JPS62116295A - Housing facility for nuclear reactor - 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 invention] The present invention relates to reactor containment equipment for a nuclear power plant.

[Technical background of the invention]

Hereinafter, a conventional example of nuclear reactor containment equipment will be explained with reference to FIGS. 5 and 6. Here, FIG. 5 shows a longitudinal sectional view of a conventional nuclear reactor containment facility, and FIG. 6 shows a sectional view taken along the line A--A in FIG. 5. In Figures 5 and 6, reactor containment vessel 1
A reactor pressure vessel 2 is housed inside. This reactor pressure vessel 2 is supported by a reactor pressure vessel pedestal 4 provided on a bottom concrete 3 provided at the lower part of the reactor containment vessel 1. A reactor shielding wall 5 is provided above the reactor pressure vessel pedestal 4 to surround the reactor pressure vessel 2. A torus chamber 6 with a rectangular cross section is provided around the reactor containment vessel 1,
A suppression chamber 8 containing pool water 7 is installed within the torus chamber 6. The reactor containment vessel 1 and the suppression chamber 8 are communicated through a vent pipe 9, and a vent ladder 10 is installed at the tip of the vent pipe 9.
is formed and this vent header 10 has its tip connected to the pool water 7
A downcomer 11 which is open inside is provided. This reactor containment equipment guides the steam generated in the reactor pressure vessel 2 during a loss of coolant accident or when a relief stabilization valve (not shown) is activated into a suppression chamber 8 and condenses it in boule water 7. It is configured to allow

[Problems with background technology]

In the above configuration, the space above the h-rus chamber has conventionally been used as a piping space, but since the circular suppression chamber is housed in the torus chamber with a rectangular cross section, there is some space that cannot be used effectively. However, there were problems with space efficiency. Furthermore, concrete is poured in the reactor containment vessel C up to the lower end of the vent pipe opening so that cooling water such as spray generated within the reactor containment vessel returns to the suppression chamber. The volume of the space at the bottom of the reactor containment vessel where concrete is poured is considerable, and although this space has traditionally been used to install high-conductivity and low-conductivity waste liquid sump, it is only a small amount. It was just a space, and there was a desire to reduce this space.

[Object of the Invention] The object of the present invention is to reduce the size of the unused space that existed in the past, improve the storage capacity within the building, and reduce the height of the building to improve its earthquake resistance. The objective is to obtain a nuclear reactor containment facility that can improve performance.

[Summary of the invention]

The present invention provides a reactor pressure vessel that houses a reactor core, a reactor containment vessel that houses this reactor pressure vessel, a suppression chamber that is arranged around this reactor containment vessel and that contains cooling water, and In a reactor containment facility consisting of a vent pipe with one end open to cooling water held in a suppression chamber and the other end connected to the reactor containment facility,
The suppression chamber is formed of reinforced concrete with a rectangular cross section, and has a liner structure in which a liner is stretched inside the nuclear reactor containment facility.

[Embodiments of the invention]

A first embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

Here, FIG. 1 shows a longitudinal cross-sectional view of a nuclear reactor containment facility according to a first embodiment of the present invention, and FIG. 2 shows a cross-sectional view of the suppression chamber shown in FIG. 1.

In FIGS. 1 and 2, the reactor containment vessel 20 has a flat bottom, eliminates the extra space that was present in conventional containment vessels, and has a lower overall height. This reactor containment vessel 20
The containment vessel structure is made of reinforced concrete with a liner lined inside. A bottom concrete 12 is provided in the lower part of the reactor containment vessel 20, and a reactor pressure vessel pedestal 14 that supports the reactor pressure vessel 13 is provided on the bottom concrete 12. A reactor shielding wall 15 is provided at the second part of the reactor pressure vessel pedestal 14 to surround the reactor pressure vessel 13. A suppression chamber I6 having a hole-shaped cross section is provided around the reactor containment vessel 20, and the suppression chamber 16 has a structure made of reinforced concrete with a liner lined inside. The reactor containment vessel 20 and the suppression chamber 16 are connected to a vent pipe 17.
A vent header 18 is formed at the tip of the vent 1-pipe 17, and the vent header 18 is provided with a downcomer 21 whose tip is open into the pool water 19. In the present invention, piping (not shown) that was conventionally installed in the torus chamber is housed in a separate piping space above the suppression chamber 16.

Note that the relative position of the equipment loading/unloading hatch (not shown) with respect to the reactor containment vessel 20 is approximately the same as in the conventional example.

With the above configuration, according to the present invention, it is possible to reduce the size of the reactor containment vessel by eliminating unused space. In particular, the overall height of the containment vessel can be reduced by changing the suppression chamber from the conventional circular cross section to a rectangular cross section, reducing the space at the bottom of the drywell, and making the bottom flat overall. Therefore, it is possible to not only improve earthquake resistance but also shorten the construction period and reduce costs.

Furthermore, by making the inner body of the suppression chamber 2 rectangular, the storage capacity within the building is improved and the size of the entire building can be reduced.

Next, a second embodiment of the present invention will be described with reference to FIG.

Here, FIG. 3 shows a longitudinal sectional view of a nuclear reactor containment facility according to a second embodiment of the present invention. In FIG. 3, the same parts as in FIG. 1 are designated by the same reference numerals, and the explanation of the structure of the parts will be omitted. In FIG. 3, the suppression chamber 16 has the same structure as the first embodiment of the present invention shown in FIG. 1, and the reactor containment vessel 22 is a self-supporting steel containment vessel.

In the above configuration, the gap between the reactor containment vessel 22 and the suppression chamber 16 is large (approximately 800 mm), and the gap with the upper reactor building (not shown) is the same value as before (approximately 5 On++n). shall be.

This eliminates the need for LOCA (Loss of Coolant Accident) measures by detecting leaks before pipes break and requesting countermeasures in advance. The so-called LBB (Leak Bef)
This is a proposal based on the assumption that (ore l1reak) holds only for SUS piping. In this case, by making the RT-IR (Reactor Residual Heat Removal System) piping in the lower part of the reactor containment vessel 22 stainless steel, the large diameter piping is made of SU.
Since it is an S piping, the establishment of LBB eliminates the need for the reactor shielding wall to have a backup effect for the containment vessel, allowing for a large gap.

According to the second embodiment of the present invention with the above configuration, the first
Effects similar to those of the embodiment can be obtained.

Next, a third embodiment of the present invention will be described with reference to FIG.

Here, FIG. 4 shows a longitudinal sectional view of a reactor containment facility according to a third embodiment of the present invention. Note that in FIG. 4, the same parts as in FIG. The gap is similarly large (approximately 800 mm). This shows a case where the LBB shown in the second embodiment also holds true for carbon steel (C8) piping.

In this case, it is possible to have a large gap all the way to the top, and in addition to the same effect as the first embodiment, the reactor building can be constructed in parallel with the reactor containment vessel construction, further shortening the process. can do.

〔Effect of the invention〕

According to the present invention, the suppression chamber in the reactor containment facility is formed of reinforced concrete with a rectangular cross-section and a liner structure inside, so the bottom of the reactor containment vessel can be lowered flat, making it possible to reduce the size and improve durability. Good malleability can be achieved.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a longitudinal cross-sectional view of a nuclear reactor containment facility showing a first embodiment of the present invention, FIG. 2 is a cross-sectional view of the suppression chamber shown in FIG. 1, and FIG. FIG. 4 is a vertical cross-sectional view of reactor containment equipment showing the second and third embodiments of the present invention, FIG. 5 is a vertical cross-sectional view of reactor containment equipment according to a conventional example, and FIG. It is an AA arrow view of. 12... Bottom concrete 1, 13... Reactor pressure vessel 14... Reactor pressure vessel pedestal 15... Reactor shielding wall 16... Suppression chamber = 8- I7... Vent pipe 18 ...Vent header 19...Pool water 20.22...Reactor containment vessel 21...Downcomer 23...Reactor building agent Patent attorney Nori Chika Yudo Hirofumi Mitsumata

Claims (1)

[Claims] (1) A reactor pressure vessel that houses the reactor core, a reactor containment vessel that houses this reactor pressure vessel, a suppression chamber that is placed around this reactor containment vessel and that holds cooling water inside, and this suppression chamber. In a reactor containment facility consisting of a vent pipe with one end open to cooling water held in a chamber and the other end connected to the reactor containment vessel,
A nuclear reactor containment facility characterized in that the suppression chamber is made of reinforced concrete with a rectangular cross section, and has a liner structure with a liner stretched inside.