Dynamic assessment of the seismic isolation infl uence for various aircraft impact loads on the CPR1000 containment

• Published in: Nuclear engineering and technology pp. 1387 - 1401
• Main Authors: Runyu Mei, Jianbo Li, Gao Lin, Xiuyun Zhu
• Format: Journal Article
• Language: English
• Published: 한국원자력학회 01.12.2018
• Subjects: 원자력공학
• ISSN: 1738-5733; 2234-358X

An aircraft impact (AI) on a nuclear power plant (NPP) is considered to be a beyond-design-basis eventthat draws considerable attention in the nuclear field. As some NPPs have already adopted the seismicisolation technology, and there are relevant standards to guide the application of this technology infuture NPPs, a new challenge is that nuclear power engineers have to determine a reasonable method forperforming AI analysis of base-isolated NPPs. Hence, dynamic influences of the seismic isolation on thevibration and structural damage characteristics of the base-isolated CPR1000 containment are studiedunder various aircraft loads. Unlike the seismic case, the impact energy of AI is directly impacting on thesuperstructure. Under the coupled influence of the seismic isolation and the various AI load, the flexibleisolation layer weakens the constraint function of the foundation on the superstructure, the results showthat the seismic isolation bearings will produce a large horizontal deformation if the AI load is largeenough, the acceleration response at the base-mat will also be significantly affected by the differenthorizontal stiffness of the isolation bearing. These concerns require consideration during the design ofthe seismic isolation system KCI Citation Count: 1