JPH06300885A - Inspection tool for internal pump - Google Patents

Abstract

PURPOSE:To enable conducting liquid permiation inspection of a stretch tube simply and surely without taking out the stretch tube during disassembling an internal pump with an easily detachable small-size device. CONSTITUTION:In a casing of an internal pump, a hollow shaft 44 is provided, and in this hollow shaft 44, a holder 33 containing a black light 34 and a lens tube 35 is inserted. To this holder 33, fiber cables 42, 43 are connected. To the upper end of the hollow shaft 44, a distribution box 32 having a discharge hole 37 for discharging various inspection liquid is connected by way of a bush with key. To this distribution box 32, hoses 38 to 41 supplied by various inspection liquid is connected. A piston 48 and a cylinder 49 are provided to the outer surface of the hollow shaft 44 and the piston 48 is moved up and down by the upper and the lower hydropressure tubes 61 and 62 accompanied by the hollow shaft 44 moved up and down. The hollow shaft 44 is connected with a gear 55 to a motor 59 and rotated by the motor 59.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal pump inspection tool constructed so that the surface condition of a stretch tube in an internal pump used in an improved boiling water reactor can be directly inspected by a penetrant flaw detection test. Regarding

[0002]

2. Description of the Related Art An outline of an internal pump used in a conventional improved boiling water reactor will be described with reference to FIG. Reference numeral 1 partially shows the bottom of the reactor pressure vessel, and a stub tube 2 is erected on the inner surface of the reactor pressure vessel 1. A shroud 3 is provided near the upper part of the stub tube 2, and a diffuser 4 is provided between the shroud 3 and the reactor pressure vessel 1.

The internal pump 5 is composed of a pump section 6 and a motor section 7. The pump section 6 is composed of an impeller 8 and a diffuser 4, and a shaft 9 is attached to the impeller 8. Motor part 7 is a casing
It is composed of a water immersion type motor 13 consisting of a rotor 11 and a stator 12 inside a bearing 10, a bearing 14 and the like.

The rotor 11 and the stator 12 are covered with an inner can 21 and an outer can 22 in order to burn the coil of the water-immersion type motor 13 by cooling water. The casing 10 is composed of a large diameter pipe portion 10a for accommodating the motor portion 7 and a small diameter pipe portion 10b.

The small-diameter tube portion 10b is inserted into the stub tube 2 and its tip is welded to the inner surface of the stub tube 2. A diffuser boss 15 protruding from the diffuser 4 is placed on the upper end surface of the stub tube 2, and a sticker packing (not shown) is mounted on the seat surface, and the diffuser boss 15 is fixed by the upper end of the stretch tube 16. To be done.

A female screw is attached to the lower end of the stretch tube 16.
17 is formed, and a tightening nut 18 is screwed into the female screw 17, and the tightening nut 18 tightens the casing 10. The tightening nut 18 is prevented from rotating by a lock sleeve 19, and the lock sleeve 19 is always used integrally with the tightening nut 18, and is itself screwed to the casing 10. A secondary seal 20 is provided below the tightening nut 18.

The lower open end of the casing 10 is closed by a motor flange 24 and a small flange 25, a cooling water inlet pipe 26 is connected to the lower end of the casing 10, and a leak water pipe 27 and a high pressure water pipe are provided at the shoulder of the casing 10. 28 and the cooling water outlet pipe 29 are sequentially connected in the downward direction. Forced water flow is performed from the cooling water inlet pipe 26 to the cooling water outlet pipe 29.

The motor flange 24 is fastened by a stud 30 to a flange formed at the lower end of the casing 10.
The small flange 25 is connected to the motor flange 24 by a bolt 23 and is for opening and closing when the shaft 9 and the inner can 21 are integrated.

In the internal pump 5 having the above structure, however, when tightening the stretch tube 16 which is generally integrated with the diffuser 4 installed in the reactor water, a handling tool for the tightening nut 18 is placed in the casing 10. The tightening nut 18 is inserted from the open end and screwed into the female screw 17 of the stretch tube 16 to be mounted.

By the way, tensile stress at the time of tightening, high temperature reactor water, and thermal stress at a portion where leak water flowing between the stretch tube and the shaft is in contact with the stretch tube.

