JPS6328271B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nuclear reactor facility in a nuclear power plant such as a fast breeder reactor, and more particularly to a nuclear reactor facility housing a reactor containment vessel.

Conventionally, in nuclear power plants for fast breeder reactors and the like, a reactor containment vessel is provided in a reactor auxiliary building, and a reactor building including a reactor pressure vessel is incorporated into this reactor containment vessel. An equipment loading/unloading port is formed in the side wall of the reactor containment vessel, and various nuclear reactor equipment is loaded/unloaded through this equipment loading/unloading port during periodic reactor inspections, fuel changes, etc.
When carrying in and out various equipment, the reactor operation is stopped and the work is carried out.

However, since conventional reactor containment vessels have only one equipment loading/unloading entrance, when carrying out reactor equipment, the loading/unloading equipment collides with each other, making it difficult to carry out the loading/unloading work smoothly. This caused problems such as the reactor shutdown period being prolonged.

On the other hand, during the construction of a nuclear reactor plant, there is a lot of work to bring in reactor equipment to be housed in the reactor containment vessel, so a temporary entrance was set up in addition to the equipment entrance to facilitate the work to bring in various reactor equipment. We are working to shorten the plant construction period by making it possible for the plant to be constructed as quickly as possible.

However, the temporary entrance had to be restored and blocked after the reactor equipment was brought in, and this blocking work was complex and took a long time, causing delays in the reactor plant construction period.

This invention takes the above-mentioned points into account, and by forming a plurality of equipment loading/unloading entrances on the side wall of the reactor containment vessel, the work time required for loading/unloading various nuclear reactor equipment is shortened, and the operational availability of the nuclear reactor plant is improved. The purpose of this project is to provide a nuclear reactor facility that increases the efficiency of nuclear power plants and eliminates the need for temporary equipment entrances during plant construction.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show nuclear reactor facilities in a nuclear power plant such as a fast breeder reactor, and reference numeral 10 in the figures indicates a reactor auxiliary building constructed on a foundation mat 11. A reactor containment vessel 12 is installed in the center of this reactor auxiliary building 10. Reactor containment vessel 1
The reactor building 13 is housed in the reactor building 1.
A reactor pressure vessel (not shown) is provided in the center of the reactor 3.

Two equipment loading/unloading ports 16, 16 are formed in the side wall of the reactor containment vessel 12, spaced apart from each other in the circumferential direction. Equipment loading/unloading entrances 16, 16 are in the reactor building 1
Equipment loading/unloading passages 18, 1 are located at a level corresponding to the operation floor A of No. 3, communicate the inside and outside of the reactor containment vessel 12, and are formed within the reactor auxiliary building 10.
It leads to 8. The loading/unloading passages 18, 18 are also provided at the same height position as the equipment loading/unloading entrances 16, 16. For this reason, when carrying in and out, for example, large equipment through the equipment carry-in/out ports 16, 16, the reactor pressure vessel does not obstruct the carrying in/out of the equipment. Further, equipment can be directly carried in and out between the outside of the building and the inside of the reactor containment vessel 12 via the equipment carry-in/out entrances 16, 16 and the equipment carry-in/out passages 18, 18.

As shown in FIG. 3, the equipment loading/unloading port 16 of the reactor containment vessel 12 is formed in a cylindrical body 20 fixed to the side wall of the reactor containment vessel 12 by welding or the like.
The cylindrical body 20 preferably has a cylindrical shape, and its axis is perpendicular to the side wall surface of the reactor containment vessel 12.
The opening of the cylindrical body 20 is hermetically covered by a lid 21 inside the reactor containment vessel 12 . Lid body 21
has a lid flange 22, and this flange 22 is removably attached to a cylindrical body flange 23 integrally formed at the end of the cylindrical body 20 by means of attachment means such as mounting bolts 24, and both flange surfaces are O. It is closely attached by a sealing member 25 such as a ring. However,
The cylindrical body 20 and both flanges 23 and 24 reinforce the equipment loading/unloading port 16, and the internal space of the cylindrical body 20 forms an effective space for loading/unloading various nuclear reactor equipment.

In FIG. 1, reference numeral 27 indicates an air lock for workers, and this air lock is also airtightly attached to the side wall of the reactor containment vessel 12.

Next, the operation of this invention will be explained.

During normal operation of a nuclear reactor plant, the equipment loading/unloading entrance 16 formed in the reactor containment vessel 12 is connected to the lid body 2.
1 to form a reactor containment vessel boundary.

During periodic inspection work or fuel exchange work on a nuclear reactor, the operation of the nuclear reactor plant is stopped, and after this operation is stopped, the lid body 21 is removed from the cylindrical body 20 by operating the attachment means such as the mounting bolts 24. , the equipment loading/unloading ports 16, 16 of the reactor containment vessel 12 are opened. In this case, since the two equipment loading/unloading ports 16, 16 are arranged independently in the circumferential direction in the reactor containment vessel 12, mutually independent equipment loading/unloading routes can be obtained, and one equipment loading/unloading route For example, by forming one for carrying in and the other for carrying out independently, the work of carrying in and out of the reactor containment vessel 12 can be carried out smoothly and efficiently. This allows fuel replacement work and periodic inspection work to be carried out smoothly and in a short time.

When the loading/unloading work of various reactor equipment is completed, the equipment loading/unloading entrance 16 of the reactor containment vessel 12 is closed to the lid 21.
The reactor containment vessel boundary is then closed again in preparation for restarting the reactor plant.

As described above, in the nuclear reactor facility according to the present invention, a plurality of equipment loading/unloading entrances are formed in the side wall of the reactor containment vessel and at positions corresponding to the operation floor surface of the reactor building, and each equipment loading/unloading entrance Since it is removably closed with a sealable lid, it forms the reactor containment vessel boundary during reactor operation, while also being used for equipment removal during refueling work and periodic inspection of reactor equipment when the reactor is shut down. By removing the lid, the loading and handling work can be carried out smoothly and effectively in a short time through each equipment loading/unloading entrance, and the operating efficiency of the nuclear reactor plant can be improved.

In addition, during the construction of a nuclear reactor plant, the equipment entrances and exits of the reactor containment vessel can be used as transport routes for construction materials and reactor equipment, so there is no need to create temporary entrances, and during the construction period of the reactor plant. It is possible to shorten the construction period and reduce construction costs.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a nuclear reactor facility according to the present invention, FIG. 2 is a sectional view taken along the - line in FIG. 1, and FIG. 3 is an enlarged view of section B of the nuclear reactor facility shown in FIG. 2. It is a diagram. 10... Nuclear reactor facility, 11... Basic mats, 1
2...Reactor containment vessel, 13...Reactor building, 1
6...Equipment carry-in/out entrance, 18...Equipment carry-in/out entrance, 2
0... Cylindrical body, 21... Lid, 22, 23... Flange, 25... Sealing member.

Claims (1)

[Scope of Claims] 1. In a nuclear reactor facility in which a reactor building having a reactor pressure vessel is housed in a reactor containment vessel, and the top surface of this reactor building is used as an operation floor, the above-mentioned reactor containment vessel A plurality of equipment transport entrances are formed in the side wall of the building and at positions corresponding to the operation floor surface, and these equipment transport entrances communicate the transport passageway opened to the outside of the building with the inside of the reactor containment vessel. A nuclear reactor facility characterized in that each equipment loading/unloading port is removably closed with a sealable lid. 2. The nuclear reactor facility according to claim 1, wherein each equipment loading/unloading port is formed independently in the side wall of the reactor containment vessel so as to be spaced apart from each other in the circumferential direction. 3. According to claim 1, each equipment loading/unloading port is formed by a cylindrical body fixed to the side wall of the reactor containment vessel by welding or the like, and a lid body is removably attached to one end of the cylindrical body. Nuclear reactor facility listed.