JPS6134119B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides, for example, a cylinder of a control rod drive mechanism,
The present invention relates to an automatic cleaning device for nuclear reactor internal parts for automatically cleaning tubular or rod-shaped nuclear reactor internal parts such as index tubes and piston tubes.

For example, during periodic inspections of light water reactors, the control rod drive mechanism is extracted from the reactor pressure vessel, transported to an overhaul inspection room, disassembled and cleaned in a water tank in the inspection chamber, and then inspected. .

Conventionally, internal parts such as cylinders and index tubes of control rod drive mechanisms are generally cleaned by hands by workers, both on their outer and inner surfaces. Therefore, in the past, there was a problem in that the cleaning work required a large number of people and a lot of effort, and it was particularly difficult to clean the inner surface of a long pipe. Furthermore, since the overhaul room where activated reactor internal parts are handled is exposed to radiation, long cleaning work is not desirable in terms of worker safety.

The present invention was developed under the above circumstances, and its purpose is to clean tubular or rod-shaped nuclear reactor internal parts, regardless of the diameter of the parts.
An object of the present invention is to provide an automatic cleaning device for internal parts of a nuclear reactor that can be automatically cleaned without requiring any human intervention and can contribute to reducing radiation exposure of workers.

Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings.

As shown in FIG. 1, the automatic cleaning device according to the present invention includes a component holding device 1, a component removal device 2, an inner surface cleaning device 3, a cleaning tool selection device 4, an external surface cleaning device 5, and a control device 6. It is configured.

As shown in FIGS. 1 and 2, the component holding device 1 has at least two pairs of support rollers 8 and 9 rotatably attached to the top surface of the device base 7, and one support roller, for example 8, is rotatably mounted on the top surface of the device base 7. It is formed by providing a roller drive mechanism 10 for rotational driving. Note that a part of the device base 7 has an escape (not shown) to allow the movement of the component attachment/detachment device 2, which will be described later.
is formed. In this embodiment, the roller drive mechanism 10 includes a drive motor 10a, a connecting drive shaft 10b connecting each support roller 8, and this shaft 1.
0b and a gear 10c that interlocks the motor output shaft. And this component holding device 1
On the plurality of sets of support rollers 8 and 9, tubular or rod-shaped reactor parts A, such as cylinders, index tubes, and piston tubes of the control rod drive mechanism, are placed.

The parts attachment/detachment device 2 is used to attach/detach the furnace parts A to the support rollers 8 and 9. As shown in FIG. 1 and FIG.
The base plate 12 of the support parts 11, 11 supporting the apparatus is provided on an apparatus base 13 so as to be movable up and down using a cylinder or the like, and the apparatus base 13 is provided so as to be reciprocatable along rails 14, 14. rail 1
4 and 14 are laid in a direction perpendicular to the axial direction of the furnace parts A supported by the support rollers 8 and 9. Further, the device base 13 is adapted to drive wheels that come into rolling contact with the rails 14, cylinders, etc. by means of a drive mechanism 15 mounted thereon.
In addition, in this embodiment, the movement of the component attachment/detachment device 2 (the movement of the support part 11 and the movement of the device base 13) is carried out as shown in the thin line in FIG. This is carried out along the route shown by the arrow, and when the furnace internal parts A after cleaning are taken out from the parts holding device 1, it is carried out along the route shown by the dotted line arrow in FIG.
Moreover, at the position A in FIG. 2, the parts removal device 2 is automatically supplied with unwashed furnace parts A carried by a carry-in conveyor (not shown), and cleaned furnace parts A are shown in the figure. The material is automatically transferred to the unloading conveyor. In addition, in this embodiment, the component removal device 2 is as follows:
In this case, the operation of supplying unwashed furnace parts A to the support rollers 8 and 9 and the operation of taking out the cleaned furnace parts A to the support rollers 8 and 9 are carried out by one device. However, even if these operations are performed by separate devices, the present invention includes these devices as a set as a component removal device.

