JPS6331757B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for cleaning the inner surface of a relatively large container, such as a suppression pool of a nuclear reactor.

As shown in Fig. 1, a boiling water reactor is provided with an annular suppression pool C outside a dry well A through a large number of vent pipes B. The water in C is used as an emergency cooling system in the event of a loss of coolant accident, or for removing residual heat when the reactor is shut down. However, due to the inflow of primary condensate into the suppression pool C during the residual heat removal process described above, corrosion products such as iron rust with a high radiation dose and other impurities are mixed in and adhere to the inner surface of the pool. Alternatively, the contaminated layer D is deposited and becomes a source of contamination with a high radioactivity level, so that the contaminated layer D needs to be removed. In particular, when repairing the inner surface of a pool, it is essential to remove the contaminated layer D in order to reduce radiation exposure of workers performing the repair work. Therefore, it has been considered to clean the inner surface of the pool by stirring the water in pool C at high speed using a water pump, but the capacity of pool C is, for example, 1,500 to 3,000 ^m3 . Therefore, such stirring means cannot perform effective cleaning, and has the disadvantage that the equipment is quite large-scale.

The present invention was made based on the above circumstances, and its purpose is to provide a container inner surface cleaning device that can efficiently and reliably clean the inner surface of a container and has a high cleaning effect with relatively small equipment. There is a particular thing.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. In the figure, reference numeral 1 denotes a main body of the cleaning device, and the main body 1 of the cleaning device is shaped like a sealed container and floats on the water surface in the suppression pool C. Further, a rotating brush 3 serving as a rotating cleaning body is attached to the cleaning device main body 1 via a fixed arm 2. This rotating brush 3 has a brush main body 3a that comes into sliding contact with the inner surface of the pool C.
and a casing 3b that covers the back side of the brush body 3a, and the casing 3b
is pivotally supported on the fixed arm 2 by a pivot 4, and can freely rotate about the pivot 4 in the direction of arrow F in FIG. Also,
The brush main body 3a is rotated by rotating a driven pulley 5 attached to the pivot shaft 4, and this pulley 5 is provided on the cleaning device main body 1 side via a power transmission belt 6. The drive pulley 7 is interlocked with a drive pulley 7, and the drive pulley 7 is rotatably driven by a brush rotation motor (not shown) built into the cleaning device main body 1.
Furthermore, another driven pulley 8 that rotates together with the driven pulley 5 is attached to the pivot shaft 4,
This driven pulley 8 is linked via a power transmission belt 9 to an oscillating drive pulley 37 in a cleaning water injection mechanism 30, which will be described later.

The cleaning device main body 1 also includes a screw 11 and a screw 11 that rotates forward and backward as a first propulsion mechanism 10 for moving the main body 1 in the front-rear direction, that is, in the direction toward and away from the inner surface of the pool C. A motor (not shown) is provided.

Further, the cleaning device body 1 is provided with a second propulsion mechanism 12 for moving the body 1 laterally, that is, horizontally along the inner peripheral surface of the pool C. This second propulsion mechanism 12 is configured as follows. That is, in FIG. 3, 13 is a water pump, and the suction port 14 of this water pump 13 is
is open on the front side of the cleaning device main body 1 so that pool water can be sucked in. In addition, the discharge side of the water pump 13 has two discharge pipe lines 15 and 16.
It is branched into. Each discharge pipe line 15, 16 is provided with a solenoid valve 17, 18, respectively, and one discharge pipe line 15 communicates with propulsion injection ports 19, 19 opened on one side of the cleaning device main body 1. , and the other discharge pipe 16 is communicated with propulsion injection ports 20 , 20 opened on the other side of the cleaning device main body 1 . The second propulsion mechanism 12 and the first propulsion mechanism 10 are each configured to be remotely controlled from outside the pool.

Furthermore, the cleaning device main body 1 includes a sewage suction mechanism 21.
is provided. To explain this sewage suction mechanism 21, numeral 22 in FIG. The suction port 24 is opened, for example, on the inner surface of the casing 3b so as to be located near the rotating brush 3. On the other hand, the suction pump 22
A drain pipe 25 is connected to the discharge side of the pool, and this drain pipe 25 is connected via a drain tube 26 to a sewage treatment system installed outside the pool.

Furthermore, the cleaning device main body 1 is provided with a cleaning water injection mechanism 30. In other words, 3 in Figure 2
Reference numeral 1 denotes a spray nozzle, and this spray nozzle 31 is provided at the tip of a spray conduit 32 and is configured to spray cleaning water toward the inner surface of the pool C.
Further, a water supply tube 33 is connected to the injection conduit 32, and this water supply tube 33 is connected to a cleaning water supply source (not shown) provided outside the pool C. Further, the base end of the injection conduit 32 is connected to a rotatable support 34 attached to the cleaning device main body 1.
The distal end of the injection conduit 32 is supported by the distal end of a rotary arm 35 that rotates in a horizontal plane, and as the rotary arm 35 rotates, it rotates around the support 34. As a result, the injection conduit 32 is designed to perform a so-called oscillating movement in a horizontal plane. The rotating arm 35 is linked to a swing drive pulley 37 via a worm gear mechanism 36, and this pulley 37 is linked to the driven pulley 8 of the cleaning rotating brush 3 via the power transmission belt 9 described above. .

Next, the operation of the device of the above embodiment will be explained. First, the device of this embodiment is floated on the water surface in the pool C, the first propulsion mechanism 10 is operated by remote control, and the cleaning device main body 1 is advanced toward the inner surface of the pool C by the thrust of the screw 11. . At the same time, by rotating the brush rotation motor, the brush main body 3 of the rotating brush 3 is
Rotate a. Before the brush main body 3a comes into sliding contact with the inner surface of the pool C, the rotating brush 3 is in a position of being rotated and lowered around the pivot shaft 4 due to its own weight, but due to the thrust of the screw 11, the brush main body 3a When it comes into contact with the inner surface of the pool, it rotates upward about the pivot 4 into a posture corresponding to the curved shape of the inner surface of the pool, and the front surface of the brush body 3a evenly slides into contact with the inner surface of the pool. Therefore, the contaminated layer D is rubbed off by the brush main body 3a, and this contaminated water containing pollutants is sucked in from the suction port 24 by operating the suction pump 22, and drained through the drain pipe 25 and the drain tube 26. is sent to the sewage treatment system outside the pool.

Further, when cleaning is performed using the rotating brush 3 as described above, the driven pulley 8 rotates, thereby rotating the oscillating drive pulley 37 via the power transmission belt 9, and the rotating arm 35 rotates. Therefore, the injection conduit 32 swings in a horizontal plane. At the same time, cleaning water is supplied to the water supply tube 33 from a cleaning water supply source outside the pool, and as the injection pipe 32 swings, this cleaning water reciprocates left and right from the injection nozzle 31 toward the inner surface of the pool. The jet stream washes away the inner surface of the pool, further enhancing the cleaning effect.

While cleaning is performed by the rotating brush 3 and the injection nozzle 31 as described above, by opening either one of the electromagnetic valves 17 and 18 in the second propulsion mechanism 12, the water is pumped by the water pump 13. The water flow is transmitted through the propulsion jet port 19,1.
9 or 20, 20. The cleaning device main body 1 is then moved laterally, that is, in the horizontal direction along the inner circumferential surface of the pool C by the driving force obtained by this jet stream. This movement cleans along the water surface, so as the cleaning progresses, the pool water is gradually drained to lower the water level, lowering the cleaning position, and finally cleaning the bottom of the pool. It is something.

According to the device of the above embodiment, the rotating brush 3 directly slides into contact with the inner surface of the pool C, and the contaminated layer D
It has a high cleaning effect and can reliably clean the inner surface of the pool. Moreover, the contaminated water containing the scrubbed contaminants is sucked in through the suction port 24 and sent to the sewage treatment system outside the pool, preventing contaminants with high radioactivity levels from dispersing into the pool water. It is possible to reduce radiation exposure of workers.

In addition, since the cleaning water is sprayed from the spray nozzle 31 toward the inner surface of the pool, the inner surface of the pool can be washed away with clean water, and contaminants can be reliably prevented from remaining. Moreover, since the rotating brush 3 of this embodiment can freely rotate around the pivot 4 and correspond to the curved shape of the inner surface of the pool, the brush body 3a can be evenly slid into contact with the inner surface of the pool at all positions on the inner surface of the pool. This has the advantage that the entire inner surface of the pool can be cleaned uniformly.

Although this embodiment describes the case of cleaning a suppression pool, the present invention can be applied to any container whose inner surface needs to be cleaned, and the scope of application is not limited to the embodiment. It is not something that will be done. In addition, the rotary cleaning body may be of any type as long as it can scrape off the contaminated layer on the inner surface of the container, so it goes without saying that its specific form is not limited to a brush-like one, but can be modified in various ways.

As explained above, the present invention includes a cleaning device body floating on the water surface in a container, a first propulsion mechanism attached to the cleaning device body and moving the cleaning device body in a direction toward and away from the inner surface of the container. a second propulsion mechanism that is attached to the cleaning device body and moves the cleaning device body in a horizontal direction along the inner surface of the container; a brush body that is connected to the cleaning device body and comes into sliding contact with the inner surface of the container; and a brush body that accommodates and supports the brush body. a rotating brush comprising a casing rotatable in a vertical plane, a drive mechanism installed in the cleaning device body to rotate the brush body of the rotating brush, and a drive mechanism installed in the cleaning device body to rotate the brush body of the rotating brush; a cleaning water injection mechanism that is attached to the main body of the cleaning device and that swings in the horizontal direction in synchronization with the rotational movement of the rotary brush to which the power from the drive mechanism is transmitted and injects cleaning water onto the inner surface of the container; A suction port is located within the rotating brush, and its discharge port is connected to a drainage tube disposed up to the main body of the cleaning device, and wastewater containing pollutants is sucked through the suction port and is then discharged through the discharge port. This system is characterized by being equipped with a sewage suction mechanism for discharging sewage into a drainage tube.

Therefore, since the inner surface of the container can be directly cleaned using the rotating brush, even a large-capacity container can be efficiently and uniformly cleaned. Therefore, when the present invention is applied to cleaning suppression pools, etc. in nuclear power plants, it is possible to reliably remove the contaminated layer with a high radiation dose that adheres to and deposits on the inner surface of the pool, and it is effective in terms of radiation protection. Extremely effective. Further, since cleaning work can be performed by remote control from outside the container, radiation exposure of workers can be reduced. Further, since the main body of the cleaning device can be moved to a desired location as appropriate by the first propulsion mechanism and the second propulsion mechanism, it is effective in efficiently and uniformly cleaning the inside of the container. Further, the dirty water after cleaning is reliably sucked and discharged by the dirty water suction mechanism, so that the inside of the container is not contaminated. Furthermore, in the case of the present invention, a cleaning water jetting mechanism is provided, and this cleaning water jetting mechanism swings horizontally in synchronization with the rotational movement of the rotating brush, so that effective cleaning can be carried out over a wide area. can. Furthermore, in the case of the present invention, the entire apparatus is smaller than that in the case of agitation cleaning using a conventional pump.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing a part of a boiling water reactor, Fig. 2 is a side view showing a cleaning device according to the present invention, and Fig. 3 is a cross-sectional view of the main body of the cleaning device along the line - in Fig. 2. FIG. DESCRIPTION OF SYMBOLS 1... Cleaning device main body, 3... Rotating cleaning body (rotating brush), 10... First propulsion mechanism, 12... Second
Propulsion mechanism, 21... Sewage suction mechanism, 24... Suction port, 30... Cleaning water injection mechanism, C... Container (suppression pool).

Claims (1)

[Claims] 1. A cleaning device body floating on the water surface in a container, and a first device attached to this cleaning device body and moving the cleaning device body in a direction towards and away from the inner surface of the container.
a propulsion mechanism; a second propulsion mechanism that is attached to the cleaning device main body and moves the cleaning device main body in a horizontal direction along the inner surface of the container; a brush main body that is connected to the washing device main body and slides on the inner surface of the container; and this brush main body. a rotating brush consisting of a casing that accommodates and supports a casing and is rotatable in a vertical plane; a drive mechanism that is installed in the cleaning device body and rotates the brush body of the rotary brush; and a drive mechanism that is installed in the cleaning device body and that rotates the brush body. a cleaning water injection mechanism that receives power from the drive mechanism through a brush, swings horizontally in synchronization with the rotational movement of the rotating brush, and sprays cleaning water onto the inner surface of the container; The suction port is located within the rotating brush, and the discharge port is connected to a drainage tube disposed up to the main body of the cleaning device, and wastewater containing pollutants is sucked through the suction port to the discharge port. A container inner surface cleaning device comprising: a sewage suction mechanism for discharging sewage into a drainage tube through the drain tube.