JP4772400B2 - Inspection and repair method and inspection and repair device for nuclear reactor jet pump - Google Patents

Description

  The present invention relates to the inspection of the soundness of a jet pump installed in a reactor pressure vessel in a boiling water nuclear power plant (hereinafter referred to as a BWR plant) and the inspection of a reactor jet pump that performs repair work when a corrosion crack is found. The present invention relates to a repair method and an inspection repair device.

  Conventionally, in a BWR plant, in order to increase the power density of a nuclear reactor, a jet pump is provided in the downcomer section inside the reactor pressure vessel, and this jet pump is combined with a recirculation pump installed outside the reactor pressure vessel. In addition, a so-called jet pump system is employed.

  In a BWR plant employing such a jet pump system, driving water is supplied to the jet pump inside the reactor pressure vessel by a recirculation pump outside the reactor pressure vessel, and connected to the recirculation inlet nozzle of the recirculation pump. The power density is increased by forcibly circulating the coolant from the riser tube to the core.

FIG. 9 shows a configuration of a conventional general nuclear reactor jet pump.
In FIG. 9, reference numeral 1 denotes a reactor jet pump, and a plurality of reactor jet pumps are provided so as to surround the core shroud 3 in a downcomer portion 4 which is a cylindrical space between the reactor pressure vessel 2 and the core shroud 3.

Reference numeral 5 denotes an inlet nozzle of a recirculation pump (not shown). The inlet nozzle 5 extends through the side wall of the reactor pressure vessel 2 and is connected to the jet pump assembly.
One end of the inlet nozzle 5 in the reactor pressure vessel 2 is connected to a diffuser 10 via a riser pipe 6, a nozzle elbow 7, an inlet mixer 8, and an inlet mixer nozzle 9 of a jet pump.

Reference numeral 11 denotes a hanging ear for lifting the jet pump 1.
Since the internal structure of the furnace including such a jet pump is used in a severe environment of high temperature and high pressure, it is composed of a material having sufficient corrosion resistance and mechanical strength, such as austenitic stainless steel or nickel base alloy. Yes.

  However, even in such a reactor internal structure, components that are difficult to replace are exposed to harsh environments for a long period of time due to long-term operation of the plant, and are also affected by neutron irradiation. There is concern about material degradation.

Particularly in the vicinity of the welded portion of the internal structure of the furnace, there is a risk of potential stress corrosion cracking due to the sensitization of the material due to welding heat input and the influence of tensile residual stress.
Since there is a similar concern for the jet pump that circulates the primary coolant, it is necessary to perform repair work when checking the integrity of the inner surface of the jet pump and finding corrosion cracks.

In general, when performing inspection / repair work on the inner surface of a jet pump, the conventional inlet mixer 8 is removed and an inspection / repair device is inserted inside, or an inspection / repair device is inserted into the diffuser 10 from the lower part of the pressure vessel. It is necessary to do this (for example, see Patent Documents 1 and 2).
There is also an example in which an inspection / repair device is inserted through the opening gap of the inlet mixer nozzle 9 without removing the inlet mixer 8 (see, for example, Patent Documents 3, 4, and 5).
JP-A-5-209864 JP 2003-185784 A JP 2001-65778 A JP 2002-311183 A JP 2004-251894 A

  However, these conventional inspection / repair devices can inspect and repair only the inner surface of the diffuser 10 that is a part of the jet pump 1, and it is difficult to inspect and repair the riser pipe 6.

  In the inspection and repair device for the inner surface of the jet pump 1 described above, when all the inner surfaces of the jet pump 1 including the riser pipe 6 are to be inspected and repaired, it is necessary to remove the inlet mixer 8.

  However, it takes a lot of labor and time to remove and reassemble the inlet mixer 8, so that the inspection and repair of the jet pump 1 becomes troublesome, and the time spent for the inspection and repair may interfere with the operation of the BWR plant. There was a problem.

