JPH0363717B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for installing a nuclear reactor containment vessel.

[Technical background of the invention]

FIG. 1 shows a conventional boiling water nuclear reactor, and is a partially cutaway side view showing a reactor containment vessel installed in a reactor building.

The reactor containment vessel 1 is installed within the reactor building 3. This reactor building 3 includes a mat 5, a shield wall 7 provided above the mat 5 and surrounding the reactor containment vessel 1, and a shield wall 7 provided above the mat 5 to surround the reactor containment vessel 1.
A grout 1 is provided between the shielding wall 7 and the reactor containment vessel 1.
1 is filled.

The reactor containment vessel 1 includes, from the bottom to the top, a bottom course 13, a lower spherical shell 1 stage 15, and a lower spherical shell 2.
The stage 17 and the vent course 19 are sequentially assembled by welding, and the cylindrical part 21 and the upper spherical shell 23 are sequentially welded to the upper part of the vent course 19, and the reactor containment vessel head 25 is attached to the upper part of the upper spherical shell 23. Detachably arranged. these,
The cylindrical portion 21, the upper spherical shell 23, and the reactor containment vessel 25 are referred to as the "upper element of the reactor containment vessel." In addition, the reactor containment vessel 1 includes a vent pipe 27.
A torus 29 is constructed via. This torus 29 is installed below the reactor containment vessel 1 and forms a suppression chamber inside.

Further, a reactor pressure vessel 31 is provided inside the reactor containment vessel 1, and this reactor pressure vessel 31 is supported by a pedestal 33. Pedestal 3
3 is erected inside the reactor containment vessel 1, reinforced with internal concrete 37, and held firmly.

The grout 11, as shown in FIG.
It has a height from the top of the mat 5 to a position near the bottom of the horizontal weld line 41A between the two lower spherical shells 17 and the vent course 19, and a sand cushion 39 is provided above the height. This sandwich 3
9 is in contact with the outside of the welding line 41A, and the welding line 41A
It is provided in an annular shape along the Furthermore, the sand cushion 39 is fixed to concrete by an upper shielding wall 7b formed above the lower shielding wall 7a. A shielding wall 7 is constituted by these lower and upper shielding walls 7a and 7b.

Further, the internal concrete 37 is placed from the bottom of the bottom course 13 to near the upper part of the weld line 41A. Of these, the annular portion that contacts the inside of the weld line 41A is the internal concrete remainder 43. Incidentally, reference numeral 41B is a welding point of the bottom course 13, the first stage 15 of the lower spherical shell, and the second stage 17 of the lower spherical shell.

Next, the installation process of the reactor containment vessel is shown in Figure 6A.
Explain with reference to. First, the pine 5 of the reactor building 3 is formed by reinforcement work and concrete pouring work. Next, the bottom course 13 is assembled on the mat 5 at the same time as the concrete placement work for the lower part 7a of the shielding wall 7 and the circumferential wall 9 is started.
After assembling the bottom course 13, one stage of lower spherical shells 15 is sequentially welded to the upper part of the bottom course 13, and further, two stages of lower spherical shells 17 are sequentially welded to the upper part of the first stage of lower spherical shells 15. After assembling the lower spherical shell 2 stage 17, the vent course 19 is assembled to the upper part of the lower spherical shell 2 stage 17, and the bottom course 13 lower spherical shell 1 stage.
A local leak test 45 is performed on the welding points 41B of the second stage 15 and 17.

This local leak test 45 is performed at the welding location 41B.
The test is carried out by covering the test channel with a test channel and pressurizing the inside of the test channel to a predetermined pressure. As a result, the pressure resistance and leakage of the welded portion 41B are inspected.

