JPH03189597A - In-reactor inspection device for nuclear reactor - Google Patents

Abstract

PURPOSE:To confirm the soundness of a reactor core support plate and a reinforcing plate in a range wider than a grating frame by providing the inspection device which can approach the top surface of the reactor support plate or the flank of the reinforcing plate by passing in the grating of an upper grating plate. CONSTITUTION:When inspection is performed, a fuel assembly and a control rod guide tube are detected and a reactor core support plate inspection device 1 is moved down by a suspension lowering jig 2 fitted to a fuel gripping mechanism; and then the support body 4 of the device 1 passes the grating of the upper grating plate 30, a lower guide part 9 is inserted into the hole 11 of the reactor core support plate 10, and a step part 6 is supported by the edge of the hole 11. At this time, a bottom plate 8 is set almost flush with the top surface of the support plate 10. Further, the upper guide part 32 of a positioning part 3 is inserted into the grating of the grating plate 30 and the horizontal inspection range of the device 1 is set. An ultrasonic probe 12 is extended from its storage position to an extension position by a driving guide device 13 and a scan is made in a specific direction to perform inspection. The direction of the probe 12 is changed and the device 1 is only moved to another hole 11 to inspect the periphery of the support plate 10 over a wide range.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to in-reactor working equipment such as an in-reactor inspection device for a nuclear reactor and an in-reactor fallen object collection device, and particularly relates to an in-reactor working device such as an in-reactor inspection device for a nuclear reactor, an in-reactor fallen object recovery device, etc. The present invention relates to an in-core inspection device suitable for detecting damage in the event that damage occurs to a certain core support plate.

[Conventional technology]

Japanese Unexamined Patent Application Publication No. 1983-1989 is a well-known device for inspecting the inside of a nuclear reactor.
There are those described in publications such as No. 66162 and JP-A No. 62-67446. This known reactor inspection device inspects the upper grid plate as the reactor internal structure, and the supporting part of the inspection device body carried at the tip of the hanging tool is sandwiched between two adjacent grid plates. The support part is fixed to the grid plate from the side with an air cylinder, and an ultrasonic probe is scanned inside the two grid plates to inspect the grid plate for damage.

[Problem to be solved by the invention]

However, the above-mentioned conventional reactor interior inspection equipment only inspects the upper lattice plate of the reactor internal structure, and does not pay attention to the inspection of the core support plate located below the upper lattice plate. There was a problem that the support plate could not be inspected.

In other words, the inspection device for the upper grating plate has an ultrasonic probe placed inside the adjacent grating plate to detect damage in the event that damage occurs near the lattice-like combination of the grating plates. In this case, it is required to inject an ultrasonic beam from any direction inside the grid plate.

On the other hand, the core support plate is located below the upper lattice plate, and a reinforcing plate is vertically welded to the bottom surface of the core support plate, so it is important to ensure the integrity of the welded area. When inspecting such a core support plate, the inspection equipment must be able to pass between the grids of the upper grid plate in order to approach the core support plate, and the inspection range must include the area directly below the intersection of the upper grid plate. Since the vertical reinforcing plates on the upper surface of the core support plate and the lower surface of the core support plate are included, it is necessary to apply ultrasonic beams to the welding area from multiple directions over a wider area than the lattice frame of the upper lattice plate. It is something that

As described above, there is a fundamental difference between the inspection of the upper grid plate and the inspection of the core support plate, and conventional upper grid plate inspection equipment cannot be applied to the inspection of the core support plate.

An object of the present invention is to provide an in-core inspection device for a nuclear reactor suitable for inspecting a core support plate.

Another object of the present invention is to provide an in-core working device such as an in-core inspection device, an in-core fallen object recovery device, etc., which utilizes a core support plate.

