JPS6254161A - Checking device for reactor vessel body part - Google Patents

Abstract

PURPOSE:To simplify the structure to facilitate the control of driving operation and to check a reactor vessel body part efficiently by rotating the second guide body itself. CONSTITUTION:The second guide bodies 34a and 34b are rotated. In case of checking in the peripheral direction, the second running body 35a is run and a screw rod is rotated at a prescribed speed forward and backward for every prescribed rotation number while running the first running body 33. Then, probes for transmission and reception are moved back and forth in directions opposite to each other with weld line as the boundary to scan a prescribed range. In case of checking in the axial direction, the running body 33 is run and the second running body 35b is allowed to face the weld line and a driving device for scanning is moved back and forth while running the running body 35b. A probe scans a prescribed range with the weld line as the center. The position of the running body 35a is shifted successively by length corresponding to the scanning range of the probe each time when the running body 33 is rotated once, thereby checking all of the outside peripheral surface of a reactor vessel body part 31.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is useful for in-service inspections that are required to be carried out regularly after the start of operation of a nuclear reactor. This article concerns an inspection of 114 parts of the reactor vessel, in which an ultrasonic flaw detection test of the welded portion of the reactor vessel body is automatically performed by remote control.

2. Description of the Related Art A conventional nuclear reactor vessel barrel inspection apparatus will be explained with reference to FIGS. 14 and 15. Figure 14 shows a system in which, after removing nuclear fuel and other items contained in the reactor from the reactor vessel 1, an underwater inspection device is installed inside the reactor vessel 1, and an ultrasonic flaw detection test is performed on the welds from the inside. It shows. In Fig. 14, 2 is the water surface, 3 is the operation deck, 4 is the power panel, 5 is the data acquisition board, 6 is the ultrasonic flaw detection device main body, and 7 is the position control i.
ll board, 8 is a cable, 9 is a rotating frame, 10 is a rotating drive device, 11 is a rail, 12 is an elevator, 13 is a vertical drive device, 14 is a stainless steel wire, 15 is a guide frame, 16
21 is a manipulator, 22 is a guide roller, and 23 is a welding line.

FIG. 15 shows an ultrasonic flaw detector 26 running along a track 25 permanently installed on the outer peripheral surface of the reactor vessel body 24 along a welded part.
This shows a device that performs ultrasonic flaw detection tests by driving the

However, the insulation along the axial and circumferential welds is 4.
427, the track 25 is guided by a track 25 that is permanently installed inside the 427, and the track 25 runs along the vertical axis 3C! 25a and the circumferential track 25b along the circumferential direction, and a bracket (not shown) is connected by the reactor shielding wall 28.
It is a one-piece 4f4 structure that is supported through. Vertical track 25a
A turntable 29 is provided at the intersection of the vertical axis 3a25a and the circumferential orbit 25b, and by rotating the turntable 29, the drive device 30 equipped with the ultrasonic flaw detection device @26 travels by switching between the vertical axis 3a25a and the circumferential orbit 25b. do.

Problems to be Solved by the Invention However, with the conventional device shown in Fig. 14, it is necessary to mount a large and complicatedly shaped inspection device with high accuracy every time an inspection is carried out during the service period, which takes a long time. , the period of in-service inspections is being extended. Also, since most of the inspection equipment is submerged in the cold reactor ID water,
After the inspection is completed, the equipment must be decontaminated.

Further, in the conventional device shown in FIG. 15, the number of tracks 25 equal to the number of welding lines is required, making the overall construction complicated and the installation cost extremely high. Also, the location of the flaw detection scan is i! The inspection was limited to the welded area along the line 25, and it was not possible to inspect the entire area.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inspection device for the chest of a nuclear reactor vessel that solves the above-mentioned conventional problems.

Means for Solving the Problems In order to solve the above problems, a part of the inspection device of the reactor vessel 1 of the present invention has an annular nozzle installed along the circumferential direction near the outer peripheral surface of the chest of the reactor vessel. a first guide body, and a first traveling body guided by the first guide body, which are arranged at appropriate intervals in the circumferential direction along the axial direction near the outer peripheral surface of the chest of the reactor vessel. a plurality of second guide bodies connected to the first running body; and at least two sets of second guide bodies that travel while being individually guided by at least two of the second guide bodies. and these second running bodies.
a control device for remotely controlling the first and second traveling bodies; an ultrasonic flaw detection device main body electrically connected to each of the probes; The configuration is equipped with the following.

Effects According to the above configuration, by keeping the second traveling body stationary and causing the first traveling body to travel, it is possible to inspect the welded portion along the circumferential direction. Furthermore, by keeping the first traveling body stationary and avoiding the second traveling body, the welded portion along the axial direction can be inspected. Also, while the first traveling body is traveling, the second traveling body is made to travel at a slow speed, or one of the first traveling bodies is
By causing the second traveling body to travel a predetermined distance for each rotation, the entire chest of the reactor vessel can be inspected. In addition, since at least two second running bodies are provided and a probe is installed on each, the second running body can be divided into one for circumferential inspection and one for axial inspection, allowing for efficient inspection. can be done.

Embodiments Hereinafter, embodiments of the present invention will be explained based on FIGS. 1 to 13.

FIG. 1 is a perspective view of the overall configuration of a reactor vessel body inspection device according to an embodiment of the present invention, in which 31 is a reactor vessel body, 32 is a first guide body, and 33 is a first running member. body, 34a
- 34c are the second guide bodies, 35a, 35b (the second
36 is a η-Jtll installed at a remote location.
board, 37 is the reactor vessel skirt, 38 is the hand hole,
39 is a support cart, 40 is a support ring, 41 is a connecting bar,
42 is a reactor shielding wall, 43 is a hinting ring 11;
Reference numeral 45a denotes a layer imaging device for monitoring installed on one of the second traveling bodies 35a, and 45b denotes a fi5 image device for monitoring installed on the other second traveling body 35b.

Although not shown, a heat insulating material is provided on the inner surface of the reactor enclosure box 42 described in item 11.

As shown in detail in FIGS. 2 and 3, the first guide body 32 consists of an annular rail installed at the step of the reactor shielding wall 42. Above, the first traveling body 33 and a support platform 39 are installed.

The first traveling body 33 includes a truck portion 33a having the same configuration as the support truck 39, and a drive portion 33b that causes the truck portion 33a to travel along the first guide body 32. A plurality (three in this embodiment) are provided at equal intervals in the direction. A plurality of support carts 39 are also provided between the first traveling bodies 33 at regular intervals. The truck portion 33a of the first traveling body 33 and the support truck 33 are each connected to the support ring 40 via the connection bar 41. This support ring 40 has a smaller diameter than the first guide body 32 and is arranged concentrically.

The support ring 40 includes the second guide bodies 34a to 3.
The upper end portions of 4C are connected via brackets 46 at equal intervals in the circumferential direction. Note that this second guide body 34a~
The number of 34c installed is not limited to three.

As shown in detail in FIGS. 4 to 6, the second guide bodies 34a to 34c have lower end portions curved along the outer periphery of the reactor vessel body 31, and lower ends of the second guide members 34a to 34c are curved along the outer periphery of the reactor vessel body 31. It is connected to a bolt 43. The intermediate portion is also connected via brackets 46 to a plurality of intermediate portion support rings 47 similar to approximately two support rings 40 . Sunawamo t'r
IR: A plurality of first running bodies 33 and a plurality of second guide bodies 3
4i1 - 34c are integrally connected, and the second guide bodies 34a to 34 (rotate around the hinting belt 43 as the first running body 33 travels).

As shown in detail in FIGS. 7 to 9, the running body 35a of the tA2 is attached to the second guide body 34a. The drive unit 48 having a pinion that meshes with a rack formed on the guide body 34a is rotated by J5 to rotate the pinion.
The second guide body 34a moves up and down. l) η2 A probe scanning device 49 is fixed to the second traveling body 35a, and this probe scanning device 49 is attached to the second guiding body 34a at the upper end thereof. A box body 51 to which a guide frame 50 is attached, a threaded rod 52 installed inside this box body 51, a rotary drive device 53 that rotates this threaded rod 52 around its axis, and a guide rod 54. It is comprised of two sets of probe boxes 55, each having a threaded portion 55a that is screwed onto the threaded rod 52 and loosely fitted onto the guide rod 54. A probe 56 is installed in each probe box 55. The threaded rods 52 have threads in opposite directions with the axial center as a boundary rod, and when the threaded rods 52 are rotated, the two sets of probes w155 move in opposite directions. Note that 57 is a rack.

