JP4467531B2 - Reactor building - Google Patents

Description

  The present invention relates to a nuclear reactor building including a nuclear reactor containment vessel and an equipment room associated therewith in a nuclear power plant such as a nuclear power plant equipped with a boiling water reactor.

  An improved BWR (hereinafter referred to as ABWR) is known as the latest of conventional boiling water reactors (hereinafter referred to as BWR). This ABWR employs a reinforced concrete reactor containment vessel (hereinafter referred to as RCCV), and the reactor building is composed of an RCCV and an equipment room, a penetration room, etc. arranged around the RCCV.

  The following methods are known as methods for reducing the size of the reactor building. That is, an equipment room in which the upper dry well is a double wall, a penetration room is formed between the inner and outer walls, and an emergency core cooling system pipe is disposed in the lower part of the pressure suppression chamber via a pool in the pressure suppression chamber. Pull around. By this method, the equipment room area around the RCCV can be reduced, which leads to downsizing of the building (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 10-282285

Miniaturization of the reactor building is effective in realizing a more economical reactor building. In the reactor building in the current ABWR, an equipment room is arranged around the RCCV, and the flat area of the reactor building is determined from the diameter of the RCCV and the required area of the equipment room. However, it is difficult to further reduce the diameter of the RCCV and the required area of the equipment room.

  On the other hand, the piping of the emergency core cooling system in the reactor building is required to have high seismic resistance, so the piping length should be shortened as much as possible to reduce the amount of piping and supporting materials. The pipe length is increased because of the arrangement.

  Accordingly, an object of the present invention is to provide a more economical reactor building that can achieve downsizing of the reactor building and minimization of the piping of the emergency core cooling system.

Means for achieving the object of the present invention includes a reactor containment vessel containing a reactor pressure vessel, an upper dry well surrounding the reactor pressure vessel, and the reactor pressure located below the upper dry well. A lower dry well positioned below the vessel, a pressure suppression chamber positioned around the lower dry well, a vent pipe for guiding the vapor flowing into the upper dry well to the pressure suppression chamber, and the reactor pressure In the reactor building comprising a pedestal that supports a vessel in the reactor containment vessel, and an emergency core cooling system that connects the pressure suppression chamber and the reactor pressure vessel through a water injection pipe, A device chamber that is disposed around the well and below the pressure suppression chamber, and stores the device; the water injection pipe is disposed in the device chamber and the pedestal; The nuclear reactor is characterized in that the equipment room is arranged through a penetration chamber through which the water injection pipe is passed horizontally outside the dry well, and the penetration room is arranged so as to overlap the pedestal in the vertical direction. It is a building .

  According to such a reactor building, an equipment room including emergency equipment is installed in the lower part of the RCCV internal pressure suppression room, and the RCCV and the equipment room are accommodated in the same projection plane, thereby reducing the area of the reactor building. More specifically, the installation space for the emergency core cooling system piping is secured in the pressure vessel pedestal that supports the reactor pressure vessel, thereby minimizing the piping route of the emergency core cooling system. The reactor building can be achieved at the same time.

  According to the present invention, a more economical reactor building can be provided by downsizing the reactor building and minimizing the water injection piping route from the suppression pool in the pressure suppression to the reactor pressure vessel.

In the embodiment of the present invention, the object of the present invention is achieved by the following method.
(1) The equipment room 8 is installed below the suppression pool 6 in the pressure suppression room 22, and equipment such as an emergency core cooling system pump is installed in the equipment room 8.
(2) An emergency core cooling system pipe 13 that connects the suppression pool 6 in the pressure suppression chamber 22 and the reactor pressure vessel 2 is built in the pressure vessel pedestal 5 that supports the reactor pressure vessel.
(3) The penetration chamber 9 is installed below the pressure vessel pedestal 5 so as to overlap the pressure vessel pedestal 5.

An example of an embodiment of a reactor building according to the present invention is shown in FIG. As shown in FIG.
The RCCV 1 includes a reactor pressure vessel 2, and has an upper dry well 3 on the upper side of the RCCV 1 and a lower dry well 4 on the lower side of the reactor pressure vessel 2.

  The lower dry well 4 is provided with a pressure vessel pedestal 5 that supports the reactor pressure vessel 2 and a vent pipe 7 for guiding high-temperature and high-pressure steam generated in the dry well to the suppression pool 6 in the pressure suppression chamber 22. Yes.

  Also, an equipment room 8, a penetration room 9, an emergency core cooling system pump 10, etc. are installed below the suppression pool 6 in the pressure suppression chamber 22 that condenses high-temperature and high-pressure steam and serves as a water source for the emergency core cooling system. ing. The emergency core cooling system pump 10 and the emergency core cooling system pipe 13 are the main components of the emergency core cooling system.

  The main steam pipe 11 and the water supply pipe 12 are routed through the wall of the RCCV 1 and connected to the turbine building after being routed through the upper dry well 3 as usual in consideration of minimizing the pipe connection with the turbine building.

  Thus, the RCCV 1, the equipment room 8, the penetration room 9, the emergency core cooling system pump 10, and the like are installed vertically within the same projection area, so that a flat and compact building configuration is possible.

  On the other hand, the emergency core cooling system piping 13 uses the suppression pool 6 in the pressure suppression chamber 22 as a water source, penetrates the bottom of the suppression pool 6 in the pressure suppression chamber 22 with piping, and is installed in the equipment chamber 8. It reaches the cooling system pump 10. Further, it is connected to the reactor pressure vessel 2 via an emergency core cooling system piping space 14 built in the penetration chamber 9 and the pressure vessel pedestal 5.

  An example of a pressure vessel pedestal incorporating an emergency core cooling system pipe is shown in FIG. A vent pipe 7 is installed in the pressure vessel pedestal 5 to guide the high-temperature and high-pressure steam generated in the dry well to the suppression pool in the pressure suppression chamber 22, and the space between the vent pipes 7 is used as an emergency core. A space for the cooling system pipe 13 is provided.

  The pressure vessel pedestal having such a structure is adopted, and the route of the emergency core cooling system piping 13 can be further shortened. Furthermore, the route of the emergency core cooling system piping 13 does not pass through the outside of the RCCV, and the penetration chamber is disposed below the suppression pool 6 in the pressure suppression chamber 22, so that the emergency core disposed around the conventional RCCV is used. The space of the core cooling system piping 13 and the penetration space can be deleted.

  These spaces can be used effectively as installation areas for other equipment, or simply by using a communication passage around the RCCV, so that the degree of freedom in plant layout can be increased, and even more of the reactor building floor area can be increased. Reduction can also be realized.

  As a secondary effect of the present embodiment, the emergency core cooling system pipe 13 is mostly routed in the RCCV1, so that the potential of pipe breakage outside the RCCV1 is greatly reduced, and the penetration chamber 9 is consolidated. By installing, it is possible to simplify the pressure test and leak resistance test, and to reduce the amount of shielding and exposure by intensive shielding measures.

  Further, the emergency core cooling system pump 10 installed in the equipment room 8 is installed in the lower part of the suppression pool 6 in the pressure suppression chamber 22 and can secure a sufficient necessary suction head from the suppression pool in the pressure suppression chamber 22. Therefore, it is possible to replace the conventional vertical pump with a horizontal pump, and there is a merit in terms of space and maintenance such that maintenance inspection can be performed on the same floor of the pump.

  FIG. 3 is a diagram showing a plane of the lowest basement floor of the reactor building according to the present embodiment. A cylindrical wall 16 extending from the RCCV to the foundation is installed inside the reactor building 15, and the equipment room 8 is installed inside the wall. The equipment room 8 is provided with a separation wall 17 as required in response to a system separation request. A penetration room 9 is installed inside the equipment room, and a shielding wall 21 is installed according to the shielding requirement.

  Thus, since the equipment room 8 and the penetration room 9 are installed within the projected area of the RCCV1, the plan dimension of the building can be reduced reasonably, and the space between the reactor building 15 and the RCCV1 is a staircase. Since only the room and the passage space for access can be provided, the building can be greatly downsized.

  FIG. 4 shows the RCCV 1 of the first embodiment in which a floor 18 is installed in the lower dry well 4 and the lower dry well 4 is partitioned into two upper and lower spaces in a watertight manner. The upper space leads to a return line 19. Yes. In the event of an accident such as a pipe breakage in the main steam pipe 11 or the feed water pipe 12, the emergency core cooling system acts, and the water in the suppression pool 6 in the pressure suppression chamber 22 is cooled by the emergency core cooling system pump 10 as the reactor water pressure. It is supplied to the container 2.

Thereafter, the cooling water stays in the lower dry well 4 and reaches the suppression pool in the pressure suppression chamber 22 via the return line 19. When the volume of the lower dry well is large, the volume of water staying in the lower dry well increases, and the amount of suppression pool water in the pressure suppression chamber 22 that is the water source of the emergency core cooling system decreases.

  In such a case, it is necessary to store water to be poured into the lower dry well 4 at the time of an accident in the upper dry well 3 or the like, for example, which becomes a factor that hinders downsizing of the building.

  Therefore, the floor 18 installed in the lower dry well 4 reduces the volume of the space in which the water in the lower dry well 4 accumulates, and there is no need to store water above the lower dry well 4. The lower space 20 below the floor 18 divided from the upper space of the lower dry well 4 can be used as, for example, a sump chamber in which a sump is installed.

  On the other hand, the installation height of the floor 18 may be set so that a control rod extraction space can be secured in the lower dry well 4, so that the control rod can be extracted without any problem even if the volume of the lower dry well 4 is reduced. Further, the access route to the lower dry well 4 can be secured by providing a tunnel extending from the outside of the RCCV 1 through the suppression pool 6 in the pressure suppression chamber 22 to the lower dry well 4 as in the conventional ABWR.

  The present invention is applied to a nuclear power plant reactor building.

1 is a longitudinal sectional view of a reactor building according to a first embodiment of the present invention. It is a cross-sectional view of the pressure vessel pedestal of FIG. FIG. 2 is a cross-sectional view of the reactor building of FIG. 1 at the equipment room height level. It is a longitudinal cross-sectional view of the reactor building by 2nd Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Reactor containment vessel, 2 ... Reactor pressure vessel, 3 ... Upper dry well, 4 ... Lower dry well, 5 ... Pressure vessel pedestal, 6 ... Suppression pool, 7 ... Vent pipe, 8 ... Equipment room, 9 ... Penetration Chamber 10 Emergency core cooling system pump 11 Main steam piping 12 Water supply piping 13 Emergency core cooling piping 14 Emergency core cooling piping space 15 Reactor building 16 Cylindrical Shape wall, 17 ... separation wall, 18 ... floor, 19 ... return line, 20 ... lower space of floor, 21 ... shielding wall, 22 ... pressure suppression chamber.

Claims (3)

A reactor containment vessel containing a reactor pressure vessel, an upper dry well surrounding the reactor pressure vessel, a lower dry well located below the upper dry well and below the reactor pressure vessel, and A pressure suppression chamber located around the lower dry well; a vent pipe for guiding the vapor flowing into the upper dry well to the pressure suppression chamber; and a pedestal for supporting the reactor pressure vessel in the reactor containment vessel And a reactor building comprising an emergency core cooling system that connects the pressure suppression chamber and the reactor pressure vessel via a water injection pipe,
A device room is disposed around the lower dry well and below the pressure suppression chamber, and stores a device. The water injection pipe is disposed in the device chamber and the pedestal, and is disposed horizontally outside the lower dry well. The reactor room is disposed through a penetration chamber through which the water injection pipe is passed, and the penetration chamber is disposed so as to overlap the pedestal in the vertical direction. A reactor containment vessel containing a reactor pressure vessel, an upper dry well surrounding the reactor pressure vessel, a lower dry well located below the upper dry well and below the reactor pressure vessel, and A pressure suppression chamber located around the lower dry well; a vent pipe for guiding the vapor flowing into the upper dry well to the pressure suppression chamber; and a pedestal for supporting the reactor pressure vessel in the reactor containment vessel And a reactor building comprising an emergency core cooling system that connects the pressure suppression chamber and the reactor pressure vessel via a water injection pipe,
It is arranged around the lower dry well and below the pressure suppression chamber, and has an equipment room for housing equipment, the water injection pipe is arranged in the equipment room and the pedestal, and the pressure vessel pedestal has the A lower line is provided with a return line serving as a water channel connecting the lower dry well and the pressure suppression chamber, and the lower dry well is partitioned into a plurality of spaces including at least one space communicating with the return line. The equipment room is arranged through a penetration chamber that is installed in a dry well and the water injection pipe is passed through the horizontal outside of the lower dry well, and the penetration chamber is arranged to overlap the pedestal in the vertical direction. Reactor building, characterized by 3. The nuclear reactor building according to claim 2, wherein the lower dry well, the penetration room, and the equipment room are partitioned by a wall.

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