JP2001221880A - Reactor building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem, where in the outflow accident of a molten fuel, vapor is guided to a containment-vapor condensation device 11 from a lower-part dry well 6 through an upper-part dry well 5. SOLUTION: An access tunnel 8 connected to the lower-part dry well 6 and the condensation device 11 are connected with a vapor suction pipe 13. Thereby in the outflow accident of the molten fuel, the vapor in the lower-part dry well 6 can be guided to the condensation device 11 to be condensed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a reactor building of a boiling water reactor.

[0002]

2. Description of the Related Art Generally, a nuclear reactor is housed in a reactor building. Hereinafter, a conventional example of a reactor building will be described with reference to FIG. In the nuclear reactor, steam generated in a reactor pressure vessel 3 containing a reactor core is guided from the reactor pressure vessel 3 to a turbine (not shown) by a main steam pipe 4 for use in power generation and the like. The reactor containment vessel 2 houses the reactor pressure vessel 3 and has a function of confining radioactive substances flowing out of the reactor pressure vessel 3 in the event that the main steam pipe 4 or the like is broken. ing. Further, the reactor containment vessel 2 is housed in the reactor building 1, and a secondary containment facility 9 is installed in the reactor building 1 so as to surround the reactor containment vessel 2. The structure is such that even if a small amount of radioactive material leaks from the containment vessel 2, it can be confined in the secondary containment facility 9.
The walls and the like constituting the secondary storage facility 9 are shown with broken lines in FIG.

[0003] The reactor containment vessel 2 comprises an upper dry well 5 on the outer periphery of the reactor pressure vessel 3, a lower dry well 6 below the reactor pressure vessel 3, and an independent space.
The suppression pool 7 has a large amount of water and a gas phase space inside. The lower drywell 6 accommodates a control rod driving device (not shown) for inserting and removing control rods. An access tunnel 8 is provided for checking and maintaining these devices.
You can enter from outside. The upper dry well 5 and the lower dry well 6 communicate with each other through a communication hole (not shown).

[0004] If the main steam pipe 4 or the like is broken, a large amount of steam is released into the upper dry well 5 together with radioactive substances, and the pressure and temperature in the upper dry well 5 increase. Containment vessel 2 due to pressure rise and temperature rise
The discharged high-temperature steam is introduced into the suppression pool 7 water together with the nitrogen gas filled in the upper dry well 5 through a vent pipe (not shown) so that the confining function of the gas is not lost. Here, the steam is deprived of heat and condenses. The steam from the break continues to flow further into the upper dry well 5, but moves into the suppression pool 7 water following the same process.

In recent years, there has been a great interest in ensuring high safety of a nuclear power plant even for an event having a very low probability called a severe accident exceeding a design standard event. In the event of a severe accident, the dynamic equipment may not function, and the introduction of a static heat removal system instead is considered to be an effective means. Equipment for removing heat of the reactor pressure vessel 3 established as such a static heat removal system will be described with reference to FIG.

[0006] The reactor steam condensing device 21 is installed in a reactor steam condensing device pool 22 and is immersed in water stored in the reactor steam condensing device pool 22. When the pressure of the reactor pressure vessel 3 rises, the steam is guided to the reactor steam condensing device 21 through a main steam pipe 4 by a pipe 23, and is cooled and condensed by water in a pool 22 for the reactor steam condensing apparatus. Then, it is returned to the reactor pressure vessel 3 by the return pipe 24. Thus, the reactor steam condensing device 21 is required to be installed above the reactor pressure vessel 3 in order to return the water condensed with steam to the reactor pressure vessel 3 by gravity.

As one form of severe accident, it is assumed that the core fuel is damaged and the molten fuel flows out of the containment vessel 2. In this case, the molten core is injected and cooled by a separately provided injection means.
A large amount of steam is generated, and the temperature inside the reactor containment vessel 2 becomes high temperature and pressure. The generated steam is guided to the suppression pool 7 by the vent pipe and condensed as described above. At this time, the water in the suppression pool has already become high temperature due to the heat removal from the reactor containment vessel 2 and the generated steam is generated. It is also assumed that the function of condensing the vapor cannot be sufficiently exhibited. For this reason, it is effective to use the PCV vapor condensing device 11 installed in the reactor building 1 shown in FIG.

The containment vessel vapor condenser 11 is provided in the containment vessel condenser 12 pool and is immersed in the water stored in the containment vessel condenser 12. The containment vessel vapor condenser 11 is connected to the upper dry well 5 by a vapor suction pipe 13. Upper dry well 5
Is generated by the steam suction pipe 13 to the containment vessel steam condensing device 11, and is cooled and condensed by the water in the containment vessel steam condensing device pool 12. The containment vessel vapor condenser 11 and the suppression pool 7 are connected by a condensed water return pipe 15 whose tip is buried in the suppression pool 7 water, and the condensed water is guided to the suppression pool 7. A discharge pipe (not shown) for discharging the non-condensable gas accumulated in the containment vessel vapor condenser 11 into the suppression pool 7 water is provided from the containment vessel vapor condenser 11 to the suppression pool 7 at the tip thereof. It is connected to be buried.

It is extremely rare that the containment vessel steam condenser 11 and the reactor steam condenser 21 are in use at the same time. Therefore, they are usually installed in the same pool for the purpose of sharing a water source. Therefore, the pool is the containment vapor condenser 1
1 and a pool common to the reactor steam condensing device 21 are installed above the reactor containment vessel 2.

[0010]

In the event that the molten fuel flows out of the reactor pressure vessel 3 as described above, the molten fuel may fall into the lower dry well 6 in some cases. Therefore, the steam generated for cooling the molten fuel also fills the lower dry well 6. However, in the conventional reactor building described above, since the PCV vapor condensing device 11 draws steam from the upper dry well 5, the steam in the lower dry well 6 reaches the upper dry well 5 through the communication hole, Thereafter, it must be drawn into the containment vessel vapor condenser 11 for condensation, which is not efficient.

In a reactor building disclosed in Japanese Patent Application Laid-Open No. 10-282284, in which an upper dry well and a lower dry well are separated from each other to increase the electric output without increasing the size of a reactor containment vessel, Steam from the lower drywell to the containment vapor condenser had to be provided with a steam suction pipe passing through the upper drywell. For this reason, there is a possibility that the upper dry well and the lower dry well communicate with each other due to damage to the steam suction pipe.

The present invention has been made in view of such a conventional situation, and a reactor capable of efficiently drawing in and condensing steam generated during an accident in which molten fuel flows out of a reactor pressure vessel. The purpose is to provide a building.

[0013]

In order to achieve the above object, in the reactor building according to the present invention, according to the first aspect of the present invention, a reactor pressure vessel containing a reactor core and the reactor pressure vessel are housed. A containment vessel, an upper dry well on the outer periphery of the reactor pressure vessel, a lower dry well below the reactor pressure vessel, a suppression pool on the outer circumference of the lower dry well for storing water therein, An access tunnel communicating the outside of the reactor containment vessel and the lower drywell, a containment vessel condenser for condensing steam generated in the containment vessel, and a containment vessel condenser for storing water therein. In a reactor building including a pool for a containment vessel steam condenser that is submerged and stored, steam for connecting the access tunnel and the containment vessel steam condenser is provided. Characterized in that it has set up a write pipe.

In the reactor building having the above-mentioned structure, the steam generated in the lower dry well in the event of a severe accident such as the outflow of molten fuel is efficiently guided to the containment vessel steam condensing device without passing through the upper dry well and condensed. Further, in the invention according to claim 2, the reactor pressure vessel containing the reactor core, the reactor containment vessel containing the reactor pressure vessel, the upper dry well on the outer periphery of the reactor pressure vessel, A lower dry well below the reactor pressure vessel, a suppression pool on the outer periphery of the lower dry well for storing water therein, and a containment vessel vapor condensing device for condensing steam generated in the containment vessel; A containment vessel condenser for storing water and submerging and storing the containment vessel vapor condenser in a reactor building. A steam suction pipe which is provided to penetrate the suppression pool by being buried in the water stored in the pool and connecting the lower drywell and the containment vessel steam condenser.

In the reactor building having the above structure, when a severe accident such as a molten fuel spill occurs, the steam generated in the lower dry well can be efficiently guided to the containment vessel steam condensing device and condensed by the suppression pool water. Can be cooled.

According to the third aspect of the present invention, the first aspect of the present invention is provided.
Alternatively, in the reactor building according to claim 2, the containment vessel vapor condensation pool is installed around the reactor containment vessel.

In the reactor building having the above configuration, the containment vessel vapor condensing device and the access tunnel or the lower drywell can be connected by a short steam suction pipe, and the steam can be more efficiently led to the containment vessel vapor condensing device. Can be.

According to the fourth aspect of the present invention, there is provided the first aspect.
Alternatively, the reactor building according to claim 2, further comprising a reactor secondary containment facility which is installed around the reactor containment vessel and has an inside thereof serving as a radiation control area, and wherein the containment vessel vapor condensing device pool is provided with the reactor. It is characterized by being installed outside the secondary containment facility.

In the reactor building having the above-mentioned structure, the containment vessel vapor condenser can be set as a non-radiation control area, so that it is possible to avoid exposure during inspection of the containment vessel vapor condenser and to make the containment vessel vapor condenser smaller. Since the steam generated from the storage pool can be made clean without radioactive substances, safety can be improved.

According to the fifth aspect of the present invention, in the first aspect,
In the nuclear reactor building according to any one of claims 4 to 6, a steam suction pipe for the upper dry well that connects the upper dry well and the containment vessel vapor condensing device is provided.

In the reactor building having the above structure, in addition to the condensation of the steam generated in the lower dry well, the steam generated in the upper dry well can be condensed by the containment vessel vapor condensing device.

According to the sixth aspect of the present invention, the fifth aspect of the present invention is provided.
In the reactor building described in the above, a stop valve provided in the steam suction pipe connecting the lower drywell and the containment vessel steam condenser, and a stop valve provided in the upper drywell steam suction pipe It is characterized by being installed.

In the reactor building having the above structure, the steam can be smoothly guided from both the upper dry well and the lower dry well to the containment vessel vapor condensing device.

According to the seventh aspect of the present invention, in the first aspect,
In the reactor building according to any one of claims 6 to 6, the reactor steam condensing device for condensing steam in the reactor pressure vessel to reduce the pressure, and the reactor steam condensing device for water stored therein. A reactor steam condenser pool for submersion and storage, a communication pipe connecting the reactor steam condenser pool and the containment condenser pool, and a shutoff device provided in the communication pipe were installed. It is characterized by the following.

In the reactor building having the above structure, when the water in the containment vessel steam condenser pool is depleted, the water stored in the reactor steam condenser pool is guided to the containment vessel condenser condenser pool. In addition, the containment vessel vapor condenser can be continuously operated.

Further, according to the invention described in claim 8, according to claim 7,
In the reactor building according to the above, the steam generated in the containment vessel steam condenser pool having an open end at a position higher than the surface of the water stored in the reactor steam condenser pool is discharged outside the reactor building. A discharge pipe is provided.

In the reactor building having the above structure, it is possible to prevent water in the reactor steam condenser pool from flowing out of the reactor building via the connecting pipe and the containment vessel condenser condenser pool.

According to the ninth aspect of the present invention, the seventh aspect of the present invention is provided.
The opening and closing of the shut-off device is controlled based on the water level of the pool for the containment vessel vapor condensing device.

In the reactor building having the above configuration, it is possible to prevent the pool water for the containment vessel steam condensing device from running out and the outflow of water from the reactor steam condensing device pool.

According to a tenth aspect of the present invention, in the reactor building according to any one of the first to ninth aspects, a means for isolating the upper dry well and the lower dry well is provided. And

In the reactor building having the above structure, it is possible to increase the electric output and condense steam by the containment vessel vapor condensing device at the time of an accident without increasing the size of the containment vessel. In addition, since the steam suction pipe from the lower dry well does not pass through the upper dry well, there is no danger that the lower dry well and upper dry well communicate with each other even if the containment vessel vapor condenser is installed. The dry well can reliably function as an isolated containment vessel.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a reactor building according to the present invention will be described below with reference to FIG. FIG. 1 is a sectional view of a reactor building according to the present embodiment. In FIG. 1, a reactor building 1 houses a reactor containment vessel 2. The reactor containment vessel 2 houses a reactor pressure vessel 3 containing a reactor core. Steam generated in the reactor pressure vessel 3 is guided from the reactor pressure vessel 3 to a turbine (not shown) by the main steam pipe 4. Further, the main steam pipe 4 is branched on the way and becomes a steam suction pipe 23 as a reactor steam condensing device 21.
It is connected to the. Normally, the main steam pipe 4 and the reactor steam condensing device 21 are isolated from each other by a valve (not shown) provided in the steam suction pipe 23.