11 U2 The second guide body 34b has the
As shown in detail in the figure, the second traveling body 35b is attached, and this second traveling body 35b has a drive portion 58 having a pinion that meshes with a rack formed on the second guide body 34b. The rotation of the pinion causes the second
It moves up and down along the guide body 34b.

A probe scanning device 59 is attached to the second traveling body 35b, and this probe scanning device 59 is connected to the second traveling body 35b.
perpendicular to the guide body 34b of the reactor vessel ffJ section 3.
a scanning guide 60 curved along the outer periphery of the scanning guide 60; a scanning drive device 62 having a pinion that meshes with a rack 61 formed on the scanning guide 60; and a probe box 63, in which a probe 64 is installed. Note that 65 is a rack.

Furthermore, as shown in FIG. 1, the second traveling bodies 35a, 35b have image carrier devices 45a, 45b mounted thereon, and these imaging devices 45a, 45b are equipped with a television camera and a lighting device. It consists of equipment. 1 to the control panel 36, the drive section 33 of the first traveling body 33;
b, I)fj, the drive unit of the second traveling bodies 35a, 35b, 18.58g, the rotational drive device allowance 53 and the scanning drive device 62 of the probe scanning device 49.50, and the Ha
remote control of the devices 45a and 45b;
In addition to the Jill device installed therein, the main body of the Zhaohebo flaw detection device electrically connected to each of the probes 56 and 64 is also installed, and furthermore, the imaging device 4! +a, 4
A display device for displaying the image carried by 5b, f-
F-Record J! is equipped with an f-recording device with a typewriter, a typewriter, a disk, a magnetic disk, etc., and a computer! l! equipment is installed. Note that the second traveling body is not attached to the second guide body 34c. Further, the second running bodies 35a, 35b are normally the second guide bodies 34a.

34b, and is inserted through the hand hole 38 of the reactor vessel skirt 37 at the start of inspection and attached to the second guide bodies 34a, 34b.

Hereinafter, the effects of the above configuration will be explained.

First, when inspecting a welded portion along the circumferential direction, the second traveling body 35a is caused to travel so that the central portion of the threaded rod 52 in the axial direction is opposed to the weld line. Then, while the first traveling body 33 is running at a predetermined speed, the threaded rod 52 is reciprocated at a predetermined speed and at a predetermined number of revolutions. As a result, the transmitting and receiving probes 56 and 56 move back and forth in opposite directions with the welding line as a boundary, and scan a predetermined range as shown in Fig. 1 Actual IQ (A>).Next, When inspecting a welded part along the axial direction, the first traveling body 33 is run and the second
The traveling body 35b is placed opposite to the welding line. Then, while the second traveling body 35b is traveling at a predetermined speed in a predetermined direction, the scanning drive device 62 is reciprocated at a predetermined speed.

Thereby, the probe 64 scans a predetermined range as shown by the solid line (B) in FIG. 1 with the weld line as the center. In addition, by inspecting the welded portion along the circumferential direction and using the company's method, the position of the second traveling body 35a is adjusted to correspond to the scanning range of the probe 56 for each rotation of the first traveling body 33. By gradually increasing the distance C, the entire outer peripheral surface of the reactor vessel body 31 can be inspected.

In these inspections, the signals from the probes 56 and 64 are input to the main body of the ultrasonic deep mountain equipment in the control panel 36, and at the same time, the inspection data is processed and recorded.
By displaying the images from 5a and 45b, the status of the probes 56 and 64W during inspection and the status of the flaw detection surface can be observed by remote control. , and a layer imager 45a.

In addition to his early childhood, 45b was also involved in the IH section 3 of the nuclear reactor'fg reactor.
It is used for visual inspection of the outer peripheral surface of 1.

