JP2000346973A - Reactor containment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an isolation means with high sealing capability in a reactor power plant, isolating a containment gas-tightly an upper drywell and a lower drywell and suppression chamber. SOLUTION: The reactor containment 1 having a structure isolating an upper drywell 9 surrounding a reactor pressure vessel 4 of a boiling water reactor and a lower drywell 10 by the junction between RPV pedestal 2 placed around the reactor pressure vessel 4 and an RPV skirt 3 projecting from the lower end of the reactor containment, is provided with a freely extendable joint covering the connection part between the RPV pedestal 2 and the RPV skirt 3 as a means isolating gas-tightly between the RPV pedestal 2 and the RPV skirt 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reactor containment vessel having a structure in which an upper drywell and a lower drywell are separated in a boiling water reactor, and more particularly to a reactor containment vessel for an RPV pedestal which supports a reactor pressure vessel. The present invention relates to a technique for improving hermetic sealing.

[0002]

2. Description of the Related Art An advanced boiling water reactor (ABWR) is known as the latest boiling water reactor (BWR).

The ABWR reinforced concrete reactor containment vessel (RCCV) is provided with a reactor pressure vessel supported by a support skirt (RPV skirt) by a substantially hollow cylindrical RPV pedestal in the center of the interior.
The outer peripheral side of the reactor pressure vessel is surrounded by a hollow cylindrical outer peripheral concrete wall. The outer concrete wall and the RPV pedestal are supported at their lower ends by mat concrete. Perimeter concrete wall and RP
The V pedestal is connected to the RPV pedestal by a horizontal floor at substantially the center in the vertical direction.

[0004] Above the supporting skirt portion of the reactor pressure vessel, it is surrounded by an outer dry well which is a space surrounded by an outer concrete wall, a horizontal floor, and an RPV pedestal. Further, the lower side from the support skirt portion of the reactor pressure vessel is surrounded by mat concrete and a lower dry well which is a space surrounded by the RPV pedestal. The lower drywell contains a sump and reactor coolant recirculation pump and a control rod drive mechanism.

Further, on the outer peripheral side of the lower dry well,
An outer concrete wall, matte concrete, a horizontal floor, and a wet well, which is a space surrounded by a PRV pedestal, are provided. In the lower half of the wet well, a suppression pool storing water is provided.

When there is a demand for an increase in the electric power of the conventional containment vessel configured as described above, an increase in the core fuel, an increase in the free space volume of the upper dry well, the lower dry well, and the wet well, With an increase in the amount of water secured in the suppression pool, the inner diameter and height of the containment vessel increase.

In view of such circumstances, the applicant of the present invention has proposed a reactor containment vessel which is reduced in size safely and relatively easily in response to an increase in electric output, and which has improved economic efficiency. (For example, Japanese Patent Application No. 10-8741)
No. 1).

In this proposal, an upper dry well and a lower dry well surrounding a reactor containment vessel are spatially separated.

That is, in this proposal, isolation means for hermetically isolating the upper dry well and the lower dry well at the position where the reactor pressure vessel is supported, and a vent dedicated to the upper dry well communicating the upper dry well and the suppression pool. A pipe, a vent pipe dedicated to the upper dry well, and a communication hole that communicates with the gas phase of the wet well are released. And a high-pressure gas inflow means dedicated to the upper dry well for selectively allowing air flow from the upper dry well to the upper dry well.

A vent pipe dedicated to the lower drywell communicating the lower drywell with the suppression pool, and a communication hole communicating the gas phase portion of the lower drywell and the wet well are provided in a communication hole, and are provided at a certain level in an emergency. And a high-pressure gas inflow means dedicated to the lower dry well for releasing the shielded state by the atmospheric pressure and selectively allowing the gas flow from the gas phase portion of the wet well to the lower dry well.

In such a reactor containment vessel, it is necessary to isolate the upper dry well and the lower dry well in a reliable airtight state.

[0012]

However, in the above-mentioned reactor containment for hermetically isolating the upper dry well and the lower dry well, the RPV skirt and the RP
Although it has been shown that the junction of the V pedestal is isolated, an isolation structure for providing an airtight isolation and an isolation means having an isolation function have not been embodied yet.

The present invention has been made in view of such circumstances, and has as its object to provide a reactor containment vessel for hermetically isolating an upper drywell, a lower drywell, and a suppression chamber in a nuclear power plant. Accordingly, it is an object of the present invention to specifically provide an isolation means having a high sealing property.

[0014]

In order to solve the above-mentioned problems, an invention according to claim 1 includes an upper dry well and a lower dry well surrounding a reactor pressure vessel of a boiling water reactor, which are provided with a reactor. An RPV pedestal installed on the outer periphery of the pressure vessel and an RP protruding from the lower end of the containment vessel
A reactor containment vessel having a structure to be isolated from each other by a joint portion with a V skirt, as means for hermetically isolating between the RPV pedestal and the RPV skirt,
A reactor containment vessel is provided, which is provided with a joint that is capable of covering a joint between the RPV pedestal and the RPV skirt and that is capable of expanding and contracting.

According to a second aspect of the present invention, in the containment vessel according to the first aspect, the expansion joint is a bellows that expands and contracts in at least one of a horizontal direction and a vertical direction between the RPV pedestal and the RPV skirt. A reactor containment vessel characterized by having:

According to a third aspect of the present invention, an upper dry well and a lower dry well surrounding a reactor pressure vessel of a boiling water reactor are combined with an RPV installed on the outer peripheral side of the reactor pressure vessel.
A reactor containment vessel having a structure in which a pedestal RPV receiving bracket and a lower end flange of an RPV skirt projecting from a lower end side of the reactor containment vessel are separated from each other by a joint, wherein the RPV pedestal and the RPV skirt are separated from each other. As means for hermetically separating the spaces, the RPV
A concave plate provided on a surface of the base plate on the side of the RPV skirt, the base plate being provided between the receiving bracket and the RPV skirt, and an RPV base bolt provided on the RPV receiving bracket for fastening the base plate; An O-ring, and the base plate and the RPV receiving bracket are hermetically joined by welding, and the lower end of the RPV foundation bolt is
A reactor containment vessel characterized in that it is hermetically joined to a lower surface of a PV foundation bolt by welding.

According to a fourth aspect of the present invention, an upper dry well and a lower dry well surrounding a reactor pressure vessel of a boiling water reactor are combined with an RPV installed on the outer peripheral side of the reactor pressure vessel.
A reactor containment vessel having a structure in which a pedestal RPV receiving bracket and a lower end flange of an RPV skirt projecting from a lower end side of the reactor containment vessel are separated from each other by a joint, wherein the RPV pedestal and the RPV skirt are separated from each other. As means for hermetically separating the spaces, the RPV
A base plate interposed between the receiving bracket and the RPV skirt, an RPV base bolt provided on the RPV receiving bracket for fastening the base plate, and screwed into the base bolt from an upper surface side of a lower end flange of the RPV skirt; And a seal channel connecting between the RPV receiving brackets and a lower end flange of the RPV skirt via a welding pad is hermetically joined by welding. A nuclear reactor containment is provided.

According to a fifth aspect of the present invention, instead of the cap nut of the fourth aspect, a downwardly-facing concave screw is provided at the lower end flange of the RPV skirt, and the RPV base bolt is connected to the RPV receiving bracket by a stud bolt method. This provides a reactor containment vessel characterized in that the RPV skirt and the RPV receiving bracket are joined.

According to a sixth aspect of the present invention, in the reactor containment vessel according to the fourth aspect, the welding pad is provided on the body of the RPV skirt instead of the lower end flange of the RPV skirt. Provide a containment vessel.

According to a seventh aspect of the present invention, a flat welding pad is interposed between the lower flange of the RPV skirt and the base plate in place of the welding pad and the seal channel according to the fourth aspect of the present invention. Provided is a reactor containment vessel characterized in that a base plate and the base plate and the RPV receiving bracket are each hermetically joined by welding.

According to an eighth aspect of the present invention, there is provided a seal between the RPV skirt and the base plate by the concave groove and the O-ring according to the fourth aspect, a seal by welding the RPV base bolt and the RPV receiving bracket, and a fifth aspect. R
A reactor containment vessel characterized in that a lower end flange of a PV skirt is combined with a seal around a base plate by a welding pad and a seal channel.

According to a ninth aspect of the present invention, an upper dry well and a lower dry well surrounding a reactor pressure vessel of a boiling water reactor are combined with an RPV installed on the outer peripheral side of the reactor pressure vessel.
A reactor containment vessel having a structure in which a pedestal RPV receiving bracket and a lower end flange of an RPV skirt projecting from a lower end side of the reactor containment vessel are separated from each other by a joint, wherein the RPV pedestal and the RPV skirt are separated from each other. As means for hermetically separating the spaces, the RPV
A base plate interposed between the receiving bracket and the RPV skirt; an RPV base bolt provided on the RPV receiving bracket for fastening the base plate; a gap between the RPV skirt and the base plate; In the gap between the bracket and the gap between the RPV skirt and the RPV foundation bolt,
A reactor containment vessel characterized in that the gaps are hermetically sealed by being filled with respective fillers.

According to a tenth aspect of the present invention, in addition to the gap sealing structure of the ninth aspect, a seal channel connecting the lower end flange of the RPV skirt and the RPV receiving bracket via a welding pad is hermetically sealed by welding. A reactor containment vessel characterized by being joined is provided.

According to an eleventh aspect of the present invention, in addition to the sealing by the O-ring and the welding according to the third aspect, a seal channel connecting the RPV receiving bracket to the lower end flange of the RPV skirt via a welding pad is formed by welding. Provided is a containment vessel which is airtightly joined.

According to a twelfth aspect of the present invention, a seal channel connecting between the RPV receiving brackets via a welding pad is provided on a lower end flange of the RPV skirt in place of the sealing by the welding pad and the seal channel according to the fourth aspect. Provided is a reactor containment vessel which is hermetically joined by welding.

According to a thirteenth aspect of the present invention, an upper dry well and a lower dry well surrounding a reactor pressure vessel of a boiling water reactor are provided with an RP installed on an outer peripheral side of the reactor pressure vessel.
A reactor containment vessel having a structure separated from each other by a joint between an RPV receiving bracket of a V pedestal and a lower flange of an RPV skirt projecting from a lower end side of the reactor containment vessel, wherein the RPV pedestal and the RPV are separated from each other.
As means for hermetically isolating from the skirt, the RP
A base plate interposed between the V receiving bracket and the RPV skirt; and an RPV base bolt provided on the RPV receiving bracket for fastening the base plate.
A seal channel connecting the inner surface of the RPV skirt to the inner surface of the RPV skirt via a welding pad is hermetically joined by welding,
A reactor containment vessel characterized in that a lower surface of a PV receiving bracket and a lower portion of the RPV foundation bolt are hermetically joined by welding.

According to a fourteenth aspect of the present invention, an upper dry well and a lower dry well surrounding a reactor pressure vessel of a boiling water reactor are provided with an RP installed on an outer peripheral side of the reactor pressure vessel.
A reactor containment vessel having a structure separated from each other by a joint between an RPV receiving bracket of a V pedestal and a lower flange of an RPV skirt projecting from a lower end side of the reactor containment vessel, wherein the RPV pedestal and the RPV are separated from each other.
As means for hermetically isolating from the skirt, the RP
A base plate interposed between the V receiving bracket and the RPV skirt; and an RPV base bolt provided on the RPV receiving bracket for fastening the base plate.
A part of the RPV pedestal is cut out, an expansion joint is provided for hermetically sealing a gap between the RPV skirt and the RPV receiving bracket through the notch, and an upper nut of the RPV base bolt is surrounded by a cap. A reactor containment vessel characterized in that a gap between the RPV skirt and the cap is hermetically sealed with packing.

According to a fifteenth aspect of the present invention, instead of the expansion joint according to the fourteenth aspect, a seal channel connecting the RPV receiving brackets to the lower end flange of the RPV skirt via a welding pad is hermetically joined by welding. A nuclear reactor containment vessel is provided.

According to a sixteenth aspect of the present invention, instead of the expansion joint according to the fourteenth aspect, a tubular weir is provided in the RPV receiving bracket, an airtight material such as a silicon seal is filled, and the RPV skirt is joined to the RPV receiving bracket. Provided is a reactor containment vessel characterized in that gaps between surfaces are hermetically sealed.

According to a seventeenth aspect of the present invention, an upper dry well and a lower dry well surrounding a reactor pressure vessel of a boiling water reactor are connected to an RP installed on an outer peripheral side of the reactor pressure vessel.
A reactor containment vessel having a structure separated from each other by a joint between an RPV receiving bracket of a V pedestal and a lower flange of an RPV skirt projecting from a lower end side of the reactor containment vessel, wherein the RPV pedestal and the RPV are separated.
As means for hermetically isolating from the skirt, the RP
A base plate interposed between the V receiving bracket and the RPV skirt; and an RPV base bolt provided on the RPV receiving bracket for fastening the base plate.
Atom is characterized in that welding is performed between the base plate and the RPV receiving bracket, and a seal channel is welded between the RPV skirt and an upper plate of the RPV receiving bracket to be sealed in a highly airtight manner. A furnace containment vessel is provided.

[0031] The invention of claim 18 is a reactor containment vessel according to any one of claims 1 to 17, wherein
A configuration in which a part of the RPV pedestal is cut off to form a passage, and the passage is hermetically isolated from the outside by opening and closing means, facing the installation position of the means for hermetically separating the pedestal and the RPV skirt. A nuclear reactor containment is provided.

[0032] The invention of claim 19 is an invention in which an upper dry well and a lower dry well surrounding a reactor pressure vessel of a boiling water reactor are combined with an RP installed on the outer peripheral side of the reactor pressure vessel.
A reactor containment vessel having a structure separated from each other by a joint between an RPV receiving bracket of a V pedestal and a lower flange of an RPV skirt projecting from a lower end side of the reactor containment vessel, wherein the RPV pedestal and the RPV are separated from each other.
As means for hermetically isolating from the skirt, the RP
A base plate interposed between a V receiving bracket and the RPV skirt, the base plate and the RP
A shim plate interposed between the V receiving bracket,
RPV base bolts are provided on the RPV receiving bracket to fasten them, and an O-ring is installed in a concave groove provided on the RPV skirt side surface of the base plate, and the base plate and the RPV receiving bracket Filling a filler material in between, and surrounding a lower nut of the RPV foundation bolt with a cap;
Joining the receiving bracket and the cap by welding,
Provided is a reactor containment vessel which is hermetically sealed.

According to a twentieth aspect of the present invention, in the containment vessel according to the nineteenth aspect, in addition to the filler filled between the base plate and the RPV receiving bracket, a space between the base plate and the RPV receiving bracket is provided. An airtight joint structure welded on the inner or outer periphery thereof, the RP
An airtight joint structure in which the V skirt and the RPV receiving bracket are welded through a welding pad and a seal channel on the inner peripheral side or the outer peripheral side thereof, or the RPV skirt and the base plate are joined between their joint surfaces. Airtight joint structure with the filler inserted in the
A nuclear reactor containment vessel provided with at least one of them.

