JPH04102497U - Earthquake-resistant structure of shielding wall - Google Patents

Abstract

(57) [Summary] [Purpose] This study relates to the seismic structure of a shielding wall equipped with a stabilizer that suppresses the vibrations of a cylindrical shielding wall surrounding the outer periphery of a reactor pressure vessel during an earthquake. It is possible to obtain an earthquake-resistant structure that can maintain sufficient rigidity and support a stabilizer even when a horizontal load is applied in any direction. [Configuration] In an earthquake-resistant structure of a shielding wall in which the outer periphery of the reactor pressure vessel is covered with a cylindrical shielding wall installed upright on the diaphragm floor, and the upper end of the shielding wall is fixed to the top slab via a stabilizer, the top slab A cylindrical auxiliary shielding wall having a diameter larger than the outer diameter of the shielding wall is attached to the lower surface of the stabilizer, and a cylindrical auxiliary shielding wall having a diameter larger than the outer diameter of the shielding wall is attached to the stabilizer. It is characterized by having the following.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

In this invention, the shielding wall covering the outer periphery of the reactor pressure vessel is attached to the top via a stabilizer. Regarding the earthquake-resistant structure of shielding walls fixed to slabs.

0002

[Conventional technology]

The reactor containment vessel that houses the reactor pressure vessel has an outer shell made of concrete. There are things that are formed in the body.

0003 As shown in FIG. 4, the reactor containment vessel 1 has a cylindrical outer circumference made of concrete. Wall 2 is erected on a foundation (not shown), and a concrete top is placed on top of it. A push slab 3 is provided.

0004 In addition, in the center of the reactor containment vessel 1, a cylindrical reactor pressure vessel 4 is installed as a pedestal. The top slab 3 is located above the reactor pressure vessel 4. A lid portion 6 is provided to close off the empty space.

[0005] Between the reactor pressure vessel 4 and the outer peripheral wall 2 and between the diaphragm floor 7 and the top Piping (not shown) such as a main steam pipe connected to the pressure vessel 4 is arranged between the pipe 3 and the pressure vessel 4. An upper dry well 8 is formed in which a die is placed under the upper dry well 8. A suppression chamber 9 is formed below the yaphram floor 7.

[0006] There is a shield between the reactor pressure vessel 4 and the upper dry well 8 to shield radioactivity. A wall 10 is provided, and this shielding wall 10 has a cylindrical shape surrounding the reactor pressure vessel 4. is formed and is erected on the diaphragm floor 7 located on the pedestal 5. There is.

[0007] At the upper end of this shielding wall 10, a main steam pipe or the like extends upwardly and penetrates. The lower ends of the auxiliary shielding walls 11 are connected, and the upper ends of the auxiliary shielding walls 11 are connected to each other. Although it extends almost to the bottom of the top slab 3, in consideration of thermal expansion, its upper end is free.

[0008] For this reason, when building nuclear power generation facilities in high seismic zone areas, the shielding wall 10 is It is necessary to install earthquake-resistant structures to suppress vibrations during earthquakes.

[0009] Therefore, in the past, the above-mentioned earthquake-resistant structure was constructed using the top slab as shown in Figs. 3 with anchor bolts 12, etc., and below it, along the outer periphery of the shielding wall 10. A truss member 13 extending in a V-shape, and a truss member 13 provided at the lower end of the truss member 13 The shielding wall 10 slides into contact with the upper outer peripheral surface of the thermally expanded shielding wall 10 during an earthquake. A stabilizer 14 that suppresses vibrations in the horizontal direction is considered. there was.

0010 This earthquake-resistant structure has four stabilizers in contact with the outer peripheral surface of the shielding wall 10, as shown in A riser 14 is provided, and the stabilizer 14 stabilizes the radial direction of the shielding wall 10 due to thermal expansion. While allowing movement, in the event of an earthquake, the horizontal load from the shielding wall 10 is transferred to the truss member. 13 to the top slab 3 to suppress the vibration of the shielding wall 10. ing.

[0011]

[Problem that the idea aims to solve]

However, in the above case, as shown in FIG. 14 is supported by a truss member 13 formed in a V shape, and during an earthquake, the shielding wall 10 Since this truss member 13 receives the horizontal load from The rigidity of the truss member 13 may vary depending on the direction of action of the horizontal load on the vibrating shield wall 10. It turned out that there was a problem with adding up.

0012 Therefore, this invention was devised to solve the above problems, and its purpose is to , sufficient rigidity to handle the horizontal load from the shielding wall that vibrates during an earthquake in any direction. An object of the present invention is to provide an earthquake-resistant structure for a shielding wall that can support a stabilizer while maintaining its properties.

[0013]

[Means to solve the problem]

In order to achieve the above purpose, the present invention has developed the outer periphery of the reactor pressure vessel to be It is covered with a cylindrical shielding wall installed on the floor, and the top end of the shielding wall is connected via a stabilizer. In the earthquake-resistant structure of the shielding wall fixed to the top slab, the above-mentioned shielding wall is fixed to the top slab. A cylindrical auxiliary shielding wall larger than the outer diameter of the shielding wall is hung, and the auxiliary shielding wall and the above shielding The above-mentioned stabilizer is provided between the wall and the wall at an appropriate interval in the circumferential direction. It is what was done.

[0014]

[Effect]

According to the above configuration, the cylindrical shape is suspended from the top slab and surrounds the upper outer peripheral surface of the shielding wall. A secondary shielding wall is provided, and a stabilizer is installed between the secondary shielding wall and the shielding wall. This normally allows for radial thermal expansion of the shielding wall, and in the event of an earthquake, the auxiliary shielding wall The horizontal load of the shielding wall is borne by the top slab through the top slab, suppressing the vibration of the shielding wall. can do.

[0015] In addition, since the stabilizer is supported by a cylindrical auxiliary shield wall, the horizontal load is The stiffness of the auxiliary shielding wall for horizontal loads acting in any direction on the shielding wall. It is possible to maintain one's sexuality.

[0016]

【Example】

Hereinafter, one embodiment of the present invention will be described in detail based on the accompanying drawings.

[0017] 1 to 3 illustrate an embodiment of the seismic structure of a shielding wall according to the present invention.

[0018] In Figure 1, 1 is a concrete frame that houses the reactor pressure vessel 4. This reactor containment vessel 1 is made of concrete as shown in the figure. A cylindrical outer circumferential wall 2 made of wood is erected on a foundation (not shown), and on the top of it is a cylindrical outer peripheral wall 2. A top slab 3 made of concrete is provided.

[0019] In addition, in the center of the reactor containment vessel 1, a cylindrical reactor pressure vessel 4 is installed as a pedestal. The top slab 3 is located above the reactor pressure vessel 4. A lid portion 6 is provided to close off the empty space.

[0020] Between the reactor pressure vessel 4 and the outer peripheral wall 2 and between the diaphragm floor 7 and the top Piping (not shown) such as a main steam pipe connected to the pressure vessel 4 is arranged between the pipe 3 and the pressure vessel 4. An upper dry well 8 is formed in which a die is placed under the upper dry well 8. A suppression chamber 9 is formed below the yaphram floor 7.

[0021] There is a shield between the reactor pressure vessel 4 and the upper dry well 8 to shield radioactivity. A wall 15 is provided.

[0022] In this embodiment, the shielding wall 15 covers the reactor pressure vessel 4 as shown in the figure. a diaphragm floor formed in a tubular shape so as to surround it and located on the pedestal 5; 7 and its upper end is sufficiently spaced from the bottom surface of the top slab 3 and is free. is formed in the state of

[0023] Further, above the shielding wall 15, the upper end is anchored to the lower surface of the top slab 3. The main steam pipe is fixed with bolts 16, etc., and is suspended from it toward the shielding wall 15. An auxiliary shielding wall 17 is provided, through which the auxiliary shielding wall 17 is penetrated.

[0024] As shown in the figure, this auxiliary shielding wall 17 has an inner diameter that is sufficiently larger than the outer diameter of the shielding wall 15. It is formed into a cylindrical shape with a diameter, and its lower end has a gap between it and the outer periphery of the upper end of the shielding wall 15. 18 is formed.

[0025] A gap 18 between the shielding wall 15 and the auxiliary shielding wall 17 is provided with an appropriate gap along the circumferential direction. Stabilizers 19 are provided at intervals.

[0026] This stabilizer 19 is formed in a cylindrical shape, and its base is located at the inner periphery of the auxiliary shielding wall 17. While being fixed to the surface, the tip portion is in sliding contact with the outer peripheral surface of the thermally expanded shielding wall 15. It is set in.

[0027] In this embodiment, as shown in FIG. Although the example is shown in which 2 pieces are installed, the number, installation interval, etc. can be selected and determined as appropriate. good.

[0028] Next, the operation of the above embodiment will be explained.

[0029] A cylinder that hangs down from the top slab 3 and whose lower end surrounds the upper outer peripheral surface of the shielding wall 15 An auxiliary shielding wall 17 having a shape is provided, and in the gap 18 between the auxiliary shielding wall 17 and the shielding wall 15, By providing the stabilizers 19 at appropriate intervals along the circumferential direction, the Normally, thermal expansion in the radial direction of the shielding wall 15 is allowed, and during an earthquake, the shielding wall 15 vibrates. The horizontal load of It is possible to suppress the movement.

[0030] In addition, since the stabilizer 19 is supported by the cylindrical auxiliary shielding wall 17, the horizontal load acts on the supplementary shielding wall 17 in any direction, the supplementary shielding wall 17 The rigidity of the shielding wall 17 can be maintained and it will not be damaged during an earthquake.

[0031]

[Effect of the idea]

In summary, according to the present invention, the top slab is suspended from the top slab, and its lower end is the shielding wall. A cylindrical auxiliary shielding wall surrounding the outer circumferential surface of the By installing a stabilizer, the horizontal load from the shielding wall that vibrates during an earthquake is stabilized. Sufficient rigidity is maintained even when acting in any direction on the auxiliary shielding wall that supports the riser. It exhibits excellent effects such as being able to hold water.

[Brief explanation of drawings]

FIG. 1 is an overall view illustrating an embodiment of the earthquake-resistant structure of a shielding wall according to the present invention.

FIG. 2 is a sectional view taken along line AA in FIG. 1;

FIG. 3 is a sectional view taken along line BB in FIG. 2;

FIG. 4 is an overall diagram for explaining a conventional example.

FIG. 5 is a sectional view taken along line CC in FIG. 4;

FIG. 6 is a sectional view taken along line DD in FIG. 4;

[Explanation of symbols]

1 Reactor containment vessel 3 Top slab 4 Reactor pressure vessel 7 Dayahram Floor 15 Shielding wall 17 Auxiliary shielding wall 19 Stabilizer

Claims (1)

[Scope of utility model registration request] Claim 1. In an earthquake-resistant structure of a shielding wall in which the outer periphery of a reactor pressure vessel is covered with a cylindrical shielding wall erected on a diaphragm floor, and the upper end of the shielding wall is fixed to a top slab via a stabilizer, the above-mentioned A cylindrical auxiliary shielding wall larger than the outer diameter of the above-mentioned shielding wall is attached to the lower surface of the top slab and hangs down, and an appropriate interval is provided between the auxiliary shielding wall and the above-mentioned shielding wall in the circumferential direction. An earthquake-resistant structure of a shielding wall, characterized by being provided with the above-mentioned stabilizer.