Flying object protection facility and nuclear power plant

Abstract

To provide a flying object protection facility and a nuclear power plant which can further suppress intrusion of a flying object, without being restricted by arrangement.SOLUTION: A flying object protection facility includes: a frame body having a plurality of frame members which are arranged around a protection object and are connected to each other; a plurality of net support parts which are fixed to the edge part of the opening of the frame body, and are arranged at an interval in an edge part extending direction; a protection net which is supported by the net support parts, closes the opening so as to spread in an in-plane direction of the opening, and is separated from the frame body at an interval in an out of plane direction perpendicular to the in-plane direction; and a gap filling member which is provided in the gap between the adjacent net support parts, and reduces the dimension in the out of plane direction of the gap.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a missile protection system and a nuclear power plant. [Background technology]

[0002] Nets that protect against falling rocks, landslides, etc. are widely known. To prevent damage to the nets caused by the impact of falling rocks, etc., technologies that can efficiently absorb the energy of falling rocks, etc. have been proposed. For example, Patent Document 1 discloses a flying object protection system that prevents flying objects from entering an object to be protected through a gap between a protective net and a frame that supports the net. The system prevents flying objects from entering by providing a protective plate in front of the gap. One example of an object to be protected is existing equipment in a plant. When an object lifted into the air by a tornado flies toward existing equipment in a plant, etc., it is necessary to protect the equipment from the flying object so that the plant's functionality is not impaired. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-180023 Summary of the Invention [Problem to be solved by the invention]

[0004] However, since the flying object protection equipment described in Patent Document 1 is configured to provide a protective plate in front of the gap, there are cases where the protective plate cannot be installed due to layout restrictions.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide flying object protection equipment and a nuclear plant that can further suppress the intrusion of flying objects without being subject to placement restrictions. [Means for solving the problem]

[0006] In order to solve the above problems, the flying object protection equipment of the present disclosure comprises a frame body having a plurality of connected frame members arranged around an object to be protected, a plurality of net support parts fixed to the edge of an opening of the frame body and arranged at intervals in the direction in which the edge extends, a protective net supported by the net support parts and extending in an in-plane direction of the opening to block the opening and spaced apart from the frame body in an out-of-plane direction perpendicular to the in-plane direction by a gap, and a gap filling member provided in the gap between adjacent net support parts to reduce the dimension of the gap in the out-of-plane direction.

[0007] A nuclear power plant according to the present disclosure includes the above-described flying object protection equipment and plant equipment as an object to be protected by the flying object protection equipment. [Effects of the Invention]

[0008] According to the flying object protection equipment and nuclear power plant disclosed herein, the intrusion of flying objects can be further suppressed without being subject to restrictions on placement. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic diagram of a nuclear power plant according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is an enlarged plan view of a portion of the flying object protection equipment according to an embodiment of the present disclosure. [Figure 3] FIG. 2 is an enlarged side view of a portion of the flying object protection equipment according to an embodiment of the present disclosure. [Figure 4] 1 is a top view of the flying object protection equipment according to the first embodiment of the present disclosure in the XY plane. FIG. [Figure 5] 1 is a cross-sectional view of the flying object protection equipment according to the first embodiment of the present disclosure, taken along the XZ plane. FIG. [Figure 6] FIG. 10 is a top view of the XY plane of the flying object protection equipment according to the second embodiment of the present disclosure. [Figure 7]FIG. 10 is a cross-sectional view of the flying object protection equipment according to the second embodiment of the present disclosure, taken along the XZ plane. [Figure 8] FIG. 10 is a top view of the flying object protection equipment according to the third embodiment of the present disclosure in the XY plane. [Figure 9] FIG. 10 is a cross-sectional view of the flying object protection equipment according to the third embodiment of the present disclosure, taken along the XZ plane. [Figure 10] FIG. 10 is a top view of the XY plane of the flying object protection equipment according to the fourth embodiment of the present disclosure. [Figure 11] FIG. 10 is a cross-sectional view of the flying object protection equipment according to the fourth embodiment of the present disclosure, taken along the XZ plane. [Figure 12] FIG. 10 is a top view of the flying object protection equipment according to the fifth embodiment of the present disclosure in the XY plane. [Figure 13] FIG. 11 is a cross-sectional view of the flying object protection equipment according to the fifth embodiment of the present disclosure, taken along the XZ plane. [Figure 14] FIG. 10 is a cross-sectional view of the XY plane of a flying object protection system according to a sixth embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0011] First Embodiment A nuclear power plant 1 according to an embodiment of the present disclosure will be described in detail below with reference to FIGS. As shown in Fig. 1, the nuclear plant 1 includes a nuclear plant building (not shown), a missile protection system 30, and a plant facility 20 that is the object to be protected. The building of the nuclear plant 1 is omitted from the drawing, but is located further into the paper than the plant facility 20 in Fig. 1. In the following, the nuclear plant building will be simply referred to as the building.

[0012] <Building> A building is a structure that houses various types of equipment for, for example, a nuclear power plant. The building is erected on the ground. The building has exterior walls made of, for example, concrete. These exterior walls separate the building into an indoor area and an outdoor area. On the outdoor side of the building, a flying object protection system 30 and plant equipment 20, which will be described later, are appropriately arranged.

[0013] <Plant facilities> The plant facility 20 is one of the various facilities of a nuclear power plant that is located outside the building. The plant facility 20 is erected on the ground. The plant facility 20 is, for example, a long object such as a pipe or duct for supplying or discharging various fluids. Other examples of the plant facility 20 include a tank, a pump, and a cooling tower.

