JPS6325311B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a nuclear reactor building that can prevent equipment important for safety from being submerged in water from a large amount of water flowing out when a pipe ruptures.

[Technical background of the invention and its problems] Equipment important for safety such as the emergency core cooling system in conventional nuclear power plants (hereinafter simply referred to as in-house equipment) is separated in each section in the reactor building. Separately placed. Along with this, drainage systems have also been installed for each division. Therefore, even if a pipe rupture occurs in a room where certain equipment is installed and the equipment in that room is submerged in water, the equipment in other rooms will not be submerged in water. However, if a pipe break occurs on a floor above a room where laboratory equipment is located, there is a risk that water leaking from the pipe break may enter the room below where laboratory equipment is located. Ta.

[Purpose of the invention]

The present invention takes into account the difficulty of independent and separation of the drainage system in a reactor building, and the present invention has been designed to limit the range of influence when water flows out due to pipe rupture in areas where in-house equipment is installed and other areas. The purpose is to provide a reactor building that can be maintained at

[Summary of the invention]

The present invention provides an in-house equipment room arranged on the lowest floor of a building and housing in-house equipment therein; It consists of a drainage pit room that is open to the floor, and a drainage pit that is housed within this drainage pit room and is formed at a position lower than the equipment installation level in the facility equipment room. The reactor building is characterized in that the floor of the chamber is sloped toward the opening communicating with the drainage pit chamber.

[Embodiments of the invention]

The first aspect of the present invention will be described below with reference to FIGS. 1 to 2.
An example will be explained. FIG. 1 is a longitudinal sectional view of a nuclear reactor building showing the main parts of the present invention. In the figure, a drainage pit room 2 is located on the lowest floor of the reactor building 1, and is equipped with internal equipment (in this example, the emergency core cooling system will be explained).
It is provided separately and independently from the in-house equipment room 4 in which 3 is placed. A drainage pit 5 is installed in this drainage pit chamber 2. Drainage pipes 6 on each floor other than the lowest floor are led to a drainage pit 5 without passing through the station equipment room 4 in which the station equipment 3 is arranged.
This drain pit 5 is provided with a drain pump 7 for discharging the waste water collected by a drain pipe 6. Further, a part of the upper part of the drainage pit chamber 2 is open to the upper floor, and an opening 9 is provided which extends a staircase 8 from the drainage pit chamber 2 and also serves as an opening for the stairs. ing. Further, in a corner of the reactor building 1, a stair room 21 is provided with stairs connected to entrances and exits 23 on each floor through which workers enter and exit.

Here, the structure of the floor one floor above the bottom floor (hereinafter referred to as the upper floor) will be explained with reference to FIG. This figure is a view taken along the line A--A in FIG. 1. In the figure, the entire floor 10 on the upper floor is sloped, so that leaked water is guided to the drainage pit 5 without passing the drainage pipe 6 to the laboratory equipment room 4 where the laboratory equipment 3 is located on the lowest floor. It is now possible to collect them. The slope applied to the floor 10 of this upper floor is applied in the direction of the opening 9 as shown by the arrow in the figure. Normally, waste water is collected into the drain pit 5 by a drain groove 11 provided near the opening 9 and a saucer (not shown) within the drain groove 11 without leaking into the opening 9. On the other hand, if a large amount of water leaks from the upper floor due to some cause such as a pipe breakage, this leaked water will flow directly into the drain pit chamber 2 through the opening 9 over the drain groove 11. The size of this drainage pit chamber 2 is determined depending on the expected maximum outflow amount. When piping breaks, etc.
If a large amount of leaked water flows into the drainage pit chamber 2, the normal drainage pump 7 will become inoperable due to flooding, etc., so a large capacity pump 12 is installed at the upper part of the drainage pit chamber 2. In addition, when a large amount of wastewater is collected in the drainage pit room 2, it is used as an emergency water source by guiding the wastewater to the emergency tank 13 installed on the upper floor of the reactor building 1 by a large-capacity pump 12. It is also possible to do so.

With the above configuration, even if a large amount of leaked water occurs above the lowest floor due to pipe breakage, etc., the waste water can be collected into the drain pit 5 without submerging the in-house equipment 3.

Next, a second embodiment of the present invention is shown in FIG. FIG. 3 is a partial cross-sectional view of the floor showing the drainage equipment on the floors above the bottom floor of the reactor building. As shown in the figure, a large number of drainage trays 14 are provided at arbitrary positions on the floor in place of the slope. A drain pipe 15 is connected to the drain tray 14 and is buried in the floor 10 of the upper floor, and the drain pipe 15 is led to the drain pit 5. This configuration makes it possible to collect wastewater without passing through the facility equipment room 4 in which the facility equipment 3 is located on the first floor.

A third embodiment of the present invention is also shown in FIGS. 4 and 5.
This will be explained with reference to the figures. Here, FIG. 4 is a partial longitudinal sectional view of a reactor building showing a third embodiment of the present invention,
FIG. 5 is a view taken along the line B--B in FIG. 4. In FIG. 4, a part of the upper part of the drainage pit chamber 2 is extended to the uppermost chamber of the reactor building 1 to form a duct 17, and an opening 18 is provided at each floor of the reactor building 1. The floor 19 of the room in which the opening 18 is provided has a slope, and this slope is directed toward the opening 18 as indicated by the arrow in FIG. If a breakage accident occurs on a floor above the bottom floor due to this slope, and drainage becomes impossible in the drains on each floor, the leaked water will be immediately discharged from the opening 18 and drained into the drainage pit 20. Ru. Furthermore, the fifth
In the figure, the reference numeral 22 is a stairwell provided with stairs for workers to enter and exit on each floor.

〔Effect of the invention〕

According to the present invention, even if a large amount of leakage water occurs due to a breakage accident on the floor above the lowest floor, the leaked water can be quickly drained from each floor and collected in the drainage pit, thereby preventing flooding of equipment in the facility.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical sectional view showing a first embodiment of a nuclear reactor building of the present invention, FIG. 2 is a view taken along the line A-A in FIG. 1, and FIG. 3 is a second embodiment of the present invention. FIG. 4 is a partial longitudinal sectional view of a reactor building showing the third embodiment of the present invention, and FIG.
-B arrow view. 1...Reactor building, 2...Drainage pit room, 5...
... Drain pit, 6... Drain pipe, 11... Drain groove, 15... Drain pipe, 20... Drain pit.

Claims (1)

[Scope of Claims] 1. An internal equipment room located on the lowest floor of the building and housing important safety equipment in the nuclear power plant; It consists of a drainage pit room whose upper part is open to at least one floor above, and a drainage pit housed within this drainage pit room and formed at a position lower than the equipment installation level in the facility equipment room. A nuclear reactor building characterized in that a floor of a room in which a part of the upper part of the drainage pit chamber is open is sloped toward an opening communicating with the drainage pit chamber. 2 The drainage pit room installed on the lowest floor of the building is located at a level one step lower than the level of other rooms on the lowest floor, and is characterized by being divided into one room or multiple rooms on the first floor of the building. A nuclear reactor building according to claim 1.