JP2000292578A - Steam-condensing device in storage container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam-condensing device in a storage container for coping with increase in output without increasing the dimensions of a reactor storage container by improving the arrangement, shape, configuration, or the like of a quencher. SOLUTION: In a steam-condensing device in a storage container with an exhaust pipe 8 that is connected to a safety relief valve provided at the main steam pipe of a boiling-water nuclear reactor, and a quencher 2 for blowing steam provided at the tip of the exhaust pipe 8 and arranged in a suppression pool 3 of a nuclear reactor storage container 1, the tip side of the exhaust pipe 8 is branched into a plurality of portions, and at the same time the quencher is connected to the tip of a branch pipe, thus installing a plurality of quenchers for each safety valve 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam condensing device provided in a containment vessel of a boiling water reactor.

[0002]

2. Description of the Related Art An improved BWR (ABWR) is known as a latest boiling water reactor (BWR). This ABWR reinforced concrete containment vessel (RC
CV) has a safety relief valve (SR
A vapor condenser for condensing the vapor released from V) is provided. FIG. 31 is a schematic plan view of a suppression pool level of a general ABWR RCCV (hereinafter referred to as a “reactor containment vessel”) for explaining the steam condensing apparatus. FIG. It is an expanded sectional view along.

As shown in FIGS. 31 and 32, a plurality of steam condensers are generally provided at the bottom of a suppression pool 3 surrounded by an outer wall 1a of a reactor containment vessel 1 and a reactor pressure vessel base (RPV pedestal) 5. The quencher 2 is connected to a relief safety valve (SRV) (not shown) installed in the upper dry well 7 via an exhaust pipe 8.

The exhaust pipe 8 is introduced from the upper dry well 7 through the diaphragm floor 9 into the suppression pool 3 and connected to the quencher 2. The quencher 2 is, for example, as shown in the drawing, provided with a steam discharge hole in a tube having a cross shape in a plan view so that steam can be ejected outward. The quencher 2 is installed at a position separated from the vent pipe 6 because it is desirable to avoid the area immediately before the vent pipe 6 provided in the RPV pedestal 5 and not to be affected by the steam discharged from the vent pipe 6. are doing. That is, as shown in FIG. 31, for example, the quencher 2 in the portion without the vent pipe 6 is the RPV pedestal 5.
However, the quencher 2 located in the vent pipe 6 has a staggered relative arrangement.

[0005]

In recent years, the output of nuclear power plants has been increased, for example, from 1300 MWe to 1700.
There is a demand for an increase in output to the MWe class. In this case, ABW
At R, the number of relief safety valves increases in response to an increase in output. If the number of quenchers increases in response to the increase in the number of relief safety valves, all quenchers cannot be arranged in the conventional suppression pool, resulting in an expansion of the reactor containment vessel. The expansion of the containment vessel leads to an increase in the size of the reactor building, which increases the plant cost.

[0006] The present invention has been made in view of such circumstances, and by improving the arrangement, shape, configuration, and the like of the quencher, the steam inside the containment vessel can respond to an increase in power without increasing the size of the containment vessel. It is an object to provide a condenser.

[0007]

To achieve the above object, according to the first aspect of the present invention, an exhaust pipe connected to a relief safety valve provided in a main steam pipe of a boiling water reactor, and the exhaust pipe In the containment vessel steam condensing device provided with a plurality of quenchers for steam blowing arranged in the suppression pool of the reactor containment vessel, the tip side of the exhaust pipe is branched into a plurality, A quencher is connected to each end of the branch pipe to provide a plurality of quenchers for one of the safety valves.

According to a second aspect of the present invention, there is provided the vapor condensation apparatus in the containment vessel according to the first aspect, wherein a branch point of the exhaust pipe is set in an upper dry well of the containment vessel. Provide equipment.

According to a third aspect of the present invention, there is provided an in-container vapor condensing apparatus according to the first aspect, wherein a branch point of the exhaust pipe is set in an air portion of the suppression pool. I do.

According to a fourth aspect of the present invention, there is provided a vapor condensing apparatus in a containment vessel according to the first aspect, wherein a branch point of the exhaust pipe is set in a submerged portion of the suppression pool. I do.