[0014] <Flying object protection equipment> The flying object protection equipment 30 is a component installed to protect the plant equipment 20 from flying objects caused by strong winds such as tornadoes. The flying object protection equipment 30 is installed on the outdoor side of a building. The flying object protection equipment 30 is installed so as to sandwich the plant equipment 20 between itself and the building. As shown in enlarged views in Figures 2 to 5, the flying object protection equipment 30 includes a frame body 40, a net support part 50, a protective net 60, and a gap filling member 70.

[0015] <Frame> The frame body 40 is a member provided to form a framework for attaching the protective net 60. The frame body 40 includes multiple frame members 41. The frame members 41 are formed, for example, from steel beams. The frame members 41 include those extending vertically from the ground and those extending in a direction perpendicular to the vertical direction. The frame members 41 are connected to each other by a connection method such as welding or bolts. The frame body 40 includes an opening 42 surrounded by the frame members 41. The opening 42 includes not only the space formed therein but also the frame members 41 themselves. The opening 42 is formed in a rectangular shape. The edge of the opening 42 is defined as an edge portion 43. The edge portion 43 is connectable to the net support member 50 and the gap filling member 70. As shown in FIG. 2 , the vertical direction is the Z-axis direction. The direction perpendicular to the vertical direction is the Y-axis direction. That is, the frame members 41 include those extending in the Z-axis direction and those extending in the Y-axis direction.

[0016] Here, directions according to this embodiment are defined as follows: A direction parallel to the plane along which the opening 42 extends is referred to as the in-plane direction Ds. As shown in FIG. 2, the in-plane direction Ds is a direction parallel to a plane formed by the Y-axis direction and the Z-axis direction. Among the in-plane directions Ds, a direction toward the center of the opening 42 is referred to as the inward direction Dsi. Similarly, among the in-plane directions Ds, a direction toward the outside of the opening 42 is referred to as the outward direction Dso. Furthermore, a direction perpendicular to the in-plane direction Ds is referred to as the out-plane direction Dn. As shown in FIG. 3, the out-plane direction Dn is the X-axis direction. Among the out-plane directions Dn, a direction toward the outdoors is referred to as one out-plane direction side Dno. Similarly, among the out-plane directions Dn, a direction toward the indoors is referred to as the other out-plane direction side Dni.

[0017] <Net support part> The net support part 50 is a member provided to support the protective net 60. The net support part 50 is fixed to the edge part 43 of the opening 42. The net support part 50 includes a mounting plate 51 and a net mounting hardware 52. The mounting plate 51 is a member provided to serve as a fixed end of the protective net 60. The mounting plate 51 is connected to the frame member 41. The mounting plate 51 is connectable to a wire rope 61 of the protective net 60, which will be described later. The net mounting hardware 52 is connected to the frame member 41. The net mounting hardware 52 is configured so that the wire rope 61 of the protective net 60, which will be described later, can be wound around and supported. The net mounting hardware 52 includes a tap seat 53, a holding tube 54, and a flange part 55.

[0018] The tap seat 53 is provided so that the net mounting hardware 52 can be connected to the frame member 41. The tap seat 53 is connected to the frame member 41, for example, via a bolt. The tap seat 53 is connected to the frame member 41 on the surface facing the other out-of-plane side Dni. The tap seat 53 is provided with a flange portion 55 and a retaining tube 54 on the surface facing one out-of-plane side Dno. The tap seat 53 is connected to a base end portion 56 of the flange portion 55, which will be described later, on the surface facing one out-of-plane side Dno.

[0019] The flange portion 55 is provided so that the wound wire rope 61 does not come off the holding tube 54. The flange portion 55 has a base end 56 and a tip end 57. The base end 56 is connected to the tap seat 53 on the surface facing the other out-of-plane side Dni. The base end 56 may be connected to the tap seat 53 by welding, or may be connected to the tap seat 53 via a bolt. The base end 56 is connected to the holding tube 54 on the surface facing the one out-of-plane side Dno. The tip end 57 is connected to the holding tube 54 on the surface facing the other out-of-plane side Dni.

[0020] The holding tube 54 is provided so that the wire rope 61 of the protective net 60 can be wound around it. The holding tube 54 is a cylinder extending in the out-of-plane direction Dn. The holding tube 54 is connected at both ends in the out-of-plane direction Dn to a base end 56 and a tip end 57 of the flange portion 55. The holding tube 54 and the flange portion 55 may be connected to each other by welding, or may be formed as a single unit.

[0021] The tip portion 57 is provided so as to expand the diameter of the holding tube 54. The cross section of the tip portion 57 in the out-of-plane direction Dn is not limited to a circle, and may be, for example, a polygon. The base portion 56 may have the same shape as the tip portion 57, or may not. In this embodiment, the cross section of the base portion 56 in the out-of-plane direction Dn is the same as the cross section of the tap seat 53 in the out-of-plane direction Dn. The base portion 56, together with the tap seat 53, is connected to the frame member 41 via bolts.

[0022] The net mounting hardware 52 is provided at the edge 43 of the opening 42 and is connected to the frame member 41 at the four corners of the rectangular shape. That is, four net mounting hardware 52 are provided for one opening 42. The mounting plate 51 is provided at the edge 43 of the opening 42 and is connected to the frame member 41 extending in the vertical direction. The mounting plate 51 is provided so as to be positioned between two net mounting hardware 52 in the vertical direction. That is, two mounting plates 51 are provided for one opening 42. The mounting plate 51 and the net mounting hardware 52 do not abut against each other.

[0023] <Protection net> The protective net 60 is installed to cover the opening 42 and catch objects blown in by strong winds. The protective net 60 is supported by a mounting plate 51 and a net mounting hardware 52. The protective net 60 is installed to extend in a plane parallel to the opening 42. The protective net 60 is installed so as to form a gap between itself and the frame body 40 in the out-of-plane direction Dn. Two protective nets 60 are installed overlapping each other in the out-of-plane direction Dn, but the drawings and the following explanation will be given as if only one net is installed. The protective net 60 includes a wire rope 61, a protective net main body 62, and a turnbuckle 63.

[0024] The wire rope 61 is a member that can serve as a framework for stretching the safety net 60 in a planar form. The wire rope 61 is provided on the outer periphery of the safety net 60. One end of the wire rope 61 is connected to the mounting plate 51. The wire rope 61 is wound around the holding tube 54 of one of the net mounting hardware 52 that is adjacent to the mounting plate 51 in the Z-axis direction to which the other end is fixed. The wire rope 61 extends parallel to the net mounting hardware 52 around which it is wound in the Y-axis direction and is wound around the holding tube 54 of a different net mounting hardware 52. The wire rope 61 further extends parallel to the Z-axis direction and is further wound around the holding tube 54 of a different net mounting hardware 52. After extending in the Z-axis direction and being wound around the holding tube 54, the wire rope 61 extends in a Z-axis direction and is then folded back in the Z-axis direction and is connected at the other end to a mounting plate 51 that is different from the mounting plate 51 to which the one end is connected.

[0025] In this way, one wire rope 61 is provided so as to extend taut in the Z-axis direction and the Y-axis direction. Another wire rope 61 is provided so as to join with the previously mentioned one wire rope 61 to form a framework having substantially the same rectangular shape as the opening 42. In this way, the two wire ropes 61 form a framework for tensioning one protective net 60 in a planar manner. At least one end of the wire rope 61 is provided with a turnbuckle 63 so that the tension strength of the wire rope 61 can be adjusted.

[0026] The protective net main body 62 is provided to form a surface that catches objects blown in by strong winds. The protective net 60 is provided to cover the opening 42. The protective net main body 62 is made up of bundles of multiple metal wires arranged in a mesh pattern. The protective net main body 62 is connected to the wire rope 61 on its outer periphery. The protective net main body 62 is stretched by the wire rope 61 and spreads over a surface that conforms to the opening 42. That is, the protective net 60 and the protective net main body 62 are provided to spread in the in-plane direction Ds. The protective net main body 62 is provided over the entire rectangular frame formed by the wire rope 61. Two protective nets 60 are provided overlapping each other in the out-of-plane direction Dn, and the mesh sizes of the protective net main bodies 62 may be different or the same.

[0027] <Gap filling material> The gap filling member 70 is a member arranged to fill a gap. That is, the gap filling member 70 is arranged so that at least a portion thereof is arranged between the frame body 40 and the protective net 60 in the out-of-plane direction Dn. The gap filling member 70 is arranged so as to abut against the frame body 40 or the wire rope 61. The gap filling member 70 according to the first embodiment is a protective plate 71. The protective plate 71 is arranged so as to be connected to the frame body 40. The protective plate 71 is arranged so as to be sandwiched between the net mounting hardware 52 in the Y-axis direction. The protective plate 71 is arranged so as not to abut against the net mounting hardware 52. The protective plate 71 is configured to include, for example, a steel plate. The protective plate 71 includes a frame body connection portion 72 and a shielding portion 73.

[0028] The frame body connection portion 72 is connected to the frame body 40 by welding or bolts. The frame body connection portion 72 is a plate-shaped member extending in the in-plane direction Ds. The frame body connection portion 72 is connected to the frame body 40 on one side surface. The frame body connection portion 72 is connected to the shielding portion 73 on the other side surface at an end portion on the vertically upper side. The shielding portion 73 is connected to the frame body connection portion 72 by welding or bolts. The shielding portion 73 is a plate-shaped member extending in the out-of-plane direction Dn from the connection portion with the frame body connection portion 72. The shielding portion 73 is connected to the frame body connection portion 72 at an end portion on the other out-of-plane direction side Dni. The shielding portion 73 extends to one out-of-plane direction side Dno, and its end portion does not abut the protective net 60. In other words, the shielding portion 73 and the protective net 60 are provided with a gap between them in the out-of-plane direction Dn. The frame body connection portion 72 and the shielding portion 73 may be formed as a single unit. The shielding portion 73 extends so as to overlap with the wire rope 61 when viewed from the out-of-plane direction Dn. The position of the shielding portion 73 is not limited to this.

[0029] Note that Fig. 4 shows an enlarged view of a portion of the flying object protection equipment 30 shown in Fig. 3, viewed from above in the vertical direction. For simplicity, the vertically extending frame member 41 is omitted from Fig. 4. Fig. 5 shows a cross-sectional view of the portion shown in Fig. 4 in the Y-axis direction. Similar omissions are made in Fig. 6 and subsequent figures.

