JPH0116073Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a liquid metal storage container such as a reactor vessel of a liquid metal cooled fast breeder reactor or an overflow tank.

(Prior art) and (problems to be solved by the invention) In the reactor vessel or overflow tank of a liquid metal cooled fast breeder reactor that uses liquid metal as a coolant, liquid level fluctuations can cause problems near the liquid level. Metals are subject to repeated large thermal stresses, so thermal fatigue failure becomes a problem.

For this reason, as shown in the overflow tank in FIG. 5, a liquid metal storage container has been proposed in which a partition wall 2 made of a thin plate is provided inside the pressure vessel wall 1, and the thin plate reduces thermal stress and the space provides insulation. ing. In the figure, 3 is a liquid metal inlet, and 4 is an overflow nozzle.

However, after long-term use, the inside of the partition wall becomes filled with liquid metal due to condensation of the liquid metal vapor, and the insulation effect is lost.

(Means for Solving the Problems) The present invention was proposed to solve the above problems, and consists of bundling a plurality of hollow circular tubes each filled with inert gas. A heat insulating block formed by loading a bundle of metal into a thin-walled vacuum container so as to be in contact with the inner surface of the container is disposed near the liquid level in the liquid metal storage container. This relates to a liquid metal storage container.

(Function) and (Effects of the Device) As described above, in the present invention, a plurality of hollow circular tubes filled with an inert gas are bundled, and the bundle of hollow circular tubes is placed inside a vacuum container. Since the heat insulating block is placed near the liquid surface of the liquid metal storage container, the high heat insulating effect of the heat insulating block prevents high temperatures near the liquid surface. Condensation of liquid metal vapor does not occur on the walls of the liquid storage container or within the thin partition wall provided within the container, and the liquid metal storage container can maintain its designed performance.

In addition, the bundle of hollow circular tubes packed in the thin-walled vacuum container of the insulation block and filled with inert gas is in contact with the inner surface of the vacuum container, so that the hollow circular tubes are in contact with the inner surface of the vacuum container. The bundle acts as a strength member, and since a plurality of hollow circular tubes are bundled and loaded into a vacuum container, they are bundled together and can be easily handled, and the space created between adjacent hollow tubes makes it easier to handle. The insulation effect is further improved, and since the inside of the container forming the outer shell of the insulation block is vacuum, the insulation block itself can withstand temperature changes.

(Example) The present invention will be described below with reference to the illustrated embodiments.

3 and 4 show an embodiment of the heat insulating block A, in which a plurality of hollow circular tubes 11 filled with an inert gas are bundled, and the bundle of hollow circular tubes 11 is shaped into a rectangular, circular, donut shape, etc. Thin-walled container 12 with arbitrary cross-section shape
The container 12 is then loaded so as to be in contact with the inner surface of the container 12, and the inside of the container 12 is evacuated.

In the heat insulating block A that holds the insulating hollow circular tube 11 filled with an inert gas inside the thin-walled container 12, the hollow circular tube 11 serves as a strength member to maintain the shape of the block itself, and also contains a plurality of hollow tubes. Since the circular tubes 11 are bundled and placed in the vacuum container 12, they can be easily handled together, and the space formed between the adjacent hollow circular tubes 11 enhances the heat insulation effect. Also, since the inside of the container 12 is vacuum,
The insulation block A itself can withstand temperature changes.

In the embodiment shown in FIG. 1, the heat insulating block A constructed as described above is layered between the thin plate partition wall 14 disposed inside the liquid metal container 13 near the liquid level in the container and the inner wall of the container 13. Due to the heat insulating properties of the block A, condensation of liquid metal vapor within the thin plate partition wall 14 does not occur, making it possible for the liquid metal container to maintain its designed performance.

In the figure, 15 is a liquid metal inlet, and 16 is a liquid metal overflow nozzle.

FIG. 2 shows another embodiment of the present invention, in which the heat insulating block A is directly attached to the inner wall of the liquid metal container 13, in which case the partition wall 14 is not required.

In the figure, parts equivalent to those of the above embodiment are given the same reference numerals.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the liquid metal container according to the present invention, FIG. 2 is a longitudinal cross-sectional view showing another embodiment of the liquid metal container according to the present invention, and FIG.
The figure is a partially longitudinal sectional front view of the heat insulating block, FIG. 4 is a partially longitudinal sectional side view thereof, and FIG. 5 is a longitudinal sectional view of a conventional liquid metal container. A...Insulation block, 11...Hollow circular tube, 12
... Thin plate container, 13 ... Liquid metal storage container, 14
...thin plate bulkhead.

Claims (1)

[Scope of utility model registration request] Multiple hollow circular tubes filled with inert gas are bundled together, and the bundle of hollow circular tubes is placed inside a thin-walled vacuum container.
1. A liquid metal storage container, characterized in that a heat insulating block is disposed in the vicinity of a liquid level within the liquid metal storage container, and is formed by being packed so as to be in contact with the inner surface of the container.