The reactor steam condensing device 21 is immersed in water stored in a reactor steam device pool installed above the reactor pressure vessel 3. Reactor steam condenser 2
Reference numeral 1 denotes a condensed water return pipe 20 for returning condensed water to the reactor pressure vessel 3 and is connected to the reactor pressure vessel 3.

The inside of the reactor containment vessel 2 contains the reactor pressure vessel 3
It is partitioned into an upper dry well 5 on the outer periphery and a lower dry well 6 below the reactor pressure vessel 3 and is connected to each other by a communication hole (not shown). A suppression pool 7 is provided around the outer periphery of the lower dry well 6, and stores water for condensing steam guided from a vent pipe (not shown) from the upper dry well 5 or the lower dry well 6 at the time of an accident. The lower drywell 6 and the space outside the reactor containment vessel 2 are connected by an access tunnel 8 constructed in a suppression pool 7, and the inside of the access tunnel 8 is a space integrated with the lower drywell 6.

The reactor containment vessel 2 is surrounded by a reactor secondary containment facility 9 composed of walls and the like shown by adding broken lines to FIG. A containment vessel vapor condenser pool 12 is installed in the management area, and the containment vessel vapor condenser 11 is accommodated therein. The containment vessel steam condenser pool 12 is independent of the reactor steam condenser pool 22. One end of the steam suction pipe 13 is connected to the inside of the access tunnel 8, and the other end is connected to the containment vessel steam condenser 11.

At this time, by installing the containment vessel vapor condenser 11 on the side of the reactor containment vessel 2, the containment vessel vapor condenser 11 can be located near the access tunnel 8. As a result, the length of the steam suction pipe 13 can be reduced.

A condensed water return pipe 14 for returning the condensed water generated in the containment vessel vapor condenser 11 to the suppression pool 7 extends from the containment vessel vapor condenser 11 through the wall of the reactor containment vessel 2 to the suppression pool. 7 is buried in the suppression pool 7 water. Further, in order to prevent non-condensable gas such as nitrogen gas from staying inside the containment vessel vapor condenser 11, a vent pipe (not shown) is connected to the suppression pool 7 from the gas space of the containment vessel vapor condenser 11. The tip is buried in the suppression pool 7 water.

In the present embodiment configured as above, when a severe accident occurs such that the molten fuel falls into the lower drywell 6, water injection cooling is performed by a separately provided water injection means. As a result, when a large amount of steam is generated in the lower dry well 6, the steam is also immediately filled in the access tunnel 8 communicating with the lower dry well 6.
The steam in the access tunnel 8 is guided to the containment vessel steam condensing device 11 by the steam suction pipe 13 and is cooled by the water in the containment vessel steam condensing device pool 12 to become condensed water. Thus, the pressure in the lower dry well 6 is reduced by the containment vessel vapor condensation device 11. Condensed water in the containment vessel vapor condenser 11 is guided to the suppression pool 7 by the condensed water return pipe 15. The steam generated by heating the water in the containment vessel condenser 12 by the heat from the containment vessel condenser 11 is guided to the outside of the reactor building 1 and discharged by a discharge pipe (not shown).

According to the present embodiment, since the steam suction pipe 13 is connected to the inside of the access tunnel 8, the steam in the space of the lower dry well 6 is smoothly passed through the containment vessel steam condensing device 11 without passing through the upper dry well 5. Can be led to. In particular, in an event in which the containment vessel vapor condensing device 11 is assumed to function, the vapor is generated in the lower dry well 6, and the vapor is generated from a position in the lower dry well 6 close to the vapor generation source. By inhaling,
The function of the containment vessel vapor condensation device 11 can be achieved more effectively. Further, in the present embodiment, the containment vessel vapor condensing device pool 12 is located outside the containment vessel 2,
And since it is installed outside the nuclear reactor secondary containment facility 9, the containment vessel vapor condensing device pool 12 can be a radioactive uncontrolled area. For this reason, it is possible to avoid exposure of workers during inspection of the PCV steam condensing device 11, and to clean the steam released to the outside air from the PCV vapor condensing device pool 12 at the time of accident without containing radioactivity. Therefore, higher security can be ensured.

In the present embodiment, the reactor steam condensing device 21 and the pool 22 for the reactor steam condensing device are used.
Is shown, the reactor steam condensing device 2
1 and the containment vessel steam condensing device 11 can be similarly applied to the case where the reactor steam condensing device pool 22 is not installed.

Further, in this embodiment, the present invention is applied to the reactor building that houses the reactor containment vessel 2 in which the upper dry well 5 and the lower dry well 6 communicate with each other through the communication hole. The present invention can also be applied to the reactor building 1 that houses the reactor containment vessel 2 in which the lower dry well 6 is isolated. In this case, the steam suction pipe 1
3 does not pass through the upper dry well 5, even if the steam suction pipe 13 is damaged, the upper dry well 5 and the lower dry well 6 can be kept isolated.

Next, a second embodiment of the reactor building according to the present invention will be described with reference to FIG. The present embodiment is applied to a reactor building 1 that houses a reactor containment vessel 2 in which an upper dry well 5 and a lower dry well 6 are separated from each other. The configuration is such that steam is led to 11. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

Referring to FIG. 2, in the present embodiment, the upper dry well 5 and the lower dry well 6 are separated by the reactor pressure vessel 3 support. In addition, the communication hole of the first embodiment is eliminated, and the upper dry well 5 and the lower dry well 6
Are connected to the suppression pool 7 by dedicated vent pipes (not shown). As described above, in the present embodiment, the space between the upper dry well 5 and the lower dry well 6 is isolated, so that the gas cannot be conducted.

The steam suction pipe 13 connected to the containment vessel steam condensing device 11 is branched on the way, and is connected to the upper dry well 5 by the upper dry well steam suction pipe 13a.
The lower drywell 6 is connected to the lower drywell 6 by the lower drywell steam suction pipe 13b. A stop valve 23a and a stop valve 23b are provided in the upper drywell steam suction pipe 13a and the lower drywell steam suction pipe 13b, respectively.
Is installed.

In the present embodiment configured as above, the stop valve 23a and the stop valve 23b are normally closed. In the event of an accident, when steam is generated in the upper dry well 5, the stop valve 23a is opened to guide the steam generated in the upper dry well 5 to the containment vessel steam condensing device 11, and when steam is generated in the lower dry well 6. Is the stop valve 23a
To guide the vapor generated in the lower dry well 6 to the containment vessel vapor condensing device 11. At this time, when the stop valve 23a is open, the stop valve 23b is closed, and when the stop valve 23b is open, the stop valve 23a is closed. Therefore, the upper dry well 5 and the lower dry well 6 are isolated. Is kept.

According to the present embodiment, since the upper dry well 5 and the lower dry well 6 can be kept isolated from each other and vapor can be sucked from both the upper dry well 5 and the lower dry well 6, Condensation of steam can be performed efficiently while maintaining the function of the containment vessel 2 separating the dry well 5 and the lower dry well 6.

The present embodiment can also be applied to the reactor building 1 that houses the reactor containment vessel 2 in which the upper dry well 5 and the lower dry well 6 communicate with each other through the communication hole. In this case, the stop valve 23a and the stop valve 23b need not be provided.

Next, a third embodiment of the reactor building according to the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In FIG. 3, a reactor steam condenser pool 22 installed above the reactor pressure vessel 3 and a containment vessel condenser condenser pool 12 installed on the outer periphery of the reactor containment vessel 2 are connected by a connecting pipe 24. I have. In the communication pipe 24,
A shut-off device 25 is provided, and usually, the pool 22 for the reactor steam condenser and the pool 1 for the containment vessel steam condenser.
2 is blocked.

The steam generated in the containment vessel steam condenser pool 12 by being heated by the condensation heat of the steam sucked into the containment vessel steam condenser 11 is discharged out of the reactor building 1 through the discharge pipe 26. At this time, the discharge pipe open end 26a outside the reactor building 1 is installed above the reactor water condensing apparatus pool water surface 22a.

In the present embodiment configured as described above, even if the containment vessel vapor condensing device 11 has been operated for a certain period of time or more and the pool 12 for the containment vessel vapor condensed water has become insufficient, Since it is not conceivable that the reactor steam condenser 21 is used simultaneously with the containment vessel steam condenser 11, water remains in the reactor steam condenser pool 22. Therefore, in such a case, in the present embodiment, the shutoff device 25 is opened, and the water in the reactor steam condenser pool 22 is guided to the containment vessel steam condenser pool 12 via the connecting pipe 24, Condensation of the steam by the containment vessel steam condensing device 11 can be continued.

Therefore, according to the present embodiment, since the pool 12 for the containment vessel steam condenser can also use the water source of the pool 22 for the reactor steam condenser,
As compared with the second embodiment or the second embodiment, it is possible to ensure a sufficiently higher safety even if the amount of water stored in the pool 12 for the storage vessel vapor condensing device is small.