Since this stress needs to be inspected by a penetrant flaw detection test when the internal pump is stopped, a new inspection tool has been proposed. It can be said that this inspection tool is extremely important because the breakage of the stretch tube immediately leads to the reactor water seal.

In order to prevent the reactor water from entering the casing 10, it is said that all three elements described below should be fulfilled. That is, the first is that the stretch tube 16 is sufficiently and tightly tightened by the tightening nut 18, and the surfaces of the stub tube 2 and the diffuser boss 15 are brought into close contact with each other via the packing to seal the reactor water from the outer periphery of the diffuser boss 15. To do.

Secondly, the outer circumferences of the stretch tube 16, the impeller 8 and the shaft 9 are sealed by applying pressure water to the secondary seal 20 to prevent gap flow between the inside of the stretch tube 16 and the outside of the shaft 9.

Thirdly, the sealing water from the leak water pipe 27 overflows into the gap between the outer circumference of the stretch tube 16 and the inner circumference of the small diameter tube portion 10b of the casing 10 and the gap between the inner circumference of the stretch tube 16 and the outer circumference of the shaft 9. To prevent gap flow.

[0015]

However, the stretch tube 16 cannot be inspected at all while the internal pump is in operation, and if the stretch tube 16 is inconvenient, the reactor water flows into the casing 10.

The behavior of this reactor water flows from the outside of the diffuser boss 15, the inside of the diffuser boss 15, and the back and back of the stretch tube 16 into the small-diameter pipe portion 10b, and eventually within the casing of the large-diameter pipe portion 10a. Infiltrate into.

In this case, since the cooling water is circulated in the casing 10 for cooling the water immersion motor 13, the cooling water is slightly contaminated temporarily. However, in the long term, the reactor water is the small-diameter pipe portion 10b of the casing 10.
And flows into the large-diameter tube portion 10a.

In the improved boiling water reactor, the internal pump 5 is directly fixed to the reactor pressure vessel 1. Further, since the impeller 8 and the shaft 9 are inserted and attached from the upper side of the furnace, the tip of the small diameter tube portion 10b of the casing 10 is naturally opened.

Therefore, the high temperature reactor water comes into contact with the cooling water of the immersion motor and the sealing water of the casing 10 such as leak water near the upper surface of the stretch tube 16. Around this contact portion is a factor that causes thermal stress in the stretch tube 16.

The shaft 9 rotates at a high speed, and
Since there is a gap flow between the inside of the stretch tube 16 and tensile stress at the time of tightening is generated in that state,
It is necessary to fully consider measures against stress damage.

Therefore, a reliable inspection is required before and after the operation of the internal pump. However, before operation, it can be sufficiently confirmed by model tests, non-destructive inspection, etc., but after operation, when inspecting with the stretch tube attached, there is a problem that it cannot be used because of the shape and internal structure of the casing.

The present invention has been made to solve the above-mentioned problems, and is simple and reliable when performing an inspection after the operation of the internal pump, and it is simple and easy to perform with the stretch tube attached while the internal pump is disassembled. An object of the present invention is to provide an inspection tool for an internal pump capable of reliably performing a liquid penetration inspection of a stretch tube.

[0023]

SUMMARY OF THE INVENTION The present invention is directed to a stretch tube inserted into a small-diameter tube portion of an internal pump casing, a plug for closing the upper end of the stretch tube, and an inside surface of the plug from the inside of the stretch tube. A hollow shaft extending through to the vicinity of the lower end of the casing, a distribution box having discharge holes for various test liquids provided on the upper end surface of the hollow shaft, and a black light passing through the distribution box and A holder holding the lens barrel, a black light in the holder, a fiber cable connected to the lens barrel, various test liquid supply hoses for supplying various test liquids to the discharge holes for the various test liquids, and the hollow shaft The keyed bush provided on the outer surface, and the end plugs provided on the lower surface of the keyed bush and the upper outer surface of the hollow shaft. A piston, a cylinder provided on the end plug and the outer surface of the piston, a cylindrical frame provided on the outer surface of the cylinder through a pair of upper and lower metals, and a motor provided on the frame via a gear. , An upper hydraulic pipe provided between the casing and the frame for supplying pressurized water to the upper surface of the piston, and a pressurized water provided between the frame and the lower portion of the cylinder between the hollow shaft and the cylinder. At the lower end of the hollow shaft that binds the outer surface of the fiber cable and the various test liquid supply pipes drawn out from the lower end of the hollow shaft. And an end collar provided.

[0024]

[Operation] When disassembling, inspecting, or repairing the internal pump, which is stopped after operation during regular inspection, etc., the impeller, shaft, and water immersion motor are taken out from the casing in advance, and then the opening of the diffuser boss is blindly plugged with a plug. Then, intrusion of reactor water from the reactor pressure vessel is prevented.

After that, after a series of work steps for taking out the secondary seal, the tightening nut, the lock sleeve, etc., without stretching the stretch tube, that is, in the same mounting state as during operation, the inside of the diffuser boss is engaged. The liquid permeation test is performed by contacting the inside of the small-diameter tube portion of the casing and inserting the inspection tool in an upright state.

The inspection tool is inserted into the casing by a screw rod, and the fiber scope and the gas-liquid distribution box for permeation provided at the top of the inspection tool are freely rotated or vertically moved to inspect the inner surface of the stretch tube and the like.

A cable in the space inside the hollow shaft that serves as a column for movement and a hose for gas-liquid pressure feeding are connected to a separate light source device and monitor device, and one of them is an acetone tank for cleaning and a water tank for cleaning. Connect a hose to a liquid tank for fluorescent penetrant, a heater for dry air, etc., and control from a distance. As a result, the liquid permeation inspection for detecting the breakage of the stretch tube after the operation can be easily and reliably performed.

That is, the fiberscope and the distribution box are fixed on the hollow shaft, the coaxial is passed through the cylinder, and pressure water is charged to the coaxial piston portion by the upper and lower water pipes connected to the cylinder, and the hollow shaft, and by extension, the Move the fiberscope and distribution box up and down.

Next, bosses that are raised in the cylinder are provided at two positions, upper and lower, and are directly engaged with the corresponding upper and lower metal of the cylindrical frame to hold the freedom of rotation, thrust, and own weight. Further, the pinion at the motor output shaft end is engaged with the gear created from the outside of the cylinder. The motor is fixed by cutting out a part of the cylindrical frame.

The cylindrical frame extends and has a flange portion at the lower end corresponding to the flange of the casing. The flange is provided with a flange of the casing and a pair of screw rod rod locking portions, and when the screw rod is rotated by the driving device, two pairs form a pair, and the flange of the cylindrical frame integrated with the nut portion moves up and down. Along with this, the compactly constructed inspection tool on the cylindrical frame moves up and down. In addition, for the transfer of the repair tool by the screw rod method, a permanent one for the casing of the internal pump is used. Drive the screw rod, insert the tool into the casing flange, fix the tool after fitting the flange to the casing flange, and fix the cables and hoses inside the hollow shaft and water pipes that have passed through the inside of the cylindrical frame to the outside of the casing. Get out.

A light source device and a monitor device are connected to the cable, acetone, air, water, and a penetrant liquid supply device are connected to the distribution box, and a pump device is connected to the cylinder. All of these can be performed by remote control, and because they are compact and easy to move, the liquid permeation inspection of the stretch tube of the internal pump can be performed during the periodic inspection.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the inspection tool for an internal pump according to the present invention will be described with reference to FIGS. Figure 1
Is a state in which the impeller 8, the motor portion 7, the tightening nut 18, the lock sleeve 19 and the motor flange 24 of the internal pump 5 in FIG. 5 are removed, and the inspection tool according to the present embodiment is inserted from the diffuser 4 into the casing 10. Is shown.

FIG. 2 shows a state in which the internal pump casing 10 is taken out and stored. FIG. 3 shows an example of an inspection method, and FIG. 4 shows an inspection device connected to a fiber cable.

In FIG. 1, reference numeral 31 is a diffuser boss.
The plug inserted in 15 and mounted on the upper end surface of the stretch tube 16 is shown. The plug 31 is hollowed out to form a hollow portion 31a having an open lower end, and a suspension rod 31b is attached to the upper portion.

A distribution box 32 is provided in the hollow portion 31a of the plug 31.
A black light 34 and a lens barrel 35 are supported by a holder 33 on the upper part of the distribution box 32 as shown in FIG.

The distribution box 32 has four chambers a, b, c and d divided by a partition 36, and discharge holes 37 are formed in each of the chambers a, b, c and d. Each chamber a of the distribution box 32,
Permeate hose 38, acetone hose 39, air hose 40, and water hose 41 are connected to b, c, and d as various test liquid supply hoses for supplying test liquids.

Further, a fiber cable 42 connected to the black light 34 and a fiber cable 43 connected to the lens barrel 35 are led out from the holder 33. These fiber cables 42 and 43 and the hoses 38 to 41 are inserted into the hollow shaft 44 and bound to the end collar 52 at the end thereof.

The hollow shaft 44 is provided so as to penetrate the inside of the stretch tube 16 from the inner surface of the plug 31 and extend to the vicinity of the lower end of the large diameter pipe portion 10a of the casing 10. A bush 45 with a key is provided on the outer surface of the hollow shaft 44 in the vicinity where the cooling water outlet pipe 29 connected to the casing 10 is located, and an upper end plug 46 is provided on the lower surface of the bush 45 with a key, and a pressurized water Channel 47
A piston 48 is provided via the. The upper end plug 46 allows the hollow shaft 44 to slide and closes the end of the cylinder 49.

A cylinder 49 is provided on the outer surfaces of the upper end plug 46 and the piston 48. Lower end plugs 50 are provided on the lower inner surface of the cylinder 49 and the lower outer surface of the hollow shaft 44,
An end cover 51 is provided on the lower surface of the lower end plug 50. The piston 48 is fixed to the hollow shaft 44 by welding or the like.

A collar 5 is provided on the outer surface of the upper and lower end portions of the cylinder 49.
3, 54 are formed, and a gear 55 is attached to the side surface. A cylindrical frame 58 is provided on the outer surfaces of the collars 53 and 54 with metals 56 and 57 interposed therebetween. The metals 56 and 57 are fixed to the cylindrical frame 58 with bolts or the like.

A motor 59 is fastened to a part of the cylindrical frame 58 with a bolt or the like. The motor 59 meshes with the gear 55 through a pinion 60, and the motor 59 is driven to rotate the cylinder 49.

An upper hydraulic pipe 61 for supplying pressurized water to the pressurized water flow path 47 between the upper end plug 46 and the piston 48 is provided between the cylindrical frame 58 and the casing 10, and the lower end plug 50 is provided. To supply the pressurized water between the hollow shaft 44 and the cylinder 49 from the lower hydraulic pipe 62 to the cylindrical frame 58 and the cylinder 49.
It is provided between the lower outer surface of the.

A conical trough-shaped drain pan 63 is fixed to the upper end surface of the upper metal 56 by a stud or the like, which surrounds the outside of the keyed bush 45. The drain pan 63 extends from the bottom inclined surface of the drain pan 63 to the lower end of the casing 10. A drain pipe 64 is provided there.

1 and 2, reference numeral 65 is a large flange connected to the lower end surface of the casing 10, and a pair of screw rods 66 and 67 are attached to the large flange 65 by screwing.

Next, the operation of the above embodiment will be described. The keyed bush 45 is attached to the head of the cylinder 49 in a capped state, has a key (not shown) on the inner surface, and has a hollow shaft
When rotating by engaging with the keyway of the cylinder 49
Tell the rotation of. The drain pan 63 is a pan that receives acetone, permeate, etc. contained in the washing water, and is drained by the drain pipe 64.

A pair of upper and lower metals 56, 57 are fixed to a cylindrical frame 58, and the outer shape is cylindrical and has a collar, and a pair of bearing devices for supporting the raised collars 53, 54 outside the hollow shaft 44. Is.

Inside the cylinder 49, a piston 48 is incorporated so as to be free to move, and pressurized water is sent to the piston 48 to move the hollow shaft 44 integral with the piston 48 up and down. End plugs at both upper and lower ends
46 and 50 close the cylinder 49 and allow the hollow shaft 44 to slide through the O-ring. Holder on top of hollow shaft 44
The 33 has a built-in fiberscope.

The black light 34 and the lens barrel 35 both irradiate the inside of the stretch tube 16 through the prism and receive the light, respectively, and the fiber cable 4
It is connected to each device via 2, 43.

