JPS6157890A - Method of construction of housing for nuclear reactor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for constructing a nuclear reactor building in a nuclear power plant.

[Technical background of the invention]

The reactor building already proposed is shown in Figure 22 and Figure 2.
As shown in Figure 3, Mat 1 is constructed by pouring and curing concrete on a foundation that has been dug down to bedrock.
Pedestal 2 holds the pressure vessel (reactor) on top, and each slab (floor and ceiling) installs the primary system equipment of the reactor.
3 and various storage chambers and storage chambers are formed by a cylindrical wall 4, and a containment vessel 5 is provided on the outside of the cylindrical wall 4 to house the pedestal 2 holding the pressure vessel, This containment vessel 5 is constructed by leaving a gap on the outside and covering it with an animus wall body 6.

The reactor building constructed in this manner is constructed using the following construction method.

In other words, the reactor building construction method that has already been proposed is
In the process, reinforcing bars are laid concentrically on a foundation that has been dug down to bedrock, and concrete is poured and cured to construct Mat 1.

Next, in the second step, as shown in FIG.
, the base of the cylindrical wall 4 and the base of the annulus wall 6.

In the third step, the pedestal 2 is constructed to the top and a pressure vessel is attached thereto, and the assembly construction is completed while keeping the containment vessel 5 airtight.Subsequently, the containment vessel 5 pressure leakage test (: pov T-
71r) and the containment vessel 5 are inspected for opening.

1. Furthermore, in the fourth step, the cylindrical wall body 4
, and the construction of the annulus wall body 6 is started.

Next, in the fifth step, between the annulus wall 6, the outer side of the pedestal 2, and the inner side of the cylindrical wall 4,
The first slab 3a constituting the floor and ceiling is laid horizontally to provide a storage room or storage room on the first floor.

In the sixth step, the annulus wall 6 and the cylindrical wall 4 are constructed synchronously.

Furthermore, in the seventh step, as in the fifth step, a second slab 3b is placed horizontally between the annulus wall 6, the outer side of the pedestal 2, and the inner side of the cylindrical wall 4. Lay it down and create a storage room or storage room on the second floor.

In this way, the annulus wall 6, the third slab 30 . The fourth slab 3d is being constructed and the reactor building is undergoing machining.

In particular, in the above-mentioned reactor building construction method, in the third step,
A leakage test is conducted on the containment vessel 5 to confirm its airtightness, and then an open inspection is conducted to check that there are no abnormalities inside the containment vessel 5. .

[Problems with background technology]

However, in the open inspection of the containment vessel in the above-mentioned reactor building construction method, because the gap between the inner side of the containment vessel 5 and the cylindrical wall 4 is approximately Joommm, it is difficult for people to open the containment vessel. Since it is difficult to enter and inspect, it is necessary to secure the space necessary for open inspection.
As a result, construction of the cylindrical wall body 4 is forced to be temporarily interrupted, and the construction period is delayed due to this.

In this way, in the above-mentioned nuclear reactor building construction method, the open inspection of the containment vessel becomes a critical path in the first step of construction, and this becomes a problem in shortening the construction period of the nuclear power generation plan.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and even when the containment vessel is opened and inspected, the construction of the cylindrical wall and each slab can be continued without interrupting the construction of the cylindrical wall or each slab. To provide a reactor building construction method that performs parallel work with the containment vessel assembly work, removes the above-mentioned containment vessel open inspection from the critical path, and significantly shortens the construction period of the reactor building. It is.

[Summary of the invention]

In the present invention, a mat is laid on a foundation dug down to the bedrock, and the pedestal base, the containment vessel base, and the annulus wall base are synchronized with this mat (constructed in a circular manner, and the pedestal and upper H. [While building the containment vessel upward, attach each bracket in order from bottom to top at a certain interval on the outer periphery of the pedestal and the inner periphery of the above-mentioned containment vessel, and between the brackets facing each other, Each deck plate is erected in turn, thereby completing the containment vessel and pedestal. When the containment vessel is assembled, the containment vessel is subjected to a leakage test and an open inspection, and a cylindrical shape is formed on the inner circumference of the containment vessel. Along with building the wall,
The construction period is shortened by sequentially installing each slab on each deck plate.

[Embodiments of the invention]

Hereinafter, the present invention will be described with reference to an illustrated embodiment.

It should be noted that the present invention will be described with the same reference numerals attached to the same constituent members as in the above-described specific example.

1 to 18 disclose each step of the reactor building construction method according to the present invention. As shown in FIG. The mat 1 is constructed by laying concentric circles, pouring concrete onto the mat, and curing it.

Next, in the second step, the construction of the base of the pedestal 2, the base of the containment vessel 5, and the base of the annulus wall 6, which are formed to have a cross-sectional cross section, is started in a synchronized and concentric manner. Also, −F
While constructing the pedestal 2 and the containment vessel 5 upward, first brackets 7.8 are attached to the outer periphery of the pedestal 2 and the inner periphery of the containment vessel 5 at a constant interval from bottom to top. (See Figures 2, 19, and 20).

Further, a deck plate 9 is installed between each of the brackets 7.8 facing each other.

