JPH0741495U - Pedestal structure of reactor pressure vessel in concrete containment vessel - Google Patents

Abstract

(57) [Summary] [Purpose] To enable easy and quick installation of shear plates, processing of the upper outer cylinder, assembly and welding. [Arrangement] An upper intermediate cylinder 13 is arranged concentrically with an upper inner cylinder 11 of the reactor pressure vessel pedestal in a portion supporting a diaphragm floor of an upper end portion of the reactor pressure vessel pedestal that supports and surrounds the reactor pressure vessel. Then, a plurality of vertical ribs 19 are radially attached to the outer periphery of the upper intermediate cylinder 13, and a polygonal upper outer cylinder 21 in which the radially outer ends of the vertical ribs 19 project from the opposing ends. The plate-shaped member 20 is attached between the adjacent vertical ribs 19 so that it may be formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a reactor pressure vessel pedestal structure for a concrete reactor containment vessel.

[0002]

[Prior art]

 FIG. 4 shows an example of a concrete reactor containment vessel in which a reactor pressure vessel is housed. 1 is a concrete reactor containment vessel, 2 is a concrete nuclear reactor containment vessel. The reactor pressure vessel 3 is provided so as to support the reactor pressure vessel 2 via an annular pedestal 3a which is erected at a substantially central portion of the concrete reactor containment vessel 1 and which is provided at a required position on the inner circumference. Is a substantially cylindrical reactor pressure vessel pedestal, and the lower portion of the reactor pressure vessel 2 is inserted into the pedestal 3 substantially concentrically so as to be surrounded by the reactor pressure vessel pedestal 3.

Reference numeral 4 denotes an annular diaphragm floor installed between the inside of the side wall 1 a of the concrete reactor containment vessel 1 and the upper end of the reactor pressure vessel pedestal 3. Reference numeral 5 denotes the reactor pressure vessel 2. It is a reactor shield wall that is erected on the upper end of the reactor pressure vessel pedestal 3 so as to surround it in the direction.

As shown in FIG. 5, the reactor pressure vessel pedestal 3 basically has a structure in which concrete 3c is filled in a multiple cylindrical frame 3b made of steel plate and supports a diaphragm floor 4 at the upper end of the frame 3b. Details of the portion to be performed are shown in FIGS.

In FIGS. 5 to 8, 6 is a substantially cylindrical inner cylinder made of a steel plate which is arranged concentrically with the reactor pressure vessel 2 so as to form an inner wall of the pedestal 3 of the reactor pressure vessel, and 7 is an atom. A substantially cylindrical outer cylinder made of a steel plate, which is arranged concentrically with the inner cylinder 6 so as to constitute the outer wall of the pedestal 3 of the reactor pressure vessel, 8 is larger in diameter than the inner cylinder 6 and smaller in diameter than the outer cylinder 7. In addition, a substantially cylindrical intermediate cylinder made of a steel plate arranged concentrically with the inner cylinder 6, 9 is a substantially cylindrical intermediate cylinder made of a steel plate having a diameter larger than that of the intermediate cylinder 8 and smaller than that of the outer cylinder 7. Is installed substantially horizontally from the inner cylinder 6 to the outer cylinder 7 so as to cover the tops of the inner cylinder 6, the intermediate cylinders 8, 9 and the outer cylinder 7, and is welded to the tops of the respective cylinders 6, 7, 8, 9 , A substantially annular support plate made of a steel plate for supporting the end of the diaphragm floor 4 on the reactor pressure vessel 2 side from below.

Reference numeral 11 denotes an upper inner cylinder made of a steel plate which is formed on the upper surface of the support plate 10 so as to have a diameter substantially the same as that of the inner cylinder 6 and to be located above the inner cylinder 6, and 12 is the intermediate cylinder. An upper outer cylinder made of a steel plate that is formed on the upper surface of the support plate 10 and has a diameter substantially the same as that of the cylinder 9 and is located above the intermediate cylinder 9 and has a diameter substantially the same as that of the intermediate cylinder 8. Is formed on the upper surface of the support plate 10 so as to be located above the intermediate cylinder 8 and is welded to the upper intermediate cylinder made of steel plate, and 14 denotes the tops of the upper inner cylinder 11, the upper intermediate cylinder 13, and the upper outer cylinder 12. It is a ceiling plate that is placed substantially horizontally from the upper inner cylinder 11 to the upper outer cylinder 12 so as to cover it, and is welded to the tops of the cylinders 11, 12, and 13.

As shown in FIGS. 6 and 7, between the upper inner cylinder 11 and the upper intermediate cylinder 13, plate-shaped vertical ribs 15 are formed in a radial shape with reference to the axial center of the upper inner cylinder 11. A plurality of these vertical ribs 15 are arranged on their inner ends on the outer circumference of the upper inner cylinder 11, their outer ends on the inner circumference of the upper intermediate cylinder 13, their lower ends on the upper surface of the support plate 10, and their upper ends on the ceiling plate. Are welded to the lower surface of the grate 14, respectively.

Further, a vertical rib 16 is arranged between the upper intermediate cylinder 13 and the upper outer cylinder 12 so as to be located on a radial extension line of the vertical rib 15, and an inner end of the vertical rib 16 is disposed. Is welded to the outer periphery of the upper intermediate cylinder 13, the outer end is welded to the inner periphery of the upper outer cylinder 12, the lower end is welded to the upper surface of the support plate 10, and the upper end is welded to the lower surface of the ceiling plate 14.

Furthermore, a shear plate 17 is arranged on the outer circumference of the upper outer cylinder 12 so as to be positioned on the extension radial line of the vertical rib 16, and the inner end of the shear plate 17 is arranged on the outer circumference of the upper outer cylinder 12. The lower end is welded to the upper surface of the support plate 10 and the upper end is welded to the lower surface of the ceiling plate 14, and the upper surface of the support plate 10 on the diaphragm floor 4 side is positioned on the extension radiation line of the shear plate 17. A flat plate shaped plate 18 is arranged and welded.

Further, although not shown, a radial member is also provided on the diaphragm floor 4, and the member engages with the shear plates 17 and 18.

Therefore, even if a horizontal force for rotating the diaphragm floor 4 in the circumferential direction during an earthquake acts on the diaphragm floor 4, the horizontal force is transmitted to and supported by the shear plates 17, 18. Therefore, the diaphragm floor 4 does not rotate.

[0012]

[Problems to be solved by the device]

 However, in the reactor pressure vessel pedestal structure in the concrete reactor containment vessel as described above, a large number of shear plates 17 must be welded to the outer circumference of the upper outer cylinder 12, so that a large amount of mounting work is required. It takes time and labor, and since the upper outer cylinder 12 has a cylindrical shape, it takes a lot of time and labor for various work such as plate bending, assembling and welding of the upper outer cylinder 12. .

In view of the above-mentioned circumstances, the present invention provides a concrete reactor for a containment vessel for a concrete nuclear reactor which enables various operations such as attachment of a shear plate, processing of an upper outer cylinder, assembling and welding, to be performed easily and quickly. It is intended to provide a pressure vessel pedestal structure.

[0014]

[Means for Solving the Problems]

 The present invention is provided with a cylindrical reactor pressure vessel pedestal that surrounds and supports a reactor pressure vessel in a substantially concentric manner, and supports the inner peripheral side of a diaphragm floor on the outer peripheral side of the upper end. At the upper end of the cylinder frame of the reactor pressure vessel pedestal, there is a vertical rib that also serves as a shear plate and has one end connected to the cylinder frame and the other end extending away from the reactor pressure vessel. It is arranged so as to be radial with respect to the center, and a plate-shaped member is arranged between the vertical ribs adjacent in the circumferential direction of the reactor pressure vessel pedestal so that the other ends of the vertical ribs project toward the diaphragm floor. Then, both sides of the plate-shaped member in the reactor pressure vessel pedestal circumferential direction are connected to the vertical ribs to form an outer cylinder having a polygonal planar shape.

[0015]

[Action]

 Even if a horizontal force acts on the diaphragm floor in the circumferential direction, it does not rotate in the circumferential direction because the diaphragm floor is restricted from moving in the circumferential direction by a specific rib that also serves as a shear plate.

Since the vertical ribs also function as a shear plate, it is not necessary to weld a large number of shear plates, and since the outer cylinder has a polygonal planar shape, bending of the outer cylinder plate is unnecessary, and assembly, welding, etc. The time and labor required for the work are reduced.

[0017]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows an embodiment of the present invention, and is a plan view of a frame 3b near the upper end of a pedestal of a reactor pressure vessel, FIG. 2 is an enlarged view of part II of FIG. 1, and FIG. It is a II I-III direction arrow line view of FIG. However, the same reference numerals as those in FIGS. 5 to 8 indicate the same items.

In the figure, 19 is a vertical rib that also serves as a shear plate, and the vertical rib 19 is on the radial extension line of the vertical rib 15 radially arranged between the upper inner cylinder 11 and the upper intermediate cylinder 13. The vertical ribs 19 are disposed outside the upper intermediate cylinder 13 so that the inner ends of the vertical ribs 19 are on the outer periphery of the upper intermediate cylinder 13, the lower ends of the vertical ribs 19 are on the upper surface of the support plate 10, and the lower surfaces thereof are on the ceiling plate 14. It is welded to the bottom surface.

Further, between the vertical ribs 19 adjacent to each other in the circumferential direction of the upper intermediate cylinder 13, a plate-shaped member 20 made of a steel plate is placed so as to be located on the upper intermediate cylinder 13 side from the radial outer end of each vertical rib 19. It is arranged so as to have a regular polygonal shape with respect to the center of the upper intermediate cylinder 13 in plan view, and both ends of each plate-shaped member 20 in the circumferential direction of the upper intermediate cylinder 13 are welded to the vertical ribs 19 and each plate-shaped member 20. The lower end is welded to the upper surface of the support plate 10 and the upper end is welded to the lower surface of the ceiling plate 14.

Then, on the outer periphery of the upper end of the frame 3b of the pedestal 3 of the reactor pressure vessel, a regular rib-shaped upper outer cylinder in which vertical ribs 19 radially protrude from the opposite ends of the adjacent plate-shaped members 20 is formed. 21 are arranged outside the upper intermediate cylinder 13 so as to be concentric with each other.

The upper outer cylinder 21 has a regular polygonal shape, and the vertical ribs 19 are projected radially between the facing ends of the adjacent plate-shaped members 20, so that the vertical ribs 19 project from the upper outer cylinder 21. It is not necessary to attach a large number of shear plates 17 (see FIGS. 6 and 7) to the outer peripheral surface of the upper outer cylinder 12 by welding as in the conventional case because the portion can have a function as a shear plate. Assembling of the pressure vessel pedestal 3 can be shortened, and since the upper outer cylinder 21 does not need to have a cylindrical shape, plate bending processing of the upper outer cylinder 21 is not necessary and the time required for assembling and welding work. It is economical because it can reduce labor.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0024]

[Effect of device]

 As described above, according to the reactor pressure vessel pedestal structure in the concrete reactor containment vessel of the present invention, the pedestal structure of the reactor was conventionally attached to the outer circumference of the outer cylinder in order to receive the horizontal turning force acting on the diaphragm floor. A large number of shear plates can be eliminated to reduce the number of members used, and it is not necessary to make the outer cylinder of the upper end part into a polygonal shape, so that it is not necessary to bend the plate in this part. It is possible to reduce various operations such as assembling and welding, improve productivity, and have an excellent effect of being economical.

[Brief description of drawings]

FIG. 1 is a plan view of a frame used for a pedestal structure of a reactor pressure vessel in a concrete reactor containment vessel of the present invention.

FIG. 2 is an enlarged view of a part II in FIG.

FIG. 3 is a view taken along the line III-III in FIG.

FIG. 4 is a cross-sectional view showing an outline of a concrete reactor containment vessel that houses a reactor pressure vessel.

5 is an enlarged cross-sectional view of a V part in FIG.

FIG. 6 is a plan view of a frame used for a pedestal structure of a reactor pressure vessel in a conventional concrete reactor containment vessel.

FIG. 7 is an enlarged view of a VII portion in FIG.

8 is a VIII-VIII direction arrow view of FIG. 7. FIG.

[Explanation of symbols]

 1 Concrete Reactor Containment Vessel 2 Reactor Pressure Vessel 3 Reactor Pressure Vessel Pedestal 4 Diaphragm Floor 13 Upper Intermediate Cylinder (Cylinder) 19 Vertical Rib 20 Plate Member 21 Upper Outer Cylinder (External Cylinder)

Claims (1)

[Scope of utility model registration request] 1. A cylindrical reactor pressure vessel pedestal for enclosing and supporting a reactor pressure vessel in a substantially concentric manner and supporting an inner peripheral side of a diaphragm floor on an outer peripheral side of an upper end thereof, the pedestal comprising: At the upper end of the cylinder frame of the reactor pressure vessel pedestal, a vertical rib that also serves as a shear plate and has one end connected to the cylinder frame and the other end extending away from the reactor pressure vessel is located at the center of the axis of the reactor pressure vessel. Is arranged to be radial with respect to, between the vertical ribs adjacent to the circumferential direction of the reactor pressure vessel pedestal, the plate-shaped member is arranged so that the other end of the vertical ribs is projected to the diaphragm floor side, A reactor pressure vessel pedestal structure in a concrete reactor containment vessel, characterized in that the plate-shaped member is connected to the longitudinal ribs on both sides in the circumferential direction of the reactor pressure vessel pedestal to form an outer cylinder having a polygonal planar shape. Structure.