The distribution box 32 is surrounded by the inner wall of the distribution box and has a hollow shape. The space of the inner and outer walls is divided into four chambers by a partition 36, and acetone, washing water, dry air, and a penetrant liquid are placed from above. And are ejected from the discharge holes 37 toward the stretch tubes 16 by the pressure-feeding force.

The cylindrical frame 58 is a cylinder having an internal space, and is fixed to the large flange 65 at the lower end by welding or the like. In addition,
Although not shown, there are a pair of nuts that engage with the screw rods 66 and 67 on the outside of the large flange 65 in pairs. A thrust receiving device for the screw rods 66 and 67 is already installed outside the large flange 65 at the corresponding portion of the casing 10.

In FIG. 1, the portion indicated by the chain line shows the state where the hollow shaft 44 is lowered, and the cable and hoses whose lengths have been determined in advance by predicting the stroke of the piston 48 are the bottom end of the hollow shaft 44. Has a joint part by protruding to
It is connected to a separately installed tank facility for permeation inspection.

FIG. 2 is a detailed view of the upper portion of the inspection tool shown in FIG. 1, showing the hollow shaft 44 in a lowered state for storage. That is, the cover 80 is a keyed bush in advance.
Screw to the outer surface of 45. The upper hydraulic pipe 61 is for a cylinder, and the piston 48 descends when pressurized. The lower penstock 62 is useful when climbing.

FIG. 3 is a system diagram showing a connection state of the hoses 38 to 41. At the time of first cleaning, the acetone is fed from the acetone tank 68 to the distribution box 32 via the acetone hose 39. Compressed air may be used for this pressure source, for example.

Next, when washing with water, from the water tank 69 to the water hose
Use 41 to pump to distribution box 32 as well. The next penetrant is pumped from the fluorescent penetrant tank 70 using the penetrant hose 38. Similarly, at the time of inspection, the distribution state of the penetrant is checked with the fiberscope 71. In addition, washing is naturally performed from the water tank 69 via the water hose 41.

Next, at the time of drying, for example, high temperature, dry air passing through the heater 72 may be pressure fed by the air hose 40. After that, cooling time is required to clarify the penetrant flaw detection, and then the inspection based on the findings of the fiberscope 71 is performed.

FIG. 4 shows the fiberscope 71 in FIG.
3 shows a system diagram until monitoring by. holder
In the black light 34 and the lens barrel 35 in the lens barrel 35, the lens barrel 35 has a light-collecting prism 73 and a lens 74, and an image is picked up by the camera 75 by the fiber cable 43 and the video typewriter 76, if necessary. Etc. are printed, reproduced and recorded on the VCR 77, and broadcast on the monitor TV 78.

The black light 34 is used for illumination, and the light source is obtained from the light source device 79. In FIG. 4, since it is a dark place, it is preferable to use ultraviolet rays for illumination. This is called black light.

Next, an example of use of the above embodiment will be described. During the periodic inspection, some internal pumps are operated to cool the furnace, but most internal pumps are stopped. Out of the pumps that are out of operation, the pumps will be back-calculated from the service life to determine the order, and the pumps will be disassembled, inspected, and repaired sequentially. When the pump reaches its end of life, all pumps are disassembled, inspected,
Repair has been completed. Abnormalities are found even if no other accidents occur. Of course, priority is given to disassembly inspection and repair.

This inspection tool is prepared for this overhaul.
First, the tank equipment for gas-liquid repair, the water pressure pump equipment, and the fiberscope equipment are installed on the furnace bottom side, for example, the pedestal. Next, screw rod 6 for exclusive disassembly tool
Position 6 and 67 directly under the internal pump 5.

In the disassembling operation, the opening flange of the large-diameter pipe portion 10a of the casing 10 is opened, the water immersion motor 13 is pulled out, and then the opening flange is closed again, and the impeller 8 and the shaft 9 are pulled out by being filled with fresh water.

After that, a plug 31 is attached to the diffuser boss 15 part.
Fit, remove the clean water from the casing 10, open the flange of the large-diameter pipe portion 10a again, insert the handling tool with the screw rods 66 and 67, remove the secondary seal 20, and then tighten the nut 18. Release the engagement of the locked lock sleeve 19,
Remove the tightening nut 18.

Then, the handling tool is the screw rod 66,
After pulling it out at 67, this screw rod 66, 67 again
The flange of the inspection tool of this embodiment is screwed onto the screw rod, and the screw rods 66 and 67 are rotated by the lower speed reducer to raise the inspection tool. If necessary, the cover 80 of the inspection tool is removed, and the upper hydraulic pipe is also used. It is preferable to pressurize from the 61 side to pull down the hollow shaft 44 and prevent vertical swing.

After the insertion into the casing 10, the casing flange and the flange of the inspection tool are bolted and fixed. Next, the air hose 40, the water hose 41, the fiber cables 42 and 43, the acetone hose 39, the permeate hose 38, the upper hydraulic pipe 61, the lower hydraulic pipe 62, and the drain pipe 64 are respectively installed as tank equipment for gas-liquid replenishment with a hydraulic pump. Connect to equipment and equipment of Fiberscope 71.

Since the previous steps of the work have been completed, first, pressure is applied from the system of the lower hydraulic pipe 62 to push up the hollow shaft 44, stop the position as it is, and feed acetone under pressure to distribute the distribution box.
Acetone is jetted from the emission holes 37 of 32 to start cleaning. In this case, the motor 59 is excited, the cylinder is rotated, and then the hollow shaft 44 is also rotated.
Start spraying every corner inside the.

Next, water is drained from the lower hydraulic pipe 62 and pressurized from the upper hydraulic pipe 61, the hollow shaft 44 is gradually pulled down, and sprayed on the entire inner wall surface of the stretch tube 16 required. If you do this, dirt will start to come off during operation. Then, stop the acetone, send pressurized water for washing,
Move from top to bottom to wash with water.

After washing with water, the washing with water is stopped in the same manner as described above, and the penetrant is applied to the stretch tube 16 in the same manner as described above. In this case, in general, the coating of the penetrant without corners affects the quality of the subsequent flaw detection test, so that inspection is required once.

First, the black light 34 is emitted, the light is received by the lens, and it is lowered while rotating in the same manner as before.
Make sure that the penetrant is well applied. In this case, for example, with the video typewriter 76, the series No.
Etc., recorded on VCR 77, monitor TV 78
It will be aired on and checked by an inspector visually.

Next, water washing is performed again, but in the same manner as the above-mentioned water washing. After washing with water, send hot dry air under pressure and stretch tube while rotating and moving from top to bottom
Dry the inner wall surface of 16. Since the temperature of the wall surface also rises, wait for a while for cooling after drying, if necessary, for about 20 minutes or more. During standby, the motor is generally de-energized, and the hollow shaft 44 is pushed down to the lowest end.

The gas-liquid circuits are all stopped from the end in the order of working steps. After the lapse of the required time, the final inspection starts again, but for this reason, the hollow shaft 44 is pushed up again, the fiberscope 71 is made to function by licking from the upper part of the stretch tube 16, and the lower part is also broadcast on the monitor and inspected. Undergo an inspection.

If there is no abnormality, the inspection tool is accepted and the inspection tool is put in the initial state. That is, pressure is applied from the upper hydraulic pipe 61 to the lowermost end of the hollow shaft. Then, lower the distribution box for each holder of the fiberscope to the bush 45 with the key on the front surface of the cylinder 49 and ground it. If it is necessary to prevent vertical swinging as it is, keep the pump discharge side pressurized. To close the valve.

Then, after uncoupling the wiring and piping, the screw rod is rotated again, and with the inspection tool still mounted on the large-sized flange 65, it is pulled out from the casing 10 and the posterior screw rods 66, 67 are removed from the side of the flange. Remove the nut part of and free the inspection tool and store it in the specified storage location.

In the above work, it is generally more convenient to remove the connector and close it, if necessary, and use the open connector. It is convenient to store the cylinder 49 in a water-sealed state for a short period of time in a standby state or to store it, and there is little fear of corrosion. During the above work, the drain pipe 64 is opened, the open end is connected to the rad groove, each hose connected when the work is stopped is removed, and the drain pipe 64 is closed.

[0073]

As described above, according to the present invention, the apparatus can be downsized, can be easily attached and detached, and the same inspection as in the case of direct visual inspection by remote control can be performed. Furthermore, since it can be carried out immediately when disassembling the internal pump, the disassembling work process can be shortened.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of an internal pump inspection tool according to the present invention.

