JPH1020068A - Sealing structure for nuclear reactor containment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply lateral support to a side part of a nuclear reactor containment so as to lower stress in a leg part. SOLUTION: A sealing structure arranged between a nuclear reactor housing vessel 1, which is stood on base concrete 5 and surrounds a nuclear reactor vessel, and a cylindrical external shielding wall 3 surrounding the nuclear reactor containment 1 is constructed as a sealing-base isolating structure 20 constructed of a base isolating lamination formed by sticking iron plates 25 and rubbers 37 alternately and a ring type metallic bellows 29 surrounding the base isolating structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a containment vessel, and more particularly to a seal and a support structure outside a containment vessel.

[0002]

2. Description of the Related Art In a pressurized water reactor, a containment vessel 1 as shown in FIG. 3 is used, and an outer shielding wall 3 which is a concrete structure surrounds the outside thereof. Such a containment vessel 1 is manufactured as a steel pressure vessel, but is erected on a foundation concrete 5 cast on rock. And its bottom end plate 1a
Is finally embedded in the bottom concrete 7, and a reactor vessel and a reactor primary cooling system connected to the reactor vessel are provided on the internal concrete structure. The so-called reactor secondary cooling system devices such as turbine generators are installed in the building outside the external shielding wall, so the piping connecting them is provided in a manner that penetrates the lower part of the reactor containment in an airtight manner. ing. An annulus seal 9 is provided to isolate such a penetrating portion from the outside. Annulus seal 9
Are shown in FIGS. 4 and 5. The annulus seal 9 is configured by mounting a rubber joint 15 (FIG. 5) between a gantry 11 attached to the outer shielding wall 3 and a gantry 13 attached to the outer peripheral surface of the reactor containment vessel 1. The space below the so-called annulus space is isolated by the annulus seal 9 from the atmospheric space.

[0003]

The above-described annulus seal separates the annulus space from the atmospheric space while allowing relative displacement between the reactor containment vessel and the outer shielding wall, and a penetration portion which may be generated for some reason. Traps leaks from However, the conventional annulus seal has no function of supporting the containment vessel. For this reason, when the pressure of the internal atmosphere of the containment vessel increases due to an accident or the like, a large load acts on the legs adjacent to the bottom concrete, and the stress becomes severe. Therefore, an object of the present invention is to provide a sealing structure for a reactor containment vessel that also has a seismic isolation support function.

[0004]

According to the present invention, there is provided a reactor containment vessel standing on a foundation concrete and surrounding a reactor vessel, and a reactor containment vessel standing on the foundation concrete. The seal structure interposed between the cylindrical outer shielding wall surrounding the reactor containment vessel is composed of an annular seismic isolation laminated structure and an annular metal bellows surrounding the seismic isolated laminated structure. You. This seismic isolation laminated structure is preferably formed by alternately stacking and bonding rubber and an iron plate.

[0005]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same parts are denoted by the same reference numerals throughout the drawings including the drawings showing the conventional structure. First, referring to FIG. 1, a reactor containment vessel 1 manufactured as a steel pressure vessel is erected on a foundation concrete 5 cast on rock. The containment vessel 1 is a cylindrical vessel having a diameter of about several tens of meters, and is closed at the top and bottom with a hemispherical shell end plate. The bottom head 1a is finally embedded in the bottom concrete 7, and a reactor vessel and a reactor primary cooling system connected to the reactor vessel are provided on an internal concrete structure (not shown). Equipment of a so-called secondary reactor cooling system such as a turbine generator is provided in a building outside the external shielding wall 3. An annular seal / seismic isolation structure above the lower part of the containment vessel where the piping connecting the primary cooling system and the secondary cooling system of the reactor, the sleeve surrounding them, and the equipment carrying passage are provided 20 are provided.

FIG. 2 shows details of the seal / isolation structure 20. In FIG. 2, an iron plate 25 and a rubber 2 are provided between a mounting plate 21 fixed to the outer surface of the body plate of the reactor containment vessel 1 and a mounting plate 23 fixed to the inner surface of the outer shielding wall 3.
7 are provided alternately and laminated. Further, the seismic isolation laminate is covered with upper and lower annular metal bellows 29 to form a seal / isolation structure 20.

[0007] The seal and seismic isolation structure 2 having the above configuration
At 0, the seismic isolation laminate and the metal bellows 29 are both deformable, and the annular space between the reactor containment vessel 1 and the outer shielding wall 3 is raised and lowered while allowing the relative displacement of the reactor containment vessel 1. It separates and separates the lower annulus space from the air space to confine internal leaks. Furthermore, since the seismic isolation laminate bears the load while absorbing the relative displacement, the reactor containment vessel 1
Relieves excessive stress on the legs.

[0008]

As described above, according to the present invention, the seismic isolation laminate is incorporated in the sealing structure provided between the reactor containment vessel and the outer shielding wall, so that the leg of the reactor containment vessel can be used. Excessive stress can be relieved.

[Brief description of the drawings]

FIG. 1 is an elevation view of an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing an arrow II portion of FIG. 1 in an enlarged manner.

FIG. 3 is an elevation view showing an example of a conventional structure.

FIG. 4 is an enlarged sectional view showing an arrow IV part of FIG. 3 in an enlarged manner.

FIG. 5 is a partially enlarged sectional view showing an arrow V portion of FIG. 4 in an enlarged manner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reactor containment vessel 3 External shielding wall 5 Foundation concrete 7 Bottom concrete 20 Sealing and seismic isolation structure 21 Mounting plate 23 Mounting plate 25 Iron plate 27 Rubber 29 Metal bellows

Claims (1)

[Claims] 1. A reactor containment vessel erected on a foundation concrete and surrounding a reactor vessel, and a cylindrical outer shielding wall erected on the foundation concrete and surrounding the reactor containment vessel. A seal structure for a reactor containment vessel, wherein the seal structure to be interposed comprises an annular seismic isolation laminated structure and an annular metal bellows surrounding the seismic isolated laminated structure.