KR101512654B1 - Washing system for chamber contaminated with radioactivity - Google Patents

Abstract

The present invention relates to a cleaning device for a radioactive contamination measuring chamber including an underwater radiation measuring device capable of monitoring radioactivity with respect to water quality of a water facility.
The present invention relates to a measuring chamber for measuring water activity in water; A wash water supply device including a wash water storage tank for storing pure water, a wash water supply valve, a supply pump for supplying wash water to the measurement chamber, and a flow rate regulator for regulating the flow rate of the wash water; And a control unit connected to control the operation of the contaminated water discharge unit and the measurement chamber, the wash water supply unit, and the polluted water discharge unit for discharging the contaminated water to the contaminated water storage tank.
According to the present invention, it is possible to secure safety for use as drinking water and industrial water, to improve accuracy in the next radioactivity measurement, to easily grasp the completion of washing by the control unit, to prevent excessive use of washing water, The operation efficiency can be improved by the flow regulator, and the risk of the human body being exposed to radioactivity can be reduced by enabling unmanned operation.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cleaning apparatus for a radioactive contamination chamber,

The present invention relates to a cleaning apparatus for cleaning a contamination chamber, and more particularly, to a cleaning apparatus capable of rapidly cleaning a measurement chamber when an internal radioactive concentration of a measurement chamber capable of measuring in-water activity is higher than a reference value.

In order to manage water resources efficiently, a monitoring system has been established for water pollution assessment and monitoring from water sources, water intake facilities and water purification facilities.

However, recently, since the radioactive material of the Fukushima nuclear plant has been detected in Japan since the earthquake in Japan, the contaminated area has been spreading. Therefore, there is a demand for a method and apparatus for monitoring the radioactive contamination of the water quality.

When the radioactivity is detected above the reference value as a result of the water quality measurement, it is required to clean the measurement device in order to improve the measurement accuracy in the next measurement and make the water quality measurement possible again.

Korean Utility Model Registration No. 0252220 discloses an apparatus for cleaning residual organic fluorescent radiation material in a container, which is used for removing an organic fluorescent radiation material (hereinafter abbreviated as "waste liquid") from a container, A compressor having a regulator for supplying pneumatic pressure, a nozzle for removing a waste liquid by placing a container to be cleaned upside down, a compressor is operated, air supplied is mixed with a cleaning liquid such as alcohol or decontamination liquid, And discharges the waste liquid of the container placed in the nozzle.

However, in the conventional cleaning apparatus, there is no description of an apparatus for rapidly cleaning the radioactive material immediately after confirming the contamination by checking the radioactive contamination in real time, and there is no device for measuring and analyzing the radioactive contamination degree as the washing progresses, And it is difficult to efficiently use the washing water because a large amount of water must be used in order to completely wash away the waste liquid.

Disclosure of Invention Technical Problem [8] The present invention has been proposed in order to solve the above problems, and it is an object of the present invention to provide an apparatus and a method for rapidly cleaning a measurement chamber and preventing the use of contaminated water when a measurement chamber for measuring water activity is contaminated with radioactivity above a reference value And a cleaning device for the radioactive contamination measuring chamber.

In order to solve the above problems, the present invention provides a washing machine comprising: a washing water storage tank for storing wash water for washing a measurement chamber in which water activity is measured;

A wash water supply valve disposed on a pipe connecting the wash water storage tank and the measurement chamber to supply / block the wash water;

A supply pump disposed on the pipe for supplying the wash water to the measurement chamber;

And the washing water is supplied to the measuring chamber by opening the washing water supply valve to wash the measuring chamber, and the washing water is supplied to the measuring chamber,

And a control unit for driving the washing water supply unit until the radioactive concentration of the measurement chamber reaches a reference value by measuring the radioactive concentration of the measurement chamber even during the washing.

