JPH039033B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a lined container for temporarily storing a liquid such as a radioactive waste liquid in a nuclear power plant, for example, and transferring the liquid to a separately provided waste liquid processing device or the like.

[Technical background of the invention]

A conventional example will be explained with reference to FIG. In the figure, 1 indicates a waste liquid storage tank. This waste liquid storage tank 1 is constructed by lining a concrete building frame 2 with an austenitic stainless steel plate 3 as a metal lining plate, and is kept airtight by a ceiling wall 4 provided below the ceiling 2A of the building frame 2. There is. A liquid level measuring device 5 and a waste liquid concentration measuring device 6 are provided penetrating the ceiling wall 4. The liquid level measuring device 5 measures the liquid level of the waste liquid in the storage tank 1, and the liquid waste concentration measuring device 6 measures the concentration of the waste liquid in the storage tank 1. Furthermore, the liquid level measuring device 5 and the waste liquid concentration measuring device 6 are configured so that they can be repaired and inspected using the space above the ceiling wall 4. A waste liquid inflow pipe 7 is connected to the side wall 1A of the waste liquid storage tank 1.
The structure is such that waste liquid flows into the waste liquid storage tank 1 through the waste liquid storage tank 1. A pump chamber 8 is provided below the waste liquid storage tank 1, and a discharge circulation pump 9 is installed therein. A discharge pipe 10 is provided between the suction port 9A of the discharge circulation pump 9 and the bottom of the waste liquid storage tank 1.
is installed. Further, a transfer pipe 11 having a flow rate control valve 12 is provided at the discharge port 9B of the discharge circulation pump 9.
is connected to a separate waste liquid treatment device 1.
Up to 5 are installed. A stirring drive pipe 13 is branched and connected to the transfer pipe 11 in front of the flow rate control valve 12, and extends through the concrete building frame 2 and the ceiling wall 4 into the waste liquid storage tank 1. This stirring drive piping 13 has an automatic opening/closing valve 14.
is inserted.

According to the above configuration, the waste liquid containing radioactive waste is sent into the waste liquid storage tank 1 via the waste liquid inflow pipe 7. The liquid level measuring device 5 detects a preset liquid level and outputs a signal. This stops the flow of waste liquid. When the waste liquid stored in the waste liquid storage tank 1 is to be discharged and transferred to the waste liquid treatment device 13, the discharge circulation pump 9 is driven. At this time, the flow rate control valve 12 inserted in the transfer pipe 11 is closed, and the stirring drive device 1
The automatic on-off valve 14 inserted in the valve 3 is opened. Then, a waste liquid storage tank 1, a discharge pipe 10, a transfer pipe 1
The waste liquid is circulated through a route connecting 1 and stirring drive piping 13, and is stirred to make the concentration distribution uniform. After confirming that the concentration of the waste liquid has become uniform using the waste liquid concentration measurement device 6, the automatic opening/closing valve 14 is closed, the flow rate control valve 12 is opened, and the waste liquid is transferred to the waste liquid treatment device 13.

[Problems with background technology]

According to the above configuration, since the stirring drive pipe 13 is disposed to penetrate through the concrete building frame 2 and the ceiling wall 4, there is a problem that the strength of the concrete frame 2 is reduced, leading to a decrease in seismic resistance.
Furthermore, since the piping line is long, a discharge circulation pump with high capacity is required, and there is a high possibility that the piping will break in the event of an earthquake, which is not desirable in terms of reducing costs and improving safety.

[Purpose of the invention]

An object of the present invention is to provide a lined container that can improve the earthquake resistance of concrete buildings and simplify piping lines.

[Summary of the invention]

The lined container according to the present invention includes a storage tank formed by lining a concrete building frame with a metal lining plate, a discharge circulation pump that transfers the liquid stored in the storage tank, and one end connected to the concrete frame. an outer pipe that penetrates through and is connected to the storage tank, and the other end is connected to the suction side or the discharge side of the discharge circulation pump, and one end provided inside the outer pipe is connected to the discharge side or the suction side of the discharge circulation pump. This configuration includes an inner pipe connected to one side and having the other end opened into the storage tank.

That is, the agitation drive piping is provided on the inner or outer periphery of the discharge piping to form a double piping structure, thereby shortening the piping line and simplifying the equipment.

Therefore, by shortening the piping line, pressure loss can be reduced, the capacity of the discharge circulation pump can be lowered, and the possibility of piping breakage accidents occurring in the event of an earthquake is also reduced, reducing costs and It is extremely effective in improving safety.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 2 to 4.