[0011] In the invention according to claim 5, an exhaust pipe connected to a relief safety valve provided in a main steam pipe of the boiling water reactor,
In the containment vessel vapor condensing device provided at the tip of the exhaust pipe and having a plurality of quenchers for steam blowing arranged in the suppression pool of the reactor containment vessel,
The exhaust pipe is guided below a substantially horizontal communication tunnel penetrating the suppression pool, and a quencher is also provided below the tunnel.

It is more preferable that the configuration of the exhaust pipe and the quencher according to any one of claims 1 to 4 be applied to the in-container vapor condensation apparatus according to claim 5.

According to a sixth aspect of the present invention, in the vapor condensing device in the containment vessel according to the fifth aspect, below the communication tunnel,
Provided is a vapor condensation apparatus in a containment vessel, wherein a support for fixedly supporting an exhaust pipe is provided.

According to a seventh aspect of the present invention, in the vapor condensing apparatus in the containment vessel according to the sixth aspect, the support for supporting the exhaust pipe is attached to a lower part of the communication tunnel or is installed at a bottom of the suppression pool. The present invention provides an in-container-in-container vapor condensation device characterized by the following.

In the invention according to claim 8, an exhaust pipe connected to a relief safety valve provided in a main steam pipe of the boiling water reactor,
In the containment vessel vapor condensing device provided at the tip of the exhaust pipe and having a plurality of quenchers for steam blowing arranged in the suppression pool of the reactor containment vessel,
The reactor power is set to 1700 MWe class, and correspondingly, a large-capacity safety valve and a large-capacity quencher are installed in a one-to-one relationship at 11 or more and 14 or less, and the large-capacity quencher is installed in the suppression pool. Provided is a vapor condensing device in a storage container, which is arranged in a line on the same circumference.

According to a ninth aspect of the present invention, in the vapor condensation apparatus in a containment vessel according to the eighth aspect, at least one of the quenchers is disposed below a substantially horizontal communication tunnel passing through the suppression pool. Provided is a vapor condensation device in a containment vessel.

According to the tenth aspect, in the eighth aspect or the ninth aspect,
In the above-mentioned inside-container vapor condensation apparatus, there is provided a inside-container vapor condensation apparatus characterized in that a support for fixedly supporting an exhaust pipe is provided below a communication tunnel.

In the eleventh aspect of the present invention, the support for supporting the exhaust pipe is attached to a lower portion of the communication tunnel or installed at the bottom of the suppression pool. The present invention provides an in-container-in-container vapor condensation device characterized by the following.

According to a twelfth aspect of the present invention, an exhaust pipe connected to a relief safety valve provided in a main steam pipe of a boiling water reactor, and an exhaust pipe provided at a tip of the exhaust pipe and provided in a suppression pool of a containment vessel. And a plurality of quenchers for steam blowout provided in the storage container, wherein the quencher is constituted by an annular header installed below the suppression pool.
One or more of the exhaust pipes are connected to provide an in-container vapor condensation apparatus.

According to the thirteenth aspect of the present invention, an exhaust pipe connected to a relief safety valve provided in a main steam pipe of a boiling water reactor, and an exhaust pipe provided at a tip of the exhaust pipe and provided in a suppression pool of a containment vessel. And a plurality of quenchers for steam blowout arranged in the storage vessel, wherein the quencher is exhausted by providing a steam discharge hole at a portion of the exhaust pipe inserted into the suppression pool at the distal end side. Provided is a vapor condensing device in a containment vessel, wherein the condensing device has an integrated structure as a part of a pipe.

According to the fourteenth aspect, the first to thirteenth aspects are described.
The storage condenser according to any one of the above, wherein the exhaust pipe is buried in a vertical wall of the concrete containment vessel or penetrated through the lateral wall to lead to the suppression pool. An in-vessel vapor condenser is provided.

According to a fifteenth aspect of the present invention, in the vapor condensing unit in the containment vessel according to the fourteenth aspect, the vertical wall of the reactor containment vessel in which the exhaust pipe is buried is at least one of an outer wall and an RPV pedestal. The present invention provides an in-container-in-container vapor condensation device characterized by the following.

According to a sixteenth aspect of the present invention, there is provided the in-container vapor condensing apparatus according to the fourteenth aspect, wherein the lateral wall through which the exhaust pipe passes is a diaphragm floor.

According to the seventeenth aspect, in the twelfth aspect,
6. A vapor condensing device in a containment vessel according to any one of the items up to 6, wherein the header has a circular or square tubular shape.