  The present invention has been made in order to solve the above-described problems, and it is possible to easily perform a soundness confirmation inspection and repair work on the inner surface of the entire jet pump including the riser pipe in a short time without removing the inlet mixer. An object of the present invention is to provide an inspection / repair method and an inspection / repair apparatus for a nuclear reactor jet pump that can be performed and improve the safety of a BWR plant.

In order to achieve the above object, according to a first aspect of the present invention, a flexible cable is coupled to a tool head on which an inspection / repair tool is mounted, and at least a part of the flexible cable can be rotated by a connecting joint. When connecting the flexible feed rod and inspecting and repairing the inner surface of the diffuser, when extending the flexible cable and the feed rod substantially linearly and inserting the tool head into the diffuser, and when inspecting and repairing the inside of the riser pipe the inserted into the diffuser fold the flexible cable and the feed rod to overlap the magnetic coupling means attached to the flexible cable and feed rod, and said flexible cable and feed rod by pulling up the subsequent delivery rod Isolated and two The head through an inlet mixer nozzle, characterized in that so as to insert into the riser pipe.

The invention according to claim 2 is a tool head on which an inspection / repair tool is mounted, a flexible cable coupled to the tool head, and at least a part of the flexible cable is rotatably coupled to the flexible cable by a connecting joint. a feed rod with a flexible, said consists of a flexible cable and the magnetic coupling means attached to feed rods, substantially linear and feed rod and the flexible cable when the work inspected repair diffuser inner surface inserted into the diffuser stretched Jo, when the work inspected repair riser tube is inserted into the diffuser folded to overlap the previous Ki磁 gas coupling means and feeding the rod and the flexible cable, then Flexible by pulling up the feed rod Separating the the feed rod Buru, characterized in that the tool head to be inserted into the riser pipe through the inlet mixer nozzle.

  According to the present invention, it is possible to perform a soundness check and repair work on the inner surface of the entire jet pump including the riser pipe and repair work in a short time without removing the inlet mixer, and the safety of the BWR plant. Can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of an inspection / repair device for a reactor jet pump according to a first embodiment of the present invention.

  An inspection / repair apparatus for a reactor jet pump according to the present embodiment includes a tool head 21 equipped with an inspection / repair tool such as an inspection sensor or a repair mechanism, and is coupled to the tool head 21 to be active or passive. A flexible cable 22 that can be bent, a connection joint 23 that is rotatably coupled to the flexible cable 22 and performs passive rotation, a weight 24 attached to the connection joint 23, and the connection joint 23. At least a part of the flexible cable 22 is rotatably joined to the flexible cable 22, and a flexible feed rod whose position angle relative to the flexible cable 22 is adjustable so that the rotational angle with the flexible cable 22 can be changed. 25 and the connecting end of the feed rod 25 to the connecting joint 23 And a side opposite annular hook-shaped hanger 26 for attached to the end of the.

  The feed rod 25 may be made of a flexible material, but may be a flexible rod combined with a flexible joint.

  As will be described later, the flexible cable 22 is inserted into the jet pump 1 from the tip of the inlet mixer nozzle 9, and is sufficiently long to wrap around the curved wall of the nozzle elbow 7 and reach the lower end of the riser pipe 6. The feed rod 25 is formed longer than the flexible cable 22.

  A signal line for information transmission connecting an inspection / repair tool mounted on the tool head 21 and an external control device, an air tube for power supply, a power line, and the like are the flexible cable 22, the feed rod 25, and an external not shown. The wire rope is arranged so as to be attached to the wire rope, and is taken up and fed out by a take-up device (not shown) as the inspection / repair device is lifted or hung.

Next, the operation of the inspection / repair device configured as described above will be described.
In general, when carrying out the soundness check inspection and repair work of the jet pump by the inspection / repair device, there are two modes: a mode in which the inner surface of the diffuser 10 of the jet pump 1 is a work target and a mode in which the inner surface of the riser pipe 6 is a work target There are two modes of operation.

FIG. 2 is a view showing a form in the case where the inner surface of the diffuser 10 is an inspection / repair work target.
When working on the inner surface of the diffuser 10, as shown in FIG. 2, first, the tool head 21 is directed vertically downward, and the flexible cable 22 and the feed rod 25 are extended substantially linearly at the connecting joint 23. To do.

