JPH0816719B2 - Clearance device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for collecting dust floating on the water surface such as a cooling pond of a nuclear power plant or a spent fuel storage pool.

[0002]

2. Description of the Related Art Spent fuel burned in a nuclear reactor is stored and cooled in a spent fuel pool. Here, on the side of the spent fuel pool, there is an entrance / exit for carrying in various devices, which is isolated from the outside by a door. By the way, the inside of the nuclear power plant is always under a negative pressure so as not to release radioactive substances to the outside of the controlled area, and air conditioning is performed.

However, when opening the door for transporting equipment, small dust (cotton dust, etc.) may fall on the pool water surface even if sufficient control is performed due to this negative pressure. was there. When these dusts float on the surface of the water for a long time, they absorb water and sink to the bottom of the pool to become sludge.

In order to prevent this, the spent fuel pool is provided with a purification device for water stored therein.
FIG. 4 is an explanatory view showing an outline of a conventional stored water purification device, which is installed as a facility of the spent fuel pool 1 as shown in the figure, and is installed near the water surface of the spent fuel pool 1. Dust flows into the suction port 2 together with water and is filtered while leaving only dust in the filter 3. The filtered water is returned to the pool 1 by the pump 4 via the discharge pipe 5.

[0005]

However, since the purification device installed in the pool is installed as a facility of the pool, the construction cost is high. Furthermore, since the floating dust on the entire surface of the pool is to be sucked, a suction pump with a large capacity is required. On the other hand, there are no floating substances that hinder plant operation to the extent that they must be collected at all times, and recently a filter has been added to the spent fuel pit purification system to improve the pit purification capacity. Therefore, the need for large purification devices is decreasing.

According to the present invention, even in a place where harmful radioactivity is held inside a cooling pond, a storage pool or the like of a nuclear power plant, the dust floating on the water surface can be collected well and a small capacity can be obtained. The purpose is to obtain a device that can be collected by a pump.

[0007]

In clearance apparatus according to the present invention the means for solving problem] includes a suction means for sucking the floating dust with water on the water surface of the deployed cooling pond and storage pool in a nuclear power plant, the
Filter means for scooping up dust that is sucked together with water,
Drainage means for discharging the water filtered by the filter means
In the provided skimmer device, the skimmer device main body
An externally movably mounted trolley, a fixed end fixed near the main body of the skimmer device and floatingly installed on the water surface, and a desired area of the water surface that surrounds the fixed end and is connectable to the fixed end side. And a bendable floating fence having a free end.

Further, specifically, a flexible suction hose in which the suction means can move a suction port to a desired place in a region surrounded by the floating fence, and a float attached near the suction port. It is what discloses that equipped with.

[0009]

In the present invention, one end of the floating fence is fixed near the main body of the skimmer device, and the other end is a free end operable so as to surround a desired region on the water surface. For example, grab the free end with a long stick and move along the wall of the pool to collect floating debris from the pool within the area of the floating fence. In this case, the minimum length of the floating fence varies depending on the size and shape of the pool and the installation location, but if it is a rectangular shape like a general pool, install the clearance device at the center of the longitudinal width of the rectangle. For example, the length from that position to the diagonal apex is sufficient.
With the floating fence with this free end, the operator only has to go around the cooling pond / storage pool of the nuclear power plant that holds harmful radioactivity inside, and safely float the floating debris on the water surface to the desired area. It can be surrounded by scanning, and the dust can be collected in a short time by guiding the suction means to the inside surrounded by the floating fence or by guiding the area surrounded by the floating fence to the suction means.

In the present invention, the main body of the skimmer device is moved.
Since it is mounted on a trolley that can
Used anywhere on the shore of a deployed cooling pond or storage pool
It is possible. The suction means may be an existing suction device or may be newly provided. Further, the suction capacity may be such that the dust floating on the water surface in the area surrounded by the floating fence can be sucked together with water.

As a suction means of an embodiment described later, a flexible suction hose capable of moving the suction port to a desired place in a region surrounded by a floating fence, and a float attached near the suction port are provided. If it is one, it can be guided freely into the area surrounded by the floating fence, and the suction operation can be performed well.

[0012]

1 is a plan view showing the structure of an embodiment of the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a plan view of the apparatus of FIG. 1 applied to a spent fuel pool. Is. As shown in the figure, this skimmer device has a suction pump 12 on a carriage 11.
It is composed of a skimmer device body 10 provided with a filter 13 and a floating fence 22 having one end fixed to the skimmer device body 10.

