JPS5830699A - Leak sodium storing device - 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 relates to a leaked sodium storage device suitable for, for example, a fast breeder reactor.

Generally, in fast breeder reactor plants, the heat generated in the reactor is transferred to the steam generator through coolant piping, intermediate heat exchangers, etc., and liquid metal sodium (hereinafter abbreviated as sodium) is used as the heat transport medium. , is widely used.

In such fast breeder reactor plants, sodium is used at very high temperatures (approximately 300°C to 600°C),
Moreover, since 9ram itself is an active substance, it reacts when it comes in contact with air or water, releasing a large amount of energy.

Therefore, in order to minimize the impact on the surrounding area in the event of damage to the reactor cooling system equipment and piping, it is necessary to have a device that quickly stores the leaked cum.

Conventionally, the countermeasures against a sodium leak in a fast breeder reactor were to install a blowout panel on the ceiling of the room that houses the reactor cooling system equipment and piping that contains sodium; , a method is used to suppress the rise in atmospheric pressure in the room to within a certain value to reduce the impact on the building.

In other words, in this method, for example, if high temperature sodium leaks onto the upper surface of the floor of a room; therefore, when the ambient temperature and pressure in the room rises and exceeds a certain value, the blowout panel opens and keeps the ambient temperature and pressure in the room constant. This is a method of reducing the impact on the building by keeping it within the specified value, and can suppress the impact on the room containing the reactor cooling system equipment and piping, and the surrounding rooms to a certain extent.

However, since the leaked sodium heats the atmospheric gas for a long period of time, a large leak of sodium is not allowed due to the heat resistance limit of the building and the capacity of the pull-out panel, and it is also important to consider that the liquid after leaking will solidify. This is not necessarily the best method, as the disposal of leaked sodium becomes extremely troublesome and may require a long period of time to restore the plant.

Therefore, the sodium leaked from the reactor cooling system equipment and piping should be recovered to a fixed location as much as possible, the influence of the leaked sodium on the building should be reduced, and the recovery time of the plant after the sodium leak should be further shortened. There is a need for a device that can do this.

The present invention has been made in response to such conventional circumstances,
leaked into a room containing reactor cooling system equipment and piping)
By making the container that stores 9 um into a double structure and creating a space between it and the building to increase the insulation effect, and by flowing coolant through this area, a room that houses the reactor cooling system equipment and piping can be created. Provides a leaked sodium storage device that can suppress the rise in atmospheric temperature in surrounding rooms and further suppress the rise in temperature of the building, thereby ensuring the integrity of the building and shortening the recovery time of the plant after a sodium leak. This is what I am trying to do.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, details of the present invention will be described with reference to embodiments shown in the drawings.

The leak storage device 1 shown in FIG. 1 has a coolant inlet nozzle 3 and a coolant outlet nozzle 4 facing each other on a flange portion 2m formed at the upper end of a cylindrical inner container 2. Further, the upper surface of the inner container 2 is covered with a flat top lid 6 in which a storage opening 5 of 9 cm (for leakage) is bored.

A cylindrical outer container 7 is provided to cover the inner container 2 with a certain space provided outside the side and lower surfaces of the inner container 2, and a flange 2a at the upper end of the inner container 2 and a flange at the upper end of the outer container 7. Part 7 Otori is closely followed.

The leaked sodium storage device 1 formed in this way is
As shown in the figure, the lowermost part of the delamination layer 12 consists of a reactor cooling system chamber 10 containing reactor cooling system equipment 8 and reactor cooling system piping 9, and a leaked sodium storage chamber 11 provided below the reactor cooling system chamber 10: It is installed in a recessed form.

A leaking sodium leakage hole 13 that opens from the floor surface 10M of the reactor cooling system chamber 10 to the leaked sodium storage opening 5 of the inner vessel 2 is arranged approximately in the center of the 9km storage chamber 11, and is located outside the delamination layer 12. The disposed coolant supply device 14 has a coolant supply pipe 15 equipped with a coolant inlet nozzle 3 at its tip.
However, each of the coolant discharge devices 16 is connected to a coolant discharge pipe 17 having a coolant outlet nozzle 4 at its tip.

Next, the operation of the device according to the above configuration will be explained.

