JPS58155386A - Reactor pressure vessel pedestal - 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] [Technical Field of the Invention] The present invention relates to a reactor pressure vessel pedestal, and in particular, to a reactor pressure vessel pedestal that is designed to shorten the manufacturing process and improve construction safety. do.

[Technical Background of the Invention] Fig. 1 shows a conventional boiling water nuclear reactor, and in the figure, reference numeral 1 indicates a reactor containment vessel housed within a reactor building [12]. This reactor containment vessel 1 is divided into two by a diaphragm floor 3 into a dry well 4 and a wet well 5, and the base concrete Matsutoro that forms the bottom of the wet well 5 has an upper part arranged inside the dry well 4. A furnace f1h container pedestal 7 is erected. Inside the dry well is this reactor pressure vessel pedestal 7.
A reactor pressure vessel 8 mounted and supported thereon is accommodated, which is surrounded by a reactor shield 19 which rests on the reactor pressure vessel pedestal 7 . Further, a large number of vent pipes 10 are installed in the diaphragm floor 3 toward the wet well 5.

In a boiling water reactor configured in this way, the reactor pressure vessel pedestal 7 supports important and heavy objects such as the reactor pressure vessel 8, so it is made of reinforced concrete with a very large amount of reinforcing steel, and all of it is constructed on-site. Equipped with work.

However, the completion of the reactor pressure vessel pedestal 7 is a necessary condition for installing the diaphragm floor 3, and the installation of the diaphragm floor 3 is also a necessary condition for the on-site installation of the upper part of the reactor containment vessel 1.

In addition, after the reactor pressure vessel pedestal 7 is completed, the reactor shielding wall 9, the reactor pressure vessel 1, and the structures and piping inside the reactor containment vessel 1 will be installed. The shortening of the process for installing the pressure vessel pedestal 7 is an important element for shortening the power plant construction process.

Therefore, in order to shorten the installation process of the reactor pressure vessel pedestal 7, for example, the main structure of the reactor pressure vessel pedestal 7 is made of steel, eliminating the reinforcing steel assembly work that was conventionally done on site. In addition, the steel parts are produced in parts at a factory and then assembled on-site by welding.

However, this welding work is mainly performed in the closed space constituted by the reactor pressure vessel pedestal 7, and therefore a considerable amount of time is consumed in this welding work, which is not desirable in terms of safety management of the workers.

[Object of the invention] The present invention has been made in response to such conventional circumstances,
The objective is to provide a reactor pressure vessel pedestal that can shorten the construction period and improve worker safety.

[Summary of the Invention] That is, the present invention provides a reactor pressure vessel pedestal comprising a plurality of concentric cylindrical steel plates and a flat plate reinforcing the cylindrical steel plates, in which the cylindrical steel plates are bolted to each other via a joining member. This is a reactor pressure vessel pedestal that is characterized by:

[Embodiment of the Invention] The details of the present invention will be described below with reference to an embodiment shown in the drawings.

FIG. 2 shows a reactor pressure vessel pedestal according to an embodiment of the present invention, and in the figure, reference numeral 11 indicates the reactor pressure vessel pedestal. This reactor pressure vessel pedestal 11 is composed of four cylindrical steel plates a1b and c1d, and is erected on supports 13 of a foundation concrete mat 12. And this reactor pressure vessel pedestal 11
The reactor pressure vessel pedestal 1 is composed of an inner cylinder 14 that forms an inner wall, and an outer cylinder 15 that surrounds the inner cylinder 14 at regular intervals.
A vertical rib 16 made of a flat plate is inserted to reinforce the structure 1.

That is, each of the cylindrical steel plates a, b1c, and d has an annular shape obtained by cutting the reactor pressure vessel pedestal 11 perpendicularly to the axis, and the base concrete mat 12
A cylindrical steel plate a is placed on top of the cylindrical steel plate a, a cylindrical steel plate C is placed on this cylindrical steel plate, and a cylindrical steel plate d is placed on top of this cylindrical steel plate C. are listed in order.

The cylindrical steel plate a has a reactor pressure vessel pedestal 11.
A reinforcing member 18 is installed on the top of the cylindrical steel plate. Four through holes 19 are bored in each side of the cylindrical steel plates a and b.

The respective cylindrical steel plates a, b, c, and d are joined as shown in FIG. That is, in FIG. 3, reference numeral 16 indicates a vertical rib 16 inserted between the inner cylinder 1114 and the outer cylinder 15, and the vertical ribs 116 are in contact with each other at their upper and lower ends. and vertical rib 16
are located in the same vertical plane. The vertical ribs 16 are bolted together by a joining member 20, as shown in FIG.

That is, in FIG. 4, the reference numeral 20 indicates a joining member, and this joining member 20 straddles the vertical rib 16 and
6 is in contact with this vertical rib 16 from both sides. A large number of through holes 21 are bored through the joining member 20, the vertical rib 16, and the joining member 20, and bolts 22 are inserted into the through holes 21 with their tips protruding. bolt 2
A nut 23 is screwed into the screw formed at the tip of 2,
The joint portion 4120 is fastened to the vertical rib 16.

Note that the abutting portions 24 between the inner tubes 14 and the abutting portions 25 between the outer tubes 15 and the outer tubes 15 of the cylindrical steel plates a, b1c, and d are relatively easy to weld, so weld them as shown in Fig. 3. are welded together.

In the reactor pressure vessel pedestal configured as described above, the vertical ribs 16 are joined in a closed space surrounded by the inner cylinder 14 and the outer cylinder 15, but this work is performed in the through hole 2.
Since it is only necessary to insert the bolt 22 into the bolt 1 and tighten it with the nut 23 from the opposite side, workability and safety are greatly improved compared to conventional welding.

[Effects of the Invention] As described above, according to the reactor pressure vessel pedestal of the present invention, the construction period of the reactor pressure vessel pedestal can be significantly shortened, and the safety of workers can be improved. I can do it.

In addition, in the embodiment described above, an example was described in which the contact parts 24 and 25 of the inner cylinder 14 and the outer cylinder 15 of the cylindrical steel plates a and b1cSd were joined by welding. Of course, bolted connection may also be used.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a conventional boiling water reactor, FIG. 2 is a longitudinal sectional view showing a reactor pressure vessel pedestal according to an embodiment of the present invention, and FIG. FIG. 4 is a vertical sectional view taken along the line IV--IV in FIG. 3, showing details. 11......Reactor pressure vessel pedestal 20......Joint member 22...
・・・・・・Bolts a, blc, d・・・・・・・・・Cylindrical steel plate representative Patent attorney Sa Suyama - Figure 1 Figure 2 Figure 3 Figure 16 Figure 4

Claims (1)

[Claims] (1) A reactor pressure vessel pedestal consisting of a plurality of concentric cylindrical steel plates and a flat plate reinforcing the same, characterized in that the cylindrical steel plates are bolted to each other via a joining member. Reactor pressure vessel pedestal.