JPS58103694A - Basic structure of reactor pressure vessel and its construction method - 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 The present invention relates to a basic structure of a nuclear reactor pressure vessel and a method of constructing the same.

Prior to explaining the present invention, the basic structure of a conventional nuclear reactor pressure vessel is shown in FIG. Further, FIG. 2 shows an enlarged view of part A in FIG. 1. In FIG. 1, a pedestal 1 supporting a pressure vessel 2 has a structure in which cylindrical steel plates la and lb are arranged inside and outside, and a vertical lip (not shown) is provided inside. In addition, the pedestal top steel plate I constituting the top of the pedestal 1
As shown in FIG. 2, C is integrally tightened and fixed to the pressure vessel support skirt 3 via a bearing plate 4, foundation bolts 5, and nuts 6. In the figure, 7 is an inner and outer cylindrical steel plate 1a that constitutes the pedestal 1.

Shows concrete layer grouted between lbs.

The basic structure of a conventional reactor pressure vessel is as described above. Conventionally, when constructing this foundation, a part of the pedestal top steel plate IC (the part indicated by the symbol X in Figure 2) was machined. I'm trying to scrape it off. The reason for cutting off the X section of the pedestal top steel plate 1c is to ensure the installation accuracy of the pressure vessel 2, in other words, to accurately level the bearing plate 4 on which the pressure vessel support skirt 3 is directly placed. That is, since the cylindrical steel plates 1a and lb located inside and outside the pedestal 1 are constructed by sequentially welding steel plates divided into many parts from below, the surface of the pedestal top steel plate IC is accurately leveled from the beginning. Therefore, in the past, a part of the pedestal top steel plate 1c was machined in order to accurately level the bearing plate 4, but this work required special and expensive work. A processing machine is required, and this work has the drawback of requiring a lot of time and effort.

The present invention has been made in consideration of the above points, and includes:
The objectives are to create a reactor pressure vessel basic structure with excellent earthquake resistance, and a reactor pressure vessel that does not require machining of the steel plate at the top of the pedestal, is economical, and shortens the construction period. The aim is to provide a method for constructing the basics.

In the basic structure of a reactor pressure vessel according to the present invention, a bearing plate is attached to a pedestal via a foundation bolt, and a pressure vessel is installed and fixed on this bearing plate. A bearing plate whose position in the height direction can be freely adjusted is arranged horizontally above the pedestal top steel plate constituting the pedestal, and the gap between the bearing plate and the pedestal top steel plate is used as a mortar-filled layer. It is characterized by integrally attaching the seven lunges of the pressure vessel support skirt and the steel plate on the top of the pedestal via a play.

Further, the method for constructing the foundation of a nuclear reactor pressure vessel according to the present invention includes:
A mortar driving frame wall is formed, which is located inside the pedestal top steel plate constituting the top of the pedestal and faces the biological shielding wall, and above the pedestal top steel plate,
Bearing play If whose position in the height direction can be adjusted freely
The surface of the bearing plate is adjusted horizontally, and mortar is poured into the recess formed between the mortar-driving frame wall and the biological shielding wall to fill the gap between the bearing plate and the pedestal top steel plate. is filled with mortar, and then the flange of the pressure vessel support skirt and the pedestal top steel plate are attached to the seven bodies via the bearing plate.

Hereinafter, the present invention will be explained based on an embodiment of FIG. 3. This figure is a longitudinal cross-sectional view of the main part showing the basic structure of a reactor pressure vessel obtained by carrying out the method of the present invention. Well, the first
The same parts as in the figure and FIG. 2 are given the same reference numerals. In FIG. 3, a pedestal top steel plate 1c constituting the top of the pedestal l is provided with a plurality of holes for attaching foundation bolts. A nut 6 is integrally welded to the bottom of the pedestal top steel plate IC, and the foundation bolt 5 is fixed to the pedestal top steel plate 1c via the nut 6. A mortar driving frame wall 9 is formed inside the pedestal top steel plate 1c, facing the biological shielding wall 8. A bearing plate 4 is attached to the foundation bolt 5 via a shim 10 whose position in the height direction can be freely adjusted.
The surface portion is leveled by a shim 10.

