Reactor building

Abstract

To obtain a highly economical reactor building that achieves both improved impact resistance from flying objects such as aircraft and improved earthquake resistance, while minimizing the increase in the amount of construction materials. [Solution] In order to solve the above problems, the reactor building of the present invention is characterized by comprising a plurality of inner walls 21 that extend in the height direction of the reactor building 100 along the inner surface of the outer wall 1 of the reactor building 100, and that extend in the horizontal direction of the reactor building 100 perpendicular to the outer wall 1, are separated from the reactor containment vessel 15 and are arranged at predetermined intervals, and the inner walls 21 are installed on at least the ground floor of the reactor building 100.

Description

Technical Field

[0001] The present invention relates to a reactor building, and more particularly to a reactor building suitable for a building provided with safety measures against collisions of flying objects such as aircraft.

Background Art

[0002] Generally, a boiling water nuclear power plant houses a reactor pressure vessel containing a reactor, a reactor containment vessel containing the reactor pressure vessel, a spent fuel storage pool for cooling and storing spent fuel assemblies, etc. inside a reactor building, and moreover, it is robustly constructed using reinforced concrete or the like so as to withstand an earthquake which is a natural disaster.

[0003] Furthermore, in recent years, further safety enhancement of the reactor building against collisions of flying objects such as aircraft has been demanded, and particularly, protection against collisions of flying objects such as aircraft on the ground floor of the reactor building has become necessary. Also, taking these measures has led to an increase in the amount of construction materials, which has become a problem as it results in a soaring construction cost.

[0004] For example, in Patent Document 1, in order to improve the seismic resistance and reliability of a reactor facility including a reactor containment vessel, a reactor building, and an annex building during a major earthquake, in a reactor building comprising a reactor building housing a reactor containment vessel inside and an annex building disposed so as to surround the outer periphery of the reactor building, a reactor building is described in which a plurality of intermediate seismic walls extending in a direction intersecting the reactor building are erected between the outer walls of the reactor building and the annex building.

[0005] Furthermore, Patent Document 2 describes a seismic damping structure in which, in order to simplify and lighten the overall structure of the facility while ensuring seismic performance without any problems, the entire outer wall of the reactor building is composed of four megablocks (building module structures), four equipment modules (equipment module structures) are arranged inside them, a reactor containment vessel is provided in the center of the reactor building by cylindrical megablocks, and the megablocks are integrally provided with rib-shaped seismic walls that protrude at key points on the inside. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Special Publication No. 6-034063 [Patent Document 2] Japanese Patent Publication No. 2008-144513 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] However, the reactor building described in Patent Document 1 above has intermediate seismic walls to distribute the seismic load evenly and improve seismic resistance, but the location where these intermediate seismic walls are installed is limited to the lower floors where the annex buildings are located, and therefore does not contribute to further improving the impact resistance of the upper floors of the reactor building, especially the important spent fuel pool and reactor containment vessel, against collisions with flying objects such as aircraft.

[0008] Furthermore, although the seismic damping structure described in Patent Document 2 above is intended for nuclear power plants and the like, it is not intended to protect against collisions with flying objects such as aircraft. In the megablock used as a building module structure on the lower floor of the reactor building, rib-shaped seismic walls are provided, but it is not guaranteed that further improvements in impact resistance can be achieved even when considering collisions with flying objects such as aircraft on the spent fuel pool or the top of the reactor containment vessel located on the upper floor of the reactor building.

[0009] The present invention has been made in view of the above-mentioned points, and its objective is to provide a highly economical reactor building that achieves both improved impact resistance from flying objects such as aircraft and improved seismic resistance, while minimizing the increase in the amount of construction materials. [Means for solving the problem]

[0010] To achieve the above objective, the reactor building of the present invention houses a reactor containment vessel containing a reactor pressure vessel, and comprises at least a roof, outer walls, a top slab, floors and a foundation mat, and consists of above-ground floors above the ground surface and underground floors below the ground surface, wherein the outer walls of the reactor building extend in the height direction of the reactor building along the inner surface of the outer walls, and also extend in the horizontal direction of the reactor building perpendicular to the outer walls, are separated from the reactor containment vessel and arranged at predetermined intervals, and the inner walls are installed at least on the above-ground floor of the reactor building. [Effects of the Invention]

[0011] According to the present invention, it is possible to obtain a highly economical reactor building that achieves both improved impact resistance from flying objects such as aircraft and improved seismic resistance, while minimizing the increase in the amount of construction materials. [Brief explanation of the drawing]