According to an eighteenth aspect of the present invention, in the vapor condensing apparatus for a containment container according to the seventeenth aspect, the header is supported from below by a support base provided at the bottom of the suppression pool. I will provide a.

According to the nineteenth aspect, the exhaust pipe connected to the relief safety valve provided in the main steam pipe of the boiling water reactor, and the exhaust pipe provided at the tip of the exhaust pipe and located in the suppression pool of the containment vessel. And a plurality of quenchers for steam blowout disposed in the containment vessel, wherein the exhaust pipe is buried in a vertical wall of a concrete reactor containment vessel or penetrated through a lateral wall and led to a suppression pool. A steam condensing device in a containment container, wherein a steam jet nozzle is provided at an outlet of the exhaust pipe to the suppression pool, and the nozzle is used as a quencher.

According to the twentieth aspect, an exhaust pipe connected to a relief safety valve provided in a main steam pipe of a boiling water reactor, and an exhaust pipe provided at a tip of the exhaust pipe and provided in a suppression pool of a reactor containment vessel. And a plurality of quenchers for discharging steam disposed in the storage container.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vapor condensing device in a containment vessel according to the present invention will be described below with reference to FIGS.

First Embodiment (FIGS. 1 to 6) A first embodiment of the present invention, which is a schematic plan view of a suppression pool level of a reactor containment vessel (RCCV) in an ABWR, is shown in FIG. FIG. 2 is an enlarged sectional view taken along line BB of FIG. 1.

In this embodiment, although not shown, 1
Exhaust pipes 8 are respectively connected to large relief safety valves provided on a main steam pipe connected to a 700 MWe-class reactor pressure vessel, and the exhaust pipes 8 hang down in the upper dry well 7. It branches into two or more branch pipes 8a on the diaphragm floor 9. Each branch pipe 8 of this exhaust pipe 8
a penetrates through the diaphragm floor 9, and the distal ends (lower ends) of the branch pipes 8a are respectively disposed near the inner bottom of the suppression pool 3, and the quenchers 2 are connected to the distal ends of the respective branch pipes 8a. Each quencher 2 is a flat cross-shaped tube, and has the same shape and the same size as those used in the conventional 1300 MWe class.

The RPV pedestal 5 is provided with a vent pipe 6 for introducing a gas pressure generated in an emergency from the dry well side into the suppression pool 3.

According to such a configuration, each exhaust pipe 8 has one
Compared to the conventional apparatus configuration in which one quencher 2 is connected correspondingly, a plurality of quenchers 2
Is connected, and a larger amount of steam can be discharged into the water of the suppression pool 3, so that the amount of steam release can be increased.

Therefore, the applicable plant is 1700 MW
In the case of the e-class and large output, according to the present embodiment, even when the relief safety valve is large and the amount of steam discharged to the exhaust pipe 8 increases, according to the present embodiment, the quencher 2 through one exhaust pipe 8 is used. Quencher 2 itself can be dealt with without increasing the size of quencher 2 itself. And according to the calculation result, the conventional 1
The number of quenchers 2 can be increased with respect to the size of the 300 MWe suppression pool 3, and sufficient vapor absorption can be achieved.

Therefore, according to the present embodiment, it is possible to cope with an increase in output without having to expand the suppression pool 3 and thus the reactor containment vessel 1.

In this embodiment, since the length of the branch pipe 8a extending from the exhaust pipe 8 to the quencher 2 after branching is long, the pressure of the discharged steam tends to be uniform in each pipe. , The performance of the quencher 2 is preferable.

FIGS. 3 and 4 show modifications of the present embodiment, and the drawings correspond to FIGS. 1 and 2, respectively.

In the examples of FIGS. 3 and 4, the branch point of the exhaust pipe 8 is provided in the aerial part of the suppression pool 3. According to the present embodiment, the downstream side after branching of the exhaust pipe 8 can be shortened as compared with the configuration shown in FIGS. 1 and 2, and the through portion of the diaphragm floor 9 becomes one for each relief safety valve, so that the exhaust The amount of the pipe 8 and the amount of the through-hole of the diaphragm floor 9 can be reduced as compared with the configurations shown in FIGS. 1 and 2.

FIGS. 5 and 6 show another modification of the present embodiment, and the drawings respectively correspond to FIGS. 1 and 2, respectively.

