JPS58195133A - Water discharging device capable of detecting leakage - Google Patents

Abstract

PURPOSE:To enable the detection of small leakage as well, by detecting the small leakage with a leak water receiver provided on the floor surface of a drain sump and a solenoid valve and a flowmeter connected thereto, detecting on one hand, a large leakage with a large leakage detector provided to a prescribed position and raising an alarm. CONSTITUTION:A leak water receiver 6 of a small diameter is provided to the lowest position on the inclined floor surface 2 of a drain sump installed with a tank 1 and is connected to a water discharge pipe 3. A solenoid valve 7 is provided to the midway of the pipe 3, and the lower side thereof is connected to a wall surface 3 by means of a bypass pipe 8. A flowmeter 9 is interposed below the confluence of the pipe 8 and the pipe 3 and a large leakage detector 10 and a small leakage detector 11 are installed in the drain sump. The detection signal S2 for large leakage from the detector 10, the detection signal S3 for small leakage from the detector 11 and the detection signal S4 for large leakage speed from the flowmeter 9 are inputted to a controlling and measuring circuit 12 by which the signals are operated and alarms are raised respectively according to the results thereof to announce the degree of the leakage. The detection of the small leakage is thus made possible and the expansion to rupture accident is prevented by the early discovery of the leakage.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a solution to prevent leakage from occurring in liquid tanks or piping.
The present invention relates to a leakage detection drainage device that can detect this at an early stage and measure the amount of leakage.

[Technical background of the invention]

At nuclear power plants, in the event of a leakage accident in the waste liquid tank or piping system, the leakage liquid can be prevented from spreading outside.
Must be discharged to wastewater treatment equipment.

Figure 1 shows an example of a M leakage detection drainage device installed in case of leakage from a tank.The floor 2 of the drain sump where the tank 1 is installed is an inclined surface, and the drain pipe opens at the lowest position. 6, the waste liquid leaked onto the floor is treated with a wastewater treatment system! (not shown).

A leak detector 5 is installed on the wall di14 at a predetermined level above the floor surface, and is configured to output a leak detection signal S1 when the lower end of the detecting part 5a is immersed in leaking water.

[Problems with background technology]

In conventional leakage detection and drainage devices, when a large amount of acid leaks from the tank 1, the level of leaked water on the floor 2 rises and the leakage can be detected by the leakage detector 5. In such a case, the leaked water would be immediately discharged from the drain pipe 6, so that the leakage could not be detected and countermeasures would be delayed, leading to a major rupture accident.

[Purpose of the invention]

The present invention has been made in order to eliminate the above-mentioned disadvantages in the prior art, and is capable of not only detecting large leaks but also reliably detecting small leaks and identifying the scale of the leak by measuring the amount of leak. The purpose is to provide a detection drainage device□.

Ru.

[Summary of the Invention]'' The leakage detection and drainage device of the present invention comprises: a leakage water receiver provided on the floor of a drain sump to collect leaked water; A solenoid valve and a flow rate a1 installed in the middle, a large leak detector installed so that the detection part is located at a predetermined level inside the drain sump, and a small leak detector installed so that the detection part is located inside the leak water receiver. Then, the large leak detection signal, small leak detection signal, and large leak speed detection signal from the flowmeter from these detectors are manually generated to generate the large leak 11 alarm signal, small leak alarm signal, valve opening/closing signal, and leak speed detection. It consists of a control measurement circuit that outputs signals.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail with reference to FIGS. 2 to 4.

In Figure 2, a small diameter leakage water receiver 6 is provided at the lowest position of the sloped floor surface 2 of the drain sump where the tank 1 is installed, and the upper end of the drain pipe 6 is opened at the bottom of the leakage water receiver 6 There is.

'1:1'.

A solenoid valve 7 is provided in the middle of the drain pipe 6, and
The lower side thereof and the drain sump wall surface 4 are connected by a pipe 1'; a bus pipe 8.

A flow meter 9 is inserted slightly below the junction of the bypass pipe 8 and the drain pipe 3.

A large leak detector 10 and a small leak detector 1 are installed in the drain sump.
1 is installed.