  In this state, the working force applied to the weight 24 attached to the connection joint 23 is suspended by hanging the entire inspection / repair device by a non-illustrated fuel exchanger auxiliary hoist or the like installed in the upper part of the furnace with a wire rope (not shown) attached to the lifting tool 26. Use it to raise and lower and position the inspection and repair equipment.

  The tool head 21 is passed together with the flexible cable 22 through the guide hole 28 of the insertion guide mechanism 27 disposed in the inlet mixer nozzle 9 while positioning the inspection / repair device, and the flexible cable 22 and the tool head 21 are connected by the feed rod 25. Into the diffuser 10.

  The insertion guide mechanism 27 is installed on the upper part of the jet pump so as to hang a wire rope on a guide suspension 29 provided on the insertion guide mechanism 27 and hang it from the upper part of the furnace so as to fit into the gap of the inlet mixer nozzle 9. It is the same as the mechanism (Japanese Patent Laid-Open No. 2001-159696), and the inlet portion 30 and the outlet portion 31 into which the inspection / repair device for the guide hole 28 is inserted are communicated and guided in a smooth shape. The inspection / repair device can be easily inserted into the opening gap of the inlet mixer nozzle 9.

  Since the flexible cable 22 and the feed rod 25 are flexible structures, the flexible cable can be used with respect to a bent portion in the guide hole 28 of the insertion guide mechanism 27 and an angular deviation between the insertion direction and the diffuser axial direction. 22 and the feed rod 25 itself can be easily fed into the inside by bending.

  Further, the flexible cable 22 uses a known technique used in an endoscope or the like, and has an active flexibility so that the tip of the tool head 21 side can be bent in an arbitrary direction by pulling a plurality of wires. It is good also as a structure to have.

  As shown in FIG. 3, the tool head 21 is opened by a pneumatic cylinder 32 at an appropriate opening angle, or is closed in the opposite direction, and three or more support arms 33 are accommodated by pins 34 at equal intervals. A rotationally supported fixing mechanism is attached.

  With the fixing mechanism in the retracted state, the tool head 21 is inserted to a predetermined position in the diffuser 10 and the support arm 33 of the fixing mechanism is opened at that position, whereby the tip of the support arm 33 is pressed against the inner wall of the diffuser 10. The tool head 21 can be stably fixed at that position.

The inspection / repair tool 35 is attached to the tip of the support arm 33 of the fixing mechanism, and is provided at a joint portion between the tool head 21 and the flexible cable 22, and a turning motor 36 for turning the tool head 21 in the circumferential direction. The inspection and repair tool 35 is scanned spirally with respect to the inner wall surface of the diffuser 10 by the operation and the position adjustment operation of the tool head 21 along the longitudinal direction of the diffuser 10 by inserting and extracting the tool head 21. It can be moved and fixed in position.
The method for fixing the position of the tool head 21 is not limited to the above-described support method for the support arm, but may be implemented by other methods or may not have a fixing mechanism depending on the work contents.

  It is also possible to manipulate the position and orientation of the tool head 21 with the flexible cable 22 having active flexibility. For example, for the purpose of visual inspection with a video camera, the position fixing mechanism of the tool head 21 is not necessary, and by attaching the video camera to the tip of the flexible cable 22 and changing the posture of the tip of the flexible cable 22, any desired position can be obtained. It is possible to photograph the inner wall surface in the position and direction.

  The inspection tool mounted on the tool head 21 is a video camera with a light source or an image fiber, an array type ultrasonic probe, an eddy current probe, a laser ultrasonic probe, etc., and a repair tool is water. A cleaning nozzle, a grinding grinder, a laser decontamination device, a laser surface modification device, a laser welding device, and the like may be selected in accordance with a desired operation.

In order to pull out the inspection / repair device from the diffuser 10 after the work is completed, a wire rope (not shown) hung on the feed rod 25 is lifted from the upper part of the furnace, thereby feeding the guide hole 28 of the insertion guide mechanism 27 into the guide hole 28. The rod 25, the flexible cable 22, and the tool head 21 can be passed through in order.
With the above apparatus configuration and working method, it is possible to carry out any inspection work or repair work at any location on the inner surface of the diffuser in the jet pump.

