JPS6318702B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a track cable guide device for an automatic ultrasonic flaw detection device for a pressure vessel body used in a nuclear power plant or the like.

Conventionally, when performing in-service inspections (hereinafter referred to as ISI) of reactor pressure vessel fuselage welds, vertical tracks for automatic ultrasonic flaw detection equipment were installed on the fuselage vertical welds to perform flaw detection. Flaw detection of the circumferential weld was not performed. Therefore, there was no need to specially guide the cable of the automatic ultrasonic flaw detection device.

However, the standards require ISI to be performed on the welded parts of the reactor pressure vessel body, and circumferential welded parts also need to be inspected by setting up a circumferential track. Therefore,
A circumferential orbit was installed along the welded part of the reactor pressure vessel body, and ISI was also performed in the circumferential direction. However, when an automatic ultrasonic flaw detection device runs in orbit, the cable of the device may hang down, or
If the device stops working due to some kind of problem,
When recovering the device, a problem has arisen in that since the cable does not bend at the turntable, the device cannot be pulled closer using the cable, making it difficult to recover.

The present invention allows automatic ultrasonic flaw detection equipment to move from vertical orbit to circumferential orbit (or from circumferential orbit to vertical orbit).
The purpose is to guide the cable so that it does not sag when traveling on a circumferential orbit, and to ensure that the device can be safely recovered in the unlikely event that a problem occurs.

In order to meet the above object, the present invention is characterized in that a cable guide device is provided near the intersection of the two tracks.

FIG. 1 shows an overall view of the reactor pressure vessel and the track for automatic ultrasonic flaw detection equipment.

In the figure, a reactor pressure vessel trunk heat insulating material 2 and a γ-shield 3 for shielding radiation from the reactor are installed around a reactor pressure vessel 1.
Further, along the welded portion 11 of the container 1, there is a circumferential track 4 for the automatic ultrasonic flaw detection device along which the automatic ultrasonic flaw detection device runs.
and vertical track 5 are installed.

FIG. 2 shows a diagram in which the automatic ultrasonic flaw detection device 6 is traveling on the vertical track 5.

In the figure, the automatic ultrasonic flaw detection device 6 is traveling upward from the lower end of the vertical track 5, and a turntable 7 is used to change the direction of the flaw detection device 6 at the intersection of the circumferential track 4 and the vertical track 5. It is about to move to orbit 4. On turntable 7,
When the device 6 travels on the circumferential track 4, a counterclockwise cable guide device 8 and a clockwise cable guide device 9 are provided for guiding the cable 10 of the device 6. The cable guide devices 8 and 9 rotate together with the turntable 7.

FIG. 3 shows a left side view of the intersection of the vertical orbit 5 and the circumferential orbit 4 in FIG. 2.

As shown in the figure, cable guide devices 9 and 8
is between the orbit and the pressure vessel 1. Since a side plate 13 is provided on the pressure vessel side of the cable guide device, the cable 10 will not come off even if some external force is applied to it.

FIG. 4 shows a state in which the device 6 is running counterclockwise after the turntable 7 changes direction and moves to the orbit 4. FIG.

In the figure, by applying a certain amount of tensile force to the cable 10 via the counterclockwise cable guide device 8, the cable 10 will not hang down when the device 6 travels on the circumferential track 4.

In this embodiment, if the device 6 stops moving for some reason while traveling on the circumferential track 4, the cable 10 can be pulled through the counterclockwise cable guide device 8. The device 6 is dragged by the cable 10 to the turntable 7, where it is turned around and transferred to the longitudinal track 5, and can be retrieved by pulling the cable 10 further.

FIG. 5 is a diagram showing a clockwise running state after the device 6 changes direction by the turntable 7 and moves to the circumferential orbit 4, similarly to FIG. 4.
In this case, the clockwise cable guide device 9
The same effect as turning counterclockwise can be obtained. Therefore, device 6
The cable 10 is held and constantly guided by a cable guiding device 8 or 9 when the device 6 is transferred from the longitudinal track 5 to the circumferential track 4.

In the embodiment described above, the cable guide device is provided with two cable guides on the underside of the turntable 7, as shown in FIG.
As shown in FIG.
2. An upper shared cable guide device 16 may be provided, and each cable guide device may be structured to be movable left and right independently of the turntable 7.

Further, as shown in FIG. 7, a cable guide device similar to the cable guide device shown in FIG.
It may be provided as an upper clockwise cable guide device 15. In this case, the cable 10 can be guided by a cable guiding device when the device 6 transitions from both the upper end and the lower end of the longitudinal track 5 to the circumferential track 4 .

As described above, according to the present invention, when an automatic ultrasonic flaw detection device runs in a circumferential orbit, it is possible to guide the cable so that it does not hang down, and even if the device should have trouble, Can be safely recovered.

[Brief explanation of the drawing]

FIG. 1 is an overall view of the reactor pressure vessel and the track for automatic ultrasonic flaw detection equipment. Figures 2 to 5 show an embodiment of the present invention, in which Figure 2 is a front view of the vicinity of the track intersection, Figure 3 is a left side view, and Figure 4 is a left side view.
Figure 5 is a diagram showing the device running on a circumferential orbit.
FIG. 6 and FIG. 7 are diagrams showing other embodiments. 4... Circumferential orbit for ultrasonic flaw detection equipment, 5... Vertical track for ultrasonic flaw detection equipment, 6... Automatic ultrasonic flaw detection equipment,
7... Turntable, 8, 9... Cable guide device, 10... Cable.

Claims (1)

[Scope of Claims] 1. An automatic ultrasonic flaw detector having a longitudinal track and a circumferential track along the fuselage welding line of a reactor pressure vessel, and having a turntable at the intersection of both tracks to change the direction of an automatic ultrasonic flaw detection device. A cable guide device for a track for an automatic ultrasonic flaw detector, characterized in that a cable guide mechanism for guiding a cable of the automatic ultrasonic flaw detector is provided near an intersection of both tracks in the track for a sonic flaw detector. 2. The cable guide device for a track for an automatic ultrasonic flaw detector according to claim 1, wherein the cable guide mechanism is a support rod provided on the turntable.