JPH0260279B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a decontamination device for a nuclear power plant, and more particularly to a decontamination device using a spray for boots for a nuclear power plant.

[Prior art]

Traditionally, commonly used boots and shoes,
When attempting to wash a large amount of clothes at once, a rotating drum type washing machine, such as that used for industrial washing of clothes, has been used. In this type of washing machine, the items to be washed are placed in a drum partially immersed in a cleaning liquid and washed while rotating. Therefore, when attempting to clean boots used at a nuclear power plant, the cleaning solution enters the inside of the boots, which are free from radioactive contamination, and the inside can be contaminated by contaminants suspended in the cleaning solution. I'm worried about being exposed. If an attempt is made to prevent this, a large amount of clear rinsing liquid is required, resulting in the problem of increased generation of secondary waste.

Therefore, as a method of cleaning the items to be washed without completely immersing them in liquid, it is possible to apply cleaning apparatuses using various sprays that are widely used in other fields. For example, as a washing machine for tableware, a device was devised that uses a rotating nozzle arm to efficiently spray wash each part of the dishes being washed (Japanese Patent Application Laid-Open No. 1989-1999).
-61072) Application of such a device is also considered.

However, in the case of nuclear power plant boots, when workers walk on contaminated floors, the soles of the boots are rubbed strongly against the contaminated surfaces and become dirty. Difficult to dye.

Therefore, when attempting to decontaminate boots for nuclear power plants using the conventional techniques, there are problems in that the interior is likely to be backstained, or the dirt on the bottom surface cannot be removed, resulting in a poor decontamination effect.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a decontamination device for nuclear power plant boots that eliminates the above-mentioned drawbacks of the prior art, eliminates the risk of back contamination, and effectively decontaminates the soles of boots.

[Summary of the invention]

First, in order to wash the boots without recontaminating them, the boots are placed upside down on a columnar support and washed by passing through a zone where cleaning liquid is sprayed from above and below and from the left and right.
A turntable method is used to drive the boots, that is, a support for the object to be washed is placed on the outer periphery of the turntable, and while the turntable is rotated, it passes through the sprayed zone.

This prevents fluids containing contaminants from entering the largely clean inner surface of the boot.

Next, cleaning with a rotating brush is also used to clean the bottom surface which is noticeably dirty. A rotating brush having an axis in the same direction as the radius of the turntable is installed on the sole of the boots, and when the boots are moved by the turntable, cleaning is performed by the rotating brush.

Furthermore, an inclined plate is provided at a position slightly lower than the sole surface of the boots between the boots installed on the turntable so that the cleaning liquid is sufficiently supplied to the rotating brush. As a result, when the sprayed liquid from the nozzle facing vertically downward does not hit the sole of the boots, it hits the inclined plate and is reflected and sprayed onto the rotating brush.

[Embodiments of the invention]

FIG. 1 shows a front view of a decontamination device for nuclear power plant boots, which is an embodiment of the present invention. Also, Figure 2 is a plan view, Figure 3 is a front view of the rotating brush and inclined plate,
Furthermore, FIG. 4 shows a side view of the rotating brush and the inclined plate.

The decontamination device for nuclear power plant boots shown in the example includes a decontamination tank 1, a spray nozzle 2, a nozzle pipe 3, a turntable 4, a turntable rotation shaft 5, a turntable rotation motor 6, a cleaning liquid extraction pipe 7, and a rotating brush. 8, a rotary brush shaft 9, a rotary brush motor 10, an object support 11, an inclined plate 12, and a loading/unloading port 13.

Nuclear power plant boots 14, which are items to be washed, are carried in from the carry-in/out port 13 of the decontamination tank 1 while being attached to the support body 11, and are placed on the turntable 4.
This operation is performed using conveyance equipment such as a conveyor.

Here, the object support 11 has a structure in which a large-mesh mesh material is cylindrical and erected like a pillar, and is supported by being inserted into the trunk of a boot. Therefore, the boots 14 are in a state with the bottom facing upward.

A plurality of boots 14 are installed on the turntable 4 as shown in the plan view of FIG. That is,
Each boot is installed so that the line connecting the toe and heel is approximately in the radial direction of the turntable. At this time, the inclined plate 12 attached to the turntable 4 is positioned between the boots.

