JPS59187290A - Fixing structure of reactor pressure container - 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 an installation structure for a nuclear reactor pressure vessel.

[Background of the invention]

FIG. 1 is an explanatory diagram of the internal structure of the reactor containment vessel, 1
is the reactor containment vessel, 2 is the pressure vessel pedestal built inside the containment vessel 1, 3 is the reactor pressure vessel installed and fixed on the pedestal 2, and the pedestal 2 supports the pressure vessel 3 in an earthquake-resistant manner. It is an important construct.

In FIG. 2 showing an enlarged view of part A in FIG. 1, the pedestal 2 on which the pressure vessel 3 is installed and fixed has cylindrical steel plates 2a and 2b arranged inside and outside, and vertically between the inside and outside cylindrical steel plates 2a and 2b. Ribs (not shown) are connected to each other, and concrete 4 is placed between the steel plates 2a and 2b.

Furthermore, the reactor pressure vessel 3 and pressure vessel pedestal 2 are
Pressure vessel support skirt 5 provided at the bottom of the pressure vessel 3
and a bearing plate 6 via bolts.

Figure 3 shows an example of the installation structure of a conventional reactor pressure vessel.
It is an enlarged view of part B in the figure. In FIG. 3, 2C is a pedestal top plate located at the top of the pressure vessel pedestal 2, 2d is a lower plate located at the bottom of the pedestal top plate 2C, 7 is a foundation bolt with a long shank portion,
8 to 10 represent nuts. As is clear from FIG. 3, the bearing plate 6 is placed on the pedestal top plate 2C, on which the pressure vessel support skirt 5 is located, and the pressure vessel support skirt 5, The bearing plate 6 and the pedestal top grate 2C1 lower plate 2d are integrally connected via bolts 7 and nuts 8 to 10. Here, a specific procedure for installing a conventional nuclear reactor pressure vessel will be explained based on FIG. 3 while referring to FIGS. 1 and 2.

Prior to the installation of the reactor pressure vessel 3, the pressure vessel pedestal 2 is first raised;
The inner and outer cylindrical steel plates 2a and 2b shown in the figure are sequentially welded from below and erected. Next, move the pressure vessel 3 to the pedestal 2.
To install and fix the pedestal on the top, insert the bolt 7 into the bolt mounting hole of the pedestal top plate 2C and the bolt mounting hole of the lower plate 12d, and tighten and fix the bolt 7 to the lower plate 2d via the nuts 9 and 10. . After placing the bearing plate 6 on the pedestal top plate 2C, the pressure vessel 3 is suspended into the reactor containment vessel 1 shown in FIG. 1, and the pressure vessel support skirt 5 is positioned on the bearing plate 6. By tightening and fixing the nut 8 to the bolt 7, the pressure vessel 3 and the pedestal 2 are integrated.

Although the conventional reactor containment vessel installation structure and its specific installation procedure have been described above, this conventional example has the following operational inconveniences and drawbacks.

(1) Since the base bolt 7 that tightens and fixes the pressure vessel support skirt 5 needs to pass through between the pedestal top plate 2c and the bottom plate 2d, the shank portion of the bolt 7 must be long. Moreover, since a large number of the above-mentioned bolts 7 are arranged in the circumferential direction of the pressure vessel support skirt 5, material costs and processing costs increase. Furthermore, centering of long bolts is not easy.

(2) Pedestal top plate 2c and bottom plate 2d
The pedestal top plate 2C and bottom plate 2d are made of thick material in consideration of load capacity.
Since the two are far apart, it is not easy to center the bolt mounting holes between the two. In addition, since the bolt mounting holes described above need to be provided facing each other in the circumferential direction of the pedestal top plate 2c and the lower plate 2d, the number of bolt mounting holes is large, and the drilling operation itself is not easy.

In order to improve the above-mentioned operational inconveniences and drawbacks, a structure shown in FIG. 4 has been previously proposed. As is clear from the figure, in this improved structure,
The shank portion of the foundation bolt 7 is made short so that the bolt 7 is firmly fixed to the pedestal top plate 2c. According to this structure, since the shank portion of the bolt 7 is short, its centering Not only is the machining easier, but since bolt mounting holes are not required in the circumferential direction of the lower plate 2d, the drilling work itself is greatly simplified.

