JPH0664195U - Diaphragm floor of containment vessel - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a diaphragm floor of a reactor containment vessel that can simplify the construction and shorten the construction period. The diaphragm floor 10 of the reactor containment vessel 1 of the present invention comprises a steel beam body 11 at a predetermined angle between an inner peripheral wall 1a of the reactor containment vessel 1 and an outer peripheral wall 3a of the pedestal 3.
And the seal plate 1 on the steel beam 11
2 is laid and the concrete layer 1 is placed on the seal plate 12.
It is constructed by placing three.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a diaphragm floor of a nuclear reactor containment vessel, and more particularly to a diaphragm floor of a nuclear reactor containment vessel that can simplify construction and reduce man-hours.

[0002]

[Prior art]

 Generally, as shown in FIG. 3, a reactor pressure vessel 2 is supported by a cylindrical pedestal 3 inside a reactor containment vessel in a nuclear power plant or the like, and a space between the pedestal 3 and the reactor containment vessel 1 is provided. A diaphragm floor 5 is provided in the storage container 1 to divide the inside of the storage container 1 into an upper dry well 6 and a lower suppression chamber 7. The pedestal 3 which is the base of the pressure vessel 2 has a vent pipe 8 previously stored therein. In the event that a coolant loss accident occurs due to pipe breakage or the like in the drywell 6, leakage will occur. The generated steam or the like is guided to the suppression chamber 7 through the vent pipe 8 and cooled / condensed by the cooling water w so that the rise of the pressure / temperature in the dry well 6 can be suppressed.

[0003]

[Problems to be solved by the device]

 By the way, the diaphragm floor 5 is required to be able to withstand a large differential pressure generated between the dry well 6 and the suppression chamber 7 in the event of loss of coolant or the like, and is conventionally made of reinforced concrete of high strength and high rigidity. It had been. However, in the diaphragm floor 5 made of reinforced concrete, a beam body (steel frame) is required to support the concrete when placing it, and the beam body must be removed after the concrete is hardened. This was an obstacle to simplifying the construction and shortening the construction period.

In particular, since the beam body as described above is constructed in a large size in order to reliably support the weight of the poured concrete, when removing the beam body, it is cut into small pieces and placed outside the storage container 1. It has to be carried out, which requires a great deal of trouble and time.

Therefore, an object of the present invention is to eliminate the work of removing the beam body by incorporating a temporary beam that has been conventionally used in the structure of the diaphragm floor, thereby simplifying the construction and shortening the construction period. It is to provide a diaphragm floor of a containment vessel that can be designed.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is provided between a reactor containment vessel and a pedestal installed upright in the vessel, and divides the containment vessel into an upper dry well and a lower suppression chamber. On the diaphragm floor of the reactor containment vessel, steel beam bodies are laid at predetermined angles between the inner peripheral wall of the reactor containment vessel and the outer peripheral wall of the pedestal, and the steel beam bodies are sealed. A plate is laid and a concrete layer is placed on the seal plate.

[0007]

[Action]

 According to the above configuration, the diaphragm floor has a laminated structure of a steel beam body, a seal plate, and a concrete layer, so that the conventional temporary beam can be used as it is as the steel beam body as compared with the conventional temporary beam. Removal work can be abolished.

[0008] Moreover, if a temporary beam as it is is used as a steel beam body, the strength of the diaphragm follower can be increased, and it becomes possible to withstand a sufficient differential pressure even if the reinforcing bar is removed from the concrete layer. .

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a schematic configuration of a diaphragm floor 10 of this embodiment. In the figure, 1 is a reactor containment vessel, and 3 is a cylindrical pedestal standing upright in the containment vessel 1. In the annular space between the reactor containment vessel 1 and the pedestal 3, a steel beam body 11 made of H-shaped steel is spanned with a predetermined angle pitch (18 ° pitch). Here, one end of the steel beam body 11 is fixed to the inner peripheral wall 1a of the reactor containment vessel 1, and the other end of the steel beam body 11 is horizontally formed on the outer peripheral wall 3a of the pedestal 3. It is mounted on the support 4. A predetermined gap s ₁ is formed between the other end of the beam 11 and the outer peripheral wall 3 a of the pedestal 3.

An annular plate 15 is attached to the outer peripheral wall 3a of the pedestal 3 along the circumferential direction thereof. The annular plate 15 is attached above the upper flange 11 a of the steel beam body 11 by a predetermined distance, and a predetermined gap s ₂ is provided between the upper surface of the steel beam body 11 and a concrete layer 13 described later. Is forming. As shown in FIG. 2, between the annular plate 15 and the upper surface 4a of the support portion 4, a pair of opposed holding plates 16 are vertically extended at a predetermined angular pitch. These holding plates 16 and 16 are for transmitting a horizontal force applied to the pedestal 3 to the steel beam body 11 at the time of an earthquake or the like, and hold the steel beam body 11 from both sides thereof.

As shown in FIG. 1, the inside of the storage container 1 is divided into the dry well 6 and the suppression chamber 7 on the steel beam bodies 11, 11 ... Suspended between the storage container 1 and the pedestal 3. An annular seal plate 12 is laid to divide the area. The outer peripheral edge of the seal plate 12 is in airtight contact with the inner peripheral wall 1a of the storage container 1, and the inner peripheral edge is bent upward to form a bent portion 12a. The bent portion 12a of the seal plate 12 is placed on the annular plate 15, and cooperates with the annular plate 15 to hermetically partition the dry well 6 and the suppression chamber 7 from each other.

A concrete layer 13 is further formed on the seal plate 12. Here, the concrete layer 13 is constructed by placing concrete from the seal plate 12 and the annular plate 15, and the net 14 is previously placed at the place of placement in order to prevent cracks and the like. Good. However, since the concrete layer 13 of this example is not required to have high strength, the net 14 may be very thin and rough unlike conventional rebars.

It should be noted that reference numerals 20 and 21 in FIG. 1 denote shear connectors for preventing the inner and outer peripheral edge portions of the concrete from floating when hardening the concrete.

In the diaphragm floor 10 having the above structure, however, the laminated structure of the steel beam body 11, the seal plate 12 and the concrete layer 13 is adopted, so that a high-strength and high-rigidity floor structure can be obtained. It can withstand the differential pressure between the dry well 6 and the suppression chamber 7 even when the coolant or the like is lost. Moreover, when the diaphragm floor 10 is installed, the steel beam bodies 11 are laid between the containment vessel 1 and the pedestal 3, the seal plates 12 are laid on the steel beam bodies 11, and then concrete is poured on the seal plate 12. Since it is not necessary to remove the beam for concrete pouring as in the conventional method, it is possible to simplify the construction and reduce the number of steps.

Further, by holding one end of the steel beam body 11 from both sides thereof by the pair of holding plates 16 and 16 provided on the pedestal 3 side, horizontal force such as seismic force applied to the pedestal 3 is applied to the steel. It can be transmitted to and absorbed in the reactor containment vessel 1 through the beam-forming body 11, and it is possible to reliably prevent the pedestal 3 from collapsing during an earthquake.

A gap s ₁ is formed between the end of the steel beam body 11 and the outer peripheral wall 3 a of the pedestal 3, and a gap s ₂ is formed between the steel beam body 11 and the concrete layer 13. Therefore, these gaps s ₁ and s ₂ can allow vertical and radial displacement differences due to the difference in thermal expansion between the containment vessel 1 and the pedestal 3. That is, since the deformation of the steel beam body 11 due to the displacement difference between the containment vessel 1 and the pedestal 3 can be absorbed by the gaps s ₁ and s ₂ , the reaction force of the steel beam body 11 toward the containment vessel 1 side. Can be kept low.

In the above embodiment, the H-shaped steel is used for the steel beam body 11, but it is needless to say that it may have another shape.

[0019]

[Effect of device]

 In summary, according to the present invention, the following excellent effects are exhibited.

(1) Since the diaphragm floor that divides the dry well and the suppression chamber has a laminated structure of a steel beam body, a seal plate and a concrete layer, a sufficient differential pressure is ensured even in the event of loss of coolant or the like. It is possible to obtain a high-strength, high-rigidity diaphragm follower that can withstand the above conditions.

(2) Further, when installing the diaphragm floor, since the conventional beam body for concrete placing can be used as it is, the work of removing the beam body can be eliminated, which simplifies the construction and reduces the man-hours. Can be planned.

[Brief description of drawings]

1 is a front sectional view showing an embodiment of a diaphragm floor of the present invention.

FIG. 2 is an enlarged sectional view taken along the line AA of FIG.

FIG. 3 is a diagram showing a schematic configuration inside a reactor containment vessel.

[Explanation of symbols]

1 Reactor containment vessel 3 Pedestal 6 Drywell 7 Suppression chamber 10 Diaphragm floor 11 Steel beam body 12 Seal plate 13 Concrete layer 15 Annular plate 16 Holding plate s ₁ , s ₂ Gap

Claims (1)

[Scope of utility model registration request] 1. A diaphragm floor of a reactor containment vessel, which is provided between a reactor containment vessel and a pedestal provided upright in the vessel and divides the interior of the containment vessel into an upper dry well and a lower suppression chamber. In, a steel beam body is laid at a predetermined angle between the inner peripheral wall of the reactor containment vessel and the outer peripheral wall of the pedestal, and a seal plate is laid on the steel beam body, and on the seal plate. A diaphragm floor for a reactor containment vessel, which is constructed by placing a concrete layer.