JP4754618B2 - Refueling machine - Google Patents

Description

  The present invention relates to a fuel changer for use in fuel loading, exchange and fuel inspection in a nuclear reactor.

  In particular, the present invention relates to a fuel changer in which a fiberscope can be arbitrarily entered inside the fuel assembly while the fuel assembly is held, whereby the state inside the fuel assembly can be visually confirmed. .

  In boiling water nuclear power plants, a reactor pressure vessel containing a reactor core is arranged in the approximate center of the reactor building, and a reactor containment vessel surrounds the reactor vessel.

  In the upper part of the reactor building, a spent fuel pool used for replacement of the fuel assembly is provided, and communicates with the reactor well in the upper part of the reactor containment vessel via the gate for transporting the fuel assembly.

  At the time of fuel replacement, the top head of the reactor containment vessel is opened, and further, the top head of the reactor pressure vessel is opened, and the fuel assembly is replaced by the fuel exchanger.

  FIG. 6 shows a side view of the fuel changer, and FIG. 7 shows a perspective view of the fuel changer.

  The refueling machine 1 has a carriage 2 that travels in the left-right direction in FIG. 6 across the spent fuel pool and the reactor well 3 at the top of the core.

  Furthermore, the fuel changer 1 has a traversing device 4 and can travel in a direction perpendicular to the paper surface of FIG.

  The refueling machine 1 has a main hoist 5, the main hoist 5 has a mast 6, the main hoist 5 can expand and contract the mast 6, and the lower end of the mast 6 can be inserted into the reactor well 3 or the spent fuel pool. .

  A fuel assembly gripping part for gripping the handle of the fuel assembly is provided at the lower end of the mast 5 of the main hoist 5, and the main hoist 5 lowers the lower end of the mast 5 to the fuel assembly. The fuel assembly can be pulled up by grasping a handle projecting from the upper end of the fuel assembly.

  In the boiling water nuclear power plant, the fuel exchanger 1 replaces a part of the fuel assembly and rearranges the fuel assembly during periodic inspection.

  During regular inspections of boiling water nuclear power plants, the reactor containment vessel and the reactor pressure vessel are opened, the reactor well is filled with water, the fuel assembly transport gate is opened, and the spent fuel pool is distributed with water. Then, the fuel assembly is gripped by the fuel exchanger 1, and the fuel assembly is moved from the core to the spent fuel pool or from the spent fuel pool to the core.

  When the fuel exchanger 1 lowers the lower end portion of the mast 5 to the fuel assembly and grips the handle of the fuel assembly by the fuel assembly gripping portion, the operator who has boarded the fuel exchanger 1 uses the binoculars to The gripping state of the fuel assembly was visually confirmed through deep pool water stretched in the pool or reactor well 3.

  Further, after the fuel assemblies have been rearranged, the operator has checked with binoculars to check whether the fuel has been correctly seated at a predetermined position.

  However, since the above visual confirmation is performed from a high place through deep pool water, it has been performed by a skilled operator. However, there is a possibility of lack of certainty and there is a risk of driving without being seated correctly.

  Furthermore, in order to confirm whether or not the fuel has been correctly repositioned, after all the fuel relocation work has been completed, the dedicated camera is gripped by the fuel changer, and all the fuel is photographed from directly above and operated. An operator confirmed the identification number of the fuel assembly stamped on the upper part of the fuel assembly by video. This confirmation of placement in the furnace is performed after the end of work because it is difficult to grasp the identification number during the fuel relocation, but it takes a lot of time to confirm the number. For this reason, it was a heavy burden on the inspector.

  In contrast, a fuel assembly gripping portion is provided at the lower end of the mast, and a fiberscope having a photographing portion at the lower end is passed through the main hoist 5 and the mast 6 to display an image from the photographing portion of the fiberscope. There has been a proposal to provide a display device on the refueling machine 1 (Japanese Patent Laid-Open No. 9-145889).

According to this technology, the imaging unit of the fiberscope is provided at the lower end of the mast 6, and the lower end of the mast 6 is brought close to the target fuel assembly by operating the fuel exchanger 1, the main hoist 5, and the mast 6. Therefore, the gripping state of the handle by the fuel assembly gripping portion and the confirmation of the fuel assembly identification number can be performed in a short time and surely at the same time as the fuel replacement operation.
JP-A-9-145889

  However, during the periodic inspection of the boiling water nuclear power plant, the integrity of the fuel assembly is also inspected as necessary.

  In order to inspect the integrity of the fuel assembly, it is necessary to inspect not only the outside of the channel box but also the state of the fuel rod, for example, corrosion and deformation of the fuel rod cladding tube.

  In the technique disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 9-145889, the gripping state of the handle, the identification number of the fuel assembly and the like can be confirmed more easily, and further the state of the upper portion of the fuel assembly can be confirmed.

  However, the only way to check the integrity of the fuel assembly was to move the fuel assembly to a dedicated inspection stand and check the inside of the fuel assembly manually by an inspector using an inspection fiberscope. . Further, if necessary, the channel box may be removed by a fuel channel attaching / detaching machine.

  As described above, in order to check the integrity of the fuel assembly, particularly to confirm the inside of the fuel assembly, it takes a lot of time and labor to move the fuel assembly to a dedicated inspection stand. There was also a possibility to do.

  When inspecting the inside of a fuel assembly on a dedicated inspection stand, conventionally, an inspection fiberscope has been inserted into the small opening of the upper tie plate of the fuel assembly from a high position by an inspector. Therefore, the inspection fiberscope was swung, and the inspection fiberscope could not be inserted in the vicinity of the fuel rod at the desired location.

  The problem to be solved by the present invention is that it is possible to save labor and time for transporting the fuel assembly to the inspection stand for the health inspection of the fuel assembly, and to eliminate the possibility of the inspector's exposure. An object of the present invention is to provide a fuel exchanger having a function of easily inserting an inspection fiberscope in the vicinity of a fuel rod to be tested.

The fuel changer of the present invention is
In a fuel exchanger having a main hoist, having a fuel assembly gripping part that grips the handle of the fuel assembly at the lower end of the mast by vertically expanding and contracting the mast by the main hoist,
A fiberscope having a photographing part at the lower end passed through the main hoist and the mast;
A fiberscope drawing means capable of feeding or winding the fiberscope;
Guide means provided at the lower end of the mast for guiding the lower end of the fiberscope to a predetermined position;
Display means for displaying video from the imaging section of the fiberscope;
Control means for controlling the operation of the fiberscope drawing means and the guide means;
It is characterized by having.

  The guide means may include a holding portion that gently holds a lower end portion of the fiberscope, and a drive mechanism that drives the holding portion to a predetermined position in a horizontal plane and in a vertical direction.

The drive mechanism of the guide means includes a vertical base rail fixed perpendicularly to the lower end of the mast, a vertical slide rail that slides along the vertical base rail, and a slide along the vertical slide rail. A moving vertical platform,
A horizontal first horizontal base rail fixed to the vertical carriage, a first horizontal slide rail sliding along the first horizontal base rail, and along the first horizontal slide rail A sliding first horizontal platform,
A second horizontal base rail in a horizontal direction fixed so as to be orthogonal to the first horizontal base rail, a second horizontal slide rail sliding along the second horizontal base rail, and the second A second horizontal carriage that slides along a horizontal sliding rail and supports the holding portion;
It can be made to have.

  It is preferable that the fiberscope is configured to have a shape capable of entering the inside of the fuel assembly from the gap of the upper tie plate of the fuel assembly assembly by the fiberscope drawing means.

The fiberscope has a first fiberscope having a vertical downward shooting type shooting unit, and a second fiberscope having a side shooting type shooting unit,
The display means is configured to display the first fiberscope and the second fiberscope in a switchable manner,
The control means, after the fuel assembly gripping part grips a handle of a predetermined fuel assembly, brings the imaging parts of the first fiberscope and the second fiberscope closer to the upper tie plate of the fuel assembly, and The first fiberscope and the second fiberscope can be controlled so that the second fiberscope enters the fuel assembly while displaying the image of one fiberscope on the display means. be able to.

  The fiberscope may include a plurality of fiberscopes, and the control means may be configured to independently control the drawing of each fiberscope.

  An illumination fiberscope having an illumination part at the lower end can be further provided.

  The fuel changer according to the present invention includes a fiberscope having a photographing unit at a lower end portion, a guide means for guiding the lower end portion of the fiberscope to a predetermined position, and a fiberscope capable of feeding or winding the fiberscope. By providing a drawing means, and having a display means and a control means for controlling the guide means and the fiberscope drawing means, the state of the fuel in the water is clarified by bringing the lower end of the mast closer to the core at normal times. Can be confirmed.

  Also, when it is necessary to inspect the inside of the fuel assembly to confirm the soundness of the fuel, the fuel assembly handle is gripped by the fuel assembly gripping section, and the fuel scope imaging section The fiberscope can be allowed to enter the fuel assembly as it is by visually confirming the opening that enters the inside.

  In this case, since the fuel assembly handle is gripped by the fuel assembly gripping portion, the lower end portion of the mast is fixed and the lower end portion of the fiberscope is fixed by the guide means whose position is fixed relative to the lower end portion of the mast. The shake can be completely prevented.

  In addition, by controlling the guide means while checking the image, the fiberscope can be securely inserted into the narrow opening of the upper tie plate of the fuel assembly, and the fiberscope can be placed at the position of the fuel rod to be checked. Can be inserted.

  According to the present invention, in order to confirm the soundness of the fuel, the fuel assembly is extracted by a refueling machine, transported to a specific dedicated inspection stand while holding it, and then returned to the original place after confirmation. Can be omitted. Considering that the number of fuel assemblies is large, the overall time can be shortened.

  Also, in the past, there was no choice but to operate the dedicated inspection fiberscope manually by a skilled inspector on a dedicated inspection stand, while the fiberscope was immediately attached to the fuel assembly when a normal fuel changer operator needed it. The time required for several months to prepare necessary equipment and personnel can be greatly reduced, and the working time can be remarkably shortened.

  Moreover, according to this invention, since the fiberscope is operated in deep pool water, the risk of exposure of the inspector can be prevented.

  The best mode for carrying out the present invention will be described below.

  FIG. 1 shows a refueling machine according to an embodiment of the present invention. The same parts as those in FIGS. 6 and 7 are denoted by the same reference numerals and redundant description is omitted.

  The fuel exchanger 1 according to the present embodiment has a main hoist 5 and has a structure in which the mast 6 can be expanded and contracted in the vertical direction by the main hoist 5.

  The lower end of the mast 6 is provided with a fuel assembly gripping portion 7 for gripping a fuel assembly handle (not shown).

  The refueling machine 1 of this embodiment has two fiberscopes 8 and 9 in the main hoist 5 and the mast 6. The fiber scopes 8 and 9 have photographing units 8a and 9a at the lower ends, respectively.

  The imaging unit 8a of the fiberscope 8 (first fiberscope) has a vertically downward imaging type condensing unit fiberscope, and the imaging unit 9a of the fiberscope 9 (second fiberscope) is of side direction imaging type. It has a condensing part fiberscope.

  The “photographing unit” here may be a normal camera, but preferably, the tip of each optical fiber of the fiberscopes 8 and 9 is provided with a lens function, and the image is received and transferred as a camera by an assembly of such optical fibers. Say what you can.

  By configuring the fiberscopes 8 and 9 with each optical fiber having a lens function, the fiberscopes 8 and 9 are shaped so as to be able to enter the inside of the fuel assembly from the gaps in the upper tie plate of the fuel assembly assembly. can do.

  On the refueling machine 1, fiberscope drawing means 10 and 11 capable of feeding or winding the fiberscopes 8 and 9 are provided.

  The fiberscope drawing means 10 and 11 are composed of drums 10a and 11a around which the fiberscopes 8 and 9 are wound, and driving means 12 for driving the drums 10a and 11a, respectively.

  By rotating the drums 10a and 11a by the driving means 12, the fiberscopes 8 and 9 are fed out or wound in the drum rotation direction.

  At the lower end of the mast 6, guide means 13 for guiding the lower ends of the fiberscopes 8 and 9 to a predetermined position is provided.

  The refueling machine 1 further includes display means 14 for displaying an image from the imaging unit of the fiberscope.

  The display means 14 is preferably capable of displaying the image from the imaging unit of the fiberscope on the display unit (monitor) in real time through a processing device including a photomultiplier tube and an optical signal preprocessing unit.

  Further, the refueling machine 1 includes fiberscope drawing means 10 and 11 and control means 15 for controlling the operation of the guide means 13.

  The control means 15 is preferably provided integrally with the display means 14. The fiberscope drawing means 10, 11 controls the driving of the drive means 12 of the fiberscope drawing means 10, 11, and the guide means 13 is a guide. Switching of the power (compressed air) switching valve of the means 13 and braking control are performed.

  Moreover, as shown in FIG. 1, the power source 16 for driving the guide means 13 is also provided.

  In the present embodiment, compressed air is used as power, and a compressed air tube 17 extends from the power source 16 to the guide means 13.

  Next, the structure of the guide means 13 will be described.

  FIG. 2 shows the guide means 13 in an enlarged manner.

  The guide means 13 has a holding portion 18 that loosely holds the lower ends of the fiberscopes 8 and 9. The holding portion 18 is preferably made of a sheath (cylindrical member) slightly larger in diameter than the fiber scopes 8 and 9, but is not limited to a tubular shape, and has a U-shaped engaging portion and other shapes that can be appropriately formed by those skilled in the art. It can be.

  The guide means 13 further includes a drive mechanism 19 that drives the holding portion 18 to a predetermined position in the horizontal plane and in the vertical direction.

  The drive mechanism 19 includes a vertical base rail 20 fixed vertically to the lower end of the mast 6, a vertical slide rail 21 that slides along the vertical base rail 20, and a slide along the vertical slide rail 21. A vertical traveling platform 22 is provided.

  A first horizontal base rail 23 is fixed to the vertical traveling platform 22 in the horizontal direction, and the first horizontal base rail 23 includes a first horizontal slide rail 24 that slides along the first horizontal base rail 23, and a first horizontal slide rail. 1 has a first horizontal platform 25 that slides along the line 24.

  Further, a second horizontal base rail 26 that is orthogonal to the first horizontal base rail 23 in the horizontal plane is fixed to the first horizontal platform 25, and the second horizontal base rail 26 slides along the second horizontal base rail 26. Two horizontal sliding rails 27 and a second horizontal traveling platform 28 that slides along the second horizontal sliding rail 27 and supports the holding portion 18 are provided.

  In the vertical direction, first, the vertical sliding rail 21 slides on the vertical base rail 20, and further the vertical traveling base 22 slides up and down on the vertical sliding rail 21. As a result, the vertical carriage 22 can move from the upper and lower ends of the vertical base rail 20 by the length of the vertical sliding rail 21, and the lower ends of the fiber scopes 8 and 9 within the horizontal planes of the respective heights. Can guide the part.

  Further, in the first horizontal direction (for example, the X direction) in the horizontal plane, the first horizontal sliding rail 24 slides on the first horizontal base rail 23, and the first horizontal sliding rail 24 further One horizontal carriage 25 slides. As a result, the second horizontal base rail 26 can move from one end of the first horizontal base rail 23 to the length of the first horizontal slide rail 24.

  Further, in the second horizontal direction (for example, Y direction) in the horizontal plane, the second horizontal sliding rail 27 slides on the second horizontal base rail 26, and further on the second horizontal sliding rail 27. The two horizontal carriages 28 slide. As a result, the second horizontal traveling base 28 can move from one end of the second horizontal base rail 26 to the length of the second horizontal sliding rail 27.

  In other words, the holding unit 18 supported by the second horizontal platform 28 can guide the lower ends of the fiberscopes 8 and 9 within the ranges in the vertical direction and the X and Y directions in the horizontal plane.

  FIG. 3 shows the operation of the fiberscope 8.

