JPS61144594A - Supporter for communicating tunnel in nuclear reactor facility - 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] [Technical Field of the Invention] The present invention relates to nuclear reactor equipment, and particularly relates to a communication tunnel that penetrates the subreduction chamber of a reactor containment vessel and communicates the inside of the pedestal with the outside of the reactor containment vessel. The present invention relates to a support device for a communication tunnel in nuclear reactor equipment.

(Technical background of the invention and its problems) FIG. 11 shows a conventional reactor containment vessel 1, in which a biological shielding wall 2 surrounding the reactor containment vessel 1 is provided. It is provided.

On the other hand, at the center of the bottom inside the reactor containment vessel 1, a pedestal 4 that supports the reactor pressure vessel 3 is provided to protrude upward. Additionally, a reactor pressure vessel 3 is attached to the upper end of the pedestal 4.
A reactor shielding wall 5 surrounding the reactor is continuously installed. On the other hand, on the outer periphery of the pedestal 4, a diaphragm floor 6 is provided that divides the inside of the reactor containment vessel 1 into an upper dry well section 1a and a lower subreduction chamber section 1b.

Further, a steel beam 7 is provided below the diaphragm 7O, and the diaphragm floor 6 is supported by a steel column support 8, a pedestal 4, and a reactor containment vessel 1 via this steel beam 7. It is designed so that In addition, in FIG. 11, the reference numeral 9 represents a vent pipe.

By the way, in the nuclear reactor equipment configured in this manner, a through hole 4a is bored in a portion of the pedestal 4 extending to the dry well portion 1a. The worker then approached the lower part of the reactor pressure vessel 3 through this through hole 4a. However, in this case, the workers must inevitably pass through the dry well section 1a, which has a high radiation dose, and there is therefore a risk that the workers will be exposed to radiation while approaching the lower part of the reactor pressure vessel 3.

Therefore, in recent years, instead of providing the through hole 4a, a communication tunnel is provided through the subrepression chamber portion 1b to communicate the inside of the pedestal 4 with the outside of the reactor containment vessel 1, and through this communication tunnel, the reactor pressure vessel 3 A nuclear reactor facility is being considered that is located close to the bottom of the reactor.

However, in this type of conventional nuclear reactor equipment, the communication tunnel was fixedly provided to both the pedestal 4 and the reactor containment vessel 1. Therefore, in this type of nuclear reactor equipment, if a hydraulic dynamic load is generated in the subreduction chamber part a during an accident and this load acts on the communication tunnel, the pedestal 4 and the reactor containment vessel 1 will be subjected to excessive The integrity of the reactor containment vessel 1 is affected by the force acting on it,
There is a risk that safety may be compromised. This situation is the same when relative displacement occurs in the pedestal 4 and the reactor containment vessel 1 during an earthquake, or when thermal expansion of the communication tunnel occurs due to temperature load during an accident. On the other hand, as in Japanese Patent Application No. 59-108194, there is a structure in which an erection support is provided inside the subreduction chamber to support the communication tunnel, but this has the disadvantage that it increases the cost due to the increase in the amount of steel used. be.

[Purpose of the invention]

The present invention was made in view of the above points, and is capable of reducing the load acting on the reactor containment vessel etc. in the event of an accident or an earthquake, and is an inexpensive support for communication tunnels of nuclear reactor equipment. The purpose is to provide equipment.

(Summary of the Invention) The present invention has a reactor containment vessel that is divided into a dry well section and a subrepression chamber section by a diaphragm floor provided around a pedestal, and further includes a nuclear reactor containment vessel that is divided into a dry well section and a subrepression chamber section by a diaphragm floor provided around a pedestal, and further includes In a nuclear reactor facility having a communication tunnel that communicates the inside of the pedestal with the outside of the reactor containment vessel, the communication tunnel is composed of two vibrators arranged coaxially and in series with an axial gap in between. Adjacent ends of the two vibrators are connected to each other by a seal bellows, and the other ends of the two vibrators are fixed to the pedestal and the reactor containment vessel.

[Embodiments of the invention]

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

In addition, the same reference numerals are given to the same parts as in the conventional art, and the explanation thereof will be omitted.

FIG. 1 shows a first embodiment of supporting a communication tunnel in a nuclear reactor facility according to the present invention. A communication tunnel 1o that communicates with the outside of the reactor containment vessel 1 is provided. This communication tunnel 1o consists of two vibrators 11 and 12 arranged coaxially and in series with an axial gap in between. One vibe 11
As shown in FIG. 2, a cylindrical body 11b having a larger diameter than both of the vibrators 11 and 12 is attached to the side end of the pipe 12 through an annular attachment part 11a, and a cylindrical body 11b having a larger diameter than both of the vibrators 11 and 12 is attached to the other vibrator 12, as shown in FIG. An annular bellows mounting portion 12a is attached thereto. A seal bellows 13 is attached between the vibrator 11 and the vibrator 12. In addition, the mounting part 11a1 cylindrical body 1
1b and the bellows attachment portion 12a function as a bellows cover.

The communication tunnel 10 composed of the pipes 11 and 12 is fixedly supported by the pedestal 4 and the reactor containment vessel 1, and is also supported by the biological shielding wall 2 so as to be movable in the axial direction.

That is, the outer peripheral surface of the pedestal 4 and the inner peripheral surface of the reactor containment vessel 1 are provided with gusset plates 14.15 that tightly engage with the pipes 11.12, and the communication tunnel 10 is connected through the gusset plates 14.15. It is firmly supported by the pedestal 4 and the reactor containment vessel 1. Furthermore, female shag lugs 16 and 17 are attached to the portion of the biological shielding wall 2 facing the communication tunnel 10 at positions above and below the communication tunnel 10, as shown in FIGS. 3 and 4. On the other hand, the female shag 16 of the communication tunnel 10.
Attached to the portion facing 17 are male shag lugs 18 and 19 which are engaged with the female shag lugs 16 and 17.

