JP2700174B2 - Concrete containment vessel - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a concrete containment vessel made of concrete.

[Prior Art] A conventional containment vessel for a boiling water reactor has a hanging-shaped steel containment vessel 1 shown in FIG. 3 and a concrete containment vessel 2 shown in FIG. There is. In both cases, steel liners 5, 6 are provided inside the concrete walls 3, 4, respectively, to prevent radiation leakage.

By the way, in the steel reactor containment vessel 1, a predetermined clearance 7 is provided between the concrete wall 3 and the liner 5.
The strength of the liner 5 is considered as a structural member. However, in the concrete reactor containment vessel 2, the concrete wall 4 and the liner 6 are provided.
There is no particular clearance between the liner 6 and the liner 6. 5 and fixed to the concrete wall 4 via an anchor 8 having a T-shaped cross section provided on the liner 6 shown in FIG. 5 is an arc-shaped flat bar fitted in the anchor 8 in a horizontal state, and 10 in FIGS. 3 and 4 is a reactor pressure vessel.

[Problems to be solved by the invention]

However, in the above-described concrete containment vessel, since the liner 6 is fixed to the concrete wall 4 via the anchor 8, the liner 6 can expand freely when exposed to high temperatures. 6, an unbalanced load in the directions of arrows A and B shown in FIG. 6 acts between the anchors 8, and the liner 6 moves between the anchors 8 from the ideal position shown by the broken line in FIG. As a result, the fixing portion between the concrete wall 4 and the anchor 8 may be broken.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a concrete containment vessel which solves the above-mentioned problems, maintains airtightness, and allows the liner to expand even when the temperature rises and falls, and has sufficient safety.

[Means for solving the problem]

The present invention relates to a concrete structure in which an anchor having a T-shaped cross section is fixed to the rear side of a liner made of a steel plate, and the anchor is embedded in a concrete wall to integrally fix the liner to the inner surface of the concrete wall. A containment vessel made of a material having flexibility, such as rubber, provided on the back side of the liner so as to cover the entire back surface of the liner and the entire surface of the anchor; A part is interposed between the concrete wall and the liner and the anchor.

(Operation)

When the reactor operates, the liner heats up and expands thermally, but the thermal deformation of the liner is absorbed by the deformation absorbing part that is entirely interposed between the liner and the concrete wall,
Therefore, no thermal stress is generated due to restraint of the thermal deformation, and destruction due to the thermal stress can be prevented. In particular, since the deformation absorbing portion is attached so as to cover not only the entire back surface of the liner but also the entire surface of the anchor, thermal deformation in each direction of the liner and anchor, that is, thermal deformation not only in the in-plane direction but also in the out-of-plane direction. Is effectively absorbed.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In this embodiment, the same parts as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted. In this embodiment, the outer surface of the liner 6, the anchor 8 provided integrally with the liner 6, and the flat bar 9 is coated with a heat-resistant rubber coating as shown in FIG. And a coating rubber layer (deformation absorbing portion) 11 provided so as to cover the entire outer surface of the flat bar 9. This coating rubber layer 11 can be provided by means such as spraying, sticking, or a combination of spraying and sticking.

Thus, the liner 6 provided with the anchor 8 and the flat bar 9 and coated with rubber is used as a substitute for the formwork.
The concrete wall 4 is integrally cast on the outside of the rubber-coated liner 6. The thickness of the coating rubber layer 11 is about 3-4 mm.

Therefore, the reactor operates and the liner 6, the anchor 8,
When the temperature of the flat bar 9 rises, they expand, but the coating rubber layer 11 is compressed by the liner 6, the anchor 8, and the flat bar 9, and the stress generated in the liner 6 is reduced by the anchor 8, the flat bar 9, and the coating rubber. It is transmitted to the concrete wall 4 via the layer 11. Since the coating rubber layer 11 is compressed in this manner, the liner 6, the anchor 8, and the flat bar 9 are allowed to expand freely. In particular, the thermal deformation of the liner 6 is not only in the in-plane direction but also in the out-plane direction. The same applies to the anchor 8 and the flat bar 9 without being restrained.

As described above, according to this embodiment, the liner 6, the anchor 8, and the flat bar 9 can freely expand even when the temperature is raised, so that no thermal stress is generated, and therefore, destruction due to the thermal stress is prevented. This can be prevented from occurring.

FIG. 2 shows the relationship between the temperature at the time of the temperature rise and the compressive stress acting on the rubber-coated liner 6 in the circumferential direction. In FIG. 2, L represents the degree of compressive stress of the liner 6 coated with rubber, dashed line M represents the rigidity of the concrete wall 4, and dashed line N represents the coating rubber layer.
11 shows the rigidity of each.

〔The invention's effect〕

As described above, according to the present invention, the flexible deformation absorbing portion is provided on the back side of the liner so as to cover the entire back surface of the liner and the entire surface of the anchor, so that airtightness is maintained and leakage of radioactivity is maintained. Of course, when the temperature of the liner rises and is thermally deformed, the deformation absorbing part deforms to restrain thermal deformation of the liner and anchor in each direction. Therefore, it is possible to prevent the fixed portion between the concrete wall and the anchor from being broken, and to obtain sufficient safety.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view of a part of a concrete reactor containment vessel showing one embodiment of the present invention, and FIG. 2 is a view showing the temperature rise and the compressive stress acting in the circumferential direction of a rubber-coated liner. FIG. 3 is a partially omitted longitudinal front view of a boiling water reactor building in which a conventional steel reactor containment vessel is shown, and FIG. 4 is a conventional concrete reactor containment. FIG. 5 is a front view, partially omitted, of a boiling water reactor building showing a vessel, FIG. 5 is a perspective view showing a liner, anchor, and flat bar of a conventional concrete containment vessel, and FIG. 6 is a conventional view. FIG. 4 is a partial cross-sectional plan view showing a state where the liner of the concrete containment vessel is bent. 3,4 ... Concrete wall, 6 ... Liner, 8 ... Anchor, 11 ... Coated rubber layer (deformation absorbing part).

Claims (1)

(57) [Claims] An anchor having a T-shaped cross section is fixed to the back side of a steel sheet liner, and the anchor is embedded in a concrete wall to integrally fix the liner to the inner surface of the concrete wall. A concrete containment vessel, wherein a deformation absorbing portion made of a flexible material such as rubber is provided on the back side of the liner so as to cover the entire back surface of the liner and the entire surface of the anchor. A containment vessel made of concrete, wherein an absorbing part is interposed between the concrete wall and the liner and the anchor.