Flying object protection equipment and nuclear power plant

Abstract

To provide a flying object protective facility and a nuclear power plant capable of further suppressing the intrusion of a flying object while exhibiting the cushioning property of a protective net.SOLUTION: The flying object protective equipment includes a frame body disposed around an object to be protected and having a plurality of connected frame members, a net support portion fixed to an edge portion of an opening portion of the frame body, a protective net supported by the net support portion and closing the opening portion so as to spread in an in-plane direction of the opening portion, and a net drawing portion fixed to the edge portion of the opening portion of the frame body and drawing the protective net to the frame body in an out-of-plane direction orthogonal to the in-plane direction, wherein the net drawing portion has a connection member whose strength is set lower than that of the protective net.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, in the flying object protection equipment described in Patent Document 1, due to its structure, a certain amount of gap is formed between the protective net and the protective plate, so when an unexpected small flying object attacks, it may be allowed to enter inside through the gap. Furthermore, when a flying object collides with the protective net, it is preferable that the protective net itself be able to maximize its cushioning properties and absorb the energy of the flying object.

[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 while maintaining the cushioning properties of the protective net. [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 arranged around an object to be protected and having a plurality of connected frame members, a net support part fixed to the edge of an opening of the frame body, a protective net supported by the net support part and expanding in an in-plane direction of the opening to block the opening, and a net pulling part fixed to the edge of the opening of the frame body and pulling the protective net toward the frame body in an out-of-plane direction perpendicular to the in-plane direction, and the net pulling part has a connecting member set to have a strength lower than that of the protective net.

[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] The flying object protection equipment and nuclear power plant disclosed herein can further suppress the intrusion of flying objects while still providing the cushioning properties of the protective net. [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 cross-sectional view of a flying object protection system according to a first embodiment of the present disclosure. FIG. [Figure 5]1 is an enlarged cross-sectional view of a portion of a flying object protection system according to a first embodiment of the present disclosure. FIG. [Figure 6] FIG. 2 is an enlarged cross-sectional view of a portion of a flying object protection facility according to a modified example of the first 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 building 10 (not shown) of the nuclear plant 1, a missile protection system 30, and a plant facility 20 that is the object to be protected. The building 10 of the nuclear plant 1 is omitted from the drawing, but is provided further into the paper than the plant facility 20 in Fig. 1. In the following, the building 10 of the nuclear plant 1 will be abbreviated to simply "building 10."

[0012] <Building> The building 10 is a structure that houses various facilities of, for example, a nuclear power plant. The building 10 stands on the ground. The building 10 has exterior walls made of, for example, concrete. These exterior walls separate the indoor and outdoor areas of the building 10. On the outdoor side of the building 10, flying object protection equipment 30, plant equipment 20, and the like, which will be described later, are appropriately arranged.

[0013] <Plant facilities> The plant facility 20 is one of the various facilities of the nuclear power plant that is located outside the building 10. 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 the building 10. The flying object protection equipment 30 is installed so as to sandwich the plant equipment 20 between itself and the building 10. In other words, the flying object protection equipment 30 is installed on the outdoor side of the plant equipment 20 when viewed from the building 10. Note that the flying object protection equipment 30 may also be installed on the indoor side of the building 10. As shown in an enlarged view in FIG. 2 , the flying object protection equipment 30 includes a frame body 40, a net support portion 50, a protective net 60, a net pulling portion 70, and an auxiliary protective plate 74.

[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 referred to as an edge portion 43. The edge portion 43 is configured to be connectable to the net support portion 50. 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 rope part 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 rope part 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 rope portion 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 rope portion 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 provided 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 provided to extend in a plane parallel to the opening 42. The protective net 60 is provided 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 provided overlapping each other in the out-of-plane direction Dn, but the drawings and the following description will describe only one protective net. The protective net 60 includes a rope portion 61, a protective net main body 62, and a turnbuckle 63.

[0024] The rope portion 61 is a member that can serve as a framework for stretching the protective net 60 in a planar manner. One end of the rope portion 61 is connected to the mounting plate 51. One end of the rope portion 61 is wound around the holding tube 54 of one of the net mounting hardware 52 that is adjacent to the fixed mounting plate 51 in the Z-axis direction. The rope portion 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 rope portion 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 rope portion 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 rope portion 61 is provided so as to extend taut in the Z-axis direction and the Y-axis direction. Another rope portion 61 is provided so as to combine with the previously mentioned one rope portion 61 to form a framework having substantially the same rectangular shape as the opening 42. In this way, the two rope portions 61 form a framework for tensioning one protective net 60 in a planar manner. At least one end of the rope portion 61 is provided with a turnbuckle 63 so that the tension strength of the rope portion 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 metal wires arranged in a mesh pattern. The protective net main body 62 is connected to the rope portion 61. The protective net main body 62 is stretched by the rope portion 61 and spreads over a surface along 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 rope portion 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] <Net Pulling Department> The net pulling portion 70 is a member that is provided so as to be able to pull the protective net 60 toward the other side Dni in the out-of-plane direction. The net pulling portion 70 includes a connecting member 71. The connecting member 71 is provided so as to pull the protective net 60 toward the other side Dni in the out-of-plane direction. In other words, the connecting member 71 is provided so as to pull the protective net 60 toward the frame body 40. The connecting member 71 is provided so as to be hooked onto the rope portion 61.

[0028] As shown in cross-sectional views about the Z axis in Figures 4 and 5, the net pulling unit 70 according to this embodiment further includes a pulling jig 72. The pulling jig 72 is connected and fixed to the frame body 40. The pulling jig 72 is provided so as to protrude inward Dsi of the opening 42 in the in-plane direction Ds. Multiple pulling jigs 72 are scattered in the Z axis direction. Multiple pulling jigs 72 may also be scattered in the Y axis direction. Note that Figure 4 is symmetrical about the X axis, so the following description will be given using an enlarged view of one frame member 41 and its surroundings, as shown in Figure 5. The pulling jig 72 includes a base portion 73, an auxiliary protective plate 74, and a pulling plate 75.

[0029] The base portion 73 is provided so as to sandwich the frame member 41 from both sides in the Y-axis direction. The base portion 73 is provided on one out-of-plane side Dno of the frame member 41, so as to have a surface extending parallel to the in-plane direction Ds. The base portion 73 is connected to and fixed to the frame member 41. The auxiliary protective plate 74 is provided on the surface of the base portion 73 facing the one out-of-plane side Dno, on the inward side Dsi in the in-plane direction Ds. The pull-in plate 75 is provided on the opposite side of the auxiliary protective plate 74 from the base portion 73 in the out-of-plane direction Dn. The pull-in plate 75 is provided so that its end protrudes inward Dsi in the in-plane direction Ds beyond the auxiliary protective plate 74. The base portion 73, the auxiliary protective plate 74, and the pull-in plate 75 are connected and fixed by bolts. The connection between the base portion 73, the auxiliary protective plate 74, and the pull-in plate 75 is not limited to bolts, but may be made by welding them together, for example, by providing welded portions.

[0030] The pull-in plate 75 is provided so that the connecting member 71 can be connected to it. Specifically, a through-hole penetrating in the out-of-plane direction Dn is formed on the inner side Dsi of the pull-in plate 75 in the in-plane direction Ds, in a portion that does not overlap with the auxiliary protective plate 74 in the out-of-plane direction Dn. The connecting member 71 is provided through the through-hole. That is, the connecting member 71 is provided so as to abut the protective net 60 and the pull-in plate 75. In this way, the connecting member 71 is provided so as to pull the protective net 60 toward the other side Dni in the out-of-plane direction.

[0031] The connecting member 71 may be, for example, a band, rope, or clip. More specifically, a band is made of stainless steel approximately 1 millimeter thick. Such connecting members 71 are designed and installed to have lower strength than the safety net 60, particularly the safety net main body 62. That is, the connecting members 71 are installed so that they can deform preferentially over the safety net 60 when an external force is applied. Here, "strength" refers to the strength of the force required to deform an object. In this disclosure, "deformation" includes not only a change in the shape of an object, but also destruction or cutting of the object. Note that the above definition of "deformation" does not include a return to the state before the external force was applied when the external force is removed. For example, the bending and cushioning of the safety net 60 when it is impacted by a flying object is excluded from the above definition of "deformation."

