JP3110059B2 - Containment vessel construction method for nuclear power plants - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[Object of the Invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a containment vessel of a nuclear power plant, and more particularly to a method of constructing a containment vessel of a nuclear power plant which can shorten the construction period.

[0003]

2. Description of the Related Art As a containment vessel of a nuclear power plant, a container having a structure in which a lining is formed on an inner surface of a concrete wall is often used.

[0004] A conventional construction method for a containment vessel of a nuclear power plant will be described with reference to FIGS. 5 and 6. First, as shown in FIG. 5, the mat 3 is constructed by arranging reinforcing bars of the mat 3 at the bottom of the containment vessel 2 and placing concrete on the excavated bedrock 1.

[0005] Next, the bottom lining 4a and the lower lining 4b constituting the bottom and the inner periphery of the storage container 2 are assembled. When the lower lining 4b reaches the installation height of the diaphragm floor 5, the reinforcement arrangement, the mold arrangement, and the concrete placement are performed on the outer peripheral lower part 6a of the containment vessel.

[0006] On the other hand, in parallel with these operations, the pedestal 8 for installing the reactor pressure vessel 7 is assembled. This pedestal 8 usually has a reinforcing steel structure, and after being laid in a large block, Since it is assembled on the mat 3,
Completed in a short construction period.

The pedestal 8 and the bottom lining 4
a, the lower lining 4b and the diaphragm floor 5 form the pressure suppression pool 9, so that the framework of the diaphragm floor 5 is mounted when the pedestal 8 and the concrete of the outer peripheral lower part 6a of the containment vessel have reached the installation height of the diaphragm floor 5. Then, reinforcement and concrete placement are performed.

[0008] Thereafter, the upper lining 4c is assembled, and concrete work for the outer peripheral upper portion 6b of the containment vessel is subsequently performed. Subsequently, construction of the drywell 10 and the ceiling lining 4d is performed.

On the other hand, in the reactor building 11, concrete works are carried out in accordance with the progress of the concrete work for the lower part 6a of the outer periphery of the containment vessel and the upper part 6b of the outer periphery of the containment vessel, thereby constructing each floor 12.

In the conventional containment vessel construction method described above, the concrete work on the lower part 6a of the outer periphery of the containment vessel has been a critical path.

[0011]

As described above, in the conventional containment vessel construction method, after the lower lining 4b is assembled to the position of the diaphragm floor 5, the containment vessel outer peripheral lower part 6a is not completed after concrete work. When,
Because the diaphragm floor 5 cannot be mounted,
The construction period is long. On the other hand, the pedestal 8 has a steel structure and is carried in as a large block before being assembled, so that the construction period is short. As a result, a large waiting time is generated between the outer peripheral lower part 6a of the storage container and a wasteful construction period and man-hours are required.

In addition, since the construction cannot be started in the upper lining 4c and the inside of the dry well 10 only after the diaphragm floor 5 is mounted, a delay in mounting the diaphragm floor 5 is also a factor that hinders shortening of the construction period. Furthermore, the pressure suppression pool 9 formed below the diaphragm floor 5 has a disadvantage that if the diaphragm floor 5 is not mounted, there is no ceiling, so that it is directly affected by the weather.

As described above, the conventional nuclear power plant containment vessel construction method has problems that the safety is not sufficient and the work efficiency is reduced.

The present invention has been made in view of the above, and an object of the present invention is to make a containment skeleton using a steel frame, to support and mount a diaphragm floor irrespective of the progress of the containment concrete work, and to shorten the construction period. Another object of the present invention is to provide a method for constructing a containment vessel of a nuclear power plant with improved work safety and efficiency.

[Structure of the Invention]

[0016]

In the method for constructing a containment vessel of a nuclear power plant according to the present invention, a bone assembling work for erecting a frame portion of the containment vessel on a mat precedes the assembling of a lining of the containment vessel. Pressure vessel pedestal and the lining before the concrete section provided outside the lining of the containment vessel is completed to the height of the diaphragm floor.
The diaphragm floor is installed by using a receiving stand arranged inside the lower lining of the diaphragm.

[0017]

In the method of the present invention, when the height of the lining of the containment vessel reaches the mounting position of the diaphragm floor and the assembly of the pedestal for installing the reactor pressure vessel is completed, the pedestal and the containment vessel are assembled. Since the diaphragm floor is mounted by the steel frame for construction, regardless of the progress of concrete work on the containment vessel to be constructed around the lining, construction of the diaphragm floor, lining assembly above the diaphragm floor, and construction of the drywell can be performed. Also, construction in the pressure suppression pool formed below the diaphragm floor can be performed safely without being affected by the weather because the diaphragm floor functions as a ceiling.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In these figures, the same parts as those in FIG. 5 are denoted by the same reference numerals.

In the present invention, as shown in FIG. 1, the mat 3 is constructed by arranging the mat 3 at the bottom of the containment vessel 2 and placing concrete on the excavated bedrock 1. Next, as shown in FIG. 4, while the construction of the mat 3 is still under construction, the steel frame assembling work of the containment vessel 2 and the reactor building 11
Work on the exterior wall and floor of the building. The former is a construction for erecting only the steel frame portion of the containment vessel 2, and the latter is an outer wall 13 of the reactor building 11 and the outer wall 1 as shown in FIG.
This is a construction work to provide a floor 12 connected to 3.

In the steel frame assembling work of the containment container 2, first, the steel column 14a is erected on the mat 3 on the outer peripheral side of the containment container 2 at predetermined intervals in the circumferential direction. Next, a plurality of annular beams 14b are vertically arranged in a row on each of the steel columns 14a. The steel columns 14a are pre-blocked to the required dimensions.
Are successively stacked from the bottom toward the top. The block 15 of the steel column 14a is, for example, as shown in FIG.
As shown in (a), the flanges 16 are fastened to each other with bolts and nuts 17 or are connected by welding 18 as shown in FIG. Further, as shown in FIG. 3, a lower lining 4b of the lining of the containment vessel 2 is disposed on the inner peripheral side of the containment vessel 2 of the steel column 14a, and the blocks 15 are connected to each other by welding the lower linings 4b of the blocks 15. You. The block 15 at the height of the diaphragm floor 5 is provided with a support 19 for the diaphragm floor 5 disposed inside the lower lining 4b, as shown in FIG.

On the other hand, in parallel with these framing operations, after finishing the work of the mat 3, the pedestal 8 for installing the bottom lining 4a and the reactor pressure vessel 7 is assembled. The pedestal 8 has a steel structure, and is assembled on a mat 3 after being laid in a large block. The pedestal 8 forms a pressure suppression pool 9 together with the bottom lining 4a, the lower lining 4b, and the diaphragm floor 5.

Next, when the pedestal 8 is completed up to the height of the diaphragm floor 5, the framework of the diaphragm floor 5 is mounted and fixed between the pedestal 8 and the receiving stand 19 disposed inside the lower lining 4b. The construction of the diaphragm floor 5 is carried out by the use of reinforcing bars and concrete.

Before and after the mounting of the framework of the diaphragm floor 5, a formwork (not shown) is mounted on the outer periphery of the lower lining 4b, and the outer peripheral lower part 6a of the containment vessel is constructed by casting concrete. After the construction of the diaphragm floor 5,
The upper lining 4c is assembled, and further, the inside of the dry well 10 and the ceiling lining 4d are constructed.

On the other hand, the reactor building 11 constructs an outer wall 13 and a floor 12 of each floor connected to the outer wall 13 in accordance with the progress of the concrete work of the lower part 6a of the containment vessel and the upper part 6b of the containment vessel.

Therefore, the diaphragm floor 5 is supported by the pedestal 8 which is blocked and started up in a short construction period and the pedestal 8 which is also completed in a short construction period, and can be mounted and constructed at an early stage of the process. The construction period of the concrete containment vessel 2 including the furnace building 11 can be shortened, the construction in the pressure suppression pool 9 and the dry well 10 can be started early, and the work can be safely performed by installing the ceiling.

FIG. 1 shows a state in which the block 15 of the steel column 14a is also used to support a penetration 20 installed through the containment vessel 2.
During the construction of the outer peripheral lower portion 6a and the upper outer peripheral portion 6b of the containment vessel, it can be used as a support base for the penetration 20.

[0027]

As described above, in the present invention,
The pedestal for installing the reactor pressure vessel and the steel frame of the concrete containment vessel are used to install and construct the diaphragm floor before the containment vessel is completed, so the construction period of the containment vessel can be significantly reduced, and furthermore Since the diaphragm floor is mounted earlier, the work in the pressure suppression pool and the drywell can be performed without being affected by the weather, and efficiency and safety can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view illustrating a construction method according to the present invention.

FIGS. 2A and 2B are front views each illustrating a method of connecting the blocks 15 of the steel column 14a in FIG. 1 to each other.

FIG. 3 is an enlarged sectional view showing a main part in a dashed-dotted line frame III of FIG. 1;

FIG. 4 is a process chart showing the method of the present invention.

FIG. 5 is a longitudinal sectional view for explaining a conventional construction method for a nuclear power plant containment vessel.

FIG. 6 is a process chart showing a conventional construction method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rock 2 ... Containment container 3 ... Mat 4a ... Bottom lining 4b ... Bottom lining 4c ... Top lining 4d ... Ceiling lining 5 ... Diaphragm floor 6a ... Containment container outer peripheral lower part 6b ... Upper part of outer periphery of containment vessel 7... Reactor pressure vessel 8... Pedestal 9... Suppression pool 10... …… Steel column 14b …… Annular beam 15 ……… Block 16 ……… Flange 17 ……… Bolts and nuts 18 ……… Welding 19 ……… Cradle 20 …… Penetration

Claims (1)

(57) [Claims] When constructing a primary containment made of concrete for a nuclear power plant (hereinafter, referred to as a containment), a bone assembling work for erecting a skeleton portion of the containment on a mat is performed by lining a lining of the containment. The lower lining of the pressure vessel pedestal and the lining before the concrete section provided outside the lining of the containment vessel is completed up to the height of the diaphragm floor, and which is carried out prior to the assembly of
A method for constructing a containment vessel of a nuclear power plant, wherein the diaphragm floor is installed by using a receiving stand arranged inside the nuclear power plant.