Nuclear power generation plant

Abstract

This nuclear power generation plant is characterized by including outer walls 4a and 4b capable of protecting a nuclear reactor building 3a and a peripheral building 3b against external flying objects, so that safety equipment, which has a portion in communication with the outside for air supply / exhaust, seawater cooling and the like and which is vulnerable to external hazards, can be protected against external flying objects and can be arranged in a compact manner. Auxiliary buildings include: buildings 1a, 1b, and 1c for storing safety equipment having a portion in communication with the outside; and buildings 2a, 2b, and 2c for storing equipment related to the safety equipment having a portion in communication with the outside. The auxiliary buildings consist of an a-series, a b-series, and a c-series. The c-series of the auxiliary buildings, the nuclear reactor building 3a having the outer wall 4a capable of protecting against external flying objects, and the peripheral building 3b are arranged on a straight line with the nuclear reactor building 3a at the center. The a-series and b-series of the auxiliary buildings are arranged in a direction different from the arrangement direction of the nuclear reactor building 3a so as to sandwich the nuclear reactor building 3a arranged on the straight line.

Description

nuclear power plant

[0001] The present invention relates to a nuclear power plant, and more particularly to a nuclear power plant suitable for use in a nuclear power plant that is provided with measures to protect against external hazards such as an aircraft crash.

[0002] In recent nuclear power plants, efforts are being made to maintain safety functions against collisions of external objects, such as large aircraft crashes, with reactor buildings. Physical protection of the necessary safety equipment installed within the reactor building is being considered by strengthening the outer walls of the reactor building.

[0003] 2. Description of the Related Art A "nuclear reactor building of a nuclear power plant" is known that is provided with an impact buffer device to mitigate the impact of a collision of an external object such as a large aircraft with the reactor building (see, for example, Patent Document 1).

[0004] In the "reactor building of a nuclear power plant" described in Patent Document 1, an impact buffer device capable of catching flying objects is provided on the outer wall covering the reactor containment vessel, and according to the "reactor building of a nuclear power plant" described in Patent Document 1, by attaching divided panel-shaped impact buffer devices at regular intervals to the outer wall, it is possible to avoid the direct effects of damage to the outer wall and vibrations that may result from the collision of flying objects.

[0005] Furthermore, there is known a "nuclear power plant" in which buildings that are not directly related to the safety of the plant are arranged adjacent to a building to be protected that houses equipment having safety functions in the nuclear power plant, thereby protecting an area in which multiplexed systems or equipment are arranged in parallel, separated by partition walls (see, for example, Patent Document 2).

[0006] Patent Document 2 describes that in order to provide a nuclear power plant that can ensure safety against external flying objects such as aircraft by maintaining the basic building structure of the past and optimizing the room layout and building group arrangement within the buildings, the nuclear power plant has protected buildings including the reactor building, central control room building, and other buildings related to the safety of the nuclear power plant, and non-protected buildings that are arranged surrounding the protected buildings and include buildings that are not directly related to the safety of the nuclear power plant, and that external flying objects such as aircraft will first collide with the non-protected buildings, thereby avoiding direct collision with the protected buildings.

[0007] Japanese Patent Laid-Open No. 4-98197 Japanese Patent Laid-Open No. 2010-96700

[0008] Among the safety equipment installed in nuclear power plants, equipment such as emergency generators and reactor containment vessel cooling equipment has external communication points such as intake and exhaust air, and seawater intake and discharge, making it vulnerable to external hazards.

[0009] It is thought that these facilities can be multiplexed (having multiple devices with the same function) and dispersed in different locations to prevent simultaneous loss of function, but there are many challenges in terms of their placement, including restrictions on installation locations due to earthquake and tsunami countermeasures, and the need to find a rational placement that takes into account external hazard conditions in addition to these restrictions.

[0010] Furthermore, in the above-mentioned Patent Document 1, an impact buffer device in the form of a divided panel that can receive flying objects is provided on the outer wall that covers the reactor containment vessel, and by providing this impact buffer device, direct effects of damage to the outer wall and vibrations that may occur due to the collision of flying objects are avoided.

[0011] However, in Patent Document 1, when taking into consideration the collision of a large aircraft, there is a problem in that, in the event of a fuel fire occurring in the event of a collision of a large aircraft, among the safety equipment of the nuclear power plant, equipment such as the emergency generator and reactor containment vessel cooling equipment may become incompletely protected due to the spread of fire from points communicating with the outside, such as the intake and exhaust air, and the intake and discharge of seawater.

