JPH09189792A - Visual inspection device for control rod cluster assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To test the whole circumference over the entire length of a control rod in a short time in a visual inspection on a control rod cluster assembly(RCCA). SOLUTION: This inspection device includes a base shaped like a horizontal plane and television cameras 2 placed near the outer circumference of the base. In the center of the base, there are guide holes 4 where each rod 3 of a control rod cluster assembly(RCCA) is inserted. Then, the circumference of one of the guide holes 4 is quartered circumferentially, a mirror 5 is installed at the front of each quartered part and the angle of the mirror 5 is set so that the visual field of a camera can cover the quartered parts located back to back.

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 a control rod cluster assembly (hereinafter referred to as RCCA).

[0002]

2. Description of the Related Art As an apparatus for inspecting the appearance of RCCA, there is currently an apparatus for inspecting only the outer surface side of an outer rod or an inner rod with a television camera by rotating the RCCA while suspending it with a dedicated handling tool.

However, RCCA after using the actual machine is
It is said that the inner rod is environmentally stricter than the outer one, and the inner rod may be damaged earlier. It is not possible to confirm the inner side of each.

EC as another inspection device of RCCA
There are some that use a T-coil, but this is mainly for flaw detection, and the inspection time is long, and it is impossible to cope with the shortened regular inspection in the near future, and it is difficult to adjust and costly. Have

[0005]

DISCLOSURE OF THE INVENTION The present invention deals with the above-mentioned actual situation and makes the appearance of RCCA over the entire circumference of all rods,
The purpose is to easily inspect from the tip to the upper part of the plenum in a short time.

[0006]

That is, a feature of the appearance inspection apparatus of the present invention which meets the above-mentioned object is that it has a horizontal plate-shaped base having a plurality of guide holes in the center for inserting RCCA rods. , Comprising a plurality of TV cameras arranged in the vicinity of the outer periphery of this base, and dividing the circumference of any guide hole into four in the circumferential direction, and arranging a mirror in front of each divided portion, The angle of the mirror is set so that the divided parts facing each other are within the field of view of one camera.

Further, in the appearance inspection apparatus of the present invention, the bases are formed in upper and lower two steps, and the mirrors are installed in approximately half of the guide holes in the outer periphery of one base and the other base is installed. It is also possible to install the above-mentioned mirrors in approximately half of the guide holes in the inner peripheral portion of the table and arrange the guide holes having the upper and lower two stages of mirrors in the same number or more and in point symmetry with respect to the guide holes without mirrors. It is possible.

[0008]

In the appearance inspection apparatus of the present invention, the RCCA is hung from above and the appearance is inspected by the television camera while inserting the rod into the guide hole of the base. In this case, since a mirror that reflects in all directions is arranged around the rod, it is possible to inspect the entire circumference of the rod, and images in four directions can be viewed with two TV cameras. Since this can be covered, the inspection device can be made compact and low cost. Further, by arranging the base in two steps, the space for the mirror and the TV camera can be effectively used, and the guide hole with the mirror and the guide hole without the mirror are formed point-symmetrically. , RCC
By rotating A by 180 ° and inserting it into the base twice, it becomes possible to perform visual inspection of all rods.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall view showing an RCCA appearance inspection apparatus according to an embodiment of the present invention, FIG. 2 is a plan view showing an upper base of the apparatus, and FIG. 3 is a plan view showing the same lower base.

The inspection apparatus of the above-mentioned embodiment has 24 rods 3
Is for RCCA and is provided with horizontal plate-shaped bases 1a and 1b formed in upper and lower two stages as shown in FIG. 1, and a total of the bases 1a and 1b disposed near the outer peripheries of the bases 1a and 1b, respectively. It is provided with 24 TV cameras 2. Above and below base 1
As shown in FIGS. 2 and 3, 24 guide holes 4 into which the RCCA rod 3 is inserted are formed in the central portions of a and 1b, respectively.

As shown in FIGS. 2 and 3, the guide hole is divided into four equal parts in the circumferential direction, as shown in FIGS.
The mirrors 5 are arranged in front of the respective divisions, and the angle of the mirrors 5 is set to 45 ° with respect to the tangent of the fronts of the divisions so that the back-to-back divisions fit within the field of view of one camera. ing.

Then, in the two-stage bases 1a and 1b, as shown in FIG. 2, the mirror 5 and the television camera 2 are installed in approximately half of the guide holes 4 on the outer periphery of the base 1a. As shown in FIG. 3, in the lower base 1b, a mirror 5 and a television camera 2 are also provided in a guide hole 4 in approximately half of the inner peripheral portion.
Are installed, and the guide hole 4 having a mirror formed by the upper and lower bases 1a and 1b is arranged point-symmetrically with respect to the guide hole 4 having no mirror as shown in FIGS. . The total number of guide holes 4 having the above-mentioned mirrors is the same as that of the guide holes 4 having no mirror.

For this reason, the television camera has an upper base 1a.
14 units (only one unit is shown in Fig. 2), 1 unit on the lower base 1b
0 units (only one unit is shown in FIG. 3) are installed. In addition, by using the frame switcher 6 capable of multiple-recording images from the camera 2 for a maximum of eight units, two monitors and two videos are provided for the upper base 1a and the lower base 1b.
Two units are arranged for each, but bases 1a, 1
If you do not divide b, the above monitors and videos can be covered by 3 units each. In addition, 7 shown in FIG. 1 is an RCCA handling tool holding mount, has a structure to be fitted with the guide pin 8a of the RCCA handling tool outer cylinder 8, and has a cluster-shaped hole through which the RCCA spider portion 9 is inserted. Have ten.

In the inspection apparatus of the above embodiment, the upper and lower bases 1a and 1b and the RCCA handling tool holding base 7 are first mounted on the spent fuel storage rack 11 in the spent fuel pool by a crane. Install as shown in 1.
As for the preparation before the inspection, all that is left is to process the cable and check the image.

To start the inspection, first, the RCCA 12 is hung by its handling tool, and the guide pin 8 at the lower end of the tool outer cylinder 8 is suspended.
Positioning with respect to the holding frame 7 is performed by a. After that, while lowering the RCCA, the bases 1a and 1b are simultaneously inspected.

The ascending / descending speed at the time of inspection is about 3 m / min. It should be noted that, as shown in FIG. 2 and FIG.
Since only half the rods 3 of CA 12 can be inspected, RCCA 12 is rotated 180 ° and reinserted after extraction.
In order to perform this process, it is possible to inspect in about 9 minutes per RCCA (excluding the horizontal movement time of the handling tool, latching and unlatching time), and the total inspection of RCCA of one core is completed in about 1 day. It is possible to

Since one television camera 2 photographs the two surfaces of the rod 3, the image is divided into left and right on the monitor screen as shown in FIG. Further, when it is difficult to perform a visual inspection in real time at the same time when the RCCA is moved up and down, when the number of rods per RCCA is large, the inspection is performed only by reproducing the VTR.

[0018]

As described above, the RCCA of the present invention is used.
The visual inspection apparatus of 1 is equipped with a horizontal plate-shaped base having a plurality of guide holes into which the RCCA rods are respectively inserted and which is inserted in the center, and a plurality of TV cameras arranged near the outer periphery of the base. , The circumference of any guide hole is divided into four in the circumferential direction, and a mirror is arranged in front of each divided part,
The angles of the mirrors are set so that the divided parts facing each other fit within the field of view of one camera, and since mirrors that project from all sides are arranged around the rod, the plenum part from the tip end is arranged. The entire circumference of the rod can be visually inspected, and four TV images can be covered by two TV cameras, so that the inspection device can be made compact and low cost. And since there is no mechanical part in the underwater part, the failure frequency is low, installation and adjustment are easy, inexpensive and quick inspection can be performed, and it is possible to sufficiently respond even after shortening the regular inspection process. It plays. Further, by arranging the base in two steps, the space for the mirror and the TV camera can be effectively utilized, and the guide hole having the mirror and the guide hole having no mirror are formed point-symmetrically. , RCCA can be rotated 180 ° and inserted into the base twice to perform visual inspection of all rods.

[Brief description of the drawings]

FIG. 1 is an overall view showing an RCCA appearance inspection apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view showing an upper base of the apparatus.

FIG. 3 is a plan view showing the lower base of the same.

FIG. 4 is an explanatory diagram showing an example of a monitor screen.

[Explanation of symbols]

 1a Upper base 1b Lower base 2 Television camera 3 Rod 4 Guide hole 5 Mirror 6 Frame switcher 7 RCCA handling tool holding frame 8 RCCA handling tool 8a Guide pin 9 Spider part 10 Hole 11 Spent fuel storage rack 12 RCCA

Claims (2)

[Claims] 1. A horizontal plate-shaped base having a plurality of guide holes into which the rods of the control rod cluster assembly are respectively inserted, and a plurality of television cameras arranged near the outer periphery of the base. In addition, the circumference of an arbitrary guide hole is divided into four parts in the circumferential direction, a mirror is arranged in front of each divided part, and the divided parts facing back are included in one camera's visual field. A visual inspection apparatus for a control rod cluster assembly, characterized in that a mirror angle is set. 2. The base is formed in upper and lower two stages, one of the bases is provided with the mirrors in guide holes of approximately half of the outer peripheral portion, and the other base is provided with almost half of the inner peripheral portion. 2. The control rod cluster assembly according to claim 1, wherein the mirrors are installed in the guide holes, and the guide holes having the upper and lower two stages of mirrors are arranged in a point symmetry in the same number or more with respect to the guide holes without mirrors. Appearance inspection device.