Next, FIG. 4 shows an embodiment in which the inner surface of the riser pipe 6 is a work target.
When the inner surface of the riser pipe 6 is to be worked, first, the flexible cable 22 is first rotated 180 ° at the connecting joint 23 so that the tool head 21 is directed vertically upward so that the flexible cable 22 and the feeding rod 25 overlap. In the folded state, the flexible cable 22, the tool head 21, and the feeding rod 25 are inserted into the guide hole of the insertion guide mechanism 27 in the same manner as on the diffuser side by utilizing the gravity acting on the weight 24 attached to the connection joint 23. It is once sent into the diffuser 10 through 28.

  When the inspection / repair device has been inserted until the tool head 21 part completely enters the diffuser 10, this time, the insertion direction of the tool head 21 is reversed by pulling up the feed rod 25 contrary to the insertion.

  By reversing the movement of the tool head 21, the overlap of the feed rod 25, the tool head 21 and the flexible cable 22 is separated at the tip of the inlet mixer nozzle 9, and the feed rod 25 is further lifted to enter the inlet mixer nozzle 9. The tool head 21 is guided and further guided into the nozzle elbow 7 arranged above the inlet mixer nozzle 9.

  Further, the force that pushes the tool head 21 into the nozzle elbow 7 is transmitted by pulling up the feed rod 25 as it is, and the flexible cable 22 is bent when the tool head 21 slides in contact with the curved inner wall surface of the nozzle elbow 7. Is guided into the riser tube 6.

  Since the flexible cable 22 is fed into the riser pipe 6 by pulling up the feed rod 25, the tool head 21 can be lowered by this, and conversely, the tool head 21 is fed by feeding the feed rod 25 into the diffuser 10. Can be raised.

  In the state where the tool head 21 is in the riser pipe 6, the tool head 21 is vertically downward, and in the same manner as when the diffuser 10 side is the work target, any inspection work on any part of the inner surface of the riser pipe 6 is performed. Repair work can be carried out.

  In addition, when the flexible flexibility is given to the flexible cable 22 as described above, the flexible cable 22 has the same curvature as that of the nozzle elbow 7 when passing through the nozzle elbow 7, thereby smoothly inspecting and repairing. The device can be fed.

  In order to take the inspection / repair device out of the jet pump after completion of the inspection / repair work, the flexible cable 22 and the feed rod 25 are moved downward in the diffuser 10 by utilizing the gravity acting on the weight 24 coupled to the connecting joint 23. Until the tool head 21 passes through the inlet mixer nozzle 9 and returns to the diffuser 10.

  Thereafter, by lifting the feeding rod 25 from the upper part of the furnace, the tool head 21, the flexible cable 22 and the feeding rod 25 can be brought together to pass through the guide hole 28 of the insertion guide mechanism 27 and the entire apparatus can be taken out.

In this case, when the tool head 21 is separated from the feed rod 25 and fed into the inlet mixer nozzle 9, and when the tool head 21 is pulled together with the feed rod and pulled into the guide hole 28, the position where the feed rod 25 is moved. It can be easily done by finely adjusting.
By the above operation method, arbitrary inspection work and repair work can be carried out at any location on the inner surface of the riser pipe 6 in the jet pump 1.

  Further, by combining with the inspection / repair work on the diffuser 10 side, the inspection / repair work over the entire inner surface of the jet pump 1 can be performed without disassembling the jet pump 1, and the inlet mixer 8 is removed and reattached. A great reduction in labor and time can be achieved.

Next, a second embodiment of the present invention will be described with reference to FIG.
As described above, when the inspection / repair device is inserted into the riser pipe 6, the tool head 21 needs to bend and pass by sliding while contacting the curved inner wall surface of the nozzle elbow 7, but it is bent in one direction. This can be achieved if there is a degree of freedom.

