JPS5946593A - Sodium equipment surrounding construction for fast breeder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention eliminates guard vessels for sodium equipment in fast breeder reactors, replaces their functions with buildings and structures that take thermal protection measures, and further maintains the atmosphere at a high temperature. This invention relates to structures surrounding sodium equipment in fast breeder reactors that expose sodium equipment and its piping to facilitate design and inspection.

Conventionally, the structure around the high-temperature equipment of a liquid metal cooled fast breeder reactor, including the reactor vessel and its surroundings, is as shown in FIG.

In the figure, 1 is a reactor vessel, and 2 is a guard vessel for storing IJium (in case of sodium leakage from the reactor vessel 1) and ensuring that the liquid level of the system is maintained. 3
is an earthquake-resistant steady rest for the reactor vessel 1 and the guard vessel 2, and the support structure 4 fixed to the floor concrete IJ-) 14 with the embedded metal fittings 5 is used to secure the reactor vessel 1 and the guard vessel 2 during an earthquake. It is configured to restrain the displacement of.

In addition, in the figure, 6 is the body of the guard vessel 2, and 7 is a skirt part for receiving the own weight and seismic force of the guard vessel 2, and is fixed to the sole plate 9 placed on the destabilized object 10 by the 7 run part 8. has been done. Reference numerals 11 and 12 are steel plates, and their circular parts are filled with concrete 13 and 14, respectively.

Further, reference numeral 16 denotes the atmosphere of the furnace vessel chamber, which is normally cooled to protect the wall concrete.

In the above structure, the guard vessel 2 is provided with a heat insulating material 15 to prevent heat radiation from the equipment, and prevents high-temperature gas from leaking into the room from the annular portion between the guard vessel 2 and the reactor vessel l. In order to do this, a seal structure 17 is installed on the top of the guard vessel 2.

However, in the conventional structure described above, ■ structures such as the skirt portion 7, 7, lunge portion 8, sole plate 9, and pedestal 10 are required to support the guard vessel 2; ■ earthquake-resistant steady rests; 3 has a double and complex structure; ■Atmosphere cooling is required to protect the contour due to the thermal shaping of the reactor vessel 1; ■Sodium leaking from guard vessel 2 may cause the atmosphere in the reactor vessel chamber. There are disadvantages such as the need to take measures in case a spray fire or pool fire occurs in a room of 16, the design is highly difficult, the amount of material is large, and the construction period required for installation is also long. However, there were drawbacks such as a large air conditioning load.

The present invention was made to solve the above-mentioned drawbacks of the conventional structure, and eliminates the guard vessel installed in the sodium equipment, and stores the sodium in the room using the surrounding walls and floor. As a high-temperature solution, cooling is a structure that takes thermal protection measures such as directly cooling the concrete, and the structure is simple, reliable, short construction period, and high-speed with less heat loss spent on air conditioning. The purpose of this invention is to provide a structure that has a guard vessel function in a breeder reactor.

Hereinafter, embodiments according to the present invention will be described in detail based on FIG. 2.

In the figure, 20 is a reactor vessel, which has a structure in which a guard vessel is eliminated. 21 is a lower steady rest, 22 and 23 are steel plates, each of which is filled with concrete 24 and 25. A cooling pipe 26 is buried in the concrete 24 and 25 to cool the concrete, and a coolant is constantly supplied. sink,
It is designed to remove heat.

In addition, concrete 24.2 is placed on the surface of the steel plate 22.23.
A heat insulating material 27 is installed to prevent heat from flowing into the device 5, and no heat insulating material is used for equipment or piping.

Note that the upper part of the reactor vessel 20 is supported by an upper end 7 flange (not shown).

Next, the operation of the reactor vessel in the above structure will be explained in detail.

Although the temperature is high, the concrete 24 is heated due to the insulation material 27.
．． Since the heat leakage to 25 is suppressed, concrete 24
．． The amount of heat that must be removed by the cooling pipe 26 for cooling and protecting the cooling tube 25 is small.

Since there is no heat dissipation from the reactor vessel 20, there is less heat loss.

Furthermore, since the cooling pipe 26 does not come into contact with sodium, it is possible to use a refrigerant such as water, which improves the cooling performance and allows the system to be made more compact.

Furthermore, unlike the conventional structure, the atmosphere 28 in the furnace vessel chamber is not cooled, so a cooling system for that purpose is not required.

5- On the other hand, when sodium leaks, sodium leaks into the space of the furnace vessel chamber atmosphere 28;
By limiting the spatial volume of the system, it is possible to prevent excessive sodium leakage from the system and maintain the liquid level.

In addition, in the case of a sodium sedge fire or a pool fire in the space of the furnace vessel chamber atmosphere 28, heat inflow into the concrete is slow due to the insulation material 27, and the cooling pipe 2
By removing heat in step 6, concrete 24.2
5. It is possible to prevent the temperature rise of the steel plates 22 and 23, and it is also possible to remove the heat from the sodium accumulated in the space of the furnace vessel chamber atmosphere 28, and it is possible to quickly calm down the thermal load after a sodium leakage accident. It is.

Furthermore, during regular inspections, equipment and piping are exposed, so
It is less necessary to remove the insulation material, and inspections (
ISIJ, repairs, etc. can be easily performed.

As explained in detail above, the uninvented structure around the reactor vessel of a fast breeder reactor has a structure that does not require a guard 6-vessel or cooling in the atmosphere, and the structure is simplified, allowing the container and This means that the amount of materials will be reduced and the construction period can be expected to be shortened.

1K, it is possible to secure the liquid level in the event of a sodium leak, and it can be protected from hot molds such as concrete and steel plates.

Further, the structure according to the invention has the advantage that periodic inspections, inspections during the service period, etc. can be easily carried out.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a reactor vessel and its surrounding area showing a conventional embodiment, and Fig. 2 is a sectional view of a reactor vessel and its surrounding area showing an embodiment according to the present invention. ...Reactor vessel, 2...Guard vessel,
15.27...Insulating material, 16.28...Furnace vessel chamber atmosphere, 21...Lower steady rest, 22.23...Steel plate, 13
．． 14.24.25...Concrete, 26...Cooling pipe. 7-

Claims (1)

[Claims] A cooling pipe is installed in the concrete of a concrete structure that accommodates sodium equipment without a guard vessel, and a heat insulating material is installed via a steel plate on the wall of the structure facing the IJium equipment. Structures surrounding the sodium equipment of a fast breeder reactor.