The present invention also relates to a measuring chamber for measuring the radioactivity of water supplied from a water source;

A water supply unit connecting the inlet side of the measurement chamber and the water source to supply water stored in the water source to the measurement chamber;

A controller for analyzing the radiation data transmitted from the measurement chamber and determining whether the reference value is exceeded;

A wash water supply unit for supplying wash water to the measurement chamber according to a signal of the control unit when a result of determination by the control unit exceeds a reference value;

A polluted water discharge portion for storing the polluted water discharged from the measurement chamber; And

And a flow controller for regulating the flow rate of the washing water supplied to the measuring chamber,

The control unit receives water by driving a pump of the water supply unit by transmitting a signal to a water supply unit, a measurement chamber, a wash water supply unit, and a polluted water discharge unit, and controls the water supply unit and the water supply unit according to whether the measured radiation data of the measurement chamber exceeds a reference value. Selectively supplying or shutting off the water supplied from the wash water supply unit to the measurement chamber, discharging or blocking the water in the measurement chamber to the contaminated water discharge unit,

And the radioactive concentration of the measurement chamber is measured during cleaning by the cleaning water supply unit, thereby driving the cleaning water supply unit until the radioactive concentration of the measurement chamber reaches a reference value.

The apparatus for cleaning a radioactive contamination chamber according to the present invention has the following advantages.

First, in case of pollution more than the reference value in the measurement chamber, the polluted water is automatically discharged to the polluted water discharge part, thereby separating the polluted water and taking water cutoff measures, thereby securing safety for use as drinking water and industrial water. And can be cleaned to improve accuracy in subsequent radioactivity measurements.

Second, the control unit controls the cleaning of the measurement chamber until the radiation level of the measurement chamber becomes the same as the surrounding environment value, so that the completion of the cleaning can be grasped easily, and the excessive use of the washing water can be prevented.

Third, since the washing water is supplied using the raw water feed pump and the line, it is possible to wash not only the measuring chamber but also the whole piping line.

Fourth, a detailed analysis of radionuclides can be made by reanalyzing the polluted water stored in the polluted water storage tank.

Fifth, it is possible to increase the flow rate of the wash water when the radioactive contamination degree of the measurement chamber is high, and to reduce the flow rate when the contamination degree is low, thereby improving the use efficiency of the wash water.

Sixth, the unmanned operation is possible by the control unit, and the risk of exposure of the human body to radiation during the washing process is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram schematically showing a cleaning apparatus for cleaning a radioactive contamination chamber in an automatic radioactivity measuring and monitoring system according to an embodiment of the present invention,
2 is a conceptual view showing the principle of a three-way valve in a flow regulator according to an embodiment of the present invention,
FIG. 3 is a diagram showing the structure of the control unit shown in FIG. 1,
4 is a view showing an ultrasonic generator according to another embodiment of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an automatic radiation measurement and monitoring system to which a measurement chamber cleaning apparatus proposed by the present invention is applied.

As shown, the automated radiometric measurement and monitoring system comprises a metering chamber 15 for measuring the radioactivity of water; A water supply part (5) for collecting water from a water source by a pump; A wash water supply device 50 connected to the measurement chamber 15 and supplying wash water to the measurement chamber 15 when the radiation level above the reference value is detected and contaminated in the measurement chamber 15; A polluted water discharging portion 60 connected to the measuring chamber 15 and discharging the contaminated water having a radioactivity level higher than the reference value detected in the measuring chamber 15 to the contaminated water storage tank; A control unit 9 connected to control the operation of the measurement chamber 15, the wash water supply unit 50, and the polluted water discharge unit 60; And a transmission / reception unit 10 capable of transmitting / receiving data of the control unit 9 to / from the server S by wire / wireless.

The measurement chamber 15 is supplied with the water (sample) collected from the water supply unit 5 and stored, and the radioactivity of the sample is measured by a measurement sensor capable of measuring the radioactivity.

The water supply unit 5 collects a predetermined amount of water as a sample from a water source such as a water / water purification plant or a water source such as a river, a lake, or a dam, filters the water, and supplies the water to the measurement chamber 15.

The control unit 9 determines the degree of contamination in accordance with the measurement of the underwater activity of the measurement chamber 15 and outputs the contaminated sample to the contaminated water discharge unit 60 and the measurement chamber 15 And a controller 47 which can be controlled so as to be cleaned.

1 to 3, the controller 9 includes a logger unit 39 for classifying and analyzing the radiation concentration data transmitted from the measurement sensor 33 into nuclear species;

A storage unit (41) for storing data processed by the logger unit (39);

An alarm unit 45 for generating an alarm when the radioactive concentration exceeds a reference value;

A PLC (programmable logic controller) 47 for controlling the system by transmitting and receiving signals with the units, determining whether the data exceeds a reference value, and instructing the storage of data.

