JPH10132981A - Lining installation for fast breeder reactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the lining installation excellent in corrosion resistance against a high temperature and strong base environment caused by the leakage of liquid metal acting as a cooling agent, and improve a safety countermeasure for the fast breeder reactor. SOLUTION: This invention is concerned with the lining installation laid over the building concrete 1 consisting of a room in which equipment and piping containing liquid metal acting as a cooling agent for the fast breeder reactor, is disposed, a steel liner plate 3 formed out of carbon steel or stainless steel is set over the building concrete 1 by way of heat insulating material 2 so as to be formed into a structure where the surface of the steel liner plate 3 is furthermore covered by a flame spray coating layer 7 formed out of corrosion resistant metal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fast breeder reactor using liquid metal as a coolant, which is installed on concrete which constitutes equipment such as equipment containing liquid metal, a room in which piping is arranged, and a building. Lining equipment.

[0002]

2. Description of the Related Art In a fast breeder reactor that uses liquid metal such as liquid sodium as a coolant, building equipment, that is, equipment containing liquid metal, and each room in which piping is arranged are made of concrete, and the concrete equipment is mounted on the concrete surface. A steel plate liner plate is installed in the lining. This is to prevent the liquid metal from directly contacting the concrete in the event that the liquid metal leaks.

FIG. 3 shows a conventional lining equipment structure.
As shown in FIG. 3, a heat insulating material 2 and a steel plate liner plate 3 are provided on a building concrete 1. Carbon steel or stainless steel is used as the steel material of the steel plate liner plate 3.

When the atmosphere in which the liquid metal leaks is air, a chemical reaction between oxygen and moisture present in the atmosphere and the high-temperature liquid metal generates an alkaline substance such as sodium hydroxide and generates heat. It is assumed that

[0005] However, it is known that carbon steel and stainless steel used for the steel liner plate have a high erosion degree in a high temperature and strong alkaline environment. This can be seen, for example, from the data of FIG. 4 which shows the erosion degree of a practical metal material (Ni content is represented on the horizontal axis) in a hot concentrated caustic soda solution.

[0006] Therefore, when the liquid metal leaks into the air as described above, the steel material of the steel plate liner plate is corroded and reduced in thickness, and further damaged, and the liquid metal may come into direct contact with the building concrete. possible. When the liquid metal comes into direct contact with the concrete, the pressure increases due to the gas generated by the vigorous reaction with the water in the concrete, and the strength of the concrete that has lost water is significantly reduced, which may cause damage to the building. There is. However, conventionally, little consideration has been given to corrosion resistance when the lining equipment is exposed to a high-temperature, strongly alkaline environment, and there is room for improvement in terms of safety measures.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a lining facility which is excellent in corrosion resistance even when exposed to a high temperature and strong alkaline environment caused by leakage of liquid metal, and provides a safety measure for a fast breeder reactor. Is to further improve.

[0008]

SUMMARY OF THE INVENTION The present invention relates to equipment such as nuclear equipment for power generation in a fast breeder reactor, which includes equipment containing liquid metal, a room in which piping is arranged, and a building. In the lining equipment installed on the concrete surface to constitute, the liner used therein has a steel plate liner plate installed on the concrete surface, and a corrosion-resistant metal coated on the steel plate liner plate surface A chamber for arranging devices including liquid metal, characterized by comprising
Provide concrete building lining equipment.

Further, the steel plate liner plate is made of carbon steel or stainless steel, the corrosion resistant metal is formed by spraying on the surface of the steel plate liner plate, and a heat insulating material is laid between the steel plate liner plate and the concrete. Is preferred.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, it is preferable to use a metal having a low corrosion potential as a corrosion-resistant metal coated on the surface of a steel liner plate. Specifically, N
i, Cr, Ni-Cr, Al, Zn, Al-Si, Fe
-C-Mn, Pb, Sn, Ni-Ti-Al, Cu, M
and those selected from pure metals such as o and Nb, alloys and mixtures.

If the surface of the steel liner plate is coated with a corrosion-resistant metal as described above, even if the liquid metal as a coolant leaks into the air and becomes a high-temperature and strong-alkaline environment, the corrosion-resistant metal is prevented. Since the steel is not corroded by alkali, the steel liner plate, which is easily corroded like carbon steel or stainless steel, is protected, and thus direct contact between the liquid metal and concrete can be prevented. Therefore, the safety of the fast breeder reactor can be improved.

