JPS61192986A - Piping penetrating section structure of 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] [Field of Application of the Invention] Penetration structure that enables large-scale assembly construction of living body reinforcement in the relationship between the biological reinforcement of an atomic couplant and the penetration of a nuclear reactor containment vessel. related to.

[Background of the invention]

Currently, the installation of penetration in the reactor containment vessel that is generally carried out is done before constructing the living body reinforcements, and following this procedure, the reinforcing bars are assembled in a separate location and then suspended all at once. When.

-The length of the more than 100 penetration bars attached to the primary reactor containment vessel is approximately 3,000 meters, and most of them are arranged radially, so the large-scale assembly of reinforcing bars mentioned above can be aligned horizontally and centripetally. Even if it is accessed, the centripetal opening of the penetration interferes with the reinforcing bars, making the large-assembly reinforcing bar construction method extremely difficult in practice.

[Purpose of the invention]

The purpose of the present invention is to shorten the reinforcing structure construction period, which accounts for most of the construction period for biomechanical structures, which is a critical path in the construction process of nuclear power plants. By performing the penetration after the above-mentioned reinforcing bars are constructed, it is possible to apply the reinforcing bar large-assembly construction method, and the plant construction period can be significantly shortened.

[Summary of the invention]

In order to shorten the construction period for arranging living body reinforcement, the present invention eliminates the penetration of the reactor containment vessel, which is an obstacle to the application of the reinforcing bar large assembly method, after the construction of reinforcement for living body reinforcement. It is related to the pressure resistance of the reactor containment vessel generated by removing the leakage, the installation of the penetration into the reactor containment vessel after the leakage test, and the provision of a method that makes it possible to confirm the integrity of the location.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the present invention, in which a penetration seat 7 is installed in a predetermined position in the reactor containment vessel,
Attach the temporary cap 8.

After constructing the biological body reinforcement, the penetration sleeve 4, process piping, etc. 5, and process piping heat insulating material 6 are inserted after removing the temporary cap 8, and welded and attached at the penetration seats 7 and 9 to secure the specified reactor. Configure the structure of the containment vessel piping and other penetrating parts.

Figure 2 shows an example of a cross section of the reactor building structure.
The relationship between the penetration 3 of piping etc. attached to the reactor containment vessel 1 and the biological barrier 2 is shown.

The living body 3 is made of reinforced concrete whose main structure is reinforcement arranged in a grid pattern.

Figure 3 shows the penetration through piping etc. that has been generally provided in the past, and shows the penetration sleeve 4.
is directly attached to the reactor containment vessel, and process piping, etc. 5. In the six-piece structure showing the structure in which the process piping insulation material 6 is attached, when the penetration sleeve is installed after the pressure resistance and leakage tests of the reactor containment vessel and the biological body reinforcement construction, the reactor containment vessel For example, installing a test channel 10 as shown in Figure 6 to confirm the integrity of the welding point with the reactor has a high risk of damage to the reactor containment vessel itself, and it is necessary to perform a line inspection. Unable to secure work space.

By making most of the penetrations installed in the reactor containment vessel after the pressure leakage test and the living body reinforcement construction, rather than before the single vessel pressure leakage test, it is possible to construct the living body body reinforcement in blocks. This is a proposed method.

For this reason, during the pressure leakage test of the reactor containment vessel, a temporary cap is attached to the penetration seat 7, as shown in FIG. 4.

As shown in Fig. 5, after placing the biological reinforcement and placing concrete as necessary, the penetration sleeve 4. After removing the temporary cap 8, the process piping 5 and the heat insulating material 6 for the process piping are inserted.

Next, the penetration seat 7 and the penetration sleeve 4 are fixed by welding at 9.

In order to confirm the integrity of the welding point 9, the penetration seat 7 requires a minimum length of several tens of liters to ensure a space that allows for X-ray inspection and leakage testing of the welded portion.

FIG. 6 shows a state in which a test channel 10 is attached to confirm the soundness of the welding point 9.

By attaching the penetration seat 4 to the 2M sub-reactor containment vessel in advance, the penetration sleeve can be attached to the living body reinforcement, if necessary, after concrete is poured, and the attachment can be done to ensure a sound welding point. You can check the gender.

FIG. 7 shows a modification of the test method shown in FIG. 6, in which the penetration seat 4 and the test channel 10 are welded firmly and the conduit 10 is screwed in to attach the test channel. Here's how you can do it.

〔Effect of the invention〕

Most of the penetration of the reactor containment vessel, which is an obstacle to the construction of blocks of reinforcing bars, as a way to shorten the reinforcement process of living body structures, which is a critical path in the reactor plant construction process, can be achieved by using the above-mentioned reinforcing bars blocks. By attaching it to the PCv after piling and construction, the biomechanical structure construction period will be shortened by approximately 25%, and the plant construction process will be significantly shortened.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a cross-sectional view of a structure according to an embodiment of the present invention. Figure 2 shows a longitudinal cross-sectional view of the reactor building. Figure 3 shows a cross-sectional view of a conventional structure for pipe penetration, Figure 4 shows a diagram of the situation during a pressure test after completing the assembly of the reactor containment vessel.
FIG. 5 shows a cross-sectional view of piping penetration installation after construction of the living body, and FIG. 6 shows a test method for confirming the soundness of the welded part in the present invention. FIG. 7 shows a modification of the welded part soundness confirmation method shown in FIG. 6. 1... Reactor containment vessel (steel plate structure), 2... Reinforced concrete living body surrounding the reactor containment vessel,
3... Penetration through piping, etc., 4... Penetration sleeve welded and fixed to the reactor containment vessel,
5... Process piping, 6... Heat insulating material for process piping, 7... Penetration seat, 8... Temporary closing cap used during pressure test of reactor containment vessel, 9...
・・Welded part of penetration seat 7 and penetration sleeve 4, 10・Test channel, 11・
... Conduit, 12 ... Pressure gauge, 13 ... Pressure-resistant boundary member, 14.15 ... Welded part.

Claims (1)

[Claims] 1. For pipe penetration of the reactor containment vessel, a pipe penetration mounting seat is provided, and the pipe penetration is inserted and welded into the pipe penetration mounting seat during or after construction of the reactor shield body. Reactor containment vessel piping penetration structure.