The invention of claim 21 is the invention of claim 19 or 2
0. The containment vessel according to claim 0, wherein the base plate and the R
A nuclear reactor containment vessel characterized in that an O-ring is provided in a concave groove provided on an upper surface of the RPV receiving bracket, instead of a filler filled between the reactor receiving vessel and the PV receiving bracket.

[0035]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a reactor containment vessel according to an embodiment of the present invention.

First Embodiment (FIGS. 1 to 3) FIG . 1 shows that an upper dry well and a lower dry well are separated from each other by providing a means for isolating between an RPV skirt of a reactor pressure vessel and an RPV receiving bracket of an RPV pedestal. FIG. 1 is an overall schematic cross-sectional view showing a reactor containment vessel.

The containment vessel according to this embodiment is shown in FIG.
As shown in (1), a reactor pressure vessel 4 is provided via an RPV skirt 3 by an RPV pedestal 2 provided in a reactor containment vessel 1. A cylindrical RCCV cylindrical portion 5 and a disc-shaped top slab 6 are arranged on the outer peripheral side of the reactor pressure vessel 4. The RPV pedestal 2 and the reactor shielding wall 2 a are supported by a base slab 7. I have. Further, the RCCV cylindrical portion 5 and the RPV pedestal 2
Are connected by a diaphragm floor 8 at a substantially central position.

The upper dry well 9 is a space surrounded by the upper RCCV cylindrical portion 5, the top slab 6, the diaphragm floor 8, and the RPV pedestal 2 from the RPV skirt 3 of the reactor pressure vessel 4. Further, a lower dry well 10 which is a space surrounded by the base slab 7 and the RPV pedestal 2 below the RPV support skirt 3 of the reactor pressure vessel 4 is formed.

On the outer peripheral side of the lower dry well 10, RC
A suppression chamber 11, which is a space surrounded by the CV 5, the base slab 7, the diaphragm floor 8, and the RPV pedestal 2, is provided. In addition, the suppression chamber 11 is provided with a suppression pool 12 that stores water.

The RPV skirts 3 and R of the reactor pressure vessel 4
At the joint of the PV pedestal 2, an isolation means 13 for airtightly isolating the upper dry well 9 and the lower dry well 10 from each other.
Is given. Thereby, the reactor containment vessel 1 separates the upper dry well 9, the lower dry well 10, and the suppression chamber 11 from each other during plant operation.

The RPV pedestal 2 is provided with a vertical vent pipe 14 dedicated to the upper dry well 9 as a treatment in the event of a main steam pipe rupture accident in the upper dry well 9. Further, the RPV pedestal 2 is provided with a vertical vent pipe 15 dedicated to the lower dry well 10 as a treatment in the event of a small-diameter pipe breakage accident in the lower dry well 10.

FIG. 2 is an enlarged cross-sectional view in which a separating means 13 is provided between the RPV skirt 3 and the RPV receiving bracket 16 shown in FIG.

The reactor pressure vessel 4 is, as shown in FIG.
RPV protruding circumferentially from the side of RPV pedestal 2
It is supported by the receiving bracket 16 via the RPV skirt 3, and an isolation means 13 is provided at this support portion.

That is, the contact surface between the upper surface of the RPV receiving bracket 16 and the lower end flange 3a of the RPV skirt 3 has
A base plate 17 is interposed between the RPV receiving bracket 16 and the lower flange 3 of the RPV skirt 3.
are fastened by RPV base bolts 18 provided on the RPV receiving bracket 16 with the base plate 17 sandwiched therebetween.

A welding pad 20 as a welding carrier is joined to the outer peripheral side of the body of the RPV skirt 3, and between the welding pad 20 and the inner surface of the RPV pedestal 2 facing the welding pad 20. As the separating means 13, a joint which expands and contracts in the horizontal and vertical directions, for example, a bellows 19 is attached via support members 19a and 19b. The bellows 19 is shown as having a structure capable of performing an airtightness test, for example, having two bellows elements.
It may have three bellows elements.

According to this embodiment, the R of the reactor pressure vessel
Since the PV skirt 3 and the RPV receiving bracket 16 of the RPV pedestal 2 can be air-tightly isolated, a reactor containment vessel having a structure in which an upper dry well and a lower dry well are separated can be established.

FIG. 3 is an enlarged sectional view showing an application example of this embodiment.

In the example shown in FIG. 3, a bellows 19 is provided between the RPV pedestal 2 and the RPV skirt 3, and the bellows 19 has a structure in which a pair of bellows elements are integrally formed in the vertical direction.

With such a configuration, the bellows 19 can be expanded and contracted mainly in the vertical direction, and substantially the same effects as those shown in FIG. 2 can be obtained.

The other configuration is substantially the same as that of FIG. 2, and therefore, the same reference numerals as in FIG. 2 are assigned to FIG. 3 and the description is omitted.

Also, in the example of FIG. 3, as shown in FIG. 2, two bellows 19 are provided. However, one bellows 19 may be provided depending on the necessity of the test.

Second Embodiment (FIG. 4) FIG. 4 is an enlarged sectional view showing a second embodiment of the containment vessel according to the present invention.

In this embodiment, as shown in FIG. 4, the RPV skirt 3 which is a reactor pressure vessel leg, an RPV pedestal RPV receiving bracket 16 for supporting the reactor pressure vessel, the RPV skirt 3 and the RPV receiving Bracket 1
The base plate 17 provided between the base 6 and the base plate 17 is supported by being tightened with RPV base bolts 18.

On the upper surface of the base plate 17, RPV
A concave groove 21 is provided along the circumferential direction of the skirt 3, and an O-ring 22 for sealing is installed in the groove 21. Further, between the upper plate 16a of the RPV receiving bracket 16 and the base plate 17, and between the lower plate 16b of the RPV receiving bracket 16, the RPV foundation bolt 18 and the lower nut 23 are hermetically joined by a welded portion 24. .

According to the present embodiment having such a configuration, similarly to the first embodiment, the RPV skirt 3 of the reactor pressure vessel 4 and the RP of the RPV pedestal 2 supporting the RPV skirt 3 are supported.
The V receiving bracket can be isolated with high airtightness, and a reactor containment vessel having a structure in which the upper dry well 9 and the lower dry well 10 are air tightly separated can be established.

Third Embodiment (FIG. 5) FIG. 5 is an enlarged sectional view showing a third embodiment of the containment vessel according to the present invention.

Since the RPV skirt 3 is greatly affected by the thermal expansion received from the reactor pressure vessel, this RPV skirt 3
It may be difficult to directly weld the RPV receiving bracket 16 and the RPV receiving bracket 16.

Therefore, in the present embodiment, a welding pad 20 is provided on the outer peripheral side surface of the lower end flange 3a of the RPV skirt 3, and this welding pad 20 is provided.
Each gap portion is hermetically joined by a welded portion 24 so as to cover each gap portion with a ring-shaped seal channel 26 extending between the gap and the upper surface of the RPV receiving bracket 16.

The upper nut 25 screwed to the upper end of the RPV base bolt 18 has a cap nut structure, whereby the sealing performance of the gap between the RPV base bolt 18 and the RPV skirt 3 is maintained. .

According to the present embodiment configured as described above, similarly to the second embodiment (FIG. 4), the space between the RPV skirt 3 of the reactor pressure vessel and the RPV receiving bracket 16 of the RPV pedestal 2 is airtight. It is possible to separate the upper dry well 9 and the lower dry well 10 with high airtightness.

Fourth Embodiment (FIG. 6) FIG. 6 is an enlarged sectional view between an RPV skirt and an RPV receiving bracket showing a fourth embodiment of the containment vessel according to the present invention.

In this embodiment, as shown in FIG.
A downward concave screw 3b formed by recessing the lower surface of the lower end flange 3a of the V skirt 3 is provided, and the tip (upper end) of the RPV base bolt 18 is screwed to the concave screw 3b. As a result, the lower end flange 3a of the RPV skirt 3 and the RPV receiving bracket 16 are fastened by the stud bolt system with the base plate 17 being inserted by the RPV base bolts 18. That is, since it is not a normal bolt and nut method in which the RPV base bolt 18 is penetrated and tightened,
There is no gas leakage from the top of the RPV base bolt 18.

The lower flange 3 of the RPV skirt 3
a welding pad 20 is provided on the outer peripheral side surface of the base plate 17. The welding pad 20 and the upper plate 16 a of the RPV receiving bracket 16 are provided with an annular seal channel 26 having an inverted L-shaped cross section and covering an end of the base plate 17. The upper and lower ends are respectively welded, and the weld 24
The PV skirt 3 and the RPV receiving pad 20 are hermetically joined. Thereby, the gap between the RPV skirt 3 and the base plate 17 and the gap between the base plate 17 and the RP
Leakage of gas from the gap with the V receiving bracket 16 is prevented.

According to this embodiment, the RPV skirt 3 of the reactor pressure vessel 4 and the RPV
It is possible to hermetically isolate the pedestal from the RPV receiving bracket 16, so that the upper dry well 9 and the lower dry well 10 can be separated spatially and reliably.

Fifth Embodiment (FIG. 7) FIG. 7 is an enlarged sectional view showing the fifth embodiment of the containment vessel according to the present invention.

In this embodiment, as shown in FIG. 7, a welding pad 20 is provided on the outer surface of the torso of the RPV skirt 3, and the RPV skirt 3 is attached to the welding pad 20 and the upper plate 16a of the RPV receiving bracket 16. A seal channel 26 large enough to cover the entire lower end flange 3a is hermetically joined by a weld 24 in the same manner as described above.

Since the other construction is substantially the same as that of the fourth embodiment, the same reference numerals as those in FIGS. 7 and 6 denote the same parts, and a description thereof will be omitted.

According to the fifth embodiment as well, the upper dry well 9 and the lower dry well 10 can be reliably separated.

Sixth Embodiment (FIG. 8) FIG. 8 is an enlarged sectional view showing a sixth embodiment of the containment vessel according to the present invention.

In the nuclear reactor containment vessel of the present embodiment, as shown in FIG.
Through the lower end flange 3a of the
By screwing the cap nut 25 from above a, an airtight seal is performed at the nut portion. The welding pad 20 has a flat structure, and RP
V-skirt 3 lower end flange 3a and base plate 17
And is interposed between them. That is, the RPV bracket 16
Base plate 17, welding pad 20, and lower end flange 3a of RPV skirt 3 on upper plate 16a.
Are sequentially laminated, and these are fastened by the base bolt 18 and the cap nut 25.

The upper plate 16a of the RPV receiving bracket 16 is connected to the base plate 17, and the base plate 17 and the lower end flange 3a of the RPV skirt 3 are connected to each other.
Each is hermetically joined by a weld 24.

According to this embodiment having such a structure,
All gaps at the joint between the RPV skirt 3 and the RPV bracket 16 are closed, and the upper dry well 9 and the lower dry well 10 are isolated with high airtightness.

Seventh Embodiment (FIG. 9) FIG. 9 is an enlarged sectional view showing a seventh embodiment of the containment vessel according to the present invention.

In the reactor containment vessel of this embodiment, the RPV
Receiving bracket 16, base plate 17, and RPV
The lower end flanges 3a of the skirt 3 are sequentially laminated, and these are fastened by a base bolt 18 penetrating in the laminating direction and a nut 23 screwed to the upper and lower end protrusions.

In this structure, the gap between the base bolt 18 insertion portion is sealed by a weld 24 between the lower plate 16 b of the RPV receiving bracket 16 and the lower nut 23.

The gap between the RPV receiving bracket 16 and the base plate 17 and the gap between the base plate 17 and the RP
The gap between the V-skirt 3 and the lower end flange 3 a is sealed by a seal channel 26.

That is, the lower end flange 3 of the RPV skirt 3
a is provided with a welding pad 20, and a welding portion 24 of a seal channel 26 similar to that of the fourth embodiment (FIG. 6).
With this, the above-mentioned lamination gap is sealed.

The base plate 17 has the second
In the same manner as in the embodiment, a concave groove 21 is provided circumferentially on the upper surface, an O-ring 22 is provided in the groove 21, and a gap on the upper nut 25 side is sealed.

With the configuration of the seventh embodiment as well, high airtight isolation between the upper dry well 9 and the lower dry well 10 is performed.

Eighth Embodiment (FIG. 10) FIG. 10 is an enlarged sectional view showing an eighth embodiment of the containment vessel according to the present invention.

In the reactor containment vessel of the present embodiment, the RPV
The contact surface between the foundation bolt 18 and the RPV skirt 3 or the RP
In order to make the contact surfaces between the V skirt 3 and the RPV receiving bracket 16 and the base plate 17 airtight, between the RPV foundation bolt 18 and the upper nut 25, between the upper nut 25 and the RPV skirt 3, and between the RPV skirt 3 and A filler 27 is filled between the base plate 17 and the base plate 17 and the upper plate 16a of the RPV receiving bracket 16 to perform sealing.

According to the present embodiment, similarly to the second embodiment, the space between the RPV skirt 3 of the reactor pressure vessel and the RPV receiving bracket 16 of the RPV pedestal is hermetically sealed, and the upper dry well 9 and the lower dry well 9 are sealed. Dry well 10 can be reliably separated.

Ninth Embodiment (FIG. 11) FIG. 11 is an enlarged sectional view showing a ninth embodiment of the containment vessel according to the present invention.

In this embodiment, the eighth embodiment (FIG. 1)
In addition to the configuration of 0), a seal channel 26 surrounding the upper nut 25 of the RPV base bolt 18 is welded to the welding pad 20 on the trunk of the RPV skirt 3 and the upper plate 16a of the RPV receiving bracket 16 by welding 24, respectively. Are joined.

According to this embodiment, the R of the reactor pressure vessel
In the reactor containment vessel having a structure in which the upper dry well 9 and the lower dry well 10 can be further airtightly separated from the PV skirt 3 and the RPV receiving bracket 16 of the RPV pedestal, it is possible to further separate them. Reliability and safety are improved.

Tenth Embodiment (FIG. 12) FIG. 12 is an enlarged sectional view showing a tenth embodiment of the containment vessel according to the present invention.

This embodiment is basically similar to the seventh embodiment (FIG. 9), except that the seal channel 26 has a large configuration that covers the entire gap. That is, RP
A sealing channel 26 surrounding an upper nut 25 of the V foundation bolt 18 is provided with a welding pad 20 on the body of the RPV skirt 3 and an upper plate 16 of the RPV receiving bracket 16.
and a by a welded portion 24. Since the other configuration is substantially the same as that of the seventh embodiment, the same reference numerals as in FIG. 9 are used in FIG. 12 and the description is omitted.

