JPS61196197A - Anchor structure of container for nuclear reactor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a nuclear reactor containment vessel, and in particular, to a bottom part of a containment vessel suitable for making the reinforcement of the bottom concrete under the bottom liner to the extent of crack prevention reinforcement. Regarding structure.

[Background of the invention]

Problems with the conventional anchor structure will be explained based on the following drawings.

As a known example closest to the present invention, for example, JP-A-54-1
There is a structure of a containment vessel described in Japanese Patent No. 24190. This structure will be explained based on FIG.

In Figure 6, 16 is a liner plate, 17 is a reinforced concrete containment vessel wall, 4 is a reactor pressure vessel pedestal, and 11 is a liner plate.
is matte concrete, 25 is a reactor pressure vessel pedestal anchor bolt, and 18 is a bottom liner.

In this structure, the liner plate 16 is lined with a reinforced concrete wall 17 and has an integral structure, and the bottom liner 18 is placed on the foundation mat 11, which has a higher level than in conventional reactor containment vessels. It is also lined with a one-piece structure. These liner plates 16 and bottom liner 18 form the containment boundary;
The pressure-resistant strength members are the reinforced concrete containment vessel walls 17 and the foundation mat 11 because they are much thinner than the steel plates that constitute conventional containment vessels and do not bear any load.

According to this structure, the containment vessel boundary, which conventionally used a steel plate with a thickness of about 30 mm, is much thinner, and since the bottom is a flat plate, the weight of the steel plate is reduced.

However, in this structure, since the base mat 11, which serves as a pressure-resistant strength member, is cast at a high place, the amount of reinforcing bars increases significantly and the process lengthens significantly.

[Purpose of the invention]

An object of the present invention is to provide an anchor structure for a reactor containment vessel in which the containment vessel boundary is the concrete surface of the bottom of a dry well, and does not require an increase in the construction process or the amount of materials compared to conventional reactor containment vessels. .

[Summary of the invention]

A feature of the present invention is that the upward load from the skirt, anchor bolts, and reactor pressure vessel pedestal is transmitted to the dry well bottom concrete to the areas that were conventionally made of matte concrete, without burdening the dry well bottom concrete. The reinforcing process for the bottom of the dry well was shortened by using reinforcement to prevent cracks.

The goal is to reduce the amount of material.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, 19 is the dry well bottom concrete, 20 is the boundary between the dry well bottom concrete and the foundation mat, 21 is the dry well skirt, and 22 is the lower part of the reactor pressure vessel pedestal outer cylinder.

23 is the lower part of the reactor pressure vessel pedestal inner cylinder, 24 is the containment vessel anchor bolt, 25 is the reactor pressure vessel pedestal inner cylinder anchor bolt, 26 is the reactor pressure vessel pedestal inner cylinder anchor bolt, and the others are shown in FIG. show.

In the present invention, a bottom liner 18 is placed on the upper surface of the dry well lower concrete 19, the bottom surface of the yK sub-reactor pressure vessel lower space 15, and the surface of the pit hole 6 shown in FIG. The portion covered with the bottom liner 18 and the reactor pressure vessel pedestal inner cylinder lower part 23 constitute a containment vessel boundary at the bottom of the containment vessel. The shell portion of the containment vessel other than the bottom of the containment vessel is conventionally made of a steel plate of approximately 30a++m, and a space is provided between it and the shield wall.

In addition, since upward loads caused by internal pressure loads and earthquake loads must be transferred to the mat concrete 11,
Dry well skirt 21. The lower ends of the reactor pressure vessel pedestal inner and outer cylinder lower parts 22 and 23 are set near the top of the boundary 20 between the bottom liner lower concrete and the foundation mat, and from here the respective anchor bolts 24, 25 and 26 are extended into the mat concrete 11. , transmits the aforementioned upward load to the foundation mat.

Incidentally, FIG. 5 shows a longitudinal section of the reactor containment vessel according to the present invention.

In FIG. 5, 2 is a reactor containment vessel, 4 is a reactor pressure vessel pedestal, and 18 is a bottom liner.

20 is the boundary between the concrete under the bottom liner and the matte concrete, and 21 is the dry well skirt.

22 and 23 indicate the lower part of the outer cylinder and the lower part of the inner cylinder of the reactor pressure vessel pedestal, and 24 to 26 indicate anchor bolts.

From the above, according to the present invention, the following effects can be obtained.

(1) Since the upward loads from the anchor bolts 22, 23, and 24 of the dry well and reactor pressure vessel pedestal are not transmitted to the dry well lower concrete but flow into the matte concrete 11, the amount of reinforcing bars in the dry well lower concrete 20 is as follows: Reinforcement to prevent cracks is sufficient. For this reason,
The amount of reinforcing bars can be significantly reduced compared to the reinforcement arrangement equivalent to matte concrete.

(2) If the bottom concrete is reinforced like matte concrete and the containment vessel is erected by setting anchors in the bottom concrete, construction of the containment vessel must begin after about three months have been spent pouring the bottom concrete. However, according to the anchor structure of the present invention, the containment vessel is erected regardless of the pouring of the bottom concrete, so the approximately three-month process for pouring the bottom concrete is not considered a critical path. The process can be shortened.

A modification of the present invention is shown in FIGS. 2, 3, and 4.

First, as shown in FIG. 2, the dry well skirt 21 is brought close to just in front of the bottom liner 18, and the lower part of the reactor pressure vessel pedestal outer cylinder 22 is also brought close to right in front of the bottom liner 18, and from there, each Anchor bolts 24,25 transmit upward loads caused by internal pressure loads and seismic loads into the mat concrete 11. In addition, the lower part 23 of the inner cylinder of the reactor pressure vessel pedestal is brought close to the bottom liner 18 under the upper space 15 of the reactor pressure vessel, and the anchor structure is such that the load is transmitted into the mat concrete 11 by the anchor bolts 26 as described above. .

Next, as shown in FIG. 3, the dry well skirt 21, the lower part of the outer cylinder of the reactor pressure vessel, and the lower part of the inner cylinder 22° 23 are brought close to just below the bottom liner under the upper space 15 of the reactor pressure vessel, and from there, each This is an anchor structure in which upward loads caused by internal pressure loads and earthquake loads are transmitted into the mat concrete 11 by the anchor bolts 24 to 26.

Finally, FIG. 4 shows the dry well skirt 21.
The lower end position of the reactor pressure vessel pedestal outer cylinder, internal lower part 22, 23 is the same as in Fig. 2, and is set immediately below the containment vessel boundary. The difference from Fig. 2 is that the anchor bolt structure for the dry well skirt 21 and the lower part of the reactor pressure vessel pedestal outer cylinder 22 is a two-stage or anchor frame structure, which transmits the load caused by internal pressure load and seismic load. It is something. Here, the anchor bolt structure of the lower part 23 of the inner cylinder of the reactor pressure vessel pedestal is the same as that shown in FIG.

As described above, according to the embodiments shown in FIGS. 2, 3, and 4, in addition to the above-mentioned effects, it is possible to reduce the steel plate of the containment vessel skirt 21 at the bottom of the containment vessel, thereby reducing weight and cost. I can do it.

〔Effect of the invention〕

According to the present invention, the load can be directly applied to the mat concrete without burdening the dry well bottom concrete with the upward load from the dry well and the reactor pressure vessel pedestal. Since the anchors are set in the matte concrete and the containment vessel can be erected regardless of the pouring of the bottom concrete, the amount of reinforcing bars can be reduced and the construction process can be shortened.

[Brief explanation of drawings]

FIG. 1 is a structural diagram of a bottom anchor of a reactor containment vessel showing an embodiment of the present invention, FIGS. 2, 3, and 4 are structural diagrams of a bottom anchor of a reactor containment vessel showing modified examples of the present invention, FIG. 5 is a longitudinal sectional view of a reactor containment vessel showing an embodiment of the present invention, and FIG. 6 is a longitudinal sectional view of a reactor containment vessel in a known example closest to the present invention. 1... Reactor pressure vessel, 2... Reactor containment vessel, 4...
...Reactor pressure vessel pedestal, 6...Pit hole, 1
DESCRIPTION OF SYMBOLS 1... Matt concrete, 15... Reactor pressure vessel upper space, 18... Bottom liner, 19... Bottom liner lower concrete, 20... Boundary between bottom liner lower concrete and mat concrete, 21 ...Dry well skirt, 22...Reactor pressure vessel pedestal outer cylinder lower part, 23...Reactor pressure vessel pedestal inner cylinder lower part, 24...Containment vessel anchor bolt, 25...Reactor pressure vessel Pedestal outer cylinder anchor bolt, 26... Reactor pressure vessel pedestal inner cylinder anchor bolt, 27... Anchor bolt.

Claims (1)

[Claims] 1. Consisting of a dry well containing a reactor pressure vessel and a pressure suppression chamber arranged in a torus around the dry well and communicating with the dry well via a vent, the concrete surface of the lower part of the dry well A step is provided between the bottom surface of the space under the reactor pressure vessel and the bottom surface of the space below the reactor pressure vessel, and these surfaces are used as the containment vessel boundary, and the vertical upward load applied to the dry well and the reactor pressure vessel is reduced by (1) the dry well skirt. A structure in which the bottom of the pressure vessel pedestal and the bottom of the pressure vessel pedestal are brought close to just before the matte concrete, and the load is transmitted using anchor bolts. (2) A structure in which the dry well skirt and the bottom of the pressure vessel pedestal extend directly below the bottom liner, and the anchor bolts are extended from here to the matte concrete to transmit the load. (3) A structure in which the dry well skirt and the bottom of the pressure vessel pedestal extend to just below the space below the pressure vessel pedestal, and from here the anchor bolt extends to the matte concrete to transmit the load. (4) A structure that transmits loads by combining the dry well skirt, pressure vessel pedestal, anchor bolt, and anchor frame. In the above structure, by transmitting the reinforcement to the mat concrete that is arranged to withstand the upward load, the load is not transmitted to the concrete between the mat concrete and the containment vessel boundary, and the reinforcement is arranged to the level of crack prevention reinforcement. An anchor structure for a reactor containment vessel characterized by: