JPH08146185A - Appearance inspecting device for fuel assembly - Google Patents

Abstract

PURPOSE: To easily make possible discrimination between projecting and recessed parts on the surface of fuel by stereoscopically viewing the photographing image of a fuel assembly. CONSTITUTION: Two underwater television cameras 2, 3 arranged side by side at a space about 60-70mm are synchronized and rotated in such a manner that the focus is adjusted on one point of the side of a fuel assembly N. Two images of photographing the same part of the fuel assembly N can be obtained in a place to which the middle point O of two underwater television cameras 2, 3 is extended toward the fuel assembly N. These two images are separately seen with a right eye and a left eye by using a stereoscope, whereby the images can be taken as one stereoscopic image. For example, an image photographed by the right camera 3 is projected in red on a cathode-ray tube, and an image photographed by the left camera 2 is projected in blue. If the projected images are seen with a pair of spectacles having a red left eye lens and a blue right eye lens, the images can be taken as a stereoscopic image.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a visual inspection apparatus for nuclear fuel assemblies, and more particularly to a visual inspection apparatus for stereoscopically viewing an image of an underwater television camera.

[0002]

2. Description of the Related Art A nuclear fuel assembly is inspected for its soundness before the irradiation spent fuel is reloaded into the reactor and reused.
It is necessary to confirm whether it can be reused. For that purpose, various periodic inspections are performed to check the soundness of each constituent member constituting the assembly, such as a leakage inspection, each fuel rod gap of the assembly, the soundness of each fuel support grid, and the bending of the assembly. , Detection devices such as various sensors are used, and the detection data are sent to the recording devices for visual inspection and measurement.

As such a conventional visual inspection device, one having a control device, a camera vertical movement device, a display device, an underwater television camera, a VTR and a CRT (monitor television) is generally used. Drive command to position the underwater television camera, and this television camera is activated later, and all of its video signals are V
It was recorded on TR, that is, on a video tape, and was displayed on the CRT screen. On the other hand, drive information of the camera vertical movement device, for example, fuel assembly number, camera position, time, etc., is displayed on the display device so that the operator can grasp it.

On the other hand, the underwater television camera, which is one of the main parts of the appearance inspection apparatus, is often used as a set of two underwater television cameras having parallel fields of view. This is because the lateral dimension of the fuel assembly is large compared to the field of view of the underwater television camera, and the side surface of the fuel assembly cannot be covered with one television camera. Normally, the entire lateral surface of the fuel assembly is photographed on the screens of the two underwater television cameras, and the entire one side surface of the assembly is searched by moving up and down the two underwater television cameras.

To observe the four sides of the fuel assembly, the fuel assembly is often rotated every 90 °. Further, since a detailed observation is performed using a zoom device attached to the underwater television camera when necessary, the pedestal of the underwater television camera is often slidable in the lateral direction.

[0006]

By the way, at present, in the visual inspection of the fuel assembly, more advanced inspection such as colorization of an image is required due to long-term combustion of the fuel assembly.

However, in the current appearance inspection apparatus,
The image was taken only from the front of the side surface of the fuel assembly, and it was not easy to identify the unevenness of the fuel surface. In some cases, it may not be possible to clearly discriminate whether or not it is a concave state due to peeling of the layer, and such inspection of the fuel surface state has often relied on previous experience.

It is an object of the present invention to deal with the above-mentioned actual situation and to make it possible to stereoscopically view a photographed image of a fuel so that the unevenness of the fuel surface can be easily discriminated.

[0009]

That is, a feature of the appearance inspection apparatus of the present invention which meets the above-mentioned object is, first, that it has two underwater television cameras arranged side by side with a predetermined interval. That is, the field of view of the two underwater television cameras is set so that the same part of the subject is photographed.

A feature of the second appearance inspection apparatus of the present invention is that it is provided with a single underwater television camera, and two sets are provided in front of the underwater television camera side by side with a predetermined interval left and right. The prisms are arranged, and by combining these prisms with the underwater television camera, the same part of the subject is photographed from two different angles.

Further, in the third appearance inspection apparatus of the present invention, a single underwater television camera is provided slidably to the left and right at predetermined intervals, and the same portion of the subject is photographed at each of the left and right slid positions. It is characterized in that the underwater television camera can be swung freely.

[0012]

With the first device of the present invention, it is possible to simultaneously obtain two images of the same portion photographed from different angles. Also, with the second and third devices of the present invention, it is possible to obtain two images of the same location, which are also taken from different angles, by recording on a VTR or the like.

By viewing the above two images separately for the right eye and the left eye, for example, using a stereoscopic mirror, these can be regarded as one stereoscopic image.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view showing an appearance inspection apparatus according to the first embodiment of the present invention. This apparatus has two lenses 1 whose centers are arranged side by side at an interval of about 60 to 70 mm. It is equipped with underwater television cameras 2 and 3. The two underwater television cameras 2 and 3 are attached to the camera mount 4 via a rotary shaft 5, and the rotary shaft 5 can be remotely operated.
It is possible to rotate in the horizontal direction around. That is, as shown in FIG. 2, if the two underwater television cameras 2 and 3 are synchronized and are rotated so as to be in focus at one point on the side surface of the fuel assembly N, the two underwater television cameras 2 will be synchronized. , 3 at the midpoint O extending toward the fuel assembly N,
Two images of the same part of the fuel assembly can be obtained.

