JP4664770B2 - Laser maintenance equipment - Google Patents

Description

  The present invention relates to a laser flaw detection inspection and preventive maintenance technology that can share laser ultrasonic nondestructive inspection and laser preventive maintenance, and more particularly to a laser maintenance apparatus capable of performing flaw detection inspection and preventive maintenance without replacing the apparatus.

  One way to ensure the continued soundness of the tubular structure inside the reactor is to first non-destructively inspect and measure the structure for cracks and material deterioration, and then to the structure. Applying reforming and processing technology to prevent the occurrence of cracks and deterioration.

  Hereinafter, an in-core instrumentation cylinder will be described as a typical in-reactor tubular structure.

  The in-core instrument tube is a guide tube that guides a sensor that measures the neutron flux, etc., near the reactor core of a pressurized water nuclear power plant from the outside of the reactor to the core, and is welded and joined through the bottom of the reactor vessel. . The neutron flux in the core is a parameter that directly indicates the operating status of the reactor, and it is important from the viewpoint of stable plant operation to ensure the soundness of the in-core instrumentation cylinder related to this measurement.

  A nondestructive inspection device for an in-core instrument tube has been proposed in Japanese Utility Model Registration No. 2590283 (Patent Document 1) (see FIGS. 18 and 19). This apparatus is a non-destructive inspection apparatus 3 that can be moved up and down for inspecting an in-core instrument tube 2 located at the bottom of a reactor vessel 1 and includes an elongated cylindrical main body 4. A guide device 6 having a sensor 5 for inspecting the in-core instrumentation cylinder 2 at the front end and a sensor insertion for inserting / extracting the inspection sensor 5 from the in-core instrumentation cylinder 2 in the main body 4. A pulling device 7 and a turning device 8 for turning the inspection sensor 5 in the in-core instrumentation tube 2 are provided, and a clamp device 9 for the in-core instrumentation tube 2 is provided at the lower end of the main body 4. This is a nondestructive inspection device 3 for an in-core instrumentation cylinder 2.

  Laser technology, on the other hand, takes advantage of its high energy density, peak power, coherence, coherent straightness, and other features to detect structure cracks, crack dimensions, stress measurements, material composition measurements, and distance measurements. , Vibration measurement, shape measurement, temperature measurement and other in-reactor material inspection and measurement, or material surface stress improvement, solution treatment, cladding, removal of deposits, polishing, crack removal, crack sealing, welding, It can be used for reforming and processing of materials in the reactor such as cutting (for example, “Mr. Sano et al .:“ Reactor underwater maintenance technology using laser ”, welding technology, May 2005 issue, pages 78-82). (2005) "; Non-Patent Document 1).

  In principle, these laser technologies are used when the object is difficult to access, such as high temperatures, high places, high radiation fields, and complicated shapes, or where access is poor and remote non-contact methods are required. This is an effective method. The use of optical fiber technology (such as Yoda et al .: “20MW laser pulse by optical fiber” is also applicable to areas where it is difficult to spatially transmit the laser beam to the target area, such as narrow spaces, the inside of shielding, and the inner surface of piping. And its application ", Laser Research, Vol. 28, No. 5, P. 309-313 (2000); Non-Patent Document 2), it is shown that it can be efficiently realized.

  In particular, there is a laser ultrasonic method as a nondestructive inspection method using laser technology. In this laser technology, ultrasonic waves are transmitted using distortion generated when pulsed laser light is applied to the structural material, and the interference effect of the receiving laser light separately applied to the structural material is used. The ultrasonic wave is measured as a vibration signal, for example, “Mr. Yamawaki:“ Laser ultrasonic wave and non-contact material evaluation ”, Journal of Japan Welding Society, Vol. 64, No. 2, P. 104-108 (1995)”. It is known from Non-Patent Document 3 and the like. The ultrasonic waves transmitted / received in this way can be used for various crack inspections and material measurements of structures, similarly to the ultrasonic waves transmitted / received by a normal contact type element.

  As a defect inspection method using a laser ultrasonic method, a surface inspection apparatus disclosed in Japanese Patent Laid-Open No. 2000-180418 (Patent Document 2) has already been known. This surface inspection device is a method of finding the crack of the structural material to be measured from the reflected echo reflected by the crack of the structural material, and the transmission / reception position of the laser with respect to the detected crack of the structural material. It is related with the technique which can measure the depth of a crack from the ultrasonic wave propagation characteristic excited by irradiating a laser so that it may be inserted.

As a nondestructive inspection method for a tubular structure in a furnace using a laser ultrasonic method, a laser irradiation apparatus disclosed in Japanese Patent Application Laid-Open No. 2005-40809 (Patent Document 3) is known. As shown in FIG. 20, this laser irradiation apparatus uses an ultrasonic transmission laser beam (hereinafter referred to as a transmission laser beam L ₁ ) and an ultrasonic reception laser beam (hereinafter referred to as “transmission laser beam L ₁ ”) for a tubular structure to be inspected. , _Two laser beams of the received laser beam L ₂ ), and the crack of the target part is inspected using the excited ultrasonic signal.
Utility Model Registration No. 2590283 JP 2000-180418 A Japanese Patent Laying-Open No. 2005-40809 Sano, Makino, Ochiai, Yamamoto: "Reactor underwater maintenance technology using lasers", welding technology, May 2005, P.I. 78-82 (2005) Yoda, Sano, Mukai, Schmidt-Uhlig, T .; , Marowsky, G .; : “Transmission of 20 MW laser pulse by optical fiber and its application”, Laser Research, Vol. 5, P.I. 309-313 (2000) Yamawaki: “Laser ultrasonic waves and non-contact material evaluation”, Journal of the Japan Welding Society, Vol. 2, P.I. 104-108 (1995)

  As described in Utility Model Registration No. 2590283, the non-destructive inspection device for in-core instrumentation cylinders easily realizes non-destructive inspection of in-core instrumentation tubes by using the inspection sensor 5 having a known structure. Is possible.

  However, even if no cracks are found in the structural material in the nondestructive inspection of the actual in-core instrumentation cylinder, it may be desirable to perform preventive maintenance to prevent the structural material from cracking in the future. For example, it is very common to apply laser technology to preventive maintenance such as stress improvement on the surface of a structural material (laser peening technology: see [Non-Patent Document 1]). In the non-destructive inspection device 3 of the in-core instrumentation cylinder 2 using 5, it is necessary to prepare a laser maintenance device separately from the non-destructive inspection device 3, and perform the work by replacing the device for each inspection work or maintenance work. is there. The replacement of the non-destructive inspection device and the laser maintenance device every time the work is performed, there is a problem that the work process is prolonged and costs are increased when considering the entire work from inspection to preventive maintenance.

  On the other hand, with regard to the laser ultrasonic flaw detector, although the basic equipment configuration, flaw detection technique, and elemental technology used for flaw detection inspection of the cylinder inner surface of the in-furnace instrumentation cylinder have been proposed, the furnace combined with laser preventive maintenance No whole system has been proposed as a nondestructive inspection device for internal instrumentation cylinders.

  The present invention has been made in consideration of the above-mentioned circumstances, and is capable of sharing most of the apparatus for nondestructive inspection such as laser ultrasonic flaw detection and preventive maintenance such as improvement of stress on the material surface by laser. A maintenance device is provided.

In order to solve the above-described problem, the laser maintenance apparatus of the present invention comprises a laser light source and an optical system and oscillates laser light, while the laser light irradiation conditions are flaw detection inspection and A laser system that can be changed to an irradiation condition that enables preventive maintenance, an optical transmission unit that transmits laser light oscillated from the laser system, and a laser irradiation that irradiates the target site with the laser beam transmitted by the optical transmission unit Means , a transport / scanning mechanism for transporting the light transmission means and the laser irradiation means to the target site, and scanning within an arbitrary range of the target site, and an operation panel for controlling / monitoring the scanning operation of the transport / scanning mechanism, A work carriage that positions and transports the transport / scanning mechanism one-dimensionally or two-dimensionally with respect to the object from above the furnace vessel, and the transport / scanner Includes a polygonal main body casing having at least one open side, a seat for seating the transport / scanning mechanism, a cable for transmitting the optical transmission means and a power / control signal for scanning operation. A guide mechanism for guiding the laser irradiation means, an insertion tube for inserting the laser irradiation means installed at the tip of the main body casing into a target site, and raising and lowering the laser irradiation means through the insertion tube. A vertical drive mechanism and a rotational drive mechanism that rotate, a seating detection unit that detects that the seating base of the transport / scan mechanism is seated on a target, and a drive fixing mechanism that fixes the transport / scan mechanism to the target after sitting the is characterized in that it comprises.

  The laser maintenance apparatus of the present invention eliminates the need to replace the apparatus every inspection work or maintenance work, and can efficiently and efficiently carry out the inspection work and maintenance work, thereby shortening the work process and thereby reducing the cost. Can do.

  An embodiment of a laser maintenance apparatus of the present invention will be described with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 is an overall configuration diagram showing a first embodiment of a laser maintenance apparatus of the present invention.

  The laser maintenance apparatus 10 is applied to preventive maintenance such as flaw inspection of an in-core instrument tube such as a reactor tubular structure of a boiling water reactor or a pressurized water reactor, and stress improvement of a material surface. Device. FIG. 1 shows an example in which a reactor tubular structure laser maintenance device 10 is applied to an in-core instrument tube 12 in a reactor pressure vessel 11 of a boiling water reactor. The present invention can be similarly applied to an in-core instrument tube in a reactor vessel of a pressurized water reactor.

  The reactor pressure vessel 11 is accommodated in the reactor building 14, and a reactor well 15 is formed above the reactor pressure vessel 11. Reactor water 16 is stretched in the reactor well 15 and the reactor pressure vessel 11. An operation floor 18 is formed above the reactor well 15, and a work carriage 14 is provided on the operation floor 18 so as to be movable one-dimensionally or two-dimensionally.

Also, a maintenance or inspection / maintenance laser system 20 constituting a laser ultrasonic sensing system is installed on an operation floor 18 in the reactor building 14. The laser system 20 constitutes a laser light source and an optical system for inspecting, measuring, modifying, and processing a target portion of the tubular structure in the reactor. A flaw detection signal processing system 21 that performs processing such as processing, display, analysis, and recording of flaw detection signals received by the laser system 20 and an operation panel 22 that controls and monitors the scanning operation of the transport / scanning mechanism 23 are provided on the operation floor 18. Is provided. The maintenance laser system 20 includes laser ultrasonic waves such as an ultrasonic transmission laser light source (hereinafter referred to as a transmission laser light source), an ultrasonic reception laser light source (hereinafter referred to as a reception laser light source), and an ultrasonic reception interferometer . Elements necessary for transmitting and receiving ultrasonic signals by the method.

  Furthermore, the reactor well 15 and the reactor pressure vessel 11 are filled with the reactor water 16, and an in-core instrument tube 12 as a tubular structure inside the reactor is provided at the lower part (lower mirror part) of the reactor pressure vessel 11. Is installed. The in-core instrument tube 12 guides a neutron instrumentation tube (not shown) and has a small inner diameter d such as about 9.5 mm or 15.2 mm. As shown in FIG. 2, the in-core instrumentation cylinder 12 uses an all-round connection W for fixing to the lower mirror portion 11 a of the reactor pressure vessel 11 and for connecting a tube (cylinder).

  The maintenance laser system 20 is connected to a transport / scanning mechanism 23 via one or a plurality of optical fibers 25 as an optical transmission means, and the transport / scanning mechanism 23 connects a power / signal electric cable group 26. Via the operation panel 22. The maintenance laser system 20 and the flaw detection signal processing system 21 are also connected by a power / signal electric cable group 26.

  The transport / scanning mechanism 23 connected to the maintenance laser system 20 via the optical fiber 25 is a suspended wire or cable suspended from the lifting mechanism 27 of the work carriage 19 that can travel in one or two dimensions. 28 is suspended and supported so as to be movable up and down. The working carriage 19 may be a carriage dedicated to preventive maintenance such as internal flaw detection and material surface stress improvement of the in-core instrument tube 12 or above the reactor pressure vessel (RPV) 11 for fuel replacement. A fuel replacement facility installed in the vehicle may be substituted.

The transmission laser beam L ₁ oscillated from the maintenance laser system 20 is guided to the optical fiber 25 and transmitted from the exit end to the transport / scanning mechanism 23 for the inner surface flaw inspection and preventive maintenance of the tubular structure in the reactor. Used. As a transmission laser light source included in the maintenance laser system 20, for example, a second harmonic (wavelength: 532 mm) of a Q-switch Nd: YAG laser can be used. This laser light source can be used as it is as a light source for laser peening, which also serves as preventive maintenance, simply by adjusting oscillation energy, scanning conditions, and the like. The laser light source can be shared as a flaw detection light source or a preventive maintenance light source by adjusting oscillation energy, scanning conditions, and the like. Specifically, the oscillation energy is set to 30 mj during flaw detection and 60 mj during preventive maintenance.

The transmission laser light L ₁ oscillated in the maintenance laser system 20 is guided to the optical fiber 25 and is optically transmitted to the transport / scanning mechanism 23 from the fiber exit end. The detailed structure of the transport / scanning mechanism 23 is shown in FIG.