In the embodiment shown in FIG. 3, the shim 10 is used as a means for adjusting the horizontal direction of the bearing plate 4, but instead of the shim 10, as shown in FIG. The bearing plate 4 may be leveled by fitting a nut 11 into the bearing plate 5 and moving the position of the nut 11 up and down.

Once the surface of the bearing plate 4 has been adjusted horizontally as described above, mortar is driven into the recess formed between the mortar driving frame wall 9 and the biological shielding wall 8, and the bearing plate 4 is 4 and pedestal top steel plate IC
Let the void between the two be the mortar filling layer 12. and,
After that, the pressure vessel 2 is suspended and the bearing plate 4 is
The pressure vessel support skirt 3 is attached to the pressure vessel support skirt 3 via the foundation bolts 5 and nuts 13 set above and fixed to the bearing plate 4.
The flange 3a and the pedestal top steel plate IC are integrally attached.

The present invention is as described above, and in the basic structure of the reactor pressure vessel constructed by the method of the present invention, among the loads transmitted from the pressure vessel 2, the shear load is immediately transferred to the steel of the pedestal 1 by the foundation bolts 5. This will be communicated to the manufacturing department.
Furthermore, the compressive load is also immediately transmitted to the steel parts of the pedestal 1 via the foundation bolts 5 and the mortar filled layer 12, making it possible to provide this type of structure with excellent earthquake resistance.

Furthermore, when the reactor pressure vessel foundation construction method according to the present invention is adopted, the position of the bearing plate 4 in the height direction above the pedestal top steel plate IC can be adjusted freely, and its surface can be easily leveled. Therefore, there is no need for complicated machining such as cutting off a part of the steel plate IC at the top of the pedestal as in the conventional case. As a result, special and expensive processing machines are no longer required, making it possible not only to reduce the cost of constructing the foundation of a reactor pressure vessel, but also to significantly shorten the construction period for this type of work compared to conventional methods. can.

As described in detail above, according to the present invention, the basic structure of the reactor pressure vessel with excellent earthquake resistance and the machining of the pedestal top steel plate IC are not required, making it economical and reducing the amount of machinery required. It is possible to provide a method for constructing the foundation of a nuclear reactor pressure vessel that can measure the following.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view showing the basic structure of a conventional reactor pressure vessel, Figure 2 is an enlarged view of section A in Figure 1, and Figure 3 is a reactor pressure vessel obtained by implementing the method of the present invention. FIG. 4 is a vertical cross-sectional view of the main parts showing another embodiment of the present invention. 1... Pedestal, 1a and 1b... Cylindrical steel plate, IC... Pedestal top steel plate, 2... Pressure vessel,
3... Pressure vessel support skirt, 4... Bearing plate, 5... Foundation bolt, 6... Nut, 7...
・Concrete layer, ・・Biological shielding wall, 9... Frame wall for pouring mortar, 10... Shim, 11... Nut,
12...Mortar filling (@lru]

Claims (1)

[Claims] 1. In the basic structure of a nuclear reactor pressure vessel, in which a bearing plate is attached to the pedestal via foundation bolts, and a pressure vessel is installed and fixed on this bearing plate,
Above the pedestal top steel plate that makes up the top of the pedestal, a bearing plate whose height can be adjusted is placed horizontally. and a gap between the bearing plate and the pedestal top steel plate is filled with mortar, and the flange of the pressure vessel support skirt and the pedestal top steel plate are integrally attached via the bearing plate. Basic structure of the reactor pressure vessel. 2. A mortar driving frame wall is formed to be located inside the pedestal top steel plate that constitutes the top of the pedestal and faces the biological shielding wall, and a frame wall for placing mortar is formed above the pedestal top steel plate at a position in the height direction. A bearing plate that can be freely adjusted is placed, its surface is adjusted horizontally, and mortar is driven into the recess formed between the mortar driving frame wall and the biological shielding wall, and the bearing plate and pedestal are A method for constructing a foundation for a nuclear reactor pressure vessel, characterized by filling a gap between the top steel plate and the top steel plate with mortar, and then integrally attaching the flange of the pressure vessel support skirt and the pedestal top steel plate via the bearing plate. .