JP2000171583A - Liner construction method of reactor container and liner structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To weld a bottom liner and a liner plate and inspect a welded part from both the surface sides of a member by installing the bottom liner on the foundation and then welding and sealing the lower end part of the liner plate for forming the side wall part of a container at the bottom liner. SOLUTION: A bottom liner 21 of a reactor container that is formed by welding and sealing a plurality of steel plates flatly is installed on the concrete foundation 20 that is constructed in advance, a liner plate 22 is placed on the upper surface, and a lower end part is welded to the upper surface of the bottom liner 21 for sealing (23). The welding 23 can be reliably made from both the side surfaces of the liner plate 22, and further non-destructive inspection can also be made from both the side surfaces of the liner plate 22. A reinforced member 24 with T-shaped section being extended vertically is welded (25) to the outer-periphery side of the liner plate 22, and concrete is placed with the liner plate 22 as an inner form, thus forming a side wall part 7 and at the same time burying the reinforced member 24 into the side wall part 7, and strongly supporting the liner plate 22 in the building frame of the side wall part 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a liner of a containment vessel and a liner structure.

[0002]

2. Description of the Related Art FIG. 3 is a longitudinal sectional view showing an example of a concrete reactor containment vessel. The reactor containment vessel has a hollow containment vessel main body 2 erected on a foundation 1,
A pedestal 4 erected on the foundation 1 so as to be located inside the containment vessel main body 2 and supporting the reactor pressure vessel 3 on the upper portion, and a vertically intermediate portion of the inner peripheral surface of the containment vessel main body 2 The pedestal 4 includes a diaphragm floor 5 extending substantially horizontally toward an upper end of the pedestal 4, and a top head 6 for closing an upper end opening of the storage container main body 2.

[0003] The containment vessel main body 2, pedestal 4, and diaphragm floor 5 are integrally formed by a reinforced concrete structure.

A pipe connected to the reactor pressure vessel 3 is provided on the upper dry well 8 which is a space surrounded by the upper surface of the diaphragm floor 5, the inner peripheral surface of the side wall 7 of the containment vessel body 2, and the lower surface of the top head 6. In the lower drywell 9, which is a space surrounded by the inner peripheral surface of the pedestal 4 and the upper surface of the foundation 1, devices such as a control rod driving device of the reactor pressure vessel 3 are disposed. I have.

A main steam pipe 12 is provided in the suppression chamber 10, which is a space surrounded by the upper surface of the foundation 1, the inner peripheral surface of the side wall 7 of the containment vessel body 2, the outer peripheral surface of the pedestal 4, and the lower surface of the diaphragm floor 5. The water 11 for condensing the steam sent through the vent pipe 13 when the safety valve attached to is operated is stored.

Further, as shown in FIG. 4, which is an enlarged view of a portion IV in FIG. 3, the storage container main body 2 has a cylindrical base portion 14 that covers a lower end portion of the inner peripheral surface of the side wall portion 7 and an inner portion of the side wall portion 7. A liner plate 15 covering a portion other than the lower end of the peripheral surface and a bottom liner 16 covering the upper surface of the foundation 1 are provided so as to maintain airtightness.

A receiving member 17 which projects substantially horizontally toward the inside of the storage container main body 2 (see FIG. 3) is fixed to an intermediate portion of the cylindrical base 14 in the vertical direction. Has an anchor member 18 fixed thereto.

Conventionally, when constructing a containment vessel made of concrete, a cylindrical base 14 is installed at a predetermined position, and then concrete is cast to form a foundation 1.

Next, a plurality of steel plates are welded on the upper surface of the foundation 1 to form a bottom liner 16 covering the foundation 1, and the edge of the bottom liner 16 is welded and fixed to the upper surface of the receiving member 17 of the cylindrical base 14. I do.

A liner plate 15 is fixedly welded to the upper end of the cylindrical base 14, and concrete is cast using the liner plate 15 as an inner mold to form the side wall 7.

[0011]

However, in the conventional reactor containment vessel, since the concrete foundation 1 is in contact with the lower side of the receiving member 17 of the cylindrical base 14, the bottom liner 16 is placed on the upper surface of the receiving member 17. Must be fixed by welding from the upper surface side, the welded portion between the edge of the bottom liner 16 and the receiving member 17 is one-sided welding from the upper surface, and non-destructive inspection of the welded portion can be performed only from the upper surface side. Did not.

Further, since a plurality of steel plates are welded on the upper surface of the foundation 1 to form the bottom liner 16, the welding operation time at the workshop is long.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a method for constructing a liner for a reactor containment vessel capable of performing welding work between a bottom liner and a liner plate and inspecting a welded portion from both sides of the member. It is intended to provide a liner structure.

[0014]

According to the first aspect of the present invention, there is provided a method for constructing a liner for a containment vessel according to the present invention, wherein a bottom liner is installed on a foundation, and then the containment vessel is mounted on the bottom liner. The lower end of the liner plate forming the side wall portion is fixed by welding.

In the liner structure for a containment vessel according to a second aspect of the present invention, a bottom liner for covering an inner bottom surface of the containment vessel, and a lower end portion is welded and fixed to an upper surface of the bottom liner, and the containment vessel is provided. And a liner plate capable of covering the inner peripheral surface of the liner.

Further, in the liner structure of the containment vessel according to claim 3 of the present invention, a bottom liner for covering an inner bottom surface of the containment vessel, and a lower end is welded and fixed to an upper surface of the bottom liner, and the containment vessel is provided. And a reinforcing member fixed to a surface of the liner plate on the outer side of the containment vessel.

In the method for constructing a liner of a containment vessel according to the first aspect of the present invention, the lower end of the liner plate is welded to the upper surface of the bottom liner installed on the foundation from both sides thereof. Inspection is performed from both sides of the liner plate.

Further, claim 2 or claim 3 of the present invention.
In any of the reactor containment liner structures described in the above, the lower end of the liner plate is welded from both sides to the upper surface of the bottom liner covering the inner bottom surface of the containment vessel, and the inspection of the welded portion is performed on the liner plate. Perform from both sides.

Further, in the liner structure of the containment vessel according to claim 3 of the present invention, the reinforcing member fixed to the outer surface of the containment vessel of the liner plate is incorporated into the reinforced concrete structure body. The plate is firmly supported on the frame.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an example of an embodiment of a liner structure of a reactor containment vessel according to the present invention. In constructing a liner of the reactor containment vessel, concrete is cast first. To form a foundation 20.

Separately, a plurality of steel plates are flatly welded and fixed to form a bottom liner 21.

The diameter of the bottom liner 21 is larger than the diameter of the inner surface of the side wall 7 constituting the storage container main body 2 shown in FIG.

Further, in forming the bottom liner 21, reliable welding can be performed from both sides of the steel plate at both sides of the groove, and nondestructive inspection can be performed from both sides of the steel plate.

The bottom liner 21 thus formed
Is placed on a foundation 20 as shown in FIG. 1, a liner plate 22 is placed on the upper surface of a bottom liner 21, and the lower end of the liner plate 22 is welded 23 to the bottom liner 2.
1 is fixed to the upper surface.

The welding 23 can be reliably performed from both sides of the liner plate 22, and a nondestructive inspection can be performed from both sides of the liner plate 22.

The outer peripheral side of the liner plate 22 (FIG. 1)
(Right side of FIG. 2), a vertically extending T-shaped reinforcing member 24 as shown in FIG.

Then, when concrete is cast using the liner plate 22 as the inner mold, the side wall 7 similar to that shown in FIG.
Is formed, and the reinforcing member 24 is embedded in the concrete of the side wall 7, and firmly supports the liner plate 22 with respect to the skeleton of the side wall 7.

The method for constructing the liner of the containment vessel and the liner structure of the present invention are not limited to the above-described embodiment, but may be modified without departing from the scope of the present invention. It is.

[0030]

As described above, according to the method for constructing the liner of the reactor pressure vessel and the liner structure of the present invention, the following various excellent effects can be obtained.

(1) In the method for constructing a liner of a containment vessel according to the first aspect of the present invention, the lower end of the liner plate is welded to the upper surface of the bottom liner installed on the foundation from both sides thereof. In addition, since the welds can be inspected from both sides of the liner plate, the reliability of the liner of the reactor pressure vessel is improved.

(2) Since the lower end of the liner plate is welded to the upper surface of the bottom liner installed on the foundation, a plurality of steel plates can be joined in advance by welding on both sides to form the bottom liner. In addition, it is possible to shorten the welding time on site.

(3) Claim 2 or Claim 3 of the present invention
In any of the reactor containment liner structures described in the above paragraph, the lower end of the liner plate can be welded to the upper surface of the bottom liner covering the inner bottom surface of the containment vessel from both sides thereof, and the inspection of the welded portion is performed by the liner Since it can be performed from both sides of the plate, the reliability of the liner of the reactor pressure vessel is improved.

(4) Since the lower end of the liner plate is welded to the upper surface of the bottom liner that covers the inner bottom surface of the containment vessel, a plurality of steel plates can be joined in advance by welding on both sides to form the bottom liner. Therefore, it is possible to shorten the welding time on site.

(5) Further, in the liner structure of the containment vessel according to claim 3 of the present invention, the reinforcing member fixed to the outer surface of the containment vessel of the liner plate is provided on the reinforced concrete structure body. Since it is incorporated, the liner plate can be firmly supported on the skeleton.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of an embodiment of a liner structure of a containment vessel of the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a longitudinal sectional view showing an example of a reactor containment vessel.

4 shows an example of a conventional containment vessel of FIG.
It is an enlarged view of a part.

[Explanation of symbols]

 7 Side wall portion 20 Foundation 21 Bottom liner 22 Liner plate 23 Welding 24 Reinforcing member

Claims (3)

[Claims] 1. A method for constructing a liner for a reactor containment vessel, comprising: mounting a bottom liner on a foundation; and welding and fixing a lower end of a liner plate forming a side wall of the containment vessel to the bottom liner by welding. 2. A bottom liner for covering an inner bottom surface of the storage container,
And a liner plate having a lower end welded and fixed to an upper surface of the bottom liner and capable of covering an inner peripheral surface of the containment vessel. 3. A bottom liner covering an inner bottom surface of the storage container,
A liner plate having a lower end welded to the upper surface of the bottom liner and capable of covering the inner peripheral surface of the containment vessel, and a reinforcing member fixed to the outer surface of the liner plate on the outer side of the containment vessel. A liner structure for a reactor containment vessel.