In the figure, reference numeral 101 indicates a waste liquid storage tank for storing liquid such as waste liquid. This waste liquid storage tank 101 has a structure in which a concrete building frame 102 is lined with an austenitic stainless steel plate 103 as a metal lining plate, and the ceiling portion 102A of the building frame 102 is
It is kept airtight by a ceiling wall 104 provided below. Then, the liquid level measuring device 105 and the waste liquid concentration measuring device 10 are passed through the ceiling wall 104.
6 is provided. And this liquid level measuring device 1
05 to measure the liquid waste level in the storage tank 101,
The configuration is such that the waste liquid concentration in the storage tank 101 is measured by the waste liquid concentration measuring device 106. In addition, these liquid level measuring device 105 and waste liquid concentration measuring device 106
The structure is such that repairs and inspections can be carried out using the space above the ceiling wall 104. A waste liquid inflow pipe 107 is connected to the side wall 101A of the waste liquid storage tank 101, and the waste liquid flows into the waste liquid storage tank 101 via this waste liquid inflow pipe 107. A pump chamber 108 is provided below the waste liquid storage tank 101, and a discharge circulation pump 109 is installed therein. A discharge pipe 110 is disposed between the suction port 109A of the discharge circulation pump 109 and the bottom of the waste liquid storage tank 101. This discharge pipe 110 is connected to the building frame 102 at the bottom of the storage tank 101.
110A of upper discharge piping arranged to penetrate,
It is composed of a large diameter section 110B connected below the upper discharge pipe 110A, and a lower discharge pipe 110C disposed between the side wall of the large diameter section 110B and the suction port 109A of the discharge circulation pump 109. . Also, the discharge port 109 of the discharge circulation pump 109
B has a transfer pipe 111 having a flow control valve 112;
is connected to a separate waste liquid treatment device 1.
Up to 15 are installed.

A stirring drive pipe 113 having an automatic opening/closing valve 114 in front of the flow rate control valve 112 of the transfer pipe 111
is connected to the branch. This agitation drive piping 113 is disposed through the discharge pipe 110 to the inside of the waste liquid storage tank 101, and has a double piping structure. The stirring drive pipe 113 is branched into a plurality of parts within the waste liquid storage tank 101.
The waste liquid circulating through A flows uniformly into the waste liquid storage tank 101.

Next, details of the double piping structure will be explained with reference to FIGS. 3 and 4. That is, the sleeve 11 has a gap on the outer periphery of the discharge pipe 110.
6 is disposed, and a leak detection section 116A is formed between the discharge pipe 110 and the discharge pipe 110. This leak detection section 116A communicates with a leak detection pipe 117 provided below the waste liquid storage tank 101, and for example, the discharge pipe 1
If a leak occurs at the weld between the leak detector 10 and the austenitic stainless steel plate 103, the waste liquid flows into a leak transmitter (not shown) via the leak detector 116A and the leak detector tube 117 and is detected. Furthermore, a leak detection tube 118 for detecting leakage from the welded parts of the austenitic stainless steel plate 103 is installed inside the concrete building frame 102 around the outer periphery of the austenitic stainless steel plate 103, and a leak detection tube 118 is installed to detect leakage from the welded parts of the austenitic stainless steel plate 103. It is connected to a leak transmitting device (not shown). As shown in FIG. 4, the stirring drive pipe 113 is supported by the discharge pipe 110 via a plurality of support members 119.

According to the above configuration, the waste liquid containing radioactive waste is transferred to the waste liquid storage tank 1 through the waste liquid inflow pipe 107.
It will be sent within 01. and liquid level measuring device 10
5 outputs a signal when it detects a preset high liquid level. This signal stops the flow of waste liquid. When the waste liquid stored in the waste liquid storage tank 101 is to be discharged and transferred to the waste liquid processing device 115, the discharge circulation pump 109 is driven. At that time, the flow rate control valve 11 inserted into the transfer pipe 111
The valve 2 is closed, and the automatic opening/closing valve 114 inserted in the stirring drive piping 113 is opened. Then, the waste liquid is circulated through a route connecting the waste liquid storage tank 101, the discharge pipe 110, the transfer pipe 111, and the stirring drive pipe 113, and is stirred to make the concentration distribution uniform. After confirming that the waste liquid concentration has become uniform using the waste liquid concentration measuring device 106, the automatic opening/closing valve 114
is closed, the flow control valve 112 is opened, and the waste liquid is transferred to the waste liquid treatment device 115.

In other words, the stirring drive pipe 113 is replaced by the discharge pipe 110.
By disposing the agitation drive piping 113 on the inner periphery of the concrete building frame 102 and the ceiling wall 104, the route of the stirring drive piping 113 is significantly shortened compared to the conventional case where it was disposed through the concrete building frame 102 and ceiling wall 104, simplifying the equipment and reducing costs. It is possible to reduce the Furthermore, the probability of a pipe breakage accident occurring in the event of an earthquake is reduced, and the outflow of waste liquid due to pipe breakage and secondary disasters caused by this can be prevented, and safety can be greatly improved. Moreover, the number of pipe penetration parts in the concrete building frame 102, the ceiling wall 104, etc. is smaller than in the past, and problems such as the connection of pipes and the generation of stress due to pipe reaction force can be solved. Further, shortening the piping line reduces pressure loss within the piping, making it possible to improve the efficiency of the device, for example by lowering the capacity of the discharge circulation pump 109. Further, a sleeve 116 is provided around the outer circumference of the discharge pipe 110.
A leak detection tube 117 is formed between the leak detection section 116A and the leak detection section 116A.
and the welded part 1 between the discharge pipe 110 and the austenitic stainless steel plate 103 by means of a leakage transmitter.
19A etc., and leakage detection tube 118
This is extremely effective in improving the safety of the device by detecting leakage from the welded portions of the austenitic stainless steel plate 103.