On the other hand, what is shown in FIGS. 3A and 3B is an appearance inspection apparatus according to the second embodiment of the present invention. This apparatus is provided for one underwater television camera 6 which is slidable right and left. Two sets of prisms 7 and 8 which are arranged side by side at an interval of about 60 to 70 mm on the left and right are arranged in the front. These prisms 7 and 8 are, as shown in FIGS.
When the underwater television camera 6 is located behind each,
The field of view of the underwater television camera 6 is bent so that the same portion of the fuel assembly N can be photographed from two different angles.

In the prisms 7 and 8, by slightly changing the bending angle, only the prisms 7 and 8 are moved instead of the underwater television camera 6, and the same portion of the fuel assembly N is moved from two different angles. It is also possible to make it shoot.

On the other hand, FIG. 4 is a plan view showing a third embodiment of the present invention. In this apparatus, one underwater television camera 9 is also arranged on the left and right at a distance of about 60 to 70 mm between lenses. The underwater television camera 9 is swingable so that the same portion of the fuel assembly N can be photographed at the slid position as shown in the drawing.

Incidentally, in each of the embodiments described above, an elevating device for elevating and lowering each underwater television camera, a VTR, a monitor television, a control device and the like are attached in the same manner as the conventional visual inspection device.

However, in the apparatus of the first embodiment, it is possible to obtain two images of the same place photographed from different angles at the same time, or by recording on the VTR in the second and third embodiments. Is.

Then, these two images are displayed, for example, in FIG.
As shown in, the screen or cathode-ray tube 10 shows what is taken by the right TV camera in red, while the one taken by the left TV camera is shown in blue and is slightly left-shifted from the red image. A stereoscopic image can be obtained by viewing with a red eye lens and a blue eye lens for the right eye lens.

Further, as shown in FIG. 6, the image taken by the left TV camera is used for the left screen or the cathode ray tube 11.
The image captured by the right TV camera is displayed on the right screen or the cathode ray tube 12. By providing a partition 13 between them so that only the right image can be seen by the right eye and only the left image can be seen by the left eye, the above two images can be viewed as a standing image. .

Next, a method of measuring the depth of a recess or the like using the apparatus of the present invention will be described with reference to FIG. When the distance D between the left and right TV cameras and the subject is sufficiently larger than the distances L and R between A and B reflected on the left and right TV cameras, the difference d between the depths of the points A and B is d It is expressed by the following equation:

[0024]

[Equation 1]

At this time, if L> R, point A is farther than point B, that is, concave. In addition, the angle θ is calculated from D and m by the following formula / equation 2.

[0026]

[Equation 2]

L and R are the distance between each TV camera and the subject.

[0028]

(Equation 3) It can be easily obtained from the AB distance on the screen and the camera magnification. Alternatively, it may be obtained by attaching a ruler to the surface of the subject and comparing it with the ruler.

If θ = 30 °, d = │LR│, θ =
If it is 10 °, d≈2.88 × | L−R |, so that the measurement accuracy of the depth d is almost equal to the measurement accuracy of L and R.

The embodiment of the present invention has been described above. The apparatus of the present invention, for example, is provided with another unit shown in FIG. It is also possible to observe the surface of various furnace interior luggage such as a burnable poisonous substance aggregate as a subject.

Further, in the apparatus of the first embodiment of the present invention, instead of rotating the underwater television cameras 2 and 3, the underwater television cameras 2 and 2 having parallel fields of view are provided with prisms having a bending ratio for photographing the same portion. It is also possible to movably provide in front of 3.

[0032]

As described above, the visual inspection apparatus for a fuel assembly according to the present invention is capable of shooting the same portion of a subject with an underwater television camera from two different angles. By viewing these two images with the left and right eyes with a predetermined means, it is possible to capture them as one stereoscopic image, and it was not possible to clearly discriminate whether adhered matter or grinding in the conventional visual inspection. The discolored portion can be easily discriminated by checking the unevenness, and this has a remarkable effect that the soundness of the fuel assembly can be more easily inspected.

[Brief description of drawings]

FIG. 1 is a perspective view showing an appearance inspection apparatus according to a first embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3A is a plan view showing an appearance inspection apparatus according to a second embodiment of the present invention. (B) It is a plan view showing an appearance inspection apparatus of the second embodiment of the present invention.

FIG. 4 is a plan view showing an appearance inspection apparatus according to a third embodiment of the present invention.

FIG. 5 is a diagram showing an example of a method for stereoscopically viewing an image obtained by the device of the present invention.

FIG. 6 is a diagram showing another example of a method for stereoscopically viewing an image obtained by the device of the present invention.

FIG. 7 is a diagram for explaining a method of measuring the depth of a recess or the like using the device of the present invention.

[Explanation of symbols]

 1 Lens 2,3 Underwater TV Camera 4 Camera Mount 5 Rotation Axis 6 Underwater TV Camera 7,8 Prism 9 Underwater TV Camera 10,11,12 Screen or CRT 13 Partition N N Fuel Assembly O Midpoint

Claims (3)

[Claims] 1. An underwater television camera provided with two underwater television cameras arranged side by side at a predetermined interval, and the camera fields of view of the two underwater television cameras are set so as to photograph the same portion of a subject. A visual inspection device for a fuel assembly. 2. A single underwater television camera is provided, and two sets of prisms are provided in front of the underwater television camera and are juxtaposed at right and left at predetermined intervals. By combining a TV camera,
A visual inspection apparatus for a fuel assembly, wherein the same portion of a subject is photographed from two different angles. 3. A single underwater television camera is provided slidably to the left and right at predetermined intervals, and the underwater television camera can be swung freely so that the same portion of the subject is photographed at the left and right sliding positions. A visual inspection apparatus for a fuel assembly, which is characterized in that