JPH0146391B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a lining device installed on a floor surface where liquid leakage is expected, and particularly for use as a countermeasure against leakage of coolant sodium in fast breeder reactors. The present invention relates to a suitable lining device.

[Technical background of the invention and its problems]

Generally, in fast breeder reactor plants, a method is adopted in which the heat generated in the reactor is transferred to the steam generator via coolant piping, intermediate heat exchangers, etc., but liquid is used as the heat transport medium. Metallic sodium (hereinafter abbreviated as sodium) is frequently used.

By the way, in this type of fast breeder reactor plant, sodium is used at high temperatures (approximately 300 to 600 degrees Celsius), so in the unlikely event that reactor cooling system equipment or piping breaks, leaked sodium could directly contact the building concrete. If contact occurs, the structural integrity of the concrete will be compromised. To prevent this, a liner plate such as a steel plate has been installed on the floor of a room in a building via a heat insulating material to prevent direct contact between leaked sodium and concrete.

Nuclear power plant buildings are generally constructed of reinforced concrete and are divided into a number of rooms by partition walls. In a fast breeder reactor plant, equipment and piping containing sodium are installed in these rooms, and lining devices to prevent sodium leakage are installed over the entire floor surface of each of these rooms. In the event of a sodium leak accident, high-temperature sodium will be stored in direct contact with the steel liner plate. Therefore, ensuring the structural integrity and improving the reliability of the lining device itself will lead to ensuring the structural integrity of the building concrete and further improving the safety of the entire plant.

Figure 3 shows a conventional lining system for a room related to sodium equipment in a fast breeder reactor plant.A liner plate 3 is installed on the entire floor 1 with a heat insulating material 2 in between, Even in the event that sodium leaks from the pipe 5, care is taken to prevent the floor 1 from coming into direct contact with this high-temperature leaked sodium. In addition, if a foundation 6 is required for the sodium equipment 4 as shown in Fig. 3, a liner plate 3 is installed around and on the top surface of the foundation 6 without any gaps to prevent leaking sodium from leaking from the lining device. It's summery.

In the conventional lining device having the above configuration, in the unlikely event that sodium equipment 4, sodium piping 5
When sodium leaks from the floor 1, etc., the leaked sodium is stored on the liner plate 3 placed on the floor 1.

By the way, this sodium has a high temperature, and the liner plate 3 is usually made of steel plate and has a large coefficient of thermal expansion, so the liner plate 3 on the floor 1 tends to expand significantly.

On the other hand, when the sodium equipment 4 welded to the liner plate 3 installed on the liner plate 3 is fixed on the floor 1 via the foundation 6 or directly, the liner plate 3 is It will be indirectly fixed to the floor 1. And in this case,
Sodium equipment 4 against thermally expanding liner plate 3
is the constraint point. As a result, a large thermal stress is generated in each part of the liner plate 3, the bent part is deformed, and the flat part is buckled and takes on a wavy shape.

Generally, the liner plate 3 is constructed by welding a large number of steel plates, but in order to further improve the reliability of the liner plate 3, in the event of a sodium leak where the steel plate temperature is expected to become extremely high. In order to ensure the structural integrity of the lining equipment, it is necessary to prevent the thermal stress and deformation from occurring in the liner plate 3.

[Purpose of the invention]

The present invention was made in view of the current situation, and it is an object of the present invention to provide a lining device that can eliminate the constraint points of the liner plate, prevent the occurrence of thermal stress and deformation, and improve structural reliability.

[Summary of the invention]

The present invention provides an opening for forming a required gap between the peripheral edge and the outer circumferential surface of the structure in a portion of the liner plate placed on the floor surface that corresponds to the structure, so that the structure can be attached to the liner plate. A side wall liner should be installed around the periphery of the opening in a watertight manner so as not to become a constraint point during thermal expansion, and the side wall liner should be watertightly installed at the periphery of the opening with a rising dimension equal to or higher than the highest expected leakage liquid level. The cover liner covers the gap between the side wall liner and the structure from the upper side of the structure without contacting the side wall liner, thereby ensuring that the entire amount of leaked liquid is captured by the liner plate. .