[Means and effects for solving the problems] In order to achieve the above object, the present invention provides a core support plate in which a number of holes are made and a number of reinforcing plates are vertically welded to the lower surface, and An in-core inspection device for a nuclear reactor having an upper grid plate located above the plate, a support partially inserted into a hole in the core support plate and held by the core support plate, and a non-destructive inspection device. , an inspection device main body, which is attached to the support and includes a drive guide means for moving the non-destructive inspection device at least horizontally between a storage position inside the support and an advanced position outside the support; a suspending means that supports a support at one end and suspends the inspection device main body from the upper part of the reactor through the upper grid plate to approach a hole in the core support plate; and positioning means for positioning in the rotational direction with respect to the center and defining a horizontal inspection range of the inspection device main body.

In the present invention configured in this manner, the inspection device main body is lowered from the upper part of the core through the upper grid plate to the core support plate by the lifting means, and the support body is inserted into the hole in the core support plate and is supported by the core support plate. be done. At this time, the rotational direction of the inspection device body is determined by the positioning means, and
A horizontal inspection range is set. Next, the non-destructive testing device, for example, an ultrasonic probe, is moved out from the storage position to the advanced position by the drive guide means, and is scanned in a predetermined direction to inspect a required location. As a result, even if the inspection device main body has a size that allows it to pass through the lattice frame of the upper lattice plate, the welded part near the intersection of the upper lattice plate on the top surface of the core support plate and the side of the reinforcing plate perpendicular to this can be Injecting an ultrasonic beam makes it possible to inspect the area.

In particular, the support body of the inspection device body has a bottom plate that is substantially flush with the upper surface of the core support plate when the support body is supported by the core support plate, and the inspection device body is non-destructively controlled by the drive guide means. The inspection device can be configured to move along the bottom plate and the top surface of the core support plate, and in this case, the inspection device main body is used for inspecting the top surface of the core support plate.

Further, the support body of the inspection device main body has a bottom plate that is located below the lower surface of the core support plate when the support body is supported by the core support plate, and the inspection device body is subjected to non-destructive inspection by a drive guide means. The device may be configured to move along the side surface of the reinforcing plate (in this case, the inspection device main body is used for inspecting the reinforcing plate.

Furthermore, the support body of the inspection device body is provided with a support top plate attached to the suspension means and a support top plate, and is engaged with a hole in the core support plate at the outer periphery to hold the support body on the core support plate. a cylindrical support plate with stepped portions, and the drive guide means also moves the non-destructive testing device in a direction perpendicular to the support; It may be possible to perform both the core support plate inspection and the reinforcing plate inspection by using the test equipment. becomes.

The positioning means can be structured to be guided by and engaged with the upper lattice plate, thereby making it possible to position in the rotational direction using the upper lattice plate.

As the drive guide means, any mechanism such as a feed screw mechanism, a telescopic arm mechanism, etc. can be used.

In order to achieve the above object, the present invention also provides an in-core working device for a nuclear reactor, which has a core support plate with a large number of holes and an upper grid plate located above the core support plate. A support body that is partially inserted into a hole in a core support plate and held by the core support plate, a working part, and a working part that is attached to the support body and moves the working part to a storage position inside the support body and an advancement outside the support body. a working equipment main body having a driving guide means for moving the working equipment to and from the reactor core support plate; and a positioning means for positioning the support body in a rotational direction with respect to the axis of the suspension means to define a horizontal working range of the working device main body. It is.

In the present invention configured as described above, if the working part is a non-destructive detection device, the above-mentioned in-reactor detection device for a nuclear reactor can be obtained, and if the working part is a jig for collecting fallen objects inside the reactor, the reactor interior detection device can be obtained. A device for collecting fallen objects inside the furnace is obtained.

[Embodiments] Preferred embodiments of the present invention will be described below with reference to FIGS. 1 to 16.

First, a first embodiment of the present invention will be described with reference to FIGS. 1 to 8. This embodiment is an example of inspecting a core support plate of a nuclear reactor.

In FIG. 1, 1 is a core support plate inspection device that constitutes the main body of the inspection device of this embodiment, and the core support plate inspection device 1
is inserted into the reactor by a lifting jig 2.

A positioning section 3 is attached to the hanging jig 2 to position the inspection device 1 in the rotational direction with respect to the axis thereof, and to set the inspection range of the inspection device 1 in the horizontal direction.

The core support plate inspection device 1 includes a support body 4 that constitutes a housing.
The support body 4 has a partially disc-shaped top plate 5 attached to the tip of the hanging jig 2, and a partially cylindrical top plate fixed to the circumference of the top plate 5 and having a stepped portion 6 on the outer circumferential surface. a support plate 7;
It is fixed to the lower end of the cylindrical support plate 7 and consists of a conical lower guide part 9 having a flat bottom plate 8 inside.

A large number of round holes 11 are drilled in the core support plate 10 to be inspected, and when the lowering jig 2 is lowered with the tip of the lower guide portion 9 inserted into the round holes 11, the cylindrical support plate 7
The stepped portion 6 engages with the edge of the round hole 11 of the core support plate 10, and the inspection device 1 is supported by the core support plate 10 at the hole portion. The height of the bottom plate 8 is set so that it is substantially flush with the upper surface of the core support plate 10 at this time.

On the bottom plate 8 of the support 4, there is provided a device for horizontally moving an ultrasonic probe 12, which is a non-destructive testing device, between a storage position inside the support 4 and an advanced position outside the support 4. A drive guide device 13 is attached. The drive guide device 13 is
Welded portion 15 between core support plate 10 and reinforcing plate 14 on its lower surface
an X-axis direction drive unit 16 for feeding out the probe 12 in the X-axis direction perpendicular to and,
It is comprised of a Y-axis direction drive section 18 for scanning the probe 12 in the Y-axis direction parallel to the S-axis direction. The X-axis direction drive section 16, the S-axis direction drive section 17, and the Y-axis direction drive section 18 each include a drive/position detection section 19, 20.21 including a DC motor and a position detection encoder, and a gear box 22.23. 24, and feed screws 25, 26.
It is equipped with 27 mag.

The ultrasonic probe 12 is connected to the feed screw 27 of the Y-axis direction drive unit 18.
It is attached to a movable table 28 that is screwed into the body, and performs injection of ultrasonic beams and reception of echoes.

Since the bottom plate 8 is on substantially the same plane as the upper surface of the core support plate 10, the ultrasonic probe 12 can be easily transferred from the surface of the bottom plate 8 to the surface of the core support plate 10 by the operation of the drive guide device 13.

As shown in FIG. 2, the positioning section 3 includes an upper grid plate 30.
A rectangular plate member 31 that engages with the upper end surface, and a square bell-shaped plate member that is integrally provided on the lower surface of the plate member 31, is guided inside the lattice frame of the upper lattice plate 30, and fits therein. It is composed of an upper guide section 32. Both the plate-shaped member 31 and the upper guide part 32 have ring members 33 and 34 in the center, and these ring members 33 and 34 have key grooves into which the keys 35 attached to the hanging jig 2 fit. The action of this key restricts the rotation of the positioning part 3 with respect to the hanging jig 2, while allowing the positioning part 3 to slide in the axial direction.

Stoppers 36 and 37 are provided at both ends of the key 35 to limit the sliding range of the positioning part 3.

When the hanging jig 2 is lowered with the tip of the upper guide part 32 in the lattice frame of the upper lattice plate 30, the pyramid shape of the upper guide part 32 is guided to align with the lattice frame, and the hanging is completed. The lowering jig 2 is positioned in the rotational direction, and the inspection device 1 is correspondingly positioned in the rotational direction.

At this time, variations in the axial distance between the inspection device 1 and the positioning section 3 and the distance between the core support plate 10 and the upper grid plate 30 are absorbed by the axial sliding of the positioning section 3, and the Both portions 3 are securely attached to each core support plate 1.
0 and the upper grid plate 30.

FIG. 3 shows the overall configuration of the in-core detection device of this embodiment. Here, the upper lattice plate 30 supports the fuel assemblies 40, and as shown in FIG. 4(A), the plates are combined in a lattice shape, and the fuel assemblies 40 are arranged one by one within the frame. A control rod guide tube 41 is arranged below the fuel assembly 40, and the above-mentioned round hole 11 is formed in the core support plate 10 as shown in FIG.
), a large number of holes are drilled to form support holes for the control rod guide tube 41.

FIG. 5 shows the arrangement relationship between the lattice of the upper lattice plate 30 and the round holes 11 of the core support plate 10 when viewed from a plane.

The circular holes 11 are located inside the lattice of the lattice plate 30 and are in contact with the lattice. The support body 4 of the inspection device 1 is made to have dimensions that allow it to pass through the grid of the grid plate 30.

Returning to FIG. 3, 42 is the fuel exchange machine, and the fuel exchange machine 4
2 runs on a traveling trolley 43, extends a fuel exchange rod-shaped jig 44 into the reactor, and replaces the fuel assembly 40 with a fuel gripping mechanism 45 provided at its tip.

46 is a work floor, where the control device 47 of the inspection device 1 is installed.
, a data recording device 48, a data processing device 49, etc. are installed, and are connected to the inspection device 1 with a cable 50 to set the inspection device 1, drive the ultrasonic probe 12, record and process flaw detection data, and display various charts. Output etc.

The operation of the in-core inspection device of this embodiment is performed using the fuel exchanger 42, and when inspecting, first the fuel assembly 4
0 and the control rod guide tube 41 below it, the hanging jig 2 is attached to the fuel gripping mechanism 45 and suspended. With this operation, the support 4 of the inspection device 1 passes through the grid of the upper grid plate 30, and the lower guide portion 9 of the support 4 passes through the grid of the upper grid plate 30.
is inserted into the round hole 11 of the core support plate 10, and the stepped portion 6 is supported by the hole edge of the core support plate. In addition, the positioning part 3
The upper guide portion 32 is inserted into the lattice of the upper lattice plate 30, the rotation direction of the inspection device 1 is determined, and the horizontal inspection range is set.

Next, the drive guide device 13 is driven, and the ultrasonic probe 12
The machine is moved from the storage position to the extended position and scanned in a predetermined direction to inspect the necessary areas.

FIG. 6 shows a conceptual diagram when flaw detection is performed from the upper surface of the core support plate 10 in the vicinity of the welded portion 15 with the reinforcing plate 14 using the core support plate inspection apparatus 1 of this embodiment.

Since the ultrasonic beam 55 is injected from the ultrasonic probe 12, if there is damage such as a crack near the welded part of the core support plate 10, the echo from this crack is received and the crack can be detected. becomes possible. The direction of injection of the ultrasonic beam 55 can be changed by changing the direction of the ultrasonic probe 12 or inserting the inspection device 1 into the support round hole 11 of the adjacent control rod guide tube, and changing the direction of rotation of the inspection device 1. This can be carried out by changing the positioning of 90°.

An example of a scanning pattern is shown in FIGS. 7 and 8. 7th
The figure shows an example of Y-X scanning, and FIG. 8 shows an example of XY scanning.

As described above, according to this embodiment, while the inspection device 1 is dimensioned to pass through the lattice of the upper lattice plate 30, the core supporting plate is The soundness of the core support plate 10 can be confirmed by injecting an ultrasonic beam into the vicinity of the welded portion 15 of the core support plate 10 .

Note that the positioning part in the rotational direction may be provided with an air cylinder 57 in the upper guide part 32 like the positioning part 3A shown in FIG. 30 can be firmly fixed.

A furnace inspection apparatus according to another embodiment of the present invention will be explained with reference to FIGS. 10 and 11. In the figure, members equivalent to those shown in FIG. 1 are given the same reference numerals. This embodiment is an example in which the side surface of a reinforcing plate welded to the lower surface of a core support plate is inspected.

In FIG. 10, a reinforcing plate inspection device 60 constituting the main body of the inspection device of this embodiment has a support 4A attached to the tip of the hanging jig 2, and a cylindrical support plate 7A of the support 4A. is not provided with a step, and the core support plate 10
The outer peripheral portion of the top plate 5 forms a stepped portion 6A that can be engaged with the edge of the round hole 11.

Drive guide device 13A for scanning the ultrasound probe 12
In order to scan the surface of the ultrasonic probe 12 along the side surface of the reinforcing plate 14 in contact therewith, a Y-axis direction drive unit 18A is installed vertically.

Further, the drive guide device 13A includes the X-axis direction drive section 16, S
In addition to the axial drive unit 17 and the Y-axis drive unit 18A, since scanning in the vertical direction along the reinforcing plate 14 is required, the ultrasonic probe 12 is moved in the Z-axis direction perpendicular to the X-axis and the Y-axis. It further includes a biaxial drive section 62 for scanning. As a result, the drive guide device 13A differs from the embodiment shown in FIG.
is suspended. The X-axis direction drive unit 62, like the other drive units 16, 17.18A, includes a drive/position detection unit 63 including a DC motor and a position detection encoder, a gear box 65, a feed screw 66, and the like. Support 4
The bottom plate 8A of A is provided sufficiently below so as not to interfere with scanning in the Z-axis direction.

When the hanging jig 2 is lowered with the tip of the lower guide part 9 in the round hole 11, the entire length of the cylindrical support plate 7A is inserted into the round hole 11, and is formed at the outer periphery of the top plate 5. The stepped portion 6A engages with the edge of the round hole 11, and the inspection device 60 is supported. In this state, the drive guide device 13A is located below the core support plate 10, is attached perpendicularly to the support plate 10, and inspects the welded portion 14 and its vicinity on the side surface of the reinforcing plate 14.

FIG. 11 shows a conceptual diagram when flaw detection is performed on the reinforcing plate 14 using the apparatus of this embodiment. An ultrasonic beam 55 is emitted from the ultrasonic probe 12 . If there is a crack near the weld 15, an echo is received and the crack can be detected. The direction of injection of the ultrasound beam 55 is changed by changing the orientation of the ultrasound probe 12.

According to this embodiment, while the inspection device 60 is dimensioned to pass through the lattice of the upper lattice plate 30, the welded portion 15 of the reinforcing plate 14 is The soundness of the reinforcing plate 14 can be confirmed by injecting an ultrasonic beam into the vicinity.

Still another embodiment of the present invention will be described with reference to FIG.

This embodiment is an example in which the reinforcing plate inspection device 60 shown in FIG. 10 is commonly used as an inspection device for the core support plate 10.

In FIG. 12, a core support plate inspection device 70 of this embodiment is shown.
The cylindrical support plate 7A and the bottom plate 8A in FIG.
The cylindrical support plate 7 and bottom plate 8 shown in the figure have been changed. That is, the stepped portion 6 that engages with the edge of the round hole 11 of the core support plate 10 is provided on the cylindrical support plate 7, and when supported by the stepped portion 6, the surface of the bottom plate 8 is approximately the same as the upper surface of the core support plate 10. Become the same surface. Further, the ultrasonic probe 12 is mounted on the moving table 28 with the L-shaped member 7.
1 so that an ultrasonic beam can be applied to the upper surface of the core support plate 10. The other configurations are the same as the embodiment shown in FIG.

Flaw detection according to this embodiment can be performed in the same manner as explained in FIGS. 6 to 8.

According to this embodiment, the cylindrical support plates 7, 7A and the bottom plate 8
, 8A, and the L-shaped member 71, by selectively using them, the reinforcing plate inspection device 60 of FIG.
It is easy to change the core support plate inspection device 70 to the core support plate inspection device 70, or vice versa, and most of the mechanisms can be shared, which is advantageous in terms of cost.

Still another embodiment of the present invention will be described with reference to FIG.

This embodiment shows a modification of the drive guide means.

In FIG. 13, a core support plate inspection device 75 of this embodiment is shown.
uses a telescopic arm mechanism in place of the feed screw mechanism for the Y-axis direction drive section 18B of the drive guide device 13B. That is, the Y-axis direction drive section 18B uses a telescopic arm 76 such as an air cylinder as a drive guide means, and a movable table 77 on which the ultrasound probe 12 is mounted is attached to the tip of the telescopic arm 76. Air is sent in when the arm is extended, and when the arm is retracted, it is pulled by the drive/position detection section 21. Ultrasonic probe 12
The scanning is similar to that described in FIGS. 6 to 8.

In this embodiment, the telescopic arm mechanism is employed only in the Y-axis direction drive section, but this method can also be used in the X-axis direction drive section, the S-axis direction drive section, and the Z-axis direction drive section.

In this way, the drive guide device 13B includes the ultrasonic probe 12.
Various mechanisms can be used as long as the required scanning can be performed. For example, an articulated arm mechanism may be used as another example.

Still another embodiment of the present invention will be described with reference to FIG.

In this embodiment, the advancing range of the Y-axis direction drive section is expanded.

In FIG. 14, the drive guide device 13C of the core support plate inspection device 80 is configured as a part of the S-axis direction drive section 17C.
A track 81 and a rack 82 are attached to the back of the axial drive section 18, and a track 81 and a rack 82 are attached to the back of the axial drive section 18.
A pinion 85 that meshes with a wheel 84 and a rack 82 that engage with the rack 82 is attached, and the pinion 85 is driven by a drive/position detection section 86.

According to this embodiment, by driving the drive/position detection section 86, the Y-axis direction drive section 18 can further move in the opposite direction with respect to the movable table 83 of the S-axis direction drive section 17C. The ultrasonic probe 12 is attached to the support 4 in both directions of the Y axis.
It is possible to move between the P position that has advanced to the outside of the Q position and the Q position.
A wider range can be inspected.

In addition, in each of the above embodiments, the X-axis, S-axis,
Drive and position detection of the Y-axis direction drive unit or the X-axis, S-axis, Y-axis, and Z-axis direction drive units are performed by DC motors, encoders, air cylinders, etc. as described above, but these are used underwater. Therefore, it is manufactured with sufficient attention to sealing performance.

Still another embodiment of the present invention will be described with reference to FIG.

This embodiment uses a configuration in which the upper grid plate is not used for the positioning section in the rotational direction.

In FIG. 15, the reactor interior inspection device of this embodiment has a rotationally driven positioning section 3B that can be stopped at a desired angle between the lifting jig 2 and the support body 4 of the core support plate inspection device 87. It is set up.

According to this embodiment, the positioning parts 3, 3A are connected to the upper grid plate 3.
Core support plate inspection device 8 without lifting and rotating from 0
7 can be set in the rotational direction, making the work easier.

Still another embodiment of the present invention will be described with reference to FIG. 16.

In this embodiment, the in-furnace working device of the present invention is applied to an in-furnace fallen object recovery device.

In FIG. 16, the main body 90 of the in-furnace fallen object collection device of this embodiment has a support 4D attached to the tip of the hanging jig 2, and the cylindrical support plate 7D of the support 4D is connected to the fallen object. The inspection device is designed to be longer than the above-mentioned inspection device so as to be suitable for collecting. Further, the recovery device main body 90 has a hand 91 as a falling object recovery jig, and the hand 91 is positioned by a multi-joint arm type drive guide device 13D. Further, an optical monitoring device 99 is provided near the hand 91. Above the hanging jig 2, as in the embodiment of the inspection device, there is a positioning part 3 (first
(see figure) is provided.

Note that, for example, a gripping jig or a suction jig can be used for the hand 91, and in this embodiment, a gripping jig is used.

