JPH031840Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a floor drain device for a nuclear power plant.

[Technical background of the invention] In general, a nuclear power plant is provided with a floor drain device to treat leakage water leaking from equipment piping and the like disposed within the building.

FIG. 1 shows such a conventional floor drain system for a nuclear power plant, and in the figure, reference numeral 1 indicates a building wall. A rectangular curve 2 is formed in the building 1 to prevent floor leakage from expanding, and equipment is disposed within the area partitioned by this curve 2. Further, a level detector 3 equipped with, for example, an electrode rod is disposed at this curve 2 and at the exit of the building 1.

In the floor drain system of a nuclear power plant configured in this way, when floor leakage occurs within the area partitioned by curve 2, the leaked water is gradually stored within curve 2, and the water level within this curve 2 increases. When the water level increases to a point where the level detector 3 can detect a leak, an alarm is issued and the operator can be informed of the leak.

[Problems with the Background Art] However, in the floor drain device of a nuclear power plant configured in this way, the area partitioned by the curve 2 generally has a considerable width.
In addition, since curve 2 also has a certain width, it takes a considerable amount of time and leakage amount for the leaked water to rise within this curve 2 to a height that can be detected by the level detector 3. There was a problem in that leaks could not be detected quickly and reliably.

[Purpose of the invention] The present invention has been made in response to such conventional circumstances, and is intended to provide a floor drain device for a nuclear power plant that can quickly and reliably detect leakage from equipment, etc.

[Summary of the invention] That is, the present invention provides a floor drain receiver that includes an outer cylinder and an inner cylinder, and in which the upper end opening of the outer cylinder is disposed below the floor surface, and the outer cylinder of this floor drain receiver. a level detector for measuring the liquid level in the inner cylinder; a drain liquid discharge pipe that opens into the inner cylinder and drains the drain liquid in the inner cylinder; and a drain liquid discharge pipe arranged above the opening of the drain liquid discharge pipe. A floor drain device for a nuclear power plant, characterized in that the gap between the outer cylinder and the inner cylinder is formed to a minimum value necessary for arranging the level detector. .

[Embodiment of the invention] The details of the invention will be described below with reference to an embodiment shown in the drawings.

FIGS. 2 and 3 show an embodiment of the present invention, and in the figures, reference numeral 4 has a floor surface that is inclined toward the center. A floor drain receiver 7 consisting of a cylindrical outer cylinder 5 and an inner cylinder 6 disposed concentrically within the outer cylinder 5 is buried in the center of the floor surface 4. The upper end opening of the cylinder 5 is arranged below the floor surface 4. The upper end opening of the inner cylinder 6 is shielded by a mezzara 9 having a large number of through holes 8, and a drain liquid discharge pipe 10 has its tip protruding into the inner cylinder 6 at the bottom of the inner cylinder 6. It is arranged. A bottomed cylindrical cover plate 11 is disposed above the drain liquid discharge pipe 10 to cover the drain liquid discharge pipe 10, and the upper end of the drain liquid discharge pipe 10 is located approximately in the middle of the cover plate 11. It is said to be the location. A support member 1 is provided at the upper part between the outer cylinder 5 and the inner cylinder 6.
A level detector 13 is disposed supported by 2, and two electrodes 14 of this level detector 13
is inserted between the outer cylinder 5 and the inner cylinder 6.

In the figure, numeral 15 indicates an alarm device,
This alarm device 15 amplifies the signal from the level detector 13, and outputs an alarm signal to the alarm device 16 when this value exceeds a predetermined constant value.

With the nuclear power plant floor drain system configured as described above, if there is a leak in equipment piping, etc. in the building where the nuclear power plant floor drain system is installed, the leaked water will drain to the floor surface 4. The water flows toward the center of the outer cylinder 5 and the inner cylinder 6 through the opening between the outer cylinder 5 and the inner cylinder 6, and the height of this leaked water comes into contact with the electrode rod 14. When the level reaches the height, a signal is output from the level detector 13 to the alarm device 15, and the alarm device 15 amplifies this signal and the alarm 16
Outputs an alarm signal. When the height of the leaked water becomes higher than the height of the floor drain receiver 7, the leaked water flows into the inner cylinder 6 through the through hole 8 of the mezzara 9 and flows between the drain liquid discharge pipe 10 and the cover plate 8. The drain liquid is discharged from the drain pipe 10 through the space.