The inner surface cleaning device 3 is constructed as shown in FIGS. 1, 3, and 6, and is operated only when the furnace interior component A is a pipe to clean the inner surface of the furnace interior component A. ing. That is, 16 is a device base, and a plurality of rod-shaped cleaning tool holders 17... are passed through a guide portion 16a provided on the upper surface of the device base so as to be movable in the axial direction. These cleaning tool holders 17...... have their outer surfaces coated with a resin film, and their respective holder drive mechanisms 18
As a result, the furnace parts A are reciprocated in the axial direction. The holder drive mechanism 18 includes a plurality of feed rollers 18a that roll into contact with the cleaning tool holder 17.
. . . and a drive motor 18b that rotationally drives one of the feed rollers 18a. And each cleaning tool holder 17……
An inner surface cleaning tool 20 with a brush 19 is attached to the tip of each of the inner surfaces. As shown in FIGS. 6 and 8, the cleaning tool 20 is formed by fitting and fixing a cap-shaped brush 19 to a cleaning tool main body 21, and providing a water wheel portion 22 on the opposite side of the brush 19. has been done. The brush 19 is removable and is fitted so as to rotate together with the cleaning tool main body 21. Note that 23 is a screw for attaching the inner surface cleaning tool 20, and serves as the center axis of rotation of this cleaning tool 20. Further, at the tip of the cleaning tool holder 17, a cleaning liquid such as water is sprayed toward the water wheel section 22,
A cleaning liquid supply tool 24 for supplying to the inner surface cleaning section is also attached. Moreover, at the tip of the cleaning tool holder 17, there is a rotary ring 2 that contacts the inner surface of the furnace interior part A.
5 is installed. In addition, the plurality of inner surface cleaning tools 20 supported in the above manner have different direct diameters D and heights H from the floor surface depending on the plurality of different types of furnace internal parts. Each one is different.

The cleaning tool selection device 4 moves the component holding device 1 or the inner surface cleaning device 3 in a direction perpendicular to the axial direction of the furnace component A, and makes any inner surface cleaning tool 20 face the furnace component. used. This embodiment shows a case where the inner surface cleaning device 3 is moved, and a drive motor 26 mounted on the device base 16,
Wheels 27 rotated by this motor 26...
. . . and a rail 28 that is laid perpendicularly to the moving direction of the cleaning tool holder 17 while these wheels 27 . . . roll into contact with each other.

The external surface cleaning device 5 is constructed as shown in FIGS. 1 and 7, and is provided to clean the external surface of the furnace whether the furnace internal part A is a tube or a rod. In other words, 29 is the main body of the device,
This is the rail 3 arranged above the above devices 1 to 4.
0 as a guide, it is movable along the axial direction of the furnace part A, and 31 indicates a drive motor for self-propulsion. An elevating mechanism 32 is attached to the main body 29 of the apparatus, by which an external cleaning tool 33 with a brush is moved up and down. In the case of this embodiment, the elevating mechanism 32 includes a pneumatic diaphragm 34 and a rotating rod whose middle portion is rotatably supported by a support portion 35 and whose one end is pivoted to an elevator 36 that is linked to the diaphragm 34. 37 and this rotating rod 37
The cleaning tool mounting rod 38 is pivotally connected to the other end. Two external cleaning tools 33 with brushes are used in this embodiment, and these have the same structure as the internal cleaning tool 20 with brushes, and a rotatable brush is attached to the tip of the cleaning tool mounting rod 38. installed. Further, the device main body 29 sprays a cleaning liquid such as water toward the water wheel portion 39 of the external cleaning tool 33,
A cleaning liquid supply tool 40 for supplying to the external surface cleaning section is also attached.

In addition, each of the cleaning liquid supply tools 24......, 40
………… is connected to a husband liquid supply hose 41 …………, and these hoses 41 ………… are connected to the discharge side of a cleaning liquid supply pump 44 via a winding device 42 and a solenoid valve 43, respectively. has been done. As shown in FIGS. 4 and 5, the winding device 42 has a fixed housing 46 disposed on one side of a rotatably supported hose winding drum 45, and the housing 46 and the winding drum shaft 47 are connected to each other. Spiral spring 4 between
It is formed by housing 8. Therefore, since the spiral spring 48 is wound up when the liquid supply hose 41 is fed out, the hose 41 can be automatically wound up.

Further, the control device 6 controls each of the devices 1 to 5 according to the type, shape, size, etc. of the furnace parts A.
and cleaning liquid supply pump 44, solenoid valve 43...
etc., in a predetermined order, and the data necessary for the control is stored in advance in the microcomputer built inside.

Next, the cleaning operation according to the above embodiment will be explained. For example, when a tubular furnace part A is automatically supplied to the parts removal device 2, this device 2 is operated by a command from the control device 6. The component attachment/detachment device 2 first raises the support part 11, moves along the rail 14, moves to the center of the component holding device 1, and then moves to the center of the component holding device 1.
By lowering the support part 11 at this position,
Furnace parts A are held by support rollers 8 and 9 of part holding device 1.
After that, it is moved along the rail 14 to the initial position and stands by in preparation for taking out the cleaned furnace internal parts A. Also, along with the component removal device 2, the cleaning tool selection device 4 receives instructions from the control device 6.
is also operated. This device 4 moves the inner surface cleaning device 3 along the rail 28 by driving a drive motor 26, so that the inner surface cleaning tool 20, which is sized to match the inner diameter of the furnace part A, moves along the inner diameter of the furnace part A. Directly facing one end of A. Furthermore, the elevating mechanism 32 of the outer surface cleaning device 5 is operated by a command from the control device 6, and the outer surface cleaning tool 33 is raised or lowered. This movement is stopped at a position where the outer surface cleaning tool 33 can be pressed against the outer surface of the furnace interior part A. After this, the control device 6
In response to the command, only the electromagnetic valves 43 corresponding to the external cleaning tool 33 and the selected internal cleaning tool 20 are opened, and the cleaning liquid supply pump 44 is driven. Then, the cleaning liquid is supplied to the cleaning liquid supply tools 24, 4.
Since the water is injected from zero toward the water wheel portions 22, 39 of each of the cleaning tools 20, 33, each of the cleaning tools 20, 33 is driven to rotate in response to this jetting pressure without requiring any special driving force. After that, the control device 6
The roller drive mechanism 10 of the component holding device 1 is operated in response to a command from , and the furnace component A on the support rollers 8 and 9 is rotated. In this state, the holder drive mechanism 18 of the inner surface cleaning device 3 is driven by a command from the control device 6, thereby moving the cleaning tool holder 17 forward and pushing the inner surface cleaning tool 20 into the inner surface of the furnace part A. When the drive motor 31 of the external cleaning device 5 is driven, the device 5 moves forward along the rail 30, and the external cleaning tool 33 first cleans one end surface of the furnace internal parts A, and then cleans the inside of the furnace. It is moved while touching the outer surface of item A. Each of these cleaning tools 20, 3
The moving distance of each furnace part A is controlled by the control device 6 in accordance with the length of the furnace part A, and after moving forward from one end of the furnace part A to the other end, it is reversely moved back. Note that, at the start of the backward motion, the other end surface of the furnace internal part A is cleaned by the outer surface cleaning tool 33. In this way, automatic cleaning of the inner and outer surfaces of the furnace internal parts A is performed by the inner surface cleaning tool 20 and the outer surface cleaning tool 33, which are rotationally driven. Note that during the backward movement, the liquid supply hose 41 is automatically wound up by the winding device 42. After this return movement is completed, the cleaning liquid supply pump 44 is first stopped in response to a command from the control device 6, and then the component removal device 2 is operated again. In this case, the component removal device 2 first moves along the rails 14 to the center of the component holding device 1, raises the support portion 11 at this position, and loads the cleaned furnace components A onto the support portion 11. The furnace parts A are taken out from the parts holding device 1, and the taken out furnace parts A are automatically carried out, and the parts removal device 2 then returns to the initial position.

Automatic cleaning of the furnace part A is completed by the above-mentioned operation, but if the furnace part A is a rod, the inner surface cleaning device 3 is not operated, and if there is a step on the outer periphery of the furnace part A, the inner surface cleaning device 3 is not operated. In response to a command from the control device 6, the elevating mechanism 32 is operated according to the position of the step, and the external cleaning tool 33 is moved up and down in accordance with the step.

Note that although the above embodiment is configured as described above,
In carrying out the present invention, unless it is contrary to the gist of the invention, parts holding devices, support rollers, parts detaching devices,
Specific details such as the support part, external cleaning device, external cleaning device with brush, cleaning liquid supply device, lifting mechanism, internal cleaning device, cleaning device holder, internal cleaning device with brush, cleaning device drive mechanism, holder selection device, and control device. structure,
Of course, the shape and position etc. can be implemented in various configurations without being restricted to the one embodiment described above.

As explained above, the present invention includes a component holding device for mounting and rotating tubular or rod-shaped furnace components;
A component removal device that attaches and detaches the furnace internal components to the holding device, an external surface cleaning device that cleans the external surface of the furnace internal components, and an internal surface cleaning device that cleans the internal surface of the furnace internal components;
It is equipped with a cleaning tool selection device and a control device that controls a series of operations of each of these devices, so whether the furnace internal parts are tubular or rod-shaped, they can be automatically cleaned without the need for human intervention. . Therefore, it can contribute to reducing radiation exposure of workers. The external cleaning device has a lifting mechanism that allows the external cleaning tool with a brush to be moved up and down, so even if the parts inside the furnace have a step, the external cleaning tool can automatically follow the step and perform cleaning. It can be carried out. Furthermore, in conjunction with this, the internal surface cleaning device has multiple internal surface cleaning tools with brushes, which can be selected according to the furnace internal parts using a holder drive mechanism, so that it can automatically clean the internal furnace internal parts of any diameter. Can be washed separately.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is an overall configuration diagram, FIG. 2 is a view taken along the line shown in FIG. 1, FIG. 3 is a plan view of the inner surface cleaning device, and FIG. FIG. 5 is a sectional view taken along the line - in FIG. 4, FIG. 6 is an enlarged sectional view taken along the line - in FIG. 3, and FIG. 7 is a front view of the external cleaning device. The figure is a sectional view taken along the line - in FIG. 6. 1... Parts holding device, 2... Parts removal device, 3
...Inner surface cleaning device, 4...Cleaning tool selection device, 5...
... External cleaning device, 6 ... Control device, 8, 9 ... Support roller, 10 ... Roller drive mechanism, 11 ... Support part, 15 ... Drive mechanism, 17 ... Cleaning tool holder, 18 ... Holder drive Mechanism, 19...brush,
20... Inner surface cleaning tool, 22... Water wheel section, 24...
Cleaning liquid supply tool, 32... Lifting mechanism, 33... External cleaning tool, 39... Water wheel section, 40... Cleaning liquid supply tool, A... Furnace internal parts.

Claims (1)

[Claims] 1. A component holding device on which a tubular or rod-shaped furnace component is placed and having a support roller that rotates the furnace component; and a support section that supports the furnace component. a parts detaching device which is movably provided and which attaches and detaches the furnace internal parts to the support rollers by this movement; and a brush equipped which is pressed against the outer surface of the furnace internal parts placed on the support rollers and driven to rotate. It has an external surface cleaning tool and a cleaning liquid supply device that supplies cleaning liquid to the external surface cleaning section, and is equipped with a lifting mechanism that moves the external surface cleaning device with a brush and the cleaning liquid supply device up and down at the same time. It has an external cleaning device that is movable along the line, and a plurality of rod-shaped cleaning tool holders.
Each cleaning tool holder has an inner surface cleaning tool with a brush that is attached to the tip of each of the holders and rotates while being pressed against the inner surface of the furnace internal parts, and a cleaning fluid supply tool that supplies cleaning fluid to the inner surface cleaning section. an inner surface cleaning device equipped with a holder drive mechanism that reciprocates the holder in the axial direction of the furnace parts, and the above-mentioned component holding device or the inner surface cleaning device is moved in a direction perpendicular to the axial direction of the furnace parts to perform arbitrary inner surface cleaning. An automatic cleaning device for nuclear reactor internal parts, comprising: a cleaning tool selection device that makes a tool face the reactor internal components; and a control device that operates each of the above devices in a predetermined order. 2. The nuclear reactor according to claim 1, wherein each of the cleaning tools is formed with a water wheel portion that receives the cleaning fluid injected from the cleaning fluid supply tool, and is rotationally driven by the cleaning fluid. Automatic cleaning device for internal parts.