  The transport / scanning mechanism 23 has a rectangular (polygonal) long or box-shaped main body casing 30 with at least one side surface opened and a seat base 31 provided at the lower portion of the main body casing 30 as main structures. Mechanism. An insertion tube 32 is installed in the main body casing 30, and the insertion tube 32 is provided so as to be vertically movable and rotationally driven by a vertical motion drive mechanism 33 and a rotational drive mechanism 34.

  A laser irradiation head 35 having a configuration disclosed in Japanese Patent Application Laid-Open No. 2005-40809 (Patent Document 3) is attached to the distal end of the insertion tube 32 as laser irradiation means. One side of the main body casing 30 is opened in a rectangular shape in consideration of maintenance of the vertically installed drive mechanism 33, the rotary drive mechanism 34, the insertion tube 32 that can be moved up and down, and the laser irradiation head 35. It is. The conveyance / scanning mechanism 23 is provided with an in-furnace TV camera or the like and in-furnace observation means. By providing the in-reactor TV camera or the like, it is possible to observe the operation of the in-reactor (internal) in the reactor pressure vessel 11 during actual operation.

  In the transport / scanning mechanism 23 shown in FIG. 3, the insertion tube 32 and the laser irradiation head 35 are sufficiently placed in the in-core instrumentation tube 12 as a tubular structure in the reactor by the downward movement of the vertical movement drive mechanism 33. Indicates the inserted state. When the insertion tube 32 and the laser irradiation head 35 are pulled up to the top, that is, in the initial state, the insertion tube 32 and the laser irradiation head 35 are completely pulled out from the top of the in-core instrumentation tube 12. Kept in a state.

  The insertion tube 32 is rotatably supported by the rotation drive mechanism 34, and the rotation drive mechanism 34 is supported by the vertical movement drive mechanism 33 so that the laser irradiation head 35 can move up and down. The laser irradiation head 35 is supported so as to be freely inserted and withdrawn in an in-core instrument tube 12 as a tubular structure in the reactor. Various types of tubular structures in the reactor can be considered in addition to the in-core instrument tube.

As shown in FIG. 3, the optical fiber 25 that transmits the transmission laser beam L ₁ and the reception laser beam L ₂ used for laser ultrasonic flaw detection is guided to the cable tray 36 from the upper part of the conveyance / scanning mechanism 23. The insertion tube 32 has an inner diameter that is larger than the outer diameter of the optical fiber 25. The optical fiber 25 has an optically appropriate positional relationship so that the optical fiber 25 is optically connected to the laser irradiation head 35 provided at the distal end of the insertion tube 32 via the insertion tube 32. To be fixed.

  Next, the operation of the laser maintenance device will be described.

  The conveyance / scanning mechanism 23 suspended from the work carriage 19 by the suspension wire 28 is moved up and down as shown by the dotted arrow in FIG. 1 by the operation of the elevation mechanism 27 provided on the work carriage 19 and the operation of the suspension wire 28. It is seated on an in-core instrument tube 12 provided at the bottom of the reactor pressure vessel 11 along the path.

  The fact that the conveyance / scanning mechanism 23 is securely seated on the in-core instrument tube 12 is detected by a seating sensor 37 as seating detection means, and is sent to the operation panel 22 via the cable 26 as a seating completion signal. When the seating completion signal is confirmed on the operation panel 22, the support mechanism (operating rod) 39 is pressed against the in-core instrument tube 12 by the operation of the fluid cylinder 38 as a driving and fixing mechanism, and the conveying / scanning mechanism 23 is in the furnace. It is fixed to the instrumentation cylinder 12.

With the conveyance / scanning mechanism 23 fixed to the in-core instrument tube 12, the operation panel 22 transmits the driving force and the driving signal to the vertical movement driving mechanism 33 via the power / signal electric cable group 26 for insertion. The tube 32 and the laser irradiation head 35 at the tip thereof are inserted into the in-core instrumentation cylinder 12. When the laser irradiation head 35 to a predetermined vertical position by the vertical position sensor provided in the vertical movement drive mechanism 33 is installed, it oscillates the transmission laser beam L ₁ and the received laser beam L ₂ from the maintenance laser system 10, the optical fiber 25 and the laser irradiation head 35 irradiate the target part on the inner surface of the in-core instrument tube 12 under appropriate irradiation conditions, and the flaw detection inspection is started.

  When the flaw detection inspection is started, the driving force and the driving signal are transmitted again from the operation panel 22 to the vertical movement driving mechanism 33 and the rotation driving mechanism 34 shown in FIG. 3, and the laser irradiation head 35 is moved at a predetermined position. Spiral scanning, axial scanning, or rotational scanning is performed, and the target portion of the in-core instrument tube 12 is inspected.

  After completion of the flaw detection scanning within a predetermined inspection range on the inner surface of the in-core instrument tube 12, the vertical movement drive mechanism 33 raises the laser irradiation head 35 to the extraction position and moves to the next in-core instrument tube 12. The carrying operation of the transport / scanning mechanism 23 is carried out by an operation (work) procedure almost opposite to the work start.

By operating the conveyance / scanning mechanism 23 under the control of the operation panel 22, a desired nondestructive inspection can be easily realized on the inner surface of the in-core instrument tube 12. Is completed, and as a result of the flaw detection inspection, if no crack is detected on the inner surface of the in-core instrument tube 12, only the irradiation condition of the transmission laser beam L1 is changed, or any one of the above-described components is changed. By simply making changes / additions, it is possible to shift to preventive maintenance work such as laser measurement, modification, and machining stress improvement.

  FIG. 4 shows a first modification of the first embodiment of the laser maintenance apparatus of the present invention.

  The overall configuration of the laser maintenance device 10 is the same as that of the first embodiment except for the maintenance device and the insertion tube. Therefore, the same reference numerals are used for the same components, and illustration and description are omitted.

  The laser maintenance apparatus 10 shown in the first modification uses a resin insertion tube 32a such as polycarbonate. The maintenance device 10 is characterized in that the insertion tube 32a is made of resin.

  As shown in FIG. 4A, the in-core instrument tube 12 as a tubular structure in the reactor is welded and fixed to the lower mirror portion 11a (see FIG. 2) of the reactor pressure vessel 11. As shown in FIG. 4 (B), the in-core instrumentation cylinder 12 has a “<” shape as shown in FIG. 4 (B), or “S” as shown in FIG. 4 (C). There is a possibility that the inner diameter is curved in a letter shape. The bent area BA of the in-core instrument tube 12 has no problem as to the function and strength of the in-core instrument tube 12, but considering that the insertion tube 32 a is inserted into the inner surface of the in-core instrument tube 12. The following problems may occur. That is, when the in-core instrumentation cylinder 12 is in a standard straight tube state (FIG. 4A), the insertion tube 32 can be inserted and extracted even if it is made of metal or the like.

  However, when the insertion tube 32 made of metal or the like is used in a state where the in-core instrument tube 12 is bent, as shown schematically in FIG. 4B, the bent portion of the in-core instrument tube (tube) 12 When the laser irradiation head 35 reaches the vicinity, the insertion tube 32a and the in-furnace instrumentation cylinder 12 interfere with each other, making insertion / extraction difficult. Here, when the insertion tube 32a is made of a resin such as polycarbonate, the bending portion is flexibly accommodated while maintaining the supporting strength, so that even the bending tube can be easily inserted into and extracted from the in-core instrument tube 12. And it becomes possible.

  5 and 6 are explanatory views showing a second modification of the first embodiment of the laser maintenance apparatus of the present invention.

  The laser maintenance device 10 shown in this modification has an overload prevention interlock function, and the overall configuration of the maintenance device is different from the laser maintenance device 10 shown in FIGS. Therefore, the same components are denoted by the same reference numerals, and illustration and description thereof are omitted.

  The laser maintenance apparatus 10 shown in FIGS. 5 and 6 is provided with an interlock function that prevents the insertion tube 32 from being inserted into the in-core instrumentation cylinder 12 due to overload. In other words, the transport / scanning mechanism 23 of the maintenance apparatus 10 is provided with an overload insertion preventing means 49 that prevents the insertion tube 32 and the laser irradiation head 35 from being overloaded.

  On the other hand, the in-core instrument tube 12 as the tubular structure in the reactor may have a curved portion or a bent portion as shown in FIGS. 4 (B) and (C).

  Even if there is a curved portion or a bent portion in the in-core instrument tube 12 that is a tubular structure in the reactor, the insertion tube 32 is made of a resin tube, so that the insertability into the bent portion BA is sufficiently high. It can be secured.

  However, if the bending of the in-core instrumentation cylinder 12 is very large, it becomes difficult to insert the insertion tube 32, and even if the resin insertion tube 32 is adopted, the insertion becomes difficult.

  When it becomes difficult to insert the insertion tube 32 into the in-furnace instrumentation cylinder 12, it is difficult to insert the insertion tube 32 and the laser irradiation head 35 beyond a certain level in a normal handling operation of the insertion tube 32. In spite of the difficulty in inserting more than a predetermined amount, the apparatus side of the vertical movement drive mechanism 33 places an insertion load so that the insertion tube 32 and the laser irradiation head 35 are inserted to a predetermined position. . As a result, there is a concern that the insertion tube 32 and the laser irradiation head 35 may be caught in the in-furnace instrumentation cylinder 12 or ultimately the vertical movement drive mechanism 33 may be damaged.

  In the laser maintenance device 10 of the second modified example, the overload insertion preventing means 49 having an interlock function for preventing overload is provided, so that the insertion tube 32 and the laser irradiation head 35 are bitten into the bent portion, and the top and bottom This prevents damage to the basic / scanning mechanism 23 such as the dynamic drive mechanism 33.

  FIGS. 5 and 6 are enlarged views of part C shown in FIG. 3, and show portions of the vertical drive mechanism 33 and the rotary drive mechanism 34 provided in the transport / scan mechanism 23.

  The rotation drive mechanism 34 includes a rotation drive motor 40, an insertion tube guide mechanism 41, and a rotation drive base 42 as main components. The rotation drive mechanism 34 is configured to hang from the vertical drive mechanism 33 by its own weight. The vertical movement drive mechanism 33 is mainly composed of a lift drive motor 45 and lead screws 46 and 47 as screw shafts shown in FIG.

  By making the rotation drive mechanism 34 have a hanging structure with respect to the vertical movement drive mechanism 33, the rotation drive mechanism 34 can move freely with respect to the vertical movement drive mechanism 33 in a range H in the upward direction from the initial position.

  In the rotation drive mechanism 34, when the lead screw 46 is rotated by the lift drive motor 45, the nut 47 moves up and down, and the rotation drive mechanism 34 as a whole moves up and down following the vertical movement of the nut 46. In a normal case, the laser irradiation head 35 sets the inner hole of the in-core instrument cylinder 12 at an arbitrary vertical position and an arbitrary angle by matching the rotational operation of the rotary drive mechanism 34 with the vertical movement operation. In addition, continuous up / down / rotation driving (including helical movement) can be realized within an arbitrary range.

  When the insertion tube 32 is inserted into the in-core instrument tube 12 (downward) and the laser irradiation head 35 attached to the distal end of the insertion tube 32 becomes difficult to insert for some reason, the nut 47 is set to the set value. As shown by the chain line in FIG. 5, the rotary drive mechanism 34 is not pushed by an overload by a hanging structure (not shown) as shown in FIG. Stop at the hanging position.

  The up / down drive motor 45 of the vertical drive mechanism 33 is provided with a first position detection sensor (not shown) as a first vertical position measuring means for measuring the vertical position of the vertical drive mechanism 33, and is rotationally driven. The rotation drive base 42 of the mechanism 34 is provided with a second position detection sensor 48 as a second vertical position measuring means for measuring the vertical position of the rotation drive mechanism 34. The second position detection sensor 48 rotates the second position detection sensor 48. The actual raising / lowering (vertical movement) position of the drive mechanism 34 is measured and detected.

  The output values of the first and second position detection sensors 48 are constantly monitored on the operation panel 22 (see FIG. 1), and the output values of the first position detection sensor and the second position detection sensor 48 are output. If the difference between the values exceeds the set value H, the overload insertion preventing means 49 has an interlock function that detects that further insertion of the insertion tube 32 is impossible and stops its vertical drive. A position detection sensor 48 is provided in the vertical movement drive mechanism 33 and the rotation drive mechanism 34 so that the vertical position or relative position of the vertical movement drive mechanism 33 and the rotation drive mechanism 34 is constantly monitored, whereby the insertion tube 32 and the laser irradiation head 35 are monitored. The in-furnace instrumentation cylinder 12 can be prevented from being caught in the bent portion BA and the conveyance / drive mechanism 23 can be prevented from being damaged.

  The overload insertion preventing means 49 may be configured by a mechanism that installs a torque measurement function in the lifting drive motor 45 and prevents insertion due to overload by torque monitoring.

[Second Embodiment]
FIG. 7 is an overall configuration diagram showing a second embodiment of the laser maintenance apparatus of the present invention.

Laser protection device 10A shown in this embodiment, characterized in that to improve the handling properties to an optical fiber 25 of one or a plurality of transmitting transmits the laser beam L ₁ and the received laser beam L ₂ The same components as those of the laser maintenance apparatus 10 shown in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the laser maintenance apparatus 10A shown in FIG. 7, only from an optical point of view, the optical fiber 25 includes an insertion tube 32 and a laser irradiation head 35 (see FIG. 3) from the incident end connected to the maintenance laser system 20. It is desirable to use a single optical fiber that is seamless to the output end in the vicinity. When the optical fiber 25 has a seam, a part of the laser light energy is reflected and scattered at the seam part, the laser light energy that can be effectively transmitted is reduced, and the laser light component reflected and scattered at the seam is light. This is because it may cause damage to the fiber or other optical elements.

