JPS606896A - Housing 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 the Invention] The present invention relates to an atomic reactor containing a MARJ (type-II or MARK-II modified type) reactor containment vessel having an upper conical dry well and a lower cylindrical suppression chamber. Regarding the furnace building.

[Technical background of the invention]

This type of reactor building is formed, for example, as shown in FIG.

This reactor building 1 is formed by incorporating a MARK-JT type reactor containment vessel 2 inside a building shell wall 3. The reactor containment vessel 2 is made of steel plate and is divided by an internal diaphragm floor 4 into an upper conical dry well 5 and a lower cylindrical suppression chamber 6. A pressure container pedicle 7 is provided in the center of the reactor containment vessel 2, and a reactor pressure vessel 8 is installed above it. In addition, diaphragm floor 4
A large number of vent pipes 9, 9 communicating between the pigeon dry well 5 and the suppression chamber (6) are suspended, the lower ends of which are opened into the suppression chamber water.

[Problems with background technology]

Although the reactor containment vessel 2 is made of steel, the thickness of the steel plate is thin compared to its diameter, so it is considered to be a thin film as a whole. Therefore, in the case of a structural design that absorbs seismic force by increasing the deformation of the reactor building 1 during a major earthquake, the lower part of the reactor containment vessel 2, especially the suppression chamber part, should be There was a possibility of buckling due to forced deformation from 3.

This is because there is a space 10 between the reactor containment vessel 2 and the building shell wall 3 in the suppression chamber 6 part.
This is thought to be caused by the large deformation of the lower part of the reactor containment vessel 2, which is a thin film.

This space 10 is a space for workers to enter and work during the construction of the reactor building 1 and the building shell wall 3, and cannot be omitted.

Suppression chamber water is stored in the suppression chamber 6 as a water source for the emergency core evacuation system, so if the lower part of the reactor containment vessel 2 buckles, water will leak and the emergency water source will be used. There is a risk that the parts may become separated.

Therefore, it is necessary to prevent the lower part of the reactor containment vessel 2 from buckling even in the event of a major earthquake.

[Purpose of the invention]

The present invention has been made with these points in mind, and it is an object of the present invention to provide a highly safe nuclear reactor building that does not buckle at the bottom of the reactor containment vessel even during an earthquake.

[Outline of the invention]

The reactor building of the present invention has a reactor containment area. : Even if there is less capacity, the space between the suppression chamber and the building shell wall is filled with sand to reduce the impact from the reactor building at the bottom of the reactor containment vessel during an earthquake, and to prevent buckling. It is characterized by being formed to prevent.

[Embodiments of the invention]

Hereinafter, the present invention will be described with reference to the embodiments shown in FIGS. 2 and 31.

In FIGS. 2 and 3, the same parts as in FIG. gB1 are given the same reference numerals.

In this embodiment, sand 11 having a function of λ is filled as a cushion 2 in the entire space 10 between the suppression chamber 6 of the reactor containment vessel 2 and the building shell wall 3. Further, the amount of sand 11 filled into this space 10 is preferably such that a predetermined free space is left so that the anti-sand 11 has fluidity to a certain extent and can fully exhibit its cushioning function. .

Next, the operation of this embodiment will be explained.

During an earthquake, the reactor building 1 and the reactor containment vessel 2 shake significantly. However, in this embodiment, since the sand 11 in the space 10 supports the reactor containment vessel 2 from the outside, the vessel 2 will not be significantly deformed or buckled due to the atoms 9>'', 1·K fit'. I won't wake you up.

In particular, during an earthquake, the shaking of the reactor Vt (house 1) is propagated to the reactor containment vessel 2, and stress is generated within the reactor containment vessel 2, but this is alleviated by the cushioning function of the sand 11, and the 3 and the reactor building 1 and are attenuated, the reactor containment vessel 2 is kept safe. The force pushing the containment vessel 2 outward is also effectively supported and relieved by the sand 11.

Therefore, buckling of the lower part of the reactor containment vessel is completely prevented.

Note that the sand 11 is applied not only to the space 10 but also to the reactor containment vessel 2.
It may be filled between the dry well part and the building shell wall.

〔Effect of the invention〕

Since the reactor building 1'-Lk+'+ of the present invention is constructed and operated in this manner, buckling at the bottom of the reactor containment vessel is reliably prevented in the event of an earthquake, and an emergency water source is provided separately. This has the advantage of being highly safe as there is no leakage.

[Brief explanation of the drawing]

Figure 1 is a longitudinal section flI11 view showing a conventional reactor building;
Fig. 2 shows an embodiment of the reactor building of the present invention. H1t1 is along the line. 1... Reactor building, 2... Reactor containment vessel, 3...
・Building shell wall, 5°...Dry well section 6...The pressure chamber, 10...Space, 11...Sand. Applicant's agent Inomata Kiyoshi procedure amendment = (method) 1 eyebrow n158: 11 October 13th '4: i'i'l- Commissioner Aio Wakasugi 1,
Displaying $ items 1981 4”I'it'l' Ifsu 1 11th
3.932 No. 2, Name of the invention Reactor building 3, Relationship with the person making the amendment' case 'I'!'if'l Applicant (307) Tokyo Shibaura Electric Co., Ltd. (and 1 other person) Specification attached. Street clean @jru (no change in content).

Claims (1)

[Claims] 1. A nuclear reactor building in which a reactor containment vessel, in which a conical upper dry well and a cylindrical lower suppression chamber are connected, is housed within the building shell wall. A nuclear reactor building according to claim 1, wherein a space between at least a suppression chamber portion of the reactor containment vessel and a building shell wall is filled with sand. 2. Air space between the suppression chamber of the reactor containment vessel and the building shell wall! 2. The reactor building according to claim 1, wherein sand is filled leaving a predetermined space in the reactor building.