[0030] <Action and effect> The above-described flying object protection system 30 and nuclear plant 1 can protect the plant equipment 20, which is the object of protection, by covering it with a protective net 60. Specifically, the protective net 60 is provided so as to block the opening 42 formed by the frame body 40. The protective net 60 is supported by the net support portion 50 and extends in the in-plane direction Ds of the opening 42 of the frame body 40. Therefore, flying objects caused by strong winds such as a tornado collide with the protective net 60 without heading directly toward the plant equipment 20. When impacted by a flying object, the protective net 60 bends in the out-of-plane direction Dn to absorb the impact. Therefore, the protective net 60 can protect the object to be protected from flying objects caused by strong winds such as a tornado.

[0031] In the flying object protection equipment 30 according to the first embodiment, a gap is formed between the frame body 40 and the protective net 60. The protective plate 71 is connected to the frame body 40, thereby narrowing the gap in the out-of-plane direction Dn. In other words, the dimension of the gap is reduced in the out-of-plane direction Dn. This allows the flying object protection equipment 30 to be configured so that flying objects are less likely to enter through the gap. Furthermore, the protective plate 71 is disposed on the other out-of-plane direction Dni than the protective net 60 in the out-of-plane direction Dn. Furthermore, the shielding portion 73 extends so as to overlap with the wire rope 61 when viewed from the out-of-plane direction Dn. Therefore, the protective plate 71 is disposed on the other out-of-plane direction Dni relative to the protective net 60, and is also disposed in approximately the same direction as the extension of the wire rope 61 in the in-plane direction Ds. Therefore, by providing a member for preventing the intrusion of flying objects in the gap itself, which is inevitably formed, rather than around the gap, it is possible to prevent the intrusion of flying objects without being restricted by placement restrictions.

[0032] Furthermore, flying objects that may enter through the gap are not only prevented from entering by colliding with the protective plate 71. The protective plate 71 narrows the gap in the out-of-plane direction Dn, further limiting the angle at which the flying object can enter through the gap. When a flying object enters through a gap, it will not collide with the frame 40 or the protective plate 71 if the flying object has a speed that is approximately along the vertical direction. In this case, even if the flying object enters through the gap, it will head toward the ground and will not head directly toward the plant equipment 20. In this way, the protective plate 71 can be used to configure a flying object protection system 30 that can better protect the plant equipment 20, which is the target of protection, from flying objects.

[0033] Furthermore, according to the first embodiment, the above-described effects can be achieved while suppressing an increase in the weight of the flying object protection equipment 30. For example, compared to when a wall portion is provided to cover the entire opening 42, the protective plate 71, which is the gap filling member 70 according to the first embodiment, is compact. In other words, the weight of the flying object protection equipment 30 can be reduced. Furthermore, because the protective plate 71 is provided on the edge portion 43, it is possible to suppress the intrusion of flying objects through the gap while still allowing the protective net 60 to exhibit its cushioning properties.

[0034] Second Embodiment Next, a second embodiment will be described with reference to Figures 6 and 7. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0035] The flying object protection equipment 30 and the nuclear plant 1 according to the second embodiment differ from those of the first embodiment in the configuration of the gap filling member 70. As shown in Figures 6 and 7, the gap filling member 70 according to the second embodiment includes a protrusion 74 and a cord body 75.

[0036] The protrusion 74 is provided on the frame body 40 and extends toward one out-of-plane direction side Dno. In other words, the protrusion 74 is connected to the frame body 40 and provided so as to protrude toward the protective net 60 in the out-of-plane direction Dn. The protrusion 74 may be formed integrally with the frame body 40, or may be formed separately and connected by welding or bolts. Multiple protrusions 74 are provided and scattered in the Y-axis direction. The protrusions 74 are provided at their ends on the one out-of-plane direction side Dno so as to be able to support the cord body 75. Furthermore, the protrusions 74 are provided so as not to abut against the protective net 60. In other words, the protrusions 74 and the protective net 60 are provided at an interval in the out-of-plane direction Dn.

[0037] The rope 75 is arranged so as to be placed in the gap. The rope 75 is arranged so as to be supported by the protrusions 74. The rope 75 is arranged so as to extend in the Y-axis direction. The rope 75 is arranged so as to be supported by the multiple protrusions 74 and thus is prevented from sagging. An example of the rope 75 is a wire rope. Furthermore, the rope 75 extends so as to overlap with the wire rope 61 when viewed from the out-of-plane direction Dn. However, the position of the rope 75 is not limited to this.

[0038] <Action and effect> In the flying object protection equipment 30 according to the second embodiment, a protrusion 74 and a rope 75 are provided in the gap. The protrusion 74 and the rope 75 divide the gap in the out-of-plane direction Dn. That is, the gap is narrowed in the out-of-plane direction Dn. This allows the size of the gap to be smaller than the expected size of a flying object. Therefore, flying objects of expected size can be prevented from entering through the gap. Alternatively, if a flying object attempts to enter through the gap, its momentum is reduced by colliding with the protrusion 74 or the rope 75. Furthermore, as in the first embodiment, the plant facility 20 can also be protected by limiting the angle at which a flying object can enter.

[0039] Furthermore, the cord 75 is disposed on the other out-of-plane direction Dni than the protective net 60 in the out-of-plane direction Dn. Furthermore, the cord 75 extends so as to overlap with the wire rope 61 when viewed from the out-of-plane direction Dn. Therefore, the cord 75 is disposed on the other out-of-plane direction Dni with respect to the protective net 60, and is also disposed in approximately the same direction as the extension of the wire rope 61 in the in-plane direction Ds. Therefore, by providing a member for preventing the intrusion of flying objects in the gap itself that is inevitably formed, rather than around the gap, it is possible to suppress the intrusion of flying objects without being subject to restrictions on placement.

[0040] Furthermore, according to the second embodiment, the above-mentioned effects can be achieved while further suppressing an increase in the weight of the flying object protection equipment 30. Furthermore, since the protrusions 74 and the cords 75 are provided on the edge 43, it is possible to suppress the intrusion of flying objects through gaps while still allowing the protective net 60 to exhibit its cushioning properties.

[0041] Third Embodiment Next, a third embodiment will be described with reference to Figures 8 and 9. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0042] The flying object protection system 30 and the nuclear plant 1 according to the third embodiment differ from those of the first embodiment in the configuration of the protective net 60. The protective net 60 is configured to also function as a gap filling member 70. As shown in Figures 8 and 9, in the protective net 60 according to the third embodiment, the protective net main body 62 extends further in the in-plane direction Ds and the out-of-plane direction Dn than the wire ropes 61.

[0043] The protective net main body 62 according to the third embodiment includes a net main body portion 62A and an expansion portion 62B. The net main body portion 62A and the expansion portion 62B may be integral or may be separate and connected. The net main body portion 62A is the portion of the protective net main body 62 stretched by the wire ropes 61 so as to extend in the in-plane direction Ds. The net main body portion 62A includes a portion connected to the wire ropes 61 and extends inward Dsi in the in-plane direction Ds relative to the rectangular frame formed by the wire ropes 61. The expansion portion 62B is the portion of the protective net main body 62 that extends outward Dso in the in-plane direction Ds relative to the rectangular frame formed by the wire ropes 61. The expansion portion 62B also extends in the out-of-plane direction Dn. Specifically, the expansion portion 62B also extends from the wire ropes 61 toward the other out-of-plane direction Dni. The expansion portion 62B is connected to the frame body 40 at its end on the other out-of-plane direction Dni. The expanded portion 62B and the frame body 40 may be fixed or temporarily fastened together.

[0044] <Action and effect> In the flying object protection equipment 30 according to the third embodiment, the protective net 60 is configured to double as a gap-filling member 70. Specifically, the expansion portion 62B is provided to function as the gap-filling member 70. The expansion portion 62B covers the gap in the out-of-plane direction Dn. In other words, the protective cover is provided so as not to create a gap between the protective cover and the frame body 40 in the out-of-plane direction Dn. Therefore, the expansion portion 62B makes it even more difficult for flying objects to enter through the gap. Furthermore, the expansion portion 62B is disposed on the other out-of-plane direction Dni than the net main body portion 62A in the out-of-plane direction Dn. Therefore, by providing a member for preventing the entry of flying objects in the gap itself, which is inevitably formed rather than around the gap, the entry of flying objects can be suppressed without being subject to placement restrictions.

[0045] Furthermore, according to the third embodiment, the above-mentioned effects can be achieved simply by expanding the protective net main body 62 and preparing parts for connecting it to the frame body 40. This makes it possible to suppress an increase in the weight of the entire flying object protection equipment 30. Furthermore, it is possible to prevent flying objects from entering through gaps while still allowing the protective net 60 to exert its cushioning properties.

[0046] <Fourth embodiment> Next, a fourth embodiment will be described with reference to Figures 10 and 11. In the fourth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0047] The flying object protection system 30 and the nuclear plant 1 according to the fourth embodiment differ from those of the first embodiment in the configuration of the gap filling member 70. As shown in Figures 10 and 11 , the gap filling member 70 according to the fourth embodiment includes a rope winding member 76 attached to the wire rope 61.

[0048] The rope winding member 76 is attached so as to be wound around the wire rope 61. The rope winding member 76 is provided so that at least a portion thereof is disposed between the gap and the frame body 40 in the out-of-plane direction Dn. In other words, the rope winding member 76 extends along the extension direction of the wire rope 61 while being disposed around the wire rope 61. The rope winding member 76 may be, for example, a metal wire. Alternatively, the end of the protective net main body 62 may be structured so as to be wound around the wire rope 61.

[0049] <Action and effect> In the flying object protection equipment 30 according to the fourth embodiment, the gap is intermittently covered by the rope winding member 76. Therefore, the gap is substantially narrowed in the out-of-plane direction Dn. When a flying object collides with the rope winding member 76, the rope winding member 76 prevents the flying object from entering or at least reduces the momentum of the flying object. Therefore, the plant equipment 20 can be protected from flying objects that may enter through the gap. Note that a configuration in which the end of the protective net main body 62 is wound around the wire rope 61 can also narrow the gap in the out-of-plane direction Dn, thereby achieving the same effect.

[0050] Furthermore, the rope winding member 76 is attached to the wire rope 61. Therefore, the gap can be narrowed in the out-of-plane direction Dn without being connected to the frame member 41. This makes it possible to obtain the above-described effect even when, for example, it is difficult to arrange a member for filling the gap in the frame member 41. Therefore, by providing a member for preventing the intrusion of flying objects in the gap itself, which is inevitably formed, rather than around the gap, it is possible to prevent the intrusion of flying objects without being restricted by arrangement.

[0051] Moreover, according to the fourth embodiment, it is possible to achieve the above-mentioned effects while further suppressing an increase in the weight of the entire flying object protection equipment 30. Furthermore, it is possible to suppress the intrusion of flying objects through gaps while still allowing the cushioning properties of the protective net 60 to be exerted.

[0052] Fifth Embodiment Next, a fifth embodiment will be described with reference to Figures 12 and 13. In the fifth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0053] The flying object protection system 30 and the nuclear plant 1 according to the fifth embodiment differ from those of the first embodiment in the configuration of the frame member 41. The frame member 41 is configured to also function as a gap filling member 70. As shown in Figures 12 and 13, the frame member 41 according to the fifth embodiment includes a first portion 41A and a second portion 41B.

[0054] As shown in FIG. 12 , the first portion 41A extends in the Y-axis direction. The first portion 41A has a first surface 41a on one side Dno in the out-of-plane direction. A net mounting hardware 52 is fixed to the first surface 41a of the first portion 41A. The second portion 41B extends in the Y-axis direction. The second portion 41B is provided so as to be positioned between adjacent net mounting hardware 52. Specifically, the second portion 41B is provided so as to be positioned between adjacent net mounting hardware 52 that are supported by a wire rope 61 stretched in the Y-axis direction. The second portion 41B has a second surface 41b on one side Dno in the out-of-plane direction. The second surface 41b is provided so as to face the protective net 60. The second surface 41b is provided so as to be positioned closer to the protective net 60 than the first surface 41a in the out-of-plane direction Dn. The first portion 41A and the second portion 41B are connected to each other at a surface that contacts each other in the Y-axis direction.

[0055] The frame member 41, which includes a first portion 41A and a second portion 41B and extends in the Y-axis direction, can be expressed as follows: The frame member 41 extending in the Y-axis direction has different cross sections in the Y-axis direction between the first portion 41A and the second portion 41B. The cross section in the Y-axis direction of the second portion 41B is larger than that of the first portion 41A.

[0056] 13 shows a configuration in which the cross section in the Z-axis direction of frame member 41 extending in the Z-axis direction also changes, but this is not limited to this. That is, frame member 41 extending in the Z-axis direction may have a surface that extends parallel to the surface to which net mounting hardware 52 is fixed, and the cross section in the Z-axis direction may not change.

[0057] <Action and effect> In the flying object protection equipment 30 according to the fifth embodiment, the second surface 41b is positioned so as to approach the protective net 60 in the out-of-plane direction Dn. In other words, the first portion 41A and the protective net 60 are positioned so as to approach each other in the out-of-plane direction Dn. Therefore, the gap formed between the second portion 41B and the protective net 60 is narrowed in the out-of-plane direction Dn. This makes it more difficult for flying objects to enter through the gap. Furthermore, this configuration does not require any additional components other than modifying the configuration of the frame member 41. Therefore, by providing a member for preventing the entry of flying objects in the gap itself, which inevitably forms rather than around the gap, the entry of flying objects can be suppressed without any restrictions on placement. Furthermore, the above-described effects can be achieved while further minimizing the increase in the weight of the flying object protection equipment 30 as a whole.

[0058] Sixth Embodiment Next, a sixth embodiment will be described with reference to Fig. 14. In the sixth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0059] The flying object protection equipment 30 and the nuclear plant 1 according to the sixth embodiment differ from those of the first embodiment in the configuration of the gap filling member 70. As shown in Fig. 14, the gap filling member 70 according to the sixth embodiment includes an L-shaped member 77 having a first plate portion 77A and a second plate portion 77B, and a base portion 78.

[0060] The base portion 78 is provided so as to sandwich the frame member 41 from both sides in the Y-axis direction. The base portion 78 is connected to and fixed to the frame member 41. The base portion 78 is also provided so as to have a surface that extends in the in-plane direction Ds on one out-of-plane side Dno relative to the frame member 41. The surface of the base portion 78 facing the one out-of-plane side Dno can be connected to the first plate portion 77A of the L-shaped member 77.

[0061] The first plate portion 77A is a plate-like member extending in the in-plane direction Ds. The first plate portion 77A is connected to the base portion 78 on a surface facing the other out-of-plane direction side Dni. The first plate portion 77A protrudes inward Dsi of the opening 42 in the in-plane direction Ds. That is, the surface of the first plate portion 77A facing the other in-plane direction Ds has an area that abuts against the base portion 78 and an area that does not abut against the base portion 78. The first plate portion 77A is connected to the second plate portion 77B at a tip end on the inward side Dsi in the in-plane direction Ds.

[0062] The second plate portion 77B is a plate-shaped member extending in the out-of-plane direction Dn. The second plate portion 77B is connected to the tip of the first plate portion 77A on the inner side Dsi in the in-plane direction Ds. The second plate portion 77B extends from the portion connected to the first plate portion 77A so as to protrude toward one side Dno in the out-of-plane direction. The second plate portion 77B is arranged so as not to abut against the protective net 60. In other words, the second plate portion 77B and the protective net 60 are arranged with a gap between them in the out-of-plane direction Dn.

[0063] Note that a structure in which the L-shaped member 77 is provided without providing the base portion 78 may also be used. That is, a concept in which the frame body 40 and the L-shaped member 77 are directly connected and fixed may also be used. Furthermore, the first plate portion 77A and the second plate portion 77B may be formed integrally, or may be formed separately and connected to each other.