However, in the floor drain device for a nuclear power plant configured as described above, the gap between the outer cylinder 5 and the inner cylinder 6 is set to the minimum dimension necessary for arranging the level detector 13. Leakage water that has flowed between the outer cylinder 5 and the inner cylinder 6 from the surface 4 quickly reaches a height that can be detected by the level detector 13, making it possible to quickly detect leakage.

In addition, in the floor drain device for a nuclear power plant configured as described above, a drain liquid discharge pipe 1 is provided in the inner cylinder 6.
Since water or leaked water is always stored up to the upper end of 0, gas etc. in other buildings with which the drain liquid discharge pipe 10 communicates passes through this drain liquid discharge pipe 10.
It is completely prevented from flowing into the building where the floor drain device of this nuclear power plant is installed.

FIG. 4 shows another embodiment of the present invention,
The bottom between the outer cylinder 5 and the inner cylinder 6 and the drain liquid discharge pipe 1
The structure is similar to that of the embodiment shown in FIGS. 2 and 3, except that the drain pipe 16 with a plug 17 is connected to the side surface of the drain pipe 1. In FIG. 4, the other parts are constructed in the same manner as in FIGS. 2 and 3, so the same parts are given the same reference numerals and the explanation will be omitted.

In the floor drain system of a nuclear power plant configured as described above, a leak occurs, and after this leak is detected by the level detector 13, the outer cylinder 5 and the inner cylinder 6 are connected by removing the plug 17. The leaked water between the drains can be quickly discharged from the drain liquid discharge pipe 10 through the drain pipe 16, and the initial state without leakage can be quickly restored.

FIG. 5 shows still another embodiment of the present invention, in which the outer cylinder 5a and the inner cylinder 6a are connected in consideration of buffering between the reinforcement 18 arranged inside the floor and the floor drain receiver 7a. The bottom is shallow, and this makes construction easier on-site. In addition, except for the above-described points in FIG. 5, the configuration is the same as in FIGS. 2 and 3, so parts common to those in FIGS. .

FIGS. 6 and 7 show still another embodiment of the present invention, and in the figures, reference numeral 19 indicates a gutter installed inside the building. This side groove 19 includes an outer cylinder 5b having a square wall surface, and an outer cylinder 5b having a rectangular wall surface.
A floor drain receiver 7b composed of an inner cylinder 6b disposed in the inner cylinder 6b is buried therein, and the upper end opening of the outer cylinder 5b is arranged below the side gutter 19. Inner cylinder 6
The upper end opening of b is shielded by a mezzara 9b having a large number of through holes 8b, and a drain liquid discharge pipe 10b is disposed at the bottom of the inner cylinder 6b with its tip protruding into the inner cylinder 6b. has been done. Above this drain liquid discharge pipe 10b is this drain liquid discharge pipe 1.
A cylindrical cover plate 11b with a bottom is disposed to cover the cover plate 11b, and the upper end of the drain liquid discharge pipe 10b is located approximately in the middle of the cover plate 11b. Outer cylinder 5b
A level detector 13b is disposed at the upper part between the inner cylinder 6b and the support member 12b, and the two electrodes 14b of the level detector 13b
is inserted between the outer cylinder 5b and the inner cylinder 6b.

In the figure, reference numeral 15b indicates an alarm device, and this alarm device 15b amplifies the signal from the level detector 13b, and outputs an alarm signal to the alarm device 16b when this value exceeds a predetermined constant value. .

In the nuclear power plant floor drain system configured as described above, if there is a leak in the equipment piping etc. in the building where the nuclear power plant floor drain system is installed, the leaked water will flow into the side gutter 19. After flowing in, it flows along this side groove 19 and flows between the outer cylinder 5b and the inner cylinder 6b from the opening between the outer cylinder 5b and the inner cylinder 6b, and the height of this leaked water is the electrode rod. 14b, a signal is output from the level detector 13b to the alarm device 15b, and the alarm device 15
b amplifies this signal and outputs an alarm signal to the alarm device 16b. When the height of the leaked water becomes higher than the height of the floor drain receiver 7b, the leaked water flows into the inner cylinder 6b through the through hole 8b of the mezzara 9b and flows between the drain liquid discharge pipe 10b and the cover plate 11b. The drain liquid passes through the space and is discharged from the drain liquid discharge pipe 10b.

However, in the floor drain device of a nuclear power plant configured as described above, the gap between the outer cylinder 5b and the inner cylinder 6b is set to the minimum dimension necessary for arranging the level detector 13b. The leaked water flowing between the outer cylinder 5b and the inner cylinder 6b from the surface 4b quickly reaches a height that can be detected by the level detector 13b.
It becomes possible to quickly detect leaks.

In addition, in the floor drain device of a nuclear power plant configured as described above, water or leaked water is always stored in the inner cylinder 6b up to the upper end of the drain liquid discharge pipe 10b. Gas, etc. in other buildings that communicate with this drain liquid discharge pipe 10b.
It is completely prevented from flowing into the building where the floor drain equipment of this nuclear power plant is installed.

FIG. 8 shows another embodiment of the present invention,
The embodiment shown in FIGS. 6 and 7 is different from the embodiment shown in FIGS. 6 and 7 except that the bottom between the outer cylinder 5b and the inner cylinder 6b and the side surface of the drain liquid discharge pipe 10b are connected by a drain drain pipe 16b equipped with a stopper 17b. are configured similarly. In FIG. 8, the other parts are constructed in the same manner as in FIGS. 6 and 7, so the same parts are given the same reference numerals and the explanation will be omitted.

In the floor drain system of a nuclear power plant configured as described above, after a leak occurs and the leak is detected by the level detector 13b, the outer cylinder 5b and the inner cylinder 6b are connected by removing the plug 17b. The leaked water between the drains can be quickly discharged from the drain liquid discharge pipe 10b through the drain drain pipe 16b, and the initial state without leakage can be quickly restored.

FIG. 9 shows still another embodiment of the present invention, in which the structure between the outer cylinder 5c and the inner cylinder 6c is taken into consideration to buffer the reinforcement 18b arranged inside the floor and the floor drain receiver 7c. The bottom is shallow, and this makes construction easier during on-site construction.
Other than what has been described above in FIG. 9, the configuration is the same as in FIGS. 6 and 7, so parts common to those in FIGS. .

Figure 10 shows the installation location of the floor drain device of the nuclear power plant mentioned above. A floor drain device for a nuclear power plant shown in FIGS. 6 to 9 is installed in a side gutter 19 formed along the corner of the building.

[Effects of the invention] As described above, according to the floor drain device for a nuclear power plant of the invention, the gap between the outer cylinder and the inner cylinder is set to the minimum value necessary for installing the level detector. Therefore, leaked water that has flowed into the gap quickly reaches a height that can be detected by a level detector, and leaked water from equipment, piping, etc. can be detected quickly and reliably. In addition, the floor drain device for a nuclear power plant configured as described above is capable of detecting leakage while draining water, and is therefore extremely effective in preventing the expansion of a contaminated area due to leaked water.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a building to explain a conventional floor drain device for a nuclear power plant, Fig. 2 is a longitudinal sectional view showing a floor drain device for a nuclear power plant according to an embodiment of the present invention, and Fig. 3 is a top view of FIG. 2, FIGS. 4 to 9 are longitudinal sectional views showing other embodiments of the present invention, and FIG. 10 is an explanatory diagram for explaining where the embodiment of the present invention is applied. be. 4...Floor surface, 5, 5a, 5b, 5c...Outer cylinder,
6, 6a... Inner cylinder, 7, 7b... Floor drain receiver, 10, 10b... Drain liquid discharge pipe, 11, 1
1b...Cover plate, 13, 13b...Level detector.

Claims (1)

[Scope of utility model registration request] A floor drain receiver comprising an outer cylinder and an inner cylinder, the upper end opening of the outer cylinder being disposed below the floor surface, and a level detector for measuring the liquid level in the outer cylinder of the floor drain receiver. , a drain liquid discharge pipe that opens into the inner cylinder and drains the drain liquid in the inner cylinder, and a cover plate disposed above the opening of the drain liquid discharge pipe, and the outer cylinder and the inner cylinder are connected to each other. A floor drain device for a nuclear power plant, characterized in that a gap between the cylinder and the cylinder is formed to a minimum value necessary for arranging the level detector.