JPH0743491A - Reactor container made of steel and constructing method therefor - Google Patents

Abstract

PURPOSE:To shorten a term of works and to reduce the cost of construction by a method wherein a reactor container made of steel, which holds a reactor pressure vessel, is made large-sized blocks and conveyed in a site and it is assembled by ordinary weight-hoisting equipment along with construction of a reactor building. CONSTITUTION:Each part of a reactor container 21 made of steel is made a large-sized block and each block is prepared in an annular integral shape, shapes of three to four divisions along a circumference or a shape having a piping and others incorporated, in a factory, in consideration of conditions of conveyance and assembling work. Each kind of large-sized block is assembled in the vicinity of a reactor building 4 or on the foundation 9 of the building 4 and integrated by welding contact parts thereof. By this method, a reactor pressure vessel 2 having a reactor coolant recirculation pump 1 built in is installed on a base block 22 constructed in a space for containment. On the other hand, a doughnut pool 23 is provided in an outer peripheral lower part of the container 21, and the container 21 and the pool 23 are connected by a plurality of joining tunnels 24. Besides, a certain space is provided in the outer peripheral part of the container 21 and a wall 25 of reinforced concrete is constructed so as to support the ceiling and floors 26 of the building 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reactor containment vessel containing a reactor pressure vessel containing a reactor coolant recirculation pump, and more particularly to a steel reactor containment vessel and a construction method thereof.

[0002]

2. Description of the Related Art In a conventional reactor containment vessel for accommodating a reactor pressure vessel having a built-in reactor coolant recirculation pump, a reactor coolant recirculation pump 1 as shown in a longitudinal sectional view of FIG. The reactor containment vessel 3 for accommodating the reactor pressure vessel 2 containing therein is constructed of reinforced concrete so as to be integrated with the reactor building 4, and has a structure in which a steel plate 5 is attached and fixed.

The construction of the reactor building 4 and the concrete reactor containment vessel 3 of this structure and the installation work of the reactor pressure vessel 2 are carried out by the procedure shown in the explanatory diagrams of FIGS. 10 to 15 as follows. Has been. First, as shown in FIG. 10, the reactor building construction site is dug down to a predetermined depth to expose the bedrock 6, and after passing the inspection of the competent authority, the artificial rock 7 is driven to a predetermined thickness.

Next, anchor bolts 8 for fixing the steel plate 5 attached to the inside of the concrete reactor containment vessel 3 are buried to construct the base 9 of the reactor building 4. Also,
In parallel with this work, the steel plate 5 to be attached to the concrete reactor containment vessel 3 is manufactured in a certain size in the factory in the above-ground part, and is assembled in advance into a large block in the vicinity of the reactor building 4. The assembly surface plate 10 is installed.

When the assembly surface plate 10 is completed, the steel plate members 11 transported from the manufacturing plant are placed on the assembly surface plate 10 as shown in FIG. Turn into. The integrated steel plate block 12 has a large number of reinforcing steel members 14 attached to its outer periphery by welding in order to lift it by a large lifting facility 13 or the like to prevent deformation during lifting and movement.

[0006] On this steel plate block 12 integrated in an annular shape, the steel plate member 11 is assembled further and welded in an annular shape, and the upper and lower welded lower steel plate blocks 12 are welded together. As shown, the super-large lifting equipment 15 is assembled into a super-large steel plate block 16 that has the maximum lifting capacity.

When the base 9 of the reactor building is built up to a predetermined height, the super-large steel plate block 16 assembled on the ground is lifted to the anchor bolt 8 by the super-large lifting equipment 15 and moved to the anchor bolt 8. Stick and install. After that, on the outer peripheral portion of the super-large steel plate block 16 installed, as shown in FIG. 13, the rebar 17 is assembled and the form 18 is built, and concrete is placed between the super-large steel plate block 16 and the form 18. To do.

At the same time as the assembling of the reinforcing bar 17, the assembling of the form 18 and the concrete placing work, the steel plate member 11 to be mounted next is annularly assembled on the assembly surface plate 10 on the ground. Implement work for large blocks. The construction of the reactor building 4 is carried out in parallel with the construction work of the reinforced concrete on the outer peripheral portion of the steel plate 5 in parallel with the outer wall portion of the reactor building 4, the ceiling,
The floor will be constructed from reinforced concrete.

As shown in FIG. 14, if concrete is poured up to the height of the super-large steel plate block 16 installed first, and the strength of the reinforced concrete 19 is secured after a certain period of curing, a separate ground assembly The second-stage super-large steel plate block 16a assembled on the board 10 is suspended and mounted on the first-stage super-large steel plate block 16, and the first-stage and second-stage super-large steel plate blocks 16 and 16a are The circumference of the contact portion is welded and fixed.

Further, in the same manner as described above, the reinforcing bars 17 and the formwork 18 are erected on the outer peripheral portion of the second-stage super-large steel plate block 6a, and concrete is poured into the outer wall portion of the reactor building 4, the ceiling, Floors will be constructed in parallel and will be built on the upper floors of the reactor building 4.

As a result of the above-described repetition, when the construction of the concrete reactor containment vessel 3 with the steel plate 5 attached inside and the operation floor of the reactor building 4 proceeded, as shown in FIG. In the concrete reactor containment vessel 3, the vessel 2 is hung by the suspending device 20 and installed.
Piping work connected to the reactor pressure vessel 2 is performed, and in the reactor building 4, a wall on the operation floor surface, ceiling crane installation, roof work, and the like are performed, and the work is advanced to completion.

[0012]

In the conventional concrete reactor containment vessel 3, the steel plate 5 which is first attached and fixed to the inner surface of the concrete reactor containment vessel 3 is lined for maintaining watertightness and airtightness. In order to maintain water-tightness and air-tightness, the thickness of the steel is extremely thin, so many reinforcing steel materials can be used to prevent deformation and to withstand lifting work during construction.
It requires 14 mag.

Therefore, the reinforcing steel material 14 becomes enormous and the weight is inevitably increased. Therefore, the super-large hoisting equipment 15 having a lifting capacity several times that of the large-scale hoisting equipment 13 conventionally used for hoisting and moving. Was needed. In addition, this super-large lifting equipment 15
Requires a wide range of operation at the construction site, so its use is restricted in the layout plan of the building of the nuclear power plant, so the economic efficiency in terms of operation rate is lower than that of conventional lifting equipment. Inferior.

Further, a concrete reactor containment vessel 3
Assembly of the super-large steel plate block 16 integrated in a ring → Reinforcing bar 17 → Reinforcing formwork 18 → Concrete placement → Installation of second-stage super-large steel plate block 16a → Reinforcing bar 17 The steel bar 5 construction and the reinforced concrete construction alternate in series, as in the case of the steel bar arrangement, which inevitably prolongs the construction period of the reactor building 4 and significantly increases the construction cost as a result. There was trouble such as becoming.

An object of the present invention is to provide a steel reactor containment vessel which is made of steel and can be made into a large block, and construction cost can be reduced by using conventional lifting equipment in a short construction period. It is to provide the construction method.

[0016]

To achieve the above object, a steel reactor containment vessel for accommodating a reactor pressure vessel containing a reactor coolant recirculation pump according to the invention of claim 1 is provided with a plurality of It is characterized by combining large steel blocks.

In the construction method of the steel reactor containment vessel according to the second aspect of the present invention, the steel reactor containment vessel previously divided into large steel blocks at the production plant is manufactured in parallel with the construction of the reactor building. The feature is that they are brought to the construction site in the above process and assembled sequentially.

In the construction method of the steel reactor containment vessel according to the third aspect of the present invention, the reactor pressure vessel foundation structure and the support structure are carried in during the process of assembling the steel reactor containment vessel. It is characterized by being installed.

[0019]

According to the first aspect of the present invention, the steel reactor containment vessel is carried in a state of being divided into a plurality of large steel blocks, combined at the installation site, and assembled together by welding. According to the second aspect of the present invention, a steel reactor containment vessel in which a plurality of large steel blocks are sequentially assembled and a reinforced concrete casting of a reactor building are constructed in parallel.

According to the third aspect of the present invention, during the process of assembling the steel reactor containment vessel, the reactor pressure vessel foundation structure, the support structure and the like are loaded and installed in the steel reactor containment vessel. To do.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. It should be noted that the same components as those of the above-described conventional technique are denoted by the same reference numerals and detailed description thereof will be omitted. The steel reactor containment vessel of the first embodiment is a steel reactor containment vessel 21 made of steel as shown in the longitudinal sectional view of FIG. 1, each part of which is made into a large block, and each part thereof is a part thereof. In consideration of the transportation conditions and the assembly work, the shape of the ring is integrated, or the circumference is divided into 3 or 4 parts, or the pipe that penetrates the steel reactor containment vessel 21 is incorporated. To produce.

The various large blocks are assembled in the vicinity of the reactor building 4 or on the base 9 of the reactor building 4 and the abutting portions are joined by welding to integrally form them. A base 22 constructed in an independent storage space formed by this is installed in a reactor pressure vessel 2 having a built-in reactor coolant recirculation pump 1.
Will be installed.

On the other hand, the doughnut-shaped pool 23 is arranged below the outer periphery of the steel reactor containment vessel 21 to connect the steel reactor containment vessel 21 and the pool 23 with a plurality of connecting tunnels 24. In addition, the outer peripheral portion of the steel reactor containment vessel 21 maintains a constant gap, and a wall 25 made of reinforced concrete is constructed to support the ceiling and floor 26 of the reactor building 4, which is the upper layer of the reactor building 4. An overhead crane 27 is installed on the floor as usual.

Next, a construction method using the steel reactor containment vessel 21 of the second and third embodiments will be described with reference to the explanatory views of FIGS. 2 to 8. In the second embodiment, as shown in FIG. 2, the construction site of the reactor building is dug down to a predetermined depth to expose the bedrock 6, and after passing the inspection by the competent authority, the artificial rock 7 is struck to a predetermined thickness. Set up.

Next, anchor bolts 8 for fixing the steel reactor containment vessel 21 are buried to construct the base 9 of the reactor building 4. Further, in parallel with this work, in the manufacturing plant, the steel reactor containment vessel 21 is processed and assembled for each part, and further, in the perspective view of FIG. 3 according to the lifting capacity of the lifting equipment at the construction site ( For example, the large block 28 is divided into large blocks 28 shown in a) and the large block 29 is divided into intermediate parts shown in (b).

Regarding the large blocks 28 and 29, a certain portion is integrally formed into an annular shape and the circumference is divided into 3 to 4 parts, and a pipe 30 that penetrates the steel reactor containment vessel 21 is provided in a certain portion. Various large blocks are made in advance, such as being assembled in the steel material of the steel reactor containment vessel 21.

Next, as shown in FIG. 4, the large blocks 28 and 29 completed at the manufacturing plant are loaded on a freighter or a barge 31 and carried near the construction site, and are transported to the vicinity of the reactor building by a large transport vehicle 32. Carried. As shown in FIG. 5, the large blocks 28, 29 corresponding to, for example, the bottom portion, which have been carried in, are hoisted by the large hoisting equipment 13, aligned with the anchor bolts 8 on the reactor building base 9, and fixed by tightening the nuts. It

Next, the second-stage large blocks 28 and 29 are mounted on the ship 31
It is transported from above and mounted on the large blocks 28, 29 of the first stage, and after the alignment, the first and second stages are temporarily fixed. Further, when the welding work in the circumferential direction is completed, the large blocks 28, 29 of the first and second stages are integrated.

Further, as shown in FIG. 6, in parallel with the assembling work of the steel reactor containment vessel 21, the donut-shaped pool 23 is divided into a plurality of members, which are made into a large block at the manufacturing factory and transported to the construction site. Then, they are installed one after another by the large lifting equipment 13 and integrated into a donut shape.

Next, as a third embodiment, a steel reactor containment vessel
Once 21 has been welded to a height intermediate to a predetermined height, the base 22 which is the substructure of the reactor pressure vessel installed in the steel reactor containment vessel 21 and the reactor pressure vessel 2 are installed. Support structure for supporting connected pipes and equipment 33
Like the steel reactor containment vessel 21, it is assembled in advance into a block as large as possible at a manufacturing plant, transported to the construction site, and carried into the steel reactor containment vessel 21 for installation.

Further, after that, the steel reactor containment vessel 21 is assembled. On the other hand, the reactor building 4 is constructed completely independently except for the wall 34 around the steel reactor containment vessel 21. . As shown in FIG. 7, when the assembly of the steel reactor containment vessel 21 is completed, and the pressure leakage test and the painting work are completed, immediately the construction of the wall 34 around the steel reactor containment vessel 21 is carried out to perform the atomization. Complete the furnace building 4 in sequence.

After that, the reactor pressure vessel 2 is carried into the steel reactor containment vessel 21 by the large suspension device 20, is installed, and the pipe 30 connected to the reactor pressure vessel 2 is welded and finished. Further, the reactor building 4 installs a wall on the operation floor surface 26 and an overhead crane 27, and performs roofing work to proceed to completion.

Thus, the steel reactor containment vessel 21 of the present invention
Has a thickness of a steel plate that can be self-supporting in terms of mechanical strength, and therefore, lifting and installation work can be easily performed without requiring a large amount of reinforcing steel material 14 as in the conventional case.
The steel reactor containment vessel 21 can be assembled in the large blocks 28, 29 by removing the reinforcing steel material 14 at the manufacturing plant.

Therefore, the number of blocks to be mounted on the construction site is reduced, and the welding man-hours on the construction site are greatly reduced. Also, since the large blocks 28 and 29 do not require the super-large hoisting equipment 15 and can be carried out by using the general-purpose large hoisting equipment 13 that is used daily, the operation rate of the large hoisting equipment 13 is improved. The cost is also reduced.

As a modified example, when the conventional super-large lifting equipment 15 is used, the steel reactor containment vessel 21 is
Since it is possible to mount up to more than double the weight of the large blocks 28, 29 described in the second embodiment, as shown in FIG.
The larger block can be handled as an ultra-large block 35, and the steel reactor containment vessel 21 can be integrated in an annular shape even in the middle portion thereof, so welding work at the construction site can be greatly reduced, and The construction period can be shortened.

[0036]

As described above, according to the present invention, the reactor containment vessel can be carried in as a large steel block that can be easily transported and installed, and the construction of the reactor building containing the steel reactor containment vessel can be performed. Due to the construction method parallel to that, there is an effect that the cost can be reduced in a short construction period.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a reactor building according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a construction method according to the present invention.

FIG. 3 is a perspective view of a large block of a steel reactor containment vessel according to the first embodiment of the present invention, in which (a) is a divided upper portion,
(B) shows the divided intermediate part.

FIG. 4 is an explanatory view showing the transportation of a large block by barge in the second embodiment of the present invention.

FIG. 5 is an explanatory view of the construction method of the second embodiment according to the present invention.

FIG. 6 is an explanatory view of the construction method of the third embodiment according to the present invention.

FIG. 7 is an explanatory view of suspending a reactor pressure vessel according to the present invention.

FIG. 8 is an explanatory view of a modified example of the construction method according to the present invention.

FIG. 9 is a vertical sectional view of a conventional reactor building of a concrete reactor containment vessel.

FIG. 10 is an explanatory view of a basic construction of a conventional concrete reactor containment vessel.

FIG. 11 is an explanatory diagram of a conventional steel plate block assembly.

FIG. 12 is an explanatory diagram of movement of a conventional super-large steel plate block.

FIG. 13 is an explanatory diagram of conventional super-large steel plate block installation.

FIG. 14 is an explanatory diagram of construction of a conventional super-large steel plate block.

FIG. 15 is an explanatory diagram of conventional reactor pressure vessel suspension.

[Explanation of symbols]

1 ... Reactor coolant recirculation pump, 2 ... Reactor pressure vessel,
3 ... Concrete reactor containment vessel, 4 ... Reactor building,
5 ... steel plate, 6 ... rock, 7 ... artificial rock, 8 ... anchor bolt,
9 ... Base, 10 ... Assembly surface plate, 11 ... Steel plate member, 12 ... Steel plate block, 13 ... Large lifting equipment, 14 ... Reinforcing steel material, 15 ... Extra large lifting equipment, 16, 16a ... Extra large steel block, 17 … Reinforcing bar, 18
… Formwork, 19… Reinforced concrete, 20… Suspension device, 21
… Steel containment vessel, 22… Foundation platform, 23… Pool, 24…
Connection tunnel, 25, 34 ... Wall, 26 ... Floor, 27 ... Overhead crane, 28, 29 ... Large block, 30 ... Piping, 31 ... Barge, 32 ...
Large transport vehicle, 33 ... Support structure, 35 ... Super large block.

Claims (3)

[Claims] 1. A steel reactor containment vessel, characterized in that a reactor containment vessel containing a reactor pressure vessel containing a reactor coolant recirculation pump comprises a plurality of large steel blocks joined together. . 2. A steel reactor containment vessel, which has been manufactured by dividing it into large steel blocks in a manufacturing plant in advance, is carried into a construction site and assembled in sequence in a process parallel to the construction of a reactor building. Item 1. A construction method for a steel reactor containment vessel according to Item 1. 3. A construction method for a steel reactor containment vessel, characterized in that the reactor pressure vessel foundation structure, support structure, etc. are carried in and installed during the process of assembling the steel reactor containment vessel. The method for constructing a steel reactor containment vessel according to claim 2.