[0064] <Action and effect> The flying object protection equipment 30 according to the sixth embodiment includes an L-shaped member 77 having a first plate portion 77A that protrudes from the frame member 41 in the in-plane direction Ds toward the inside Dsi of the opening 42. Because the L-shaped member 77 protrudes toward the inside Dsi of the opening 42, the gap is narrowed in both the out-of-plane direction Dn and the in-plane direction Ds. This makes it more difficult for flying objects to enter through the gap. Furthermore, the L-shaped member 77 is provided inward Dsi in the in-plane direction Ds with respect to the protective net 60. Therefore, by providing a member for preventing the entry of flying objects in the gap itself, which is inevitably formed, rather than around the gap, the entry of flying objects can be suppressed without restrictions on placement.

[0065] <Other embodiments> The above describes in detail the embodiments of the present disclosure with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope that does not deviate from the gist of the present disclosure.

[0066] For example, a configuration according to an embodiment of the present disclosure may be combined in multiple ways.

[0067] Furthermore, although the present disclosure has shown a mode of protecting the plant equipment 20 from flying objects coming from above in the vertical direction, the present invention is not limited to this. The entirety of the opening 42 may be provided with a similar structure, thereby configuring the entire flying object protection equipment 30 to further suppress the intrusion of flying objects.

[0068] <Additional Notes> The flying object protection system 30 and the nuclear plant 1 described in each embodiment can be understood, for example, as follows.

[0069] (1) The flying object protection equipment 30 of the first embodiment comprises a frame body 40 arranged around an object to be protected and having a plurality of connected frame members 41; a plurality of net support parts 50 fixed to the edge part 43 of an opening 42 of the frame body 40 and arranged at intervals in the direction in which the edge part 43 extends; a protective net 60 supported by the net support parts 50 and extending in an in-plane direction Ds of the opening 42 to block the opening 42 and spaced apart from the frame body 40 via a gap in an out-of-plane direction Dn perpendicular to the in-plane direction Ds; and a gap filling member 70 provided in the gap spanning between adjacent net support parts 50 to reduce the dimension of the gap in the out-of-plane direction Dn.

[0070] According to the above configuration, the protective net 60 is provided to block and protect the object to be protected. The protective net 60 is supported by the net support portion 50 and extends in the in-plane direction Ds of the opening 42 of the frame body 40. Therefore, the protective net 60 can protect the object to be protected from flying objects caused by strong winds such as those caused by tornadoes. Furthermore, a gap is formed between the protective net 60 and the frame body 40 in the out-of-plane direction Dn. The gap filling member 70 reduces the dimension of the gap in the out-of-plane direction Dn, making it possible to restrict flying objects that may enter through this gap. Furthermore, by providing a member for preventing the entry of flying objects in the gap itself, which is inevitably formed rather than around the gap, the entry of flying objects can be suppressed without restrictions on placement.

[0071] (2) The flying object protection equipment 30 according to the second aspect is the flying object protection equipment 30 of (1), in which the gap filling member 70 is a protection plate 71 fixed to the frame member 41.

[0072] According to the above configuration, the protective plate 71 reduces the dimension of the gap in the out-of-plane direction Dn. This narrows the gap, making it more difficult for flying objects to enter through the gap. Furthermore, by narrowing the gap in the out-of-plane direction Dn, the angle of entry of any flying object that may enter through the gap is limited. This prevents the flying object from heading directly toward the object to be protected, even if it does enter through the gap.

[0073] (3) A third aspect of the flying object protection equipment 30 is the flying object protection equipment 30 of (1), in which the gap filling member 70 is provided on the frame body 40 and includes a protrusion 74 that protrudes toward the protective net 60 in the out-of-plane direction Dn, and a cord body 75 that is supported by the protrusion 74 and extends along the edge 43 within the gap, spaced apart from the frame body 40 and the protective net 60.

[0074] According to the above configuration, the gap is provided with a cord 75 extending along the edge 43. This narrows the gap in the out-of-plane direction Dn, making it difficult for flying objects to enter through the gap without being subject to restrictions on placement. Furthermore, this configuration can achieve the above-mentioned effects while suppressing an increase in the weight of the entire flying object protection equipment 30.

[0075] (4) The flying object protection equipment 30 of the fourth aspect is the flying object protection equipment 30 of (1), further comprising a wire rope 61 extending along the outer periphery of the protective net 60 and supporting the protective net 60, the wire rope 61 being wound around the net support part 50 so that the protective net 60 is supported by the net support part 50, the protective net 60 has an expansion part 62B that extends further in the out-of-plane direction Dn than the wire rope 61, and the gap filling member 70 is the expansion part 62B.

[0076] According to the above configuration, the protective net 60 is provided with wire ropes 61 on its outer periphery. The protective net 60 also has enlarged portions 62B that extend further in the out-of-plane direction Dn than the wire ropes 61. The enlarged portions 62B cover the gaps in the out-of-plane direction Dn. Therefore, the enlarged portions 62B can make it more difficult for flying objects to enter through the gaps without being subject to restrictions on placement.

[0077] (5) The flying object protection equipment 30 of the fifth aspect is the flying object protection equipment 30 of (1), further comprising a wire rope 61 that extends along the outer periphery of the protective net 60 and supports the protective net 60, the wire rope 61 being wound around the net support part 50, thereby supporting the protective net 60 on the net support part 50, and the gap filling member 70 is a rope winding member 76 attached so as to be wound around the wire rope 61.

[0078] According to the above configuration, the protective net 60 is provided with the wire rope 61 on its outer periphery. The rope winding member 76 is attached so as to be wound around the wire rope 61, thereby narrowing the gap in the out-of-plane direction Dn. Therefore, it is possible to make it difficult for flying objects to enter through the gap without being subject to restrictions on placement.