In the examples shown in FIGS. 5 and 6, the branch point of the exhaust pipe 8 is set in the underwater part of the suppression pool 3. According to this example, the downstream side of the exhaust pipe 8 after branching,
That is, the length of the branch pipe 8a is the shortest as compared with the examples of FIGS. In addition, as in the example of FIG.
In this case, the amount of the exhaust pipe 8 is the smallest, and the amount of the through-hole of the diaphragm floor 9 is also the smallest.

Second Embodiment (FIGS. 7 to 10) FIG. 7 is a schematic plan view showing a second embodiment of the present invention.
FIG. 8 is an enlarged sectional view taken along line CC of FIG.

In this embodiment, as shown in FIGS. 7 and 8, the exhaust pipe 8 is guided below a substantially horizontal connecting tunnel 4 penetrating the suppression pool 3, and the quencher 2 is also provided below the connecting tunnel 4. It is arranged.

That is, a conventional 1300 MWe class ABWR
Since the required number of quenchers was not large in the PCV, no quenchers were arranged below the communication tunnel in the suppression pool. In the present embodiment, a quencher is also arranged below the tunnel,
This corresponds to an increase in plant output of the 00 MWe class.

More specifically, as shown in FIGS. 7 and 8, the outer wall 1a of the containment vessel 1 and the RPV pedestal 5
The quenchers 2 are arranged in the suppression pool 3 surrounded by the quencher 2 for access of workers, equipment loading / unloading, wiring insertion, and the like.

After the exhaust pipe 8 from the relief safety valve passes through the diaphragm floor 9, it branches in the suppression pool 3, branches into two or more exhaust pipes (branch pipes 8 a), and further below the connecting tunnel 4. It is bypassing to. In this state, each branch pipe 8a is connected to two or more quenchers 2 disposed below the tunnel in the suppression pool 3.

In this embodiment, the suppression pool 3
In order to stabilize the connection to the quencher 2 disposed below the communication tunnel 4 in the inside, a pipe support 10 for supporting the exhaust pipe 8 is provided below the communication tunnel 4, whereby the exhaust pipe 8 is connected to the communication tunnel 4. It is fixed and held at the bottom of. In addition, since the pipe reaction force acts on the communication tunnel 4, the configuration is such that the strength required for the communication tunnel 4 is secured.

According to the configuration of the present embodiment, by disposing the quencher 2 also in the space below the communication tunnel 4, it is possible to discharge a larger amount of steam by increasing the number of the quencher.

FIGS. 9 and 10 show modified examples of the present embodiment, and the drawings correspond to FIGS. 7 and 8, respectively.

The configuration shown in FIGS. 9 and 10 applies the support reaction force when the quencher 2 is arranged below the communication tunnel 4 directly to the wall of the reactor containment vessel 1, the base mat of the reactor building, and the like. It is to be transmitted. That is, a table-like support base 11 is provided at the bottom of the suppression pool 3.
The pipe support 10 for holding the exhaust pipe 8 is fixed to the lower surface of the top plate portion of the support base 11.

According to such a configuration, the reaction force of the pipe support 10 is directly applied to the reactor containment vessel 1 by installing a support structure dedicated to supporting the exhaust pipe 8 below the tunnel.
Alternatively, it can be transmitted to the structural members of the reactor building, stabilizing the support, and simplifying the structure.

Third Embodiment (FIGS. 11 to 14) FIG. 11 is a schematic configuration diagram showing a third embodiment of the present invention, and FIG. 12 is an enlarged sectional view taken along line DD of FIG.

In the present embodiment, when a large-capacity quencher corresponding to a large-capacity relief safety valve is applied, the large-sized quencher can be arranged in the suppression pool without causing the expansion of the reactor containment vessel. It was made.

That is, in this embodiment, the reactor power is reduced to 17
00MWe class, and correspondingly, 11 or more large-capacity safety valves and large-capacity quenchers 2 in a one-to-one relationship
Four or less quenchers 2 are installed, and large-capacity quenchers 2 are arranged in a line on the same circumference in the suppression pool 3.

The configuration in which the exhaust pipe 8 from the relief safety valve penetrates the diaphragm floor 9 and is connected to the large quencher 2 in the suppression pool 3 is the same as in each of the above embodiments.

According to the structure of this embodiment, the development of the large quencher 2 requires cost, but the exhaust pipe 8 is provided one for each relief safety valve, and the penetration part of the diaphragm floor 9 is also minimized. 13
A storage container size of the order of 00 MWe can be applied, and the number of quenchers 2 is greatly reduced as compared with the conventional one, so that installation costs and the like can be reduced.