The multi-joint arm type drive guide device 13D is an arm rotation drive provided between the first, second and third arms 93, 94, 95, the top plate 5 of the support body 4D and the cylindrical support plate 7D. part 96, arm mounting rotation part 97, and hand 91
and the third arm 95.
It consists of 8. That is, in the embodiment of the inspection apparatus described above, a drive guide device having a rectangular coordinate system was used, but in this embodiment, a polar coordinate system is used.

The degrees of freedom of the drive guide device 13D using the polar coordinate system are: ■ Rotation R1 of the arm mounting rotation part 97, ■ Rotation R2 of the first arm 93, ■ Rotation R3 of the second arm 94, ■ Rotation R3 of the third arm 95. rotation R4, and (2) rotation R5 of the cutting edge 1 rotating portion 98, which have five degrees of freedom. When a gripping jig is adopted as the hand 91, the drive shaft for the gripping motion G also operates. However, if a suction jig is used, the grasping motion G can be omitted.

Although not shown, the fallen object recovery device of this embodiment is separately provided with a control device and a monitoring device outside the reactor.

With the tip of the lower guide part 9 in the round hole 11, the hanging jig 2 is lowered, and the step part 6 of the cylindrical support plate 7D is engaged with the edge of the round hole 11 to support the collection device main body 90. . In this state, the drive guide device 13D is operated, and while monitoring with the optical monitoring device 99, the fallen object on the core support plate 10 is grabbed with the hand 91 and collected on the bottom plate 8.

According to this embodiment, there is an effect that fallen objects on the core support plate 10 can be collected.

〔Effect of the invention〕

According to the present invention, it passes inside the lattice of the upper lattice plate of the reactor internals, approaches the upper surface of the core support plate or the side surface of its reinforcing plate, and extends over a wider range than the lattice frame of the upper lattice plate. Ultrasonic beams are applied to the weld between the core support plate and reinforcement plate from multiple directions to confirm the integrity of the core support plate and reinforcement plate, improving the reliability of nuclear power plants. There are effects that can be achieved.

In addition, the structure installed above the core support plate, which is necessary for inspecting the core support plate, can be removed by installing the structure in only one round hole of the core support plate.
Preparation for inspection and cleaning up afterwards can be done easily, which has the effect of improving work efficiency.

Furthermore, if a recovery tool jig is used instead of the non-destructive inspection device, fallen objects on the core support plate can be recovered.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of a core support plate inspection device and a positioning section of an in-core inspection device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the positioning section, and FIG. 4A and 4B are perspective views of the upper grid plate and the core support plate, respectively, and FIG. 5 is a schematic diagram showing the overall configuration of the inspection device. 6 is a diagram showing the arrangement relationship seen from a plane, and FIG. 6 is a conceptual diagram when flaw detection is performed on a core support plate using the apparatus shown in FIG.
7(A) and 7(B) are diagrams showing an example of a scanning pattern when performing flaw detection on a core support plate, and FIG. 8(A)
and (B) are diagrams showing other examples of scanning patterns when performing flaw detection on the core support plate, FIG. 9 is a sectional view showing a modification of the positioning part, and FIG. FIG. 11 is a partially cutaway perspective view of a reinforcing plate inspection device and a positioning part of an in-core inspection device according to an embodiment of the present invention; FIG. FIG. 13 is a partially cut away perspective view of a core support plate inspection device of an in-core inspection device according to still another embodiment of the present invention.
FIG. 14 is a partially cut away perspective view of a core support plate inspection device of an in-core inspection device according to yet another embodiment of the present invention.
15 is a perspective view of a core support plate inspection device for an in-core inspection device according to still another embodiment of the present invention, and FIG. 15 is a core support plate inspection device for an in-core inspection device according to still another embodiment of the present invention FIG. 16 is a perspective view of an in-furnace fallen object recovery device according to still another embodiment of the present invention. Explanation of symbols '1. 70, 75, 80.87... Core support plate inspection device (inspection device main body) 2... Hanging jig 3.3A, 3B... Positioning part 4.4A, 4D. ...Support body 6...Step part 8.8A...Bottom plate 10...Core support plate 11...Round hole 12...Ultrasonic probe (non-destructive testing device) 13.13
A to 13D... Drive guide device 14... Reinforcement plate 15... Welding section 30... Upper grid plate 60... Reinforcement plate inspection device (inspection device main body) 90...
Collection device main body 91...hand (collection jig)