[0032] The strength of the connecting member 71 is set lower than the strength of the pulling jig 72. The pulling jig 72 is provided by connecting a base portion 73, an auxiliary protective plate 74, and a pulling plate 75, and the strength of this connected portion is referred to as the fixing strength. The pulling jig 72 is fixed to the frame body 40 via bolts or welded portions, and the strength of this connected portion is also referred to as the fixing strength. The strength of the connecting member 71 is set lower than the fixing strength of the pulling jig 72 itself. The strength of the connecting member 71 is set lower than the fixing strength of the pulling jig 72 to the frame body 40. In other words, the connecting member 71 is provided so that it can deform when an external force is applied, taking priority over deformation of the pulling jig 72.

[0033] <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 is provided so as to extend in the in-plane direction Ds of the opening 42 of the frame body 40. Therefore, flying objects 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 blown by strong winds such as those caused by tornadoes.

[0034] In the flying object protection equipment 30 according to this embodiment, a gap is formed between the frame body 40 and the protective net 60. The protective net 60 is pulled toward the other out-of-plane direction Dni by the connecting member 71. Therefore, the connecting member 71 pulls the protective net 60 toward the frame body 40, thereby reducing the gap formed between the frame body 40 and the protective net 60. This further reduces the intrusion of flying objects through this gap. The connecting member 71 also connects the protective net 60 to the frame body 40 and is arranged to extend in the out-of-plane direction Dn. Therefore, the bending direction of the protective net 60 and the extending direction of the connecting member 71 coincide with each other. Therefore, the connecting member 71 can pull the protective net 60 toward the frame body 40 while maintaining a certain degree of flexibility, i.e., cushioning, of the protective net 60.

[0035] Furthermore, the connecting member 71 is set to have a lower strength than the protective net 60. Therefore, when a strong impact is applied to the protective net 60 by a flying object, the connecting member 71 deforms preferentially over the protective net 60. In other words, in this case, the connecting member 71 deforms before the protective net 60 is torn or deformed. The deformation of the connecting member 71 allows the protective net 60 to absorb the impact of the flying object. For example, when the connecting member 71 is cut by the impact of a flying object, the protective net 60 is released from the state in which it was restrained by the connecting member 71. This allows the protective net 60 to maximize its shock-absorbing properties. In other words, after the impact from the flying object is alleviated by the cutting of the connecting member 71, the protective net 60 can maximize its shock-absorbing properties.

[0036] Furthermore, because the connecting member 71 is deformed with priority over the protective net 60, there is no need to repair or replace the protective net 60 when restoring the flying object protection equipment 30. In other words, the flying object protection equipment 30 can be restored by simply replacing the connecting member 71, which makes it possible to facilitate the restoration work.

[0037] Furthermore, the protective net 60 is connected in the out-of-plane direction Dn by a pulling jig 72 that protrudes inside the opening 42 and a connecting member 71. Because the protective net 60 bends in the out-of-plane direction Dn, by connecting it via the pulling jig 72, the connecting member 71 can be deformed more quickly when a strong impact is applied to the flying object protection equipment 30 by a flying object. This can further reduce the risk of the protective net 60 being subjected to an impact that would cause deformation such as tearing. In other words, the protective net 60 becomes less likely to deform, making it easier to restore the flying object protection equipment 30.

[0038] Furthermore, the connecting member 71 is more easily deformed than the pulling jig 72. Therefore, when a flying object causes a strong impact on the flying object protection equipment 30, the connecting member 71 deforms in priority to the pulling jig 72 and the protective net 60, thereby absorbing the impact. Like the protective net 60, the pulling jig 72 is a component that is more difficult to replace than the connecting member 71. Therefore, according to this embodiment, parts that are difficult to restore are less likely to deform, making it easier to restore the flying object protection equipment 30.

[0039] Furthermore, the connecting member 71 is more susceptible to deformation than the fixed portion between the pulling jig 72 and the frame body 40. To be precise, the connecting member 71 is more susceptible to deformation than the fixed portion between the pulling jig 72 and the frame body 40. The pulling jig 72 is fixed to the frame body 40 by bolts or welding. When a strong impact is applied to the flying object protection equipment 30 by a flying object, the connecting member 71 deforms in priority to deformation of the fixed portion between the pulling jig 72 and the frame body 40. Therefore, parts that are difficult to restore are less likely to deform, making it easier to restore the flying object protection equipment 30.