  However, since the in-core instrumentation cylinder 12 is located about 20 m below the level of the operation floor 18, the total length of the optical fiber 25 is at least 20 m or more, and there is a concern that there is a problem in handling.

In the laser maintenance device 10A for the tubular structure in the reactor shown in FIG. 7, a waterproof optical fiber connector 50 is introduced into the optical fiber 25 connecting the maintenance laser system 20 and the transport / scanning mechanism 23 for maintenance. The optical fiber 25a having a length la on the laser system 20 side and the optical fiber 25b having a length lb on the laser irradiation head 35 (see FIG. 3) side can be divided. The handleability of the optical fiber 25 is improved by adopting a structure in which the optical fiber 25 that transmits the transmission laser beam L ₁ and the reception laser beam L ₂ can be divided.

The ratio of the lengths of the optical fibers 25a and 25b constituting the optical fiber 25 is arbitrary, but considering the handleability of the transport / scanning mechanism 23, the fiber length la of the optical fiber 25a and the fiber length lb of the optical fiber 25b are When la> lb and la + lb ≧ 20 m, the optical fiber 25a can adjust the delivery length of the optical fiber by the optical fiber reel 51.

When the optical fiber 25 is connected by the waterproof optical fiber connector 50, reflection / scattering of the laser light at the connector portion occurs. In order to solve this reflection / scattering problem, an antireflection function is provided by providing antireflection means on the connection surfaces of the optical fiber 25a and the optical fiber 25b. As the antireflection means, a method of installing an optical antireflection film tuned in accordance with the respective laser wavelengths of the transmission laser light L ₁ and the reception laser light L ₂ is desirable and optimal.

  As an antireflection measure for the optical fiber 25, more simply, the antireflection means is such that the connector element on the optical fiber 25b side is sealed with the optical fiber protective tube (waterproof against the external water environment), and the optical fiber 25a side. The connector element may be non-sealed with respect to the optical fiber protective tube (waterproof to the external water environment), and water may be injected into the seam.

  Furthermore, the sealed connector element on the optical fiber 25b side and the non-sealed connector element on the optical fiber 25a side may be simply connected in water. The effect | action which prevents the reflection and scattering of the laser beam in a connector part by inject | pouring water into a joint is demonstrated using FIG.

となる。The reflection of the laser beam (the transmission laser beam L ₁ and / or the reception laser beam L ₂ ) occurs when there is a difference in the refractive index between the two media through which the laser beam propagates. Is known to grow. If the material of the fiber cores of the optical fibers 25a and 25b is quartz glass, the refractive index is about 1.46, and when the ambient atmosphere is air (refractive index 1.00), the reflection of normal incident light is performed. The rate R is

It becomes.

  On the other hand, if the periphery of the joint between the optical fibers 25a and 25b is replaced with a water atmosphere, the refractive index of water is 1.33, so the reflectance is about 0.2% from the same calculation, and is reflected at the end face of the fiber. The light component can be 1/10 or less. When connecting the optical fibers 25a and 25b in water, an underwater connection jig 55 as shown in FIGS. 9 and 10 is used.

  FIG. 9 is a side view of the underwater connection jig 55, and FIG. 10 is a plan view (top view) of the underwater connection jig 55. The underwater connection jig 55 holds the fixed bases 57a and 57b for fixing the optical fiber protection tubes 56a and 56b into which the optical fibers 25a or 25b are inserted, respectively, and the center axis of the fixed bases 57a and 57b while maintaining the arrow C in the figure. It comprises a slide guide 58 that slides in a direction and a water tank 59 that holds them in an underwater environment, and enables two optical fibers 25a and 25b to be efficiently connected in water. .

Optical fiber 25a, the inside 25b compares the transmission laser light L ₁ to be transmitted and received laser light L _2, a high laser energy transmitted laser beam L _1. Considering only the laser ultrasonic flaw detection even with a relatively low transmission laser light L ₁ energy is sufficient.

  Since the laser maintenance apparatus 10A according to the present embodiment is premised on an apparatus that can be shared with preventive maintenance laser technology in addition to flaw detection, it is necessary that the apparatus specifications be usable even at high laser energy. According to [Non-Patent Document 2], for example, it is preferable to use an optical fiber having a core diameter of 1.5 mm or more in order to transmit laser light for laser peening.

  Also in the second embodiment, the core diameter d1 of the optical fiber 25 is set to φ1.5 mm or more from the viewpoint of device sharing in nondestructive inspection and preventive maintenance. The connector-side core diameter d2 of the optical fiber 25b connected to the optical fiber 25a is preferably in terms of transmission efficiency, where the connector-side core diameter of the optical fiber 25 is d1, and the core diameter d2 ≧ core diameter d1. Further, either one of the optical fibers 25a and 25b can be a tapered optical fiber 25b in which the core diameter is smoothly reduced from the entrance side to the exit side.

  Further, since the optical fiber 25a or 25b may be broken even when it is bent relatively larger than an electric cable or the like, the optical fiber 25a or 25b is inserted into the optical fiber protective tubes 56a and 56b for use. Although the optical fiber protection tubes 56a and 56b guarantee the minimum bending radius, in addition to this, the cable tray 13 is mechanically bent only at the minimum bending radius or more so that the optical fiber 25 can be handled more easily. can do.

  12 and 13 are explanatory views showing a modification of the laser maintenance apparatus according to the second embodiment of the present invention.

  The laser maintenance device 10A shown in this modification is driven in a vertical motion when laser ultrasonic nondestructive inspection is performed on the inner surface of an in-reactor instrumentation cylinder 12 which is a tubular structure in the reactor provided in the reactor pressure vessel 11. This laser maintenance device aims to obtain a highly reliable test result by appropriately setting the operation range of the mechanism 33 and the rotation drive mechanism 34 (see FIGS. 2 and 5).

Defect detection in laser ultrasonic nondestructive inspection uses surface waves spreading concentrically with the irradiation position as a sound source when the transmission laser light L ₁ is irradiated, and the surface waves are reflected by surface opening defects. It carried out by detecting the reflected signal at the receiving laser beam L _2.

  Experimental data shown in FIG. 12 in a test piece simulating an in-core instrument cylinder 12 (see FIG. 7) having an inner diameter set in water in the reactor pressure vessel (or reactor vessel) 11 of, for example, 9.5 mm. According to the above, it has been found that a range of a radius of about 5 mm from the irradiation position of the received laser beam is an area where the reflected signal can be detected with a high SN ratio.

On the other hand, from the viewpoint of reliable detection of the inner surface defects of the in-core instrument tube 12, it is desirable to inspect the same position by overlapping it a plurality of times (minimum two times). Consider the case where the irradiation position of the received laser beam L ₂ is scanned in the inner surface of the in-core instrument tube 12 two-dimensionally in the circumferential direction and the axial direction (spirally).

FIG. 12 is an inner surface development view (that is, an inspection surface) of the in-core instrument tube 12. Reference numerals 1 to 12 given within the circles indicate irradiation positions of the received laser light L ₂ in a certain range, and dotted lines indicate reflected signals. This represents an area that can be detected with a high S / N ratio (that is, a circle with a radius of 5 mm centered on the irradiation position). If the circumferential and axial scanning pitch of the received laser beam L ₂ and 5mm or less, relates to any point on the test surface, it can be seen that at least 2 times or more inspection data can be collected.

また、１周の周回後の軸方向の移動量が５ｍｍ以下であれば良いことから、軸方向の走査速度ｖ_Ａは

となる。走査速度のｖ_Ｒ、ｖ_Ａの範囲内で、かつ、データ採取のオーバラップ率、検査の所要時間、走査機構の動作限界等を加味して走査速度を設定することにより、同じ位置のデータ採取を複数回実施可能な、信頼性の高い検査結果を得ることができる。Now, assuming that the inner diameter ID of the in-core instrument tube 12 is the length of one round πpID, the inspection data collection interval is f (Hz), and the circumferential scanning speed v _R is

Further, since the amount of movement in the axial direction after one round of rotation only needs to be 5 mm or less, the scanning speed v _A in the axial direction is

It becomes. Data collection at the same position is possible by setting the scanning speed within the range of the scanning speed v _R and v _A and taking into consideration the overlap rate of data collection, the time required for inspection, the operation limit of the scanning mechanism, etc. Can be performed a plurality of times, and a highly reliable test result can be obtained.

[Third Embodiment]
FIG. 14 is an overall configuration diagram showing a third embodiment of the laser maintenance apparatus of the present invention.

  The laser maintenance device 10B for a tubular structure in a nuclear reactor shown in this embodiment aims to improve the reliability of data collection when the inner surface of an in-core instrument tube 12 is subjected to laser ultrasonic nondestructive inspection. It is a laser maintenance apparatus, the same code | symbol is attached | subjected to the same structure as the maintenance apparatus 10 shown by 1st Embodiment, and description is abbreviate | omitted.

Laser protection device 10B shown in Figure 14, the laser transmits the laser beam L ₁ and the received laser beam L ₂ required for ultrasonic flaw detection is transmitted by the optical fiber 25, in the end, the laser of the insertion tube 32 The underwater atmosphere propagates from the ultrasonic irradiation head 35 and is irradiated on the inner surface of the in-furnace instrumentation cylinder 12. The reactor water 16 is clean pure water, but in the worst case, if any inclusions are floating in the optical path, either the transmission laser beam L ₁ or the reception laser beam L ₂ or both are the worst. May be reflected and scattered by the suspended matter before being irradiated on the inner surface of the in-core instrument tube 12, and the inspection data may not be collected.

  The maintenance device 10B according to the third embodiment includes a circulation cleaning device 65 that forcibly circulates reactor water as clean water supply means. The circulation cleaning device 65 is connected to a first water tube 66 that pumps up the reactor water 16, a pump system 67 with a filter that removes inclusions and jets to the pump outlet side, and an outlet of the pump system 67 with a filter. The second water tube 68 is connected to the insertion tube 32 of the transport / scanning mechanism 23 via a cable tray. The clean water ejected from the second water tube 68 passes through the gap between the insertion tube 32 and the optical fiber 25 and is finally ejected from the laser irradiation port of the laser ultrasonic irradiation head 35.

By providing the circulating cleaning device 65 of the reactor water, which water in the optical path of water atmosphere transmission laser beam L ₁ and the received laser beam L ₂ is replaced with clean water, to ensure the integrity of the optical path of the laser beam It is.

  This laser maintenance device 10B can collect inspection data as usual even in the case where a floating substance exists in the water atmosphere on the inner surface of the in-core instrument tube 12. In this embodiment, it is assumed that the reactor water 16 is used as clean water, but it is of course possible to supply clean water from a separately prepared clean water tank or the like. In this case, it is necessary to pay attention to the rise of the reactor water level.

  FIG. 15 shows a modification of the third embodiment of the laser maintenance apparatus of the present invention.

  The laser maintenance device 10B shown in this modification is a laser maintenance device with high mechanical reliability that does not cause dropping of in-furnace insert parts.

  Inserted into the inner surface of the in-core instrument tube 12 are the insertion tube 32 and the laser ultrasonic wave irradiation head 35 shown in FIG.

  This laser maintenance device 10B also serves as a laser non-destructive inspection device for the in-core instrument tube 12, and most of the device also serves as a flaw detection device and a preventive maintenance device using a laser. When the maintenance apparatus 10B considers the combined use with other laser preventive maintenance technologies, the insertion tube 32 can be easily shared, but the laser ultrasonic irradiation head 35 has a replaceable structure due to a difference in irradiation conditions. It is desirable to be.

  In order to make the laser ultrasonic wave irradiation head 35 easily and easily attachable to and detachable from the insertion tube 32, the insertion tube 32 and the laser ultrasonic wave irradiation head 35 are screwed together. In this case, there is a concern that the screw is loosened by the revolving operation on the inner surface of the in-core instrumentation cylinder 12 and the laser ultrasonic wave irradiation head 35 falls into the in-core instrumentation cylinder 12.

In the modified example of the laser maintenance apparatus 10B shown in FIG. 15, the rotation direction D of the laser ultrasonic irradiation head 35 in the in-core instrument tube 12 is fixed and operated in one direction, and the insertion tube 32 and the laser ultrasonic irradiation are performed. The direction in which the head 35 is screwed is made to coincide with the tightening direction E by the turning operation . In this way, it is possible to easily replace the laser ultrasonic irradiation head 35 according to the application, and to realize the transport / scanning mechanism 23 of the maintenance device 10B that does not cause the irradiation head 35 to drop off. Become.

[Fourth Embodiment]
FIG. 16 is an overall configuration diagram showing a fourth embodiment of the laser maintenance apparatus of the present invention.

  The tubular structure maintenance device 10C shown in this embodiment is a laser maintenance device for more efficiently realizing laser ultrasonic nondestructive inspection and laser preventive maintenance of the inner surface of the in-core instrument tube 12. is there. The same components as those in the maintenance device 10 (10A, 10B) shown in the first to third embodiments are denoted by the same reference numerals, and the description thereof is omitted.

  The operation of the laser maintenance apparatus 10C shown in FIG. 16 is the same as that described in the laser maintenance apparatus 10 (10A, 10B) of the first to third embodiments.

In the laser maintenance apparatus 10C shown in the fourth embodiment, as shown in FIG. 16, the flaw detection signal processing system 21 has one feature. A maintenance device 10C for a tubular structure in a nuclear reactor includes a flaw detection signal processing system 21A including a plurality of systems, a plurality of transport / scan mechanisms 23A and 23B, and an operation panel for operating and monitoring each of the transport / scan mechanisms 23A and 23B. and an operation panel 22A and a plurality of systems including, oscillated transmission laser beam L ₁ and the received laser beam L ₂ optically is branched, and can output maintenance laser system 20A to output light of a plurality of systems, maintenance laser system 20A One or a plurality of optical fibers 25A, 25B for transmitting the output light from the carriage / scanning mechanisms 23A and 23B, respectively, and a wire (cable) 28A for suspending and supporting the carriage / scanning mechanisms 23A and 23B from the work carriage 19 And 28B.

  If the laser maintenance device 10C is configured as shown in FIG. 16, it is possible to carry out operations by a plurality of devices in the furnace in parallel using one maintenance laser system 20A and one work carriage 19. It becomes. In this maintenance device 10C, it is possible to use all of the plural systems of transport / scanning mechanisms 23A, 23B for laser ultrasonic nondestructive inspection. However, the maintenance device 10C for the tubular structure in the reactor is equipped with laser flaw detection technology and laser maintenance technology. Can be shared, and a part can be used for laser ultrasonic nondestructive inspection, and the whole or a part of the remaining maintenance device 10C can be used for laser preventive maintenance.

[Fifth Embodiment]
FIG. 17 is an overall configuration diagram showing a fifth embodiment of the laser maintenance apparatus of the present invention.

  The laser maintenance apparatus 10D shown in this embodiment is a laser maintenance apparatus for more efficiently realizing laser ultrasonic nondestructive inspection and laser preventive maintenance on the inner surface of the in-core instrument tube 12. The same components as those of the maintenance device 10C shown in the fourth embodiment are denoted by the same reference numerals and description thereof is omitted.

  A laser maintenance device 10D shown in FIG. 17 includes in-reactor TV cameras 70A and 70B as observation means for observing the operation status of the laser maintenance device 10D provided in the reactor pressure vessel 11, and each reactor In-furnace status around the in-core instrument tube 12 by the internal TV cameras 70A and 70B, the seating status of the laser maintenance device 10D on the in-core instrument tube 12, and the vertical movement installed in the laser maintenance device 10D It is possible to confirm the operation status of the drive mechanism 33, the rotation drive mechanism 34, the insertion tube 32, and the laser irradiation head 35 (see FIG. 3).

  In the laser maintenance apparatus 10D of the fifth embodiment, the in-furnace TV cameras 70A and 70B are provided as observation means, and the output images from the in-furnace TV cameras 70A and 70B are guided to the operation panel 22A by the image cables 71A and 71B. If the display means (not shown) installed in the vicinity of the panel 22A can be observed, even if any trouble occurs around the transport / scanning mechanisms 23A, 23B of the maintenance device 10D and the maintenance device 10D, the trouble can be detected quickly. Laser ultrasonic nondestructive inspection and laser preventive maintenance of the inner surface of the in-core instrument tube 12 can be realized more efficiently.

1 is an overall configuration diagram showing a first embodiment of a laser maintenance apparatus of the present invention. The expanded sectional view of the A section of FIG. Explanatory drawing of the conveyance and scanning mechanism with which the maintenance apparatus of the tubular structure in a reactor of this invention is equipped. (A), (B) and (C) are operation | movement explanatory drawings which show the 1st modification of 1st Embodiment which expanded the B section of FIG. The figure which shows the C section of FIG. 3 on an enlarged scale, and shows the conveyance and scanning mechanism of the 2nd modification of 1st Embodiment of a maintenance apparatus. FIG. 6 is an enlarged view of part C of FIG. 3, similar to FIG. 5, illustrating the interlock function for preventing overload of the maintenance device. The whole block diagram which shows 2nd Embodiment of the laser maintenance apparatus of this invention. (A) And (B) is operation | movement explanatory drawing of the antireflection function which shows the reflective characteristic of the optical fiber with which the maintenance apparatus of the tubular structure in a reactor of this invention is equipped. The side view which shows the structural example of the underwater connection jig | tool of the laser maintenance apparatus of this invention. The top view of the underwater connection apparatus shown by FIG. Explanatory drawing of the optical fiber of the laser maintenance apparatus of this invention. Explanatory drawing of the range of the laser ultrasonic inspection which shows the modification of 2nd Embodiment of the laser maintenance apparatus of this invention. Explanatory drawing of the range of the laser ultrasonic inspection which shows the modification of 2nd Embodiment of the laser maintenance apparatus of this invention. The whole block diagram which shows 3rd Embodiment of the laser maintenance apparatus of this invention. The conceptual diagram which shows the modification of 3rd Embodiment of the laser maintenance apparatus of this invention, and shows the example of attachment of a laser irradiation head. The whole block diagram which shows 4th Embodiment of the laser maintenance apparatus of this invention. The whole block diagram which shows 5th Embodiment of the laser maintenance apparatus of this invention. The whole block diagram of the nondestructive inspection apparatus of the conventional in-core instrument tube. The perspective view which shows the whole structure of the nondestructive inspection apparatus shown by FIG. The figure which shows an example of a structure of the irradiation head for laser ultrasonic inspection of a tubular structure.

Explanation of symbols

10, 10A, 10B, 10C, 10D Laser maintenance equipment 11 Reactor pressure vessel 12 In-core instrumentation tube (in-reactor tubular structure)
14 Reactor building 15 Reactor well 16 Reactor water 18 Operation floor 19 Work cart 20, 20A Maintenance laser system 21, 21A Inspection signal processing system 22, 22A Operation panel 23, 23A, 23B Conveying / scanning mechanism 25 Optical fiber ( Optical transmission means)
26 Power / Signal Electric Cable Group 27 Elevating Mechanism 28 Hanging Wire 30 Main Body Casing 31 Seat Base 32 Insertion Pipe 33 Vertical Movement Drive Mechanism 34 Rotation Drive Mechanism 35 Laser Irradiation Head (Laser Irradiation Means)
36 Cable tray 37 Seating sensor (sitting detection means)
38 Fluid cylinder (drive fixing mechanism)
40 Rotation Drive Motor 41 Insertion Pipe Guide Mechanism 42 Rotation Drive Base 45 Elevation Drive Motor 46 Lead Screw 47 Nut 48 Second Position Detection Sensor (Second Vertical Position Measurement Means)
49 Overload insertion preventing means 50 Waterproof optical fiber connector 51 Optical fiber reel 55 Underwater connection jigs 56a and 56b Optical fiber protection tubes 57a and 57b Fixed base 58 Slide guide 59 Water tank 65 Recirculation cleaning device for reactor water 66 Water tube 67 Pump system with filter 68 Second water tube 70A, 70B In-furnace TV camera (observation means)
71A, 71B Image cable

Claims (14)

A laser system that is composed of a laser light source and an optical system and that oscillates laser light, and that can change the irradiation condition of the laser light to an irradiation condition that enables flaw detection and preventive maintenance ;
Optical transmission means for transmitting laser light oscillated from the laser system;
Laser irradiation means for irradiating the target site with the laser light transmitted by the light transmission means ;
A transport / scanning mechanism for transporting the optical transmission means and the laser irradiation means to a target part, and scanning in an arbitrary range of the target part;
An operation panel for controlling and monitoring the scanning operation of the transport / scanning mechanism;
A working carriage for positioning the transporting / scanning mechanism in a one-dimensional or two-dimensional manner with respect to the object from above the furnace vessel;
The conveyance / scanning mechanism includes a polygonal main body casing having at least one side opened,
A seating base for seating on the conveyance / scanning mechanism;
A guide mechanism for guiding the optical transmission means and a cable for transmitting a power / control signal for scanning operation;
In the main body casing, an insertion tube for inserting the laser irradiation means installed at the tip thereof into a target site,
A vertical drive mechanism and a rotary drive mechanism for moving the laser irradiation means up and down and rotating through the insertion tube;
A seating detecting means for detecting that the seating base of the transport / scanning mechanism is seated on an object;
A laser maintenance apparatus comprising: a driving and fixing mechanism that fixes a conveyance / scanning mechanism to a target after sitting . 2. The laser maintenance apparatus according to claim 1, wherein the insertion tube provided in the transport / scanning mechanism is made of a resin having a hollow structure. The transport / scanning mechanism comprises overload insertion preventing means for preventing overload insertion of an insertion tube inserted into a target site ,
The overload insertion preventing means is installed in the vertical movement drive mechanism in a state where the rotation drive mechanism is movable in an arbitrary range,
The first vertical position measuring means for measuring the vertical position of the vertical drive mechanism, the second vertical position measuring means for measuring the vertical position of the rotary drive mechanism, and the difference between the output values from both vertical position measuring means A position deviation detecting means for detecting the error and an interlock function for detecting an insertion operation abnormality when the output signal of the position deviation detecting means exceeds a specific range and preventing overload insertion. The laser maintenance device according to claim 1 . The overload insertion preventing means is installed in the vertical movement drive mechanism in a state where the rotation drive mechanism is movable in an arbitrary range,
A torque measuring means for monitoring the torque in the vertical movement drive mechanism;
4. The laser maintenance apparatus according to claim 3, further comprising an interlock function for preventing overload insertion by torque monitoring by the torque measuring means. A laser system that is composed of a laser light source and an optical system and that oscillates laser light, and that can change the irradiation condition of the laser light to an irradiation condition that enables flaw detection and preventive maintenance;
Optical transmission means for transmitting laser light oscillated from the laser system;
Laser irradiation means for irradiating the target site with the laser light transmitted by the light transmission means;
A transport / scanning mechanism for transporting the optical transmission means and the laser irradiation means to a target part, and scanning in an arbitrary range of the target part;
An operation panel for controlling and monitoring the scanning operation of the transport / scanning mechanism;
A working carriage for positioning the transporting / scanning mechanism in a one-dimensional or two-dimensional manner with respect to the object from above the furnace vessel;
The optical transmission means is composed of one or a plurality of optical fibers for transmitting laser light and an optical fiber protective tube for mechanically protecting the optical fibers,
An optical fiber reel that adjusts the delivery length of the optical fiber while ensuring a minimum bending radius of the optical fiber and the optical fiber protective tube, and from the laser system to the upper part of the transport / scanning mechanism via the optical fiber reel A first optical fiber for transmitting laser light for laser ultrasonic flaw detection transmission / reception; a second optical fiber for transmitting laser light from above the transport / scanning mechanism to the laser irradiation means through the guide mechanism; The first and second optical fibers have a waterproof optical fiber connector for optically connecting the optical fibers to each other at the connection ends of the first and second optical fibers while preventing penetration of the reactor water. A laser maintenance device characterized in that an antireflection means for laser light is applied to a connecting portion between them . By encapsulating laser light reflection preventing means in the connection portion between the first and second optical fibers, and enclosing a liquid having a refractive index greater than 1.0 in the connection portion between the first and second optical fibers. 6. The laser maintenance apparatus according to claim 5, wherein the apparatus is configured. A first optical fiber protective tube and a second optical fiber protective tube are respectively fixed in order to enclose a liquid having a refractive index greater than 1.0 in a connection portion between the first and second optical fibers. The first and second fixed bases, a slide guide that is slidable in the connecting direction while holding the central axes of the first and second fixed bases, and a connecting portion between the first and second optical fibers are underwater. 7. The laser maintenance device according to claim 6, further comprising an optical fiber underwater connection device comprising a water tank held in the environment. 6. The laser maintenance apparatus according to claim 5 , wherein at least one of the first and second optical fibers has an optical fiber core diameter of 1.5 mm or more. The first optical fiber has an optical fiber core diameter of 1.5 mm or more, and the second optical fiber has an optical fiber core diameter on the connection side with the first optical fiber. 9. The laser maintenance device according to claim 8 , wherein the laser maintenance device has a taper structure larger than the aperture and smaller than the core aperture of the first optical fiber on the laser irradiation means side. The rotational operation speed vR by the rotational drive mechanism and the vertical operation speed vA by the vertical drive mechanism are the inner diameter ID and the data collection interval f of the target part.

The laser maintenance device according to claim 1 , wherein the laser maintenance device is within a range determined by: The laser beam incident on the optical transmission means is branched into a plurality of systems, and the working carriage has a carriage function capable of handling a plurality of systems of conveying and scanning mechanisms,
By providing a plurality of systems of a flaw detection signal processing system, one or a plurality of optical transmission means, a laser irradiation means, a conveyance / scanning mechanism, and an operation panel, inspection and measurement of a target part by a plurality of lasers, 2. The laser maintenance apparatus according to claim 1 , wherein the modification, processing, and combination thereof can be performed in parallel. It further comprises clean water supply means for supplying clean water that does not contain optical reflection / scattering substances, and clean water guide means for guiding clean water ejected from the clean water supply means to the laser irradiation means. The laser maintenance apparatus according to any one of claims 1 to 11 . The clean water supply means includes a first water tube for pumping up reactor water, pump means for pumping up reactor water with the first water tube and ejecting it to the outlet side, and a reactor pumped up by the pump means 13. The laser maintenance apparatus according to claim 12 , comprising a filter means for filtering water. 14. The laser according to claim 1, wherein one or a plurality of observation means such as a TV camera is provided in order to confirm an operation state of the maintenance apparatus or a state in the nuclear reactor. Maintenance equipment.

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