  The fiberscope 8 has a vertically downward photographing type condensing unit fiberscope 29 (photographing unit), and when it enters between the fuel rods 30, an image as shown in the right side of FIG. 3 is displayed. It can be sent to the display means 14.

  The fiberscope 9 has a condensing unit fiberscope 31 (photographing unit) of a side photographing type, and when it enters between the fuel rods 30, an image as shown in the right side of FIG. 4 is displayed. It can be sent to the means 14.

  In general, the vertical down-portion type concentrator fiberscope 29 is convenient for confirming and finding the state of the upper portion of the fuel assembly and the opening of the upper tie plate for entering the inside of the fuel assembly. . On the other hand, the side-portion type condensing unit fiberscope 31 is convenient for observing the state of the fuel rod 30.

  FIG. 5 shows an example of a method for controlling the drive mechanism 19.

  FIG. 5 shows only the drive mechanism (20, 21, 22) in the vertical direction and the drive mechanism (23, 24, 25) in the first horizontal direction (X direction) in the horizontal plane, but the second in the horizontal plane. The same applies to the driving mechanism (26, 27, 28) in the horizontal direction (Y direction).

  The inside of the vertical base rail 20 is divided into two chambers by a valve body 21 a that is a part of the vertical sliding rail 21, and the inside of the vertical sliding rail 21 is also a part of the vertical traveling base 22. 22a is divided into two chambers.

  The compressed air from the tube 17 is selectively supplied to the upper chamber or the lower chamber of the vertical base rail 20 by the switching valve 32.

  When the compressed air is supplied to the upper chamber of the vertical base rail 20, the vertical sliding rail 21 slides downward by the valve body 21a of the vertical sliding rail 21 being pushed downward.

  If compressed air is supplied to the lower chamber of the vertical base rail 20, the vertical slide rail 21 slides upward.

  The air in the upper chamber and the lower chamber of the vertical base rail 20 is irreversibly collected and selectively supplied to the upper chamber or the lower chamber of the vertical slide rail 21 by the next switching valve 33.

  When the compressed air is supplied to the upper chamber of the vertical sliding rail 21, the vertical traveling base 22 slides downward by pushing down the valve body 22a of the vertical traveling base 22.

  If the compressed air is supplied to the lower chamber of the vertical slide rail 21, the vertical carriage 22 slides upward.

  A braking means 34 is provided between the vertical base rail 20 and the vertical sliding rail 21, and a braking means 35 is provided between the vertical sliding rail 21 and the vertical traveling base 22.

  The braking means 34 and the braking means 35 can brake the sliding of the vertical sliding rail 21 or the vertical traveling platform 22 against the driving force by the compressed air and fix it at a predetermined position.

  Air in the upper chamber and the lower chamber of the vertical slide rail 21 is irreversibly collected and supplied to the first horizontal direction (X direction) drive mechanism (23, 24, 25) by the next switching valve 36. .

  The control in the drive mechanism (23, 24, 25) in the first horizontal direction (X direction) can be performed in exactly the same way.

  The control means 15 controls the drive mechanism 19 by controlling the operation of the switching valves 32, 33, 36 and the braking means 34, 35, so that the holding portion 18, that is, the lower ends of the fiber scopes 8, 9 are brought to a desired position. Can be moved.

  The control unit 15 guides the imaging units 8a and 9a of the fiberscopes 8 and 9 to a desired position under the control of the drive mechanism 19, and controls the fiberscopes 8 and 9 under the control of the fiberscope drawing out units 10 and 11. The photographing units 8a and 9a can be made to enter the fuel assembly.

  Hereinafter, the operation of the fuel changer according to the present invention will be described.

  According to the refueling machine 1 of the present invention, the photographing units 8a and 9a of the fiberscopes 8 and 9 are normally positioned at the lower end of the mast 6 where they do not interfere with the operation of the fuel assembly gripping unit 7, The state is displayed on the display means 14.

  When the fuel exchanger 1 grips the handle of the fuel assembly by the fuel assembly gripping portion 7, the operator can easily operate the fuel exchanger 1 by displaying an image of the gripping state of the handle on the display means 14. Make it possible.