[0012] [Figure 1] This is a cross-sectional view of a reactor building showing Embodiment 1 of the present invention. [Figure 2] This is a cross-sectional view along line AA in Figure 1. [Figure 3(a)] To explain Embodiment 1 of the reactor building of the present invention, this is an enlarged view corresponding to part C in Figure 2, which shows a modified example of the outer wall in the event of an impact by a flying object when there is no inner wall. [Figure 3(b)] To illustrate Embodiment 1 of the reactor building of the present invention, Figure 2 shows an enlarged view of section C, which illustrates a modified example of the outer wall during a flying object impact when there is an inner wall and the inner wall is included in the area where the flying object impacts. [Figure 3(c)]In explaining Example 1 of the reactor building of the present invention, it is an enlarged view of part C of FIG. 2 showing a deformation example of the outer wall at the time of projectile collision when there is an inner wall and the inner wall is not included in the projectile collision area. [Figure 4(a)] In explaining Example 1 of the reactor building of the present invention, it is an enlarged view of part D of FIG. 2 showing the effective span of the floor when there is no inner wall. [Figure 4(b)] In explaining Example 1 of the reactor building of the present invention, it is an enlarged view of part D of FIG. 2 showing the effective span of the floor considering the stiffening effect of the inner wall on the floor. [Figure 5] It is a cross-sectional view corresponding to FIG. 1 showing Example 2 of the reactor building of the present invention. [Figure 6] It is a cross-sectional view corresponding to FIG. 1 showing Example 3 of the reactor building of the present invention. [Figure 7] It is a cross-sectional view corresponding to FIG. 1 showing Example 4 of the reactor building of the present invention. [Figure 8] It is a cross-sectional view corresponding to FIG. 1 showing Example 5 of the reactor building of the present invention. [Figure 9] It is a cross-sectional view corresponding to FIG. 1 showing Example 6 of the reactor building of the present invention. [Figure 10] It is a cross-sectional view corresponding to FIG. 9 showing a modified example of Example 6 of the reactor building of the present invention. [Figure 11] It is a cross-sectional view corresponding to FIG. 1 showing Example 7 of the reactor building of the present invention. [Figure 12] It is a cross-sectional view corresponding to FIG. 2 showing Example 8 of the reactor building of the present invention. [[ID=3*]] [Figure 13] It is a cross-sectional view corresponding to FIG. 2 showing Example 9 of the reactor building of the present invention. [Figure 14] It is a cross-sectional view taken along line B-B of FIG. 13. [Figure 15] It is a cross-sectional view corresponding to FIG. 14 showing a modified example of Example 9 of the reactor building of the present invention. [Figure 16] It is a cross-sectional view corresponding to FIG. 14 showing Example 10 of the reactor building of the present invention. [Figure 17] It is a cross-sectional view corresponding to FIG. 2 showing Example 11 of the reactor building of the present invention. [[ID=*6]] [Figure 18] This is a cross-sectional view corresponding to Figure 2, showing Example 12 of the reactor building of the present invention. [Modes for carrying out the invention]

[0013] The reactor building of the present invention will be described below based on the illustrated embodiments. In each figure, the same reference numerals are used for the same components. [Examples]

[0014] Figures 1 and 2 show Example 1 of the reactor building 100 of the present invention.

[0015] As shown in Figures 1 and 2, the reactor building 100 of this embodiment has a rectangular cross-section, and its outer structure is composed of an outer wall 1, a roof 2 that covers the upper part of the outer wall 1, and a foundation mat 4 that supports the outer wall 1. It consists of above-ground floors (three above-ground floors in this embodiment) above the ground surface 41 and underground floors (three underground floors in this embodiment) below the ground surface 41.

[0016] Inside the reactor building 100 described above, there are floors 3a, 3b, 3c, 3d, and 3e on each floor, including the top slab 5 such as the operating floor, as well as a spent fuel pool 6 located on the top floor above ground where spent fuel assemblies are stored in cooling water, and a reactor containment vessel 15 that houses the reactor pressure vessel 16. The reactor containment vessel 15 and the outer wall 1 are connected by the floors 3a, 3b, 3c, 3d, and 3e on each floor.

[0017] Furthermore, the reactor containment vessel 15 is equipped with the aforementioned reactor pressure vessel 16 and a reactor pressure vessel pedestal 17 that supports the reactor pressure vessel 16. In addition, floor-mounted equipment (e.g., tanks, pumps, etc.) 31 are placed on the floors 3a, 3b, 3c, 3d, 3e of each level and on the foundation mat 4 (in this embodiment, an example is shown in which floor-mounted equipment 31 is placed on the foundation mat 4).

[0018] In this embodiment, the outer wall 1 of the reactor building 100 is provided with a plurality of inner walls 21 (inner walls 21a, 21b, 21c, 21d, 21e, 21f) that extend in the height direction of the reactor building 100 along the inner surface of the outer wall 1, and also extend in the horizontal direction of the reactor building 100 perpendicular to the outer wall 1, are separated from the reactor containment vessel 15 and are arranged at predetermined intervals, and these inner walls 21a, 21b, 21c, 21d, 21e, 21f are characterized in that their lengths in the height direction differ for each floor of the reactor building 100.

[0019] Furthermore, in this embodiment, the reactor building 100 has a spent fuel pool 6 on the top floor of the ground floor (the third floor in this embodiment) where spent fuel assemblies are stored in cooling water. The inner wall 21a located on the third floor of the ground floor is the longest in the height direction of the reactor building 100 on the third floor of the ground floor where the spent fuel pool 6 is located (it is the longest in the height direction compared to the other inner walls 21b, 21c, 21d, 21e, and 21f).

[0020] To explain in more detail, the reactor building 100 in this embodiment is a building with three above-ground floors and three underground floors. A spent fuel pool 6 is installed on the third above-ground floor. Of the inner walls 21a, 21b, and 21c installed on the above-ground floors, the inner wall 21a installed on the third above-ground floor has the longest height in the reactor building 100, and the inner wall 21b installed on the second above-ground floor has the shortest height in the reactor building 100.

[0021] Furthermore, among the interior walls 21d, 21e, and 21f installed in the basement, the interior wall 21d installed on the first basement floor has the shortest height in the reactor building 100, the interior walls 21e and 21f installed on the second and third basement floors have a greater height in the reactor building 100 than the interior wall 21d installed on the first basement floor, and the interior walls 21e and 21f installed on the second and third basement floors have approximately the same height in the reactor building 100.

[0022] According to this embodiment, the reactor building 100 has inner walls 21 that are perpendicular to the outer wall 1 and separated from the reactor containment vessel 15, arranged at predetermined intervals between the outer wall 1 and the reactor containment vessel 15, from the basement floor to the ground floor (the height above the spent fuel pool 6, which is to be protected from collisions by flying objects such as aircraft). As a result, the inner walls 21a, 21b, 21c, 21d, 21e, and 21f provide a stiffening effect to the outer wall 1 at the locations where these inner walls 21a, 21b, 21c, 21d, 21e, and 21f are installed, making the outer wall 1 more rigid than the parts of the outer wall 1 where the inner walls 21a, 21b, 21c, 21d, 21e, and 21f are not installed.

[0023] Moreover, according to this embodiment, it is possible to inexpensively improve impact resistance from flying objects such as aircraft from the outside and reduce vibration input to equipment from the floors 3a, 3b, 3c, 3d, and 3e on each floor (improving the seismic resistance of the equipment). Furthermore, it is expected to have the effect of improving the soil pressure resistance of the reactor building 100 when it is deeply embedded in the ground, as well as the routing of long mechanical and electrical components (e.g., pipes and air conditioning ducts, etc.) and the storage and placement space for equipment placed on the floor (e.g., tanks, pumps, etc.).

[0024] Therefore, according to this embodiment, it is possible to obtain a highly economical reactor building 100 that achieves both improved impact resistance to flying objects such as aircraft and improved seismic resistance, while minimizing the increase in the amount of construction materials.

[0025] Furthermore, the top slab 5, including the exterior wall 1, interior walls 21a, 21b, 21c, 21d, 21e, 21f, floors 3a, 3b, 3c, 3d, 3e, and the operating floor, is constructed of reinforced concrete or steel plate concrete.

[0026] Figures 3(a), 3(b), and 3(c) show the deformation of the outer wall 1 during a collision with an incoming object such as an aircraft when there is no inner wall 21 in the reactor building 100 of the present invention, according to Example 1, and the width L of the collision area of ​​an incoming object such as an aircraft when there is an inner wall 21. F This diagram illustrates the deformation of the outer wall 1 during a collision with an incoming object such as an aircraft, with or without the inner wall 21.

[0027] Figure 3(a) is an enlarged view corresponding to section C in Figure 2, showing a modified example of the outer wall 1 during an impact by flying debris when there is no inner wall 21, in order to explain Embodiment 1 of the reactor building 100 of the present invention; Figure 3(b) is an enlarged view of section C in Figure 2, showing a modified example of the outer wall 1 during an impact by flying debris when there is an inner wall 21 and the inner wall 21 is included in the impact area of ​​the flying debris, in order to explain Embodiment 1 of the reactor building 100 of the present invention; and Figure 3(c) is an enlarged view of section C in Figure 2, showing a modified example of the outer wall 1 during an impact by flying debris when there is an inner wall 21 and the inner wall 21 is not included in the impact area of ​​the flying debris, in order to explain Embodiment 1 of the reactor building 100 of the present invention.

[0028] In Figures 3(a), 3(b), and 3(c), the width L of the collision area for flying objects such as aircraft is shown on the ground floor where collisions with flying objects such as aircraft are anticipated. F When the inner wall 21 is included (as in Figure 3(b)), it can be seen that the overall deformation 111 of the outer wall 1 is reduced due to the stiffening effect that increases the rigidity of the outer wall 1.

[0029] Also, the width L of the collision area for flying objects such as aircraft. F Even if the inner wall 21 is not included (as in Figure 3(c), where an incoming object such as an aircraft collides between the inner walls 21), the inner wall 21 acts as a support, and compared to the case without the inner wall 21 (as in Figure 3(a)), the effective span length L of the outer wall 1 is determined by the spacing of the support parts, resulting in a shorter span length. This has the effect of suppressing the overall deformation 111 of the outer wall 1 and improving impact resistance.

[0030] Therefore, the maximum deformation of the outer wall 1 during a collision with an aircraft or other flying object follows the relationship shown in equation (1) below.

[0031]

number

[0032] Here, δ N_max This is the maximum deformation amount of the outer wall 1 during an impact by a flying object when the inner wall 21 is absent, δ WA_maxThis is the maximum deformation amount of the outer wall 1 during an impact by an object, when there is an inner wall 21 and the inner wall 21 is included in the impact area of ​​the object, δ WN_max This is the maximum deformation amount of the outer wall 1 during an impact by an object, when there is an inner wall 21 and the inner wall 21 is not included in the impact area of ​​the object.

[0033] For example, if the size of an incoming object such as an aircraft is known, the predetermined spacing of the inner wall 21 can be set so that the effective span length L is smaller than the size of the incoming object, thereby ensuring equivalent impact resistance regardless of the direction from which the aircraft or other object collides.

[0034] On the other hand, in the underground levels, when the reactor building 100 is embedded in the ground, the earth pressure increases in proportion to the depth, but the stiffening effect that the inner wall 21 provides to the outer wall 1 can be expected to improve resistance to this earth pressure. Furthermore, from the perspective of improving the seismic resistance of the equipment installed inside the reactor building 100, the inner wall 21 can suppress out-of-plane deformation of the floors 3a, 3b, 3c, 3d, and 3e on each floor (in Figure 1, deformation of the floors 3a, 3b, 3c, 3d, and 3e in the height direction of the reactor building 100), thereby reducing vibration input to the equipment.

[0035] Figures 4(a) and 4(b) illustrate the effective spans of floors 3a, 3b, 3c, 3d, and 3e in Embodiment 1 of the reactor building 100 of the present invention, assuming that a stiffening effect that suppresses deformation is obtained even along the extension of the inner wall 21. Figure 4(a) is an enlarged view of section D in Figure 2, showing the effective spans of floors 3a, 3b, 3c, 3d, and 3e when there is no inner wall 21, in order to explain Embodiment 1 of the reactor building 100 of the present invention. Figure 4(b) is an enlarged view of section D in Figure 2, showing the effective spans of floors 3a, 3b, 3c, 3d, and 3e when the stiffening effect of the inner wall 21 on floors 3a, 3b, 3c, 3d, and 3e is taken into consideration, in order to explain Embodiment 1 of the reactor building 100 of the present invention.

[0036] In contrast to the case where there is no inner wall 21 as shown in Figure 4(a), when there is an inner wall 21 as shown in Figure 4(b), the region enclosed by the outer wall 1 and the inner wall 21 perpendicular to this outer wall 1 (in Figure 4(b), the region enclosed by the lower part of the outer wall 1 and the two inner walls 21) is determined as the effective span 121 of the floors 3a, 3b, 3c, 3d, and 3e.

[0037] As a result, the effective span area 121 of the floors 3a, 3b, 3c, 3d, and 3e becomes smaller than when there is no inner wall 21, and the effect of increasing the rigidity of the floors 3a, 3b, 3c, 3d, and 3e is obtained. By increasing the rigidity of the floors 3a, 3b, 3c, 3d, and 3e and reducing the effective span area 121, the region in which the vibration response is amplified is narrowed, and the vibration input to equipment placed on the floor (e.g., tanks, pumps, etc.) during an earthquake can be reduced.

[0038] For example, by placing equipment on floors 3a, 3b, 3c, 3d, and 3e in areas where vibration response is reduced, such as near the interior wall 21 or along the extension of the interior wall 21, the seismic resistance of the equipment can be improved.

[0039] In this way, by utilizing a partial inner wall 21 that is perpendicular to the outer wall 1 and separated from the reactor containment vessel 15, the amount of reinforced concrete and steel plate concrete that make up the inner wall 21 can be reduced compared to using an unseparated inner wall that is connected to both the outer wall 1 and the reactor containment vessel 15, making it more economical.

[0040] In addition to the above, the space created by partially modifying the interior wall 21 can be effectively utilized as space necessary for piping routing, equipment placement, and equipment delivery and installation.

[0041] Furthermore, the stiffening effect of the inner wall 21 on the outer wall 1 and floors 3a, 3b, 3c, 3d, and 3e makes it possible to improve both the impact resistance of the reactor building 100 and the seismic resistance of the equipment. In addition, by improving impact resistance with the inner wall 21, if the thickness of the outer wall 1 on the ground floor can be reduced, it is possible to avoid a top-heavy structure (a structure in which many elements are concentrated at the top) that is required for protection against flying objects such as aircraft, which also leads to an improvement in the seismic resistance of the reactor building 100.

[0042] Furthermore, the structure of the reactor building 100 may have a cylindrical cross-section. In this case, radial inner walls 21 perpendicular to the outer wall 1 should be arranged, that is, the inner walls 21 should be arranged radially toward the center of the reactor building 100. Even when the structure of the reactor building 100 has a cylindrical cross-section, the stiffening effect of the inner walls 21 on the outer wall 1 can be obtained, similar to the structure of the reactor building 100 with a rectangular cross-section as shown in Figure 1, thereby achieving high rigidity of the floors 3a, 3b, 3c, 3d, and 3e. [Examples]

[0043] Figure 5 shows Example 2 of the reactor building 100 of the present invention.

[0044] Embodiment 2, shown in Figure 5, is characterized by having an inner wall 21g above the top slab 5, such as the operating floor, which is installed above the spent fuel pool 6, so that it can also provide protection when flying objects such as aircraft fly in at an oblique angle from above and collide with it.

[0045] The inner wall 21g, located above the top slab 5, is configured such that its height in the reactor building 100 is slightly shorter than the height in the reactor building 100 of the inner wall 21a located on the third floor above ground, but longer than the height in the reactor building 100 of the inner walls 21b and 21c located on the second and first floors above ground. The other configurations are the same as those of the embodiment 1 described above.

[0046] Incidentally, if the roof 2 of the reactor building 100 has a curved shape such as an arch or dome, or a polygonal dish shape, then the inner wall 21 should be installed up to the connection point between the upper part of the reactor building 100 and the roof 2. Also, if sufficient seismic resistance can be ensured for the basement floor of the reactor building 100, then, as shown in Figure 5, by focusing on protection against collisions with flying objects such as aircraft and installing the inner wall 21 only on the ground floor, the increase in the amount of concrete in the reactor building 100 can be suppressed.

[0047] By configuring this embodiment, the same effects as in Embodiment 1 can be obtained. The structure of the reactor building 100 may also have a cylindrical cross-section, as described in Embodiment 1. [Examples]

[0048] Figure 6 shows Example 3 of the reactor building 100 of the present invention.

[0049] Embodiment 3, shown in Figure 6, is characterized in that the inner walls 21a, 21b, and 21c for protecting against flying objects such as aircraft on the ground floor of the reactor building 100, and the inner walls 21d, 21e, and 21f for improving seismic resistance in the basement floors, are separated in the height direction of the reactor building 100. That is, in the basement floors of the reactor building 100, the inner wall 21e is not placed on the middle floor (basement 2nd floor), thereby separating the inner walls 21 in the height direction of the reactor building 100.

[0050] To explain in more detail, the reactor building 100 in this embodiment is a building with three above-ground floors and three underground floors. A spent fuel pool 6 is installed on the third above-ground floor. Of the interior walls 21a, 21b, and 21c installed on the above-ground floors, the interior wall 21a located on the third above-ground floor has the longest height in the reactor building 100, and the interior wall 21b located on the second above-ground floor has the shortest height in the reactor building 100. Of the interior walls 21d, 21e, and 21f installed on the underground floors, the interior wall 21d located on the first underground floor has a shorter height in the reactor building 100 than the interior wall 21f located on the third underground floor, and there is no interior wall 21e on the second underground floor. The other configurations are the same as those of Embodiment 1 described above.

[0051] By configuring the reactor building in this embodiment, it is possible to obtain the same effects as in Embodiment 1. Furthermore, since there are floors where the inner wall 21 is not present, it is possible to secure the routes necessary for personnel access and equipment transport in the reactor building 100. The structure of the reactor building 100 may have a cylindrical cross-section as described in Embodiment 1. [Examples]

[0052] Figure 7 shows Example 4 of the reactor building 100 of the present invention.

[0053] Embodiment 4, shown in Figure 7, is characterized by varying the horizontal length of the inner walls 21a, 21b, 21c, 21d, 21e, and 21f perpendicular to the outer wall 1 in the height direction of the reactor building 100, shortening the horizontal length of the inner walls 21a, 21b, and 21c on each floor above ground, and making the horizontal length of the inner walls 21d, 21e, and 21f on each floor below ground longer than the horizontal length of the inner walls 21a, 21b, and 21c on each floor above ground.

