per one place.
Are arranged at equal angular intervals.

A wall guide member 5 having a guide roller 53
4, the fixture body 52 made of a bellows tube
Buckling due to excessive bending can be prevented, and the operation of moving the fixture main body 52 in the pipe can be performed smoothly.

Further, since the wall guide member 54 is formed of an elastic member, the wall guide member 54 is flexibly bent in accordance with the inner diameter of the pipe, and the mounting body 52 is connected to the wall guide member 54 regardless of the inner diameter of the pipe. Can be guided and supported.

Further, since the guide roller 53 is provided at the tip of the wall surface guide member 54, the guide roller 53 rolls on the inner wall surface of the pipe when the apparatus 50 is moved in the pipe. A smooth moving operation can be achieved.

A guide roller 55 for movement is attached to the lower side of the laser device 100.
The structure is easy to move when pushing up. Further, by providing the guide roller 55 at the cable joint portion of the laser device 100, it is possible to prevent the cable from being excessively bent.

At the front side of the laser device 100, an in-pipe fixing device 57 is attached.
7 has a plurality of fixing arms 56 that can be pressed against the inner wall surface of the pipe.

As a first modified example of the present embodiment, the fixture main body can be constructed by pivotally connecting a plurality of short members in a row in place of the bellows tube. FIG. 3 shows this first modification, in which the fixture body is constituted by a track 60.

Further, in the first modification shown in FIG. 3, the wall guide member is constituted by a brush guide 61, and when the fixture body composed of the caterpillar 60 is inserted into the pipe, the brush guide 61 is moved. The distal end is configured to slide on the inner wall surface of the pipe.

FIGS. 4 and 5 show a second modified example. In this second modified example, a plurality of short members 70 having a T-shaped cross section are pivotally connected in a line by connecting pins 71. Thus, the fixture main body is configured. Four projecting portions 73 project from the short member 70 at intervals of 90 degrees, and these projecting portions 73 constitute a wall guide member. A guide roller 72 is provided at the tip of each projecting portion 73. I have.

FIG. 6 shows a third modification.
In the third modification, a plurality of short members 80 having a cross-shaped cross section are connected to each other by a spring member 81 to form an installation body. Four overhanging portions 83 project from the short member 80 at intervals of 90 degrees, and these overhanging portions 83 constitute a wall guide member. A guide roller 82 is provided at the tip of each overhanging portion 83.

Next, a description will be given of a case where a BWR periodic inspection is performed using the in-pipe equipment fixture 50 according to the present embodiment.

FIG. 7 is a longitudinal sectional view showing a state in which preventive maintenance of the structure and the jet pump is being performed during the periodic inspection of the BWR, and FIG. 8 is an enlarged view of a portion A in FIG. is there. When performing maintenance work on the jet pump,
First, a seal is attached to the opening above the riser pipe 12 using the wire rope 90 of the auxiliary hoist 92 of the fuel exchanger 91 above.

Thereafter, from the outside of the reactor pressure vessel 1,
The laser device 100 is inserted into the reactor pressure vessel 1 through the recirculation inlet nozzle 13 (see FIG. 10) opened by cutting the external pipe of the reactor pressure vessel 1 together with the in-pipe fixing device 57 shown in FIG. Insert

When the laser device 100 is pushed up to a desired position in the riser pipe 12 by the in-pipe equipment fixture 50 according to the present embodiment, the fixing arm 56 of the in-pipe fixing device 57 is pushed out, and the inside of the riser pipe 12 is pushed out. The in-pipe fixing device 57 is fixed to the wall surface, thereby fixing the laser device 100 at a desired position.

The maintenance work of the jet pump 11 is performed using the laser device 100 installed at a desired position in the riser pipe 12 by the above operation.

As described above, in the periodic inspection of the BWR, by using the in-pipe equipment fixture 50, the reactor water inside the reactor pressure vessel 1 is not drained under a full condition without draining water.
It is possible to carry out maintenance and inspection work of the piping inside the reactor pressure vessel 1 such as the riser pipe 12.

Therefore, the soundness and reliability of the reactor can be improved, and the radiation exposure dose of the workers can be greatly reduced. As a result, safe operation of the nuclear reactor can be maintained, and the operation rate of nuclear power can be improved.