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

In the figure, 1 is a floor, and a liner plate 3 made of steel plate or the like is laid over the entire area of the floor 1 with a heat insulating material 2 interposed therebetween. Further, a sodium equipment 4 is installed on the floor 1 via a foundation 6, and a sodium pipe 5 is connected to the sodium equipment 4.

In the portion of the liner plate 3 corresponding to the foundation 6,
As shown in FIG. 1, an opening 3a is provided with a required gap G between the peripheral edge and the outer peripheral surface of the foundation 6,
Consideration is given so that the foundation 6 does not become a constraint point when the liner plate 3 thermally expands. At the periphery of this opening 3a, as shown in FIG. 1, a side wall liner 8 having a rising dimension equal to or higher than the assumed maximum liquid level of leaked sodium is erected integrally with the liner plate 3.
On the other hand, on the upper surface of the foundation 6, as shown in FIG. 1, a cover liner 9 whose center part is watertightly welded to the sodium equipment 4 is disposed, and the outer peripheral edge of the cover liner 9 is bent downward. The bent portion 9a is located on the outer peripheral side of the side wall liner 8 without contacting the side wall liner 8. This cover liner 9 completely covers the gap G between the side wall liner 8 and the foundation 6 from its upper surface side.

In the above configuration, when sodium leaks from the sodium equipment 4 or the sodium piping 5, the leaked sodium is led directly or along the cover liner 9 onto the liner plate 3 on the floor 1 and stored. Then, since the leaked sodium is at a high temperature, the liner plate 3 will thermally expand. However, the side wall liner 8, the outer peripheral surface of the foundation 6, and the cover liner 9 placed in the opening 3a of the liner plate 3
Since a sufficient gap is formed between the bent portion 9a and the inner circumferential surface of the liner plate 3 in the direction of thermal expansion, the liner plate 3 can be freely displaced according to the amount of thermal expansion. Thermal expansion is not restricted by the foundation 6. Therefore, excessive thermal stress or deformation does not occur in the liner plate 3, and the structural integrity of the liner plate 3 is ensured.

FIG. 2 shows another embodiment of the present invention, which is applied to a sodium pipe 10 passing through a penetration sleeve 11 in a floor 1.

That is, a liner plate 3 made of steel plate or the like is laid over the entire floor 1 with a heat insulating material 2 interposed therebetween.
An opening 3a is provided in the liner plate 3 at a position corresponding to the sodium pipe 10 with a required gap G between the liner plate 3 and the through sleeve 11 protruding from above the floor 1, as shown in FIG. . And this opening 3
At the periphery of a, the estimated maximum liquid level of leaked sodium is 7.
The side wall liner 8 having the above-mentioned rising dimensions is integrally erected.

Further, as shown in FIG. 2, a disc-shaped cover liner 9 is watertightly provided around the sodium pipe 10 at a position directly above the side wall liner 8, and at a position outside the side wall liner 8, a disc-shaped cover liner 9 is provided around the circumference in a watertight manner. A bent portion 9a is provided which is bent downward without contacting the side wall liner 8.
The gap between the side wall liner 8 and the outer peripheral surface of the sodium pipe 10 is completely covered from the upper surface side.

In the above configuration, when sodium leaks from the sodium pipe 10, the leaked sodium is led directly or along the cover liner 9 onto the liner plate 3 on the floor 1 and stored. Then,
Because the leaked sodium is at a high temperature, liner plate 3
will undergo thermal expansion. However, liner plate 3
A sufficient gap is formed in the direction of thermal expansion of the liner plate 3 between the side wall liner 8 disposed at the opening 3a, the outer peripheral surface of the through sleeve 11, and the inner peripheral surface of the bent portion 9a of the cover liner 9. Therefore, the liner plate 3 can be freely displaced according to the amount of thermal expansion, and the thermal expansion is not restricted by the through sleeve 11 or the sodium pipe 10. Therefore, excessive thermal stress or deformation does not occur in the liner plate 3, and the structural integrity of the liner plate 3 is ensured.

