JPS58225388A - Concrete container of 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 to which the invention pertains] The present invention relates to a concrete containment vessel for a nuclear reactor.

[Prior art and its problems] The structure of a concrete containment vessel for a nuclear reactor is shown in Figures 1 and 2.
The shape of the concrete containment vessel is cylindrical or conical, and its cross-sectional view is shown in FIG. is installed by anchor 3. The concrete part l serves as a structural member of the container.
Liner 2 has the role of maintaining airtightness.

A more detailed structure of the liner 2 and anchor 3 will be explained with reference to FIG. Generally, an axial anchor 3a and a circumferential anchor 3b are welded to the liner 2, and both anchors 3a and 3b are buried in the concrete part 1, so the inner surfaces of the liner 2 and the concrete 1 are in close contact. ing. In the figure, dotted lines indicate the positions where the axial anchors 3a and the circumferential anchors 3b are welded on the back surface of the liner.

Now, if the temperature inside the containment vessel rises for some reason and the liner section 2 becomes hotter than the concrete section 1,
Since the liner 2 and the concrete 1 are in close contact with each other by the anchors 3, compressive stress is generated in the liner 2. Compressive stress is also generated in the liner 2 when the concrete shrinks or when negative stress is generated on the inner surface due to bending deformation of the concrete wall. As mentioned above, since a thin steel liner 2 is generally used for concrete containment vessels for nuclear reactors,
It is conceivable that buckling as shown in FIG. 3 occurs due to the above compressive stress. In the figure, 2a shows a cross section of the buckled part of the liner, and the dotted line qualitatively shows the unevenness on the surface of the buckled liner 2. That is, due to buckling, a portion of the liner 2 separates from the concrete surface and undergoes significant bending deformation. If such a phenomenon occurs repeatedly, it will cause a reduction in the life of the liner 2.

[Summary of the Invention] The present invention relates to a concrete containment vessel for a nuclear reactor, in which part or all of a liner portion that constitutes a rotationally symmetrical surface inside the container is composed of a plurality of curved surfaces that are convex toward the inside of the rotationally symmetrical surface. The reason is that a liner is provided that completely prevents buckling deformation.

[Effects of the Invention] By using the concrete containment vessel for a nuclear reactor according to the present invention, the occurrence of thermal buckling can be prevented with an extremely simple configuration as described above.

[Embodiment of the Invention] The present invention will be described below with reference to an embodiment shown in FIG. FIG. 4 shows a liner section macroscopically constituting a rotationally symmetrical surface according to the present invention in a cross section perpendicular to the symmetry axis similar to that shown in FIG. It is composed of a plurality of small convex curved surfaces 6. ,
Now, considering the case where the temperature inside the containment vessel 7 rises,
As shown in FIG. 5, the curved surface 5 is thermally deformed so that it becomes more and more convex into the containment vessel. Therefore, uniform compressive stress is not generated within the curved surface, and thermal buckling never occurs.

Furthermore, since the bending rigidity of the curved surface 5, which reduces the thickness of the curved surface 5 for a given amount of thermal deformation, is reduced, the bending stress generated at the supporting fixed end 8 can also be reduced.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional example of a concrete containment vessel for a nuclear reactor, Fig. 2 is a view showing a conventional example of a liner and anchor, and Fig. 3 is a partial perspective view showing a buckling situation of the liner. figure,
FIG. 4 is a part according to the present invention. Fltsu, A5□4□. stomach. FIG. 1... Concrete part, 2... Liner, 3a, 3b
...Anchor, 4...Rotational symmetry surface. 5...Axis of symmetry, 6...Curved surface, 7...Inside of containment vessel,
8... Support fixed end. Figure 1 Figure 2 Figure 4 Figure 5 ζ 495-

Claims (1)

[Claims] In a concrete containment vessel having a liner part that constitutes a rotationally symmetrical surface, part or all of the liner part is composed of a curved surface that is convex in the direction toward the symmetry axis that is inside the rotationally symmetrical surface. A concrete containment vessel for a nuclear reactor, which is characterized by: