JPS6333115B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nuclear reactor containment vessel, and more particularly to a reactor containment vessel suitable for expanding internal space.

In a conventional nuclear reactor containment vessel, vent pipes horizontally penetrate the lower peripheral surface of the dry well wall, and about 120 vent pipes of, for example, 700 ^A are provided. For this reason, the cross-sectional loss due to the bent pipe in the entire cross-section is large, and it is not easy to design it to withstand loads such as earthquakes, pressure, and heat.

Further, in order to communicate the steam in the dry well to the vent pipe, a wear wall has conventionally been provided inside the dry well wall, but this wear wall causes the space in other parts to become narrow.

The present invention has been made to solve these conventional problems, and its purpose is to provide a nuclear reactor containment vessel whose internal space can be expanded.

The present invention focuses on the fact that the conventional difficulty lies in the use of a wear wall placed inside the dry well wall as a means for guiding the steam in the dry well to the vent pipe, and the present invention has been developed by using a wear wall instead of a wear wall. This uses piping that opens into the dry well at one end and communicates with the vent pipe at the other end.

The present invention will be explained below based on the embodiment shown in FIG.

In the figure, 3 is a dry well surrounded by a dry well wall 1, a dry well floor 5, etc., and inside the dry well wall 1, the upper end penetrates the dry well floor 5 and is opened into the dry well 3. In addition, piping 7 is arranged in a substantially vertical direction and communicates with the subression pool 6 via a plurality of vent pipes 2 whose lower ends horizontally penetrate the lower part of the dry well wall 1. As shown in FIG. 1, this piping 7 is integrally constructed with the dry well wall 1 by means of reinforcing concrete 8, which is cast on its outer periphery and constitutes a part of the dry well wall 1.

In the above configuration, the steam released in the event of a rupture accident of the reactor primary system piping in the dry well 3 is
It is led to the sub-reduction pool 6 via the piping 7 and the vent pipe 2, where it is condensed and cooled, thereby suppressing the pressure rise in the dry well 3.

As explained above, according to this embodiment, the piping is provided only in the area corresponding to the vent pipe inside the dry well wall, so compared to the conventional wear wall installed around the inside of the dry well wall, the piping is installed inside the dry well wall. It is possible to expand the space. In addition, since the piping is integrated with the drywell wall using reinforced concrete, the cross section increases, reducing cross section loss due to bent pipes, and plays a reinforcing role against loads such as earthquakes, pressure, heat, etc. Structural strength increases. Moreover, since the piping is not exposed to the outside, the strength against external pressure can be increased.

FIG. 2 shows another embodiment of the invention, which will be described below.

In the figure, 3 is a dry well surrounded by a dry well wall 1, a dry well floor 5, etc., and inside the dry well wall 1, a pipe 17 whose upper end communicates with the dry well 3 is embedded and integrated. It has a structure. The lower end of this piping 17 communicates with the sub-reduction pool 6 via a plurality of horizontal vent pipes 12, one end of which is connected to the piping 17 and the other end of which opens into the sub-reduction pool 6. .

In the above configuration, the steam released in the event of a rupture accident of the reactor primary system piping in the dry well 3 is
It is led to the sub-reduction pool 6 via the piping 17 and the vent pipe 2, where it is condensed and cooled, thereby suppressing the pressure rise in the dry well 3. In addition,
Although an example has been shown in which the dry well 3 is surrounded by the dry well wall 1 and the dry well floor 5, etc.,
The height of the dry well floor 5 can be determined arbitrarily. For example, the height of the dry well floor 5 can be made approximately the same as the floor surface of the sub-recession pool 6.

As explained above, according to this embodiment, since there is no part protruding inside the dry well wall,
The interior space can be significantly expanded.

The present invention has been described above based on preferred embodiments, but according to the present invention, it is possible to expand the internal space.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a main part showing a first embodiment of a nuclear reactor containment vessel according to the present invention, and FIG. 2 is a vertical cross-sectional view of a main part showing another embodiment of the present invention. 1... Drywell wall, 2, 12... Vent pipe, 3
...dry well, 6...subrection pool,
7,17...Piping.

Claims (1)

[Claims] 1 In a reactor containment vessel with a horizontal vent provided at the lower end of the drywell wall to guide steam released in the event of a rupture accident of the reactor primary system piping inside the drywell to the suppression pool, one end opens into the drywell. A nuclear reactor containment vessel characterized in that a pipe is provided whose other end communicates with the horizontal vent, and the pipe is embedded substantially vertically inside a dry well wall.