FIGS. 13 and 14 show modified examples of the present embodiment, and the figures correspond to FIGS. 11 and 12, respectively.

In the configuration of this modified example, the exhaust pipe 8 from the relief safety valve passes through the diaphragm floor 9 and then bypasses below the communication tunnel 4 as in the case of FIG. In this state, it is connected to the quencher 2 disposed below the tunnel in the suppression pool 3.

In this configuration example, the suppression pool 3
In order to stabilize the connection to the quencher 2 disposed below the communication tunnel 4 in the inside, a pipe support 10 for supporting the exhaust pipe 8 is provided below the communication tunnel 4, whereby the exhaust pipe 8 is connected to the communication tunnel 4. It is fixed and held at the bottom of. In addition, since the pipe reaction force acts on the communication tunnel 4, the configuration is such that the strength required for the communication tunnel 4 is secured.

According to such a configuration, it is possible to effectively cope with a case where the number of safety valves is large.

Fourth Embodiment (FIGS. 15 and 16) FIG. 15 is a schematic structural view showing a fourth embodiment of the present invention, and FIG. 16 is an enlarged sectional view taken along line EE of FIG.

In the present embodiment, the quencher 2 is constituted by an annular header, and one or a plurality of exhaust pipes 8 are connected to this header and installed below the suppression pool 3.

The header serving as the quencher 2 is, for example, a circular tube. A number of holes for discharging steam are formed in the pipe wall, and the header is disposed at the bottom of the suppression pool 3 via a support. Quencher 2 of this header method
In addition, the exhaust pipe 8 from the relief safety valve is
, And are connected in the suppression pool 3.

According to the present embodiment, since the plurality of exhaust pipes 8 are connected to the quencher 2 having a header shape, the mutual quenchers 2 are further equalized, and the quencher 2
It is preferable in exhibiting the performance of the above.

Fifth Embodiment (FIGS. 17 and 18) FIG. 17 is a schematic structural view showing a fifth embodiment of the present invention, and FIG. 18 is an enlarged sectional view taken along line FF of FIG.

In the present embodiment, the quencher 2 is integrated as a part of the exhaust pipe 8 by providing a large number of steam discharge holes at the end of the exhaust pipe 8 inserted into the suppression pool 3. ing. The exhaust pipe 8 from the relief safety valve passes through the diaphragm floor 9 and the RCCV wall 1 and R
It is arranged in a suppression pool 3 surrounded by a PV pedestal 5.

In the present embodiment, there is no independent device as a quencher, and it is necessary to support the tip of the exhaust pipe 8, and the support base 11 provided at the bottom of the suppression pool 3 is required.
A support 10 is attached to the support member 10, and the support 10 supports a pipe reaction force.

According to the present embodiment, the same operation and effect as those of the above embodiments can be obtained, but the number of parts is smaller than that of the above embodiments, and the configuration can be simplified.

[0067]Sixth embodiment (FIGS. 19 to 30) FIGS. 19, 21, 23, 25, 27, and 29 are original
FIG. 17 is a schematic configuration diagram illustrating a configuration example different from the sixth embodiment of the present invention.
20, 22, 24, 26, 28, and 30 respectively
GG line, G in FIGS. 19, 21, 23, 25, 27, 29
₁-G₁Line, G ₂-G₂Line, G₃-G₃Line, G₄-G₄
Line, G₅-G₅It is an expanded sectional view which follows a line.

In the embodiment shown in FIGS. 19 and 20, the exhaust pipe 8 is buried in the outer wall 1 a of the containment vessel 1. The lower end of this exhaust pipe 8 is
Projecting from the outer wall 1a to the suppression pool 3 and connected to the large quencher 2. Other configurations are substantially the same as those of the third embodiment.

According to the present invention, since the exhaust pipe 8 is buried in the outer wall 1a of the containment vessel 1, the number of pipe supports can be greatly reduced, and cost reduction can be effectively achieved.

In the embodiment shown in FIGS. 21 and 22, the exhaust pipe 8 is buried in the RPV pedestal 5 and connected to the large quencher 2. Other structures are substantially the same as those shown in FIGS. 19 and 20.

According to the present embodiment, the RPV pedestal 5
By burying the exhaust pipe 8 in the pipe, the number of pipe supports can be greatly reduced, which is effective for cost reduction.