After assembling the vent course 19, the cylindrical part 21 is welded to the upper part of the vent course 19, the upper spherical shell 23 is welded to the upper part of the cylindrical part 21, and then the upper spherical shell 2 is welded to the upper part of the cylindrical part 21.
The upper elements of the reactor containment vessel head 25 are sequentially attached to the upper part of the reactor containment vessel 1 to form the upper part of the reactor containment vessel 1. In parallel with the assembly work of the upper element of the reactor containment vessel 1, after the local leak test 45 is completed, grout 11 is injected and filled into the lower part of the reactor containment vessel. As the grout 11 hardens, the pedestal 33 is assembled and the internal concrete 37 is poured (excluding the remaining internal concrete 43).

Assembling the upper element assemblies 21, 23, 25 of the reactor containment vessel 1, filling the grout 11,
After assembling the pedestal 33 and placing the internal concrete 37, an overall leak test 47 is conducted. This whole leak test 47
is performed for all welding locations except for welding location 41B.

After the overall leak test 47, reactor containment vessel 1
The exterior surface is painted 49, and concrete is poured into the remaining internal concrete portion 43. After this concrete pouring, work 51 inside the reactor containment vessel (installation of the reactor pressure vessel 31, etc.) is performed. Further, after the outer surface painting 49, a sand cushion 39 is provided to form the upper shielding wall 7b of the shielding wall 7.

[Problems with background technology]

However, in the conventional installation method of the reactor containment vessel 1 as described above, the overall leak test 47
After that, a sand cushion 39 is installed, and then concrete pouring work for the upper shielding wall 7b is performed. The above-mentioned overall leak test is performed after the assembly of the reactor containment vessel 1 is completed. Therefore, the start time of the sand cushion 39 installation work is delayed, the completion of the shielding wall 7 is delayed, and the construction period of the reactor building 3 is prolonged.

Furthermore, since the sand cushion 39 is installed after the grout 11 is completed, the sand cushion 39 must be installed in a narrow space. Therefore, the work of installing the sand cushion 39 becomes complicated and complicated, and there is also a disadvantage that work efficiency and work safety are reduced.

[Purpose of the invention]

The present invention has been made in consideration of the above facts, and an object of the present invention is to provide a method for installing a reactor containment vessel that can shorten the construction period of a reactor building.

[Summary of the invention]

In order to achieve the above object, the method for installing a reactor containment vessel according to the present invention is to assemble the bottom course, one stage of lower spherical shell, two stages of lower spherical shell, and vent course from below in order to install the lower part of the reactor containment vessel. After assembly, in parallel with the work of sequentially assembling the upper elements of the reactor containment vessel above the vent course, a leak test of the welded part between the vent course and the two lower spherical shells was performed, and after this leak test, the above This involves attaching the sand cushion to the welded part, and by completing the leak test and sand cushion installation work during the assembly of the upper part of the reactor containment vessel, it is possible to perform the work at an early stage after the assembly of the reactor containment vessel is completed. Finally, the shielding wall of the reactor building will be completed.

[Embodiments of the invention]

3 and 4 are diagrams showing a reactor containment vessel and a reactor building completed by applying the reactor containment vessel installation method according to the present invention. In both of these figures, the same parts as those in the conventional example are designated by the same reference numerals, and the explanation thereof will be omitted.

The grout 61 is composed of an inner grout 61a and an outer grout 61b. Inside grout 61
a covers the outside of the bottom course 13 and the lower spherical shell 15, and its maximum height in the radial direction is the distance from the pine 5 to the vicinity below the welding line between the first stage 15 and the second stage 17 of the lower spherical shell. be. Further, the outer grout 61b is located on the outer peripheral side of the inner grout 61a in contact with the inner grout 61a, has a substantially trapezoidal cross section, and is formed in a cylindrical or toroidal shape along the reactor containment vessel 1. Moreover, this outer grout 61b is connected to the lower spherical shell 2.
It covers the outside of the step 17, and its height is the distance from the mat 5 to the vicinity below the weld line 41A.

A sand cushion 39 is provided above the outer cloud 61b and outside the weld line 41A in the reactor containment vessel 1. The installation of this sand cushion 39 will be explained based on FIG. 5.

