JPS6126725Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for attaching or detaching a nozzle cover to a nozzle portion of a steam generator.

During periodic inspections of pressurized water nuclear power plants, steam generator inspections must be conducted with all primary system cooling water drained, and refueling of the reactor vessel must be performed with primary system cooling water filled. be. However, because the steam generator and the reactor vessel are connected through the primary cooling water pipe, these tasks could not be performed in parallel, and periodic inspections required many man-hours. To resolve this problem, cover the nozzle of the primary cooling water inlet and outlet of the steam generator from the steam generator water chamber side, temporarily stop the cooling water, and stop working on the steam generator and reactor vessel. You can do it in parallel. However, if the nozzle cover is installed manually in the water chamber of the steam generator, the amount of radiation exposure will be enormous, so to prevent exposure, this work must be done by remote control. .

The present invention was developed in view of the above-mentioned circumstances, and the present invention is designed to accommodate a large number of fastening members in a main body that can be attached to a manipulator and has the function of rotating around an axis, and by rotating these fastening members. a magazine device that can sequentially supply the fastening members to predetermined positions; a tightening tool that can grip the fastening members supplied to the predetermined positions by the magazine device and drive the fastening members to rotate around an axis parallel to the axis of the main body; means for moving the tightening tool in a direction parallel to the axis of the main body; means for moving the tightening tool in a direction perpendicular to the axis of the main body; and means for swinging the tightening tool in a direction perpendicular to the axis of the main body. The invention is characterized in that it is provided with means.

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a water chamber of a steam generator, 2 is a nozzle communicating with the water chamber 1, and 3 is a mounting seat fixed to the nozzle 2. 4 is the nozzle lid a,
Reference numeral 5 denotes a nozzle lid b, and both are connected by bolts 6 and integrally form a nozzle lid 7. Numeral 8 is a fixing bolt for attaching the nozzle lid 7 to the mounting seat 3, and a large number of these bolts are stored in the magazine 9. Reference numeral 10 denotes a bolt rotation device that has a mechanism for gripping the bolt 8 at its tip and rotates the bolt 8. Reference numeral 11 denotes a swinging mechanism for swinging the bolt rotation device 10, which is slidably supported by the axial direction feeding mechanism 12.
A main body 13 rotatably supports the magazine 9, supports the axial feed mechanism 12 so as to slide in the radial direction, and is engageable with the center of the nozzle lid 7. 13a
is a fixed shaft that rotatably supports the main body 13, and is connected to a clamping device 16 of the remote control manipulator 15.
mounted on. Reference numeral 14 denotes a turning device that drives the main body to turn.

The operation of the above device will be explained based on FIG. When the bolt rotating device 10 is in the state of
After gripping the bolt 8 attached to the bolt 8, the bolt rotating device 10 swings and descends to the state shown in FIG. The bolt rotating device 10 is restarted from the state of B.
When the bolt 8 is swung, the bolt 8 is inserted into the fixing hole between the mounting seat 3 and the nozzle lid 7. Here, by driving the bolt rotation device 10, the bolt 8 can be rotated and the nozzle lid 7 can be fixed to the mounting seat 3. These operations are performed on the circumference of the nozzle lid 7 while the main body 13 is rotated by a predetermined angle by the rotation device 14.

Next, another embodiment of the present invention will be described with reference to FIGS. 3 and 4. This embodiment differs from the previous embodiment only in the magazine and is otherwise similar. A magazine 17 shown in FIG. 3 stores stud bolts 18, and a magazine 19 shown in FIG. 4 stores nuts 20. The operation of attaching the nozzle lid 7 will be explained below.
After the bolt rotation device 10 grips the stud bolt 18 housed in the magazine 17 as shown in FIG.
8 corresponds to the nozzle cover fixing hole position of the mounting seat 3. Next, by rotating the bolt rotating device 10 while moving it in the axial direction, the stud bolt 18 is screwed into the mounting seat 3 as shown in FIG. Next, the nozzle lid 7 is placed on the mounting seat 3 by a device not shown. This is shown in Figure 4A. Figure 4 shows the process of fixing the nozzle cover 7 to the mounting seat 3, and shows the process of fixing the nozzle cover 7 to the mounting seat 3.
The nut 20 stored in the stud bolt 18
Fixing work is done by screwing into the That is, as shown in A, after the bolt rotating device 10 grips the nut 20 stored in the magazine 19,
By moving the axial feed mechanism 12 in the radial direction, the nut 20 is brought into alignment with the stud bolt 18 as shown in FIG. In this state, when the bolt rotating device 10 is moved in the axial direction and rotated, the nut 20 is rotated to the stud bolt 1 as shown in C.
8, and the nozzle lid 7 is fixed to the mounting seat 3. These operations are carried out on the main body 1 by the turning device 14.
3 is rotated by a predetermined angle and the above operation is repeated, thereby tightening and fixing the nozzle lid 7 to the mounting seat 3 over the entire circumference.

The above-mentioned operation is for attaching the nozzle cover 7, but to remove the nozzle cover 7, the operation in reverse can be performed in the same manner.

As explained above, according to the present invention, it is possible to attach it to a remotely controlled manipulator, and also to rotate the fastening member stored in the magazine device, thereby automating fastening. It becomes possible to safely attach a nozzle lid to a steam generator.

[Brief explanation of the drawing]

FIGS. 1 and 2 show an embodiment of the present invention, with FIG. 1 being a front view and FIG. 2 being a nozzle cover installation process diagram. 3 and 4 are nozzle lid attachment process diagrams showing another embodiment of the present invention. 1... Steam generator water chamber, 2... Nozzle, 3... Mounting seat, 7... Nozzle lid, 8... Bolt, 9... Magazine,
10... Bolt rotation device, 15... Remote control manipulator.

Claims (1)

[Scope of utility model registration request] A magazine device that stores a large number of fastening members in a main body that can be attached to a manipulator and has a function of rotating around an axis, and that can sequentially supply these fastening members to predetermined positions by rotating; a tightening tool capable of gripping a fastening member supplied to a predetermined position and rotating it around an axis parallel to the axis of the main body; and means for moving the tightening tool in a direction parallel to the axis of the main body. A nozzle lid mounting tool, comprising: means for moving the tightening tool in a direction perpendicular to the axis of the main body; and means for swinging the tightening tool in a direction perpendicular to the axis of the main body.