JPH0455954B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a lined container used in nuclear facilities, general chemical plants, etc., and particularly relates to a lined container equipped with a nozzle for connecting pipes. .

(Prior Art) Lined containers lined with metal such as stainless steel are widely used in nuclear power related facilities, general chemical plants, and the like. For example, lining containers for storing radioactive waste in nuclear power plant facilities are used for the purpose of storing radioactive waste generated within the nuclear power plant and attenuating radioactivity.

Lined containers used in nuclear power related facilities store radioactive materials and are therefore subject to strict safety conditions. One condition is that corrosion, deformation, breakage, etc. should not occur even during an earthquake or after a long period of time. Another condition is that even in the unlikely event that an accident occurs, it must be able to be detected and dealt with immediately. In other words, the leakage detection function is required to be quick and reliable.

FIG. 4 shows a conventional lined vessel used in nuclear facilities such as fuel pools, equipment storage pits, or waste liquid storage pools.

This lining container 1 has a concrete frame 2
The sealed chamber is lined with a metal lining plate 3 such as an austenitic stainless steel plate. This lining plate 3 is welded and fixed to a plurality of embedded materials 4 buried in the concrete frame 2.

A small gap 5 (see FIG. 5) is formed between the concrete frame 2 and the lining plate 3, and this gap 5 is connected to a plurality of branch pipes 7 for leak detection at the bottom. Each leak detection branch pipe 7 is connected to a main pipe 8.
After being connected to the drain tank 9, it is guided to the drain tank 9.
This drain tank 9 is equipped with a liquid level detector 10, and an alarm 11 is connected to the liquid level detector 10. In the event that radioactive material leaks to the outside of the lining plate, the leaked material passes through the gap 5, leak detection branch pipe 7, and main pipe 8, and accumulates in the drain tank 9, and the liquid level detector 10 detects this leakage material. An alarm 11 is activated by detecting the liquid level.

On the other hand, a nozzle 15 is provided passing through the concrete frame 2 and the lining plate 3. A detailed view of the nozzle head is shown in Figure 5. The nozzle 15 is provided through a sleeve 16 provided in the concrete frame 2, and is supported by welding to a thick lining plate 17. The thick plate lining plate 17 is the same as the lining plate 3.
It is fixed by welding.

The nozzle 15 connects the pipe 18 to the outside of the lining container 1.
This piping 18 is fixed to the piping support 19 with U bolts 20. The piping support 19 is embedded and fixed in the concrete frame 2.

A ring 22 is internally fixed to the sleeve 16 to form a leakage water collection space 23. This leakage water collection space 23 communicates with an annular space 25 via a conduction hole 24. This annular space 25 communicates with the gap 5 between the lining plate 3 and the concrete frame 2 through a leak detection groove 26.

And, in case the nozzle 15 and the thick plate lining plate 17
If there is a leakage from the welded part 27 etc., the leaked material will accumulate in the leakage water collection space 23 and the through hole 2
4. The water passes through the annular space 25, the leakage detection groove 26, and the gap 5 in order, and is sent to the drain tank 9 as described above, and the water level in the drain tank 9 is detected by the liquid level detector 10.
is detected and the alarm 11 is activated.

(Problems to be Solved by the Invention) Conventional lined containers have had the following problems.

The piping is fixed using U-bolts on the outside of the lining container, which is the same method as general piping, and has a certain amount of leeway. For this reason,
When a bending moment is generated in the nozzle stub due to the weight of the piping, vibration, thermal expansion, etc., stress is concentrated at the junction between the nozzle stub and the thick lining plate, causing strength problems.

Furthermore, since the leakage water collection space is open to the outside air, the outside air flows into the gap between the lining plate and the concrete frame through the conduction holes, causing dew condensation on the surface of the concrete frame in the gap. The condensed water passes through the gap and passes through the branch piping for leak detection, accumulates in the drain tank, and activates the alarm. For this reason, it was necessary to check whether a leak had actually occurred or whether it was a false alarm due to condensation, and in some cases the nuclear power plant had to be shut down.

Furthermore, the dew condensation causes lubrication on the back surface of the lining plate, causing accelerated corrosion of the lining plate and other metal parts.

The present invention has been made in consideration of the above-mentioned circumstances, and provides a lined container that has a simple structure, improves the strength of the nozzle stub, and can prevent false alarms of leakage and the occurrence of condensation that causes corrosion. The purpose is to

[Structure of the invention]

(Means for solving the problem) A lining plate is lined on the inner surface of the concrete frame, and a nozzle is provided that penetrates the lining plate and a sleeve provided on the concrete frame, and the concrete frame and the lining plate are connected to each other. 〓
In a lined container in which a space between the nozzle and the sleeve is connected to each other, the nozzle is supported by supporting members at at least two places,
The space between the nozzle and the sleeve is hermetically sealed by the sealing member which also serves as the supporting member.

(Function) According to the present invention, since the nozzle head is supported at at least two places, even if a bending moment occurs in the nozzle head, stress is not concentrated at one point, and moreover, the nozzle head and the sleeve are Since the space is airtightly sealed, outside air will not flow in, thus preventing false alarms of leakage due to condensation and corrosion of the lining plate, etc.

That is, according to the present invention, the newly installed sealing member prevents outside air from flowing into the gap between the concrete frame and the lining plate from the space between the nozzle stub and the sleeve, thereby preventing dew condensation on the lining plate. In addition to preventing this, the sealing member can also be used as a support member for the nozzle head, so it is possible to strengthen support for the nozzle head and ensure sealing with a simple configuration.

(Example) A first example of the lined container according to the present invention is described below.
This will be explained using Figures 3 to 3.

The overall structure of the lined container is shown in FIG. 2, and is basically the same as the conventional lined container shown in FIG. 4, so the same reference numerals are given and the explanation will be omitted.

A detailed view of the nozzle head is shown in Figure 1. Sleeve 16 penetrates concrete frame 2
A thick lining plate 17 is fixed to the lining plate 3 by welding. A support ring 30 is fixed to the sleeve 16 by welding. Nozzle 15
is welded and supported at two locations: the support ring 30 as a support member and the thick lining plate 17.

The space between the nozzle 15 and the sleeve 16 is hermetically sealed by the support ring 30 and the thick lining plate 17 as seal members. Since the other configurations are the same as those shown in FIG. 5, the same members are given the same reference numerals and their explanation will be omitted.

In the above embodiment, the nozzle stub 15 is supported at two locations, the thick lining plate 17 and the support ring 30, so even if a bending moment occurs in the nozzle stub 15, stress will not be concentrated at one location. moreover,
Since the space between the nozzle stub 15 and the sleeve 16 is airtightly sealed by the support ring 30 and the thick lining plate 17, outside air does not flow in.
Condensation does not occur on the surface of the concrete frame 2 in the gap 5. Therefore, false alarms of leakage and corrosion of the lining plate etc. can be prevented.

Another embodiment of the invention is shown in FIG. In this embodiment, a plurality of support blades 32, a seal ring 33, and a seal boss 34 are provided in place of the support ring 30 of the embodiment shown in FIG. This is what I did.

The nozzle 15 is supported at multiple points by a plurality of support blades 32 and a thick lining plate 17 as support members. Further, the space between the nozzle stub 15 and the sleeve 16 is hermetically sealed by a thick lining plate 17, a seal ring 33, and a seal boss 34 as seal members. For other configurations, see
Since it is not different from the embodiment shown in the figure, the explanation will be omitted.

In this embodiment, the nozzle 15 is welded and fixed from both sides of the thick lining plate 17, and a plurality of support blades 32
Since it is supported at multiple points, the strength is further improved. Further, since the support blade 32 supports the nozzle head 15 in a slidable manner, and the seal boss 34 also slidably seals the nozzle head 15, it is possible to cope with the case where the nozzle head 15 thermally expands in the axial direction. can. Therefore, this embodiment is suitable for lined containers that experience large temperature changes. Other effects similar to those of this embodiment shown in FIG. 1 are obtained.

〔Effect of the invention〕

In the present invention, since the nozzle is supported at two or more places,
Even when a bending moment occurs in the nozzle, stress is not concentrated in one place, and the strength can be improved.

Further, since the space between the nozzle and the sleeve is airtightly sealed by the sealing member, outside air does not flow into the gap between the concrete frame and the lining plate, and no dew condensation occurs on the surface of the concrete frame in the gap.
Therefore, false alarms of leakage can be prevented with a simple configuration. When the present invention is applied to the lining vessel of a nuclear power plant, there will be no need to stop the nuclear power plant due to false alarms of leakage.
The operating rate of nuclear power plants can be improved.

Furthermore, since no dew condensation occurs in the gap between the concrete frame and the lining plate, corrosion of the lining plate and other metal parts can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the present invention, FIG. 2 is an overall configuration diagram of the above embodiment, FIG. 3 is a diagram showing another embodiment of the present invention, and FIG. 4 is a diagram of a conventional lined container. The overall configuration diagram, FIG. 5, is a diagram showing the structure of the nozzle part of a conventional lining container. 2... Concrete frame, 3... Lining plate, 5... Gap, 11... Alarm, 15... Nozzle, 16... Sleeve, 17... Thick lining plate, 22... Ring, 23... leakage water collection space,
24... Conductive hole, 25... Annular space, 26... Leak detection groove, 32... Support blade, 33... Seal ring, 34... Seal boss.

Claims (1)

[Scope of Claims] 1. A lining plate is lined on the inner surface of the concrete frame, and a nozzle is provided that penetrates the lining plate and a sleeve provided on the concrete frame, and the concrete frame and the lining plate are connected to each other.
In a lined container in which a space between the nozzle and the sleeve is connected to each other, the nozzle is supported by supporting members at at least two places,
A lined container characterized in that a space between the nozzle stand and the sleeve is hermetically sealed by a sealing member that also serves as the supporting member. 2. The lined container according to claim 1, wherein the nozzle is supported by a thick lining plate as a support member and a plurality of support blades, and the space between the nozzle and the sleeve is kept airtight by a sealing member. 3. The lined container according to claim 1, wherein the sealing member comprises a seal ring and a seal boss.