JPS59142497A - Method of fixing intermidiate slab samp tank for reactor container - 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 The present invention relates to a construction method for installing a sump tank provided in a pedestal intermediate slab of a nuclear reactor containment vessel.

Figure 1 shows an example of the structure of a general reactor containment vessel.
A dry well 4 and a suppression chamber 5 are airtightly partitioned vertically by a diaphragm floor 6 and an intermediate slab 7 of the pedestal 3.

In the intermediate slab 7, there is a sump tank 8 for temporarily storing high-conductivity waste liquid, low-conductivity waste liquid, etc. generated in the reactor containment vessel 1. There are several buried along the inner circumference.

Conventionally, when installing the sump tank 8, the pedestal 3 in the lower part of the intermediate slab 7 is first constructed, and the sump tank 8 is individually supported on the pedestal 3 by a framework or the like. This is done by centering and fixing, and then pouring concrete and burying the sump tank 8 in the intermediate slab 7. If the scaffolding or the like is incomplete before the middle m1 slab 7 is completed, there is a problem in that a lot of labor is required to center each sump tank 8 individually.

The present invention has been proposed in consideration of the above-mentioned circumstances, and is based on the fact that a plurality of sump tanks are assembled in advance at a place with good cropping conditions such as a factory, and then assembled into an intermediate slab. The purpose of the attachment is to improve accuracy and shorten the construction period.
The steps will be explained in order with reference to FIG. In addition, the same reference numerals are given to the parts common to the conventional example in (2) to simplify the explanation.

(1) Sump tank manufacturing process First, a sump tank 8 shaped like a part of a ring is manufactured from a stainless steel plate or the like. These sump tanks 8 are placed at intervals and centered.
The inner pocket 1 is reinforced with a cross-shaped support frame 10, and an outflow pipe 11 for outflowing liquid from the sump tank 8 is reinforced. Attach each 2(.

(il) Reinforcing frame manufacturing process In parallel with the step (1) above, a reinforcing frame 12 that suspends the connected sump tank 8 and a liner plate 13 that covers the inner circumference of the pedestal 3 above the sump tank 8 are installed. Assemble them together.

In other words, the supplementary liner plate 13 is made of stainless steel)
A reinforcing frame 1 formed by forming a cylinder into a cylindrical shape with the same diameter as the sump tank 8, and combining I-shaped steel or the like into a frame shape.
2 through the connecting A 14, and is reinforced by boiling while maintaining the cylindrical shape. In addition, the type and steel 12H constituting the reinforcing frame 12 have support legs 15 that are connected to supports of the intermediate slab 7, which will be described later, during installation.
is attached and supports! l! A bottom plate 15a, which serves as a reference surface during installation, is fixed to the lower end of I15.

θ1〇 Integration process (+), connect the sump tank 8 and reinforcing frame 12, which were made by nJM in the iD process, as shown in Figure 6.
6 to connect together.

The above steps (1) to ((0) are actually measured at a place with good working conditions such as a factory, and after the step (110) is completed, the sump tank 8, reinforcing frame 12, liner plate 13
All you have to do is bring it to the installation site.
In parallel with the steps f9'e(1) to 010, the following Q
ψ process is Example GV) Pedestal construction process Concrete is poured and the lower cylindrical part 3 of the pedestal 3 is
A is erected, and a plurality of support beams 17 for supporting the intermediate slab 7a are installed on the upper part of the lower cylindrical portion 3a.
18B is provided, and the fI
Support P of i strong frame 12! A column 19 supporting the J-leg 15 is erected, and a support plate 19 is attached to the upper part of the column 19 to serve as a reference surface for installing the sump tank 8.

(V) Installation process Subject to the completion of step 4V) above, (lii)
In the process, the sump tank 8 supported by the reinforcing frame 12 is installed on the support beam 17. In other words, the sump tank 8 supported by the reinforcing frame 12 is installed on the support plate 19a of the column 19 for 1μs1.
Place the bottom plate 15a of No. 5 on the sump tank 8 and reinforcing frame 1.
The sump tank 8 and the reinforcing frame 12 are installed on the pedestal 3. Connect to reinforcing bars (not shown).

Biasing Concrete pouring process Concrete is poured and the slab support part 3 of the pedestal 3
b and the intermediate slab 7A are integrated into a form 1j sentence.

Then, the connection between the slab support portion 3b and the intermediate slab 7A is made.
After the cleat has hardened, the upper cylindrical part 3C of the pedestal 3
Build ^4.

As is clear from the above explanation, the present invention proposes that intermediate slabs (a small number of buried sump tanks be installed in factories, etc.) where they are positioned mutually [centered and connected together]. This is a system in which the connected sump tanks are supported by a reinforcing frame, and these are installed integrally on a support installed inside the pedestal for centering. It is possible to perform accurate centering at a suitable site (in a good location), and it also reduces the man-hours required for centering at the site (in a good location) compared to when each sump tank is installed individually. This has the effect of being able to shorten the time.

[Brief explanation of drawings]

Fig. 1 shows a schematic configuration of the reactor containment vessel, Figs. 2 to 6 show an embodiment of the present invention, Fig. 2 is a plan view showing the assembled state of the sump tank, and Fig. 3 shows an assembled state of the sump tank. The figure is the second
Fig. 4 is a plan view of the Ni strong 4-volume tank supporting the sump tank, and Fig. 5 is a v-v of Fig. 4.
Cross-sectional view along arrow i, Figure 6 is after the sump tank is installed]
(It is a sectional view showing the k state. 1...Reactor containment vessel, 2...Reactor pressure vessel, 3...Pedestal, 4...Dry Well, 5...Suppression chamber,
7) [... Intermediate slab, 8... Sump tank, 9... Connecting member, 10... Holding frame,
12...Supplementary convention, 13...Liner plate, 15...Support center J116...4
Connection member, 17... Support frame, 19... Support column. Applicant Ishikawajima Pharmaceutical Insurance Co., Ltd. - Figure 1 Figure 2 Figure 3 Figure 4 Figure 1: +o L+.

Claims (1)

[Claims] In the installation method of multiple sump tanks installed in an intermediate slab that divides the interior of the pedestal supporting the reactor pressure vessel into the dry well side and the suppression chamber l1llj, multiple sump tanks are interconnected and positioned, and the connected state is The sump tank is integrally supported by a reinforcing frame, and after the reinforcing frame is installed on a support in the pedestal, concrete is poured around the sump tank to form an intermediate slab. Installation method for reactor containment vessel intermediate slab sump tank.