In the embodiment shown in FIGS. 23 and 24, the exhaust pipe 8 is embedded in the outer wall 1a of the reactor containment vessel 1 or in the RPV pedestal 5 (not shown), and is connected to the quencher 2 by the header method. Other structures are substantially the same as those shown in FIGS.

According to the present embodiment, the piping support can be greatly reduced, and the cost can be reduced.
Equalization of the exhaust pipes 8 can be achieved.

In the embodiment shown in FIGS. 25 and 26, the exhaust pipe 8 is embedded in the outer wall 1a of the reactor containment vessel 1 or the RPV pedestal 5 (not shown) and has a rectangular cross section integrated with the reactor containment liner. Are connected to a quencher 2 by a header consisting of The quencher 2 according to the header method is disposed at the bottom corner of the suppression pool 3, and a number of holes for discharging steam are formed on a surface other than the wall joint.

According to the present embodiment, by integrating the quencher 2 and the reactor containment liner, the quantity of the quencher 2 can be reduced, and the upper dry well 7 and the exhaust pipe 8 in the suppression pool 3 can be reduced. Can be greatly reduced, and cost reduction and equalization of the exhaust pipes 8 can be achieved.

In the embodiment shown in FIGS. 27 and 28, the exhaust pipe 8 is embedded in the outer wall 1a of the reactor containment vessel 1 or the RPV pedestal 5 (not shown), and an outlet nozzle protruding from the tip of the exhaust pipe is provided. It is quencher 2. In the illustrated example, the nozzle has a two-stage configuration.

Then, steam is directly discharged from the quencher 2 composed of the two-stage nozzles to the water in the suppression pool 3.

According to such a configuration, the quencher 2 is formed by the tip nozzle of the exhaust pipe 8 buried in the wall, so that a unique component of the quencher is not required, the physical quantity is reduced, and the upper dry well 7 and The support structure for the exhaust pipe 8 in the suppression pool 3 can be omitted, and a significant cost reduction can be achieved.

In the embodiment shown in FIGS. 29 and 30, among the vent pipes 6 provided in the RPV pedestal 5 of the reactor containment vessel 1, the one that is in communication with the suppression pool 3 receives the backflow from the suppression pool 3. A check valve 12 for blocking is provided.
The exhaust pipe 8 from the relief safety valve merges with the vent pipe 6 located closer to the suppression pool 3 than 2, so that the vent pipe 6 can be used as a part of the exhaust pipe 8.

An opening of the vent pipe 6 which becomes a part of the exhaust pipe 8 to the suppression pool 3 is provided with any one of the above-described embodiments, for example, a nozzle type quencher 2.

According to such a configuration, when the steam flows into the vent pipe 6 from the steam pipe 8, the steam flows backward to the upper dry well 7 by the check valve 12 provided in the opening on the upper dry well side of the vent pipe 6. The discharge steam is guided from the vent pipe 6 to the suppression pool 3 and condenses in water.

According to the present embodiment, by integrating the vent pipe 6 and the exhaust pipe 8, the exhaust pipe 8 and the pipe support can be greatly reduced, and a greater effect can be expected in cost reduction.

[0083]

As described above in detail, according to the reactor containment vessel of the present invention, the electric output can be reduced to the conventional 1300 MW.
When there is a request to increase from e-class to 1700 MWe-class, etc., it is possible to cope with the increase in output without the need to enlarge the size of the containment vessel, and effectively cope with the cost reduction of the nuclear power plant accompanying the increase in output. And the like.

When the capacity of the quencher is not increased by using a large-capacity relief safety valve in response to an increase in output, the exhaust pipe of the relief safety valve is branched and connected to a plurality of conventional-capacity quenchers. By using this method, it is possible to increase the output of the power plant without developing a large-capacity quencher at a great cost.

The conventional quenchers in the containment vessel were not arranged at the lower part of the communication tunnel in the suppression pool due to the small number of quenchers in the containment vessel. It can correspond to the number.

If the shape of the quencher and the connection method are the header method and the exhaust pipe is the wall-embedding method, the cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line BB of FIG. 1;

FIG. 3 is a schematic plan view showing a modification of the first embodiment of the present invention.

FIG. 4 is an enlarged sectional view taken along line B ₁ -B ₁ of FIG. 3;

FIG. 5 is a schematic plan view showing a modification of the second embodiment of the present invention.

