JP3486995B2 - Quencher support structure for concrete containment vessel - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quencher support structure for a concrete containment vessel.

[0002]

2. Description of the Related Art A concrete containment vessel (RCCV: Rein-forced Concrete Conta) as shown in FIG.
inmentVessel) is known. In this containment vessel 1, on the outer peripheral side of the cylindrical pedestal 3 supporting the pressure vessel (RPV) 2 and below the diaphragm floor 4,
An annular suppression chamber 5 is formed.

At the inner bottom of the suppression chamber 5,
A plurality of cross quenchers 7, 7 ... Are provided upright.

The cross quencher 7 is for discharging a part of the main steam discharged from the pressure vessel 2 to the pool P and condensing it when the pressure in the pressure vessel 2 rises.
That is, when the relief safety valve is connected to a main steam pipe (not shown) via a relief safety valve and the relief pressure of the pressure vessel 2 rises, the high-temperature, high-pressure steam in the main steam pipe is fed through the relief safety valve. 7b, and is ejected from a large number of nozzles formed in the cross-shaped head portion 7a.

By the way, the head portion 7 of the cross quencher 7
When high-temperature, high-pressure steam is injected into pool P from a, 7a ..., a very large bending load F (10 to 20 ton / m) is applied to the foundation of quencher 7 due to the injection balance. Takes. Therefore, the base of the quencher 7 must be erected on the bottom 1a of the storage container 1 so as to sufficiently withstand such a bending load F.

FIG. 3 shows a conventional concrete containment vessel 1.
It is the figure which expanded and showed the basic part of the quencher 7 in. In the figure, 11 is a cylindrical quencher foundation that supports the cross quencher 7, and is erected on a bottom liner 16 that forms the inner bottom of the suppression chamber 5. A gusset plate 12 having a substantially cross-shaped cross section is attached below the bottom liner 16 of the quencher foundation 11, and foundation bolts 14, 14 ... Are attached to the lower end of the gusset plate 12 via a bearing plate 13. There is.

The gusset plate 12, the bearing plate 13, and the foundation bolt 14 are embedded in the concrete 17 below the bottom liner 16, and the bending load F from the quencher foundation 11 is transmitted to the concrete 17 so that the quencher foundation 11 falls down. It is designed to prevent tilting.

In the figure, reference numeral 15 is a shear plate for transmitting a pulling load to the concrete 17, which is attached to the lower end portions of the foundation bolts 14, 14 ...

[0009]

In the above-mentioned conventional quencher support structure, the bottom liner 16 is sandwiched between the upper and lower cross-sectional shapes, that is, the quencher foundation 11 and the gusset plate 12 have different cross-sectional shapes. However, there is a problem that a large amount of liner material is required. That is, in the concrete containment vessel 1 described above, a flat boundary (barrier) for preventing leakage of a coolant or the like must be formed on the inner bottom portion of the suppression chamber 5. In the conventional structure shown in FIG. 3, the quencher foundation 11 is erected directly on the bottom liner 16 in order to maintain such a boundary. Therefore, it is desired that the bending load F from the quencher foundation 11 is satisfactorily transmitted downward to the bottom liner 16, and the portion 16 sandwiched by the quencher foundation 11 and the gusset plate 12 is desired.
It was necessary to increase the thickness of a.

It is an object of the present invention to provide a quencher support structure for a concrete containment vessel which can reduce the thickness of the bottom liner and thereby reduce the manufacturing cost.

[0011]

In order to achieve the above object, the present invention provides a bottom liner that forms the inner bottom of a suppression chamber and is laid on concrete.
In a quencher support structure of a concrete containment container which erected a cylindrical quencher foundation, a lower end portion of the quencher foundation is supported by concrete by penetrating the bottom liner, and on the inner peripheral side of the quencher foundation and A closing plate that closes the inside of the quencher foundation is provided at the same height as the bottom liner.

[0012]

According to the above structure, since the lower end of the quencher foundation is supported by the concrete by penetrating the bottom liner, the bending load acting on the quencher foundation is directly transmitted to the concrete without being shared by the bottom liner. You can Also, by providing the closing plate on the inner circumference side of the quencher foundation and at the same height position as the bottom liner, even if the lower end of the quencher foundation is penetrated to the lower side of the bottom liner, the inner bottom of the suppression chamber is Can form a flat boundary.

When the lower end of the quencher foundation is directly supported by the concrete below the bottom liner, the bottom liner can be prevented from being subjected to a load, but the boundary of the coolant or the like is located inside the quencher foundation, that is, outside the suppression chamber. It will be set. According to the above configuration, since the inside of the quencher foundation is closed at the same height position as the bottom liner, a boundary similar to the conventional one can be configured in the quencher foundation, and a leak boundary can be prevented.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a diagram showing an embodiment of the quencher support structure of this embodiment. In the figure, reference numeral 26 is a bottom liner that partitions the inner bottom of the suppression chamber 5, and is laid on the concrete 17 forming the storage container 1. The concrete 17 is a reinforced concrete mat layer 18 made of reinforced concrete and a slab layer 1 made of unreinforced concrete.
9 and 9. The bottom liner 26 is laid on the relatively soft slab layer 19 and has a structure in which the back side of the bottom liner 26 is closely backed up by concrete 17.

Further, 21 is a cross quencher 7 at the upper end.
(Fig. 2) is a cylindrical quencher foundation on which is installed.
The lower end of the quencher foundation 21 penetrates the bottom liner 26 and is embedded in the slab layer 19 in the bearing plate 1.
It is erected on top of 3. A shear plate 15 for transmitting a pulling load to the mat layer 18 is provided below the bearing plate 13 with a space therebetween, and a bending load F is applied to the mat layer 18 between the bearing plate 13 and the shear plate 15. Base bolts 14 for transmitting are mounted along the vertical direction.

Thus, when the steam is discharged from the cross quencher 7, the bending load F acting on the cylindrical quencher foundation 21 is directly transmitted to the bearing plate 13 without being shared by the bottom liner 26, and further the foundation bolts. 1
It will be transmitted to the high-strength mat layer 18 via 4, 14, ....

An annular flange plate 28 is attached to the outer periphery of the quencher base 21. The flange plate 28 is joined to the liner plate 25 to form the bottom liner 26, and is provided at the same height position as the liner plate 25. On the other hand, a disk-shaped closing plate 27 is provided on the inner peripheral side of the quencher foundation 21. The closing plate 27 prevents the inner bottom portion of the quencher base 21 from becoming a boundary such as a coolant, and is attached to the inner peripheral side of the flange plate 28, that is, at the same height position as the liner plate 25.

At the inner bottom portion of the storage container 1 of this embodiment, a flat boundary of a coolant or the like is formed by the above-mentioned three plates 25, 27 and 28 as in the conventional case.

In FIG. 1 (a), 20 is the closing plate 2.
It is a space inside the foundation 21 formed below 7, and is filled with concrete.

In the quencher support structure of this embodiment described above, the bearing plate 13 is formed by penetrating the bottom liner 26 at the lower end of the cylindrical quencher base 21.
Since it is erected on the top and the inside of the quencher foundation 21 is closed by the closing plate 27, the bending load F acting on the quencher foundation 21 can be transmitted to the high-strength mat layer 18 without acting on the bottom liner 26. it can. For this reason, it is not necessary to increase the thickness of the bottom liner 26, and it is possible to reduce the amount of material and eventually cost. That is, in the conventional structure shown in FIG. 3, since the quencher foundation 11 is erected on the bottom liner 16 and the load F from the quencher foundation 11 is transmitted through the bottom liner 16, in order to maintain good load transferability. The bottom liner 26 needed to be thickened. In the present embodiment, since the bending load F from the quencher foundation 21 is received by the bearing plate 13 below the closing plate 27, the bending load F is not shared by the closing plate 27, and the closing plate 27 inside the suppression chamber 5 does not share the bending load F. It may be thin enough to withstand the pressure specified in.

Further, in this embodiment, the lower end of the quencher foundation 21 is erected on the bearing plate 13, so that the conventional gusset plate 12 (FIG. 3) is unnecessary, and the quantity of material can be reduced. . In the conventional structure shown in FIG. 3, in order to prevent the bottom liner 16 from being deformed,
Since the gusset plate 12 was attached to the lower surface of the bottom liner 16 so that the load F from the quencher foundation 11 was temporarily received by the plate 12, there were many welding points and the manufacturing cost was high. In this embodiment, since the gusset plate 12 is eliminated, the number of welding points is reduced accordingly,
The cost can be reduced.

Next, a method of manufacturing the quencher support structure will be described.

When the high-strength mat layer 18 is made of reinforced concrete, liner plates 25 are installed above the mat layer 18 at intervals. Next, the lower end of the cylindrical quencher base 21 is passed through the through hole 25 a of the liner plate 25 to stand upright on the bearing plate 13, and is welded and joined to the center of the upper surface of the plate 13.

At this time, the inner circumference 21b of the quencher foundation 21
A disk-shaped closing plate 27 is already attached to the upper and lower sides by fillet welding 33 from both upper and lower sides. Further, an annular flange plate 28 is attached to the outer periphery 21a of the quencher base 21 by fillet welding 32 from both upper and lower sides, and in the state where the quencher base 21 is erected on the bearing plate 13, The flange plate 28 is fitted into the through hole 25a of the liner plate 25.

Flange plate 28 and liner plate 2
5 is joined by butt welding 31 to form the bottom liner 26, and then concrete is poured into the gap between the bottom liner 26 and the mat layer 18 to form the slab layer 19. This allows the bottom liner 26 to move to the concrete 17
The quencher support structure having the above-mentioned structure is obtained by closely laying on the top.

As described above, the bottom liner 26 is divided into the liner plate 25 of the mat layer 18 and the flange plate 28 on the outer periphery of the quencher base 11, and when the liner plate 25 is installed, the two plates 28, 25 are joined together. Thus, a high-strength bottom liner 26 can be obtained. That is, the quencher foundation 2 is formed before the formation of the slab layer 19.
By attaching the flange plate 28 to the outer peripheral surface 21a of No. 1, the flange plate 28 can be attached by fillet welding 32 from both upper and lower sides, and a high-strength joint structure can be obtained.

Although the concrete containment vessel (RCCV) 1 integrated with the building has been described in the above embodiment, another concrete containment vessel, for example, MARK.
-Also applicable to II. The point is that it is made of concrete and has a pool at the bottom.

[0029]

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

(1) Since the load acting on the quencher foundation can be directly transmitted to the concrete without acting on the bottom liner, it is not necessary to locally increase the thickness of the bottom liner, and the thickness of the bottom liner can be reduced. Can be planned.

(2) Since the conventional gusset plate is not required, the number of parts and the number of welding points can be reduced.

(3) It is possible to reduce the amount of material from (1) and (2),
Manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a quencher support structure for a concrete storage container according to the present invention, (a)
Is a front view, and (b) is a sectional view taken along the line AA of (a).

FIG. 2 is a schematic view showing an overall configuration of a conventional concrete storage container.

3A and 3B are views showing a conventional quencher support structure, in which FIG. 3A is a front view and FIG. 3B is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

1 Concrete containment 2 Pressure vessel 5 Suppression chamber 7 Quencher 17 concrete 21 Quencher basics 25 liner plate 26 Bottom liner 27 Closure plate 28 Flange plate

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-11-190789 (JP, A) JP-A-64-32194 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G21C 9/004 G21C 13/00

Claims (2)

(57) [Claims] 1. A quencher support structure for a concrete containment vessel in which a cylindrical quencher foundation is erected on a bottom liner that forms an inner bottom portion of a suppression chamber and is laid on concrete, and a lower end of the quencher foundation is provided. The part is pierced through the bottom liner and supported by concrete, and a closing plate for closing the inside of the quencher foundation is provided on the inner peripheral side of the quencher foundation and at the same height position as the bottom liner. Quencher support structure for concrete containment. 2. A quencher support structure for a concrete containment vessel, wherein the bottom liner is constructed by joining a liner plate installed on concrete and a flange plate attached to the outer periphery of a quencher foundation to each other.