[0054] To explain in more detail, the reactor building 100 in this embodiment is a building with three above-ground floors and three underground floors. A spent fuel pool 6 is installed on the third above-ground floor. Of the inner walls 21a, 21b, and 21c installed on the above-ground floors, the inner wall 21a installed on the third above-ground floor has the longest height in the reactor building 100, and the inner wall 21b installed on the second above-ground floor has the shortest height in the reactor building 100.

[0055] Furthermore, among the interior walls 21d, 21e, and 21f installed in the basement, the interior wall 21d installed on the first basement floor has the shortest height in the reactor building 100, the interior walls 21e and 21f installed on the second and third basement floors have a greater height in the reactor building 100 than the interior wall 21d installed on the first basement floor, and the interior walls 21e and 21f installed on the second and third basement floors have approximately the same height in the reactor building 100.

[0056] Furthermore, among the interior walls 21a, 21b, and 21c installed on the ground floor, the horizontal lengths of the reactor building 100 for interior walls 21a and 21b installed on the second and third floors of the ground floor are approximately the same, while the horizontal length of the reactor building 100 for interior wall 21c installed on the first floor of the ground floor is longer than the horizontal length of the reactor building 100 for interior walls 21a and 21b installed on the second and third floors of the ground floor.

[0057] Furthermore, among the inner walls 21d, 21e, and 21f installed in the basement, the inner wall 21d installed on the first basement floor has the shortest horizontal length to the reactor building 100, the inner walls 21e and 21f installed on the second and third basement floors have a horizontal length to the reactor building 100 that is longer than the inner wall 21d installed on the first basement floor, and the inner walls 21e and 21f installed on the second and third basement floors have approximately the same horizontal length to the reactor building 100. Other configurations are the same as those of Embodiment 1 described above.

[0058] By configuring this embodiment, it is possible to obtain the same effects as in Embodiment 1, and at the same time, the superstructure of the above-ground floor of the reactor building 100 will not become top-heavy. Furthermore, since the horizontal lengths of the inner walls 21d, 21e, and 21f of the underground floor are longer than the horizontal lengths of the inner walls 21a, 21b, and 21c of the above-ground floor, it is possible to strengthen resistance to earth pressure, which has a greater impact at deeper levels in the underground floor. The structure of the reactor building 100 may also have a cylindrical cross-section as described in Embodiment 1. [Examples]

[0059] Figure 8 shows Example 5 of the reactor building 100 of the present invention.

[0060] Embodiment 5, shown in Figure 8, is characterized in that the horizontal length of the interior walls 21a, 21b, 21c, 21d, 21e, and 21f perpendicular to the outer wall 1 on the ground floor is varied in the height direction of the reactor building 100, and the horizontal length of the interior walls 21a, 21b, and 21c on the ground floor is made longer than the horizontal length of the interior walls 21d, 21e, and 21f on the basement floor.

[0061] To explain in more detail, the reactor building 100 in this embodiment is a building with three above-ground floors and three underground floors. A spent fuel pool 6 is installed on the third above-ground floor. Of the inner walls 21a, 21b, and 21c installed on the above-ground floors, the inner wall 21a installed on the third above-ground floor has the longest height in the reactor building 100, and the inner wall 21b installed on the second above-ground floor has the shortest height in the reactor building 100.

[0062] Furthermore, among the interior walls 21a, 21b, and 21c installed on the ground floor, the horizontal lengths of the reactor building 100 for interior walls 21c and 21b installed on the first and second floors of the ground floor are approximately the same, while the horizontal length of the reactor building 100 for interior wall 21a installed on the third floor of the ground floor is longer than the horizontal length of the reactor building 100 for interior walls 21c and 21b installed on the first and second floors of the ground floor.

[0063] Furthermore, the interior walls 21d, 21e, and 21f installed in the basement are configured to have approximately the same horizontal length as the reactor building 100 on the first to third floors of the basement. The other configurations are the same as those of Embodiment 1 described above.

[0064] By configuring this embodiment, it is possible to obtain the same effects as in Embodiment 1. In particular, by maximizing the height and horizontal length of the inner wall 21a of the reactor building 100 located in the spent fuel pool 6, which is a critical object to be protected, the protection of this important structure against collisions with flying objects such as aircraft is further strengthened. The structure of the reactor building 100 may have a cylindrical cross-section as described in Embodiment 1. [Examples]

[0065] Figure 9 shows Example 6 of the reactor building 100 of the present invention.

[0066] In the embodiment 6 shown in Figure 9, among the interior walls 21a, 21b, and 21c installed on the ground floor, the interior wall 21a installed on the 3rd floor of the ground floor has the longest height of the reactor building 100, and the interior wall 21b installed on the 2nd floor of the ground floor has the shortest height of the reactor building 100. Among the interior walls 21d, 21e, and 21f installed in the basement, the interior wall 21d installed on the 1st basement floor has the shortest height of the reactor building 100, the interior walls 21e and 21fa installed on the 2nd and 3rd basement floors have a greater height of the reactor building 100 than the interior wall 21c installed on the 1st basement floor, and the interior walls 21e and 21fa installed on the 2nd and 3rd basement floors have approximately the same height of the reactor building 100.

[0067] Furthermore, the reactor building 100 in this embodiment is characterized in that the interior walls 21a, 21b, and 21c installed on the ground floor are configured so that the horizontal length of the reactor building 100 increases sequentially from the first floor to the third floor on the ground floor, and the interior walls 21d, 21e, and 21f installed on the basement floor are configured so that the horizontal length of the reactor building 100 increases sequentially from the first floor to the third floor on the basement floor.

[0068] Specifically, the horizontal and vertical lengths of the reactor building 100 on the above-ground and underground floors are varied for the inner walls 21a, 21b, 21c, 21d, 21e, and 21f perpendicular to the outer wall 1. Compared to the vicinity of the ground surface 41, the horizontal and vertical lengths of the inner walls 21a and 21f on the highest and lowest floors are made longer, with the horizontal length of the inner walls 21a and 21f on the highest and lowest floors being the longest, and the vertical and horizontal lengths of the reactor building 100 on the inner wall 21a located in the spent fuel pool 6 being the longest. The other configurations are the same as those of the embodiment 1 described above.

[0069] By configuring this embodiment, it is possible to obtain the same effects as in Embodiment 1. Furthermore, by making the length of the inner wall 21a located in the spent fuel pool 6 the longest in both the vertical and horizontal directions of the reactor building 100, the protection of the spent fuel pool 6, which is an important object to protect, is thoroughly ensured. In addition, by making the length of the inner walls 21d, 21e, and 21f located in the basement floors progressively longer in the horizontal direction of the reactor building 100 as one moves from the first to the third basement floor, it is possible to strengthen the earth pressure resistance and seismic resistance of the basement floors.

[0070] Furthermore, Figure 10 shows a modified example of Embodiment 6 of the reactor building 100 of the present invention shown in Figure 9.

[0071] A modified example of Embodiment 6 shown in Figure 10 involves varying the horizontal and vertical lengths of the inner walls 21a, 21b, 21c, 21d, 21e, and 21f of the reactor building 100, which are perpendicular to the outer wall 1. Compared to the vicinity of the ground surface 41, the horizontal and vertical lengths of the inner walls 21a and 21f of the reactor building 100 on the highest and lowest floors are made longer. The inner wall 21a located in the spent fuel pool 6 on the ground floor and the inner walls 21d, 21e, and 21f on each of the lower floors are made into a trapezoid shape that changes continuously in the height direction of the reactor building 100, with the side facing the ground surface 41 being shorter and the side opposite to the ground surface 41 being longer. (Note that the trapezoidal inner wall 21 shown in Figure 10 may be an inverse trapezoid shape to that shown in Figure 10.)

[0072] The same effects as in Example 6 can be obtained even with the modified reactor building 100 shown in Figure 10. The structure of the reactor building 100 may also have a cylindrical cross-section, as described in Example 1. [Examples]

[0073] Figure 11 shows Example 7 of the reactor building 100 of the present invention.

[0074] The embodiment 7 shown in Figure 11 is characterized in that, in the reactor building 100 of the present invention shown in embodiment 1, openings 24 necessary for personnel access and equipment loading are provided in the inner walls 21a, 21c, 21d, and 21e of predetermined floors.

[0075] In other words, the height of the reactor building 100 in this embodiment is the same as in Embodiment 1, but the interior walls 21a, 21b, 21c, 21d, 21e, and 21f installed on the ground floor and basement floor have approximately the same horizontal length as the reactor building 100, and openings 24 are formed in the interior walls 21c and 21a installed on the 1st and 3rd floors of the ground floor, and in the interior walls 21d and 21e installed on the 1st and 2nd floors of the basement floor.

[0076] Specifically, in this embodiment, openings 24 are provided in the interior walls 21a and 21c of the top floor and bottom floor of the 3rd above-ground floor of the reactor building 100, and in the interior walls 21d and 21e of the 1st and 2nd basement floors of the 3rd basement floor.

[0077] Furthermore, each of the inner walls 21a, 21b, 21c, 21d, 21e, and 21f has a different length in the height direction of the reactor building 100. On the ground floor, the inner wall 21a on the top floor, located in the spent fuel pool 6, has the longest length in the height direction, the inner wall 21c on the first floor has the second longest length, and the inner wall 21b on the second floor has the shortest length in the height direction. Moreover, no opening 24 is formed in the inner wall 21b on the second floor.

[0078] On the other hand, in the basement levels, the inner wall 21d of the first basement level, which faces the ground surface 41, has the shortest height, while the inner walls 21e and 21f of the second and third basement levels have the same height, and are longer in height than the inner wall 21d of the first basement level. Furthermore, no opening 24 is formed in the inner wall 21f of the third basement level. The horizontal lengths of the inner walls 21a, 21b, 21c, 21d, 21e, and 21f are all the same. The other configurations are the same as those of the first embodiment described above.

[0079] By configuring the structure in this embodiment, it is possible to obtain the same effects as in Embodiment 1, and at the same time, to provide an opening 24 necessary for personnel access and equipment loading, while also providing a stiffening effect on the floor and exterior wall 1.

[0080] Furthermore, if an opening 24 as described above is formed, it is desirable to arrange the inner wall 21 so as to span multiple floors rather than separating it in the height direction of the reactor building 100, in order to prevent a decrease in the stiffening effect due to the formation of the opening 24. In other words, a structure in which there are no floors without an inner wall 21, such as in Embodiment 3 shown in Figure 6, is desirable. Note that the structure of the reactor building 100 may have a cylindrical cross-section as described in Embodiment 1. [Examples]

[0081] Figure 12 shows an example 8 of the reactor building 100 of the present invention.

[0082] Embodiment 8, shown in Figure 12, is characterized in that, in the reactor building 100 of the present invention shown in Embodiment 1, assuming that the reactor building 100 is rectangular in shape, in addition to the inner wall 21 perpendicular to the outer wall 1, diagonal members 25 are provided at the corners of the outer wall 1 of the rectangular reactor building 100, and a second inner wall 26, which is separated from the reactor containment vessel 15, is arranged perpendicular to these diagonal members 25. The other configurations are the same as those of Embodiment 1 described above.

[0083] By adopting this configuration in this embodiment, it is possible to obtain the same effects as in Embodiment 1. Furthermore, by dividing the effective span as evenly as possible to create a symmetrical structure, the evaluation of the seismic design of the equipment is simplified. In addition, a radial stiffening effect is obtained toward the reactor containment vessel 15, allowing for the division into fine effective spans with fewer inner walls 21. Moreover, the effects of torsional behavior caused by the asymmetry (eccentricity) of the reactor building 100 are reduced, and the structure can be made more balanced, closer to the cylindrical shape of the reactor building. [Examples]

[0084] Figures 13 and 14 show an embodiment 9 of the reactor building 100 of the present invention.

[0085] Embodiment 9, shown in Figures 13 and 14, is characterized in that a foundation section 23 wider than the interior wall 21 is provided between the lower part of the interior wall 21 shown in Embodiment 1 and the floor 3c of the first floor above ground and the floor 3d of the first floor of the basement, between the floor 3d of the first floor of the basement and the floor 3e of the second floor of the basement, and between the floor 3e of the second floor of the basement and the foundation mat 4, and the interior wall 21 is connected to the floor 3d of the first floor of the basement, the floor 3e of the second floor of the basement and the foundation mat 4 via this foundation section 23. The other configurations are the same as those of Embodiment 1 described above.

[0086] By using this configuration in this embodiment, it is possible to obtain the same effects as in Embodiment 1, and also to reduce the effective span and increase the stiffening effect obtained on the floor.

[0087] Furthermore, Figure 15 is a modified example 9 of the above-described embodiment, and corresponds to Figure 14.

[0088] As shown in Figure 15, the stiffening effect can be further enhanced by providing a foundation 23 like the one in Figure 14 on both the upper and lower surfaces of the first floor 3d and the second floor 3e of the basement (sandwiching the floors 3d and 3e) to support the interior wall 21. [Examples]

[0089] Figure 16 shows Example 10 of the reactor building 100 of the present invention.

[0090] Embodiment 10, shown in Figure 16, is characterized in that the thickness of the inner wall 21 shown in Embodiment 1 is varied in the height direction of the reactor building 100, and the thickness t1 on the floor 3d, 3e and foundation mat 4 side is thicker than the thickness t2 on the opposite side of the floor 3d, 3e and foundation mat 4, that is, the lower part of the inner wall 21 in the height direction of the reactor building 100 is thicker and the upper part is thinner (however, the inner wall 21 in this embodiment may be a trapezoid with the thickness reversed from the shape shown in Figure 16). The other configurations are the same as those of Embodiment 1 described above.

[0091] Even with this configuration of the embodiment, the effect is the same as in the 9th embodiment. [Examples]

[0092] Figure 17 shows Example 11 of the reactor building 100 of the present invention.

[0093] Embodiment 11, shown in Figure 17, is characterized by having an auxiliary wall 22 connected to the tip of the inner wall 21 shown in Embodiment 1 at a predetermined angle θ1 (the inner wall 21 and the auxiliary wall 22 are preferably a single unit, but are not necessarily required to be a single unit). The other configurations are the same as those of Embodiment 1 described above.

[0094] By adopting this configuration in this embodiment, it is possible to obtain the same effects as in Embodiment 1, and in addition, the presence of the auxiliary wall 22 provides the effect of increasing the stiffening effect.

[0095] Furthermore, it is desirable to adjust the angle θ1 of the auxiliary wall 22 so that it faces the center of the span where the maximum deformation of the span requiring stiffening effect is expected. Also, as in this embodiment, it is most effective to provide the auxiliary wall 22 at the tip of the inner wall 21, but it is not always necessary to provide the auxiliary wall 22 at the tip of the inner wall 21. [Examples]

[0096] Figure 18 shows Example 12 of the reactor building 100 of the present invention.

[0097] Embodiment 12, shown in Figure 18, is characterized by having a separate inner wall 27 that is connected to the reactor containment vessel 15 and separated from the outer wall 1, and is installed radially in the circumferential direction of the reactor containment vessel 15 at a predetermined angle θ2 interval, so as to divide the inner walls 21 shown in Embodiment 1 at a predetermined angle θ2. Specifically, it is characterized by having an inner wall 27 that is separated from the outer wall 1, connected to the reactor containment vessel 15 and arranged radially toward the four corners of the reactor building 100, dividing the inner wall 21 at an angle θ2 between the dashed lines. The other configurations are the same as those of Embodiment 1 described above.

[0098] By configuring this embodiment, it is possible to obtain the same effects as in Embodiment 1, and by providing the reactor containment vessel 15 with radial inner walls 27, the stiffening effect of the floors 3a, 3b, 3c, 3d, and 3e can be further improved. Furthermore, by changing the angle θ2 described above and arranging the inner walls 27 radially, the floors 3a, 3b, 3c, 3d, and 3e can be adjusted to the desired rigidity.

[0099] It should be noted that the present invention is not limited to the embodiments described above, and various modifications are included. For example, the embodiments described above are described in detail for the purpose of explaining the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Furthermore, it is possible to combine parts of the configuration of one embodiment with the configuration of another embodiment. In addition, it is possible to add, delete, or replace parts of the configuration of each embodiment with other configurations. [Explanation of Symbols]

[0100] 1…Exterior wall, 2…Roof, 3a, 3b, 3c, 3d, 3e…Floor, 4…Foundation mat, 5…Top slab, 6…Spent fuel pool, 15…Reactor containment vessel, 16…Reactor pressure vessel, 17…Reactor pressure vessel pedestal, 21, 21a, 21b, 21c, 21d, 21e, 21f, 21g…Interior wall, 22…Auxiliary wall, 23…Foundation, 24…Opening, 25…Diagonal brace, 26…Second interior wall, 27…Interior wall different from interior wall 21, 31…Floor-mounted equipment, 41…Ground surface, 100…Reactor building, 111…Deformation shape resulting from impact of flying objects, 121…Effective span of the floor considering the stiffening effect of the interior wall on the floor, L…Effective span length of the exterior wall, L F ...The width of the area where the flying object will collide.

Claims

1. A reactor building that houses a reactor containment vessel containing a reactor pressure vessel, and comprises at least a roof, outer walls, top slab, floor and foundation mat, and consists of above-ground floors above ground level and underground floors below ground level, The outer wall of the reactor building extends in the height direction of the reactor building along the inner surface of the outer wall, and also extends in the horizontal direction of the reactor building perpendicular to the outer wall, and comprises a plurality of inner walls that are separated from the reactor containment vessel and arranged at predetermined intervals. The reactor building is characterized in that the interior wall is installed at least on the ground floor of the reactor building.

2. A reactor building according to claim 1, The aforementioned interior wall is characterized in that the length in the height direction differs for each floor of the reactor building.

3. A reactor building according to claim 2, The aforementioned reactor building is a multi-story building above ground, and a spent fuel pool is installed on the top floor of the above ground where spent fuel assemblies are stored in cooling water. The reactor building is characterized in that the inner wall installed on the ground floor has the longest length in the height direction of the reactor building on the top floor where the spent fuel pool is installed.

4. A reactor building according to claim 3, The aforementioned reactor building is a three-story building above ground and three stories underground, and the spent fuel pool is located on the third floor above ground. The interior wall installed on the ground floor is configured such that the third floor of the ground floor has the longest length in the height direction of the reactor building, and the second floor of the ground floor has the shortest length in the height direction of the reactor building. A reactor building characterized in that the inner wall installed in the basement floor has the shortest height in the first floor of the basement, the height in the second and third floors of the basement is longer than the height in the first floor of the basement, and the height in the second and third floors of the basement is approximately the same.

5. A reactor building according to claim 3, A reactor building characterized in that the top slab is installed above the spent fuel pool, and the inner wall is also installed above the top slab.

6. A reactor building according to claim 5, A reactor building characterized in that the aforementioned interior walls are not installed on each of the underground floors.

7. A reactor building according to claim 3, The aforementioned reactor building is a three-story building above ground and three stories underground, and the spent fuel pool is located on the third floor above ground. The interior wall installed on the ground floor is configured such that the third floor of the ground floor has the longest length in the height direction of the reactor building, and the second floor of the ground floor has the shortest length in the height direction of the reactor building. The reactor building is characterized in that the inner wall installed in the basement floor is such that the height of the reactor building on the first floor of the basement floor is shorter than that of the third floor of the basement floor, and the inner wall is not installed on the second floor of the basement floor.

8. A reactor building according to any one of claims 2 to 7, The reactor building is characterized in that the horizontal length of the interior wall is approximately the same for each floor of the reactor building.

9. A reactor building according to claim 4, The interior wall installed on the ground floor is configured such that the horizontal length of the reactor building on the second and third floors of the ground floor is approximately the same, and the horizontal length of the reactor building on the first floor of the ground floor is longer than the horizontal length of the reactor building on the second and third floors of the ground floor. The reactor building is characterized in that the interior wall installed in the basement floor has the shortest horizontal length on the first floor of the basement, the horizontal lengths of the reactor building on the second and third floors of the basement floor are longer than the horizontal length of the reactor building on the first floor of the basement, and the horizontal lengths of the reactor building on the second and third floors of the basement floor are approximately the same.

10. A reactor building according to claim 4, The interior wall installed on the ground floor is configured such that the horizontal length of the reactor building on the first and second floors of the ground floor is approximately the same, and the horizontal length of the reactor building on the third floor of the ground floor is longer than the horizontal length of the reactor building on the first and second floors of the ground floor. The reactor building is characterized in that the interior wall installed in the basement floor has approximately the same horizontal length as the reactor building on the first to third floors of the basement floor.

11. A reactor building according to claim 4, The interior wall installed on the ground floor is configured such that the horizontal length of the reactor building increases sequentially from the first floor to the third floor of the ground floor. The reactor building is characterized in that the interior walls installed in the basement floor are configured such that the horizontal length of the reactor building increases sequentially from the first floor to the third floor of the basement floor.

12. A reactor building according to claim 11, A reactor building characterized in that the interior walls installed on the top floor of the above-ground floor and the underground floor are formed in a trapezoidal shape.

13. A reactor building according to claim 4, The reactor building is characterized in that the interior walls installed on the above-ground floor and the underground floor have substantially the same horizontal length as the reactor building, and an opening is formed in a part of the interior wall.

14. A reactor building according to claim 13, The reactor building is characterized in that the openings are formed in the interior walls installed on the first and third floors of the above-ground floors, and in the interior walls installed on the first and second floors of the underground floors, respectively.

15. A reactor building according to claim 1 or 2, The reactor building is characterized in that it has a rectangular cross-section, diagonal members are provided at the corners of the outer walls of the rectangular reactor building, and a second inner wall, which is separated from the reactor containment vessel, is arranged on the diagonal member so as to be perpendicular to the diagonal member.

16. A reactor building according to claim 1 or 2, A reactor building characterized in that a foundation wider than the inner wall is provided at least between the lower part of the inner wall and the floor of the basement of the reactor building, and the inner wall is installed on the floor of the basement of the reactor building via the foundation.

17. A reactor building according to claim 16, The reactor building is characterized in that the foundation is installed on both the upper and lower surfaces of the basement floor of the reactor building, with the floor in between, and supports the inner wall.

18. A reactor building according to claim 1 or 2, The reactor building is characterized in that the inner wall is formed in a trapezoidal shape such that the thickness of the inner wall varies in the height direction of the reactor building, and at least the thickness on the floor side is greater than the thickness on the opposite side of the floor.

19. A reactor building according to claim 1 or 2, The reactor building is characterized in that the inner wall is provided with an auxiliary wall connected to the inner wall at a predetermined angle.

20. A reactor building according to claim 1, A reactor building characterized by having an inner wall that is connected to the reactor containment vessel and separate from the outer wall and arranged radially, and that divides the spaces between a plurality of inner walls arranged at predetermined intervals at predetermined angles, and is different from the inner walls.

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