Pats 63 are fixed to the outer surface of the second stage of the lower spherical shell at appropriate positions in the circumferential direction, and the support members 6 are attached to the parts 63.
The support member 65 to which 5 is fixed has a support 67
The frame body 69 is supported via. This frame body 69 has a substantially L-shaped cross section and faces the outside of the welding line 41A.
It is formed in an annular shape along this weld line 41A. Sand 70 is filled into the space surrounded by the frame body 69, the two lower spherical shells 17, and the vent course 19, and the installation of the sand cushion 39 is completed. A portion of the support member 65 and the support 67 are
External grout 6 to be concreted afterwards
1b, and the frame body 69 and the support 6
The remaining part of 7 is also buried in the upper shielding wall 7b and fixed in concrete.

Next, the installation method of the reactor containment vessel will be explained based on FIG. 6B. The same reference numerals are used for steps similar to those in FIG.

First, the pine of the reactor building 3 is formed by reinforcement work and concrete pouring work. Thereafter, concrete placement of the lower shielding wall 7a and the circumferential wall 9 is started. In parallel with this concrete pouring, the bottom course 13 is assembled on the mat 5. After assembling bottom course 13, bottom course 1
A first stage of lower spherical shells 15 is sequentially welded to the upper part of the lower spherical shell 15, and two stages of lower spherical shells 17 are sequentially welded to the upper part of the first stage of lower spherical shells 15. After assembling the lower spherical shell two stages 17,
In addition to assembling the vent course 19 on the upper part, the bottom course 13, the lower spherical shell 1 stage 15, and the
Local leak test 45 of welding point 41B of stage 17
Do this. The lower shielding wall 7a is finished at the end of the local leak test 45.

After the local leak test 45 is completed, the pedestal 33 is assembled and the internal concrete 37 is placed (excluding the remaining internal concrete 43), and the internal grout 61a is formed.

On the other hand, after assembling the vent course 19, the cylindrical part 21 is assembled to the upper part of this vent course 19, the upper spherical shell 23 is assembled to the upper part of this cylindrical part 21, and the reactor containment vessel head 25 is further installed to the upper part of the upper spherical shell 23. Attach it and assemble the upper part of the reactor containment vessel 1. In parallel with the assembly work of sequentially assembling the upper elements of the reactor containment vessel 1, a local leak test 71 of the weld line 41A is performed. This local leak test 71 is performed in the same manner as the local leak test 45. After the local leak test 71 is completed and during the assembly of the upper element of the reactor containment vessel, the remaining internal concrete 43 is poured and the sand cushion 39 is attached to the outer periphery of the reactor containment vessel 1. During assembly of the upper element of the reactor containment vessel, after the sand cushion 39 is installed, the outer grout 61b is filled. A part of the support 67 for mounting the sand cushion 39 and the support member 65 are buried in the outer grout 61b when it is filled.

After completing the assembly of the upper part of the reactor containment vessel, after completing the pouring of the remaining internal concrete 43, and after filling the outer grout 61b, an overall leak test 73 is performed. This entire leak test 73 is performed on the weld line 41 which has already been leak tested.
This is done for all welding locations except for welding location A and welding location 41B.

After completion of the overall leak test 73, work inside the reactor containment vessel 51 (installation of the reactor pressure vessel 31, etc.) is carried out, and the outer surface of the reactor containment vessel 1 is painted 4.
Do 9. After this outer surface coating 49, the upper shielding wall 7b is formed. The sand cushion 39, the remainder of the support 67, and the frame 69 are buried in the upper shielding wall 7b and fixed to concrete to form an integral structure.

According to the above embodiment, the upper part 2 of the reactor containment vessel
1, 23, and 25, a local leak test 71 of the weld line 41A is performed, and the sand cushion 39 is installed, so the reactor containment vessel 1
After assembling and performing a leak test 73,
The shielding wall 7 can be completed quickly. Therefore, the construction period for the reactor building can be shortened.

Further, the grout 61 is divided into an inner grout 61a in the center and an outer grout 61b formed below the mounting position of the sand cushion 39, and after filling the inner grout 61a, the sand cushion 39 is attached, and then the outer grout 61b is Since the sand cushion 39 is filled with , the installation work of the sand cushion 39 can be carried out in a wide space, and the workability and safety of the installation work can be improved.

Furthermore, local leak test 71 of weld line 41A
Since this is performed during the assembly of the upper part of the reactor containment vessel, the concrete placement of the remaining internal concrete 43 can be completed during the assembly of the upper part of the reactor containment vessel, and the reactor pressure vessel 31 arrangement etc. Construction inside the containment vessel 2 can be started immediately after the overall leak test 73.

〔Effect of the invention〕

As described above, according to the method for installing a nuclear reactor and containment vessel according to the present invention, welding of the vent course and the two lower spherical shells is performed in parallel with the sequential assembly work of the upper element assembly of the reactor containment vessel. By performing a leak test on the welded part and installing the sand cushion on the welded part after the leak test, the shielding wall of the reactor building can be completed early after the assembly of the reactor containment vessel is completed. This has the effect of shortening the construction period for the reactor building.

[Brief explanation of drawings]

Figure 1 is a partially cutaway side view showing a conventional reactor containment vessel installed in a reactor building;
The figure is an enlarged sectional view of the lower part of the reactor containment vessel, and Fig. 3 is a partial cutaway showing the reactor containment vessel and reactor building completed by applying the reactor containment vessel installation method according to the present invention. Side view, Figure 4 is the 3rd
Figure 5 is a side view showing the sand cushion attached to the reactor containment vessel; Figure 6 is a diagram showing the installation process of the reactor containment vessel. Figure B is a sequence diagram showing the installation process of a reactor containment vessel according to the present invention, and Figure A is a sequence diagram showing the installation process of a conventional reactor containment vessel. 1...Reactor containment vessel, 3...Reactor building, 1
3...Bottom course, 15...Lower spherical shell 1 stage, 1
7...2 lower spherical shells, 19...Bent course, 2
1... Cylindrical part, 23... Upper spherical shell, 25... Reactor containment vessel head, 39... Sand cushion,
41A... Welding line, 43... Internal concrete remainder, 61... Grout, 61a... Inner grout, 61b... Outer grout, 71... Local leak test.

Claims (1)

[Claims] 1. After assembling the lower part of the reactor containment vessel by sequentially assembling the bottom course, the first stage of lower spherical shell, the second stage of lower spherical shell, and the vent course from below, the reactor containment vessel is installed above the vent course. In parallel with the work of sequentially assembling the upper elements of the invention, a leak test is performed on the welded part between the vent course and the two lower spherical shells, and after this leak test, the work of installing a sand cushion to the welded part is performed. How to install a reactor containment vessel. 2. A grout filling operation is performed below the outside of the reactor containment vessel up to the vicinity of the lower part of the weld line in parallel with the upper element assembly operation of the reactor containment vessel, and the grout filling operation is performed on the bottom course and the vicinity of the weld line. It is divided into an inner grout formed below the first stage of the lower spherical shell and an outer grout formed below the second stage of the lower spherical shell. After filling the inner grout, the sand cushion is attached, and then the A method for installing a nuclear reactor containment vessel according to claim 1, which comprises filling the outer grout. 3. The work of placing internal concrete, which is placed in the lower part of the reactor containment vessel up to the vicinity above the front weld line, is carried out in parallel with the work of assembling the upper element of the reactor containment vessel, and According to the first aspect of the present invention, the pouring work is such that the pouring work of the remaining internal concrete that comes into contact with the welded portion is started after the end of the leak test and is completed by the end of the assembly of the upper element of the reactor containment vessel. Installation method of reactor containment vessel described in Section 1.