When a certain number of boots 14 are placed on the turntable 4, the loading/unloading port 13 is closed and cleaning is started.

First, the turntable 4 is rotated at a constant speed in the opposite clockwise direction as shown in FIG. begins. The cleaning liquid 15 may be either a solvent or water.

Cleaning liquid 15 is sprayed from nozzle 2. The nozzle 2 is installed to spray from the top and bottom and from the radial direction of the turntable 4, and the nozzle 2 is a flat type that sprays liquid in a flat fan shape. Cleaning is performed by allowing the boots 14 to pass through the liquid film (spray zone) while riding on the turntable 4. The injection pressure of the cleaning liquid 15 in the nozzle 2 varies depending on the contamination state of the object to be washed, but is operated in the range of 3 to 50 kg/cm ² . The cleaning effect is improved by increasing the number of nozzles that spray from the front and back of the turntable 4 in the radial direction and by spraying at an angle.

Cleaning in such a state is performed as follows.

The boot 14 passes through the spray zone in the opposite clockwise direction in FIG. 2 while resting on the turntable 4. At this time, dirt adhering to the bottom, instep, and top of the body are peeled off and washed away by the impact force of the spray droplets. A cleaning solution is sprayed from a lower nozzle onto the inside of the boots to clean them.

When the position of the boots moves from the spray zone,
The spray emitted from the upper and lower nozzles hits the inclined plate 12. The cleaning liquid sprayed from above is reflected by the inclined plate 12 and bounced back onto the rotating brush 8. At the same time, the boots 14 move the rotating brush 8
The rotary brush 8 removes dirt strongly adhered to the bottom surface and washes it away together with the cleaning liquid adhering to the brush.

The turntable 4 rotates further, and the boots 14 completely pass under the rotating brush 8. The plurality of boots 14 undergo the above operations one after another.

When the turntable rotates 3 to 5 times, the dirt adhering to the surface is completely removed and discharged from the cleaning liquid outlet 7, completing the cleaning. The boots 14 after washing are
It is dried by blowing warm air into the decontamination tank 1.

According to the embodiment of the present invention, since a turntable is used to move the boots, the driving is simple and the seal can be made completely, so that a solvent such as chlorofluorocarbon can be easily used as a cleaning liquid. Also, since cleaning is performed by removing the rain boots into the spray zone, the number of nozzles can be kept to a minimum.

Further, since the cleaning liquid can be easily supplied to the rotating brush, the rotating brush can also be cleaned.

According to the embodiments described above, more than 90% of the dirt attached to the boots can be removed on average, making decontamination possible. Additionally, there is no evidence of contaminants entering the inside of the boots.

〔Effect of the invention〕

According to the present invention, the inner surface of the boots for nuclear power plants, which is hardly contaminated by radioactive substances, is unlikely to be back-contaminated, and the soles of the boots, which are heavily rubbed with dirt, can be cleaned extremely well.

[Brief explanation of the drawing]

FIG. 1 is a front view of one embodiment of the nuclear power plant boot decontamination device of the present invention, FIG. 2 is a plan view, and FIGS. 3 and 4 are front and side views of a rotating brush portion. 1...Decontamination tank, 2...Spray nozzle, 3...
Nozzle pipe, 4... Turntable, 5... Turntable rotating shaft, 6... Turntable rotating motor, 9... Rotating brush shaft, 10... Rotating brush motor, 11... Washed object support.

Claims (1)

[Claims] 1. In a decontamination device used at a nuclear power plant that contacts the surface of boots with a cleaning solution and sprays to clean contaminated matter adhering to the surface, a turntable that rotates horizontally in a decontamination tank; A plurality of inverted insertion supports for the objects to be washed are arranged radially around the outer periphery of the turntable, a nozzle pipe attached to the tank body so as to surround the supports for the objects to be washed at the top and bottom, and a nozzle pipe attached to the tank body, A decontamination device for nuclear power plant boots, characterized by comprising a rotating brush attached in the radial direction to the upper part of the boot.