Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Dynamic assessment of the seismic isolation influence for various aircraft impact loads on the CPR1000 containment

  • Mei, Runyu (State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology) ;
  • Li, Jianbo (State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology) ;
  • Lin, Gao (State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology) ;
  • Zhu, Xiuyun (Plant Site and Civil Engineering Department, Nuclear and Radiation Safety Center, Ministry of Environmental Protection of PRC)
  • Received : 2018.04.25
  • Accepted : 2018.08.04
  • Published : 2018.12.25
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Abstract

An aircraft impact (AI) on a nuclear power plant (NPP) is considered to be a beyond-design-basis event that draws considerable attention in the nuclear field. As some NPPs have already adopted the seismic isolation technology, and there are relevant standards to guide the application of this technology in future NPPs, a new challenge is that nuclear power engineers have to determine a reasonable method for performing AI analysis of base-isolated NPPs. Hence, dynamic influences of the seismic isolation on the vibration and structural damage characteristics of the base-isolated CPR1000 containment are studied under various aircraft loads. Unlike the seismic case, the impact energy of AI is directly impacting on the superstructure. Under the coupled influence of the seismic isolation and the various AI load, the flexible isolation layer weakens the constraint function of the foundation on the superstructure, the results show that the seismic isolation bearings will produce a large horizontal deformation if the AI load is large enough, the acceleration response at the base-mat will also be significantly affected by the different horizontal stiffness of the isolation bearing. These concerns require consideration during the design of the seismic isolation system.

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