[0079] (6) The flying object protection equipment 30 of the sixth aspect is the flying object protection equipment 30 of (1), wherein the frame member 41 has a first part 41A facing the protective net 60 in the out-of-plane direction Dn and having a first surface 41a to which the net support part 50 is fixed, and a second part 41B located between adjacent net support parts 50 and having a second surface 41b facing the protective net 60 in the out-of-plane direction Dn and located closer to the protective net 60 than the first surface 41a, and the gap filling member 70 is the second part 41B.

[0080] According to the above configuration, the frame 40 includes a first portion 41A having a first surface 41a and a second portion 41B having a second surface 41b. A net support portion 50 is fixed to the first surface 41a. The second surface 41b is configured to be closer to the protective net 60 in the out-of-plane direction Dn than the first surface 41a. Therefore, in the portion where the second portion 41B is provided, the gap is narrower in the out-of-plane direction Dn. This makes it more difficult for flying objects to enter through the gap without being subject to restrictions on placement.

[0081] (7) The flying object protection equipment 30 according to the seventh aspect is the flying object protection equipment 30 of (1), in which the gap filling member 70 is an L-shaped member 77 having a first plate portion 77A that protrudes from the frame member 41 in the in-plane direction Ds toward the inside Dsi of the opening 42, and a second plate portion 77B that protrudes from the tip of the first plate portion 77A toward the protective net 60 in the out-of-plane direction Dn.

[0082] According to the above configuration, the flying object protection equipment 30 includes an L-shaped member 77 having a first plate portion 77A that protrudes from the frame member 41 in the in-plane direction Ds toward the inside Dsi of the opening 42. The gap is narrowed by the L-shaped member 77 protruding toward the inside Dsi of the opening 42. Therefore, it is possible to make it more difficult for flying objects to enter through the gap without being restricted by placement restrictions.

[0083] (8) The nuclear power plant 1 according to the eighth aspect includes the flying object protection equipment 30 of (1) to (7) and the plant equipment 20 as a target to be protected by the flying object protection equipment 30.

[0084] According to the above configuration, it is possible to construct a nuclear power plant 1 that can reduce the gap formed between the protective net 60 and the frame body 40 without being subject to placement restrictions, and can further prevent flying objects from entering the plant equipment 20 through the gap. [Explanation of symbols]

[0085] 1. Nuclear power plants 20 Plant Equipment 30. Flying object protection equipment 40 Frame 41 Frame members 41A Part 1 41a Front page 41B Second part 41b Second side 42 Opening 43 Edge 50 Net support part 51 Mounting plate 52 Net mounting hardware 53 Tap seat 54 Holding tube 55 flange 56 Proximal end 57 Tip 60 Protective Net 61 Wire Rope 62 Protective net body 62A Net body 62B Enlarged section 63 Turnbuckle 70 Gap filling material 71 Protective plate 72 Frame body connection part 73 Shielding part 74 Protrusion 75 Chord body 76 Rope winding member 77 L-shaped member 77A First plate part 77B Second plate part 78 Base Ds in-plane direction Dsi inward Dso outward Dn Out-of-plane direction Dno Out-of-plane direction one side Dni Out-of-plane direction other side

Claims

1. a frame body disposed around the object to be protected and having a plurality of connected frame members; A plurality of net support parts fixed to the edge of the opening of the frame body and arranged at intervals in the direction in which the edge extends; A protective net is supported by the net support portion, expands in an in-plane direction of the opening to close the opening, and is spaced apart from the frame body via a gap in an out-of-plane direction perpendicular to the in-plane direction; A gap filling member provided in the gap between adjacent net support portions to reduce the dimension of the gap in the out-of-plane direction; This is a protective equipment against flying objects.

2. The gap filling member is 2. The flying object protection system according to claim 1, wherein the flying object protection system is a protective plate fixed to the frame member.

3. The gap filling member is a protrusion provided on the frame body and protruding toward the protective net in the out-of-plane direction; a cord supported by the protruding portion and extending along the edge portion within the gap and spaced apart from the frame body and the protective net; The flying object protection system according to claim 1, comprising:

4. further comprising a wire rope extending along the outer periphery of the protective net to support the protective net; The wire rope is wound around the net support portion, so that the protective net is supported by the net support portion, The protective net has an expanded portion that expands in the out-of-plane direction more than the wire rope, The flying object protection system according to claim 1 , wherein the gap filling member is the enlarged portion.

5. further comprising a wire rope extending along the outer periphery of the protective net to support the protective net; The wire rope is wound around the net support portion, so that the protective net is supported by the net support portion, 2. The flying object protection system according to claim 1, wherein the gap filling member is a rope winding member attached so as to be wound around the wire rope.

6. The frame member is a first portion having a first surface facing the protective net in the out-of-plane direction and to which the net support portion is fixed; a second portion located between adjacent net support portions and having a second surface facing the protective net in the out-of-plane direction and positioned closer to the protective net than the first surface; and The flying object protection system according to claim 1 , wherein the gap filling member is the second part.

7. The gap filling member is The flying object protection equipment described in claim 1 is an L-shaped member having a first plate portion that protrudes from the frame member toward the inside of the opening in the in-plane direction, and a second plate portion that protrudes from the tip of the first plate portion toward the protective net in the out-of-plane direction.

8. The flying object protection equipment according to any one of claims 1 to 7, Plant equipment as a protection target by the flying object protection equipment; A nuclear power plant having:

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