JPH0213744B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to nuclear reactor equipment, and in particular, an ultrasonic flaw detection device for a welded part of a reactor pressure vessel that runs on a track provided on the outer periphery of the reactor pressure vessel. This invention relates to the improvement of nuclear reactor equipment equipped with an emergency recovery function, such as a drive device for moving the reactor.

The reactor pressure vessel is made by welding, so in order to inspect the welds, a track as shown in Figure 1 is placed around the reactor pressure vessel, and an automatic superstructure is placed on this track. A driving device 5 for the sonic flaw detection device is installed, and inspection is performed while moving the automatic ultrasonic flaw detection device along a track.

The aforementioned orbit consists of a vertical longitudinal orbit 1 and a horizontal arc-shaped circumferential orbit 2 surrounding the reactor pressure vessel,
A turntable 3, which is a transfer means for the drive device 5, is provided at the intersection of the two tracks 1 and 2.

A wire 4 is attached to the drive device 5 for emergency recovery to pull the drive device 5 back if it stops moving on the orbit.

As shown in FIG. 1, the conventional emergency recovery method for the drive device 5 of an automatic ultrasonic flaw detection device is to pull the wire 4 attached to the drive device 5 that has stopped on the orbit. It was done by doing this. In this method, if the drive device 5 stops on the circumferential track 2, even if the wire 4 is pulled from above, force will act on the drive device diagonally.
The drive device 5 has the disadvantage that it is difficult to move and cannot be recovered.

Furthermore, in the idea of FIG. 2, a guide roller 9a is integrally attached to the corner of the turntable 3 in the configuration of FIG. 1, and the wire 4 is connected to the guide roller 9a.
The drive device on the circumferential orbit is thereby moved.

In the emergency recovery method in the case of FIG. 2, the wire 4 is nearly parallel to the circumferential track 2, so that the pulling operation can be carried out smoothly. However, in order to prevent the arm 5a of the drive device 5 from coming into contact with the roller 9a, the roller 9a needs to be installed far away from the turntable 3 as shown in FIG. Considering the narrow space between the pressure vessel 20 and the orbits 1 and 2 that surround it, and the curvature of the reactor pressure vessel and the circumferential orbit 2, the roller 9a rotating integrally with the turntable 3 has a narrow space between the circumferential orbits 1 and 2. There is a risk of contact with the turntable 9.
There is a limit to how far away it can be installed. (In the figure, 21 indicates a heat insulating material.) That is, when the turntable 3 rotates in order to transfer the drive device from the circumferential orbit to the vertical orbit, the guide roller attached to the turntable also rotates at that time. Therefore, if the guide roller arm is lengthened,
There is a risk that the guide roller will come into contact with the circumferential track.
In addition, since the drive unit itself runs on a vertical track and a circumferential track, most of the space where the turntable is located is occupied by the drive unit, so it is necessary to secure space for installing the guide rollers in this area. is difficult in practice.

The present invention improves the shortcomings of the prior art as described above, by turning guide rollers to give the tension wire a tension direction along the same direction for moving the drive device on the circumferential track. To provide equipment in which a guide roller can be placed at a location away from a table part.

The present invention includes a nuclear reactor pressure vessel and a heat insulating material disposed around the outer periphery of the reactor pressure vessel,
It consists of a vertical track, a circumferential track, and a transfer means between these tracks, which are provided around the pressure vessel in the space, and has a track for running and moving a drive device, and a wire attached to the drive device. In nuclear reactor equipment provided with a means for moving the drive device on a circumferential track by pulling it through a guide roller, there is provided a bogie that can run on the vertical track and stop at an appropriate location. The trolley is further provided with a bar having guide rollers for guiding the wire.

The present invention will be explained below using examples.

In this embodiment, as in the conventional case, a vertical track 1 and a circumferential track 2 are provided around the reactor pressure vessel, as shown in Fig. 3, and a turntable 3 installed at the intersection of both tracks automatically The driving device 5 of the ultrasonic flaw detection device can be transferred thereto. A rack 17 is provided on each of these tracks 1 and 2, as shown in FIG. 4, so that the drive device 5 can run by meshing with each other.

As shown in FIG. 4, the bogie 10 is equipped with track rollers 16 having a V-shaped track contact surface, and these track rollers 16 sandwich the sides of the vertical track 1 to prevent the bogie from leaving the track. ing. The movement of the trolley is driven by a separate drive source,
It can also be done manually using a wire or the like.

One end of the bar 8 is mounted on the truck 10 so as to be rotatable about a rotating shaft 22. A guide roller 9b is rotatably attached to the other end of the bar 8.

The opening/closing leg arm 7 for rotating the bar 8 is rotatably attached to the cart 10 by a rotating shaft 23, as shown in FIG. Two rollers 24 and 25 are attached to the opening/closing leg arm 7 in such a manner as to sandwich the bar 8 from both sides. Ropes 6a and 6b for operating the arm 7 are attached to both ends of the arm 7 for opening and closing legs.

As seen in FIG. 4, a plate cam 26 having an inclined groove 14 is fixed to a nut 27.
7 is attached to a screw shaft portion 18 machined into the connecting bar 11, and this screw shaft portion 18 is rotatably attached to the truck 10. A pin 31 is slidably inserted into the groove 14 and is fixed to one end of the bracket 28. This bracket 28 is attached to the roller 2 attached to the trolley 10.
9 maintains its posture perpendicular to the orbit 1, and can move in a direction perpendicular to the orbit 1 while being guided by rollers 29. A gear 15 for stopping and fixing the truck 10 on the track is fixed to this bracket 28. The connecting bar 11 has an appropriate length and is connected by a connector 30 to increase the overall length, and a handle 12 is fixed to the final end thereof. wire 4
is attached to the drive device 5 via the guide roller 9b.

In this embodiment, the drive device 5 of the ultrasonic flaw detector stopped in the circumferential orbit 2 is recovered as follows. A bogie 10 is installed on a vertical track 1 so as to be able to run on track rollers 16, and is made to run along the vertical track 1 in the direction of a turntable 3. In this case, bar 8
is held in a posture parallel or nearly parallel to the vertical track 1 by operating the opening/closing leg arm 7. Trolley 10
In order to stop and fix the movement of the trolley 10 when the guide roller 9b moves and the guide roller 9b is located at the same height as the circumferential track 2, the handle 12 is turned to rotate the connecting bar 11, and the screw shaft portion 18 is rotated. By moving the nut 27 to the right in FIG. 4, the plate cam 26 is moved. The pin 31 is pushed downward in the cam groove 14, the fixing gear 15 engages with the rack 17, and this engagement fixes the truck 10 so that it does not move along the vertical track 1.

Next, pull up the rope 6a and move the opening/closing leg arm 7 around the rotating shaft 23 in the direction of arrow A in FIG.
The bar 8 is rotated until it hits the fixing stopper 19 of the truck 10, and the bar 8 is pivoted about the rotating shaft 22 in the direction of arrow B, that is, in the opposite direction to the drive device 5. Since the opening/closing leg arm 7 and the bar 8 are engaged with each other with the bar 8 sandwiched between the rollers 24 and 25, the bar 8 can rotate in synchronization with the opening/closing leg arm 7. Next, the wire 4 is pulled to draw the drive device 5 toward the turntable 3 side. This pulling force acts on the drive device 5 when the wire 4 is bent by the guide roller 9b and in a horizontal state, so the tensile force is efficiently transmitted to the drive device and the recovery operation becomes easy. Even if the wire 4 is pulled, since the trolley 10 is fixed to the vertical track 1, the pulling force is not absorbed by the movement of the trolley 10, and reliable recovery work is performed. During recovery work, the length of the bar 8 is appropriately selected so that it does not touch the orbit 2, as shown in Figure 7, so that the narrow space between the orbit 2 and the reactor pressure vessel 20 can be utilized. Can perform collection work. When the collection to the turntable 3 is completed, pull the rope 6b to return the opening/closing leg arm 7 to its original position, rotate the turntable 3,
The wire 4 is pulled to retrieve the drive device 5 to the vertical track 1.

By running the cart 10 having the mechanism as in this embodiment, it is possible to reliably pull the drive device 5 to the turntable 3 without contacting the circumferential track 2, and the automatic ultrasonic flaw detection device in an emergency can be used. It is effective in recovering safely and reliably.

As a modified example of the mechanism of the trolley 10, a handle 12 is attached via a connecting bar 11.
It is possible to fix the trolley 10 on the vertical track 1 by rotating it with a motor, or to change the position of the roller 9b by electrically operating the opening/closing leg arm 7.

As described above, according to the present invention, it is possible to easily recover a drive device, such as an ultrasonic drive device, which has stopped on the circumferential orbit, to the vertical orbit while avoiding contact with the circumferential orbit 2.

[Brief explanation of drawings]

FIG. 1 is an overall diagram of conventional emergency recovery, FIG. 2 is a schematic diagram of another conventional emergency recovery, FIG. 3 is a schematic diagram of emergency recovery according to the present invention, and FIG. 4 is an explanatory diagram of an emergency recovery trolley according to the present invention. FIG. 5 is a schematic diagram of the mechanism of the emergency recovery trolley according to the present invention, and FIGS. 6a and 6b show the relationship between the rollers 9a, the reactor pressure vessel, and the track material during the recovery operation by the method shown in FIG. The plan view, front view, and FIG. 7 are also plan views of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Vertical track, 2... Circumferential track, 3... Turntable, 4... Wire, 5... Drive device, 6a,
6b...Arm for opening/closing legs, 8...Bar, 9a, 9
b...Roller, 10...Dolly, 11...Connection bar, 12...Handle, 14...Plate cam, 15...
...fixing gear, 16...orbit roller, 28...screw shaft, 31...pin.

Claims (1)

[Scope of Claims] 1. A nuclear reactor pressure vessel and a heat insulating material disposed around the outer periphery of the reactor pressure vessel with a space between the space and the space.
The internal structure includes a vertical track, a circumferential track, and a transfer means between these tracks, which are provided around the pressure vessel, and has a track for running and moving a driving device, and a wire attached to the driving device is connected to a guide roller. In a nuclear reactor facility provided with a means for moving the drive device on a circumferential orbit by pulling the drive device along the circumferential track, a truck is provided that can run on the vertical track and stop at an appropriate location, A nuclear reactor facility equipped with a track running device, characterized in that the truck is equipped with a bar having guide rollers for guiding a wire. 2. The nuclear reactor equipment according to claim 1, wherein the bar is capable of moving the guide roller from a vertical direction to a circumferential direction.