According to this embodiment, R of the reactor pressure vessel
It is possible to hermetically isolate the PV skirt 3 and the RPV pedestal RPV receiving bracket 16 from each other. In a reactor containment vessel having a structure in which the upper dry well 9 and the lower dry well 10 are separated from each other, the reliability is further improved. And safety can be improved.

Eleventh Embodiment (FIG. 13) FIG. 13 is an enlarged sectional view showing an eleventh embodiment of the containment vessel according to the present invention.

This embodiment is similar to the third embodiment (FIG. 5).
In addition to the fastening structure using the cap nut 25, the RPV base bolt 18 shown in the tenth embodiment (FIG. 12) is used.
Large seal channel 2 surrounding the upper nut 25
6 is welded pad 2 on the trunk of RPV skirt 3
0 and the upper plate 16a of the RPV receiving bracket 16 are hermetically joined by a weld 24. Since other configurations are not different from those of the third and tenth embodiments, the same reference numerals as in FIGS. 5 and 12 are used in FIG. 13 and the description is omitted.

According to the present embodiment, the R of the reactor pressure vessel
It is possible to hermetically isolate the PV skirt 3 and the RPV pedestal RPV receiving bracket 16 from each other, and in a reactor containment vessel having a structure in which the upper dry well 9 and the lower dry well 10 are separated from each other, the reliability is further improved. And improved safety.

Twelfth Embodiment (FIG. 14) FIG. 14 is an enlarged sectional view showing a twelfth embodiment of the containment vessel according to the present invention.

In the reactor containment vessel of this embodiment, the RPV
A welding pad 20 is provided on the inner peripheral side surface of the lower end flange 3a of the skirt 3, and a seal channel 26 having, for example, a U-shaped cross section is formed between the welding pad 20 and the inner trunk 16c of the RPV receiving bracket 16 by a welding portion 24. Airtightly joined by

Also, the lower plate 1 of the RPV receiving bracket 16
6b, the RPV base bolt 18 and the lower nut 23 are also hermetically joined by a weld 24.

According to the present embodiment, the RPV skirt 3 of the reactor pressure vessel and the RPV receiving bracket 16 of the RPV pedestal 2 can be hermetically isolated like the first and second embodiments.

Thirteenth Embodiment (FIGS. 15 and 16) FIG. 15 is a schematic sectional view showing a joint portion between an RPV pedestal 2 and an RPV skirt 3 showing a thirteenth embodiment of a reactor containment vessel according to the present invention. FIG. 16 is an enlarged view of a portion A in FIG.

In the containment vessel of this embodiment, FIG.
As shown in the figure, the reactor pressure vessel 4 of the RPV pedestal 2
A notch space 2a that is depressed to a certain extent is formed in such a manner that the upper portion of the RPV receiving bracket 16 supporting the RPV skirt 3 is retreated to the large diameter side on the inner peripheral surface side facing the above. An isolating means 13 using a bellows 19 which expands and contracts in the horizontal and vertical directions is provided at a position below the cutout space 2a of the RPV pedestal 2.

In the above-described first embodiment (FIGS. 1 to 3), since such a notched space is not provided in the RPV pedestal 2, the distance between the RPV pedestal 2 and the RPV skirt 3 may be small. . In such a narrow space, the isolating means 13 using the bellows 19 is provided at the trunk of the RPV skirt 3, that is, at a certain height, so that it can be used for installation and maintenance work. May cause trouble.

On the other hand, in the present embodiment, the cut-out space 2a is formed in the RPV pedestal 2, so that the installation space for the isolating means 13 can be widened.

That is, as shown in detail in FIG. 16, in this embodiment, since the space expanded by the cutout space 2a can be used, the bellows 19 are arranged horizontally.
Moreover, it can be disposed at a relatively low portion such as the lower end flange 3a of the RPV skirt 3.

In the present embodiment, one support member 19a of the bellows 19 is attached to the outer peripheral side surface of the lower end flange 3a of the RPV skirt 3 via a weld 20.

A cap 28 is attached to the upper end of the base bolt 18, and the cap 28 is
And abuts on the upper surface of the lower end flange 3a of the RPV skirt 3 via the packing 29.

Therefore, by tightening the cap 28, the upper periphery of the RPV foundation bolt 18 can be hermetically isolated through the packing 29 provided on the upper surface of the bottom of the RPV skirt 3.

Although the bellows 19 shown in FIGS. 15 and 16 are provided as a structure capable of performing an airtightness test on the bellows 19, one bellows 19 may be provided depending on the necessity of the test. .

As shown in FIG. 15, the RPV pedestal 2 is provided with an opening / closing section 2b facing the cutout space 2a, and further has a passage section 2c in the opening / closing section 2b. Therefore, access at the time of installation, maintenance, and the like can be easily performed.

According to the present embodiment, similarly to the above embodiments, the RPV skirt 3 of the reactor pressure vessel and the RPV receiving bracket 16 of the RPV pedestal can be air-tightly isolated, and the upper dry space can be obtained. An effect such as that a reactor containment vessel in which the well 9 and the lower dry well 10 are separated can be obtained.

As described above, the structure in which the RPV pedestal 2 is cut away has the effect of improving the workability of mounting the bellows 19 and tightening the bolt cap by expanding the space more than before. Can be

Fourteenth Embodiment (FIGS. 17 and 18) FIG. 17 shows the RPV skirt 3 and the RPV pedestal 2 according to a thirteenth embodiment of the containment vessel according to the present invention.
FIG. 18 is a cross-sectional view between the PV receiving bracket 16 and FIG.
18 is an enlarged sectional view of a portion B in FIG.

In this embodiment, the RPV skirt 3 and the RP
As means for hermetically separating the V-receiving bracket 16 from the
The point where the seal channel 26 is provided is the thirteenth aspect.
Different from the embodiment.

Since the other structure is not different from that of the thirteenth embodiment, FIGS.
The same reference numerals as in Fig. 6 denote the same parts, and a description thereof will be omitted.

In the containment vessel of this embodiment, FIG.
As shown in the figure, a welding pad 20 is provided at the bottom end of the RPV skirt 3. A seal channel 26 connecting the RPV skirt 3 and the RPV receiving bracket 16 via the welding pad 20 is formed.

In the fourteenth embodiment, substantially the same operation and effect as in the thirteenth embodiment can be obtained.

Fifteenth Embodiment (FIGS. 19 and 20) FIG. 19 is a cross-sectional view between an RPV skirt and an RPV receiving bracket of an RPV pedestal showing a fifteenth embodiment of the containment vessel according to the present invention.

FIG. 20 shows the RPV skirt and RP shown in FIG.
It is an expanded sectional view of C part between V receiving brackets.

In this embodiment, the RPV skirt 3 and the RP
A cylindrical weir 30 is provided on the RPV receiving bracket 16 as an isolating means for airtightly separating the V receiving bracket 16 from the V receiving bracket 16.
The difference from the fourteenth embodiment is that the weir 30 is filled with a filler such as a silicon seal 31. Since the other configuration is not different from that of the fourteenth embodiment, the same reference numerals as in FIGS. 17 and 18 are used in FIGS. 19 and 20, and the description is omitted.

In the containment vessel of this embodiment, FIG.
As shown in the figure, a cylindrical weir 30 is provided on the upper plate 16a of the RPV receiving bracket 16. This weir 30 and RPV
A silicon seal 31 or the like is filled between the skirt 3 and the skirt 3.
The silicon seal 31 is filled so as to cover the base plate 5 and the contact surface between the base plate 5 and the bottom of the RPV skirt 3.

In the fifteenth embodiment, substantially the same functions and effects as in the thirteenth embodiment can be obtained.

Sixteenth Embodiment (FIG. 21) FIG. 21 is a sectional view showing an application example of a sixteenth embodiment of a reactor containment vessel according to the present invention, between an RPV skirt 3 and an RPV pedestal 2 between RPV receiving brackets. is there.

The containment vessel of this embodiment is a modification of the fourteenth embodiment shown in FIG. Then, welding 24 is performed between the base plate 5 and the upper plate 16a of the RPV receiving bracket 16 to ensure airtightness.

A seal channel 25 is mounted between the welding pad 20 attached to the lower end flange 3a of the RPV skirt 3 and the upper plate 16a of the RPV receiving bracket 16 according to the degree of airtightness required.

In the sixteenth embodiment, substantially the same operation and effect as in the thirteenth embodiment can be obtained.

Seventeenth Embodiment (FIG. 22) FIG . 22A shows a seventeenth embodiment of a containment vessel according to the present invention.
It is an expanded sectional view showing an embodiment, and Drawing 2 (b) is a DD sectional view of Drawing 1 (a).

In this embodiment, as shown in these figures, the lower end flange 3a of the RPV skirt 3, which is the leg portion of the reactor pressure vessel, the RPV receiving bracket 16 of the RPV pedestal for supporting the reactor pressure vessel, and the RPV The base plate 17 provided between the skirt 3 and the RPV receiving bracket 16 is supported by being tightened by RPV base bolts 18.

As means for hermetically isolating between the RPV pedestal and the RPV skirt 3, a shim plate 32 of a predetermined size disposed between the base plate 17 and the upper plate 16a of the RPV receiving bracket 16,
A ring-shaped filler 27 is provided at a position inside the base bolt 18 so as to be interposed between the shim plates 32. As the filler 27, a soft metal or a sticky substance is applied, so that the base plate 17 and the RP
The space between the V-receiving bracket 16 and the upper plate 16a is hermetically sealed.

On the upper surface of the base plate 17, R
A concave groove 21 is provided along the circumferential direction of the PV skirt 3, and an O-ring 22 for sealing is provided in the groove 21. Further, the lower nut 2 of the RPV foundation bolt 18
3 is surrounded by a cap 28, and this cap 28 and RP
The lower plate 16b of the V-receiving bracket 16 is joined to the lower plate 16b by a welded portion 24 and hermetically sealed.

According to the present embodiment having such a configuration, as in the second embodiment, the RPV skirt 3 of the reactor pressure vessel 4 and the RP of the RPV pedestal 2 supporting the RPV skirt 3 are supported.
It is possible to isolate the V-receiving bracket from the V-receiving bracket with high airtightness, and a reactor containment vessel having a structure in which the upper dry well 9 and the lower dry well 10 are air-tightly separated can be established.

Eighteenth Embodiment (FIG. 23) FIG. 23 is an enlarged sectional view showing a eighteenth embodiment of a reactor containment vessel according to the present invention.

In this embodiment, as shown in FIG. 23, the basic structure is the same as that of the seventeenth embodiment. In addition, the base plate 17 and the upper plate 16a of the RPV receiving bracket 16 are The inner peripheral side is hermetically joined by a weld 24. Other configurations are substantially the same as those of the seventeenth embodiment, and therefore, the same reference numerals as in FIG.

According to the eighteenth embodiment, the upper dry well 9 and the lower dry well 10 can be further reliably separated.

Nineteenth Embodiment (FIG. 24) FIG. 24 is an enlarged sectional view showing a nineteenth embodiment of a containment vessel according to the present invention.

In this embodiment, as shown in FIG. 24, the basic structure is the same as in the seventeenth embodiment. In addition to this, the base plate 17 and the upper plate 16a of the RPV receiving bracket 16 are The outer peripheral side is hermetically joined by a weld 24. Other configurations are substantially the same as those of the seventeenth embodiment, and therefore, the same reference numerals as in FIG.

According to the eighteenth embodiment as well, the upper dry well 9 and the lower dry well 10 can be more reliably separated.

Twentieth Embodiment (FIG. 25) FIG. 25 is an enlarged sectional view showing a twentieth embodiment of the containment vessel according to the present invention.

In this embodiment, as shown in FIG. 25, the basic structure is the same as that of the seventeenth embodiment. In addition, a welding pad is provided on the outer surface of the lower end flange 3a of the RPV skirt 3. 20 seal channel 2 connecting between upper plates 16a of RPV receiving bracket 16 through
6 are hermetically joined by a weld 24. Since the other configuration is substantially the same as that of the seventeenth embodiment, FIG.
The same reference numerals as those in FIG.

According to the twentieth embodiment, the upper dry well 9 and the lower dry well 10 can be separated more reliably.

Twenty-First Embodiment (FIG. 26) FIG. 26 is an enlarged sectional view showing a twenty-first embodiment of a containment vessel according to the present invention.

In this embodiment, as shown in FIG. 26, the basic structure is the same as that of the seventeenth embodiment. In addition to this, in addition to the inner peripheral surface of the lower end flange 3a of the RPV skirt 3, , The inner body 16 c of the RPV receiving bracket 16 is joined to the inner body 16 c via the welding pad 24 and the seal channel 26 by the welding portion 24, whereby the RP
Upper plate 16a of V receiving bracket 16 and base plate 1
7 is hermetically sealed. The other configuration is substantially the same as that of the seventeenth embodiment.
The same reference numerals as those in FIG.

According to the twenty-first embodiment, the upper dry well 9 and the lower dry well 10 can be separated more reliably by the seal channel 26.

Twenty-second Embodiment (FIG. 27) FIG. 27 is an enlarged sectional view showing a twenty-second embodiment of the containment vessel according to the present invention.

In this embodiment, as shown in FIG. 27, the basic structure is the same as that of the seventeenth embodiment. In addition, a welding pad 20 is provided on the outer peripheral surface of the trunk of the RPV skirt 3. The seal channel 26 is welded by the welding portion 24 through the
The V-receiving bracket 16 is hermetically joined to the upper plate 16a by a weld 24. The other configuration is substantially the same as that of the seventeenth embodiment, and therefore, the same reference numerals as in FIG.

According to the twenty-second embodiment, the upper dry well 9 and the lower dry well 10 can be reliably separated by the seal channel 26.

Twenty-third Embodiment (FIG. 28) FIG. 28 is an enlarged sectional view showing a twenty-third embodiment of a reactor containment vessel according to the present invention.

In this embodiment, the base plate 17 and the upper plate 16 of the RPV receiving bracket 16 shown in FIG.
As shown in FIG. 28, an O-ring 22 is provided in a concave groove 21 provided in the upper surface 16a of the RPV receiving bracket, instead of the filler 27 inserted between the O-ring 22 and the a.
The other configuration is substantially the same as that of the seventeenth embodiment.
Are denoted by the same reference numerals as in FIG. 22A, and description thereof is omitted.

According to the twenty-third embodiment, the upper dry well 9 and the lower dry well 10 can be surely separated by the O-ring 22, as in the above embodiments.

Twenty-fourth Embodiment (FIG. 29) FIG. 29 is an enlarged sectional view showing a twenty-fourth embodiment of the containment vessel according to the present invention.

In this embodiment, the concave groove 21 and the O-ring 2 provided on the base plate 17 shown in FIG.
As shown in FIG. 29, a structure is used in which the space between the lower end flange 3a of the RPV skirt 3 and the base plate 17 is sealed by filling the joint surfaces thereof with a filler 27a, as shown in FIG. The material of the filler 27a is the same as the filler 27 described above. The other configuration is substantially the same as that of the seventeenth embodiment.
The same reference numerals as those in FIG.

According to the twenty-fourth embodiment, the upper dry well 9 and the lower dry well 10 can be reliably separated.

Other Embodiments In addition to the above embodiments, the present invention can be implemented by variously combining the above embodiments.

[0149]

As described in detail above, according to the containment vessel according to the present invention, even if the containment vessel is of a type that hermetically isolates the upper drywell space and the lower drywell space, Isolation means having a highly airtight isolation function is established, and the reactor containment vessel in which the upper dry well and the lower dry well are separated can be configured.

[Brief description of the drawings]

FIG. 1 is an overall schematic cross-sectional view showing a first embodiment of a containment vessel according to the present invention.

FIG. 2 is a cross-sectional view showing the first embodiment in which an RPV skirt, an RPV receiving bracket, and highly airtight isolation means are applied.

FIG. 3 is an enlarged cross-sectional view showing a modification of the first embodiment.

FIG. 4 is an enlarged sectional view showing a second embodiment of the containment vessel according to the present invention.

FIG. 5 is an enlarged sectional view showing a third embodiment of the containment vessel according to the present invention.

FIG. 6 is an enlarged sectional view showing a fourth embodiment of the containment vessel according to the present invention.

FIG. 7 is an enlarged sectional view showing a fifth embodiment of the containment vessel according to the present invention.

FIG. 8 is an enlarged sectional view showing a sixth embodiment of the containment vessel according to the present invention.

FIG. 9 is an enlarged sectional view showing a seventh embodiment of the containment vessel according to the present invention.

FIG. 10 is an enlarged sectional view showing an eighth embodiment of the containment vessel according to the present invention.

FIG. 11 is an enlarged sectional view showing a ninth embodiment of the containment vessel according to the present invention.

FIG. 12 is an enlarged sectional view showing a tenth embodiment of the containment vessel according to the present invention.

FIG. 13 is an enlarged sectional view showing an eleventh embodiment of the containment vessel according to the present invention.

FIG. 14 is an enlarged sectional view showing a twelfth embodiment of the containment vessel according to the present invention.

FIG. 15 is a schematic sectional view between an RPV skirt and an RPV pedestal showing a thirteenth embodiment of a containment vessel according to the present invention.

FIG. 16 is an enlarged view of a portion A in FIG. 15;

FIG. 17 is a cross-sectional view between an RPV skirt and an RPV pedestal showing a fourteenth embodiment of a reactor containment vessel according to the present invention.

FIG. 18 is an enlarged view of a portion B in FIG. 17;

FIG. 19 is a schematic sectional view between an RPV skirt and an RPV pedestal showing a fifteenth embodiment of the containment vessel according to the present invention.

20 is an enlarged sectional view of a portion C between the RPV skirt and the RPV receiving bracket of FIG. 19;

FIG. 21 is a cross-sectional view between an RPV skirt and an RPV receiving bracket showing a sixteenth embodiment of a containment vessel according to the present invention.

FIG. 22 (a) is a view showing a first example of a reactor containment vessel according to the present invention.
7B is an enlarged cross-sectional view illustrating the seventh embodiment, and FIG.
FIG.

FIG. 23 is an enlarged sectional view showing an eighteenth embodiment of a reactor containment vessel according to the present invention.

FIG. 24 is an enlarged sectional view showing a nineteenth embodiment of a reactor containment vessel according to the present invention.

FIG. 25 is an enlarged sectional view showing a twentieth embodiment of the containment vessel according to the present invention.

FIG. 26 is an enlarged sectional view showing a twenty-first embodiment of the containment vessel according to the present invention.

FIG. 27 is an enlarged sectional view showing a twenty-second embodiment of the reactor containment vessel according to the present invention.

FIG. 28 is an enlarged sectional view showing a twenty-third embodiment of the containment vessel according to the present invention.

FIG. 29 is an enlarged sectional view showing a twenty-fourth embodiment of the containment vessel according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Reactor containment vessel, 2 ... RPV pedestal, 2a ... Reactor shielding wall, 3 ... RPV skirt, 4 ... Reactor pressure vessel, 5 ... RCCV cylindrical part, 6 ... Top slab, 7 ... Foundation slab, 8 ... Diaphragm Floor 9 Upper dry well 10 Lower dry well 11 Suppression chamber 12 Suppression pool 13 Isolation means 14 Vertical vent pipe dedicated to upper dry well 15
Vertical vent pipe for lower drywell, 16 RPV receiving bracket, 16a upper plate, 16b lower plate, 16c inner body, 17 base plate, 18 RPV base bolt,
19 ... bellows, 20 ... welding pad, 21 ...
Recessed groove, 22 ... O-ring, 23 ... Lower nut, 24 ...
Welded part, 25 ... upper nut, 26 ... seal channel,
27 ... filler, 28 ... cap, 29 ... packing, 30
... weir, 31 ... silicone seal, 32 ... shim plate.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yukio Fujiwara 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Inside the Toshiba Yokohama Office (72) Inventor Mitsuhiro Goto 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Company Toshiba Yokohama Office

Claims (21)

[Claims] An upper drywell and a lower drywell surrounding a reactor pressure vessel of a boiling water reactor are connected to an RPV pedestal installed on an outer peripheral side of the reactor pressure vessel and a lower end side of the reactor containment vessel. A reactor containment vessel having a structure in which the RPV pedestal and the RPV skirt are isolated from each other by a joint with the RPV skirt projecting from the RPV pedestal and the RPV skirt. A containment vessel that covers a joint portion and includes a telescopic joint. 2. The reactor containment vessel according to claim 1, wherein the expansion joint has a bellows extending and contracting in at least one of a horizontal direction and a vertical direction between the RPV pedestal and the RPV skirt. A containment vessel for a nuclear reactor. 3. An RPV pedestal RP of an RPV pedestal installed on an outer peripheral side of a reactor pressure vessel, wherein an upper dry well and a lower dry well surrounding a reactor pressure vessel of a boiling water reactor are provided.
A containment vessel having a structure in which a V-receiving bracket and a lower end flange of an RPV skirt protruding from a lower end side of the containment vessel are separated from each other by a joint portion,
As means for hermetically isolating between the RPV pedestal and the RPV skirt, a base plate interposed between the RPV receiving bracket and the RPV skirt, an RPV base provided on the RPV receiving bracket and fastening these A bolt is provided, an O-ring is provided in a concave groove provided on a surface of the base plate on the side of the RPV skirt, and the base plate and the RP
A reactor containment vessel characterized in that a V-receiving bracket is hermetically joined by welding, and a lower end of the RPV foundation bolt is hermetically joined to a lower surface of the RPV foundation bolt by welding. 4. An RPV pedestal RP of an RPV pedestal installed on the outer peripheral side of a reactor pressure vessel, wherein an upper dry well and a lower dry well surrounding a reactor pressure vessel of a boiling water reactor are provided.
A containment vessel having a structure in which a V-receiving bracket and a lower end flange of an RPV skirt protruding from a lower end side of the containment vessel are separated from each other by a joint portion,
As a means for hermetically isolating the RPV pedestal and the RPV skirt, a base plate interposed between the RPV receiving bracket and the RPV skirt, and an RPV base provided on the RPV receiving bracket and fastening these Bolts and the RP
An upper nut screwed from the upper surface side of the lower flange of the V skirt, and the upper nut has a cap nut structure. A containment vessel, characterized in that the connecting seal channels are hermetically joined by welding. 5. An RPV instead of the cap nut according to claim 4.
A concave screw is provided on the lower end flange of the skirt, and the RPV base bolt is attached to this concave screw by a stud bolt method.
The containment vessel, wherein the RPV skirt and the RPV receiving bracket are joined by being connected to a receiving bracket. 6. The containment vessel according to claim 4, wherein the welding pad is provided on the body of the RPV skirt instead of the lower end flange of the RPV skirt. 7. A welding pad and a seal channel according to claim 4, wherein a flat welding pad is interposed between a lower end flange of the RPV skirt and the base plate, and the welding pad and the base plate and the base plate are provided. A reactor containment vessel characterized in that the reactor containment vessel and the RPV receiving bracket are hermetically joined by welding. 8. The seal between the RPV skirt and the base plate by the concave groove and the O-ring according to claim 4, the seal by welding between the RPV base bolt and the RPV receiving bracket, and the lower end flange of the RPV skirt according to claim 5. A reactor containment vessel characterized by combining a seal around a base plate with a welding pad and a seal channel. 9. An RPV pedestal RP of an RPV pedestal installed on the outer peripheral side of a reactor pressure vessel, wherein an upper dry well and a lower dry well surrounding a reactor pressure vessel of a boiling water reactor are provided.
A containment vessel having a structure in which a V-receiving bracket and a lower end flange of an RPV skirt protruding from a lower end side of the containment vessel are separated from each other by a joint portion,
As means for hermetically isolating between the RPV pedestal and the RPV skirt, a base plate interposed between the RPV receiving bracket and the RPV skirt, an RPV base provided on the RPV receiving bracket and fastening these A bolt, and the gap between the RPV skirt and the base plate, the gap between the base plate and the RPV receiving bracket, and the gap between the RPV skirt and the RPV base bolt are filled with respective fillers, so that each of the fillers is filled. A containment vessel characterized in that the gap is hermetically sealed. 10. In addition to the gap sealing structure according to claim 9,
A containment vessel, characterized in that a seal channel connecting between the RPV receiving brackets and a lower end flange of the RPV skirt via a welding pad is hermetically joined by welding. 11. In addition to the seal by the O-ring and the welding according to claim 3, a seal channel connecting between the RPV receiving brackets to the lower end flange of the RPV skirt via a welding pad is hermetically joined by welding. A reactor containment vessel characterized by the above. 12. The RP according to claim 4, wherein the sealing is performed by a welding pad and a seal channel.
A containment vessel, characterized in that a seal channel connecting the RPV receiving brackets to the lower end flange of the V-skirt via a welding pad is hermetically joined by welding. 13. An RPV pedestal installed on an outer peripheral side of a reactor pressure vessel, comprising an upper dry well and a lower dry well surrounding a reactor pressure vessel of a boiling water reactor.
A reactor containment vessel having a structure in which a PV receiving bracket and a lower end flange of an RPV skirt projecting from a lower end side of the reactor containment vessel are separated from each other by a joint portion, wherein a space between the RPV pedestal and the RPV skirt is provided. As means for airtight isolation, a base plate interposed between the RPV receiving bracket and the RPV skirt, and an RPV base bolt provided on the RPV receiving bracket and fastening the same are provided. A seal channel connecting the inner surface of the RPV receiving bracket via a welding pad is hermetically joined by welding, and a lower surface of the RPV receiving bracket and a lower portion of the RPV base bolt are hermetically joined by welding. Reactor containment vessel. 14. An RPV pedestal installed on the outer peripheral side of a reactor pressure vessel, comprising an upper dry well and a lower dry well surrounding a reactor pressure vessel of a boiling water reactor.
A reactor containment vessel having a structure separated from each other by a joint between a PV receiving bracket and a lower end flange of an RPV skirt projecting from a lower end side of the reactor containment vessel, wherein a space between the RPV pedestal and the RPV skirt is provided. A part of the RPV pedestal includes a base plate interposed between the RPV receiving bracket and the RPV skirt, and an RPV base bolt provided on the RPV receiving bracket to fasten the base plate. A notch is provided, an expansion joint is provided to hermetically seal the gap between the RPV skirt and the RPV receiving bracket through the notch, and an upper nut of the RPV base bolt is surrounded by a cap, and the RPV skirt and the It is characterized in that the gap with the cap is sealed airtight with packing. Reactor containment vessel. 15. An expansion joint according to claim 14, wherein a seal channel connecting the RPV receiving brackets to the lower end flange of the RPV skirt via a welding pad is hermetically joined by welding. Reactor containment vessel. 16. An expansion joint according to claim 14, wherein R
A reactor containment vessel characterized in that a cylindrical weir is provided in a PV receiving bracket, filled with an airtight material such as a silicon seal, and a gap between a joint surface between the RPV skirt and the RPV receiving bracket is airtightly sealed. 17. An RPV pedestal installed on the outer peripheral side of a reactor pressure vessel, comprising an upper dry well and a lower dry well surrounding a reactor pressure vessel of a boiling water reactor.
A reactor containment vessel having a structure in which a PV receiving bracket and a lower end flange of an RPV skirt projecting from a lower end side of the reactor containment vessel are separated from each other by a joint portion, wherein a space between the RPV pedestal and the RPV skirt is provided. The airtight isolation means includes a base plate interposed between the RPV receiving bracket and the RPV skirt, and an RPV base bolt provided on the RPV receiving bracket for fastening the base plate and the RPV receiving bracket. Welding between bracket and
A reactor containment vessel characterized in that a seal channel is welded between the RPV skirt and the upper plate of the RPV receiving bracket by welding to provide a hermetic seal. 18. The reactor containment vessel according to claim 1, wherein the RPV pedestal and the RP
It faces the installation position of the means for hermetically isolating the VPV from the V-skirt, cuts off a part of the RPV pedestal to form a passage, and the passage is hermetically isolated from the outside by opening and closing means. Reactor containment vessel. 19. An upper dry well and a lower dry well surrounding a reactor pressure vessel of a boiling water reactor are connected to an RPV pedestal installed on the outer peripheral side of the reactor pressure vessel.
A reactor containment vessel having a structure in which a PV receiving bracket and a lower end flange of an RPV skirt projecting from a lower end side of the reactor containment vessel are separated from each other by a joint portion, wherein a space between the RPV pedestal and the RPV skirt is provided. As means for airtight isolation, a base plate interposed between the RPV receiving bracket and the RPV skirt, a shim plate interposed between the base plate and the RPV receiving bracket, and provided on the RPV receiving bracket RPV foundation bolts for fastening these, an O-ring is installed in a concave groove provided on the surface of the base plate on the side of the RPV skirt, and a filler is filled between the base plate and the RPV receiving bracket. , And the lower nut of the RPV foundation bolt with a cap Circumference, and the RPV received by welding a bracket and the cap, a containment vessel, characterized in that the hermetically sealed. 20. The containment vessel according to claim 19, wherein the base plate and the RP are provided in addition to a filler filled between the base plate and the RPV receiving bracket.
A hermetic joint structure welded to the V-receiving bracket on the inner or outer peripheral side thereof; a welding pad and a seal channel between the RPV skirt and the RPV receiving bracket on the inner or outer peripheral side thereof; And a hermetic joint structure welded through a joint, or a hermetic joint structure using a filler material in which the RPV skirt and the base plate are inserted between their joint surfaces. container. 21. The containment vessel according to claim 19, wherein the filler filled between the base plate and the RPV receiving bracket is replaced with a concave groove provided on an upper surface of the RPV receiving bracket. A PCV characterized by a ring.