The suction pump 12 is equipped with a suction hose 16 having a suction port 15 to which a suction float 14 is attached and capable of sucking water and dust near the water surface together. The dust and water are guided to the filter 13. In addition to the suction float 14, a float 17 for floating the suction hose 16 is attached.

The filter 13 has a cartridge-type filter mounted inside a cylindrical filter container 20 having a discharge pipe 19 of a suction pump 12 attached to a lid 18, and dust introduced along with water by a suction hose 16. The water that has been removed by this filter passes through the drainage pipe 21 at the bottom of the filter and is discharged from the drainage port introduced into the pool. The filter is a cartridge type and can be easily replaced.

A floating fence 22 (trade name: Bruce SA type (manufactured by Takashina Lifesaving Equipment Co., Ltd.)) made of a floating flexible resin extends from the main body 10 of the skimming device toward the pool and has a supporting angle 23. It is fixed at one end. On the other hand, the other end of the floating fence is a free end that is not fixed anywhere, and this free end is provided with a wheel 24 so that it can be freely operated by a handling pole 30 having a hook-shaped tip. ing.

One method of collecting dust in the cooling pond / storage pool of a nuclear power plant, which has harmful radioactivity inside, by using the above-mentioned device is as follows. (1) Set the clearance device at the specified position on the pool side.
The central part of the pool is suitable so that the floating fence can reach the edge of the pool. (2) Attach one end of the floating fence to the support angle. (3) Float the floating fence in the pool. (4) Float the suction float on the pool and connect the suction hose to the suction pump. (5) Use the handling pole to run the free end of the floating fence along the wall of the pool, collect the floating debris on the water surface in the pool near the suction port, and fix the end to the support angle as well.
Close the fence. (6) Start the suction pump to suck floating dust with water. (7) At this time, the suction float can be moved to an arbitrary dust position with the handling pole. (8) The replacement of the filter router is completed by opening the cover of the filter container, replacing the cartridge-type filter router bag, and closing the cover of the filter container. (9) Incinerate the filter bag together with the collected garbage.

As described above, one end of the floating fence is fixed near the main body of the skimmer, and the other end is a free end that can be operated so as to surround a desired area on the water surface. By moving around and collecting the floating debris of the pool in the area of the floating fence, the operator only has to go around the cooling pond / storage pool of the nuclear power plant which has harmful radioactivity inside, and it is safe. It is possible to scan and enclose floating debris on the water surface in a desired area, and collect the debris by guiding the suction means inside the floating fence or by guiding the area surrounded by the floating fence to the suction means. Can be done in a short time.

Since a predetermined area is surrounded by a floating fence to suck dust, a pump having a small capacity can be used.
For example, the pump capacity of the existing water purifier is about 400 liters / min, but it is smaller than this, for example, 10
A volume of 0 to 200 liter / min is also possible. Also, since the device is mounted on a dolly, it can be used at any place. Furthermore, since the floating dust is collected by using the floating fence, it is possible to easily move the dust in the place where the dust cannot be sucked by the existing water purification device, such as the corner of the pool, to the suction port. Further, since the cartridge type filter bag is used, the filter can be easily replaced.

[0019]

As described above, the floating fence having the fixed end fixed near the main body of the skimmer and the free end operable to surround a desired area on the water surface, and the floating fence is surrounded by the floating fence. A suction means for sucking the dust floating on the water surface of the region together with the water, a filter means for scooping the dust sucked together with the water, and a draining means for discharging the water filtered by the filter means are provided. Therefore, for example, the free end is grabbed by a long rod, and the floating dust in the pool is sucked by collecting along the wall surface of the pool and sucking the floating dust in the area of the floating fence, so that the dust can be safely collected in a short time.
Also, a suction pump with a small capacity can be used.

[Brief description of drawings]

FIG. 1 is a plan view showing the configuration of an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a plan view of the apparatus of FIG. 1 applied to a spent fuel pool.

FIG. 4 is an explanatory diagram showing an outline of a conventional water purification device.

Claims (2)

[Claims] 1. A suction hand the stray dust on the water surface of the deployed cooling pond and storage pool in a nuclear power plant sucking with water
Stage and a filter for scooping up dust that is sucked together with the water
Means and drainage for discharging the water filtered by the filter means
In a skimmer device including a means, a stand on which the skimmer device body is movably mounted outside the water surface
It is fixed near the car and the main body of the skimming device and installed floating on the water surface.
The fixed encloses a desired area of the fixed end and the water surface is
A skimmer device comprising a bendable floating fence having a free end connectable to an end side . 2. The suction means includes a flexible suction hose capable of moving a suction port within a region surrounded by the floating fence, and a float attached near the suction port. The clearance device according to claim 1 .