[0012] Furthermore, in the above-mentioned Patent Document 2, buildings surrounding the building to be protected that are not directly related to the safety of the plant are at risk of being damaged by external flying objects, and if these buildings collapse, they could be damaged by blocking points that communicate with the outside and are contained in the building to be protected, or by fuel fires that occur in the event of an aircraft collision, which poses particular problems when surrounding buildings are installed in close proximity.

[0013] The present invention has been made in consideration of the above points, and an object of the present invention is to provide a nuclear power plant that can protect safety equipment that is vulnerable to external hazards and has points of communication with the outside, such as intake and exhaust air, seawater cooling, etc., from external flying objects and that can be arranged in a compact manner.

[0014] In order to achieve the above-mentioned object, the nuclear power plant of the present invention is a nuclear power plant comprising a reactor building in which a nuclear reactor and equipment for maintaining the safety functions of the reactor are installed, and two or more auxiliary buildings in which at least equipment that requires supply from or discharge to the outside, among the equipment for maintaining the safety functions of the reactor, is installed, and the nuclear power plant is characterized in that the reactor building has an outer wall that can protect against external flying objects, and the auxiliary buildings are arranged on either side of the reactor building that has the protective outer wall.

[0015] More specifically, in order to achieve the above object, the nuclear power plant of the present invention is characterized in that the auxiliary building comprises a series a, b, and c, each of which is made up of a building that houses safety equipment having a communicating part with the outside and a building that houses equipment related to the safety equipment having a communicating part with the outside, the a series and the b series of the auxiliary building are arranged on either side of the reactor building that has the outer wall that can protect against the external missiles, and the c series of the auxiliary building is arranged in a direction different from the arrangement direction of the a series and the b series of the auxiliary building, and a part of the outer wall of the c series of the auxiliary building is configured to be able to protect against the external missiles, or Alternatively, the auxiliary buildings comprise a series, b series, and c series, each of which is composed of a building housing safety equipment having a communicating part with the outside and a building housing equipment related to the safety equipment having a communicating part with the outside, and the auxiliary buildings of the a series and the b series are composed of two buildings housing safety equipment having a communicating part with the outside and one building housing equipment related to the safety equipment having a communicating part with the outside, and the auxiliary buildings of the c series are composed of one building housing equipment related to the safety equipment having a communicating part with the outside, and the a series and b series of the auxiliary buildings are arranged on either side of the reactor building, which has an outer wall that can protect against the external flying objects, and the auxiliary buildings of the c series are arranged in a direction different from the arrangement direction of the a series and b series of the auxiliary buildings, and the outer wall of the auxiliary building of the c series is configured to be able to protect against the external flying objects.

[0016] According to the present invention, safety equipment that is vulnerable to external hazards and has external communication points such as air intake and exhaust, seawater cooling, etc. can be protected from external flying objects and can be arranged compactly.

[0017] Fig. 1 is a schematic configuration diagram of a nuclear power plant according to a first embodiment of the present invention, showing the relative positions of a reactor building and a plurality of auxiliary buildings. Fig. 2 is a schematic configuration diagram of a nuclear power plant according to a second embodiment of the present invention. Fig. 3 is a schematic configuration diagram for explaining that the auxiliary building is set at a height that will prevent external flying objects from colliding with it in the nuclear power plant according to the first embodiment of the present invention. Fig. 4 is a schematic configuration diagram showing the relative positions of a reactor building and a plurality of auxiliary buildings in a nuclear power plant according to a different embodiment from that of the first embodiment.

[0018] The nuclear power plant of the present invention will be described below based on the illustrated embodiment. In each drawing, the same reference numerals are used for the same components.

[0019] The nuclear power plant of the present invention comprises a reactor building in which a nuclear reactor and equipment for maintaining the safety functions of the reactor are installed, and two or more auxiliary buildings in which at least equipment that needs to be supplied from or discharged to the outside, among the equipment for maintaining the safety functions of the reactor, is installed, and the nuclear power plant is characterized in that the reactor building has an outer wall that can be protected against external flying objects, and the auxiliary buildings are arranged on either side of the reactor building having the protective outer wall. A specific description will be given below.

[0020] FIG. 1 shows a nuclear power plant according to a first embodiment of the present invention.

[0021] As shown in FIG. 1 , the nuclear power plant of this embodiment is roughly configured to include a reactor building 3 a in which a reactor (not shown) and equipment for maintaining the safety functions of the reactor (for example, an emergency generator, a reactor containment vessel cooling system, etc.) are installed, surrounding buildings (for example, turbine buildings) 3 b arranged around the reactor building 3 a, auxiliary buildings (referenced 1 a, 1 b, and 1 c described below) in which at least safety equipment that requires a supply from or discharge to the outside of the equipment for maintaining the safety functions of the reactor is installed (air intake and exhaust equipment for an air-cooled generator, seawater cooling equipment or air cooling equipment for a reactor containment vessel cooling system, an exhaust port for a filter vent system, external connection ports for cooling water, inert gas, power supply, etc.), and auxiliary buildings (referenced 2 a, 2 b, and 2 c described below) in which at least related equipment for the safety equipment that requires a supply from or discharge to the outside (air-cooled generator and power supply equipment, cooling water circulation equipment for a reactor containment vessel cooling system, filter vent equipment, etc.) is installed.

[0022] In this embodiment, the reactor building 3a and the surrounding buildings 3b have outer walls 4a and 4b that can protect against external flying objects (for example, large aircraft), and the auxiliary buildings are made up of buildings 1a, 1b, and 1c that house safety equipment that has a communication point with the outside, and buildings 2a, 2b, and 2c that house equipment related to the safety equipment that has a communication point with the outside. The auxiliary buildings are made up of three series, a series (reference numerals 1a and 2a), b series (reference numerals 1b and 2b), and c series (reference numerals 1c and 2c). The c series of the auxiliary buildings and the The reactor building 3a, which has an outer wall 4a that can protect against objects, and the surrounding buildings 3b are arranged in a straight line in the vertical direction of Figure 1, with the reactor building 3a at the center (middle), and the auxiliary buildings series a and b are arranged on either side of this straight-line reactor building 3a in a direction (horizontal direction (A direction) in Figure 1) different from the arrangement direction of the reactor building 3a (vertical direction in Figure 1), and the auxiliary buildings series c (1c, 2c) are arranged in a vertically downward direction (B direction) from the A direction in Figure 1.

[0023] More specifically, the a-series and b-series of auxiliary buildings are arranged on either side of the reactor building 3a, which has an outer wall 4a that can protect against external flying objects, and the c-series of auxiliary buildings (1c, 2c) are arranged on a different side of the outer wall 4a (lower side in Figure 1) of the reactor building 3a than the outer wall 4a of the reactor building 3a on which the a-series (1a, 2a) and b-series (1b, 2b) of the auxiliary buildings are arranged, and part of the outer wall 4c of the c-series of auxiliary buildings is configured to be able to protect against external flying objects.

[0024] The outer walls 4a, 4b, 4c capable of protecting against the above-mentioned external flying objects are concrete walls having a thickness that can prevent the outer walls 4a, 4b, 4c from being penetrated by collisions with external flying objects, or the outer walls 4a, 4b, 4c capable of protecting against external flying objects may be composed of a plurality of concrete walls including the inner walls of the reactor building 3a in addition to the outer concrete walls having a thickness that can prevent the outer walls 4a, 4b, 4c from being penetrated by collisions with external flying objects, and may have a thickness that can prevent peeling off of the back surfaces of the outer walls 4a, 4b, 4c.

[0025] As shown in Figure 3, the auxiliary buildings 1a, 2a, 1b, and 2b of series a and b, which are arranged on either side of the reactor building 3 having an outer wall 4a capable of protecting against external flying objects, are set at heights that will prevent external flying objects from colliding with the auxiliary buildings 1a, 2a, 1b, and 2b, based on a flight route 5 that takes into account the maximum descent angle of the expected external flying object (for example, 10°, taking into account the maximum controllable descent angle of a large aircraft).In the figure, reference numeral 6 denotes the ground that supports the reactor building 3 and the auxiliary buildings 1a, 2a, 1b, and 2b of series a and b.

[0026] FIG. 4 shows the layout relationship between a reactor building 3a and a plurality of auxiliary buildings 1a, 1b, 1c, 2a, 2b, and 2c in a nuclear power plant according to the present invention, which is different from that in the first embodiment.

[0027] In the first embodiment shown in FIG. 1, the a-series and b-series of the auxiliary buildings are arranged on either side of the reactor building 3a having an outer wall 4a that can protect against external flying objects, and the c-series of the auxiliary buildings (1c, 2c) are arranged on the side of the outer wall 4a (lower side in FIG. 1) 4a of the reactor building 3a that is different from the outer wall 4a of the reactor building 3a on which the a-series (1a, 2a) and b-series (1b, 2b) of the auxiliary buildings are arranged. The buildings' a series (1a, 2a) and b series (1b, 2b) are arranged in different positions (vertically offset in Figure 1) relative to the outer wall 4a of the reactor building 3a, with the reactor building 3a in between, and the auxiliary building's c series (1c, 2c) is arranged on a different side of the outer wall 4a of the reactor building 3a (the lower side in Figure 1) 4a than the outer wall 4a of the reactor building 3a on which the auxiliary building's a series (1a, 2a) and b series (1b, 2b) are arranged.

[0028] In Figure 4, the c series of auxiliary buildings, the reactor building 3a with outer walls 4a capable of protecting against external flying objects, and the surrounding buildings 3b are arranged in a straight line in the vertical direction of Figure 4 with the reactor building 3a at the center (middle), and the a series and b series of auxiliary buildings are arranged on either side of the reactor building 3a arranged in this straight line in a direction (diagonal horizontal direction (direction A) in Figure 4) different from the arrangement direction of the reactor building 3a (vertical direction in Figure 4), and the c series of auxiliary buildings (1c, 2c) are arranged diagonally downward vertically (direction B) from the A direction in Figure 4.

[0029] According to the configuration of this embodiment, safety equipment that is vulnerable to external hazards and has points of communication with the outside, such as air intake and exhaust, seawater cooling, etc., is housed in a separate building (auxiliary building), so the reactor building 3a can be made compact. Furthermore, by installing the auxiliary building that houses the vulnerable safety equipment between buildings that are robust against external missiles (buildings with exterior walls that can protect against external missiles), it is possible to maintain the functionality of safety functions against the ripple effects of the collapse of the surrounding buildings 3b, etc., and against aircraft fires, and a compact arrangement is possible.

[0030] Therefore, by adopting the configuration of this embodiment, it is possible to protect safety equipment that is vulnerable to external hazards and has points of communication with the outside, such as air intake and exhaust, seawater cooling, etc., from external flying objects, and it is also possible to arrange it in a compact manner.

[0031] Furthermore, in this embodiment, the auxiliary buildings, which are made up of buildings 1a, 1b, and 1c that house safety equipment having points of communication with the outside and buildings 2a, 2b, and 2c that house equipment related to the safety equipment having points of communication with the outside, are configured into three systems: system a (reference numerals 1a and 2a), system b (reference numerals 1b and 2b), and system c (reference numerals 1c and 2c). Therefore, even if one system (for example, system a) is destroyed by an external flying object and another system (for example, system c) breaks down, the remaining system (for example, system b) remains sound, and the safety of the nuclear power plant is ensured.

[0032] FIG. 2 shows a second embodiment of the nuclear power plant according to the present invention.

[0033] In the first embodiment described in FIG. 1, of the auxiliary buildings 1c and 2c of the c-series, the lower part of the auxiliary building 1c is not covered with an outer wall 4c capable of protecting against external flying objects, so there is a risk that external flying objects may collide with the auxiliary building 1c from this point and cause destruction. The second embodiment addresses this issue.

[0034] That is, in this embodiment, as shown in FIG. 2, the auxiliary buildings of the a-series and b-series are composed of two buildings (reference numerals 1a and 1c1, 1b and 1c2) that house safety equipment having a communicating part with the outside and one building (reference numerals 2a and 2b) that houses equipment related to the safety equipment having a communicating part with the outside, and the auxiliary building of the c-series is composed of one building (reference numeral 2c) that houses equipment related to the safety equipment having a communicating part with the outside, and the auxiliary buildings are sandwiched between the reactor building 3a that has an outer wall 4a that can protect against external flying objects. The auxiliary buildings are arranged in the a series (auxiliary buildings referenced 1a, 1c1, 2a) and b series (auxiliary buildings referenced 1b, 1c2, 2b), and the auxiliary buildings of the c series (referenced 2c) are arranged in a direction (downward in Figure 2) different from the arrangement direction (horizontal direction in Figure 2) of the a series (referenced 1a, 1c1, 2a) and b series rows (referenced 1b, 1c2, 2b), and the outer wall 4c of the auxiliary building of the c series (referenced 2c) is configured to surround (cover) the entire periphery of the auxiliary building 2c, allowing protection against external flying objects.

[0035] Specifically, the auxiliary buildings' series a (1a, 1c1, 2a) and series b (1b, 1c2, 2b) are arranged in a straight line in the horizontal direction in Figure 2, with the reactor building 3a in between, and the auxiliary buildings' series c (2c) are arranged on a different side of the reactor building 3a's outer wall (lower side in Figure 2) from the outer wall 4a of the reactor building 3a on which the auxiliary buildings' series a (1a, 1c1, 2a) and b (1b, 1c2, 2b) are arranged, and the outer wall 4c of the auxiliary building for the series c (symbol 2c) is configured to surround (cover) the entire periphery of the auxiliary building 2c, allowing protection against external flying objects.

[0036] The outer walls 4a, 4b, 4c capable of protecting against the above-mentioned external flying objects are concrete walls having a thickness that can prevent the outer walls 4a, 4b, 4c from being penetrated by collisions with external flying objects, or the outer walls 4a, 4b, 4c capable of protecting against external flying objects may be composed of a plurality of concrete walls including the inner walls of the reactor building 3a in addition to the outer concrete walls having a thickness that can prevent the outer walls 4a, 4b, 4c from being penetrated by collisions with external flying objects, and may have a thickness that can prevent peeling off of the back surfaces of the outer walls 4a, 4b, 4c.

[0037] Although not specifically shown, the auxiliary buildings of the a series (reference numerals 1a, 1c1, 2a) and the b series (reference numerals 1b, 1c2, 2b) arranged on either side of the reactor building 3a having an outer wall 4a capable of protecting against external flying objects are set at heights that will prevent external flying objects from colliding with the auxiliary buildings 1a, 1c1, 2a, 1b, 1c2, 2b based on a flight route 5 that takes into account the maximum descent angle of the expected external flying object (for example, 10° taking into account the maximum controllable descent angle of a large aircraft), as in the first embodiment.

[0038] Furthermore, although not specifically shown, in FIG. 2, as in FIG. 4, the a-series (1a, 1c1, 2a) and b-series (1b, 1c2, 2b) of the auxiliary building are arranged in different positions (positions shifted vertically in FIG. 2) with respect to the outer wall 4a of the reactor building 3a, with the reactor building 3a in between, and it goes without saying that the c-series (2c) of the auxiliary building may be arranged on a side of the outer wall 4a of the reactor building 3a (lower side in FIG. 2) different from the outer wall 4a of the reactor building 3a on which the a-series (1a, 1c1, 2a) and b-series (1b, 1c2, 2b) of the auxiliary building are arranged.

[0039] With the configuration of this embodiment, it is possible to obtain the same effects as in the first embodiment, and also to have the effect that the auxiliary building 2c of the c series is covered on its entire periphery with an outer wall 4c that can protect against external flying objects, so that even if an external flying object comes flying in from below, there is no possibility that the auxiliary building 2c of the c series will be destroyed.

[0040] The present invention is not limited to the above-described embodiments, but includes various modifications. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those including all of the described configurations. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is possible to add, delete, or replace part of the configuration of each embodiment with other configurations.

[0041] 1a, 1b, 1c, 1c1, 1c2... Auxiliary buildings in which safety equipment that requires external supply or external discharge is located, 2a, 2b, 2c... Auxiliary buildings in which related equipment for safety equipment that requires external supply or external discharge is located, 3, 3a... Reactor building, 3b... Surrounding buildings, 4a... Outer wall of reactor building, 4b... Outer wall of surrounding buildings, 4c... Outer wall of auxiliary building of c series, 5... Flight route, 6... Ground.

Claims

1. A nuclear power plant comprising a reactor building in which a nuclear reactor and equipment for maintaining the safety functions of the reactor are installed, and two or more auxiliary buildings in which at least equipment that requires external supply or external discharge, among the equipment for maintaining the safety functions of the reactor, is installed, wherein the reactor building has an outer wall that can protect against external flying objects, and the auxiliary buildings are arranged on either side of the reactor building that has the protective outer wall.

2. A nuclear power plant as claimed in claim 1, wherein the auxiliary building comprises a series a, b and c, each consisting of a building housing safety equipment having a communicating part with the outside and a building housing equipment related to the safety equipment having a communicating part with the outside, and the a and b series of the auxiliary building are arranged on either side of the reactor building, which has an outer wall capable of protecting against the external flying object, and the c series of the auxiliary building is arranged in a direction different from the arrangement direction of the a and b series of the auxiliary building, and a part of the outer wall of the c series of the auxiliary building is configured to be able to protect against the external flying object.

3. A nuclear power plant according to claim 2, wherein the a-series and the b-series of the auxiliary building are arranged in a straight line with the reactor building in between, and the c-series of the auxiliary building is arranged on a side of the outer wall of the reactor building that is different from the side of the outer wall of the reactor building on which the a-series and the b-series of the auxiliary building are arranged.

4. A nuclear power plant according to claim 2, wherein the a-series and the b-series of the auxiliary building are arranged at different positions (offset positions) relative to the outer wall of the reactor building, with the reactor building in between, and the c-series of the auxiliary building is arranged on a side of the outer wall of the reactor building that is different from the side of the outer wall of the reactor building on which the a-series and the b-series of the auxiliary building are arranged.

5. A nuclear power plant as claimed in claim 2, wherein the auxiliary buildings of the a series and the b series, which are arranged on either side of the reactor building having the outer wall capable of protecting against the external flying object, are set at a height that prevents the external flying object from colliding with the auxiliary buildings, based on a flight route that takes into account the maximum descent angle of the expected external flying object.

6. A nuclear power plant as claimed in claim 1, wherein the auxiliary buildings comprise a series, b series and c series, each of which is made up of a building housing safety equipment having a communicating part with the outside and a building housing equipment related to the safety equipment having a communicating part with the outside; the auxiliary buildings of the a series and the b series are made up of two buildings housing safety equipment having a communicating part with the outside and one building housing equipment related to the safety equipment having a communicating part with the outside; the auxiliary building of the c series is made up of one building housing equipment related to the safety equipment having a communicating part with the outside; the a series and b series of auxiliary buildings are arranged on either side of the reactor building, which has an outer wall that can protect against the external missiles, and the auxiliary building of the c series is arranged in a direction different from the arrangement direction of the a series and b series of auxiliary buildings, and the outer wall of the auxiliary building of the c series is configured to be able to protect against the external missiles.

7. A nuclear power plant according to claim 6, wherein the a-series and b-series of the auxiliary building are arranged in a straight line with the reactor building in between, and the c-series of the auxiliary building is arranged on a side of the outer wall of the reactor building that is different from the side of the outer wall of the reactor building on which the a-series and b-series of the auxiliary building are arranged.

8. A nuclear power plant according to claim 6, wherein the a-series and the b-series of the auxiliary building are arranged at different positions (shifted positions) relative to the outer wall of the reactor building, with the reactor building in between, and the c-series of the auxiliary building is arranged on a side of the outer wall of the reactor building that is different from the side of the outer wall of the reactor building on which the a-series and the b-series of the auxiliary building are arranged.

9. A nuclear power plant as described in claim 6, wherein the auxiliary buildings of the a series and the b series, which are arranged on either side of the reactor building having the outer wall capable of protecting against the external flying object, are set at a height that prevents the external flying object from colliding with the auxiliary buildings, based on a flight route that takes into account the maximum descent angle of the expected external flying object.

10. A nuclear power plant comprising a reactor building in which a nuclear reactor and equipment for maintaining the safety functions of the reactor are installed, surrounding buildings arranged around the reactor building, and two or more auxiliary buildings in which at least equipment that requires external supply or external discharge is installed among the equipment for maintaining the safety functions of the reactor, wherein the reactor building and the surrounding buildings have outer walls that can protect against external flying objects, and the auxiliary buildings are made up of a series A, B, and C, each consisting of a building that houses safety equipment that has a communication point with the outside and a building that houses equipment related to the safety equipment that has a communication point with the outside, a reactor building having an outer wall capable of protecting against external flying objects; and surrounding buildings, which are arranged in a straight line with the reactor building at the center, and the auxiliary building has an auxiliary building with an outer wall capable of protecting against external flying objects and surrounding buildings, and the auxiliary building has an auxiliary building with an outer wall capable of protecting against external flying objects and surrounding buildings, which are arranged in a straight line with the reactor building in between ...

11. A nuclear power plant according to claim 10, wherein the a-series and the b-series of the auxiliary building are arranged in a straight line with the reactor building in between, and the c-series of the auxiliary building is arranged on a side of the outer wall of the reactor building that is different from the side of the outer wall of the reactor building on which the a-series and the b-series of the auxiliary building are arranged.

12. A nuclear power plant according to claim 10, wherein the a-series and the b-series of the auxiliary building are arranged at different positions (offset positions) relative to the outer wall of the reactor building, with the reactor building in between, and the c-series of the auxiliary building is arranged on a side of the outer wall of the reactor building that is different from the side of the outer wall of the reactor building on which the a-series and the b-series of the auxiliary building are arranged.

13. A nuclear power plant according to claim 10, wherein the surrounding building is a turbine building.

14. A nuclear power plant as claimed in claim 13, wherein the a-series and b-series of the auxiliary building are arranged on either side of the reactor building, which has an outer wall capable of protecting against the external flying object, and the c-series of the auxiliary building is arranged in a direction different from the arrangement direction of the a-series and b-series of the auxiliary building, and a part of the outer wall of the c-series of the auxiliary building is configured to be able to protect against the external flying object.

15. A nuclear power plant according to claim 14, wherein the a-series and the b-series of the auxiliary building are arranged in a straight line with the reactor building in between, and the c-series of the auxiliary building is arranged on a side of the outer wall of the reactor building that is different from the side of the outer wall of the reactor building on which the a-series and the b-series of the auxiliary building are arranged.

16. A nuclear power plant according to claim 14, wherein the a-series and the b-series of the auxiliary building are arranged at different positions (offset positions) relative to the outer wall of the reactor building, with the reactor building in between, and the c-series of the auxiliary building is arranged on a side of the outer wall of the reactor building that is different from the side of the outer wall of the reactor building on which the a-series and the b-series of the auxiliary building are arranged.

17. A nuclear power plant as described in claim 14, wherein the auxiliary buildings of the a series and the b series, which are arranged on either side of the reactor building having the outer wall capable of protecting against the external flying object, are set at a height that prevents the external flying object from colliding with the auxiliary buildings, based on a flight route that takes into account the maximum descent angle of the expected external flying object.

18. A nuclear power plant as claimed in claim 10, wherein the auxiliary buildings of the a-series and the b-series consist of two buildings housing safety equipment having a communicating part with the outside and one building housing equipment related to the safety equipment having a communicating part with the outside; the c-series auxiliary building consists of one building housing equipment related to the safety equipment having a communicating part with the outside; the a-series and b-series of the auxiliary buildings are arranged on either side of the reactor building, which has an outer wall capable of protecting against the external flying object; and the c-series auxiliary building is arranged in a direction different from the arrangement direction of the a-series and b-series of the auxiliary building, and the outer wall of the c-series auxiliary building is configured to be able to protect against the external flying object.

19. A nuclear power plant according to claim 18, wherein the a-series and the b-series of the auxiliary building are arranged in a straight line with the reactor building in between, and the c-series of the auxiliary building is arranged on a side of the outer wall of the reactor building that is different from the side of the outer wall of the reactor building on which the a-series and the b-series of the auxiliary building are arranged.

20. A nuclear power plant according to claim 18, wherein the a-series and the b-series of the auxiliary building are arranged at different positions (offset positions) relative to the outer wall of the reactor building, with the reactor building in between, and the c-series of the auxiliary building is arranged on a side of the outer wall of the reactor building that is different from the side of the outer wall of the reactor building on which the a-series and the b-series of the auxiliary building are arranged.

21. A nuclear power plant as described in claim 18, characterized in that the auxiliary buildings of the a series and the b series, which are arranged on either side of the reactor building having the outer wall capable of protecting against the external flying object, are set at a height that prevents the external flying object from colliding with the auxiliary buildings, based on a flight route that takes into account the expected maximum descent angle of the external flying object.

22. A nuclear power plant according to any one of claims 1 to 21, wherein the outer wall capable of protecting against external flying objects is a concrete wall having a thickness that can prevent penetration of the outer wall when the external flying object hits it.

23. A nuclear power plant as described in claim 22, wherein the outer wall capable of protecting against external flying objects is composed of multiple concrete walls, including the inner wall of the reactor building, in addition to an outer concrete wall having a thickness that can prevent penetration of the outer wall when hit by the external flying object, and has a thickness that prevents peeling off of the back surface of the outer wall.

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