JPH0143589Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" The present invention relates to the structure of piping penetrations in reactor containment vessels, etc., and in particular, the invention relates to the structure of piping penetrations in reactor containment vessels, etc. It is about the surrounding structure.

"Prior Art" Figure 1 shows an example of a structure around a pipe that penetrates a conventional reactor containment vessel and an external shielding wall surrounding it. A heat insulating material 4 is provided on the outer periphery of the piping 3 passing through the reactor containment vessel 1, and a closing plate 5 is provided between the heat insulating material 4 and the external shielding wall 2, and a support ring 6 is provided inside the reactor containment vessel 1. is provided between the support ring 6 and the closure plate 5, and the heat insulating material 4 is provided between the support ring 6 and the closure plate 5.
an inner sheathing tube 8 having a plurality of bellows 7 is interposed therebetween, and
An outer cladding tube 10 that covers the inner cladding tube 8 at intervals in the circumferential direction and has a plurality of bellows 9 is interposed between the closing plate 5 and the reactor containment vessel 1,
A spacer 11 is provided between the bellows 7 of the inner cladding tube 8 and the outer cladding tube 10 to connect the two cladding tubes 8 and 10 to each other.

The structure of the conventional piping penetration part is such that the relative movement between the reactor containment vessel 1 and the external shielding wall 2 and the piping 3
Thermal expansion and contraction, etc. of It's getting old.

However, in the structure of such a conventional pipe penetration part, the following problems still remain to be improved.

That is, since the closing plate 5, the support ring 6, the spacer 11, etc. are all integrated by welding, the work tends to become complicated when carrying out internal repairs or the like. In addition, the piping 3
When the piping is displaced in the radial direction due to thermal expansion and contraction, etc., the displacement is restrained by the closing plate 5 and the spacer 11, causing concentration of stress on the piping 3 and the heat insulating material 4. Easy to store. Such problems are listed as matters that should be particularly avoided from the standpoint of the integrity of nuclear power plants.

"Purpose of the invention" The present invention was made in view of the conventional circumstances mentioned above, and its purpose is to absorb the displacement when piping, etc. is displaced in the radial direction, and to It is an object of the present invention to provide a structure for a piping penetration part of a reactor containment vessel, etc., which reduces stress by converting external force in the radial direction acting on the reactor into the longitudinal direction, and also simplifies the structure and facilitates repair work.

"Structure of the invention" In order to achieve the above-mentioned object, the present invention provides a heat insulating material integrally on the outer periphery of the piping that penetrates the reactor containment vessel and the external shielding wall surrounding the reactor containment vessel, and An inner cladding tube is integrally provided to cover the heat insulating material, and outer cladding tubes are provided at intervals around the entire circumference of the inner cladding tube, and the outer circumferential surface of the outer cladding tube and the outer shielding wall are connected to each other. A hollow truncated conical spacer is provided between them to cover the gap between them, one end of the outer cladding tube is welded to the piping so as to cover one end of the inner cladding tube and the heat insulating material, and the other end is welded to the piping, and the other end is welded to the piping, covering one end of the inner cladding tube and one end of the heat insulating material. A bellows is welded to the reactor containment vessel and is provided in the middle to absorb expansion and contraction in the length direction, and one end of the spacer is seal-welded to the external shielding wall over the entire circumference, and the other end is welded to the outer shielding wall. A portion of the outer cladding tube is seal-welded to the outer periphery of the outer cladding tube.

"Example" The present invention will be described below based on an example shown in FIGS. 2 and 3. In addition, in the following explanation, the first
The same reference numerals are used for parts common to the figures to simplify the explanation.

The structure of the pipe penetration part of the reactor containment vessel etc. in this embodiment is as follows: the reactor containment vessel 1 and the reactor containment vessel 1
A heat insulating material 4 is integrally provided on the outer periphery of the piping 3 that penetrates the external shielding wall 2 surrounding the pipe 3, and an inner cladding tube 12 is integrally provided to cover the heat insulating material 4. An outer cladding tube 13 is provided at intervals over the outer cladding tube 13, and a hollow truncated conical spacer 14 is provided between the outer peripheral surface of the outer cladding tube 13 and the external shielding wall 2 to cover the gap g therebetween. , the outer cladding tube 13 has one end connected to the inner cladding tube 1.
2 and one end of the heat insulating material 4 is welded to the piping 3, and the other end is welded to the reactor containment vessel 1,
A bellows 15 is provided in the middle to absorb expansion and contraction in the length direction, and one end of the spacer 14 is seal-welded to the external shielding wall 2 over the entire circumference, and the other end is sealed to the external shielding wall 2. Cladding tube 13
It has a general structure with a seal welded to the outer periphery.

Next, to explain these details in detail, the inner cladding tube 12 is provided in contact with the outer periphery of the heat insulating material 4, and one end thereof is located at the penetrating portion of the outer shielding wall 2, so that the outer cladding tube 12 13 is welded to the inner circumferential surface of one end thereof, and the other end thereof is made to protrude into the inside of the reactor containment vessel 1.

The external cladding tube 13 penetrates the reactor containment vessel 1 and the external shielding wall 2 and protrudes to the outside of the external shielding wall 2, and one end, that is, the protruding end, is gradually made smaller in diameter and is connected to the heat insulating material. 4 and one end of the inner cladding tube 12 is welded to the piping 3 so as to cover one end of the inner cladding tube 12. In addition, in the middle in the length direction, that is, between the reactor containment vessel 1 and the external shielding wall 2,
Two bellows 15 are provided at an interval.

The spacer 14 is provided with a radially outward flange 14a on the large diameter portion, and the flange 14a is fixed to the outer surface of the external shielding wall 2 by an anchor bolt 16 as shown in FIG. By seal welding, the inside and outside of the external shielding wall 2 are airtightly separated. Further, the small diameter portion of the spacer 14 is integrated with the outer peripheral surface of one end of the outer cladding tube 13 by seal welding.

In the structure of the pipe penetration part of this embodiment configured in this way, the reactor containment is carried out by the outer cladding tube 13, the welded part W1 between the outer cladding tube 13 and the reactor containment vessel 1, and the spacer 14. The interior and exterior of the container 1 and the external shielding wall 2 can be airtightly separated, and the spacer 14
6 and is fixed to the external shielding wall 2 by seal welding, making it easy to attach and detach and simplify repair work. In addition, since the other end of the inner cladding tube 12 is a free end, the outer cladding tube 13 may be damaged due to relative movement between the reactor containment vessel 1 and the outer shielding wall 2 or thermal displacement of the outer cladding tube 13. The expansion and contraction in the length direction is absorbed by the bellows 15, and the piping 3
Even if a radial displacement occurs in the piping 3, the spacer 14 deforms in a curved manner as shown by the chain line in FIG. Convert in length direction. Therefore, concentration of stress on the pipe 3 can be prevented and damage to the pipe 3 can be prevented.

Note that the shapes of each component shown in the above embodiments are merely examples, and can be variously changed based on design requirements and the like.

"Effects of the Invention" As explained above, the structure of the piping penetration part of the reactor containment vessel, etc. according to the present invention simplifies the piping penetration part and makes it easy to attach and detach, thereby making it possible to repair the piping penetration part. In addition to simplifying the process, it also has excellent effects such as preventing the concentration of stress on the piping and greatly improving the health of the nuclear power plant.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing an example of the structure of a pipe penetration part of a conventional reactor containment vessel, etc. Fig. 2 and Fig. 3 are a longitudinal cross-sectional view showing an example of an embodiment of the present invention. FIG. 3 is an enlarged view of the portion shown in FIG. 2. 1... Reactor containment vessel, 2... External shielding wall, 3
... Piping, 4 ... Insulating material, 12 ... Internal cladding pipe,
13...Outer cladding tube, 14...Spacer, 14a
...Tsuba, 15...Bellows, 16...Anchor bolt.

Claims (1)

[Scope of utility model registration request] A heat insulating material is integrally provided on the outer periphery of the piping that penetrates the reactor containment vessel and an external shielding wall surrounding the reactor containment vessel, and an internal cladding tube is integrally provided to cover the heat insulating material. An outer cladding tube is provided on the outer periphery at intervals over the entire circumference, and a hollow truncated conical spacer is provided between the outer peripheral surface of the outer cladding tube and the external shielding wall to cover the gap therebetween,
One end of the outer cladding tube covers one end of the inner cladding tube and the heat insulating material and is welded to the piping, the other end is welded to the reactor containment vessel, and the intermediate portion absorbs expansion and contraction in the length direction. A bellows is provided,
A nuclear reactor containment vessel, etc., characterized in that one end of the spacer is seal-welded to the outer shielding wall over the entire circumference, and the other end is seal-welded to the outer periphery of the outer cladding tube. structure of pipe penetrations.