As described above, according to this embodiment, the second guide bodies 34a to 3
Since 4c rotates, it is easy to move up to track 36M4.
Therefore, it is easy to control the drive operation. Moreover, since flaw detection scanning can be performed not only on the welded portion but also over the entire area of the reactor vessel body 31, defects such as the base metal itself, the inner surface of the clad, the base metal-clad welded portion, etc. can also be detected. In particular, the standards require that the inner surface of the reactor vessel, that is, the inner surface of the cladding, be inspected with the naked eye if possible at the time of fuel exchange, etc., but the inspection bag U of this embodiment can be used as an alternative method. In addition, since detection inspections can be performed remotely and automatically, they can be carried out in parallel with fuel replacement and other maintenance and inspection work, reducing the period of inspection during service life. Also, for on-site work, the second guide 3
Since only the setting of the second traveling bodies 35a, 35b to 4a, 34b is required, it is effective in reducing the radiation exposure of the workers.

In the above embodiment, the tandem flaw detection method was used to inspect the welded portion along the circumferential direction, but the -probe method may also be used. That is, as shown in FIG. 12 and FIG.
Scanning traveling body 68 having a guide frame 67 that loosely fits into 4a
, a scanning drive i11 device 70 equipped with a pinion that meshes with a rack 69 formed on the scanning traveling body 68 and installed on the second traveling body 35a, and the scanning traveling body 68
A probe box 71 is attached to the lower end of the probe box 71, and a probe 72 is housed within the probe box 71. Note that instead of this, a driving configuration as shown in FIGS. 10 and 11 may be used. )The scanning guide body 60 may be made parallel to the second guide body 35a.

Further, in the above embodiment, the probes 56, 64, and 72 were scanned over a predetermined range, but depending on the characteristics of the probes or the inspection accuracy, it is not necessary to scan them.

Effects of the Invention As described above, according to the present invention, since the second guide body itself rotates, the construction is simple and the drive operation is easy to control. Inspection can be performed over the entire 2g circular portion. Also the second
Since at least two guide bodies and second traveling bodies are provided, inspections along the circumferential direction and inspections along the axial direction can be performed with dedicated probes, respectively. Therefore, for example, during one inspection Inspection can be carried out efficiently, such as by being able to align the heightwise position of the other second traveling body with the starting position of the other second traveling body. In addition, since flaw detection can be performed remotely and automatically, it can be carried out in parallel with fuel changes and other maintenance and inspection work.
The overall inspection period is greatly shortened, and at the same time, there is almost no on-site work, which greatly reduces radiation exposure for workers.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing the overall configuration of a reactor vessel barrel inspection device according to an embodiment of the present invention, FIG. 2 is a plan view of the vicinity of the first guide body in the inspection device, and FIG. 4 is a perspective view of the vicinity of the second guide body I1 in the inspection M device, FIG. 5 is an enlarged cross-sectional view of the same essential part, and FIG.
The figure is an enlarged longitudinal cross-sectional view of the same essential part, Fig. 7 is a perspective view of the vicinity of one of the second traveling bodies in the same inspection device, Fig. 8 is an enlarged cross-sectional view of the same essential part, and Fig. 9 is a probe. A vertical sectional view of the box, FIG. 10 is a front view of the vicinity of the other second traveling body, FIG. 11 is an enlarged cross-sectional view of the same essential part, and FIG. 12 is one of the second traveling bodies in another embodiment.
FIG. 13 is an enlarged cross-sectional view of the same main part, FIG. 14 is an ItIIIi plane view of the conventional device, and FIG. 15 is a partially cutaway perspective view of another conventional device. 31... Reactor vessel body, 32... First guide body,
33...First running body, 34a to 34C...Second guide body, 35a. 35b...Second running body, 36...It/J immediate release,
56, 64.72... Probe beden! Figure 4Figure 7Figure 10Figure 1IFigure IFigure 12Figure 114 FactorsFigure 15

Claims (1)

[Claims] 1. An annular first guide body installed along the circumferential direction near the outer circumferential surface of the reactor vessel body, a first traveling body that runs guided by the first guide body, and the atoms a plurality of second guide bodies arranged near the outer circumferential surface of the reactor vessel body along the axial direction at appropriate intervals in the circumferential direction and connected to the first running body; at least two sets of second running bodies that run while being guided separately by at least two of the second guide bodies, probes installed on each of these second running bodies, and the first and second running bodies; An inspection device for a nuclear reactor vessel body, comprising: a control device for remotely controlling a second traveling body; and an ultrasonic flaw detection device main body electrically connected to each of the probes.