[0040] Furthermore, in this embodiment, examples of the connecting member 71 include a band, a rope, and a clip. By using these as the connecting member 71, when a flying object causes a strong impact on the flying object protection equipment 30, the connecting member 71 is easily and reliably deformed, taking priority over the protective net 60 and the pulling jig 72. Therefore, parts that are difficult to restore are less likely to deform, making it easier to restore the flying object protection equipment 30.

[0041] By using a nuclear power plant 1 equipped with such flying object protection equipment 30, it is possible to construct a nuclear power plant 1 in which the plant equipment 20 is protected by flying object protection equipment 30 that reduces the gap between the protective net 60 and the frame body 40 while maintaining cushioning properties and is easily restoreable.

[0042] <Modification of the first embodiment> Next, a modified example of the first embodiment will be described with reference to Fig. 6. In the modified example of the first embodiment, the same components as those in the first embodiment will be denoted by the same reference numerals, and detailed description thereof will be omitted.

[0043] The flying object protection equipment 30 and the nuclear plant 1 according to the modified example of the first embodiment differ from the first embodiment only in the configuration of the pulling jig 72. As shown in FIG. 6 , the pulling jig 72 according to the modified example of the first embodiment is composed of a base portion 73 and an auxiliary protective plate 74. That is, the pulling plate 75 is not provided. The auxiliary protective plate 74 is provided so that the connecting member 71 can be connected. Specifically, a through hole penetrating in the out-of-plane direction Dn is formed on the inner side Dsi of the auxiliary protective plate 74 in the in-plane direction Ds, in a portion that does not overlap with the base portion 73 in the out-of-plane direction Dn. The connecting member 71 is provided through the through hole provided in the auxiliary protective plate 74. Note that the base portion 73 and the auxiliary protective plate 74 are connected to each other by welding, but the connection method is not limited thereto. For example, they may be connected via bolts.

[0044] <Action and effect> The flying object protection equipment 30 and the nuclear plant 1 according to the modified example of the first embodiment can achieve the same effects as those of the first embodiment while having a simpler structure. By reducing the number of elements constituting the pulling jig 72, the number of connecting parts of the pulling jig 72 itself becomes smaller or fewer, making it easier to increase the fixing strength. Furthermore, by reducing the number of parts, it becomes possible to construct the equipment more cheaply and easily.

[0045] <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.

[0046] For example, the connecting member 71 is not limited to a configuration in which it is connected to the pulling jig 72. A configuration in which the pulling jig 72 is not provided and the connecting member 71 is provided so as to abut the frame body 40 or the net support part 50 against the protective net 60 may also be used. In other words, the net pulling part 70 may not include the pulling jig 72 and may be composed of only the connecting member 71.

[0047] Furthermore, the pulling jig 72 may be configured to be composed of only the base portion 73, and the base portion 73 and the connecting member 71 may be connected to each other.

[0048] <Additional Notes> The flying object protection system 30 and the nuclear plant 1 described in each embodiment can be understood, for example, as follows.

[0049] (1) The flying object protection equipment 30 of the first embodiment comprises a frame body 40 arranged around the object to be protected and having a plurality of connected frame members 41; a net support part 50 fixed to the edge 43 of an opening 42 of the frame body 40; a protective net 60 supported by the net support part 50 and extending in an in-plane direction Ds of the opening 42 to block the opening 42; and a net pulling part 70 fixed to the edge 43 of the opening 42 of the frame body 40 and pulling the protective net 60 to the frame body 40 in an out-of-plane direction Dn perpendicular to the in-plane direction Ds, and the net pulling part 70 has a connecting member 71 set to have a strength lower than that of the protective net 60.

[0050] 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 is provided to extend 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. The protective net 60 is drawn in the out-of-plane direction Dn to the edge portion 43 of the opening 42 of the frame body 40 by the net drawing portion 70. Because the protective net 60 is drawn to the frame body 40 in the out-of-plane direction Dn by the net drawing portion 70, the gap formed between the frame body 40 and the protective net 60 can be reduced.

[0051] In addition, the net pulling unit 70 has a connecting member 71 that is set to have a strength lower than that of the protective net 60. Therefore, when a strong impact is applied to the flying object protection equipment 30 by a flying object, the connecting member 71 is deformed with priority over the protective net 60.

[0052] (2) The second aspect of the flying object protection equipment 30 is the flying object protection equipment 30 of (1), wherein the net pulling section 70 further has a pulling jig 72 fixed to the frame body 40 and protruding inside the opening 42 in the in-plane direction Ds, and the connecting member 71 connects the protective net 60 and the pulling jig 72 in the out-of-plane direction Dn.

[0053] According to the above configuration, the protective net 60 is connected in the out-of-plane direction Dn by the pulling jig 72 that protrudes inside the opening 42 and the connecting member 71. This allows the connecting member 71 to deform more quickly when a strong impact is applied to the flying object protection equipment 30 by a flying object. Therefore, the protective net 60 is less likely to deform, making it easier to restore the flying object protection equipment 30.

[0054] (3) A flying object protection facility 30 according to a third aspect is the flying object protection facility 30 of (2), in which the strength of the connecting member 71 is lower than the strength of the pulling jig 72.

[0055] According to the above configuration, the connecting member 71 is more likely to deform than the pulling jig 72. Therefore, when a strong impact is applied to the flying object protection equipment 30 by a flying object, the connecting member 71 is deformed in priority to the pulling jig 72 and the protective net 60. Therefore, parts that are difficult to restore are less likely to deform, making it easier to restore the flying object protection equipment 30.

[0056] (4) The flying object protection equipment 30 of the fourth aspect is the flying object protection equipment 30 of (2) or (3), in which the pulling jig 72 is fixed to the frame body 40 via a bolt or a weld, and the strength of the connecting member 71 is lower than the fixing strength of the pulling jig 72 to the frame body 40.

[0057] According to the above configuration, the connecting member 71 is more likely to deform than the fixed portion between the pulling jig 72 and the frame body 40. The pulling jig 72 is fixed to the frame body 40 by bolts or welding. When a flying object causes a strong impact on the flying object protection equipment 30, the connecting member 71 deforms preferentially over deformation of such portions. Therefore, portions that are difficult to restore are less likely to deform, making it easier to restore the flying object protection equipment 30.

[0058] (5) The flying object protection equipment 30 according to a fifth aspect is the flying object protection equipment 30 according to any one of (1) to (4), in which the connecting member 71 is any one of a band, a rope, and a clip.

[0059] According to the above configuration, when a flying object causes a strong impact on the flying object protection equipment 30, the connecting member 71 is easily and reliably deformed, taking priority over the protective net 60 and the pulling jig 72. Therefore, areas that are difficult to restore are less likely to deform, making it easier to restore the flying object protection equipment 30.

[0060] (6) A nuclear power plant 1 according to a sixth aspect includes a flying object protection system 30 as described in (1) to (5) and a plant facility 20 as an object to be protected by the flying object protection system 30.

[0061] According to the above configuration, a nuclear power plant 1 can be constructed in which the plant equipment 20 is protected by flying object protection equipment 30 that reduces the gap between the protective net 60 and the frame body 40 while maintaining cushioning properties and is easily restoreable. [Explanation of symbols]

[0062] 1. Nuclear power plants 10 Building 20 Plant Equipment 30. Flying object protection equipment 40 Frame 41 Frame members 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 Rope section 62 Protective net body 63 Turnbuckle 70 Net Pulling Section 71 Connecting member 72 Pulling Jig 73 Base 74 Auxiliary protection plate 75 Pulling board 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 net support portion fixed to the edge portion of the opening of the frame body; A protective net supported by the net support portion and extending in an in-plane direction of the opening to close the opening; A net pulling section that is fixed to the edge of the opening of the frame body and pulls the protective net to the frame body in an out-of-plane direction perpendicular to the in-plane direction; Equipped with The net pulling unit is A flying object protection facility having a connecting member set to have a lower strength than the protective net.

2. The net pulling unit is a pulling jig fixed to the frame and protruding inwardly of the opening in the in-plane direction; The flying object protection system according to claim 1 , wherein the connecting member connects the protective net and the pulling jig in the out-of-plane direction.

3. 3. The flying object protection facility according to claim 2, wherein the strength of the connecting member is lower than the strength of the pulling jig.

4. The pulling jig is fixed to the frame body via a bolt or a welded portion, 3. The flying object protection facility according to claim 2, wherein the strength of the connecting member is lower than the fixing strength of the pulling jig to the frame body.

5. 5. The flying object protection system according to claim 1, wherein the connecting member is one of a band, a rope, and a clip.

6. The flying object protection equipment according to claim 1; Plant equipment as an object to be protected by the flying object protection equipment; A nuclear power plant having:

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