However, what can be said in common with the conventional examples shown in FIGS. 3 and 4 is that the reactor pressure vessel 3 is suspended into the reactor containment vessel 1 and placed on the pressure vessel pedestal 2. While adjusting the positions, the nuts attached to the foundation bolt 7 (numbers 8 to 10 in Figure 3, and numbers 8 and 9 in Figure 4) rotate and loosen. This means that there is a risk that this may occur. Therefore, between the pedestal top play) 2c and the lower grate 2d, there is a conc.
, 1-) Even after pouring 11, the nuts protruding from the outside (in the case of Fig. 3, numbers 8 and 10, and 4th
In the case of the figure, it is possible to retighten as shown in item 8), but conc!
After casting J-1-11, it is impossible to retighten the nut 9 located between the pedestal top plate 2 ridge and the lower play h2d.
The work of placing concrete 11 to be filled between c and lower plate 2d is carried out by fixing the pressure vessel 3 in the correct position,
This is done after the bolts 9 have been retightened. In this way, conventionally, the work of pouring concrete 11 between the pedestal top plate 2c and the lower plate 2d could only be done after the pressure vessel 3 was installed and fixed on the pedestal 2. It goes without saying that related work following concreting can only be carried out after the pressure vessel 3 has been installed on the pedestal 2.

[Purpose of the invention]

The present invention has been made focusing on the above points, and includes:
The purpose of this is to allow concrete to be placed between the pedestal top plate and the bottom plate even before the reactor pressure vessel is installed and fixed on the pressure vessel pedestal. The present invention aims to provide an improved installation structure for a nuclear reactor pressure vessel, which allows related work following the hammering to proceed regardless of the lifting of the pressure vessel, thereby shortening the construction period of a nuclear reactor facility. It is.

[Summary of the invention]

In order to achieve the above object, the present invention provides a nuclear reactor pressure vessel in which a reactor pressure vessel and a pressure vessel pedestal are bolted together via a pressure vessel support skirt and a bearing plate provided at the lower part of the pressure vessel. In the installation structure, a foundation bolt is inserted from the bottom surface of the top plate located at the top of the pedestal, the bolt head of the foundation bolt and the bolt holder are tightened and fixed by this foundation, and the bolt holder is attached to the bottom surface of the pedestal top plate. The pressure vessel and pedestal are constructed integrally by setting the bearing plate and the pressure vessel support skirt on the shank part of the foundation bolt that has been welded, positioned and fixed as described above, and tightening both with nuts. It is characterized by It is something.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail based on FIGS. 5 to 7. FIG. 5 is a vertical sectional view of the main part showing one embodiment of the present invention, and FIG. 6 is a section C in FIG. Enlarged view, Figure 7 is 6
This is an enlarged sectional view taken along the line DD in the figure, and the same parts as those in the conventional example shown in FIG. 4 are given the same reference numerals. As clearly shown in FIGS. 6 and 7, a holder head 7a of the foundation bolt 7 inserted from the underside of the pedestal top plate 2C is fitted with a holder holder 12. A small bolt 13 is attached to the .

The small bolt 13 described above is screwed into the bolt head 7a of the foundation bolt 7, and tightens and fixes the bolt head 7a and the bolt holder 12. In this state, the bolt holder 12 is It is welded to the lower surface of the pedestal top plate 2c. On the other hand, a bearing plate 6 and a pressure vessel support skirt 5 are set on the shank portion of the bolt 7, which is positioned and fixed as described above. By tightening the reactor pressure vessel 3 and pressure vessel pedestal 2,
are integrally constructed.

The installation structure of the reactor pressure vessel according to the present invention is as described above.Next, the installation procedure of the structure shown in the illustrated embodiment will be explained. First, the bearing plate 6 is installed on the pedestal top plate 2C, and the foundation bolt 7 is inserted from the lower surface of the pedestal top plate 2c. Next, as shown in FIG. 6, the bolt installation jig 14 is inserted from above the base bolt 7, and its tip is fitted into the hole of the bearing plate 6. Then, the nut 8 is screwed into the bolt 7, and the bolt 7 is temporarily fixed in an immovable state. Once the bolt 7 is temporarily fixed in an immovable state, the bolt holder 12 is fitted to the bolt head 7a of this bolt 7, and the small bolt 13 is screwed into the screw hole of the bolt head 7a.
The bolt holder 12 is kept stationary and in this state the bolt holder 12 is welded to the lower surface of the pedestal top plate 2C. In addition, during the above-mentioned work, the work of positioning the bolts 7, bolt holders 12, etc. on the lower surface of the pedestal top plate 2C is done through the holes 1 provided in the lower plate 2d.
You can do this using 5.

After the bolt holder 12 is welded to the lower surface of the pedestal top plate 2C in this way, the lower plate 2d
The hole 15 of the inner cylindrical steel plate 2 is closed with a steel plate (not shown).
Conc IJ-) 11 is cast through holes 16 and 17 drilled in a and the pedestal top plate 2C. Thereafter, the nut 8 and bolt mounting jig 14 are removed, the flange 5a of the pressure vessel support skirt 5 is set on the shank of the bolt 7, and the nut 8 is tightened again. It is constructed integrally with the pressure vessel pedestal 2. In the present invention, after the concrete IJ-) 11 is cast and the nut 8 and bolt mounting jig 14 are removed, as shown in FIG.
If a solidifying agent 18 such as an epoxy resin is filled between the bolt mounting hole of the pedestal top plate 2C and the foundation bolt 7 inserted therein, the foundation bolt 7 can be fixed in an upright manner more completely.

[Effects of the Invention] As described in detail above, the present invention includes fitting the bolt holder 12 into the bolt head 7a of the foundation bolt 7 inserted from the lower surface of the pedestal top plate 2C, and attaching the bolt holder 12 to the bolt holder 12. The bolt head 7a of the foundation bolt 7 and the bolt holder 12 are connected by the small bolt 13.
are tightened and fixed, and the bolt holder 12 is welded to the lower surface of the pedestal top plate 2C.
The foundation bolts 7 for installing and fixing the reactor pressure vessel 3 to the pressure vessel pedestal 2 are already firmly erected in an immovable state before the concrete 11 is placed between the pedestal top plate 2C and the bottom plate 2d. has been done. Therefore, according to the present invention having the above configuration, the pressure vessel 3
Concrete 11 can be poured between the pedestal top plate 2C and the bottom plate 2d even before the pressure vessel 3 is installed and fixed on the pedestal 2. It is possible to obtain an improved installation structure for a reactor pressure vessel, which can be proceeded with regardless of the suspension of the reactor, and which can shorten the construction period of a nuclear reactor facility.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the internal structure of the reactor containment vessel, Figure 2 is an enlarged view of part A of Figure 1, and Figure 3 is an enlarged view of part B of Figure 2 showing an example of the installation structure of a conventional reactor pressure vessel. 4 is an enlarged view of part B in FIG. 2 showing an example of the installation structure of a reactor pressure vessel different from that in FIG. 3, and FIG. 5 is a vertical cross-sectional view of essential parts showing an embodiment of the present invention. , FIG. 6 is an enlarged view of section C in FIG. 5, and FIG. 7 is an enlarged sectional view taken along line D--D in FIG.

Claims (1)

[Claims] 1. Installation of a reactor pressure vessel in which the reactor pressure vessel and the pressure vessel pedestal are connected via a pressure vessel support skirt and a bearing plate provided at the bottom of the pressure vessel. In the structure, a foundation bolt is inserted from the underside of the top plate located at the top of the pedestal, a bolt holder is fitted into the bolt head of this foundation bolt, a small bolt is installed in the bolt holder, and this small bolt The bolt head of the foundation bolt and the bolt holder are tightened and fixed, and the bolt holder is welded to the lower surface of the pedestal top plate, and the bearing plate and pressure vessel support skirt are attached to the shank of the foundation bolt positioned and fixed as described above. An installation structure for a nuclear reactor pressure vessel, characterized in that the pressure vessel and the pedestal are integrally configured by setting the pressure vessel and the pedestal and tightening both with nuts. 2. In the invention as set forth in claim 1, the installation structure of a nuclear reactor pressure vessel, in which a solidifying agent is filled between the bolt mounting hole of the pedestal top plate and the foundation bolt inserted therein.