FIG. 6 is an enlarged sectional view taken along line B ₂ -B ₂ of FIG. 5;

FIG. 7 is a schematic plan view showing a third embodiment of the present invention.

FIG. 8 is an enlarged sectional view taken along line CC of FIG. 7;

FIG. 9 is a schematic plan view showing a modification of the third embodiment of the present invention.

FIG. 10 is an enlarged sectional view taken along line C ₁ -C ₁ of FIG. 9;

FIG. 11 is a schematic plan view showing a fourth embodiment of the present invention.

FIG. 12 is an enlarged sectional view taken along line DD of FIG. 11;

FIG. 13 is a schematic plan view showing a modification of the fourth embodiment of the present invention.

FIG. 14 is an enlarged sectional view taken along line D ₁ -D ₁ of FIG. 13;

FIG. 15 is a schematic plan view showing a fifth embodiment of the present invention.

FIG. 16 is an enlarged sectional view taken along line EE of FIG. 15;

FIG. 17 is a schematic plan view showing a sixth embodiment of the present invention.

FIG. 18 is an enlarged sectional view taken along line FF of FIG. 17;

FIG. 19 is a schematic plan view showing a seventh embodiment of the present invention.

FIG. 20 is an enlarged sectional view taken along line GG of FIG. 18;

FIG. 21 is a schematic plan view showing a first modification of the seventh embodiment of the present invention.

FIG. 22 is an enlarged sectional view taken along line G ₁ -G ₁ of FIG. 21;

FIG. 23 is a schematic plan view showing a second modification of the seventh embodiment of the present invention.

[24] _G 2 -G ₂ line enlarged cross section of FIG. 23.

FIG. 25 is a schematic plan view showing a third modification of the seventh embodiment of the present invention.

[26] _G 3 -G ₃ line enlarged cross section of FIG. 25.

FIG. 27 is a schematic plan view showing a fourth modification of the seventh embodiment of the present invention.

[Figure 28] _G 4 -G ₄ line enlarged cross section of FIG. 27.

FIG. 29 is a schematic plan view showing a fifth modification of the seventh embodiment of the present invention.

[Figure 30] _G 5 -G ₅ line enlarged cross section of FIG. 29.

FIG. 31 is a schematic plan view showing a conventional vapor condensation arrangement in a storage container of an ABWR.

FIG. 32 is a schematic cross-sectional view showing a conventional steam condensation arrangement in a storage container of an ABWR.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reactor containment vessel 1a Outer wall 2 Quencher 3 Suppression pool 4 Communication tunnel 5 Reactor base (RPV pedestal) 6 Vent pipe 7 Upper drywell 8 Exhaust pipe 8a Branch pipe 9 Diaphragm floor 10 Piping support 11 Support base 12 Check valve

Claims (20)