On the other hand, in a case where the shutoff device 25 is unexpectedly opened, when the pool 22 for the reactor vapor condensing device is
Water from the containment vessel vapor condensing apparatus pool 12 tends to exit the reactor building 1 through the discharge pipe 26. However, since the discharge pipe open end 26a is located above the water surface of the reactor condenser pool 22, the water flowing into the discharge pipe 26 goes out of the reactor building 1 beyond the discharge pipe open end 26a. There is no such thing.

As described above, according to the present embodiment, even if the shutoff device 25 is accidentally opened, the water in the reactor steam condenser pool 22 does not flow out.
It is possible to strictly prevent the water shortage in the reactor steam condensing device pool 22.

Next, a fourth embodiment of the reactor building according to the present invention will be described with reference to FIG. The same components as those of the third embodiment are denoted by the same reference numerals, and description thereof is omitted. The discharge pipe 26 from the containment vessel condenser condenser pool 12 has an open discharge pipe end 26a below the reactor vapor condensation pool water surface 22a outside the reactor building 1. The pool 12 for the containment vessel vapor condenser is provided with an upper limit water level sensor 27a for detecting the upper limit water level and a lower limit water level sensor 27b for detecting the lower limit water level of the pool 12 for the containment vessel vapor condenser. Lower limit water level sensor 27b
Is installed above the containment vessel steam condensing device 11 and the containment vessel steam condensing device 11 is submerged in water even when the water surface of the containment vessel steam condensing device pool 12 is at the position of the lower limit water level sensor 27b. It is installed as if.

In the present embodiment thus configured, when the upper limit water level sensor 27a detects that the water level of the containment vessel vapor condenser pool 12 has risen above the upper limit water level sensor 27a, the shutoff device is activated. 25 is closed. On the other hand, when it is detected by the lower limit water level sensor 27b that the water level of the storage vessel vapor condensing device pool 12 is lower than the lower limit water level sensor 27b, control is performed to open the shutoff device 25.

According to the present embodiment, the shutoff device 25 is controlled such that the water level of the containment vessel condenser 12 is always between the upper limit water level sensor 27a and the lower limit water level sensor 27b. Even when the end 26a is below the reactor water condensing device pool water surface 22a, water in the reactor steam condensing pool 22 does not flow out. Further, since the containment vessel vapor condenser 11 is always submerged, the containment vessel vapor condenser 11 can be kept in a state where it can always be operated.

The upper limit water level sensor 27 of this embodiment
Although a is installed in the pool 12 for the containment vessel vapor condenser, it may be installed in the discharge pipe 26 below the discharge pipe open end 26a. Further, instead of the upper limit water level sensor 27a and the lower limit water level sensor 27b, the upper limit water level and the lower limit water level are detected by using a water level meter capable of continuously or intermittently measuring the water level of the containment vessel steam condenser pool 12. The control of the shutoff device 25 may be performed by using the control device.

Alternatively, the cutoff device 25 may be controlled by detecting only the upper limit water level using the upper limit water level sensor 7a or a water level meter capable of measuring continuously or intermittently.

The control based on the lower limit water level in this embodiment or the control based on the upper limit and lower limit water levels in the present embodiment may be applied to the shutoff device 25 in the third embodiment.

Next, a fifth embodiment of the reactor building according to the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Instead of connecting the steam suction pipe 13 connected to the containment vessel steam condenser 11 to the access tunnel, the inside of the suppression pool 7 is installed so as to be buried in the suppression pool 7 water, and is connected to the lower dry well 6.

In the present embodiment configured as described above, the steam generated in the lower dry well 6 is guided to the containment vessel condensation unit 11 by the steam suction pipe 13 and condensed, as in the first embodiment. be able to. At this time, since the steam suction pipe 13 passes through the water in the suppression pool 7, it is also cooled by the water in the suppression pool 7.

Even if the steam suction pipe 13 breaks in the suppression pool 7, the steam guided to the steam suction pipe 13 does not
Released into the water inside and condensed. Therefore, it is possible to prevent the lower drywell 6 from communicating with the gas phase of the suppression pool 7 and prevent the occurrence of an event in which the pressure of the suppression pool 7 increases, and to maintain the function of the suppression pool 7 strictly. According to the present embodiment, even when the steam suction pipe 13 is broken, the lower dry well 6 and the gas space of the suppression pool 7 do not communicate with each other, so that the function of the suppression pool 7 can be strictly maintained.