These detectors have a detection section 10m consisting of a pair of electromagnetic etc.
, 11 m, and the detecting section 11 of the small leak detector 11
The lower end of m is located within the leakage water receiver 6.

Further, the lower end of the detection section 10m of the large leakage detector 10 is located at the leakage detection level on the floor surface 2 in the drain sump.

Large leak detection signal S3 from large leak detector 10, small leak detection signal 8 from small leak detector 11. And the large leak rate detection signal S4 from the flow meter 9 is input to the control measurement circuit 12 and calculated, and the amount of the large leak alarm signal S, the small leak alarm signal S, the valve opening/closing signal S, and the leak rate detection signal S,
Output.

FIG. 6 shows an example of the configuration of the alarm signal circuit in the control measurement circuit 12.

In the figure, large leakage detection signal 8! is AND circuit 13.
14 and one input terminal of the OR circuit 15.

Further, the small leakage detection signal 8h is input to one input terminal of the AND circuit 16 and the NOT terminal of the AND circuit 13.17.

The output of the AND circuit 16 is led to the OR circuit 19 together with the output of the AND circuit 18, and the output of this OR circuit is sent to the delay circuit 2.
After passing through 0, it is input to the above-mentioned AND circuit 18 together with the reset signal 8°.

The output of the AND circuit 18 is also output from the AND circuits 16, 17, .
21 and the input terminal of the OR circuit 19.

The output signals from the AND circuits 16 and 21 pass through the OR circuit 22 and the delay circuit 23, and then are input to the AND circuit 24 together with the reset signals S, .

The output of this AND circuit 24 is the AND circuit 14.

17 and the other input terminal of the AND circuit 21.

The outputs of AND circuits 14 and 17 are led to OR circuit 25,
Outputs a small leak alarm signal S.

On the other hand, the output of the OR circuit 15 passes through the delay circuit 26 and is input to the AND circuit 27 together with the reset signal Stt, and the output thereof is applied to the other input terminal of the OR circuit 15.

The signal passed through the delay circuit 26 is a large leak alarm signal S.

The output will be closed.

FIG. 4 shows a configuration example of a valve opening/closing signal circuit and a leak rate detection signal circuit in the control measurement circuit 12.

In the figure, large leakage detection signal 8. and small leak detection signal S
, passes through the OR circuit 28, is led to the OR circuit 60 together with the output of the AND circuit 29, passes through the delay circuit 31, and is output as the valve opening/closing signal S.

The small leak detection signal S is guided directly and through the delay circuit 52 to an OR circuit 66, and the output of this OR circuit 33 is inputted together with the output of the delay circuit 31 to the aforementioned AND circuit 29.

Further, the small leakage detection signal Ss is generated by the AND circuit 34°65.
36 and the NOT terminals of AND circuits 57 and 38.

The output of AND circuit 39 is input to the other input terminal of AND circuit 65 and the NOT terminal of AND circuit S60, and the output of AND circuit 40 is input to the input terminals of AND circuits 57 and 58.

The outputs of the AND circuits 35 and 37 pass through the OR circuit 41 and the S extension circuit 42, and the small leakage detection signal S is sent to the AND circuit 6.
4, and the leak rate detection signal 8. Output.

The output of the delay circuit 42 is input to the input terminal of the AND circuit 69 together with the reset signal Stt.

Further, the output of the OR circuit 46 inputting the signals from the AND circuits 36 and 38 is input to the AND circuit 40 together with the reset signal StS after passing through the delay circuit 44.

Next, the operation of the leakage detection and drainage device of the present invention constructed as described above will be explained.

, f, 74, @ a o: l-, s , Q water 4 beds □ tsu 9 engineering The leaked water flows into the leak water receiver 6, but since the solenoid valve 7 is closed, the leaked water gradually flows into the leak water receiver 6. Tama'C
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When the liquid level in the leak water receiver 6 reaches a predetermined level L twice, the small leak detector 11 generates a small leak alarm signal S, and the measurement control circuit 12 outputs a valve open signal S to the solenoid valve 7. At the same time, a small leak alarm signal 8 is output.

