JPH01206292A - Nuclear reactor containment vessel - Google Patents

Abstract

PURPOSE:To improve the strength of a floor and shorten construction schedule by making a diaphragm floor a steel framed reinforced concrete structure in which a steel skeleton is buried and arranged and arranging lining plates on a lower surface. CONSTITUTION:Because deck receiving beams can be made of steel framed reinforced concrete by burying the conventional deck receiving beams in a diaphragm floor, the strength of the diaphragm floor is improved and the quantity of reinforcing steel can be reduced. Further, a lining material is stuck on the lower part of a steel skeleton. The lining material, namely, construction schedule can be shortened by sticking lining plates which are formed in a suppression chamber 40 by diaphragm floor part steel material 30, pedestal part material 31 and nuclear reactor containment vessel part steel material 32 and using the lining of a concrete placing molding box and a suppression chamber.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a nuclear reactor containment vessel.

(Prior art) The diaphragm floor 3 of the conventional x-reactor containment vessel 1 is
As shown in FIG. 6, it is supported by a reactor containment vessel 1 and a pedestal 2 for supporting the reactor pressure vessel.

The structure of the diaphragm 170a3 shown in FIG. 6 is a conventional example in which the reactor containment vessel is made of concrete.

The diaphragm floor 3 constitutes a boundary between the dry well 5 and the suppression chamber 4, and is structured to function as a pressure suppression device.

In the construction of this diaphragm floor 3, the diaphragm floor 3
It is necessary to install a formwork for concrete pouring at the bottom of the diaphragm floor 3, but since the floor height of the suppression chamber 4 is high, the shoring will be higher and the suppression chamber 4
An example of using the deck plate method, which does not require shoring, has been proposed in order to carry out internal lining work and shorten the construction period.

In the deck plate construction method, a deck plate 11 is provided at the bottom of the diaphragm floor 3 via the reactor containment vessel steel plate 7 and the pedestal fl plate 8, and the deck plate 11 is supported by a deck support beam 10. , supported by a deck beam support bracket 9. Then, after arranging the reinforcing bars 6, the diaphragm floor 3 was created by pouring concrete.

(Problems to be Solved by the Invention) The conventional reactor containment vessel of a nuclear power plant having the above configuration has the following problems.

The inner surface of the suppression chamber 4 is lined, and conventionally the iron plate was painted to prevent corrosion of the iron plate, but running costs are reduced when the material is stainless steel or when the iron plate and painting are applied. When compared, it was found that it is cheaper to use stainless steel.

When attempting to line the floor with stainless steel, it was found that the area around the bottom of the diaphragm floor had many irregularities, making it difficult to install the lining.

Attempting to install a lining at the bottom of the deck receiving beam will reduce the required volume of the suppression chamber 4, so the capacity of the reactor containment vessel will need to be larger than originally planned, but this is not a good idea since the amount of construction work will increase. isn't it.

Another option is to remove and transport the deck support beam IO and deck beam support bracket 9 and then line them with stainless steel material, but this is not a good idea because there is no opening for transport, and the work involved in transporting the deck increases the construction cost and construction period. do not have.

An object of the present invention is to provide a nuclear reactor containment vessel that facilitates the installation of a diaphragm floor and shortens the construction period.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a diaphragm floor that accommodates a reactor pressure vessel inside and divides the inside into an upper and lower dry well section and a suppression chamber section. A nuclear reactor containment vessel comprising: the diaphragm floor having a steel-framed reinforced concrete structure with a steel frame embedded therein and reinforcing bars arranged therein, and a lining plate disposed on the lower surface of the diaphragm floor; Provide a container.

(Function) In the reactor containment vessel configured in this way, the conventional deck support beam can be embedded in the diaphragm floor to make it made of steel-framed reinforced concrete, which improves the strength of the diaphragm floor and further improves the strength of the reinforcing bars. The amount can be reduced.

Furthermore, by attaching a lining plate to the lower part of the steel frame, the construction period can be shortened by serving both the concrete pouring formwork and the lining for the suppression chamber.

(Example) Hereinafter, a reactor containment vessel according to an example of the present invention will be described with reference to FIGS. 1 to 4. Here, FIG. 1 is a longitudinal sectional view of a concrete reactor containment vessel. A reactor pressure vessel 23 is housed within the reactor containment vessel 21,
The diaphragm floor 22 is supported by the concrete frame 26 of the reactor containment vessel 21 and the pedestal 24.

FIG. 2 is a detailed view of the diaphragm floor 22 and its surroundings. The steel frame 28, which is a large beam, is supported by the pedestal 24, and the other end is welded to and supported by a thick steel plate 25 provided on the side surface of the concrete frame 26.

In the planar direction of this steel frame 28, as shown in FIG.
A diaphragm floor portion stainless steel material 30 is disposed between the diaphragm floor portions 9 and 9 . The diaphragm floor stainless steel material 30, the pedestal stainless steel material 31, and the reactor containment vessel stainless steel material 32 form the lining of the suppression chamber 40.

FIG. 4 shows several trapezoidal shapes of the steel frame 28 and the thick steel plate 25.

The side surface of the steel frame 28 and the thick steel plate 25 are fixed by welding.

After pouring concrete to the level of the steel frame 28, the concrete frame 26 supports the steel frame 28 at the upper end of the concrete.

Further, a steel frame 33 disposed on the diaphragm floor 22 and a steel frame 41 disposed on the concrete frame 26 are connected by a coupler 34.

In addition, if you want to concrete the diaphragm floor regardless of the above-mentioned concrete pouring time, please use the fifth
As shown in the figure, a concrete frame 26 and a steel frame (beam) 28
A steel frame support member 35 may be installed and fixed with bolts 36 to receive it.

In the above configuration, according to the reactor containment vessel according to the present invention, by embedding the conventional deck beam in the diaphragm floor, there is no need to increase the number of steel members, and the structure of the diaphragm floor can be made of steel reinforced concrete. Therefore, the strength of the diaphragm floor can be improved, and furthermore, the amount of reinforcing bars can be reduced.

Furthermore, by welding and fixing stainless steel to the lower parts of the steel frames (large beams) and steel frames (small beams), the construction period can be shortened by serving both as the concrete pouring formwork and as the lining for the suppression chamber.

〔Effect of the invention〕

As described above, according to the present invention, the diaphragm floor constituting the reactor containment vessel has a steel-framed reinforced concrete structure, so the strength of the diaphragm floor can be improved, and furthermore, since the lining plate is provided at the bottom,
The construction period can be shortened by using both the concrete pouring form and the lining for the suppression chamber.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a reactor containment vessel according to an embodiment of the present invention, FIGS. Figure 4 is the second
FIG. 5 is an enlarged longitudinal sectional view of main parts showing another embodiment of the present invention, and FIG. 6 is a conventional reactor containment vessel. FIG. 3 is an enlarged vertical cross-sectional view of a main part showing an example. 21...Reactor containment vessel 22...Diaphragm floor 23...Reactor pressure vessel 28.29.
...Steel frame 30...Diaphragm floor part stainless steel agent Patent attorney Nori Chika Ken Yudo Daishimaru Ken Figure 1 Figure 2 A Figure 3 Figure 4 Δ1

Claims (1)

[Claims] In a reactor containment vessel that houses a reactor pressure vessel inside and has a diaphragm floor that divides the inside into an upper and lower dry well section and a suppression chamber section,
A reactor containment vessel characterized in that the diaphragm floor has a steel reinforced concrete structure with a steel frame embedded therein and reinforcing bars arranged therein, and a lining plate is arranged on the lower surface.