Further, although the sodium pipe 10 generally vibrates during normal operation, this vibration is only transmitted to the cover liner 9 and not to the side wall liner 8 and liner plate 3. Therefore, there is no concern that the entire lining equipment will be affected by the vibration of the sodium pipe 10.

Furthermore, since the temperature of the sodium pipe 10 differs between when it is installed and during normal operation, its position changes due to thermal expansion of the connecting pipe. However, since the cover liner 9 only displaces in response to this position change as in the case of the vibration,
There is no risk of applying deformation stress to the liner plate 3.

In both of the above embodiments, the case where the bent portion 9a bent downward is provided at the periphery of the cover liner 9 has been described. For example, the bent portion 9a is not necessarily required.

Further, in both of the above embodiments, the floor 1 is made of reinforced concrete, and there is a heat insulating material between the floor 1 and the liner plate 3.
I explained about the one that is interposed, but the floor 1
may be made of a material other than concrete, and the heat insulating material 2 may be omitted if necessary.

Furthermore, in both of the above embodiments, a fast breeder reactor plant in which the leaked liquid is liquid metal sodium was described, but in the case of a fast breeder reactor plant in which the structural integrity of the liner plate 3 may be impaired due to thermal expansion due to high temperature leaked liquid, , can be applied regardless of the type of leaked liquid. In this case, the liner plate 3 does not necessarily have to be made of steel plate.

〔Effect of the invention〕

As explained above, in the present invention, an opening is provided in a portion of a liner plate arranged on a floor surface corresponding to a structure, so that a required gap is formed between the periphery and the outer peripheral surface of the structure. Therefore, the structure does not become a constraint point during thermal expansion of the liner plate. For this reason,
The structural integrity of the liner plate can be ensured without excessive thermal stress being applied to the liner plate or deformation of the liner plate.

In addition, a side wall liner with a rising dimension equal to or higher than the highest expected leakage liquid level is watertightly installed around the periphery of the opening provided in the liner plate, and a cover liner is installed watertightly on the structure to protect the side wall. Since the gap between the liner and the structure is covered from the upper surface side, the entire amount of leaked liquid can be reliably collected by the liner plate and will not leak from the liner plate.

In addition, since the cover liner and side wall liner are not in contact with each other, it is possible to prevent the cover liner and side wall liner from coming into contact with each other due to thermal expansion of the liner plate, thereby preventing stress from being applied to the liner plate. Even if the liner plate vibrates or moves, no stress is applied to the liner plate.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing an embodiment of the present invention;
FIG. 2 is a partial sectional view showing another embodiment of the present invention;
FIG. 3 is a diagram corresponding to FIG. 1 showing a conventional example. 1...Floor, 3...Liner plate, 4...Sodium equipment, 5, 10...Sodium piping, 6...Foundation, 7...Estimated highest liquid level of leaked sodium, 8...
...Side wall liner, 9...Cover liner, 9a...Bend portion, 11...Penetration sleeve, G...Gap.

Claims (1)

[Claims] 1. A liner plate laid over the entire floor surface on which a structure is installed or penetrated, and a liner plate provided at the structure position of the liner plate between the peripheral edge and the outer peripheral surface of the structure. an opening in which a required gap is formed; a side wall liner that is watertightly installed around the periphery of the opening and has a rising dimension equal to or higher than the highest expected leakage liquid level;
A lining device comprising: a cover liner that is watertightly attached to the structure and covers the gap between the sidewall liner and the structure from the upper side of the cover liner without contacting the sidewall liner. 2. The lining device according to claim 1, wherein the peripheral edge of the cover liner is bent downward at a position outside the side wall liner.