As described above, according to the in-pipe equipment fixture 50 according to the present embodiment, the fixture main body 52 can be kept in the pipe by the wall surface guide member 54 having the guide roller 53 even when there is a curved surface or a hooked portion. It is possible to move smoothly, and thereby, work equipment such as the laser device 100 can be quickly and accurately installed at a desired position in the piping, thereby shortening the work time of the preventive maintenance work. Can be.

[0049]

As described above, according to the apparatus for installing equipment in a pipe according to the present invention, a wall guide member having a guide roller is protruded from a fixture body composed of a flexible elongate member.
Since the guide roller rolls on the inner wall of the pipe when the fixture body is inserted into the pipe, the equipment for fitting in the pipe allows the working equipment to be moved quickly and accurately to a desired position in the pipe. Can be transported.

[Brief description of the drawings]

FIG. 1 is a view showing a state in which a laser device for a jet pump is inserted into a jet pump elbow section and installed in a riser pipe by using an in-pipe equipment installation tool according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a diagram showing a first modification of the embodiment of the present invention shown in FIG. 1;

FIG. 4 is a view showing a second modification of the embodiment of the present invention shown in FIG. 1, showing a state after passing through an elbow section.

FIG. 5 is a view showing a second modification of the embodiment of the present invention shown in FIG. 1, showing a state in which it passes through an elbow section.

FIG. 6 is a view showing a third modification of the embodiment of the present invention shown in FIG. 1;

FIG. 7 is a longitudinal sectional view showing a state where preventive maintenance of a structure and a jet pump is being performed during a periodic inspection of the BWR.

FIG. 8 is an enlarged view of a portion A in FIG. 7;

FIG. 9 is a longitudinal sectional view showing a schematic configuration of a reactor pressure vessel of a BWR and an internal structure thereof.

FIG. 10 is a perspective view showing a part of a jet pump in a reactor pressure vessel of a BWR.

FIG. 11 is a diagram showing a transition piece and an elbow portion of the BWR.

FIG. 12 is a perspective view showing a configuration of a riser tube portion of the BWR.

[Explanation of symbols]

 REFERENCE SIGNS LIST 50 Pipe installation equipment 51 Connecting member 52 Installation body 53, 55, 72, 82 Guide roller 54 Wall guide member 56 Fixing arm 57 Pipe fixing device 60 Caterpillar 61 Brush guide 70, 80 Short member 71 Connection pin 73, 83 Projection part (wall guide member) 81 Spring member 100 Laser device for jet pump (work equipment)

Continued on the front page (72) Inventor Shunichi Hatano 8th Shinsugitacho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Inside the Toshiba Yokohama Office (72) Inventor Ken Ken Okuda 8th Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Inside Toshiba Yokohama Office (72) Inventor Koichi Aima 2-4-4 Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Inside Toshiba Keihin Office Co., Ltd. (72) Takeshi Maehara 2--4, Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Address F-term in Toshiba Keihin Works (reference) 2G075 AA03 BA16 CA13 DA14 DA16

Claims (6)

[Claims] 1. A fixture main body composed of a flexible elongate member for urging a working device to be installed in a pipe to move it to a desired position in the pipe, and said tool inserted into the pipe. In order to prevent the fixture main body from contacting the inner wall surface of the pipe, a wall guide member protruding from the fixture main body is provided, and the wall guide member has the fixture main body inserted into the pipe. A device for installing equipment in a pipe, comprising: a guide roller that rolls on an inner wall surface of the pipe at the time. 2. The apparatus according to claim 1, wherein said fixture body is constituted by a bellows tube. 3. The in-pipe equipment installation according to claim 1, wherein the installation main body is configured by pivotally connecting a plurality of short members in a line. 4. The in-pipe equipment installation according to claim 1, wherein the installation main body is formed by connecting a plurality of short members with a spring member. 5. The device according to claim 1, wherein the wall guide member is formed of an elastic member, and the guide roller is provided at a tip end of the elastic member. Equipment for installation in piping as described in. 6. A wall guide member constituted by a brush member is provided in place of said wall guide member having said guide roller, and when said fixture body is inserted into a pipe, a tip end of said brush member is connected to a pipe. The apparatus for installing equipment in a pipe according to any one of claims 1 to 4, wherein the apparatus slides on an inner wall surface of the pipe.