Note that the discharge pipe 110 and the stirring drive pipe 113
In addition to the structure shown in FIG. 3, various other structures can be considered for the double structure with the structure shown in FIGS. 5 to 7, for example. That is, in the example shown in FIG. 5, the upper discharge pipe 110A and the lower discharge pipe 110C, which are connected to the upper and lower ends of the large-diameter portion 110B of the discharge pipe 110, respectively, are shifted in the horizontal direction, and are used as agitation drive pipes. 113 is the large diameter portion 110B and the upper discharge pipe 110A.
It is arranged inside. The example shown in FIG. 6 has a configuration in which a plate 110D is provided at the lower end of the large diameter portion 110B, and the upper discharge pipe 110A and the lower discharge pipe 110C are constructed in the same manner as in the previous embodiment.
Then, the stirring drive pipe 113 passes through this plate 110D to the large diameter portion 110B and the upper discharge pipe 110.
It is located inside A. Moreover, the example shown in FIG.
A plate body 110D is provided at the lower end of the large diameter portion 110B, and a lower discharge pipe 110C is connected to this plate body 110D.
The large diameter portion 110B and the upper discharge pipe 110A are arranged to penetrate through the pipe 10D.

Next, another embodiment will be described with reference to FIGS. 8 and 9. That is, the embodiment shown in FIG. 8 has a configuration in which a discharge pipe 210 is provided protruding into the waste liquid storage tank 201 to prevent sludge 220 deposited at the bottom of the waste liquid storage tank 201 from flowing into the discharge pipe 210 and clogging the pipe. It is. Therefore, not only can the same effects as in the embodiments described above be achieved, but also the clogging of the discharge piping 210 can be prevented, and the health of the apparatus can be greatly improved.

Further, in the embodiment shown in FIG. 9, the discharge pipe 310 and the stirring drive pipe 313 are arranged to penetrate the lowest part of the side wall of the waste liquid storage tank 301, and the stirring drive pipe 313 has a branch pipe 313A inside the storage tank 301. Therefore, the same effects as in the above embodiment can be achieved.

Note that the same parts in the drawings are denoted by the same numbers, and descriptions of the same components as in the previous embodiment are omitted.

〔Effect of the invention〕

The lined container according to the present invention includes a storage tank formed by lining a concrete building frame with a metal lining plate, a discharge circulation pump that transfers the liquid stored in the storage tank, and one end connected to the concrete frame. an outer pipe that penetrates through and is connected to the storage tank and has its other end connected to the suction side or the discharge side of the discharge circulation pump; and an outer pipe that is provided inside the outer pipe and has one end connected to the discharge side or suction side of the discharge circulation pump. The structure includes an inner pipe connected to the storage tank and having the other end opened into the storage tank.

Therefore, the liquid stored in the storage tank is sucked into the discharge circulation pump through the outer or inner pipe, and the liquid discharged from the discharge circulation pump is returned to the storage tank through the inner or outer pipe. , the number of piping penetrations in the concrete building frame can be reduced, and the earthquake resistance of the concrete building can be improved. Further, even if the inner pipe is damaged, the liquid will not leak out of the pipe, so safety can be improved. moreover,
Unlike the conventional method, there is no need for the stirring drive piping to penetrate the concrete building frame, so the piping line can be simplified.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a conventional waste liquid device;
4 to 4 are views showing one embodiment of the present invention, FIG. 2 is a sectional view of the waste liquid device, FIG. 3 is a partially enlarged view of FIG. 2, and FIG. 4 is a cross-sectional view of FIG. 3. , FIGS. 5 to 7 are cross-sectional views showing another double piping structure,
FIGS. 8 and 9 are cross-sectional views showing another embodiment. 101... Waste liquid storage tank, 102... Concrete building frame, 103... Austenitic stainless steel plate, 109... Discharge circulation pump, 110... Discharge piping, 113... Stirring drive piping.

Claims (1)

[Claims] 1. A storage tank formed by lining the concrete frame of a concrete building with a metal lining plate, a discharge circulation pump that transfers the liquid stored in this storage tank, and one end passing through the concrete frame to an outer pipe connected to the storage tank and having its other end connected to the suction side or the discharge side of the discharge circulation pump; and an outer pipe provided inside the outer pipe and having one end connected to the discharge or suction side of the discharge circulation pump. A lined container comprising an inner pipe whose end opens into the storage tank.