JPH0571798U - Structure of reactor shield wall - Google Patents

Abstract

(57) [Summary] [Purpose] To facilitate design changes during construction work, etc.
The construction work will be simplified to shorten the construction period, and it will be possible to install new equipment after the start of operation. [Structure] An inner cylinder 4 and an outer cylinder 5 made of steel that surround the reactor pressure vessel in a double ring shape are erected, and at the inner radius of the outer cylinder 5, concentric with both cylinders. -Shaped partition wall 12 is erected, and concrete 1 is placed between the partition wall 12 and the inner cylinder 4.
3, the space 13 between the partition wall 12 and the outer cylinder 5
In addition, a plurality of reinforcing members 14 fixed to each part of the inner surface of the outer cylinder 5
15 was provided. [Effect] The reinforcement member enables the equipment to be installed at any position on the outer surface of the outer cylinder, and the presence of the space eliminates the heat effect on the concrete even after installation, and the inner cylinder facing the concrete filling space and Since the surface of the partition wall can be formed straight, the concrete filling operation can be facilitated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a reactor shield wall in which steel sheets are filled with concrete, and more particularly to a structure of a reactor shield wall in which equipment such as a pipe whip structure is attached to an outer peripheral surface.

[0002]

[Prior Art]

 The reactor shielding wall is erected to surround the reactor pressure vessel for the purpose of shielding neutrons and various radiation emitted from the reactor pressure vessel. Therefore, a pipe whip structure or the like for supporting the pipe is attached to the outer peripheral surface thereof.

4 and 5 show an example of a conventional reactor shield wall. The reactor shield wall 1 includes a steel inner cylinder 4 and an outer cylinder 5 that surround the reactor pressure vessel 2 in a double ring shape on a reactor pedestal 3 that supports the reactor pressure vessel 2. The vertical ribs 6 are connected to each other in a standing manner, and concrete 7 is filled between the two cylinders 4 and 5 to form an integrated structure. Gamma rays and neutrons are formed between the steel plates 4 and 5 and the concrete 7. In addition to shielding wires and the like, a pipe whip structure or the like is attached to the outer peripheral surface of the outer cylinder 5. 4 and 5 show the vicinity of the nozzle 8 projecting from the reactor pressure vessel 2, and a window 9 for inserting the nozzle 8 is formed, and the window 8 is provided with the nozzle 8 and the reactor shield wall 1. An openable and closable shield plug 10 that closes the gap is provided.

[0004]

[Problems to be solved by the device]

 However, when a pipe whip structure or the like is fixed to the outer peripheral surface of the outer cylinder 5 by welding, it is necessary to previously provide a reinforcing member on the back surface of the outer cylinder 5 at the fixed portion. For this reason, it is necessary to know the layout and size of all equipment to be attached to the outer peripheral surface of the reactor shield wall 1 at the design stage. Was impossible. The presence of such reinforcing members, particularly the presence of reinforcing members along the horizontal direction, tend to leave air pockets during concrete filling, which complicates filling management, resulting in a longer construction period. In addition, it was practically impossible to newly install equipment on the outer peripheral portion of the outer cylinder 5 after the start of the operation of the nuclear reactor because the heat deterioration of the concrete caused by welding.

The present invention effectively solves the above problems, and facilitates design changes during construction work, simplifies construction work, and shortens the construction period. The purpose is to enable mounting.

[0006]

[Means for Solving the Problems]

 In the present invention, a steel inner cylinder and an outer cylinder that surround the reactor pressure vessel in a double ring shape are erected, and at the inner position of the radius of the outer cylinder, a concentric cylinder is formed with both cylinders. A partition wall was erected, concrete was filled between the partition wall and the inner cylinder, and a plurality of reinforcing members fixed to each part of the inner surface of the outer cylinder were provided in the space between the partition wall and the outer cylinder. It is characterized by

[0007]

[Action]

 With the structure of the present invention, the surfaces of the inner cylinder and the partition wall facing the concrete filling space can be formed straight, and the concrete filling operation between them can be smoothly performed. In addition, when a device such as a pipe whip structure is attached to the outer peripheral surface of the outer cylinder, a reinforcing member is provided on each part of the inner surface of the outer cylinder. , It can be reinforced. Moreover, the mechanical strength of the outer cylinder itself is improved by the reinforcing member provided on the back surface thereof. And since the back surface of this outer cylinder is a space, even if equipment etc. are installed after the construction of the reactor shielding wall, there is no thermal effect on the concrete.

[0008]

【Example】

 An embodiment of the structure of the reactor shield wall according to the present invention will be described below with reference to FIGS. In the figure, the same parts as those of the conventional example shown in FIGS. 4 and 5 are designated by the same reference numerals and the description thereof will be omitted. The reactor shield wall 11 includes a reactor pedestal 3, an inner cylinder 4 and an outer cylinder 5, which are formed by connecting a number of steel plates by welding or the like. The inner cylinder 4 and the outer cylinder 5 surround the circumference of the reactor pressure vessel 2. A plurality of vertical ribs 6 are provided upright in a ring shape and connect between the inner cylinder 4 and the outer cylinder 5 in a radial manner, and each of the vertical ribs is located at a position radially inward of the outer cylinder 5. A partition wall 12 is erected so as to connect between the ribs 6 and to have a cylindrical shape that is concentric with both the cylinders 4 and 5 as a whole. Then, between the partition wall 12 and the inner cylinder 4, concrete 7 is filled so as to fill each space having a fan-shaped cross section surrounded by the partition wall 12, the inner cylinder 4 and the vertical ribs 6.