The leaked sodium storage device 1 configured in this manner is used to store reactor cooling system equipment 8 during plant operation and shutdown.
It also stores sodium leaked when damage or breakage occurs in the reactor cooling system piping 9.

When damage or breakage occurs in the reactor cooling system equipment 8 and the reactor cooling system piping 9, the sodium contained therein leaks to the outside.

At this time, the leaked sodium falls onto the floor of the reactor cooling system room 10, and the leaked sodium storage device 1 installed on the floor of the leaked sodium storage room 11 is connected to the leaked sodium storage pipe 13 connected to this floor. will be collected.

In other words, leakage) lium storage pipe 13. The sodium flowing down passes through the leaked sodium storage opening 5 provided in the upper lid 6 and is collected and stored in the inner container 2.

The sodium thus recovered is cooled by the coolant supplied from the coolant inlet nozzle 3 of the coolant supply pipe 15 connected to the coolant supply device 14.

(That is, the coolant leaks from the coolant inlet nozzle 6).The coolant led to the storage device 1 passes through the side and lower spaces using the space between the inner container 2 and the outer container 7 as a flow path, and then flows into the inner container. After cooling the sodium stored in the inner container 2, the sodium reaches the coolant outlet nozzle 4 attached to the upper end of the inner container 2, passes through the coolant discharge pipe 17, and is discharged to the coolant discharge device 16.
(= Therefore, it is discharged.

Therefore, if the space provided between the inner container 2 and the outer container 7 increases the heat insulating effect, C; and if the space is used as a coolant flow path, -.

In the leaked sodium storage device 1 configured as described above, the atmospheric temperature of the leaked sodium storage room 11 and the reactor cooling system room 10 in which the leaked sodium storage device 1 is installed, and the temperature of the building 12. In other words, if the temperature of building 12 becomes too high,
The temperature of the concrete that forms Building 12 becomes high, and as the concrete fibers break down, hydrogen gas flows out from inside the concrete, and this hydrogen gas accumulates, creating a risk of explosion and potentially damaging the integrity of Building 12. becomes stronger, but
This can be reduced.

In addition, since the leaked sodium is collected in a concentrated manner in one place, recovery after the sodium leak can be facilitated.

FIG. 3 shows another embodiment of the present invention, in which the inner container 2
After the sodium leakage, the cooling piping 18 is arranged in a spiral in the space between the and the outer container 7! ! 1 is particularly effective when the coolant supplied from the coolant supply bag [114] is gaseous.

Furthermore, FIG. 4 shows another embodiment of the present invention,
Instead of providing the outer container 7, the building 12 is directly attached to the outer container 7.
The leaked sodium storage device 1 is configured as a leaked sodium storage device 1, and has the advantage that the same effects as the leaked sodium storage device 1 described in FIG. 1 can be obtained, and the outer container 7 is not required.

As described above, according to the leaked sodium storage device of the present invention, it is possible to effectively suppress the rise in temperature of the building due to leaked sodium and maintain the integrity of the building.

In addition, since the leaked sodium is collected centrally at one station, there is little chance of the leaked sodium remaining on the floor of the building, making recovery easier after a sodium leak.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a vertical sectional view showing an embodiment of the leaked sodium storage device of the present invention, and Fig. 2 is a longitudinal sectional view for explaining an embodiment of the application location of the leaked sodium storage device of the present invention. FIGS. 3 and 4 are longitudinal sectional views showing other embodiments of the 9 cum storage device of the present invention, respectively. 2...Inner container 6...Coolant inlet nozzle 4...Coolant outlet nozzle 5...Leaked sodium storage opening 6...
・Top lid 7 ... Outer container (7317) Representative patent attorney Noriyuki Chika (and 1 other person)

Claims (1)

[Claims] 1. #! an inner container for accommodating sodium leakage, an outer container surrounding the inner container, a coolant supply device for supplying a coolant to a space between the inner container and the outer container, and a space between the inner container and the outer container. A leaked sodium storage device comprising: a coolant discharge device for discharging flowed coolant. 2. The leaked sodium storage device according to claim 1, wherein a cooling pipe for circulating a coolant is disposed in the space between the inner container and the outer container. & The leaked sodium storage device according to claim 1 or 2, wherein the outer container is a recess formed in the floor of the building.