JPH07159564A - Vertical pressure tube type atomic reactor facility and assembling method therefor - Google Patents

Abstract

PURPOSE:To provide a vertical pressure tube type atomic reactor main body structure and its assembling method simplifying the structure of a pressure tube type atomic reactor in particular, making it small-sized and lightweight, improving its economical efficiency, and suitable for reducing the assembling work at the site. CONSTITUTION:A reactor main body side section is inspected by a remotely controlled inspecting device, a side section iron/water shielding body 4 is eliminated, and a calandria tank 1, an upper iron/water shielding body 2, and a lower iron/water shielding body 4 are formed into an integrated structure to obtain a vertical pressure tube reactor main body structure. It is integrally manufactured in a factory, and it is integrally transported to the site and installed in a reactor building by the assembling method of the reactor main body. When the side section iron/water shielding body is eliminated, the reactor main body is effectively made small-sized and lightweight. It is formed into the integral structure, it is integrally transported to the site and installed in the reactor building, thereby the assembling work at the site can be effectively reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure tube type nuclear reactor, and particularly to a vertical type suitable for simplifying the structure, reducing the size and weight of the reactor to improve the economical efficiency, and reducing the on-site assembly work. The present invention relates to a pressure tube reactor body.

[0002]

2. Description of the Related Art A vertical pressure tube type reactor body structure is shown in FIG.

The main body of the reactor is a calandria tank for storing a moderator, an upper, side and lower iron-water shields 2, 3, 4 for shielding radiation, and a calandria tank for storing fuel and a reactor coolant. 1 and the upper and lower ferrous water shields 2 and 4 are composed of a large number of pressure pipe assemblies 5 which penetrate vertically.

The calandria tank 1 is a cylindrical container made of stainless steel, and inside thereof, a calandria tube 6 made of a zirconium alloy, whose upper and lower ends are joined to the upper and lower tube plates of the calandria tank 1, is installed. The body of the calandria tank 1 is provided with a convex portion in order to absorb the difference in thermal expansion in the axial direction due to the difference in material with the calandria tube 6.

The iron water shield is a container installed so as to surround the calandria tank 1. The upper tube plate of the upper iron water shield 2 is formed by the upper tube plate of the calandria tank 1 and the upper iron water sleeve 7. It is connected. The lower tube sheet of the lower iron-water shield 4 is connected to the lower tube sheet of the calandria tank 1 by the lower iron-water sleeve 8.

The pressure pipe assembly 5 is inserted into the calandria pipe 6, the upper and lower iron-water sleeves 7, 8 and attached to the lower iron-water sleeve 8.

FIG. 7 shows a load transmission path of the reactor body structure.

Calandria tank 1 and pressure pipe assembly 5
The mass is supported by the box-shaped lower iron / water shield body annular portion 9 through the lower tube plate of the thick lower iron / water shield body 4. Further, the upper and side iron water shields 2 and 4 are also supported by the lower iron water shield annular portion 9. The mass of the reactor main body is finally transmitted to the reactor support floor 10 via the lower iron / water shield annular portion 9.

As for the method of assembling the reactor body, the calandria tank 1, the upper, side and lower iron water shields 2,
3 and 4 are individually manufactured in the factory, and are assembled and connected integrally at the site. After that, the upper and lower iron-water sleeves 7 and 8 and the calandria pipe 6 are connected.

The following documents are known examples of the prior art.

Hitachi Review, VOL.74 No.6 (1992,6) and Hitachi Review, VOL.59 No.4 (1977,4)

[0012]

In the above vertical pressure tube type reactor body, the calandria tank and the upper, side and lower iron-water shields have a divided structure, and they are assembled together at the site. Due to the connection, there is more work on site. From the viewpoint of improving the economic efficiency and shortening the construction process, it is important to reduce the size and weight of the structure of the nuclear reactor itself and to simplify the structure and reduce the work on site.

From the viewpoint of downsizing and weight reduction, the rationalization of the iron-water shield which is installed so as to surround the calandria tank is a key point, but the worker approaches the reactor body when inspecting the iron-water shield. Since it has a shielding function so that it can be done, it is necessary to devise automation such as inspection work in order to rationalize it. In addition, it is necessary to secure a load transmission path of the reactor body and to have a structure with high rigidity in a rationalized structure. Further, it should be noted that the structure change of the calandria tank due to the change of the route of load transmission is a structure capable of absorbing the difference in thermal expansion between the calandria tank and the calandria pipe.

As for the reduction of the work on site, the simplification of the structure including the above-mentioned miniaturization and weight saving has led to the on-site assembly,
It is necessary to devise to minimize the connection work.

An object of the present invention is to provide a vertical pressure tube type which can rationalize an iron / water shield to reduce the size and weight of the reactor body and ensure a load transmission path and rigidity as the reactor body. It is to provide a reactor body structure.

Another object of the present invention is to provide a vertical pressure tube type reactor main body structure and an assembling method thereof, which can reduce the assembling and connecting operations on site.

[0017]

In order to achieve the above object, the side portion of the reactor main body is inspected by a remote operation inspection device to remove the side iron water shield. In addition, the upper iron / water shield is connected to and integrated with the calandria tank upper tube sheet, and the lower iron / water shield is connected to and integrated with the calandria tank lower tube sheet to provide a high load transmission path and high rigidity. It secures the structure of the reactor body.

Further, the reactor main body structure in which the calandria tank and the upper and lower iron / water shields are integrated as described above is manufactured in the factory, and is transported to the site as it is and installed in the reactor building. It is a thing.

As another means for achieving the above object, the reactor body has a single structure of a calandria tank,
The shielding structure that is not connected to the calandria tank is installed on the upper and lower parts of the reactor body.

As described above, the upper shield structure and the lower shield structure, which are different from the structure of the calandria tank, are installed in the reactor building separately from the structure of the calandria tank after the calandria tank is installed. To do so.

[0021]

[Operation] By inspecting the side of the reactor main body by the remote control inspection device, in principle, there is no need for workers to enter, and there is no need to shield the side of the reactor main body. The iron and water shield can be deleted.
The mass of the upper iron / water shield can be supported by the calandria tank by connecting to the calandria tank upper tube sheet. By connecting and integrating the lower iron / water shield and the calandria tank lower tube sheet, it is possible to secure the rigidity of the lower part of the reactor main body where the load of the pressure tube assembly, the calandria tank, etc. is concentrated. As a result, the reactor body structure can be reduced in size in the radial direction, and the weight can be reduced.

As described above, the reactor main body structure in which the calandria tank and the upper and lower iron-water shields are integrated is manufactured in the factory, transported to the site as it is, and installed in the reactor building. It is possible to reduce the assembling and connecting work.

By making the reactor body a single structure of the calandria tank, the reactor body structure can be downsized in the height direction, and the weight can be further reduced. By providing a shield structure in the upper and lower portions of the reactor body that is not connected to the calandria tank, the upper and lower portions of the reactor body can be shielded.

As described above, the upper shield structure and the lower shield structure, which are separate structures from the Calandria tank, are installed after the Calandria tank is installed by the installation structure different from that of the Calandria tank.
It is possible to reduce assembly and connection work on site.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a vertical sectional view of a vertical pressure tube type reactor body structure. Calandria tank 1 for storing moderator
An upper and lower iron-water shields 2 and 4 that shield radiation and a large number of pressure pipes that vertically and vertically penetrate the calandria tank 1 and the upper and lower iron-water shields 2 and 4 that contain fuel and reactor coolant. It is composed of the body 5.

Here, as the inspection work of the side of the reactor main body, there is a visual inspection at the time of a pressure leakage test. For this inspection work, the track 21 installed on the side of the reactor main body is moved by remote control. However, the camera 22 that can be inspected is used, the request for shielding the side of the reactor body has been deleted, and the side iron-water shield is not installed.

Conventionally, the upper iron / water shield 2 was supported by the side iron / water shield, but since the side iron / water shield was deleted, the upper iron / water shield 2 was attached to the upper pipe of the calandria tank 1. Connect with the board. Since the mass of the upper iron / water shield 2 is supported by the calandria tank 1, the body of the calandria tank 1 is thickened to ensure a supporting function.

Calandria tank 1 and Calandria tube 6
The difference in the thermal expansion in the axial direction is absorbed by facilitating the deformation by thinning the upper tube sheet of the calandria tank 1. FIG. 2 shows an enlarged view of the upper part of the calandria tank 1 and a modified schematic diagram when the difference in thermal expansion is absorbed (shown by a dotted line). The calandria pipe 6 has a structure in which the upper pipe sheet of the calandria tank 1 is thinned and it is difficult to connect it, and therefore the calandria pipe 6 is connected to the upper iron-water sleeve 7.

Calandria tank 1 and Calandria tube 6
Another embodiment as a mechanism for absorbing the difference in thermal expansion in the axial direction of FIG.
Shown in. The portion of the upper tube plate of the calandria tank 1 that is connected to the calandria tube 6 remains thick, and the outer peripheral portion is made thin to absorb the difference in thermal expansion.

The lower iron / water shield 4 is connected to the lower tube plate of the calandria tank 1. The lower tube plate of the thick calandria tank 1 and the lower tube plate of the lower iron-water shield 4 which are connected to the body of the lower iron-water shield 4 by the lower iron-water sleeve 8 form a highly rigid structure. The mass of the nuclear reactor main body such as the calandria tank 1 and the pressure pipe assembly 5 is supported. The reactor body is supported on the reactor support floor 10, which is a part of the reactor building, by a support skirt structure 23 connected to the body of the thick calandria tank 1.

Another embodiment of the support structure of the reactor body is shown in FIG.
Shown in. The reactor main body is provided with a rib structure 24 connected to the body of the thick calandria tank 1 so that the reactor support floor 10
Supported by.

The reactor body of this embodiment shown in FIG. 1 has a side iron water shield and outer peripheral portions of the upper and lower iron water shields 2 and 4, and a calandria tank 1 as compared with the conventional structure.
The convex portion of is removed, and the reactor main body is greatly reduced in size in the radial direction and the weight is reduced. In addition, the calandria tank 1 and the upper and lower iron / water shields 2 and 4 are integrated to simplify the structure.

Calandria tank 1 of the reactor body
Assembly of the upper and lower iron-water shields 2, 4 and connection of the calandria pipe 6, upper and lower iron-water sleeves 7, 8 are carried out in the factory. The reactor body, which is smaller and lighter and is integrated, is transported to the site as it is and installed in the building.

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

The reactor body has a single structure of the calandria tank 1 for containing the moderator, and the upper and lower shielding structures 31 and 32 for shielding radiation are separate structures which are not connected to the calandria tank 1. A pressure pipe assembly 5 containing fuel and reactor coolant vertically penetrates the calandria tank 1 and the upper and lower shielding structures 31, 32.

The inspection work on the side of the reactor body is carried out by the camera 22 by remote control, as in the embodiment shown in FIG.
The mechanism for absorbing the difference in thermal expansion between the calandria tank 1 and the calandria pipe 6 in the axial direction and the support structure for the reactor body are the same as those in the embodiment of FIG. The lower tube sheet of the calandria tank 1 is thinned in order to suppress heat generation by gamma rays as much as possible because the cooling mechanism on the lower surface of the tube sheet is eliminated by removing the lower iron-water shield. Therefore, the calandria pipe 6 is connected to the lower ferrous water sleeve 8 similarly to the upper joint. Further, the deformation of the lower tube plate of the calandria tank 1 in which the load of the pressure pipe assembly 5 and the like is concentrated is prevented by installing the lower shielding structure 32 and the deformation preventing metal fitting 33 for supporting the load in a shared manner. .

The nuclear reactor main body of this embodiment is made smaller in size not only in the radial direction but also in the height direction as compared with the conventional structure, so that the weight and the structure are simplified.

The manufacture of the calandria tank 1 of the reactor body and the connection of the calandria pipe 6, the upper and lower iron-water sleeves 7, 8 are carried out in the factory. At the site, after the Calandria tank 1 is installed in the reactor building, the upper and lower shielding structures 31 and 32 are installed in the reactor building with another installation structure.

[0040]

According to the vertical pressure tube type reactor equipment of the present invention, it is possible to reduce the size and weight of the reactor body.
It has the effect of improving economic efficiency and simplifies the structure.

According to the method of assembling the vertical pressure tube type reactor facility of the present invention, the assembling work on site is reduced, and the plant construction process can be shortened.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a vertical pressure tube reactor showing an embodiment of the present invention.

FIG. 2 is a partially enlarged vertical sectional view of an upper portion of the calandria tank in FIG.

FIG. 3 is a vertical sectional view showing a modified example of FIG.

FIG. 4 is a cross-sectional view of a reactor support part showing another embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view of a vertical pressure tube reactor showing still another embodiment of the present invention.

FIG. 6 is a vertical sectional view of a conventional vertical pressure tube reactor.

FIG. 7 is a display diagram of a load transfer path of the nuclear reactor of FIG.

[Explanation of symbols]

1 ... Calandria tank, 2 ... Upper water shield, 3 ...
Side iron water shield, 4 ... lower iron water shield, 5 ... pressure pipe assembly, 6 ... calandria pipe, 7 ... upper iron water sleeve,
8 ... Lower iron-water sleeve, 9 ... Lower iron-water shield ring part,
10 ... Reactor support floor, 21 ... Orbit, 22 ... Camera, 23
... Support skirt structure, 24 ... Rib, 31 ... Upper shielding structure, 32 ... Lower shielding structure, 33 ... Deformation preventing metal fitting.

Claims (4)

[Claims] Claim: What is claimed is: 1. A pressure pipe assembly for accommodating fuel and reactor coolant vertically penetrates through the interior of the calandria tank for accommodating the moderator and upper and lower parts and side parts of the calandria tank for radiation. In a vertical pressure tube reactor composed of an iron-water shield that shields the water, a remote-controlled inspection device is installed on the side of the reactor, and the side iron-water shield is removed and the calandria is removed. A vertical pressure tube reactor facility, characterized in that a tank, an upper iron water shield and a lower iron water shield are integrated. 2. A calandria tank of a vertical pressure tube reactor, an upper iron water shield and a lower iron water shield are integrally manufactured in a factory, and they are transported to the site as they are and operated by remote control. A method for assembling a vertical pressure tube type reactor facility, which is installed in the reactor building facing the side where the equipment is installed. 3. A radiation pipe which encloses a calandria tank for accommodating a moderator and a top and bottom portion and side parts of the calandria tank for vertically accommodating a pressure pipe assembly for accommodating fuel and reactor coolant. In a vertical pressure tube reactor composed of a shield structure that shields the slab, a remote-controlled inspection device is installed on the side of the reactor, and the side shield structure is deleted and the calandria tank and upper shield are removed. A vertical pressure tube reactor facility characterized in that the structure and the lower shield structure are made into a single structure. 4. A calandria tank of a vertical pressure tube type reactor is installed in a reactor building facing a side in a space where a remotely operated inspection device is installed, and thereafter, an upper shielding structure and a lower shielding structure. Is installed in the reactor building with a support structure different from that of the Calandria tank.