JPH10132980A - Construction work process for reactor housing container made of concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the term for the construction work process, lower costs required for temporary material, reduce expenditures required for works in site, and enhance quality. SOLUTION: In the construction process for a reactor housing container made of concrete at a nuclear power plant, a first step liner (L1 liner) and a second step liner (L2 liner) are made into a L1 liner member 6a and a 12 liner member 7a respectively where each of them is vertical divided into plural numbers, and the L1 liner member 6a and the L2 liner member 7a are integrally connected together so as to be formed into a liner member 13a. An equipment hatch 11 is installed onto the L2 liner member 7a at the plant or in a work site. When the liner member 13a is transported, a liner holding jig 16a is installed. When the liner member 13a is carried in the building mat of the atomic reactor at the work site in a state that it is erected, it is assembled (welding) in a ring shape so as to be formed into the L1 liner and L2 liner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete reactor in a reactor building (hereinafter referred to as R / B) installed in an improved boiling water nuclear power plant (hereinafter referred to as ABWR nuclear power plant). The present invention relates to a construction method for a containment vessel (hereinafter, referred to as RCCV).

[0002]

2. Description of the Related Art The RCWR of an ABWR nuclear power plant has been changed from a conventional steel containment type reactor containment vessel (RCV) of a BWR to a reinforced concrete liner lining type. A
The construction process of the BWR nuclear power plant is at the bottom of the RCCV (L
The critical path of the entire construction process is how to install the liner (referred to as No. 1) in a short period of time, and how to start construction RCCV construction, which is the actual start of building construction.

[0005] A conventional RCCV construction method will be described with reference to FIGS. 5 to 9. Fig. 5 is a cross-sectional view schematically showing the reactor building of ABWR, Fig. 6 is a transportation view of the RCCV liner, Fig. 7 is a local assembly procedure of the L1 liner and L2 liner, and Fig. 8 is the RCCV liner. FIG. 9 is a view showing how to install the device hatch on site.

In FIG. 5, reference numeral 1 denotes R / B, and 2 denotes RC.
CV, 3 is a reactor pressure vessel erected in RCCV2,
4 is R / B mat, 20 is RCCV rebar, 24 is construction RCC
V work is shown. The RCCV 3 is made of reinforced concrete and has an RCCV liner 5 lined.

The RCCV 2 has a steel RCCV liner 5 and a concrete wall integrally erected on an R / B mat 4 at the center of the R / B 1.
/ L in the lowermost row formed in a short ring shape on the mat 4
It is a long cylindrical body in which one liner 6 to the uppermost L5 liner 10 are sequentially stacked, welded and integrated, and the upper end is closed.

An equipment hatch 11 is attached to the second-stage L2 liner 7 from the bottom, and a diaphragm floor (hereinafter referred to as LDF) 12 is provided in the RCCV2 where the L4 liner 9 is located. The RCCV liner 5 generally uses a steel plate having a thickness of 38 mm at a portion where a large stress is likely to be generated, that is, a portion of the LDF 12, and a steel plate having a thickness of 6.4 mm at other portions.

The method of carrying these RCCV liners 5 to a predetermined position in the R / B 1 and installing the RCCV liners 5 differs depending on the lifting equipment installed when the nuclear power plant is constructed. Generally, the RCCV liner 5 is divided into an L1 liner 6, an L2 liner 7, an L3 liner 8, an LDF12, an L4 liner 9, and an L5 liner 10, and each of the liners 6 to 10 is formed into a liner member 13 of 4 to 6. The divided parts are manufactured at the factory.

Next, as shown in FIG. 6, a pipe penetration 14 is attached to the liner member 13 and the
The 6.4 mm liner member 13 is transported from the factory to the local construction site. When the liner member 13 is loaded on the transportation vehicle 15, a strong liner holding jig is used to prevent the liner member 13 from being deformed.
Attach 16 and transport to construction site.

Each transported liner member 13 has an R
7, the L1 liner 6 is first assembled in a ring shape on the assembly platen 17 as shown in FIG. 7, and the L2 liner 7 is placed on the L1 liner 6 assembled in the ring shape.
Are stacked on the L2 liner 7, and the L4 liner 9 and the L5 liner 10
And finally assembled into the integrated RCCV liner 5.

As shown in FIG. 8, the assembled liner member 13 is carried into the R / B mat 4 by the large lifting equipment 18, and the liner member 13 is integrally manufactured in a factory beforehand, and In some cases, an installation method is used in which the equipment is transported to the construction site of the power plant and installed at a predetermined location. FIG.
The center code 19 is the upper reinforcing bar on the R / B mat 4, and 20 is the RCCV.
Shows rebar.

However, if the site where the nuclear power plant is to be constructed is small, or if the large lifting equipment 18 cannot be arranged due to the layout plan of the building or interference with related facilities around the building, etc. The RCCV liner 5 must be assembled and installed by equipment (not shown).

In that case, as described above, the RCCV liner 5
Since it is difficult to lift the entire unit integrally, and the thickness of the liner member 13 used is as thin as 6.4 mm, the RCCV liner 5 is mounted on each of the L1 liners 6 to L5 liners 10 by R.
The CCV liner 5 is formed in a ring shape on the assembling platen 17, and is carried into a predetermined position of the R / B 1, and is sequentially stacked and welded at its joints and circumferences to assemble the entire RCCV liner 5. It is common to adopt.

[0013]

In such a construction method, two equipment hatches 11 attached to the L2 liner 7 shown in FIG. 5 are used for the liner member 13 because of the capacity of the small lifting equipment and the weight of the liner member 13. 13 Installed after installation.

That is, in FIG. 7, the L1 liner 6 assembled in a ring shape on the assembling platen 17 is carried into a predetermined position in the R / B 1 and then continuously moved to the upper part of the L1 liner 6.
After the two liners 7 are stacked and the circumferential welding of the L1 liner 6 and the L2 liner 7 is completed, the position where the equipment hatch 11 is to be attached is plasma-cut in a circular shape and finished by a grinder.
As shown in (1), the equipment hatch 11 is inserted from the inside, deposited on the frame 21, and the L2 liner 7 and the joint 22 of the equipment hatch 11 are welded.

In this case, as shown in FIG.
And the work scaffolding 23 for welding and the like at the joint portion 22 of the L2 liner 7 interferes with the loading of the RCCV rebar 20,
The start of RCCV construction work will be delayed.

The work scaffold 23 cannot be dismantled unless a series of operations such as welding of the L2 liner 7 and the joint 22 of the equipment hatch 11, welding, nondestructive inspection, and government office inspection are completed. The start of construction RCCV construction 24 will be delayed.

As described above, in the case of the small lifting equipment, in the construction work of the nuclear power plant, the insertion and installation of the equipment hatch 11 are critical in the entire process, and there is a problem that the construction process is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In an RCCV construction method for assembling and installing an RCCV liner at a predetermined position of a reactor building mat, a large-scale lifting facility can be used. Installation of critical RCCV liner, insertion of equipment hatch, and handing over from installation to building RCCV construction are equivalent to or better than nuclear power plant with large lifting equipment
The purpose of this invention is to provide a construction method for a concrete containment vessel that enables early start of CCV construction and can perform parallel work without interfering with other structures, and reduces on-site welding work and improves quality. And

[0019]

According to the first aspect of the present invention, a second stage (L2) liner is stacked on a short ring-shaped lowermost stage (L1) liner arranged at a predetermined position of a reactor building mat, The third stage (L3) liner is stacked on the second stage (L2) liner, the uppermost stage (Ln) liner is similarly stacked in order, and the stacked joints are welded and elongated. In a method for constructing a containment vessel made of concrete for assembling a cylindrical liner and performing rebar construction and concrete placement, a longitudinal direction is maintained so as to maintain the shapes of the first (L1) liner and the second (L2) liner. The L1 liner member and the L2 liner member having a shape divided into a plurality of pieces are formed, the L2 liner member is stacked on the L1 liner member, and the L1 liner member is integrated by welding, and the integrated L1 liner member and L2 liner member are integrated. Liner part consisting of Sequentially carried to a state in which is erected to the upper end rebar of the reactor building mat the L1 liner and L
It is characterized in that it is arranged in the same ring shape as the two liners, and then the longitudinal direction of each of the liner members is seam-welded, and then the rebar construction is started.

Conventional RCCV liners use L1 liner to L
Five liners are divided into each block, and each block is further divided into about four to five liner members, and is carried into a construction site of a nuclear power plant. On the other hand, in the present invention, the L1 liner and the L2 liner are vertically divided into an L1 liner member and an L2 liner member, these members are vertically integrated, and a device hatch is attached to the L2 liner member. Depending on the capacity of the local lifting equipment, it is usually divided vertically into four to six members and transported upright at the power plant construction site.

The L1 liner member and the L2 liner member, which have been transported, are integrated into a liner member. The liner member is transported to a predetermined position in the R / B as it is without performing the conventional ground assembly near the building. It is installed, and the vertical welded portion, which is the connecting portion between the members, is welded and assembled. According to this method, the step of attaching a critical device hatch can be omitted, and it is possible to transfer the device hatch to construction RCCV work at an early stage.

When carrying in and installing the upper RCCV liner member from the lowermost stage of the RCCV liner and the LDF, when the lowermost stage, the upper rebar on the R / B mat is completed and the LDF floor is By setting, R
Focusing on the ease with which the CCV liner can be loaded and fixed after installation, the RCCV liner and the liner holding jig are attached to the upper end rebar and LDF, respectively, in a state of being manufactured and standing upright at the factory.
It is directly loaded, installed and fixed.

The invention according to a second aspect is characterized in that a device hatch is attached to the L2 liner member before the carry-in. According to the second aspect of the present invention, since the equipment hatch is attached to the L2 liner member, it is not necessary to perform the equipment hatch attaching work on the reactor building mat, and the start time of the rebar construction can be shortened.

According to a third aspect of the present invention, a liner holding jig is attached to the integrated liner member composed of the L1 liner member and the L2 liner member before the carry-in, and the liner member is carried into the reactor building mat by a lifting equipment. Features. Claim 3
According to the invention, the liner holding jig can be simplified as compared with the conventional one, and the cost of the temporary material can be reduced.

[0025]

1 to 3 show an embodiment of a concrete containment vessel according to the present invention.
In each of the drawings, the same parts in FIGS. 5 to 9 are denoted by the same reference numerals, and description of overlapping parts will be omitted.

In this embodiment, a short ring L shown in FIG.
As shown in FIG. 1, a rectangular L1 liner member 6a and an L2 liner member 7a having curved surfaces formed in a state where the one liner 6 and the L2 liner 7 are divided into a plurality of pieces in the vertical direction as shown in FIG. The L1 liner member 6a and the L2 liner member 7a are arranged in a ring shape so that the L1 liner member 6 and the L2 liner member 7a are arranged.
Is formed.

L1 liner member 6a and L2 liner member 7a
Are connected and integrated to form a liner member 13a. The device hatch 11 is placed on the L2 liner member 7a side of the liner member 13a.
At the same time, a liner holding jig 16a is attached to the back of the liner member 13a to stand up.

The L1 liner member 6a and the L2 liner member 7a are formed by dividing the previously manufactured short ring-shaped L1 liner 6 and L2 liner 7 into a plurality of pieces in the vertical direction, that is, a curved rectangular plate. You can also.

FIG. 2 shows a case where the liner member 13a of FIG.
FIG. 3 is a mounting view showing a state in which the liner member 13 a of FIG. 1 is suspended by the small hoisting machine 25 and installed on the R / B mat 4.

In this embodiment, as shown in FIG. 3, the liner members 13a are carried into the predetermined position in the center of the R / B mat 4, are arranged in a ring shape, and the lowermost L1 liner 6 and After forming the L2 liner 7, the uppermost L
The five liners 10 are sequentially stacked, and their joints are welded to assemble a cylindrical liner. After the rebar work is performed, concrete is poured.

Here, as the L1 liner 6 and the L2 liner 7, as shown in FIG. 1, an L1 liner member 6a and an L2 liner member 7a which are divided into a plurality of pieces in the vertical direction in advance are used. The L1 liner member 6a and the L2 liner member 7a are connected and integrated in a vertically stacked state to form an integrated liner member 13a.

The liner members 13a are arranged in a ring shape on the R / B mat 4 and welded to form the L1 liner 6 and the L2 liner 7. An equipment hatch 11 is attached to the L2 liner member 7a in advance at a factory or a site.

As described above, in this embodiment, the liner member is formed by stacking and welding the L1 liner member 6a and the L2 liner member 7a which are vertically divided at the factory and integrated.
Use 13a. A liner holding jig 16a is attached to the back of the integrated liner member 13 and mounted on a transport vehicle 15 as shown in FIG.

Then, as shown in FIG. 3, the integrated liner member 13a is hung by the small hoisting machine 25 and the R / B mat 4
The upper end reinforcing bar 19 is sequentially loaded and arranged in a ring shape so as to have the shape of the L1 liner 6 and the L2 liner 7. Then, the seam welding in the vertical direction is performed on each joint from the outside, and then the rebar construction is started. I do.

Here, as shown in FIG.
Is vertically divided and transported by the transport vehicle 15 in an upright state. However, due to the lifting capacity of the factory's lifting equipment and restrictions on transportation to the power plant construction site, the equipment hatch 11 is
If it is difficult to attach the equipment hatch 11 to the L liner member 7a in the ground assembly area near the construction site when it is difficult to attach the equipment hatch 11 to the L2 liner member 7a, the equipment hatch 11 is carried into a predetermined position in the building and installed. .

The liner member 13a in which the L1 liner member 6a and the L2 liner member 7a, which can be carried in and installed through the above steps, is carried into the upper part of the upper reinforcing bar 19 on the R / B mat 4 and is lined. The temporary support base 26, the liner holding jig 16a, the upper end reinforcing bar 19 on the R / B mat 4 and the like are used to perform positioning to the normal position. In the same process, while successively installing the next integrated liner member 13a, the surfaces of the joining portions of the adjacent liner members 13a are adjusted and adjusted to form a ring.

The assembled liner member 13a is welded in the longitudinal direction of the joint from the outside, and when the outside welding is completed, the inner liner holding jig 16a is removed and removed. Next, the inside welded part is finished with a gouging grinder to finish the welded surface, undergoes weld nondestructive inspection and government office inspection, and then is handed over to the building RCCV construction 24.

According to the construction method of the containment vessel according to the present embodiment, the construction RCCV construction 24 shown in FIG. 5 only delays the start of the construction of the RCCV rebar 20 near the vertical welded portion 27 shown in FIG. The RCCV rebar 20 work other than the vicinity of the vertical welded portion 27 can be performed in parallel with the welding work, and the remaining building RCCV work 24 after the welding is completed is only the vicinity of the vertical welded portion 27. It is possible to move forward.

In the case of the conventional ring-shaped girth welding, if the girth welding of each liner member 13 is not completed, the building RCC
The start of the V-construction 24 could not be started, and the welding of the equipment hatch 11 was delayed.

In this embodiment, when the welding work of the vertical welded portion 27 as the L1 liner member and the L2 liner member is completed, the construction RCCV work 24 is started in earnest. The liner 8 will be stacked on the L2 liner 7. The L3 liner 8 can also be formed by stacking vertically divided L3 liner members like the L1 liner 6 and the L2 liner 7.

However, in general, it is difficult to stack RCCV liner members made of steel plates of the same thickness on a steel plate having a thickness of 6.4 mm, and a method of fixing the stacked L3 liners 8 is extensive. Therefore, the L3 liner-shaped RCCV liner member assembled in a ring shape on the ground
It is desirable to stack on the liner 7. Similarly, L
Since the fixing method of the DF12 is also difficult, it is preferable that the DF12 be grounded in a ring shape on the ground and stacked on the L3 liner 8.

The LCCV liner member is a 38 mm thick LD with a L4 liner 9 and an L5 liner 10 stacked on top of each other.
Since the L4 liner 9 and the L5 liner 10 with a thickness of 6.4 mm are installed vertically and integrally on the F12 and the LDF12 has a flat floor, the fixed support is relatively easy.
It is possible to stack like the L1 liner 6 and the L2 liner 7.

Next, the effects of the method of the present invention and the conventional method will be described with reference to FIG. FIG. 4 is a process chart showing a comparison between the method of the present invention and the conventional method. That is, as is apparent from FIG. 4, in the conventional method, after assembling the L1 liner and the L2 liner on the ground, first, the L1 liner is mounted on the R / B mat. Next, after mounting (stacking) the L2 liner on the L1 liner, the stacked portion of the L1 liner and the L2 liner is ring-welded. After that, the equipment hatch is attached to the L2 liner, and rebar construction is started.

In contrast, the method of the present invention mounts (stacks) blocks each having a vertically divided L1 liner and L2 liner. At this time, a device hatch is attached to the divided pieces of the L2 liner. After seam welding the split pieces of the L1 liner and the L2 liner vertically, the rebar construction is started. Therefore, according to the present invention, the period until the start of the rebar construction can be significantly reduced as compared with the conventional example.

[0045]

According to the present invention, in the construction of a nuclear power plant in which a small lifting equipment having a low lifting capacity is installed, an equipment hatch to be attached to the L2 liner which has been a neck is previously attached to the L2 liner member. To be attached, L
In the area other than the vicinity of the vertical welded parts of the 1 liner and the L2 liner, since the RCCV rebar of the building RCCV construction can be started, substantial building work can be started much earlier,
The entire nuclear power plant construction process can be shortened.

In addition, conventionally, the RCCV liner member was transported sideways, and was erected on site.
The liner holding jig for the V liner member required a strong and large temporary material. However, in the present invention, the RCCV liner member was manufactured and transported from the manufacturing stage while the RCCV liner member was in an upright state, and then moved to a predetermined position. Since it is carried in and installed, there is no need for erecting, and the liner holding jig can be simplified as compared with the conventional art, so that the cost of temporary materials can be reduced, and the site for local work can be reduced.

Further, after transporting the RCCV liner member manufactured at the factory to the construction site, immediately carry in and install it,
Eliminating on-site assembling can significantly reduce on-site construction costs and improve quality, and is also favorable for countermeasures against salt damage at nuclear power plants constructed near the coast, and can shorten the assembling period outdoors in poor environments.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a liner member used in an embodiment of a concrete reactor containment vessel construction method according to the present invention.

FIG. 2 is a perspective view showing a state in which the liner member in FIG. 1 is transported.

FIG. 3 is a conceptual diagram showing a state in which the liner member in FIG. 1 is carried into a reactor building mat.

FIG. 4 is a process chart showing a comparison between the present invention and a conventional method.

FIG. 5 is a cross-sectional view of a reactor building for explaining a conventional method of constructing a containment vessel made of concrete.

FIG. 6 is a conceptual diagram showing a state in which a conventional liner member is transported.

FIG. 7 is a perspective view showing a state where a conventional liner member is assembled on site.

FIG. 8 is a conceptual diagram showing a state where a conventional liner member is carried into a reactor building mat.

FIG. 9 is a schematic view showing a state where a device hatch is attached to a conventional liner member on site.

[Explanation of symbols]

1 ... reactor building (R / B), 2 ... concrete reactor containment vessel (RCCV), 3 ... reactor pressure vessel, 4 ... R /
B mat, 5 ... RCCV liner, 6 ... L1 liner, 6a
... L1 liner member, 7 ... L2 liner, 7a ... L2 liner member, 8 ... L3 liner, 9 ... L4 liner, 10 ... L5 liner, 11 ... device hatch, 12 ... diaphragm floor (LD
F), 13, 13a: liner member, 14: pipe penetration, 15: transportation vehicle, 16: liner holding jig, 17: assembly platen, 18: large lifting equipment, 19: upper end rebar, 20: RCCV rebar, 21… frame, 22… joint, 23… working scaffold, 24… building RCCV construction, 25… compact lifting machine, 26… temporary support base, 27
... vertical welds.

Claims (3)

[Claims] A second stage (L1) is placed on a short ring-shaped lowermost stage (L1) liner arranged at a predetermined position on a reactor building mat.
2) The liners are stacked, the third (L3) liner is stacked on the second (L2) liner, the uppermost (Ln) liner is sequentially stacked in the same manner, and the stacking is performed. In the construction method of a concrete containment vessel for performing a rebar construction and a concrete casting by welding the joint portions to assemble a long cylindrical liner, the first stage (L1) liner and the second stage (L2) liner An L1 liner member and an L2 liner member are vertically divided into a plurality of shapes so as to maintain the shape, and the L2 liner members are stacked and welded to the L1 liner member to be integrated. With the liner members composed of the L1 liner member and the L2 liner member standing upright, they are sequentially carried into the upper reinforcing bar of the reactor building mat and arranged in the same ring shape as the L1 liner and the L2 liner. After the longitudinal direction of each member is seam welded, the construction method of the concrete containment vessel, characterized in that to start the rebar construction work. 2. The method for constructing a containment vessel made of concrete according to claim 1, wherein an equipment hatch is attached to said L2 liner member before said carry-in. 3. The reactor building mat according to claim 1, wherein a liner holding jig is attached to the integrated liner member composed of the L1 liner member and the L2 liner member before the carry-in operation. 2. The construction method for a containment vessel made of concrete described in 1.