Claims (9)

[Claims] (1) In an in-core inspection device for a nuclear reactor, which has a core support plate with many holes drilled and many reinforcing plates vertically welded to the lower surface, and an upper grid plate located above the core support plate. , a support body partially inserted into the hole of the core support plate and held by the core support plate; a non-destructive inspection device attached to the support body, and a storage position of the non-destructive inspection device inside the support body; and a drive guide means for moving the inspection device body in at least a horizontal direction between the support body and an advanced position outside the support body; a hanging means for suspending through a lattice plate and approaching a hole in the core support plate; and positioning the support body in a rotational direction with respect to the axis of the hanging means, and controlling a horizontal inspection range of the inspection device main body. An in-furnace inspection device characterized by comprising positioning means for determining the position. (2) An in-furnace inspection apparatus according to claim 1, wherein the positioning means is guided by the upper grid plate and engages with it to perform positioning in the rotational direction. (3) In the reactor inspection device according to claim 1, the support body of the inspection device main body has a bottom plate that is substantially flush with the top surface of the core support plate when the support body is supported by the core support plate. An in-core inspection device, wherein the drive guide means moves the non-destructive inspection device along the bottom plate and the upper surface of the core support plate. (4) In the in-core inspection device according to claim 1, the support body of the inspection device main body has a bottom plate located below the lower surface of the core support plate when the support body is supported by the core support plate. An in-furnace inspection device, wherein the drive guide means moves the non-destructive inspection device along a side surface of the reinforcing plate. (5) In the reactor inspection device according to claim 1, the support of the inspection device main body is provided with a support top plate attached to the suspension means and the support top plate, and the core support plate is provided on the outer peripheral portion. a cylindrical support plate having a stepped portion that engages with a hole in the support plate to hold the support body on the core support plate; An in-core inspection device characterized in that the core support plate and the reinforcing plate are both inspected by using cylindrical support plates having stepped portions of different heights. . (6) The furnace inspection apparatus according to claim 1, wherein the drive guide means includes a feed screw mechanism. (7) The furnace inspection apparatus according to claim 1, wherein the drive guide means includes a telescoping arm mechanism. (8) In an in-core working device for a nuclear reactor having a core support plate with a large number of holes and an upper grid plate located above the core support plate, partially inserted into the holes of the core support plate. a support body held by a core support plate, a working part, and a drive guide means attached to the support body and for moving the working part between a storage position inside the support body and an advanced position outside the support body. a working device main body comprising: a working device main body; and a hanging means that supports the support at one end, suspends the working device main body from the upper part of the reactor through the upper grid plate, and causes the working device main body to approach the hole in the core support plate; An in-furnace working device comprising: positioning means for positioning the support body in a rotational direction with respect to the axis of the hanging and lowering means, and determining a horizontal working range of the working device main body. (9) In a reactor fallen object recovery device for a nuclear reactor, which has a core support plate with a large number of holes and an upper grid plate located above the core support plate, the holes in the core support plate partially A support is inserted into the reactor and held by the core support plate, a fallen object recovery jig is attached to the support, and the recovery jig is moved between a storage position inside the support and an advanced position outside the support. a recovery device main body having a drive guide means for moving the recovery device body between the reactor cores, and a recovery device body having one end supporting the support body, the recovery device body being suspended from the upper part of the reactor through the upper grid plate, and inserted into the hole in the core support plate. An in-furnace furnace characterized by comprising: a lifting means for bringing the supporting body close to the equipment; and a positioning means for positioning the support body in a rotational direction with respect to the axis of the lifting means and determining a horizontal working range of the recovery device main body. Fallen object recovery device.