However, in the case of the flexible cable 22 having flexibility described above, since it has three bending degrees of freedom of bending in two directions and twisting around the longitudinal axis, when the flexible cable 22 is pushed into the nozzle elbow 7, In particular, there is a risk of bending in an unexpected direction between the inlet mixer nozzle 9 position and the connecting position with the feed rod 25.
In the present embodiment, instead of the flexible cable 22, a multi-node body is used in which a plurality of rigid links 37 are connected via a rotary joint 38 with one degree of freedom.

The rotary joint 38 may have passive flexibility in which spring mechanisms 39 are arranged on both sides in the rotational direction so that the multi-node body returns to an upright state, or a tensile force by two wire ropes. Alternatively, active flexibility may be provided by using a method of attaching an actuator such as a motor to each rotary joint 38.
Further, a cylindrical cover having flexibility and stretchability may be provided around the spring mechanism 39 so as not to interfere with the inner surface of a jet pump or the like.

  By restricting the bending direction to one direction in this way, it is possible to prevent the rigid body link 37 from being bent at a place other than the nozzle elbow 7 due to the pushing force when the inspection / repair device is sent into the riser pipe 6. The inspection and repair device can be smoothly fed into the riser pipe 6.

Next, a third embodiment of the present invention will be described with reference to the drawings.
In the inspection / repair device shown in FIG. 1, a magnet is attached to the feed rod 25, and a ferromagnetic material is attached to the flexible cable 22 so as to face the magnet.

  By adopting such a configuration, when the feed rod 25 and the flexible cable 22 are folded at the connection joint 23 in the form in which the inner surface of the riser pipe 6 is a work object, the feed rod 25 and the flexible cable 22 act on the magnetic force. Overlapping and integrating.

  In this way, when the flexible cable 22 that is overlapped and integrated by the action of magnetic force is inserted into the inlet mixer nozzle 9, the tip of the inlet mixer nozzle 9 enters between the flexible cable 22 and the feeding rod 25, so that the flexible cable 22 22 is separated from the feeding rod 25 against the magnetic force, and the feeding rod 25 is separated into the insertion guide mechanism 27.

  By doing so, it is possible to prevent the flexible cable 22 from being bent at a place other than the inlet mixer nozzle 13 when the tool head 21 is pushed into the riser pipe 64, so that the feeding force cannot be transmitted.

Further, when the tool head 21 that has been in the riser pipe 6 is pulled out, the flexible cable 22 and the feeding rod 25 are adsorbed and integrated below the nozzle tip position. Even when it is pulled out, it can be easily passed through the guide hole 28 of the insertion guide mechanism 27.
In addition, it is good also as a structure which couple | bonds and isolate | separates mechanically instead of using magnetic force.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
In FIG. 6, reference numeral 40 denotes a nozzle for injecting high-pressure water attached to the tool head 21. A high-pressure water cable 41 for conveying high-pressure water to the high-pressure water injection nozzle 40 is provided along the flexible cable 22 and the feed rod 25. It is connected to a water supply device (not shown) having a function of adjusting the amount of flowing water installed outside.

  In the nuclear reactor jet pump inspection / repair device having such a configuration, the tool head 21 obtains thrust by injecting water sent from the water supply device from the high-pressure water injection nozzle 40 with an arbitrary injection pressure. The tool head 21 can be moved.

  In particular, when the inner surface of the riser pipe 6 is to be inspected and repaired, the flexible cable 22 may be bent at a place other than the nozzle elbow 7 only by applying a pushing force from the feeding rod 25 to the flexible cable 22. By providing the head 21 with a propulsion function and pulling the flexible cable 22 into the riser pipe 6 by this propulsive force, the inspection / repair device can be smoothly fed.

  Further, three or more high-pressure water injection nozzles 40 are arranged around the tool head 21 and the injection pressure of each high-pressure water is controlled to move the movement direction of the tool head 21 in an arbitrary direction. Therefore, the workability of insertion can be improved.

Next, a fifth embodiment of the present invention will be described with reference to FIG.
In FIG. 7, reference numeral 42 denotes a buoyancy adjuster that is attached to the tip of the tool head 21 and is a hollow body that can adjust buoyancy by taking in and out air.