This embodiment can be applied to each of the second to fourth embodiments.

[0064]

As described in detail above, according to the reactor building of the present invention, the steam generated in the lower dry well can be guided to the containment vessel vapor condenser without passing through the upper dry well. The steam generated during an accident can be efficiently drawn in and condensed. Therefore, the safety of the reactor building can be kept higher.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a reactor building according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a reactor building according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a reactor building according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a reactor building according to a fourth embodiment of the present invention.

FIG. 5 is a sectional view of a reactor building according to a fifth embodiment of the present invention.

FIG. 6 is a cross-sectional view of a reactor building according to the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Reactor building 2 ... Reactor containment vessel 3 ... Reactor pressure vessel 4 ... Main steam piping 5 ... Upper dry well 6 ... Lower dry well 7 ... Suppression pool 8 ... Access tunnel 9 ... Reactor secondary containment facility 11 ... Containment vessel steam condenser 12 ... Containment vessel steam condenser pool 13 ... Steam suction pipe 15 ... Condensed water return pipe 20 ... Condensed water return pipe 21 ... Reactor steam condenser 22 ... Reactor steam condenser pool 22a ... Reactor Pool water surface for steam condenser 23a, 2
3b ... stop valve 24 ... connecting pipe 25 ... shutoff device 26 ... discharge pipe 26a ... discharge pipe open end 27a ... upper limit water level sensor 27b ... lower limit water level sensor

Claims (10)

[Claims] 1. A reactor pressure vessel containing a reactor core, a reactor containment vessel containing the reactor pressure vessel, an upper dry well on an outer periphery of the reactor pressure vessel, and a lower dry well below the reactor pressure vessel. A well, a suppression pool on the outer periphery of the lower dry well for storing water therein, an access tunnel communicating the outside of the reactor containment with the lower dry well, and a steam generated in the reactor containment. In a reactor building comprising a containment vessel vapor condenser for condensing, and a containment vessel condenser condenser pool for storing water therein and submerging and containing the containment vessel condenser, the access tunnel and the containment vessel are provided. A reactor building having a steam suction pipe connected to a steam condenser. 2. A reactor pressure vessel containing a reactor core, a reactor containment vessel containing the reactor pressure vessel, an upper drywell on an outer periphery of the reactor pressure vessel, and a lower drywell below the reactor pressure vessel. And a suppression pool which is located on the outer periphery of the lower dry well and stores water therein,
An atomic reactor comprising: a containment vessel condenser for condensing steam generated in the reactor containment vessel; and a containment vessel condenser condenser pool for storing water therein and submerging and containing the containment vessel condenser. In the furnace building, a steam suction pipe is provided, which is provided so as to be buried in the water stored in the suppression pool and penetrates the suppression pool and connects the lower drywell and the containment vessel steam condenser. Reactor building. 3. The reactor building according to claim 1, wherein the containment vessel vapor condenser pool is provided around the containment vessel. 4. A reactor secondary containment facility which is installed surrounding the reactor containment and serves as a radiation control area, and wherein a pool for the containment vessel vapor condensing device is provided outside the reactor secondary containment facility. 2. An installation according to claim 1,
Or a reactor building according to claim 2. 5. A vapor suction pipe for an upper dry well, which connects the upper dry well and the containment vessel vapor condensing device, is provided.
Reactor building according to any of the above. 6. A stop valve provided in the steam suction pipe connecting the lower drywell and the containment vessel vapor condenser, and a stop valve provided in the upper drywell steam suction pipe. The reactor building according to claim 5, wherein: 7. A reactor steam condensing device for condensing steam in the reactor pressure vessel to reduce the pressure, and a reactor steam condensing device for submerging and storing the reactor steam condensing device in water stored therein. A pool for connecting the reactor steam condenser pool and the containment condenser pool, and a shut-off device provided in the connection pipe. Item 6. A reactor building according to any one of Items 6. 8. A discharge pipe having an open end at a position higher than a surface of water stored in the reactor steam condenser pool and discharging steam generated in the containment vessel steam condenser pool outside the reactor building. The reactor building according to claim 7, further comprising: 9. The reactor building according to claim 7, wherein opening and closing of the shutoff device is controlled based on a water level of a pool for a containment vessel vapor condenser. 10. The reactor building according to claim 1, further comprising means for isolating the upper dry well and the lower dry well.