As a material that can be used even in a high temperature and strong alkali environment, for example, use of an Inconel material is conceivable, but there is a problem in strength and the like as a structural material. On the other hand, in the present invention, the corrosion-resistant metal used for coating the surface of the steel sheet liner plate may be selected in consideration of only the corrosion resistance. The strength of the material is not required.

In the present invention, in order to coat the corrosion-resistant metal on the surface of the steel liner plate installed on the concrete surface, it is preferable to use a thermal spraying method from the viewpoint of excellent workability. Such a sprayed layer only needs to have the minimum thickness required to maintain the corrosion resistance, and has a sufficient strength even if it is thin, and the thinner the thermal expansion with the steel sheet liner plate as the base material. The difference can be absorbed, and peeling and cracking hardly occur.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a schematic diagram of the building of the fast breeder reactor. As shown in FIG. 2, the building is made of concrete, and equipment 5 containing liquid metal and piping 6 are arranged in each room partitioned by the building concrete 1. For example, the frame plate 4 is mounted on the building concrete 1 on the floor via a liner anchor (stud bolt), and the steel plate liner plate 3 made of carbon steel or stainless steel is supported and welded on the frame plate 4. A heat insulating material 2 is laid between the building concrete 1 and the steel plate liner plate 3.

Further, in the present invention, as shown in FIG. 1, a mixture of a corrosion resistant metal such as nickel and chromium is sprayed on the surface of the steel liner plate 3 to form a sprayed layer 7. The sprayed layer 7 constructed in this way is very hard,
It is possible to walk like on the steel liner plate 3 not subjected to thermal spraying. Further, even though the thermal sprayed layer 7 is quite thin, corrosion resistance can be obtained, which is advantageous for absorbing the difference in thermal expansion from the steel plate liner plate 3, and requires a special structure for absorbing the difference in thermal expansion. do not do.

In the lining equipment as described above, if the liquid metal as the coolant leaks into the air, the liquid metal may react with oxygen or moisture in the air to create a high temperature and strong alkaline environment. Since the corrosion resistance can be ensured by the thermal spray layer 7, breakage of the steel sheet liner plate 3 that is vulnerable to high temperature and strong alkaline environment can be prevented. Therefore, direct contact between the liquid metal and the concrete can be prevented, and safety measures for the fast breeder reactor can be improved.

Also, in the event that a large amount of liquid metal leaks and flows into a conduit for transferring the leaked liquid metal to another chamber, no powder or the like is generated from the sprayed layer 7 so that the liquid metal is not leaked. There is no problem caused by blockage of the tube.

[0018]

As described above in detail, according to the present invention, there is provided a lining facility which is excellent in corrosion resistance to high temperature and strong alkaline environment caused by leakage of liquid metal as a coolant into the air. And improve safety measures of the fast breeder reactor.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a lining facility according to the present invention.

FIG. 2 is a schematic view of a building of a fast breeder reactor.

FIG. 3 is a sectional view showing a conventional lining facility.

FIG. 4 is a graph showing the erosion degree of a practical metal material in a high-temperature concentrated caustic soda solution.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Building concrete 2 ... Heat insulation material 3 ... Steel plate liner plate 4 ... Frame plate 5 ... Equipment 6 ... Piping 7 ... Thermal spray layer

Claims (2)

[Claims] Claims: 1. In a facility such as a nuclear equipment for power generation of a fast breeder reactor, a room or a building in which equipment including liquid metal and piping are arranged, and installed on a concrete surface constituting the room or the building. In a lining facility, the liner used therein has a steel plate liner plate installed on the concrete surface and a corrosion-resistant metal coated on the steel plate liner plate surface. Room for arranging equipment including metal, lining equipment for building concrete. 2. The steel sheet liner plate is made of carbon steel or stainless steel, the corrosion-resistant metal is formed on the steel sheet liner plate surface by thermal spraying, and a heat insulating material is provided between the steel sheet liner plate and the concrete. 2. A lining facility for a concrete building, comprising: a room for arranging devices including liquid metal, etc., which is laid.