The buoyancy adjusting body 42 has a hollow structure in which a through hole 43 communicating with an internal cavity and the outside is formed on the surface, and air is injected into the inside through an air tube 44 drawn from the ground. The buoyancy can be obtained in the water.
Conversely, when air is sucked from the outside via the air tube 44, the air inside is sucked out and water from the outside is injected through the through hole 43, so that buoyancy is lost.

  In the reactor jet pump inspection / repair device having such a configuration, when the inner surface of the riser pipe 6 is a work target, the tool head 21 is lifted vertically upward when passing through the inlet mixer 8 from the diffuser 10 side. On the other hand, when passing through the inlet mixer 8 and entering the riser pipe 6, a force is required to sink the tool head 21 vertically downward.

  Therefore, in the former state, the inside of the buoyancy adjusting body 42 is filled with air so that the tool head 21 obtains buoyancy and the force works vertically upward, and in the latter state, air is sucked and the inside is filled with water. By satisfying the condition, the buoyancy of the tool head 21 is eliminated and a force is exerted in the vertically downward direction due to its own weight, so that the inspection / repair device can be smoothly fed into the riser pipe 6.

  The buoyancy adjusting body 42 can be incorporated not only in the tool head 21 but also in the flexible cable 22 or the multi-joint body in place of the flexible cable 22 to increase the buoyancy adjusting effect.

Next, a sixth embodiment of the present invention will be described with reference to FIG.
Although the shape of the jet pump for each plant is substantially the same, there are a type in which the number of inlet mixer nozzles 9 is one and a type in which five are arranged circumferentially depending on the power generation scale of the plant.

  The type with one inlet mixer nozzle 9 has a nozzle inner diameter of about φ75 mm, whereas the five types have a very thin pipe with an inner diameter of about 30 mm, and inspection and repair equipment due to its narrowness. Is difficult to pass.

In the present embodiment, a nozzle insertion guide mechanism for allowing the inspection / repair device inserted on the diffuser 10 side to easily pass through the inlet mixer nozzle 9 is used.
This nozzle insertion guide mechanism includes an annular ring 45 fitted to the inlet mixer nozzle 9, a guide spring 46 composed of a plurality of rod-like or plate-like springs that are coupled to the outer side and spread outward, and prevents the guide springs 46 from spreading. A ring 47 that is bundled together, a slide mechanism 47 that moves the ring 47 in the annular axis direction by a pneumatic cylinder or the like, and an operation rod 48 that is operated from the top of the furnace.

  The ring 47 for bundling the guide springs 46 has an extent so that the ring 47 is further away from the annular coupling portion due to the spring force, and the spread of the guide spring 46 can be adjusted by sliding the position of the ring 47. Yes.

  This nozzle insertion guide mechanism is operated from the top of the furnace using the operation rod 49, and the inlet spring 46 is inserted into the jet pump through the opening gap of the inlet mixer nozzle 9 and passed through the inspection and repair device. The nozzle 9 is fitted.

  At this time, the position of the ring 47 that bundles the springs is slid away from the ring 45 so that the guide spring 46 can pass through the opening gap, and is inserted from a position that does not interfere with the inspection / repair device.

After the guide spring 46 is fitted to the inlet mixer nozzle 9, this time, the ring 47 is slid to the vicinity of the ring so that the spring spreads.
By doing so, it becomes a funnel-shaped guide guide having an inlet having a diameter larger than the inner diameter of the inlet mixer nozzle 9, and the inspection / repair device can be easily guided into the inlet mixer nozzle 9.

1 is a front view showing a jet pump inspection / repair device according to a first embodiment of the present invention. Sectional drawing which shows the form in the case of working the diffuser inner surface by the inspection and repair apparatus of the jet pump by the 1st Embodiment of this invention. The front view which shows the tool head of the inspection repair apparatus of the jet pump by this invention. Sectional drawing which shows the form in case the inner surface of the riser pipe | tube by the test | inspection repair apparatus of the jet pump by the 1st Embodiment of this invention is made into work object. The front view which shows the principal part of the test | inspection repair apparatus of the jet pump by the 2nd Embodiment of this invention. The front view which shows the principal part of the test | inspection repair apparatus of the jet pump by the 4th Embodiment of this invention. The front view which shows the principal part of the test | inspection repair apparatus of the jet pump by the 5th Embodiment of this invention. The front view which shows the principal part of the test | inspection repair apparatus of the jet pump by the 6th Embodiment of this invention. It is a figure which shows the conventional common jet pump, (a) is a front view, (b) Side sectional drawing.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Jet pump, 2 ... Reactor pressure vessel, 3 ... Core shroud, 4 ... Downcomer part, 5 ... Inlet nozzle, 6 ... Riser pipe, 7 ... Nozzle elbow, 8 ... Inlet mixer, 9 ... Inlet mixer nozzle, 10 ... Diffuser , 11 ... Suspended ear, 21 ... Tool head, 22 ... Flexible cable, 23 ... Connection joint, 24 ... Weight, 25 ... Feed rod, 26 ... Suspension tool, 27 ... Insertion guide mechanism, 28 ... Guide hole, 29 ... Guide suspension 30 ... Inlet part, 31 ... Outlet part, 32 ... Pneumatic cylinder, 33 ... Support arm, 34 ... Pin, 35 ... Inspection and repair tool, 36 ... Swivel motor, 37 ... Rigid link, 38 ... Rotary joint, 39 ... Spring mechanism, 40 ... high pressure water injection nozzle, 41 ... high pressure water cable, 42 ... buoyancy adjuster, 43 ... through hole, 44 ... air tube, 45 Circle ring, 46 ... guide spring, 47 ... ring, 48 ... slide mechanism, 49 ... operation rod.

Claims (5)

A flexible cable is coupled to a tool head on which an inspection / repair tool is mounted, and a flexible feed rod is coupled to the flexible cable so that at least a part of the flexible cable can be rotated by a coupling joint.
When inspecting and repairing the inner surface of the diffuser, the flexible cable and the feed rod are stretched substantially linearly and the tool head is inserted into the diffuser.
By when examining repairing the riser pipe is the insert and the flexible cable and feed rod into said diffuser folded to overlap the magnetic coupling means attached to the flexible cable and feed rod, pulling thereafter feeding rod A method for inspecting and repairing a nuclear reactor jet pump, wherein the flexible cable and the feed rod are separated, and a tool head is inserted into a riser pipe through an inlet mixer nozzle . A tool head on which an inspection / repair tool is mounted; a flexible cable coupled to the tool head; a flexible feed rod having at least a part of which is rotatably coupled to the flexible cable by a coupling joint; consists of a magnetic coupling means attached to the flexible cable and feed rod,
When the inner surface of the diffuser is to be inspected and repaired, the flexible cable and the feed rod are stretched substantially linearly and inserted into the diffuser.
When the work inspected repair riser tube is inserted into the diffuser folded to overlap the previous Ki磁 gas coupling means and feeding the rod and the flexible cable, and the flexible cable by pulling the subsequent feeding rod An inspection / repair device for a nuclear reactor jet pump characterized in that the feed rod is separated and the tool head is inserted into the riser pipe through an inlet mixer nozzle . Of claim 2 Symbol mounting reactor jet pump, characterized in that the high-pressure water jet nozzle capable of obtaining a thrust in water to the tool head is arranged positions shifted by three or more around the tool head Inspection repair equipment. Inspection repair device for reactor jet pump according to claim 2 or 3, wherein further comprising a buoyancy body in the tool head. A ring that fits into the inlet mixer nozzle, a guide spring mechanism composed of a plurality of springs that are coupled to and spread outward, a ring that bundles the springs so as not to spread, and a ring that slides in the direction of the ring axis. The reactor jet pump according to any one of claims 2 to 4, wherein the tool head is fed into the inlet mixer nozzle by using an apparatus insertion guide mechanism having a mechanism for adjusting the spread of the guide spring mechanism. Inspection repair equipment.

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