In the control unit 9 having such a structure, the control unit 9 classifies and classifies the radiation data measured by the measurement sensor 33 in the measurement mode into iodine data and cesium data, Analyze the intensity and radioactivity, respectively.

Further, the logger unit 39 measures the environmental data around the measurement chamber 15 and sets the radiation baseline value (Background limit). At this time, it is preferable that the measurement of the radioactive basis value is made for iodine and cesium.

The data analysis result is transmitted to the controller 47. The controller 47 provides the data to the storage unit 41 and stores the data in the storage unit 41. The controller 47 determines whether the reference value is exceeded by the judgment program of the controller 47 itself.

The controller 47 compares the reference value set for each type of radioactive nucleus with the actual radiation concentration data of the measurement chamber 15 received from the logger unit 39 so that the measurement chamber 15 It means that the measurement chamber 15 is contaminated.

Therefore, the signal is sent to the sample supply valve (V1) to be closed so as to prevent the sample from being additionally supplied to the measurement chamber (15).

Then, the controller 47 sends the washing water to the measuring chamber 15 by sending a signal to the washing water supplying device 50, so that the contaminated radioactive material can flow out of the measuring chamber 15.

The wash water supply device 50 includes a wash water storage tank 52 for storing demineralized water as wash water for washing the contaminated measurement chamber 15; A wash water supply valve (V2) disposed on the pipe connecting the wash water storage tank (52) and the measurement chamber (15) to supply / block the wash water; A supply pump 13 disposed on the pipe for pumping the wash water stored in the wash water storage tank and supplying the wash water to the measurement chamber 15; And a flow regulator 21 disposed at the entrance of the measurement chamber 15 for regulating the flow rate of the wash water.

The flow rate regulator 21 is connected to the control unit 9 and driven by a control signal to increase the flow rate of the wash water when the radioactive contamination degree of the measurement chamber 15 is severe and to reduce the flow rate when the contamination degree is low, .

The flow regulator 21 is preferably a three-way valve type. More specifically, the flow regulator 21 includes a suction port 23 connected to a pipe L to which a sample or wash water is supplied; A first outlet 25 for discharging the supplied sample to the measurement chamber 15; A second outlet 27 for discharging the supplied sample to the bypass pipe L1; And an opening / closing plate 29 hingedly provided inside the flow regulator 21 for selectively opening and closing the first and second outlets 25 and 27.

The flow rate regulator 21 having such a structure can appropriately adjust the flow rate of the sample or the washing water by varying the opening angle of the opening and closing plate 29 according to the control signal of the controller 9. [

The contaminated water discharging part 60 includes a contaminated water discharge valve (not shown) for discharging the contaminated water or the washed water having a radiation level above the reference value detected in the measurement chamber 15 to a separate contaminated water storage tank V3); And a polluted water storage tank 62 for storing the discharged polluted water or cleaned water.

At this time, after the contaminated sample flows out from the measurement chamber 15, the controller 47 can open a pipe connected to the contaminated water storage tank 62 by transmitting a signal to the contaminated water discharge valve V3. Therefore, the sample flowing out of the measurement chamber 15 is supplied to the contaminated water storage tank 62 and stored.

The polluted water stored in the polluted water storage tank 62 can be analyzed again to analyze the radionuclide in detail.

The washing water supply valve V2 and the contaminated water discharge valve V3 are solenoid valves which are opened and closed by an electric signal of the control unit 9 and are connected to the water supply valve V2 and the contaminated water discharge valve V3, The pump 13 may be controlled by the controller 47.

As described above, the cleaning device of the radioactive contamination measuring chamber is an unmanned automatic cleaning system that operates under the control of the control unit 9 and can supply cleaning water to the measurement chamber for cleaning.

Further, since the washing water is supplied using the raw water feed pump and the line (L), it is possible to wash the entire piping line as well as the measuring chamber (15).

4, as another preferred embodiment of the present invention, the cleaning device 50 of the radioactive contamination measuring chamber further includes an ultrasonic generator 70 provided under the measurement chamber 15 can do.

The ultrasonic generator 70 may be controlled by the controller 47 (FIG. 3) by being connected to the controller 9 (FIG. 1).

1) and the supply pump 13 (Fig. 1) are driven by the signal of the control unit 9 (Fig. 1), the cleaning operation for the measurement chamber 15 is proceeded. 3) transmits a signal to the ultrasonic generator 70 as well.

The ultrasonic generator 70 generates an ultrasonic wave having a predetermined frequency by this signal.

Such ultrasonic waves are made into smaller fine particles by vibrating the foreign substances contained in the contaminated water in the measurement chamber 15, and these fine particles can be easily floated, and the water in the measurement chamber 15 As shown in Fig.

In addition, foreign matter adsorbed on the inner wall surface 72 of the measurement chamber 15 can be easily separated from the wall surface by ultrasonic waves, and can be discharged to the outside by the washing water.

At this time, the ultrasonic cleaning is mainly performed by the cavitation phenomenon of the ultrasonic wave. The cavitation phenomenon is caused by the large pressure change of the ultrasonic wave when the ultrasonic wave is propagated into the solution, and the microcavity is generated and disappears. These pressures and high temperatures occur in a fraction of a second to a few thousandths of a second. This powerful force disperses and decomposes pollutants and maximizes the cleaning effect of the wash water, thus shortening the cleaning time and allowing the next radioactivity measurement to be carried out quickly.

In the present invention, by using pure water in the cleaning process, cavitation is less likely to occur as the viscosity of the solution increases in the ultrasonic cleaning, dissolved oxygen dissolved in the solution weakens the cavitation strength, thereby improving the cleaning effect, Can be reduced.

Hereinafter, a cleaning method of the radioactive contamination measuring chamber using the cleaning apparatus of the radioactive contamination measuring chamber of the present invention will be described.

As shown in Figs. 1 to 4, when the radioactive concentration in the water measured by the measurement sensor 33 provided inside the radiation measurement chamber 15 is analyzed above the reference value, Because it is contaminated with radioactivity, it can not be sent back to the reservoir like normal water.

Therefore, the contaminated water needs to be separately stored for analysis. The contaminated water discharge valve V3 is opened by the signal of the controller 47, and the discharged water is discharged to the contaminated water discharge portion 60.

Then, the sample supply valve V1 is shut off by the signal of the controller 47, the washing water supply valve V2 is opened, and the supply pump 13 is driven.

Therefore, pure water stored in the wash water storage tank 52 is supplied to the measurement chamber 15 and starts washing.

At this time, the measurement sensor 33 continuously measures the radioactivity concentration in the measurement chamber 15 in the process of washing.

Therefore, the control unit 90 automatically thoroughly cleans the interior of the measurement chamber 15 by keeping the water supply valve V2 in the open state until such radiation data is maintained at the same level as the surrounding environment value.

In addition, when the ultrasonic generator 70 is washed, the ultrasonic wave generator 70 generates ultrasonic waves having a predetermined frequency, so that foreign substances in the contaminated water can be made into fine particles or the foreign substances adsorbed on the inner wall surface of the measurement chamber 15 can be separated.

Therefore, the cleaning operation for the measurement chamber 15 can be performed more efficiently.

The polluted water discharge valve V3 is opened so that the contaminated water in the measurement chamber 15 can be discharged to the contaminated water storage tank 62 and stored. Further, a detailed analysis of the radionuclide can be performed by re-analyzing the polluted water stored in the polluted water storage tank 62.

When the washing operation for the measuring chamber 15 is completed in this way, the sample supply valve V1 is opened again, and a new sample is supplied from the water source to the measuring chamber 15 by operating the supplying pump 13, The measurement process can be repeated.

1: Automatic measurement and monitoring system of radiation
5:
7: Measurement chamber
9:
50: Wash water supply device
60:
70: Ultrasonic generator

Claims (4)