[Claims] An exhaust pipe connected to a relief safety valve provided in a main steam pipe of a boiling water reactor, and steam provided at a tip of the exhaust pipe and disposed in a suppression pool of a containment vessel. In a vapor condensing device in a containment vessel provided with a quencher for blowing, a tip side of the exhaust pipe is branched into a plurality of pieces, and a quencher is connected to a tip of the branch pipe, respectively, so that one safety valve is provided. An in-container vapor condensing device comprising a plurality of quenchers. 2. The vapor condensing device in a containment vessel according to claim 1, wherein a branch point of the exhaust pipe is set in an upper dry well of the containment vessel. 3. The in-container vapor condensing device according to claim 1, wherein a branch point of the exhaust pipe is set in the air portion of the suppression pool. 4. The vapor condensation apparatus in a containment vessel according to claim 1, wherein a branch point of the exhaust pipe is set at an underwater portion of the suppression pool. 5. An exhaust pipe connected to a relief safety valve provided in a main steam pipe of a boiling water reactor, and steam provided at a tip of the exhaust pipe and disposed in a suppression pool of a reactor containment vessel. In a vapor condensation apparatus in a containment vessel having a quencher for blowing, the exhaust pipe is guided below a substantially horizontal communication tunnel penetrating the suppression pool, and a quencher is also arranged below the tunnel. Steam condensing device inside the containment vessel. 6. The in-container vapor condensing device according to claim 5, wherein a support for fixedly supporting the exhaust pipe is provided below the communication tunnel. 7. A storage condenser according to claim 6, wherein the support for supporting the exhaust pipe is attached to a lower portion of the communication tunnel or is installed at a bottom of the suppression pool. In-vessel vapor condenser. 8. An exhaust pipe connected to a relief safety valve provided in a main steam pipe of a boiling water reactor, and steam provided at a tip of the exhaust pipe and disposed in a suppression pool of a containment vessel. In a steam condensing unit in a containment vessel provided with a quencher for blowing out, a reactor output is set to 1700 MW.
In accordance with this, 11 to 14 large-capacity safety valves and large-capacity quenchers are installed in a one-to-one relationship, and the large-capacity quenchers are placed on the same circumference in the suppression pool. A vapor condensing device in a containment vessel, wherein the vapor condensing device is arranged in a row. 9. The vapor condensation apparatus in a containment vessel according to claim 8, wherein at least one of the quenchers is disposed below a substantially horizontal communication tunnel penetrating the suppression pool. apparatus. 10. The in-container vapor condensing device according to claim 8, wherein a support for fixedly supporting the exhaust pipe is provided below the communication tunnel. 11. A storage apparatus according to claim 10, wherein the support for supporting the exhaust pipe is attached to a lower part of the communication tunnel or is installed at a bottom of the suppression pool. In-vessel vapor condenser. 12. An exhaust pipe connected to a relief safety valve provided in a main steam pipe of a boiling water reactor, and steam provided at a tip of the exhaust pipe and disposed in a suppression pool of a containment vessel. In a vapor condensation apparatus in a containment vessel provided with a quencher for blowing, the quencher is constituted by an annular header installed below the suppression pool, and one or more of the exhaust pipes are connected to the header. A steam condensing device in a containment vessel. 13. An exhaust pipe connected to a relief safety valve provided in a main steam pipe of a boiling water reactor, and steam provided at a tip of the exhaust pipe and disposed in a suppression pool of a containment vessel. In a vapor condensing device in a containment vessel provided with a quencher for blowing, a quencher is integrated as a part of the exhaust pipe by providing a vapor discharge hole at a portion of the exhaust pipe inserted into a suppression pool at a tip end side of the exhaust pipe. A steam condensing device in a containment vessel, characterized in that it has a configuration as described above. 14. The steam condenser in a containment vessel according to any one of claims 1 to 13, wherein the exhaust pipe is buried in a vertical wall of the concrete reactor containment vessel or penetrated through a lateral wall to form a suppression pool. A vapor condensing device in a storage container, wherein the vapor condensing device is configured to be guided. 15. The containment vapor condensing device according to claim 14, wherein the vertical wall of the reactor containment vessel in which the exhaust pipe is buried is at least one of an outer wall and an RPV pedestal. In-vessel vapor condenser. 16. The in-container vapor condensing device according to claim 14, wherein the lateral wall through which the exhaust pipe passes is a diaphragm floor. 17. The in-container vapor condensing device according to claim 12, wherein the header is a circular tube or a square tube. 18. The vapor condensing device in a containment vessel according to claim 17, wherein the header is supported from below by a support base installed at the bottom of the suppression pool. 19. An exhaust pipe connected to a relief safety valve provided in a main steam pipe of a boiling water reactor, and steam provided at a tip of the exhaust pipe and disposed in a suppression pool of a containment vessel. A vapor condensing unit in a containment vessel having a quencher for blowing, wherein the exhaust pipe is buried in a vertical wall of a concrete reactor containment vessel, or penetrates a horizontal wall, and is guided to a suppression pool, and the exhaust pipe A steam condensing device in a containment vessel, wherein a nozzle for jetting steam is provided at an outlet to the suppression pool, and the nozzle is used as a quencher. 20. An exhaust pipe connected to a relief safety valve provided in a main steam pipe of a boiling water reactor, and steam provided at a tip of the exhaust pipe and arranged in a suppression pool of a reactor containment vessel. In a vapor condensing device in a containment vessel provided with a quencher for blowing, a check valve for preventing a backflow from the suppression pool side is provided in a vent pipe provided in the reactor containment vessel, the vent pipe communicating with the suppression pool. The exhaust pipe from the relief safety valve is merged with the vent pipe located closer to the suppression pool than the check valve, whereby the vent pipe is applied as a part of the exhaust pipe. The quencher according to any one of claims 1 to 19, wherein an opening of the vent pipe, which becomes a part, to the suppression pool is provided. A steam condensing device in a containment vessel, which is characterized in that the steam condensing device is provided.