This deck plate 9 is shown in FIGS. 19 and 20.
As shown in the enlarged view, a pair of elongated holes 9a are drilled at one end of the plate, and each mounting bolt 10, which is passed through the elongated measuring hole 9a, horizontally attaches the deck plate 9 to the bracket 7. Moreover, it can be adjusted and fixed.

In this way, as shown in FIGS. 4 to 8,
Containment vessel 5, pedestal 2 and each of the above brackets 7.
8, each deck plate 9 is constructed in order from bottom to top, and the annulus wall 6 on the outside of the containment vessel 5 is constructed continuously.

As shown in FIG. 9, immediately after the assembly of the containment vessel 5 is completed, the containment vessel 5 is subjected to a leakage test and an opening inspection.

Particularly, in the present invention, brackets 7.8 are attached to the outer periphery of the pedestal 2 and the inner periphery of the containment vessel 5 at regular intervals from bottom to top, and the brackets 7.8 are attached to each other in order from bottom to top. Since each deck plate 9 is erected in sequence while facing each other, and the pedestal 2 and the containment vessel 5 are built up in a sequential manner, leakage tests and opening inspections of the containment vessel 5 can be performed. .

Next, in a third step, as shown in FIG. 10, the base of the cylindrical wall 4 is constructed on the inner periphery of the containment vessel 5. Further, on the deck plate 9, a first slab 3 is placed.
It is constructed as shown in FIGS. 1 and 19.

Note that, as shown in FIG. 19, this slab 3 includes a plurality of reinforcing bars 11. A plurality of embedded fittings 12 and each sleeve 1
3 constitutes the framework, and concrete is poured and cured on this.

In this way, as shown in FIGS. 12 to 18, the -F-shaped wall 4 and each slab 3 are provided in sequence without interruption, and the outer surface of the containment vessel 5 is annulus walls 6 are constructed continuously.

It should be noted that each of the above-mentioned brackets 7, 8 may be removed by fusing after constructing each slab 3, or it is of course possible to leave them attached as they are.

Next, the construction schedule shown in FIG. 21 shows a comparison between the reactor building construction method that has already been proposed and the present invention, and as will be clear from this, the present invention Since the containment vessel 5 leakage test (POVL/F) and its opening inspection can be carried out continuously without interrupting construction, the total reactor building construction period that has already been proposed can be shortened to approximately 1/2. can.

〔Effect of the invention〕

As described above, according to the present invention, the mat 1 is laid on the foundation dug down to bedrock, and the base of the pedestal 2, the base of the containment vessel 50, and the annulus wall 6 are synchronously and concentrically constructed on the mat 1. Furthermore, while building the pedestal 2 and the containment vessel 5 upward, each bracket 7.8 is sequentially installed from bottom to top at a constant interval on the outer periphery of the pedestal 2 and the inner periphery of the containment vessel 5. The deck plates 9 are successively installed between the brackets 7.8 facing each other, thereby completing the construction of the containment vessel 5 and the pedestal 2. When the containment vessel 5 is assembled, the above-mentioned The containment vessel 5 is subjected to a leakage test and an open inspection, and the cylindrical wall body 4 is constructed around the inner periphery of the containment vessel 5, and each slab 3 is sequentially provided on each of the deck plates 9. This method has excellent effects such as not only being able to significantly shorten the construction period of a reactor building, but also improving work safety during construction.

[Brief explanation of drawings]

1 to 18 are diagrams for explaining the reactor building construction method of the present invention, FIG. 19 is an enlarged view of chain circle B in FIG. 2, and FIG. A plan view along the chain line Q-0 in the figure, FIG. 21 is a graph showing the reactor building construction process, and FIG. 22 is a diagram of the reactor building for explaining the reactor building construction method that has already been proposed. The sectional view, FIG. 23, is an enlarged cross-sectional view taken along the dashed line Moom in FIG. 22. DESCRIPTION OF SYMBOLS 1...Matt, 2...Pedestal, 3...Slab, 4...Cylindrical wall, 5...Containment vessel, 6...Annou lath wall, 7.8... Bracket, 9...Deck plate, 10...Mounting bolt. Applicant's agent Kiyoshi Inomata 1 Figure 5 Figure 7 Division.

Claims (1)

[Claims] 1. A mat is laid on the foundation dug down to the bedrock, and the base of the pedestal, the base of the containment vessel, and the base of the annulus wall are synchronously and concentrically constructed on this mat, and further, the base of the pedestal is and while building the containment vessel upwards,
Brackets are installed in order from bottom to top at a certain interval around the outer circumference of the pedestal and the inner circumference of the containment vessel, and each deck plate is erected in order between the brackets facing each other. When the construction of the containment vessel and pedestal is completed, and the assembly of the containment vessel is completed,
A nuclear reactor characterized in that the containment vessel is subjected to a leak test and an open inspection, a cylindrical wall is constructed around the inner periphery of the containment vessel, and each slab is sequentially provided on each of the deck plates. Building construction method. 2. The reactor building construction method according to claim 1, wherein the annulus wall on the outside of the containment vessel is constructed in synchronization with the construction of the containment vessel.