JP2899658B2 - Seismic isolation structure of nuclear power plant building - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a nuclear power plant, in which a particularly important nuclear containment building is seismically isolated not only horizontally but also vertically when an earthquake occurs. It relates to the seismic isolation structure of the power plant building.

[Problems to be solved by conventional technology and invention]

A horizontal seismic isolation structure has been put into practical use in which the building of a nuclear power plant is made horizontal with a horizontal seismic isolation device during an earthquake. However, in the event of an earthquake, various attempts have been made experimentally and analytically to achieve seismic isolation in the vertical direction in addition to horizontal seismic isolation. This leads to an extension of the vertical natural vibration period of the building, and as a result, the rocking vibration of the building swinging its head is increased, which is a dangerous problem, and its realization has been hindered.

The present invention has been made in view of the above-mentioned conventional situation, and has been made to solve the problem, and enables horizontal and vertical three-dimensional seismic isolation of a reactor containment building to improve safety during an earthquake. It aims to provide a seismic isolation structure for a nuclear power plant building that can be secured to the maximum.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a nuclear power plant building comprising a reactor containment building and a reactor attachment building, wherein the reactor containment building and the reactor attachment building are each a separate structure as a reactor containment building. The three-dimensional seismic isolation system that segregates the cycle of the reactor with the building attached to the reactor through the horizontal seismic isolation device for the ground and the reactor containment building in the horizontal and vertical directions for the ground The structure is characterized by the seismic isolation structure of a nuclear power plant building in which the reactor containment building is connected to the reactor building via upper and lower seismic isolation devices.

[Action]

The reactor containment building supported on the ground via flexible three-dimensional seismic isolation devices in the horizontal and vertical directions is isolated from both horizontal and vertical earthquake motions. This leads to an extension of the vertical natural vibration period of the vehicle, which causes rocking vibration of the building swinging its head.

However, the reactor containment building is independent of this, and is connected to a rigid reactor attachment building supported on the ground via a vertically rigid horizontal seismic isolation device. Vibration is suppressed by the reactor building, and the vertical displacement between the reactor containment building and the reactor building is absorbed by the vertical seismic isolation device to maximize the safety of the reactor containment building during an earthquake. Is secured.

〔Example〕

 Hereinafter, the present invention will be described in detail based on the illustrated embodiment.

FIG. 1 is a longitudinal sectional view schematically showing a nuclear building adopting the seismic isolation structure of the present invention, and FIG. 2 is a plan view of the building. In FIG. The reactor containment building in the center, 3 is a reactor attachment building constructed around the reactor containment building 2, and 4 is a fuel rod replacement space provided on the upper floor of the reactor containment building 2. The reactor containment building 2 and the reactor attachment building 3 are independent structures with a predetermined gap therebetween. The reactor building 3 is supported on the ground 5 via a horizontal seismic isolation device 6, and the reactor containment building 2 is supported on the ground 5 via a three-dimensional seismic isolation device 7 which is seismically isolated in both horizontal and vertical directions. In addition, the reactor containment building 2 further moves the vertical seismic isolation device 8
Adjacent side parts are connected via a.

As shown in FIGS. 3 to 5, each seismic isolation device is formed by laminating an elastic plate such as a rubber material to a required thickness. It is almost rigid in the direction and soft in the horizontal direction, and the upper and lower surfaces can be elastically displaced horizontally and parallel to each other. The horizontal vibration of the ground 5 is absorbed by the horizontal and parallel displacement of the upper and lower surfaces, and the building is horizontally isolated. Let it.

The three-dimensional seismic isolation device 7 increases the thickness of the elastic plate vertically stacked on the horizontal seismic isolation device, and is flexible not only in the horizontal direction but also in the vertical direction. Vibration is absorbed by both the elastic horizontal parallel relative displacement of the upper and lower surfaces and the vertical elastic expansion and contraction, and the building is three-dimensionally isolated.

The vertical seismic isolation device 8 lays the horizontal seismic isolation device 6 in the horizontal direction so that the elastic plates are stacked in the horizontal direction, and is substantially rigid in the horizontal direction and flexible in the vertical direction.

In the building 1 of the above-mentioned nuclear power plant, the reactor containment building 2 and the reactor attachment building 3 are independent structures, and the reactor containment building 2 is flexible and tertiary in the vertical direction. Since the building 3 attached to the reactor is supported on the ground 5 via the horizontal seismic isolation 6 which is substantially rigid in the vertical direction and soft in the horizontal direction, The reactor containment building 2 is seismically isolated for both horizontal and vertical earthquake motions, and the reactor attachment building 3 is isolated for only horizontal earthquake motions.

Here, the reactor containment building 2 generates rocking vibrations in which the building swings its head due to the extension of the vertical natural vibration period accompanying the vertical seismic isolation, but the reactor containment building 2 has a rigidity in the vertical direction. Since the adjacent sides are connected to the high reactor building 3 via the vertically rigid seismic isolation device 8 in the horizontal direction, this rocking vibration is suppressed by the reactor building 3 and the reactor is housed. Building 2 and reactor attached building 4
The vertical displacement of the reactor containment building 2 is absorbed by the flexible vertical seismic isolation device 8 in the vertical direction, and the safety of the reactor containment building 2 at the time of the earthquake is maximized.

〔The invention's effect〕

As described above, the seismic isolation structure of the nuclear power plant building of the present invention is a nuclear power plant building comprising a reactor containment building and a reactor attachment building, wherein the reactor containment building and the reactor attachment building are each The reactor containment building is surrounded by a reactor attachment building as an independent structure.The reactor attachment building is placed on the ground via a horizontal seismic isolation device, and the reactor containment building is placed both horizontally and vertically with respect to the ground. Conventionally, horizontal and vertical seismic isolation is achieved by supporting each of the reactor containment buildings via a vertical seismic isolation device with the reactor containment building via a three-dimensional seismic isolation device that is seismically isolated. The realization of three-dimensional seismic isolation, which was caused by the occurrence of rocking vibration in the building due to the vertical seismic isolation, was hampered. Safety substation building is what an effect that is secured to the maximum.

[Brief description of the drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view schematically showing a nuclear building employing the seismic isolation structure of the present invention.
2 is a plan view of the building, FIG. 3 is a side view of the horizontal seismic isolation device, FIG. 4 is a side view of the three-dimensional seismic isolation device, and FIG. 5 is a side view of the vertical seismic isolation device. 1. Nuclear power plant building 2. Reactor containment building 3.
………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………………………………… 上下 上下 上下 ８ ８ ８ ８.

Claims (1)

(57) [Claims] A nuclear power plant building comprising a reactor containment building and a reactor attachment building, wherein the reactor containment building and the reactor attachment building are each an independent structure, and the periphery of the reactor containment building is a reactor. Surrounded by the annex building, the reactor annex building is supported by the horizontal seismic isolation device against the ground, and the reactor containment building is supported by the three-dimensional seismic isolation device that isolates the ground horizontally and vertically. A seismic isolation structure for a nuclear power plant building, wherein the containment building of the reactor is connected to the building attached to the reactor via a vertical seismic isolation device.