FIG. 2 is an enlarged elevational view showing a partially cross-sectional view of a state where the inspection tool in FIG. 1 is stored.

FIG. 3 is a block diagram for explaining an inspection process by the inspection tool in FIG.

4 is a block diagram showing a fiberscope inspection device in an inspection process in FIG.

FIG. 5 is a vertical sectional view showing a conventional internal pump.

[Explanation of symbols]

1 ... Reactor pressure vessel, 2 ... Stub tube, 3 ... Shroud, 4 ... Diffuser, 5 ... Internal pump, 6
... pump part, 7 ... motor part, 8 ... impeller, 9 ... shaft, 10 ... casing, 10a ... large diameter pipe part, 10b ... thin diameter pipe part, 11 ... rotor, 12 ... stator, 13 ... motor, 14
… Bearing, 15… Diffuser boss, 16… Stretch tube, 17… Female thread, 18… Tightening nut, 19… Lock sleeve, 20… Secondary seal, 21… Inner can, 22… Outer can, 23… Bolt, 24 … Motor flange, 25… Small flange, 26… Cooling water inlet pipe, 27… Leak water pipe, 28… High pressure water pipe, 29… Cooling water outlet pipe, 30… Stud, 31… Plug, 31
a ... hollow part, 31b ... hanging rod, 32 ... distribution box, 33 ... holder, 34 ... black light, 35 ... lens barrel, 36 ... partition,
37 ... Release hole, 38 ... Penetrant hose, 39 ... Acetone hose,
40 ... Air hose, 41 ... Water hose, 42, 43 ... Fiber cable, 44 ... Hollow shaft, 45 ... Bush with key, 46 ... Upper end plug, 47 ... Pressurized water passage, 48 ... Piston, 49 ... Cylinder,
50 ... Bottom end plug, 51 ... End cover, 52 ... End collar,
53, 54 ... Collar, 55 ... Gear, 56, 57 ... Metal, 58 ... Cylindrical frame, 59 ... Motor, 60 ... Pinion, 61 ... Upper hydraulic pipe, 62 ... Lower hydraulic pipe, 63 ... Drain pan, 64 ... Drain pipe , 65… Large flange, 66, 67… Screw rod, 68
… Acetone tank, 69… Water tank, 70… Fluorescent penetrant tank, 71… Fiberscope, 72… Heater, 73… Lighting prism, 74… Lens, 75… Camera, 76… Video typewriter, 77… Video deck, 78 … Monitor TV, 79…
Light source device, 80… Cover.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical indication location G21C 15/243 520 A 8607-2G (72) Inventor Shigeru Watanabe 4-7-Shiba, Minato-ku, Tokyo 7 Within Aitel Technology Services Co., Ltd.

Claims (1)

[Claims] 1. A stretch tube inserted into a small-diameter pipe portion of an internal pump casing, a plug closing an upper end of the stretch tube, and a stretch tube inserted from an inner surface of the plug into the stretch tube. A hollow shaft extending to the vicinity of the lower end, a distribution box having a discharge hole for various test liquids provided on the upper end surface of the hollow shaft, and a holder that holds the black light and the lens barrel through the distribution box. , With a black cable in this holder and a fiber cable connected to the lens barrel, various test liquid supply hoses for supplying various test liquids to the various test liquid discharge holes, and a key provided on the outer surface of the hollow shaft The bush, an end plug and a piston provided on the lower surface of the keyed bush and on the upper outer surface of the hollow shaft, and the end plug and the piston. And a cylinder provided on the outer surface of the piston, a cylindrical frame provided on the outer surface of the cylinder via a pair of upper and lower metals, a motor provided on the frame via a gear, the casing and the frame. An upper hydraulic pipe which is provided between the hollow shaft and the cylinder and is provided between the frame and the lower portion of the cylinder, and an upper hydraulic pipe which is provided between the hollow shaft and the cylinder. A drain pipe that discharges the various test liquids, and an end collar provided at the lower end of the hollow shaft that binds the outer surfaces of the fiber cable and various test liquid supply pipes that are led out from the lower end of the hollow shaft, An inspection tool for an internal pump, comprising: