RU2360309C1 - Nuclear reactor attachment point - Google Patents

Abstract

FIELD: power engineering. ^ SUBSTANCE: invention refers to nuclear engineering and namely to nuclear power stations with shell-type reactors, and deals with fixing a nuclear reactor shell in the vault. Nuclear reactor shell attachment point consists of a support ring, keys, hold-down straps and pins. A base ring is located on the support truss of reactor vault and connected to the support truss. On that ring there coaxially located is the support ring. There is a flange in the lower part of the latter. Flange overlaps the base ring along outside diametre and across the height. In the base and support rings the slots are made from inside diametre. In those slots there located are wedges with through threaded holes. Lower plane of wedges is sloped in the direction of the hole made in the support truss under reactor shell, and upper plane thereof interacts with the support ring and is horizontal and parallel to the support truss plane. In the support ring there made are through holes in the slots for wedges. Adjusting bolts are passed through those holes and screwed in threaded holes of wedges. ^ EFFECT: simplifying design of nuclear reactor attachment point and improving attachment reliability of nuclear reactor. ^ 3 cl, 6 dwg

Description

The invention relates to the field of nuclear energy, in particular to nuclear power plants with shell reactors, and for securing a nuclear reactor shell in a mine.

The main requirements for nuclear reactor fusion devices used in nuclear energy are:

- the reliability of fastening a nuclear reactor to a support farm, providing strength and rigidity when exposed to external forces from the supply and exhaust coolant pipelines that occur during operation of the nuclear power plant, as well as during seismic influences;

- reduction of costs for the manufacture and installation of the mounting unit of the reactor vessel;

- reducing the installation time of the attachment of the reactor vessel.

The known design of the attachment site for the nuclear reactor of the shell type used at Russian-made nuclear power plants, consisting of racks welded to the support truss of the concrete shaft of the nuclear reactor, support ring, dowels, clamping bars and studs.

The mounting device of the nuclear reactor vessel of known design is mounted as follows.

On the support farm of the reactor shaft around the perimeter of the hole for placing the reactor, racks are installed, which are fixed on the support farm by welding. On the racks at the level of the upper surface of the support ring holes are made for placement of wedge clips in them.

In the inner space formed by the uprights, a support ring is placed which is mounted on wedges, with the help of which its strictly horizontal arrangement is ensured.

In the support ring along the outer and inner perimeter of the grooves are made.

In the grooves along the outer perimeter of the support ring are placed previously installed racks.

In the grooves along the inner perimeter of the support ring are dowels that interact with the grooves in the support collar of the reactor vessel mounted on the support ring.

The support ring is placed on several pairs of regulatory wedges, providing a strictly horizontal position. After installing the support ring in a horizontal position, the control wedges are fixed by welding between each other and with the support truss, and the support ring is fixed with fixing wedges on the racks. To prevent loosening of the support ring, the fixing wedges are welded to the uprights.

After installation on the support ring of the nuclear reactor vessel, the latter is secured by clamping strips placed on the upper surface of the support collar of the reactor vessel, using studs passing through the dowels, to the support ring of the attachment unit and the studs to the dowels.

The disadvantage of this design is the reliability of the support ring associated with a large number of additional links, namely, that the support ring is mounted on the support truss of the reactor shaft not directly, but through the additional links, which are the racks.

In addition, a large number of racks and wedges complicates the process of mounting the reactor vessel, namely the process of regulating its horizontal location.

The technical result of the invention is to simplify the design of the attachment site of a nuclear reactor while improving the reliability of the fastening of a nuclear reactor.

The technical result is achieved due to the fact that:

- the attachment site of the nuclear reactor vessel contains a support ring, dowels, clamping strips and studs;

- on the support truss of the reactor shaft, it is placed and connected to the support truss by welding or by any other method providing reliable connection with the support truss, a base ring on which the support ring is coaxially placed, having a flange in its lower part that overlaps the outer diameter, height, base ring, and in the base and support rings from the side of the inner diameter, grooves are made in which wedges are placed in which through threaded holes are made, the lower plane of the wedge Nev has a bias towards the hole in the support truss under the reactor vessel, and the upper plane interacting with the support ring is horizontal and parallel to the plane of the support truss, and in the support ring, through holes are made in the grooves of the wedges through which control bolts are screwed into the threaded holes wedge holes;

- the wedges and the adjusting bolt are fixed by welding;

- clamping strips placed on the support collar of the reactor vessel are fixed with studs to the base ring in which the threaded holes are made.

The essence of the invention is illustrated by drawings, where:

figure 1 - shows the mounting unit of the nuclear reactor in the plan;

figure 2 - shows the remote element A;

figure 3 - shows a section bB of the mount on the wedges;

figure 4 - shows a section bb of the attachment point on the clamping studs;

figure 5 - shows a view of the G from the inside of the mount;

figure 6 - shows a view of D (view of the key).

The proposed design of the attachment unit of the nuclear reactor vessel of the present invention consists of a base ring 1, a support ring 2, wedges 3, adjusting bolts 4, locking keys 5, pressure bars 6, studs 7, nuts 8.

The mounting unit of the nuclear reactor shell works as follows.

A base ring is mounted on the support truss of the reactor shaft, which is fastened to the support truss by welding or by any other method providing a reliable connection to the support truss. (The drawings show the connection of the base ring with the support truss by welding.) A support ring with wedges installed in it is mounted on the base ring, and the placement of the wedges must be consistent with the grooves in the base ring.

Then, with the help of adjusting bolts, by moving the wedges in the grooves of the base and support rings, the support ring is set horizontally and secured with studs screwed into the base ring, fixing its position. Then, using welding, the wedges are fixed relative to the base and support rings and the adjusting bolts relative to the wedges. The same wedges prevent rotation and movement in the horizontal plane of the support ring relative to the base.

The presence of a flanging on the support ring in its lower part, overlapping the outer diameter of the base ring, also prevents the movement of the nuclear reactor during operation when external forces are applied to it, such as forces from thermal expansion of the supply and exhaust pipes, seismic effects.

Next, a reactor vessel equipped with a support collar is mounted on the support ring, and grooves are made in the support collar of the reactor vessel and the support ring of the nuclear reactor vessel fastening device to accommodate keys to prevent the rotation of the nuclear reactor vessel relative to the vertical axis.

On top of the keys and the support collar of the reactor vessel, clamping strips are installed that secure the reactor vessel, the keys and the support ring on the base ring, which excludes the movement of the reactor vessel in the vertical direction.

The mutual arrangement of the base and support rings, wedges, as well as the placement of threaded holes for securing the reactor, is provided at the manufacturer of the mount.

The design of the attachment unit of the reactor vessel according to this invention allows to simplify the process of adjusting the position of the support ring, reduces the number of relationships between the elements of the device compared to the prototype, which increases the reliability of the design.

Setting (regulating) the position of the support ring through the use of wedges moved with bolts, with their subsequent fixation by welding, simplifies the installation of the reactor vessel mounting unit and reduces labor costs during its installation.

Claims (3)

1. The attachment site of the nuclear reactor vessel, containing the support ring, dowels, clamping strips and studs, characterized in that on the support farm of the reactor shaft is placed and connected to the support farm by welding or in some other way, providing a reliable connection with the support farm , a base ring, on which a support ring is coaxially placed, having a flange in its lower part that overlaps the outer ring, the base ring in height, moreover, in the base and support rings from the inner diam The grooves are made in which wedges are placed in which through threaded holes are made, the lower plane of the wedges sloping toward the holes in the support truss under the reactor vessel, and the upper plane interacting with the support ring is horizontal and parallel to the plane of the support truss, through holes in the support ring in the grooves for the wedges, through which pass the adjusting bolts screwed into the threaded holes of the wedges. 2. The attachment site of the nuclear reactor vessel according to claim 1, characterized in that the wedges and control bolt are fixed by welding. 3. The attachment site of the nuclear reactor vessel according to claims 1 and 2, characterized in that the clamping strips placed on the support collar of the reactor vessel are fixed with studs to the base ring in which the threaded holes are made.

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