JP3222597B2 - Concrete structures in the containment vessel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete structure in a reinforced concrete reactor containment vessel.

[0002]

2. Description of the Related Art As shown in FIG. 5, a conventional reactor containment vessel 1 in a nuclear power generation facility is made of reinforced concrete, and has a structure in which a liner 2 is lined inside. The interior of the containment vessel 1 is divided into an upper dry well 5, a lower dry well 6, and a suppression chamber 7 by a diaphragm floor 3 and a pedestal 4. A reactor pressure vessel 8 is supported on the pedestal 4.

In the lower dry well 6, a lower dry well augmented concrete (hereinafter referred to as L / D concrete) 9 is cast mainly for adjusting the volume of the reactor containment vessel 1. This L / D concrete 9 has a plurality of sump pits 10 as drain treatment facilities in the lower dry well 6.
Is installed.

Here, the sump pit 10 in the lower drywell 6 belongs to the class B in the seismic class, but the L / D concrete 9 to support it is as described in the conventional example.
The structure of the reactor containment vessel 1 was mainly used as puff concrete mainly for adjusting the volume and arranging the equipment, and was a member in which only reinforcements for preventing cracks were arranged.

[0005]

As described above, L /
The seismic class of the sump pit 10 installed in the D concrete 9 belongs to the B class, but the L / D concrete supporting it is about the same as a structure positioned as puffed concrete, and can be used as a support member. The challenge is not having the requirements.

An object of the present invention is to provide a concrete structure in a containment vessel in which L / D concrete can withstand a shear force during an earthquake.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a tubular pedestal is erected from the bottom of a reinforced concrete reactor containment liner lined with a liner, and a lower drywell augmented concrete having a sump pit is formed on the bottom of the pedestal. In the concrete structure in the installed containment vessel, a shear plate or a stud bolt is installed on the pedestal which is in close contact with the drywell augmented concrete.

[0008]

By installing a shear plate or stud bolt on the pedestal, the L / D concrete has a structure that can withstand the shearing force at the time of the earthquake, and functions as a support structure for the sump pit.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a concrete structure in a containment vessel according to the present invention will be described with reference to FIGS. FIG. 1 is a longitudinal sectional view showing a reactor containment vessel 1 in which a shear plate 11 is provided on a lower inner surface of a pedestal 4 in this embodiment, and FIG.
FIG. 3 is an enlarged vertical sectional view showing a portion provided with 11; FIG.
FIG. 2 is a cross-sectional view taken along the line AA of FIG.

In FIG. 1, a containment vessel 1 is a containment vessel made of reinforced concrete, and has a structure in which a liner 2 is stretched inside. A pedestal 4 for supporting a reactor pressure vessel is erected at the center of the containment vessel 1, and a reactor pressure vessel 8 is installed and supported on the pedestal 4.

A reactor shield wall 12 is provided on the reactor pressure vessel supporting pedestal 4 so as to surround the reactor pressure vessel 8. A diaphragm floor 3 is horizontally arranged at a central position in the vertical direction of the reactor containment vessel 1.

The reactor containment vessel 1 is partitioned into an upper dry well 5, a lower dry well 6, and a suppression chamber 7 by the diaphragm floor 3 and the pedestal 4. An L / D concrete 9 having a sump pit 10 is provided below the lower dry well 6.

Next, the installation state of the shear plate 11 and the sump pit 10 installed on the pedestal 4 will be described with reference to FIGS. An L / D concrete 9 having a sump pit 10 is poured into a lower portion of the lower dry well 6, and a shear plate 11 is provided inside the zone of the L / D concrete 9 of the pedestal 4 as shown in FIG. Install at each point on the circumference.

The pedestal 4 has a shear plate 11
Is provided, the L / D concrete 9 has a structure that withstands a shear force during an earthquake. Therefore, according to the above embodiment, the structure of the L / D concrete 9 suitable for the seismic class of the sump pit 10 can be obtained.

Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment differs from the first embodiment in that a stud bolt 13 is used in place of the shear plate 11. The other parts have the same structure as in the first embodiment, and the description of the overlapping parts will be omitted.

In FIG. 4, a stud bolt 13 is a stud bolt having a screw at both ends of a round steel material, and one end thereof is previously implanted at a lower end of the pedestal 4. The other end of the stud bolt 13 is fixed by pouring the L / D concrete 9 so that the pedestal 4 and the L / D concrete 9 are integrated.

According to this embodiment, the L / D concrete 9 can withstand the shearing force at the time of the earthquake.

[0018]

According to the present invention, an L / D concrete structure serving as a support member function corresponding to the earthquake-resistant class of the sump pit can be provided, which greatly contributes to ensuring the safety of a nuclear power plant. There is.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a reactor containment vessel for explaining a first embodiment of a concrete structure in a reactor containment vessel according to the present invention.

FIG. 2 is an enlarged longitudinal sectional view showing the concrete structure in FIG. 1;

FIG. 3 is a transverse sectional view cut along the direction of arrows AA in FIG. 2;

FIG. 4 is a longitudinal sectional view showing a reactor containment vessel for explaining a second embodiment of the concrete structure in the reactor containment vessel according to the present invention.

FIG. 5 is a longitudinal sectional view showing a conventional containment vessel for explaining a concrete structure in a conventional containment vessel.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Reactor containment vessel, 2 ... Liner, 3 ... Diaphragm floor, 4 ... Pedestal, 5 ... Upper dry well, 6 ... Lower dry well, 7 ... Suppression chamber, 8 ... Reactor pressure vessel, 9 ... L / D concrete , 10 ... Sump pit, 11 ... Shear plate, 12 ... Reactor shielding wall, 13 ... Stud bolt.

Claims (1)

(57) [Claims] 1. A tubular pedestal is erected from the bottom of a reinforced concrete reactor containment vessel lined with a liner,
In a concrete structure in a reactor containment vessel in which a lower drywell augmented concrete having a sump pit at the bottom in the pedestal is placed, a shear plate or stud bolt is installed on the pedestal which is in close contact with the drywell augmented concrete. A concrete structure in a containment vessel, characterized in that: