JPS6191596A - Arrangement structure of housing for nuclear power plant - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a boiling water nuclear reactor (hereinafter simply referred to as BWR).
Concerning the building layout plan of a nuclear power plant facility using

[Background of the invention]

Overseas plants, especially in the United States, where it is easy to secure vast, flat sites, have separate buildings for each function in I-type (
The reactor building is placed in the direction of the Kubin axis (an abbreviated name indicating the positional relationship between the turbine building and the reactor building), improving accessibility during construction, but it is difficult to locate on a narrow site with mountains in the background. In Japan, where construction is inevitable, it is necessary to find ways to optimize the layout of buildings without compromising functionality such as drivability. FIG. 4 shows an example.

1 is the reactor building, 2 is the turbine building, 3 is the service building, and 4 is the control inkstone shop.

The conventional method of locating the turbine building 2 on the sea side and the reactor building 1 on the mountain side has the advantage that the required length in the Nagisa line direction is short and the overall layout can be planned compactly. The reactor building 1, which has large equipment, is sandwiched between the mountain behind it and the turbine building 2. Especially, the reactor building 1, which has large equipment, is sandwiched between the mountain behind it and the turbine building 2. (Layout based on IR inside the reactor building) In the plant, accessibility during construction will be reduced. There were such shortcomings.

Further, the access route for operators from the service building 3, which has access/exit facilities for operators, to each building is provided with dirty access and clean access 8 as shown in the figure. This separation of access is generally expressed as dirty access in the radiation control area and non-control area in the operator's entry area, and clean access in the latter. In the conventional arrangement shown in FIG. 4, both dirty and clean access routes pass through the control building and the turbine building. As shown in the figure, the clean access is connected to the adjacent nuclear reactor building 1 and turbine building 2 via the control building 4. This clean access partially penetrates into the dirty area of the turbine building 2, making the plan unfavorable for radiation management.

Also, for dirty access, control building 4
A similar problem was also raised because it penetrates the clean area of the control building 4, since it communicates with each building via the .

On the other hand, conventional main steam piping (hereinafter simply referred to as MS piping)
Route 9 was connected to the turbine building 2 at right angles to the turbine axis in the turbine building z, bent 90' within the connected turbine building 2, and sent steam to the high pressure turbine/and the low pressure turbine. Therefore, it is required that the route of these MS piping 9 and the reactor safety system equipment (reactor emergency core cooling system equipment) located in an annex inside the reactor building be isolated from system separation measures for safety. Currently, the MS piping area is separated from the reactor core to the left and right sides. These safety systems include especially large equipment such as diesel generator equipment and emergency core cooling equipment.
Maintenance, inspection, and equipment replacement are required.

For this reason, especially for diesel generator equipment, it is necessary to plan so that the equipment can be easily disassembled and transported after the power plant is installed. For this reason, a high degree of freedom in layout planning is required for diesel generator equipment. However, in the conventional arrangement, the only arrangement plan was a direction perpendicular to the turbine building 2 from the arrangement route of the MS piping 9, and therefore, the degree of freedom in arrangement was limited to installation in only one direction.

In addition, because the conventional control building has a central control room inside, it is classified as an A-class building in terms of seismic design, and is required to have a building structure that is as important for safety as a nuclear reactor building. As a result, the control building features a large-scale building structure with earthquake resistance in mind. In particular, the location of the central control room must be such that the distance to reactor building 1 and other major buildings is short, the control area surrounding the central control room can be clearly separated, and ventilation in the event of an emergency is required. It must fully satisfy the requirements such as being able to secure storage space, having sufficient retention capacity and shielding, being short in distance from service facilities, and having structural strength with sufficient seismic resistance.

Regarding the above requirements, in the conventional layout, the control building 4 was made into an independent building, which led to an increase in the size of the building layout of the entire facility, and as mentioned above, the access distance to the equipment in each room was long and complicated. In addition, piping and piping between buildings
There was also an increase in the amount of goo 2 pulls and electrical conduits.

[Purpose of the invention]

The purpose of the present invention is to install MS piping at 90° in the reactor building.
Regarding the building layout structure that connects to the turbine building by bending, we provide a compact layout design that occupies less site area for the reactor facility and is short in the Nagisa line direction, and also minimizes the access plan between buildings and the layout plan for reactor safety equipment. The purpose of this study is to provide an optimal layout plan for nuclear power plant layout, which has features such as having a degree of freedom.

[Summary of the invention]

The present invention makes the direction of the containment vessel outlet nozzle of the main steam piping parallel to the axial direction of the turbine, bends the main steam piping 90' inside the reactor building, and approaches the main steam piping from a direction perpendicular to the turbine axis inside the turbine building. This is a nuclear power plant building layout structure characterized by connecting the turbine building to the turbine building.

[Embodiments of the invention]

The present invention relates to a main cutting building arrangement structure in which MS piping is bent by 90 degrees inside the reactor building and connected to the turbine shaft in the turbine building in a direction perpendicular to the turbine shaft in the turbine building. To provide a layout plan that makes it possible to maximize the advantages peculiar to a layout that increases the degree of freedom in arranging nuclear reactor safety equipment in a building.

A comparison of the conventional layout and the layout plan according to the present invention shows that the layout system according to the present invention is advantageous because it has fewer buildings with a high earthquake resistance class in terms of structural design. Furthermore, from the viewpoint of economy, since the distance from the central control room is short, it is expected that the amount of materials such as cables, pulleys, electrical conduits, and piping lengths will be reduced, making the arrangement according to the present invention advantageous. In addition, in the past, the access route between buildings was considered to be a layout route that went through the buildings, but according to the present invention, which is adjacent to each building, the access distance and access route are improved, and it is easier to plan maintenance management of the plant. It has been advantageous.

Next, Figures 2 and 3 show layout plans in which improvements were considered in the following two items based on the shortcomings of conventional layout plans.

■Improving access planning■Increasing the degree of freedom in placing safety equipment inside the reactor building Figure 2 shows the following:
The aim was to centralize the older buildings in order to improve accessibility between each building.

In this arrangement, the central control room, which was previously housed in the control building 4, is built into the attached maple building of the reactor building l. According to the plan shown in Figure 2, the shortest access distance from the service building 3 to each building can be achieved through OT functionality, and the interference of each access route and complicated routes inside the buildings can be minimized. It is possible to directly access the target building. Furthermore, by installing a central control room and related electrical panels within the building, the Ish-resistant class building can be centralized and a rational layout plan can be made in terms of the building's architectural design. In addition, by centralizing the buildings, it is possible to minimize the amount of piping, cables, conduits, etc. that connect each building, making it a highly economical layout plan.

However, regarding the main proposal, the MS connected to the turbine building
Since the route of the piping 9 and the central control room area in the reactor building 1 are close to each other, there are problems such as the inability to ensure sufficient safety from the standpoint of maintaining the functionality of the reactor safety design.

On the other hand, FIG. 3 shows a proposed layout plan for the safety equipment in the reactor building 1, which allows the safety equipment to be placed parallel to the turbine axis. The arrangement of the cylinder and reactor building l shown in this figure has been rotated by 90 degrees compared to the conventional arrangement plan. For this reason, in addition to the planning range where reactor safety equipment could not previously be placed only in the direction perpendicular to the turbine axis, this layout plan also allows for the layout plan selection area to be used as a layout plan for reactor safety equipment. will increase (
(Increased freedom in layout planning)

However, the access plan for this project does not have an appropriate layout plan for dirty and clean access like the conventional system, and furthermore, the passage distance to each building is long, so there are problems in terms of accessibility. It has points.

FIG. 1 shows a layout plan based on the above two layout plans, which is the gist of the present invention, as a layout plan that improves accessibility and increases the degree of freedom in arranging reactor safety equipment in the reactor building. In this arrangement, the central control m1lf is located within the reactor building 1. In a power plant based on the arrangement of two reactor buildings 1, it is possible to arrange the central control rooms between adjacent units adjacent to each other. On the other hand, the reactor safety equipment 10 is installed in the annex of the reactor building 1 parallel to the turbine axis, which eliminates interference with the route of the MS piping 9 and the position of the central control room 11. For this reason, regarding the placement position of the turbine building, it is effective to reduce the amount of communication between the 1rA reactor buildings 1, and a rational L-shaped arrangement 1t (a nuclear reactor building arranged perpendicular to the turbine axis direction) is adopted. (abbreviated name indicating the positional relationship between the furnace building and turbine building).

Due to the layout plan featuring this L-shaped device, the length of the MS piping 9 tends to be somewhat longer than the conventional layout. However, regarding the MS piping 9, as a piping that sends steam from the nuclear reactor to the turbine, it is necessary to assume events such as turbine tripping and load shedding. At this time, the pressure inside the MS piping 9 rises rapidly, resulting in a high temperature state. There is a correlation between the volume of the MS piping 9 and the thermal margin when the pressure suddenly rises.The larger the internal volume of the MS piping, the more the pressure rise rate is suppressed. The larger the MS piping volume is, the more desirable it is, and the minimum value for the MS piping volume in a boiling water reactor is approximately 80m"71.For these reasons, the problem regarding the internal volume of the piping related to increasing the MS piping route of the present invention is solved. It seems that there are few.In addition, in Figure 1,
12 is a containment vessel surrounding the reactor pressure vessel 5; 6. The DMS piping 9 is taken out from the containment vessel 12 at an outlet nozzle 13 and continues from the reactor pressure vessel 5 to the turbine 6 side.

The present invention will be explained by way of a more practical example (see FIG. 5).

FIG. 5 shows a layout of a reactor building, a turbine building 2, and a service building 3 having a structure in which the route of the MS piping 9 of the present invention is bent by 90' within the reactor building 1. In FIG. 5, similarly to FIG. 1, the reactor building 1 and the turbine building 2 are an L-shaped device, and the reactor building 1 has adjacent units adjacent to each other. In addition, the central control room 11 is installed inside the reactor building 1, and the service building 3 is located on the mountain side of the reactor building.
The installation is exploding.

The MS piping 9 according to the present invention sends steam from the reactor pressure vessel 5 to the turbine 6 following the arrangement route shown in the figure.

This MS pipe 9 is bent 90' inside the reactor building and led to the turbine building.

Honai If? The embodiment shown in the figure shows the conceptual layout of the buildings, but it is an effective layout concept for sites in Japan where there are many narrow sites with short distances from the seamount and short distances in the direction of the seamount between the main buildings. Furthermore, the central control room 1 in the reactor building 1
1 has a short distance to adjacent units, has a high possibility of being shared as a management facility, and has good layout efficiency. Furthermore, since the service building 3 is installed close to the central control room 11, the accessibility to the central control room 11 is also good.

Further, the reactor safety equipment 10 in the reactor building 1 is also installed in an area separate from the electrical equipment installation area including the MS piping 9 installation area and the central control room 11. Therefore, the reactor safety system equipment 10 is arranged parallel to the turbine axis.

In a practical example characterized by the above advantages, the reactor building 1 and the turbine building 2 are arranged in the direction of the Nagisa line, so a large mobile lifting machine can be freely moved to the sea side where large equipment is brought in. It has a storage space that allows it to move around, and this large lifting machine allows large equipment for the reactor building and turbine building to be brought into the same place, which improves construction efficiency and saves time during the construction period of a nuclear power plant. Shortening is also possible.

Furthermore, since equipment can be brought in at the same location, interference with construction work can be reduced.

However, in the layout according to this practical example, the length of the site occupied in the direction of the Nagisa line is somewhat longer than in the conventional layout, but the length of the site occupied in the direction of the mountains and sea, which has a large effect on the amount of cutting during site preparation, is be shortened. For these reasons, the site's unique topography makes it attractive.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to achieve the effect that the layout of each building of a nuclear power plant can be arranged rationally.

[Brief explanation of the drawing]

Figure 1 is a nuclear power plant building layout diagram of the present invention, Figure 2
The figure is a conceptual diagram of an L-shaped layout that centralizes buildings to improve accessibility between each main building. Figure 3 shows safety parallel to the turbine axis related to reactor safety equipment inside the reactor building. Figure 4 is a conceptual diagram of a general L-shaped layout of a conventional boiling water reactor building, and Figure 5 is a conceptual diagram of a boiling water reactor according to the present invention. It is a layout conceptual diagram for explaining an example of a building.

Claims (1)

[Claims] 1. The direction of the containment vessel outlet nozzle of the main steam piping is parallel to the axial direction of the turbine, and the main steam piping is
A nuclear power plant building arrangement structure characterized in that this main steam piping is bent to connect to the turbine building from a direction perpendicular to the turbine axis inside the turbine building.