Abstract: A vibration isolation supporting structure and a vibration isolation system that can prevent a high-frequency vibration and a low-frequency vibration generated on a floor of a building. The vibration isolation supporting structure includes a plurality of supporting portions erected facing each other in a predetermined area near a wall of a floor of a building, a supporting structure supported on the floor by the supporting portions, and a fixing device configured to fix the supporting structure to the floor, and when receiving a release command, the fixing device releases fixing of the supporting structure to the floor.

Abstract: An object of the invention is to provide a vibration isolation supporting structure and a vibration isolation system that can prevent a high-frequency vibration and a low-frequency vibration generated on a floor of a building. The vibration isolation supporting structure includes a plurality of supporting portions 21 erected facing each other in a predetermined area near a wall 4 of a floor 5 of a building, a supporting structure 22 supported on the floor 5 by the supporting portions 21, and a fixing device 24 configured to fix the supporting structure 22 to the floor 5, and when receiving a release command, the fixing device 24 releases fixing of the supporting structure 22 to the floor 5.

Abstract: Higher-order vibration is controlled in an event that an impact load such as an aircraft impact is applied to a nuclear plant. A higher-order vibration control device 1 is installed in a nuclear plant having a reactor containment vessel and a nuclear reactor building 3. The higher-order vibration control device 1 includes an impactor 1a, a housing 1b which receives the reaction force of the impactor 1a, and a locking mechanism 2. The impactor 1a is installed on a floor 31 of the nuclear plant so as to roll in a horizontal direction with respect to the floor 31. The housing 1b encloses the impactor 1a and guides rolling of the impactor 1a. The locking mechanism 2 restrains rolling of the impactor 1a. In the event that a flying object may possibly impact the nuclear plant, the locking of the locking mechanism 2 is released.