When the drainage is finished and the small leak detector 11 is turned off, the solenoid valve 7 is automatically closed, but the small leak alarm signal S, continues to be issued, and the time until the small leak detector 11 is turned on again, that is, the leakage The time required to fill the water container 6 is measured.

This allows the leak rate to be measured.

Next, in the case of a large leak, the leaked water accumulates in the leak water receiver 6 and immediately overflows, causing the small leak detector 11 and the large leak detector 1 to
0 is turned on, the measurement control circuit 12 outputs an open signal S to the solenoid valve, and a large leak alarm signal S is output.
, is output.

At the time when the large leak alarm signal S, is issued, the small leak alarm signal 8e is turned off, indicating that the leak is a large leak.

In this case, the large leak alarm signal 8s continues to be output until the leakage water has been completely drained (until the reset signal is input.

Further, the leakage rate is measured by a flow meter 9.

〔Effect of the invention〕

As described above, according to the leak detection drainage device of the present invention, it becomes possible to detect small leaks that could not be detected up to now, so early detection can prevent the escalation to a breakage accident.

Additionally, the scale of a leakage accident can be determined by measuring the leakage speed.

Furthermore, the use of two leak detectors increases reliability and facilitates leak detection in locations that are difficult to access by humans.

Therefore, the monitor can reliably know whether there is a leak without being exposed to the risk of radiation exposure, and can take prompt countermeasures by knowing the scale of the leak.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing a conventional leak detection drainage device, Fig. 2 is an explanatory diagram showing an embodiment of the leak detection drainage device of the present invention, and Fig. 6 is a configuration of the alarm ID No. d circuit in the device of the present invention. FIG. 4 is a circuit diagram showing an example of the configuration of a valve opening/closing signal circuit and a leak rate detection signal circuit in the apparatus of the present invention. 1 ・・・・・・・・・・・・・・・Tank 2...
・・・・・・・・・・・・ Drain sump floor 6 ・
・・・・・・・・・・・・・・・Drain pipe 4 ・・・・・・
・・・・・・・・・ Drain sump wall 5 ・・・・・・
・・・・・・・・・Leak detector 6 ・・・・・・・・・
・・・・・・・・・Leak water receiver 7 ・・・・・・・・・・・・
・・・・・・Solenoid valve 8 ・・・・・・・・・・・・・・・
Bypass valve 9 ・・・・・・・・・・・・Flow rate needle 10 ・・・・・・・・・・・・・・・ Large leak detector 1
1 ・・・・・・・・・・・・・Small leakage detector middle゛1 12 ・・・・・・・・・・・・・・・・Control measurement circuit S, ・・・・・・・・・・・・Leakage detection signal S
, ・・・・・・・・・・・・Large ugliness detection signal S
, ・・・・・・・・・・・・Small leak alarm signal 8
4 ・・・・・・・・・・・・・・・Large leak speed detection signal S, ・・・・・・・・・・・・Large leak alarm signal 8, ・・・・・・・・・・・・・・・Small leak alarm signal S, ・・・・・・・・・・・・・・・Valve opening/closing signal S, ・・・・・・・・・・・・・・・Leakage speed detection signal 8 @ * Le * 811... Reset signal (7317) Representative patent attorney Kensuke Noriyuki (and 1 other person): ・ Figure 1 Figure 2 Figure 3 z

Claims (1)

[Claims] 1. A leakage water receiver provided on the floor of the drain sump to collect leaked water, a drain pipe whose upper end opens inward, a solenoid valve provided in the middle of the drain pipe, and a flow rate. A needle, a large leak detector installed so that the detection part is located at a predetermined level in the drain sump, a small leak detector installed so that the detection part is located inside the leak water receiver, and a leakage detector from these detectors. and a control measurement circuit that inputs a large leak detection signal, a small leak detection signal, and a large leak velocity detection signal from the flow rate needle, and outputs a large leak alarm signal, a small leak alarm signal, a valve opening/closing signal, and a leak velocity detection signal. A leakage detection drainage device characterized by: 2. The bypass pipe is provided so that its upper end opens at a predetermined level of the drain sump wall surface and its lower end opens at a position below the solenoid valve of the drain pipe. Leak detection drainage device 1