JPS6410795B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for installing a reactor containment vessel, and more particularly, to a procedure for installing a reactor containment vessel in which a reactor containment vessel and internal structures of the reactor containment vessel are installed in parallel.

Conventionally, the reactor containment vessel and the internal structures of the containment vessel were installed separately. That is, since the internal structures of the containment vessel were suspended and carried in from the upper part of the reactor containment vessel after the installation of the reactor containment vessel was completed, it was impossible to increase the size of the structural products. In addition, since the installation of piping inside the containment vessel is carried out after the installation of the reactor body foundation and reactor shielding wall is completed, it is not possible to start immediately after the reactor containment vessel pressure test, and the construction period after the containment vessel pressure test is completed. It had the disadvantage of being long.

An object of the present invention is to provide a method for installing a reactor containment vessel that simultaneously installs the reactor containment vessel and the reactor body foundation and reactor shielding wall, which are internal structures of the containment vessel, thereby shortening the construction period of a nuclear power plant. It is about providing.

The installation method of a reactor containment vessel of the present invention includes a dry well of a reactor containment vessel, a reactor body foundation that is a structure inside the containment vessel stored in the dry well of the reactor containment vessel, and the reactor body. In the method of installing a reactor shielding wall on a foundation, the internal structure of the containment vessel and the dry well of the reactor containment vessel are installed in parallel step by step, and the parallel installation work for each step is performed as described above. An installation support that is attached to the installed stage part of the containment vessel internal structure, in which the containment vessel internal structure is installed first, and the dry well of the reactor containment vessel is installed subsequently. The dry well of the reactor containment vessel and the internal structures of the containment vessel are assembled in parallel while being temporarily fixed in a predetermined position and welded. According to this method, the containment vessel The internal structures and the dry well of the reactor containment vessel are installed step by step in parallel, and by the time the dry well of the reactor containment vessel is assembled, the internal structures of the containment vessel are already in the stored state, and the reactor main body foundation is The present invention is characterized in that the piping installation work can be carried out immediately after the pressure test of the reactor containment vessel is completed, since the installation work of the piping inside the containment vessel, which should be carried out after the installation of the reactor shielding wall, can be carried out.

An embodiment of the present invention will be described below. In FIG. 1, the reactor containment vessel includes a dry well 1, a suppression chamber 2, and the dry well 1.
and a vent pipe 3 connecting the suppression chamber 2 and the suppression chamber 2. The reactor pressure vessel 4 is located within the dry well 1 and supported on the reactor body foundation 5 by foundation bolts (not shown). The reactor body foundation 5 is welded to the inner and outer surfaces of the lower part of the dry well 1, respectively, and includes foundation bolts (not shown) embedded in the pine concrete 6.
is supported by The reactor shielding wall 7 is arranged around the reactor pressure vessel 4 described above.

The procedure for installing the reactor containment vessel described above will be explained with reference to the drawings. In Figure 2, the reactor body foundation 5,
The first stage of the dry well 1a and the reactor body foundation 5a are integrated in a factory or on site on the mat concrete 6 in which the foundation bolts (not shown) of the skirt 8 are embedded. Then the third
As shown in the figure, attach the skirt 8 to the matte concrete 6.
the second dry well stage 1b and the reactor main body foundation 5b. Next, as shown in FIG. 4, the third stage dry well 1c is suspended, and a plurality of installation supports 9 are fixed to the installation fittings 10 attached to the reactor body foundation 5b and the third stage dry well 1c. Set up 3 dry wells 1c. The above-mentioned installation support 9 has a turnbuckle 11 attached thereto to enable the dimension adjustment of the third dry well stage 1c, and the joint portion of the second dry well stage 1b and the third dry well stage 1c is as shown in FIG. A setting piece 12 is attached to the outer surface of the second dry well 1b so that the dry well 1c can be easily installed. Next, as shown in FIG. 5, the reactor main body foundation 5c is suspended, and the four dry well stages 1d are suspended. The setting method is performed using the turnbuckle 10, as in the case of the three-stage dry well 1c described above. A vent pipe penetration portion 13 is provided in the four-stage dry well 1d. Next, as shown in Fig. 6, the reactor shielding wall 7a, which is approximately 1/2 of the total height of the reactor shielding wall 7, is suspended above the reactor main body foundation 5c, and the 5th stage dry well 1e is suspended and installed. Support 1
0 to the lower part of the reactor shielding wall 7a and the dry well 5th stage 1
A plurality of pieces are fixed and set to the installation fittings 10 attached to e. As shown in FIG. 8, the joint portion of the fourth dry well stage 1d and the fifth dry well stage 1e has a plurality of guide pieces 14 on the inner and outer surfaces of the four dry well stages.
are attached by welding, so that the five-stage dry well 1e can be easily set. Next, as shown in Figure 1, dry well 6 stages 1f, dry well 7 stages 1g, dry well lower flange 1
Install h. Assembly is performed according to the installation procedure of dry well 1 described above, but welding work is performed after installation and setting.
Welding work will be carried out immediately, and the suppression chamber 2 and vent pipe 3 will be attached to the dry well 1.
The concrete 16, 17 in the dry well and the concrete 15 in the reactor body foundation 5 are placed during the installation of the dry well, and the concrete 15 in the reactor body foundation 5 is performed before the dry well lower flange 1h is completed or the pressure test of the reactor containment vessel is completed. However, depending on the process, it may be possible to do this after the pressure test of the containment vessel is completed. Once the above installation work is completed, install the drywell upper flange 1.
i was installed, a pressure test was conducted on the reactor containment vessel, and the installation work was completed.

According to the present invention, since the reactor containment vessel, the reactor body foundation, and the reactor shielding wall are constructed simultaneously and in parallel, it is effective in shortening the construction period of a nuclear power plant, and the construction cost is also reduced by shortening the construction period. It is inexpensive and has excellent economic efficiency.

[Brief explanation of drawings]

Figure 1 is a vertical sectional view of the reactor containment vessel, reactor body foundation, and reactor shielding wall, Figures 2 to 6 are installation procedure explanatory diagrams showing embodiments of the present invention, and Figure 7 is A of Figure 5. 8 is a detailed view of section B in FIG. 6. 1...Dry well, 5...Reactor main body foundation,
7... Reactor shielding wall, 9... Installation support.

Claims (1)

[Claims] 1. A method of installing a dry well of a reactor containment vessel, a reactor body foundation that is a containment vessel internal structure stored in the dry well of the reactor containment vessel, and a reactor shielding wall of the reactor body foundation. In,
The internal structures of the containment vessel and the dry well of the reactor containment vessel are installed in parallel in stages, and the parallel installation work for each stage is performed by installing the internal structures of the containment vessel first, and then installing the internal structures of the containment vessel later. Temporarily fixing the dry well of the reactor containment vessel installed in a predetermined position with an installation support attached to the installed step part of the structure inside the containment vessel previously installed, and while performing welding, A method for installing a reactor containment vessel, characterized in that a dry well of the reactor containment vessel and internal structures of the containment vessel are assembled in parallel.