According to this support device, if an accident occurs and a hydraulic U load is generated on the subreduction chamber portion 1b, the communication tunnel 10
When a load is applied to the reactor, this load is supported by the pedestal 4, the reactor containment vessel 1, and the biological shielding wall 2.

In addition, when relative displacement occurs between the pedestal 4 and the reactor containment vessel 1 or between the reactor containment vessel 1 and the biological shielding wall 2, the expansion and contraction of the seal bellows 13 attached between the pipes 11 and 12 or the female shag 16 17 and the male shag 18, 19.

Therefore, this support device has the following effects.

That is, since the communication tunnel 10 is supported by the pedestal 4, the reactor containment vessel 1, and the biological shielding wall 2,
The load borne by the reactor containment vessel 1 is reduced, and therefore the integrity and safety of the reactor containment vessel 1 can be improved. In addition, pipes 11 and 12 of the communication tunnel 10
Since the seal bellows 13 is provided between them, the relative displacement of the pedestal 4 and the reactor containment vessel 11II and the thermal expansion of the communication tunnel 10 can be easily absorbed. Furthermore, since the communication tunnel 10 is movably supported in the axial direction by the biological shielding wall 2, relative displacement between the reactor containment vessel 1 and the biological shielding wall 2B can be easily absorbed. Furthermore, the communication tunnel 10 is composed of two vias 11 and 12, and each of the vias 11 and 12 is firmly supported by the pedestal 4 and the reactor containment vessel 1.
There is no need for an erection support to support the 0, and therefore costs can be reduced by reducing the amount of steel used.

Further, FIG. 5 shows a second embodiment of the support device according to the present invention, and as shown in FIGS.
The shag structure of the female shag 16, 17 and the male shag 18, 19 at the outer end of the communication tunnel 10 in the embodiment is omitted. Since the communication tunnel 10 is not supported by the living body shielding wall 2, this second embodiment is effective when vibrations such as an earthquake are relatively small.

Furthermore, FIG. 8 shows a third embodiment of the support device according to the present invention, in which the reactor containment vessel 1 is a concrete containment vessel, and the outer end of the communication tunnel 10 is As shown in FIG. 10, it is firmly supported by the reactor containment vessel 1 via gusset plates 21 and 22 that are embedded radially within the concrete frame 20 of the reactor containment vessel 1.

In this embodiment as well, the same effects as in the first embodiment can be obtained.

〔Effect of the invention〕

As explained above, the present invention has a reactor containment vessel that is divided into a dry well section and a subrepression chamber section by a diaphragm floor provided around a pedestal, and further penetrates the inside of the subrepression chamber section. In a nuclear reactor facility having a communication tunnel that communicates the inside of the vedestal with the outside of the reactor containment vessel, the communication tunnel is composed of two vibrators arranged coaxially and in series with an axial gap in between, Adjacent ends of the two vibrators are connected to each other by a seal bellows, and the other ends of the two vibrators are fixed to the pedestal and the reactor containment vessel. It is possible to support the communication tunnel without acting on heavy loads, thereby improving the integrity and safety of the reactor containment vessel. Furthermore, since no erection support is provided, the amount of steel used can be reduced, and therefore costs can be reduced.

[Brief explanation of drawings]

FIG. 1 shows the first part of the communication I/channel support device according to the present invention.
FIG. 2 is an enlarged sectional view of a part of the communication tunnel in FIG. 1, FIG. 3 is an enlarged longitudinal sectional view of the vicinity of the biological shielding wall in FIG. The diagram is IV- in Figure 3.
5 is a schematic longitudinal sectional view of the support device of the second embodiment; FIG. 6 is an enlarged sectional view of the vicinity of the living body shielding wall in FIG. 5; and FIG. 8 is a schematic vertical sectional view of the support device of the third embodiment; FIG. 9 is an enlarged sectional view of the vicinity of the concrete frame in FIG. 8;
The figure is a sectional view taken along the line X--X in FIG. 9, and FIG. 11 is a schematic longitudinal sectional view of conventional nuclear reactor equipment. 1... Reactor containment vessel, 2... Biological shielding wall, 3...
・Reactor pressure vessel, 4... pedestal, 6... diaphragm floor, 10... communication tunnel, 13...
Seal bellows, 20...Concrete frame. Applicant's agent Kiyoshi Inomata Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 9, Figure 10 Figure 1I

Claims (1)

[Scope of Claims] 1. The reactor containment vessel is divided into a dry well section and a subrepression chamber section by a diaphragm floor provided around the pedestal, and the pedestal In a nuclear reactor facility having a communication tunnel that communicates the inside of the reactor containment vessel with the outside of the reactor containment vessel, the communication tunnel is composed of two pipes arranged coaxially and in series with an axial gap between them, and A communication tunnel in nuclear reactor equipment, characterized in that one ends of adjacent sides of two pipes are interconnected with a seal bellows, and the other ends of the two pipes are fixed to the pedestal and the reactor containment vessel. support device. 2. The reactor containment vessel is surrounded by a biological shielding wall, and the outer end of the communication tunnel is supported by the biological shielding wall so as to be movable in the axial direction. A support device for a communication tunnel according to scope 1. 3. The reactor containment vessel is a concrete containment vessel having a concrete frame, and the outer end of the communication tunnel is fixedly supported by the concrete frame. Support device for communication tunnel.