  When checking the correctness of the fuel assembly relocation, the lower end portion of the mast 6 of the fuel exchanger 1 is brought close to the upper portion of the fuel assembly, and the fuel assembly stamped on the upper portion of the fuel assembly is changed. By displaying the video of the identification number on the display means 14, the identification number of the fuel assembly can be surely confirmed.

  When it is necessary to inspect the inside of the fuel assembly, the fuel assembly handle is preferably gripped by the fuel assembly gripping portion 7 first. Thereby, the fluctuation of the mast 6 is eliminated.

  Further, as in the above-described embodiment, the first fiberscope 8 having the vertically downward photographing type condensing unit fiberscope 29 (imaging unit), and the lateral direction photographing type condensing unit fiberscope 31 (imaging unit). When the second fiberscope 9 having the second fiberscope 9 is provided, the control means 15 brings the first fiberscope 8 and the concentrating fiberscopes 29 and 31 of the second fiberscope 9 close to the upper tie plate of the fuel assembly, The second fiberscope 9 having the side direction photographing type condensing unit fiberscope 31 is caused to enter the inside of the fuel assembly while the image of the lower direction photographing type condensing unit fiberscope 29 is displayed on the display means 14. . It is preferable that the display means 14 is configured to be able to switch an image from the vertically downward photographing type condensing unit fiberscope 29 or the side photographing type condensing unit fiberscope 31.

  Of course, while displaying the image of the condensing unit fiberscope 29 of the vertical downward photographing type on the display means 14, the fiberscope 8 having the condensing unit fiberscope 29 of the vertical downward photographing type is directly inside the fuel assembly. You may make it enter.

  According to the present invention, it is possible to insert the concentrating fiberscope 31 of the side-direction photographing type, which is usually difficult to insert, into the fuel assembly while confirming with the concentrating fiberscope 29 of the vertical downward photographing type. it can.

  In the example shown in FIGS. 1 to 5, the present invention includes a first fiberscope 8 having a vertically downward photographing type condensing unit fiberscope 29 and a second having a side photographing type condensing unit fiberscope 31. However, the number of fiberscopes is not limited to this, and may be two or more or one.

  Moreover, in the example shown in FIGS. 1-5, it had only the fiberscope which has an imaging | photography part in a lower end part, but the fiberscope for illumination which has an illumination part in a lower end part other than the fiberscope which has an imaging | photography part. You may make it have. In this case, a light source is provided outside the reactor well or the like, and a portion to be observed can be illuminated through the illumination fiberscope and its illumination section.

  Further, as shown in FIG. 1, by separately driving and controlling the drums 10a and 11a, the drawing of the fiberscopes 8 and 9 wound around the drums 10a and 11a can be independently controlled.

  As a result, as described above, an image is sent by the vertical downward photographing type photographing unit (condenser fiberscope 29), and the side photographing type photographing unit (condenser fiberscope 31) is inserted into the fuel assembly. can do.

  According to the present invention, with the fuel assembly handle 7 gripping the handle of the fuel assembly, the fiberscope photographing unit confirms the opening entering the inside of the fuel assembly by visual observation, and the fiberscope as it is. Can enter the inside of the fuel assembly.

  At this time, since the fuel assembly handle 7 holds the handle of the fuel assembly, the lower end portion of the mast 6 is fixed, and the fiber is guided by the guide means 13 whose position is fixed relative to the lower end portion of the mast 6. The fiber scopes 8 and 9 can be accurately inserted in the vicinity of the fuel rods visually selected via the display means 14 while the lower ends of the scopes 8 and 9 are completely prevented from shaking.

  Thereby, the soundness of the fuel assembly can be inspected easily and reliably.

  Conventionally, checking the integrity of the fuel assembly (fuel) requires dedicated inspection equipment and personnel, so it can only be started after a certain period of time has passed since the inspection was required. However, according to the present invention, when the necessity of inspection occurs, it can be immediately inspected, so that the soundness of the fuel assembly (fuel) can be quickly confirmed, and the inspection work of the power plant is greatly improved. It becomes possible to make it.

The block diagram of the fuel change machine by one Embodiment of this invention. The perspective view which expanded and showed the drive mechanism of the guide means by one Embodiment of this invention. Explanatory drawing which showed the state when the imaging | photography part of a perpendicular | vertical downward imaging | photography type was inserted between fuel rods, and the image | video at that time. Explanatory drawing which showed the state when the imaging | photography part of a side direction imaging | photography type was inserted between fuel rods, and the image | video at that time. Explanatory drawing which shows one of the methods of control of a drive mechanism. A side view of a refueling machine. The perspective view of a fuel change machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refueling machine 2 Carriage 3 Reactor well 4 Crossing device 5 Main hoist 6 Mast 7 Fuel assembly holding part 8 Fiberscope 9 Fiberscope 8a Imaging part 9a Imaging part 10 Fiberscope extraction means 11 Fiberscope extraction means 10a Drum 11a Drum 12 Drive means 13 Guide means 14 Display means 15 Control means 16 Power source 17 Tube 18 Holding portion 19 Drive mechanism 20 Vertical base rail 21 Vertical slide rail 21a Valve body 22 Vertical traveling base 22a Valve body 23 First horizontal base rail 24 1st horizontal sliding rail 25 1st horizontal traveling base 26 2nd horizontal base rail 27 2nd horizontal sliding rail 28 2nd horizontal traveling base 29 Condensing part fiberscope 30 of a vertical down photography type Fuel rod 31 Side direction Shooting-type condensing part Fiberscope 32 Switching valve 33 Switching valve 3 Braking means 35 braking means 36 switching valve

Claims (6)

In a fuel exchanger having a main hoist, having a fuel assembly gripping part that grips the handle of the fuel assembly at the lower end of the mast by vertically expanding and contracting the mast by the main hoist,
A fiberscope having a photographing part at the lower end passed through the main hoist and the mast;
A fiberscope drawing means capable of feeding or winding the fiberscope;
Guide means provided at the lower end of the mast for guiding the lower end of the fiberscope to a predetermined position;
Display means for displaying video from the imaging section of the fiberscope;
Control means for controlling the operation of the fiberscope drawing means and the guide means;
I have a,
The fuel exchanger according to claim 1, wherein the guide means includes a holding portion that gently holds a lower end portion of the fiberscope, and a drive mechanism that drives the holding portion to a predetermined position in a horizontal plane and in a vertical direction . The drive mechanism of the guide means includes a vertical base rail fixed perpendicularly to the lower end of the mast, a vertical slide rail that slides along the vertical base rail, and a slide along the vertical slide rail. A moving vertical platform,
A horizontal first horizontal base rail fixed to the vertical carriage, a first horizontal slide rail sliding along the first horizontal base rail, and along the first horizontal slide rail A sliding first horizontal platform,
A second horizontal base rail in a horizontal direction fixed so as to be orthogonal to the first horizontal base rail, a second horizontal slide rail sliding along the second horizontal base rail, and the second A second horizontal carriage that slides along a horizontal sliding rail and supports the holding portion;
The fuel changer according to claim 1 , comprising: The fiberscope, by the fiber scope抽送means, according to claim 1 or 2, characterized in that it is constituted from the gap of the upper tie plate of the fuel assembly within the can enter shape of the fuel assembly Refueling machine. The fiberscope has a first fiberscope having a vertical downward shooting type shooting unit, and a second fiberscope having a side shooting type shooting unit,
The display means is configured to display the first fiberscope and the second fiberscope in a switchable manner,
The control means, after the fuel assembly gripping part grips a handle of a predetermined fuel assembly, brings the imaging parts of the first fiberscope and the second fiberscope closer to the upper tie plate of the fuel assembly, and The first fiberscope and the second fiberscope can be controlled so that the second fiberscope enters the fuel assembly while displaying the image of one fiberscope on the display means. The refueling machine according to any one of claims 1 to 3 , wherein the refueling machine is provided. The fiberscope includes a fiberscope plurality, the control means according to any one of claims 1-4, characterized in that it is configured to be able to independently control the抽送each fiberscope Refueling machine. The fuel changer according to claim 1 , further comprising an illumination fiberscope having an illumination part at a lower end part.