JP2962913B2 - Reactor building - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reactor building in which an internal concrete structure in a reactor building has a reduced seismic load.

[0002]

[Prior art and its problems] The building of a pressurized water reactor is
As shown in FIG. 1, each upper structure is composed of an independent reactor containment vessel 1, an internal concrete structure 2, and a building 3 around the reactor. The internal concrete structure 2 includes a reactor 4, a steam generator 5, and the like. Important equipment is supported. In addition, from the viewpoint of the seismic safety of the reactor building, the base plate 6 is installed on a solid rock, and the reactor containment vessel 1, the internal concrete structure 2, and the building 3 around the reactor are placed on the base plate 6. Is provided. This reactor building employs a so-called seismic design method that resists earthquakes with strength, but the response (acceleration, stress, etc.) of the reactor building during an earthquake becomes extremely large.

[0003] Furthermore, the response behavior of the reactor building during an earthquake is such that when the base plate 6 is used as an earthquake input position, the reactor containment vessel 1, the internal concrete structure 2, and the building 3 around the reactor sway independently. On the other hand, equipment such as the reactor 4 and the steam generator 5 is affected by the vibration of the internal concrete structure 2. For this reason, the reactor 4, the steam generator 5, and their supporting structures are required to have seismic design to withstand the effects of the vibration during the earthquake, and as a result, the reactor 4 and the steam generator 5 are larger than those determined from the design conditions at the time of the accident. May be a simple design.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and an object of the present invention is to reduce the response of an internal concrete structure 2 during an earthquake. , And a reasonable seismic design of the steam generator 5 and its supporting structure.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a reactor building having an internal concrete structure for supporting a nuclear reactor and a steam generator in a reactor containment vessel, and from an outer peripheral portion of the internal concrete structure to the reactor containment vessel. A concrete floor slab protrudes horizontally toward the slab, and a vibration damping device is installed between the floor slab and the inner wall of the containment vessel.
It is preferable that the vibration damping device has a viscoelastic sheet sandwiched between laminated steel sheets.

[0006]

The amount of response of the containment vessel during an earthquake limits the response of the internal concrete structure, so that the amount of response of the internal concrete structure is significantly reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the reactor building according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a reactor building, in which a reactor containment vessel 1, an internal concrete structure 2, and a building 3 around a reactor are installed on a base plate 6, and an internal concrete structure erected in a vertical cylindrical shape. The body 2 supports important equipment such as a reactor 4 and a steam generator 5. A floor slab 7 made of concrete is horizontally protruded from a substantially central portion of the outer peripheral portion of the internal concrete structure 2 toward the containment vessel 1.

As described above, in a conventional reactor building,
Although the upper structures of the containment vessel 1 and the internal concrete structure 2 were independent of each other, in the present invention, both are connected by a vibration damping device.

FIG. 2 is an enlarged view of the vibration damping device 10 installed between the inner wall of the containment vessel 1 and the concrete floor slab 7. As the vibration damping device 10, various types can be adopted. Here, as an example, a vibration-absorbing sheet 12 is interposed between a pair of laminated steel plates 11a and 11b, and the vibration is absorbed by viscous resistance. Laminated steel sheet 11a
The supporting plate 13a is fixed by bolts 16a to a fixing plate 15a fixed to the inner wall of the reactor containment vessel 1 by embedding bolts 14a. The support plate 13 of the laminated steel plate 11b
b is fixed to a fixing plate 15b fixed to the outer peripheral portion of the floor slab 7 by embedding bolts 14b with bolts (not shown). Therefore, the laminated steel plates 11a and 11b move horizontally independently via the viscoelastic sheet 12, and as a result, the history generated in the viscoelastic sheet 12 absorbs vibration energy.

FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 2. The vibration damping device 10 extends over the entire outer periphery of the floor slab 7 based on the results of vibration tests and seismic response analysis. At appropriate intervals, they are installed so as to provide uniform performance in the horizontal direction. The installation method of the vibration damping device 10 can be changed to a method other than the above-described FIGS. 2 and 3.
By rotating 0 at 90 °, it is possible to reduce the horizontal and vertical loads during an earthquake.

Since the inside of the containment vessel 1 has a constant temperature of about 50 ° C. and a high radiation level, the vibration damping device 10 must be suitable for this environment. In the present embodiment, as the viscoelastic sheet 12, a silicon-based rubber that has obtained a high resistance to deterioration even at high temperatures by an experiment was employed. The viscoelastic sheet 12 has a remarkable hysteresis damping effect even in a minute deformation region, and it was confirmed that the intended purpose was achieved.

A telescopic cover 17 is provided above the vibration damping device 10 for the purpose of shielding radiation to prevent deterioration due to radiation.

[0013]

The reactor building according to the present invention can reduce the response of an internal concrete structure during an earthquake with a simple configuration. Therefore, rational earthquake-resistant design of the internal concrete structure and other supporting structures can be performed without changing the basic design concept of the conventional reactor building.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a reactor building.

FIG. 2 is an enlarged view of a vibration damping device and an installation portion thereof.

FIG. 3 is a cross-sectional view of the vibration damping device taken along the line III-III in FIG. 2;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 reactor containment vessel 2 internal concrete structure 3 building around reactor 6 base slab 7 floor slab 10 damping device 11 laminated steel plate 12 viscoelastic sheet

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshio Maekawa 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Tokyo Head Office (72) Inventor Kenta Kabayama 2-5-1 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Heavy Industries, Ltd. (56) References JP-A-51-137089 (JP, A) JP-A-62-250993 (JP, A) Jpn. Sho 61-173099 (JP, U) (58) Fields investigated (Int.Cl. ⁶ , DB name) G21C 13/024 GDP E04B 1/20 E04H 9/02 351 F16F 15/02 G21C 13/00

Claims (2)

(57) [Claims] In a reactor building having an internal concrete structure supporting a nuclear reactor and a steam generator in a reactor containment vessel, from an outer peripheral portion of the internal concrete structure.
Project the concrete floor slab horizontally into the PCV.
Is set, reactor construction shop, characterized in that installed damping device between the floor plate and the containment vessel of the inner wall. 2. A viscoelastic seal between laminated steel sheets, wherein
The reactor building according to claim 1, wherein the reactor is sandwiched between the reactors.
Ya .