JPH0114558B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a seismic isolation structure for a nuclear reactor.

BACKGROUND ART Conventionally, a nuclear reactor a in a nuclear power plant is housed in a reactor containment vessel c that is integrally formed with a building b built on the ground. In the case of such a nuclear reactor a, there is a problem in that the building b and the reactor containment vessel c resonate during an earthquake, and the vibrations cause damage to the reactor equipment.

For this reason, components such as the main steam piping, the reactor pressure vessel shroud, and the channel box before the fuel assembly had to be made more robust, which increased construction costs.

Purpose of the Invention This invention makes it possible to reduce the cost of internal equipment such as piping by separating the reactor containment vessel and the building, or the building and the support structure, and reducing mutual resonance. The purpose is to provide a seismic isolation structure for nuclear reactors.

Structure of the Invention One of the inventions of this application achieves the above object by separating the nuclear containment vessel from the building and interposing a seismic isolation device and a rupture device between the two.

The other invention of this application achieves the above object by separating the building from the supporting structure and interposing a seismic isolation device and a breaking device between the two.

Embodiments Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

What is shown in FIGS. 2 and 3 is an embodiment of the invention in which the reactor containment vessel 1 and the building 2 are separated.

First, in FIG. 2, the foundation 4 that supports the reactor containment vessel 1 and the shell wall 3 is cut off from the foundation 5 of the building 2. The shell wall 3 and the building 2 are separated on each floor. Furthermore, the fuel pool 6 and dryer separator pool 7, which are integrally formed with the shell wall 3 and the building 2, are also edged.

A seismic isolation device 8 is interposed between the nuclear reactor containment vessel 1 and the building 2, which are separated as described above. The seismic isolation device 8 is interposed vertically between the foundation 4 and the foundation 5, etc.

What is shown in FIG. 4 is one embodiment of the seismic isolation device 8. In the seismic isolation device 8, height adjustment frames 9, 9 are fixed to face each other vertically, and four laminated rubber 10 are interposed and fixed between the height adjustment frames 9, 9. The laminated rubber 10 is made by stacking circular iron plates and rubber sheets alternately.

As shown in FIG. 5, a cross-shaped support frame 11 is erected on the lower height adjustment frame 9 between the four rubber layers 10 for maintenance and inspection. Two cross-shaped upper frames 12 having a U-shaped cross section are in contact with the upper height adjustment frame 9 in correspondence with the support frame 11. A friction material 12a is interposed between the upper height adjustment frame 9 and the upper frame 12, and serves as a friction damper.

The inner flange 12b of the upper frame 12 is connected to the support frame 11.
It can be slid up and down.

A plurality of mounting members 13a having holes each having a female thread are fixed to the support frame 11, and bolts 13 are screwed into the holes. A support piece 14 is fixed to the middle of the bolt 13, and the bolt 13
A coil spring 15 is inserted through the support piece 14 . The upper end of the coil spring 15 is brought into contact with the lower surface of the upper frame 12, and in this way, a plurality of members each having a friction material 12a placed on the coil spring 15 are interposed between the reactor containment vessel 1 and the building 2.

A breaking device 16 is interposed between the side surface of the reactor containment vessel 1 and the side surface of the building 2. In the embodiment, a breaking device 16 is interposed between the building 2 and the foundation 4 that supports the reactor containment vessel 1 and the shell wall 3.

As the breaking device 16, one shown in FIG. 6 or 7 can be adopted.

The breaking device 16 shown in FIG. 6 has brackets 17, 17 protruding from each other and slightly shifted up and down.
Support plates 18, 18 having vertical cylindrical insertion holes are fixed to the brackets 17, 17, and a steel breakable rod 19 having a constricted middle is inserted into the insertion holes of the support plates 18, 18 and fixed. has been done.

The breaking device 16 shown in FIG.
0 is fixed to a U-shaped support plate 21 having a cylindrical insertion hole at its tip, and a steel breakable rod 22 having a constricted middle is inserted into the insertion hole. 23 is a height adjustment bolt inserted into a long hole drilled in the steel breaking rod 22. Further, a shear transmission plate 24 is fixed to the other bracket 20 and is perpendicular to the steel breaking rod 22, and is placed close to the constriction of the steel breaking rod 22.

Another embodiment shown in FIG.
This is a case where the outer shell wall 3, the fuel pool 6, and the dryer separator pool 7 are formed integrally, and a bracket 25 is provided protruding from the side of the fuel pool 6 and the dryer separator pool 7, and a seismic isolation structure is provided between the building 2 and the bracket 25. A device 8 is interposed.

In the seismic isolation structure as described above, when a large shear force is generated due to an earthquake, the constricted portions of the steel breaking rods 19 and 22 of the breaking device 16 break. In this state, the reactor containment vessel 1 becomes free in the horizontal direction, and the laminated rubber 10 with low horizontal rigidity
This avoids resonance. Laminated rubber 10
Even if the coil spring 15 is damaged, the load can be supported by the coil spring 15.

Next, other inventions shown in FIGS. 8 and 9 will be explained.

The inventions shown in FIGS. 8 and 9 are Building 2 and Building 2.
The edges are cut between the support structures 26 that support the.

The conventional building 2 is continuous with the ground and has a support structure 26.
The entire building resonated with the earthquake, but this invention was developed by using a supporting structure 2 that is continuous with the ground.
6 and the building 2 to reduce resonance.

The support structure 26 is constructed in a rectangular shape by being dug down slightly from the ground surface, and the center is dug down in a square shape. The building 2 is constructed so that the center thereof protrudes downward in correspondence with the support structure 26.

The aforementioned seismic isolation device 8 is interposed between the support structure 26 and the building 2, and a breaking device 16 is interposed between the side surface of the support structure 26 and the two side surfaces of the building.

Effects of the Invention As described above, this invention separates the reactor containment vessel and the building, or the building and the support structure, and interposes a seismic isolation device and a rupture device, thereby reducing the resonance caused by earthquakes and reducing the main steam piping. There is no need to make nuclear reactor equipment more robust than before, making it possible to reduce costs.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a conventional nuclear reactor and building, FIGS. 2 and 3 are longitudinal sectional views of an embodiment of the invention according to this application, and FIG. 4 is a longitudinal sectional view of a seismic isolation device. 5 is a plan view, FIGS. 6 and 7 are side views of the breaking device, FIG. 8 is a longitudinal sectional view of another embodiment of the invention according to this application, and FIG. 9 is a plan view of the support structure. It is. 1... Reactor containment vessel, 2... Building, 3... Shell wall, 4... Foundation, 5... Foundation, 6... Fuel pool, 7... Dryer separator pool, 8...
... Seismic isolation device, 9 ... Height adjustment frame, 10 ... Laminated rubber, 16 ... Breaking device, 19, 22 ... Steel breaking rod, 26 ... Support structure.

Claims (1)

[Claims] 1. The reactor containment vessel and the building are separated, and seismic isolation devices are arranged above and below between the reactor containment vessel and the building,
This is a seismic isolation structure for a nuclear reactor that connects the side of the reactor containment vessel and the side of the building using a rupture device. Interposed between buildings,
The laminated rubber is fixed to the reactor containment vessel and the building, respectively, and a plurality of members each having a friction material placed on a spring are interposed between the reactor containment vessel and the building, and the rupture device is fixed to the reactor containment vessel and the building. A seismic isolation structure for a nuclear reactor, characterized in that a reactor containment vessel and a building are connected by interposing a steel breaking rod with a constricted middle between brackets fixed to the vessel and the building, respectively. 2. A seismic isolation structure for a nuclear reactor in which the building and support structure are separated, seismic isolation devices are placed above and below between the building and the support structure, and the building and support structure are connected by a breaking device. , the seismic isolation device has a plurality of laminated rubbers made of overlapping rubber sheets and iron plates interposed between the support structure and the building, and the laminated rubbers are fixed to the support structure and the building, respectively, and are mounted on springs. A plurality of members carrying friction materials are interposed between the support structure and the building, and the breaking device has a steel breaking rod with a constricted middle interposed between brackets fixed to the support structure and the building, respectively. A seismic isolation structure for a nuclear reactor characterized by connecting a support structure and a building.