JPS588757B2 - Reactor vessel support device - Google Patents

Description

[Detailed description of the invention] This invention relates to a support structure for a nuclear reactor vessel.

The support structure of the reactor vessel is subjected to the reactor vessel's own weight, thermal reaction force from the primary coolant pipe, earthquake load, load from a pipe rupture accident, etc., and these loads are reliably and evenly absorbed by the primary shielding concrete. It is desirable that the information be communicated to the public.

As shown in FIGS. 1 and 2, a conventional reactor vessel support structure includes a plurality of reactor vessel support structures 2 that directly support a reactor vessel 1 and are located independently. The support structures 2 are each directly installed on the primary shielding concrete 4 by anchor bolts 3, and are attached to the reactor vessel 1.
The horizontal load from the reactor vessel is transmitted to the primary shielding concrete 4 through the shear keys 5 and anchor bolts 3 attached to the reactor vessel support structure, and the vertical load from the reactor vessel 1 is is transmitted from the lower surface of the reactor vessel support structure 2 to the primary shielding concrete 4.

The support structure of such a reactor vessel requires strict precision when assembling and installing it, so a part of the primary shielding concrete is made into a box-out part 6, and after level adjustment with level adjustment bolts, grouting is performed. Since the installation is being carried out at a facility, it is inevitable that a considerable amount of time will be spent on the installation.

Furthermore, regarding the load transfer from the reactor vessel support structure to the primary shielding concrete, as mentioned above, the conventional reactor vessel support structure has a structure that transmits the load locally to the concrete, so the strength of the primary shielding concrete is limited. However, it is locally severe and a large number of reinforcing bars are required to compensate for this.In addition, the primary shielding concrete directly under the reactor vessel support structure has a box lining to protect the in-core instrumentation detectors. However, the space is small, and reinforcing work is time-consuming, which consumes a large amount of time during the construction process.

This invention was made in view of the above-mentioned circumstances, and is capable of transmitting the dead weight and other loads of the reactor vessel to the entire primary shielding concrete, and also enables on-site installation work of the reactor vessel support structure. It is an object of the present invention to provide a reactor vessel support device that makes it possible to shorten the construction process of a nuclear power plant, such as by shortening the reinforcement work by reducing the amount of reinforcing bars in the primary shielding concrete directly under the reactor vessel support structure. This is the purpose.

Corresponding to this object, the reactor vessel support device of the present invention includes at least a plurality of reactor vessel support structures, and a plurality of reactor vessel support structures that are fixedly attached to the reactor vessel support structures to integrate the plurality of reactor vessel support structures. a connecting block that is connected in a ring shape; a top plate that fixes and supports the reactor vessel support structure and the connecting block on its upper surface and is supported on the primary shielding concrete; and a side plate that is fixed and supported by the primary shielding concrete.

The details of this invention will be explained below with reference to the drawings showing one embodiment.

In FIGS. 3, 4, and 5, 1 is a reactor vessel, and the reactor vessel 1 is supported by a primary shielding concrete 14 via a reactor vessel support device 10.

The reactor vessel support device 10 includes a plurality of reactor vessel support structures 12 , and a connecting block 17 is located between adjacent reactor vessel support structures 12 . The block 17 is fixedly welded to the reactor vessel support structure 1.
2 and a plurality of connecting blocks 17 are formed into an integral ring shape.

The reactor vessel support structure 12 and the connecting block 17, which are integrally fixed, are fixed on the upper surface of the top plate 18 around the center hole 19 by welding or the like.

The top plate 1B has a circular central hole 19 in the center, and has a polygonal peripheral edge formed into an approximately ring plate shape, and is placed on the upper surface of the shoulder of the primary shielding concrete 14. be.

A side plate 21 located approximately perpendicular to the top plate 18 is fixed to the peripheral edge of the top plate 18 by welding or the like, and straddles the side plate 21 and the top plate 18 to prevent bending buckling of the top plate 18. A plurality of reinforcing ribs 20a, 20b,
20C and 20d are fixedly arranged by welding or the like.

Further, a plurality of stud bolts 22 are welded and fixed to the outer surface of the side plate 21, and when the stud bolts 22 are embedded in the primary shielding concrete 14, the side plate 21 is fixed to the primary shielding concrete 14.
It is firmly supported on the side of the shoulder part of 4.

As described above, in the reactor vessel support device 10 of the present invention, the reactor vessel support structure 12 is integrated via the connecting block 17, and the top plate 1
8 and the side plate 21.

Therefore, horizontal loads from the reactor vessel 1 are transferred from the reactor vessel support structure 12 and/or connecting blocks 17 to the top plate 18 and further via the side plates 21 and stud bolts 22 to the primary shielding concrete 14. and also the reactor vessel 1
The vertical load from the reactor vessel support structure 12 is applied to the primary shielding concrete 14 via the top plate 1B.
or from the top plate 18 to the primary shielding concrete 14 via the side plates 21 and stud bolts 22. In either case, the load from the reactor vessel 1 is distributed evenly over the entire primary shielding concrete 14. communicated.

Therefore, compared to the conventional reactor vessel support device that transmits the load locally to the primary shielding concrete, the reactor vessel support device of the present invention is very advantageous in terms of the strength of the primary shielding concrete. By reducing the amount of reinforcing bars in the local area of the primary shielding concrete directly under the reactor vessel support structure, which has space constraints,
This can make reinforcing work more advantageous.

Moreover, in the reactor vessel support device of the present invention, since the reactor vessel support structure and the component corresponding to the embedded hardware are integrated, it can be manufactured in a factory.
The on-site work required for installing the reactor vessel support structure can be significantly shortened, which is extremely advantageous in terms of the construction process of a nuclear power plant.

[Brief explanation of the drawing]

FIG. 1 is an explanatory longitudinal cross-sectional view showing a conventional reactor vessel support device, FIG. 2 is an explanatory cross-sectional view taken along the line ■-■ in FIG. 1, and FIG. FIG. 4 is a longitudinal cross-sectional explanatory view showing the support device, FIG. 4 is a cross-sectional view of the TV-IV section in FIG. 3, and FIG. 5 is a partial perspective view of the support device for the reactor vessel shown in FIG. 3. 1...Reactor vessel, 10...Reactor vessel support device, 12
... Reactor vessel support structure, 14 ... Primary shielding concrete, 17 ... Connecting block, 18 ... Top plate, 20a, b, c, d ... Reinforcement rib, 21 ...
...Side plate, 22... Stud bolt.

Claims (1)

[Scope of Claims] 1. At least a plurality of reactor vessel support structures, and a connection that is fixed to the reactor vessel support structures and integrally connects the plurality of reactor vessel support structures in a ring shape. A block and the above atoms on the top surface. a top plate that firmly supports the furnace vessel support structure and the connecting block and is supported on primary shielding concrete;
and a side plate fixed to the outer periphery of the top plate and supported by primary shielding concrete. 2. A supporting device for a nuclear reactor vessel according to claim 1, wherein the top plate is provided with reinforcing ribs for reinforcing the top plate. 3. A support device for a nuclear reactor vessel according to item 1 or 2.