On the other hand, a space 13 is left between the partition wall 12 and the outer cylinder 5, and the space 13 is provided with a plurality of reinforcing members 14 and 15 fixed to the inner surface of the outer cylinder 5. The reinforcing members 14 and 15 are composed of, for example, a flat bar 14 extending in the horizontal direction and a cut tee 15 extending in the vertical direction parallel to the vertical ribs 6, and are arranged in the horizontal direction so as to form a grid pattern shown in FIG. 3 as a whole. Also, they are provided in an aligned state at regular intervals in the vertical direction. Of these, the cut tee 15 along the vertical direction has its flange 15a reaching the outer surface of the partition wall 12 and connecting the partition wall 12 and the outer cylinder 5. Further, the flat bar 14 is provided with a slight gap between it and the partition wall 12, and a notch 16 is provided in the vicinity of the joint with the vertical rib 6 and the cut tee 15. Care is taken not to create a closed space surrounded by 15 etc.

Reference numeral 17 is a support member for supporting the pipe 18 near the outer peripheral surface of the outer cylinder 5, and reference numeral 19 is a top plate that covers the upper portion of the reactor shielding wall 11.

When constructing the reactor shielding wall 11 having such a structure, the inner cylinder 4 and the outer cylinder 5 are erected on the reactor pedestal 2 in a double ring shape, and both cylinders 4 are 5 are integrally connected by the vertical ribs 6, and the reinforcing members 14 and 15 are welded to the inner surface of the outer cylinder 5. At this time, the cut tee 15 is provided inward in the radial direction, and the flange 15a at the tip thereof is arranged in parallel with the inner cylinder 4, and its flange 15a is used as a backing plate. The partition wall 12 is connected between the vertical ribs 6 while welding.

Next, concrete 7 is filled in each space having a fan-shaped cross section surrounded by the partition wall 12, the inner cylinder 4, and the vertical ribs 6, and the top is closed by a top plate 19. Since the surface of the inner cylinder 4, the partition wall 12, and the vertical ribs 6 are formed vertically straight in this filling operation, the filling operation can be performed smoothly without air pockets and the nuclear reactor. It is possible to fill the shielding wall 11 from the lower end to the upper end at one time.

When a device such as a pipe whip structure is attached to the outer peripheral portion of the reactor shielding wall 11 constructed in this way, the device or the support member 17 as shown in FIG. Can be installed. That is, when the mounting portion of these devices and the support member 17 are placed on the outer peripheral surface of the outer cylinder 5, the reinforcing members 14 and 15 are provided on the inner surface of the outer cylinder 5 in the vertical and horizontal directions. Since a part of 15 is always arranged on the back surface of the mounting position of the device or the like, the reinforcing members 14 and 15 can surely and firmly support the device or the like. Of course, the outer cylinder 5 itself is also sufficiently reinforced by the reinforcing members 14 and 15 arranged vertically and horizontally, so that these devices and the like can be firmly supported.

[Effect of the device]

 As described above, according to the structure of the reactor shield wall in the present invention, the following effects can be obtained. (1) When a device such as a pipe whip structure is attached to the outer peripheral surface of the outer cylinder, a reinforcing member is provided on each part of the inner surface of the outer cylinder, so that the reinforcing member is arranged on the back surface of the mounting position of the device. Therefore, it can be reinforced, and it can be attached to any position, and it can easily respond to design changes. The mechanical strength of the outer cylinder itself is also improved by the reinforcing member provided on the back surface thereof, so that the device can be reliably and firmly supported. (2) Since the back surface of the outer cylinder is a space, even if equipment etc. are attached by welding after the construction of the reactor shield wall, there is no heat effect on the concrete and the remodeling work etc. can be facilitated. it can. (3) Since it is not necessary to provide a reinforcing member along the horizontal direction on the surfaces of the inner cylinder facing the concrete filling space and the partition wall, the surface of the inner cylinder and the partition wall can be formed straight. Therefore, the concrete filling work in the meantime can be performed smoothly.

[Brief description of drawings]

FIG. 1 shows an embodiment of the structure of a reactor shield wall according to the present invention, and is a partial cross-sectional view thereof.

FIG. 2 is a vertical sectional view of one embodiment.

FIG. 3 is a view taken along the line AA in FIG.

FIG. 4 is a vertical cross-sectional view showing a structural example of a conventional reactor shield wall.

5 is a view taken along the line BB in FIG.

[Explanation of symbols] 2 Reactor pressure vessel 3 Reactor pedestal 4 Inner cylinder 5 Outer cylinder 6 Vertical ribs 7 Concrete 11 Reactor shielding wall 12 Partition wall 13 Space portion 14 Flat bar (reinforcing member) 15 Cut tee (reinforcing member) 15a Flange 16 Notch 17 Support member 18 Piping 19 Top plate

Claims (1)

[Scope of utility model registration request] 1. A steel inner cylinder and an outer cylinder that surround the reactor pressure vessel in a double ring shape are erected, and a cylindrical shape concentric with both cylinders is located inside the outer cylinder. A partition wall is erected on the wall, and concrete is filled between the partition wall and the inner cylinder.
A structure of a nuclear reactor shielding wall, characterized in that a plurality of reinforcing members fixed to respective parts of the inner surface of the outer cylinder are provided in a space portion between the partition wall and the outer cylinder.