A measuring chamber for measuring radioactivity of water supplied from a water source;
A washing water storage tank for storing wash water for washing the measurement chamber;
A wash water supply valve disposed on a pipe connecting the wash water storage tank and the measurement chamber to supply / block the wash water;
A supply pump disposed on the pipe for supplying the wash water to the measurement chamber;
A flow regulator disposed at an inlet side of the measurement chamber for regulating a flow rate of the wash water;
And the washing water is supplied to the measuring chamber by opening the washing water supply valve to wash the measuring chamber, and the washing water is supplied to the measuring chamber,
And a control unit for driving the wash water supply unit to supply wash water to the measurement chamber until the radiation concentration of the measurement chamber reaches a reference value by measuring the radiation concentration of the measurement chamber even during cleaning,
Wherein the measurement chamber is provided at one side of the measurement chamber and is supplied with water; A sample discharge port provided on the other side of the measurement chamber to discharge the measured sample; And a measurement sensor positioned between the sample inlet and the sample outlet in the measurement chamber to measure the radioactive concentration of the sample while being immersed in the sample and transmit the measured radioactive concentration to the control unit,
Wherein the flow rate regulator includes: a suction port connected to a pipe through which the wash water is supplied; A first outlet for discharging the supplied wash water to the measurement chamber; A second outlet for discharging the supplied washing water to the bypass pipe; And an opening / closing plate hingably provided inside the flow controller to selectively open / close the first and second outlets,
The control unit may include a logger unit for measuring environmental data around the measurement chamber to set a radiation baseline value and sorting / analyzing the radiation concentration data transmitted from the measurement sensor into nuclear species; A storage unit for storing data processed by the logger unit; An alarm unit for generating an alarm when the radioactivity concentration exceeds a reference value; A controller for controlling the system by sending and receiving signals to and from the units, determining whether the data exceeds a reference value, instructing storage of the data, and controlling the washing of the measurement chamber Device. The method according to claim 1,
Further comprising an ultrasonic generator in the measurement chamber,
Wherein the ultrasonic generator is controlled by a control unit to generate ultrasonic waves when the wash water supply valve is opened. A measuring chamber for measuring radioactivity of water supplied from a water source;
A water supply unit connecting the inlet side of the measurement chamber and the water source to supply water stored in the water source to the measurement chamber;
A controller for analyzing the radiation data transmitted from the measurement chamber and determining whether the reference value is exceeded;
A wash water supply unit for supplying wash water to the measurement chamber according to a signal of the control unit when a result of determination by the control unit exceeds a reference value;
A polluted water discharge portion for storing the polluted water discharged from the measurement chamber; And
And a flow controller for regulating the flow rate of the washing water supplied to the measuring chamber,
Wherein the measurement chamber is provided at one side of the measurement chamber and is supplied with water; A sample discharge port provided on the other side of the measurement chamber to discharge the measured sample; And a measurement sensor positioned between the sample inlet and the sample outlet in the measurement chamber to measure the radioactive concentration of the sample while being immersed in the sample and transmit the measured radioactive concentration to the control unit,
Wherein the flow rate regulator includes: a suction port connected to a pipe through which the wash water is supplied; A first outlet for discharging the supplied wash water to the measurement chamber; A second outlet for discharging the supplied washing water to the bypass pipe; And an opening / closing plate hingably provided inside the flow controller to selectively open / close the first and second outlets,
The control unit may include a logger unit for measuring environmental data around the measurement chamber to set a radiation baseline value and sorting / analyzing the radiation concentration data transmitted from the measurement sensor into nuclear species; A storage unit for storing data processed by the logger unit; An alarm unit for generating an alarm when the radioactivity concentration exceeds a reference value; And a controller for controlling the system by transmitting and receiving signals to and from the units, determining whether the data exceeds a reference value, instructing storage of the data, and controlling the washing of the measurement chamber, A water supply unit for supplying water to the measuring chamber, the washing water supplying unit and the contaminated water discharging unit to drive the pump of the water supplying unit to collect water, Selectively supplying or shutting off the water to be supplied, discharging or shutting the water in the measurement chamber to the contaminated water discharge portion,
And measuring the radioactive concentration of the measurement chamber during cleaning by the cleaning water supply unit to drive the cleaning water supply unit until the radioactivity concentration of the measurement chamber reaches a reference value. The method of claim 3,
The washing water supply unit
A washing water storage tank for storing wash water for washing the measurement chamber in which the radioactivity in water is measured;
A wash water supply valve disposed on a pipe connecting the wash water storage tank and the measurement chamber and supplying / blocking the wash water according to a signal of the control unit;
And a supply pump disposed on the piping and supplying wash water to the measurement chamber in response to a signal from the control unit.

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