JP2003156583A - Construction method for nuclear power plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method for twin plants sharing a reactor building operating floor. SOLUTION: In a construction method for nuclear power plants in which a following plant 3 is constructed together with a preceding plant 2 with a time difference from the construction of the preceding plant 2, partition walls 5, 8 and 9 are formed from the mat 1 to the height of roofs 12 and 13 at the boundary of the two plants, construction of two plants are proceeded on both sides of the partition walls. When the preceding plant 2 is in operation, the partition wall 9 above the operating floor 10 is removed and construction of the later plant 3 is proceeded with a state covering the operating floor 10 with a partition floor.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for constructing two nuclear power plants and a method for operating the same.

[0002]

2. Description of the Related Art A structure called a twin implant in which an operating floor (hereinafter simply referred to as "opero") in a reactor building is shared by two nuclear power plants is disclosed in Japanese Patent Laid-Open No. 9-68588. ing.

Further, as a method of constructing two nuclear power plants adjacent to each other, the construction of a succeeding plant is started with a time lag with respect to the preceding plant which has begun construction, so that a specific construction machine or manpower can be saved. Avoiding concentration at a particular time is international publication number WO97 / 11467
Issued as a reissue patent.

[0004]

In the future, for example, in the construction of a twin implant of a nuclear power plant in which a facility that can be shared by the twin implants such as an operation floor in the reactor building is shared, and construction is performed with a construction time difference, In the operation plant on the preceding plant side, a controlled area is set and fuel loading work is in progress, and on the operation floor on the succeeding plant side, construction work in the non-controlled area state naturally occurs.

When the construction of the subsequent plant is hurried and the entire operation floor is set as the management area, the operation time of the operation plant of the succeeding plant is subject to restrictions such as working time in the management area, which may affect the construction process and the construction cost. , It is necessary to divide the common operation floor into the controlled area / non-controlled area.

Further, in the case where the preceding plant is in operation and the succeeding plant is carrying out fuel loading work in the operation flow control area, a method for setting the boundary of the secondary containment facility when a trouble occurs in the reactor containment vessel of the preceding plant Consideration is required.

Therefore, the main object of the present invention is to provide a method for constructing a twin implant while accommodating an optimum boundary in the construction of a twin implant for a nuclear power plant, and further, for a twin implant produced by the construction. The secondary purpose is to provide an operation method.

[0008]

The main object is to provide a method for constructing a nuclear power plant in which a subsequent nuclear power plant is constructed integrally with the preceding nuclear power plant with a delay in the construction of the preceding nuclear power plant. A partition wall is formed at the boundary of the power plant from the mat that forms the basis of the reactor building to the height of the roof, and both nuclear power plants are constructed on both sides of the partition wall, and the preceding nuclear power plant is in operation. In the case of, the partition above the operating floor is removed, and the operating floor of the preceding nuclear power plant side is covered with a partition to proceed with the construction of the subsequent nuclear power plant, and the construction of the both nuclear power plants. The operating floors of both nuclear power plants will be Serial is achieved by the construction method of a nuclear power plant, which is the operating floor of the sharing of the two nuclear power plant.

The above secondary purpose is to provide two reactor containment facilities partitioned by bulkheads, two reactor containment facilities have a common operating floor, and one reactor containment facility to In the operation method of the nuclear power plant where the operation state is continued in the other reactor containment facility even while the work involving the opening of the reactor is being performed, a floor is placed on the operating floor of the other reactor containment facility side. This is achieved by a method of operating a nuclear power plant that continues the operating state of the other reactor containment facility.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In a twin implant of a nuclear power plant, two reactor pressure vessels are installed in a common reactor building, but each reactor pressure vessel has a reactor pressure vessel. A primary containment facility for storage and a secondary containment facility surrounding the outside of the primary containment facility are provided as incidental facilities in the reactor building. Such a twin implant has a rational design in which the spent fuel pool in the reactor building and the operating floor are shared by the twin implant.

In constructing the twin implant, as shown in FIG.
Of the preceding nuclear power plant 2 (hereinafter, simply referred to as a preceding plant) is started, and a time difference of a month unit or an year unit is set at the start, and the succeeding plant 3 ( In the following, it will be simply referred to as the succeeding plant.) Both the preceding and succeeding plants will be described with reference to the drawings of the reactor building which is a facility for storing the reactor pressure vessel at the construction site. Therefore, the construction of the preceding plant means the construction of the reactor building of the preceding plant and the assembling and installation of the internal equipment inside the reactor building. The construction of the subsequent plant is the same as
It means the construction of the reactor building of the subsequent plant and the assembly and installation of the internal equipment inside the reactor building. for that reason,
In each drawing, the display range of the preceding plant 2 is the range of the first reactor building expressed in the section of the claims, and the display range of the subsequent plant 3 is the range expressed in the section of the claims. It means the range of 2 reactor buildings.

Hereinafter, the construction of a twin implant for a nuclear power plant according to an embodiment of the present invention will be described with reference to the drawings, taking a reactor building and its internal components as an example.
FIG. 1 shows the setting status of the partition wall 5 for the boundary structure of the secondary storage facility up to the spent fuel pool floor shared by the preceding and succeeding plants. The shared spent fuel pool floor for the secondary containment facility boundary configuration of the preceding plant 2 and the succeeding plant 3 according to the building construction of the preceding plant 2 from the mat 1 for shared use of the preceding / subsequent plants to the shared spent fuel pool floor 4 Partition walls 5 up to 4 are set from the mat 1 to the shared spent fuel pool floor 4. At this time, the succeeding plant 3 is constructed with a delayed time difference with respect to the preceding plant 2, and therefore, for example, the construction is performed up to the height of the first floor 6.

FIG. 2 shows a partition wall setting situation of a secondary containment facility boundary structure having four or more shared spent fuel pool floors of preceding and succeeding plants. In line with the construction work from the skeleton 7 of the shared spent fuel pool floor 4 or more of the preceding plant 2 to the roof 12, in the vertical direction passing through the boundary between the operation plant 10 on the preceding plant side and the operation flow 11 on the succeeding plant 3 side,
Shared spent fuel pool bulkhead 8 and bulkhead 9 above operation floor
To set.

The partition wall 8 in the shared spent fuel pool and the partition wall 9 above the operating floor are separable from each other. The partition wall 8 in the shared spent fuel pool and the partition wall 9 above the operating floor block the operation floor of the preceding plant 2 from the succeeding plant 3 to prevent dust from entering the operating floor of the preceding plant 2 from the succeeding plant 3. Since the succeeding plant 3 is constructed with a time lag with respect to the preceding plant, at the time of setting the shared spent fuel pool partition 8 and the partition 9 above the operating floor, the operating plant 1 on the side of the succeeding plant 3
It is under construction up to 1.

FIG. 3 shows a situation in which the preceding plant 2 is operating mechanical and electrical work before setting the control area, and the succeeding plant 3 is performing building work from the operating floor wall to the roof 12. Before the roof 12 of the preceding plant 2 is completed, the overhead crane rail 15 is loaded and installed, and the two overhead cranes 14 are loaded to complete the installation on the overhead crane rail 15, and the roof 12 of the preceding plant 2 is completed. The crane 14 is tested, and in parallel, the operation flow 11 on the succeeding plant 3 side and the operation flow 10 of the preceding plant 2 are separated by the partition 9 over the operation flow, and the preceding plant 2 of dust generated in the construction work in the succeeding plant is separated. After preventing intrusion into the operating floor 10 on the side, the operating floor mechanical and electrical work such as in-furnace construction before setting the control area is carried out by using two overhead cranes 14. Since the construction of the succeeding plant will be delayed in time relative to the construction of the preceding plant, at this time, the operating plant 1
The frame construction from 7 to roof 13 is under construction.

In this way, each partition wall 5, from the mat 1 which is the basis of the reactor building, to the height of the roofs 12 and 13.
After building 8 and 9, proceed with the construction individually on both partition sides separated by the partition without removing any partition, and remove the partition 9 after the construction on both partition sides is completed. The operation flow 11 and the operation flow 10 of both plants are communicated with each other to form an operation flow shared by both plants. The partition walls 5, 8 and 9 have a function of preventing the transmission of radiation and the movement of radioactive substances continuously in the vertical direction without a gap.

Even during the construction work, the operation environment can be secured widely by connecting the operation flow 11 and the operation flow 10 of both plants so that the operation flow is shared by both plants.
When it is desired to concentrate the use of the two overhead cranes 14 on the construction of the plant on one side, the work is sequentially advanced from the state shown in FIG. 3 to the state shown in FIGS. Hereinafter, the work to be sequentially performed will be described with reference to FIGS.

Although the work progresses from the state of FIG. 3 to the state of FIG. 4, the state of FIG. 4 shows a state in which the operation machine and electric work are being performed before the control area is set in both the preceding and succeeding plants. Since the operation of the preceding plant 2 and the succeeding plant 3 uses two overhead cranes 14, first, the partition 9 above the operating floor is temporarily removed, and then the overhead crane 14 operating in the preceding plant 2 is removed. Since it can be used in the succeeding plant 3, the overhead crane rails 15 on the preceding plant 2 side and the succeeding plant 3 side are continuously connected. In this way, the overhead crane 14 is allowed to come and go between the preceding plant 2 and the succeeding plant 3 so that the two overhead cranes 14 can be shared by both the preceding plant 2 side and the succeeding plant 3 side. Promote construction work.

FIG. 5 shows a state in which the preceding plant 2 side is operating mechanical / electrical work after setting the radiation control area and the subsequent plant 3 side is operating mechanical / electrical work before setting the radiation control area. In order to keep the operation floor of the succeeding plant 3 in the non-controlled area, first, of the overhead crane rails 15, the ceiling crane rail portion set at the upper end portion of the partition wall 9 above the operation floor is temporarily removed.

After that, the partition 9 over the operation floor which has been temporarily removed is reset on the partition wall 8 in the common spent fuel pool at the center of the operation floor. As a result, the operation flow on the side of the preceding plant 2 and the operation flow on the following plant are cut off. It should be noted that the overhead crane 14 is set as a usage group of one for the operation of the preceding plant and two for the operation of the succeeding plant.

FIG. 6 shows a state in which the preceding plant 2 is in operation, and the succeeding plant 3 is in operation for mechanical and electrical operation before setting the radiation control area. As a secondary containment facility boundary configuration method in case of a trouble in the reactor containment vessel of the preceding plant 2, the partition 9 above the operation floor is removed, and the overhead crane rails 15 of the preceding plant 2 side and the succeeding plant 3 side are connected to follow The work on the plant 3 side can be promoted by two overhead cranes 14.

Next, an operation floor partition 16 is set on the operation floor 10 on the side of the preceding plant 2, and the shared spent fuel pool floor 4 is set.
The partition wall 5 up to, the shared spent fuel pool partition wall 8, and the operation floor partition 16 form a boundary that blocks the boundary between the preceding plant 2, the space above the operation floor, and the succeeding plant 3.

The operation floor partition 16 is formed by arranging a plurality of concrete plates covered with a metal plate. Each plate of the operation floor partition 16 has a weight and a size that can be handled by the overhead crane 14. And
A seal is applied between the arranged plates. Operation floor partition 16
Has a function of preventing radiation and radioactive substances leaking to the lower part of the operation floor partition 16 from leaking to the upper part of the operation floor partition 16. In this embodiment, the operation floor 16 also covers the shared spent fuel pool.

The plates constituting the operation floor partition 16 can be hung and moved by the overhead crane 14. By the movement, it can be removed from the operation floor or spread on the operation floor.

After the plant operation of the nuclear power plant is started, the upper lid of the reactor pressure vessel is opened and the nuclear fuel in the reactor pressure vessel is rearranged or replaced with new fuel, or the inside of the reactor pressure vessel is inspected. It's time to do. At that time, a reactor open state occurs in which the upper lid of the reactor pressure vessel is opened. When the furnace is open, radiation and radioactive substances may be scattered in the operating space, so the operating space is a strict radiation control area.

FIG. 7 shows a state in which the reactor pressure vessel is opened after the operation of the preceding plant 2 and the radiation control area of the succeeding plant 3 is set, and the operation and mechanical operations are performed. In the mechanical / electrical work in the operation plant after the radiation control area of the succeeding plant 3 is set, if the operation plants of the preceding plant 2 and the succeeding plant 3 are not separated, the reactor pressure vessel after the operation of the preceding plant 2 is opened, The radiation dose of the plant 3 operation increases, the prescribed dose arrival time is shortened, and the work efficiency in the controlled area of the subsequent plant 3 is reduced. In order to suppress the decrease, first of all, among the overhead crane rails 15,
Remove the rail in the partition 9 setting range above the operation floor,
Next, by resetting the partition 9 over the operation flow that has been temporarily removed to the original state, the operation flow on the side of the preceding plant 2 and the operation flow on the side of the succeeding plant are separated and separated, and then the operation side of the preceding plant 2 is separated. Remove the operation floor partition 16,
The work is performed with the furnace open, and the mechanical / electrical work is performed on the subsequent plant 3 side under the radiation control area setting.

The open furnace state occurs even while the preceding plant and the succeeding plant are completed and both plants are in operation. For example, the state shown in FIG. That is, FIG. 8 shows the reactor open state of the reactor pressure vessel after the operation of the preceding plant 2 and the operating state of the subsequent plant 3.

A serious situation occurs when radiation or radioactive material leaks from the succeeding plant 3 into the space above the operating floor due to a trouble in the succeeding plant 3 while the preceding plant 2 is working with the furnace open. Is concerned.

Therefore, as a method of constructing the secondary containment facility boundary in the case of a trouble in the reactor containment vessel of the operating subsequent plant 3, the operating floors 16 are spread over the operating plant on the side of the subsequent plant 3 and each partition wall 5, 5. 8 and the operation floor partition 16 isolate the succeeding plant 3 from the operation floor and the preceding plant 2 side. In this way, the partition wall 5 up to the shared spent fuel pool floor, the shared spent fuel pool internal partition wall 8,
The operation floor partition 16 of the succeeding plant 3 constitutes a boundary of the succeeding plant 3. This prevents the leakage of radioactivity to the preceding plant 2 side due to a trouble in the reactor containment vessel on the succeeding plant 3 side. By operating both plants in this way, it is possible to perform post-operation maintenance and nuclear fuel handling work safely and widely using the operation floor even if the operation floor is shared between both plants and the space above the operation floor is connected between both plants. .

In this way, of the partition walls 5, 8, 9
The partition walls 5 and 8 remain after the construction of the twin implants to suppress the transmission of radiation and the passage of radioactive substances. However, in order to completely share the shared spent fuel pool, the partition wall 5, which is a part of the partition walls 5 and 8, may be left and the partition wall 8 may be removed from the shared spent fuel pool.

[0031]

As described above, according to the construction method of the present invention, when constructing a twin implant of a nuclear power plant which shares an operating floor with a time lag between the plants, the construction progress can be adjusted according to the construction progress. It is possible to construct the twin implant rationally and safely while controlling the diffusion of radiation, radioactive substances and dust by using partition walls and floors.

According to the operation method of the present invention, even if the operating floor is shared between both plants and the space above the operating floor is connected between both plants, the necessary work after operation is performed safely and widely using the operating floor. it can.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a reactor building at an early stage of construction according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a reactor building showing a partition wall setting state according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram of a reactor building showing a situation in which a starting plant according to an embodiment of the present invention is operating mechanical / electrical work before setting a control area, and a succeeding plant is performing a building construction from an operating floor wall to a roof. is there.

FIG. 4 is an explanatory diagram of a reactor building showing a state during operation of an operation / electrical machine before setting a control area in both preceding and succeeding plants according to an embodiment of the present invention.

FIG. 5 is an explanatory diagram of the reactor building showing a state in which the preceding plant according to the embodiment of the present invention is in the operation machine / electrical work after setting the control area, and the succeeding plant is in the operation machine / electric work before setting the control area. is there.

FIG. 6 shows that the preceding plant according to the embodiment of the present invention is in operation,
The subsequent plant is an explanatory view of the reactor building showing a state in which the operation floor is under mechanical and electrical work before the management area is set.

FIG. 7 is an explanatory view of the reactor building showing a state in which the preceding plant according to the embodiment of the present invention opens the reactor pressure vessel after the operation, and the succeeding plant performs the operation and mechanical operation of the operation after setting the control area. .

FIG. 8 is an explanatory diagram of the reactor building showing a state in which the preceding plant according to the embodiment of the present invention is in operation while the reactor pressure vessel is open, and the subsequent plant is in operation.

[Explanation of symbols]

1 ... Matt, 2 ... Preceding plant, 3 ... Subsequent plant, 4
… Shared spent fuel pool floor, 5… Bulkhead to shared spent fuel pool floor, 6… Floor of the subsequent plant, 7… Bridge above shared spent fuel pool floor, 8… Shared spent fuel pool internal bulkhead, 9 ... Partition wall above or above operating floor, 10 ... Operating floor of preceding plant, 11 ... Operating floor of succeeding plant, 12 ... Preceding plant roof, 13 ... Subsequent plant roof, 14 ... Overhead crane, 15 ... Overhead crane rail, 16 ... Operating floor partition, 17 ... Subsequent plant operation wall.

Continued front page    (72) Inventor Koichi Gota             3-1-1 Sachimachi, Hitachi City, Ibaraki Prefecture Stock Association             Hitachi, Ltd. Nuclear Business Division (72) Inventor Yoshio Ishinabe             1-14-1 Kanda, Uchida, Chiyoda-ku, Tokyo             Stand Plant Construction Co., Ltd.

Claims (10)

[Claims] 1. A preceding nuclear power plant having a first nuclear reactor building for housing a first nuclear reactor pressure vessel, and construction of the preceding nuclear power plant after starting construction but before completion thereof. Second to store the second reactor pressure vessel
In the method for constructing a nuclear power plant in which both the reactor buildings in the subsequent nuclear power plant having the reactor building are integrally constructed, a partition wall for partitioning the reactor buildings is formed at a boundary between the reactor buildings. Then, proceed with the construction of the both nuclear power plants in the compartments on both sides of the partition wall, and before the completion of the both nuclear power plants, remove the partition wall above the operating floor, the first atom A method for constructing a nuclear power plant, wherein the operating floors of the reactor building and the second reactor building are shared. 2. The structure according to claim 1, wherein even after the completion of the both nuclear power plants, all or a part of the partition walls on the lower side of the operating floor are left, and the remaining partition walls are connected to the first reactor building. And a method for constructing a nuclear power plant having a wall shared by the second reactor building. 3. The partition wall above the operating floor according to claim 1 or 2, wherein the partition wall above the operating floor is removed while the preceding nuclear power plant is in operation while the subsequent nuclear power plant is being constructed. A method for constructing a nuclear power plant, wherein construction of the subsequent power generation plant is proceeded with the spent fuel pool on the side of the first reactor building among the partitioned areas being covered with a partition. 4. The method of constructing a nuclear power plant according to claim 1, 2 or 3, wherein the partition wall is constructed in accordance with the construction of the first reactor building. 5. The nuclear reactor according to claim 1, 2 or 3, wherein a partition wall is provided between the reactor buildings when the operating floor on the side of the first reactor building becomes a radiation controlled area. A method for constructing a nuclear power plant, characterized in that construction work for both nuclear power plants is carried out with the reactor buildings being cut off. 6. The method according to claim 1, 2 or 3, wherein the operating floor on the first reactor building side becomes the first reactor building side before the operating floor becomes the radiation controlled area.
A method for constructing a nuclear power plant, characterized in that a partition is provided at the boundary between both reactor buildings to prevent dust intrusion while it is necessary to prevent dust intrusion to the reactor building side. 7. The operating floor mechanical / electrical work before the radiation controlled area is set in both the first reactor building and the second reactor building according to claim 1, 2 or 3. A method for constructing a nuclear power plant, characterized in that the upper partition is removed from the operating floor, and the operation is performed in a state where the interruption between the operating floors of both reactor buildings is released. 8. The nuclear reactor power plant according to claim 3, wherein when the preceding nuclear power plant is in operation and the succeeding plant is performing mechanical / electrical work on the operating floor, the first reactor building side among the partitions A method for constructing a nuclear power plant, which is characterized by covering the spent fuel pool with a partition. 9. The reactor according to claim 1, 2 or 3, wherein the reactor pressure vessel is opened in the first reactor building, and the radiation control area is set in the second reactor building. A method for constructing a nuclear power plant characterized in that a partition wall is used to block the space between the two reactor buildings during mechanical and electrical work. 10. A reactor pressure vessel reactor provided with two reactor containment facilities partitioned by bulkheads in the same building, two operating facilities shared by the two reactor containment facilities, and one of the reactor containment facilities having a reactor pressure vessel. In the method of operating a nuclear power plant in which the operating state of the other reactor containment facility is maintained even while performing work involving opening, a floor is placed on the operating floor of the other reactor containment facility side. A method of operating a nuclear power plant that continues the operating state of the other nuclear reactor containment facility.