Dynamic behaviour of nuclear island structure of AP1000 under El Centro and Dien Bien earthquakes

Vu Lam Dong1, Pham Ngoc Dong2, Nguyen Dinh Kien1, Nguyen Dai Minh3, Do Tien Thinh3
1 Institute of Mechanics, VAST, 18 Hoang Quoc Viet, Ha Noi
2 Nuclear Training Center (NTC), 140 Nguyen Tuan, Thanh Xuan, Ha Noi
3 Institute for Building Science and Technology (IBST), 81 Tran Cung, Cau Giay, Ha Noi

Main Article Content


AP1000 is a nuclear power plant developed by Westinghouse based on an advanced passive safety feature, and it is one of selected technologies for Ninh Thuan 2 Nuclear Power Plant. The dynamic behavior of the plant under earthquakes is the most concerned in design and construction of the plant. This paper presents a seismic analysis of the AP1000 nuclear island structure by using the computational finite element software ANSYS. A 3D finite element model for the structure is developed and its dynamic response, including the time histories for displacements, velocities and accelerations, deformed configurations and von Mises stresses of the structure are obtained for America El Centro (6.9 Richter) and Vietnam Dien Bien (5.3 Richter) earthquakes. A comparison on the dynamic response of the structure under the two earthquakes is given, and the dynamic behavior of the structure under the earthquakes is discussed.

Article Details


[1] L. Tunon-Sanjur, R.S. Orr, S. Tinic, D.P. Ruiz, Finite element modeling of the AP1000 nuclear
island for seismic analyses at generic soil and rock sites, Nuclear Engineering and Design, vol. 237, pp. 1474-1485, 2007.
[2] N. Nakamura, Seismic response analysis of deeply embedded nuclear reactor buildings considering frequency-dependent soil impedance in time domain, Nuclear Engineering and Design, vol. 238, pp. 1845-1854, 2008.
[3] N. Nakamura, S. Akitab, T. Suzuki, M. Kobab, S. Nakamura, T. Nakano, Study of ultimate seismic response and fragility evaluation of nuclear power building using nonlinear three-dimensional finite element model, Nuclear Engineering and Design, vol. 240, pp. 166-180, 2010.
[4] F. Perotti, M. Domaneschi, S. De Grandis, The numerical computation of seismic fragility of base-isolated Nuclear Power Plants buildings, Nuclear Engineering and Design, vol. 262, pp. 189-200, 2013.
[5] C. Zhao, J. Chen, Numerical simulation and investigation of the base isolated NPPC building under three-directional seismic loading, Nuclear Engineering and Design, vol. 265, pp. 484-496, 2013.
[6] I. Chen, C. Zhao, Q. Xu, and C. Yuan, Seismic analysis and evaluation of the base isolation system in AP1000 NI under SSE loading, Nuclear Engineering and Design, vol. 278, pp. 117-133, 2014.
[7] I . Politopouos, I. Sergis, F. Wang, Floor response spectra of a partially embedded seismically isolated nuclear plant, Soil Dynamics and Earthquake Engineering, vol. 78, pp. 213-217, 2015.
[8] K.C. Senera, A.H. Varma, P.N. Bootha, R. Fujimoto, Seismic behavior of a containment internal structure consisting of composite SC walls, Nuclear Engineering and Design, vol. 295, pp. 804-816, 2015.
[9] Q. Xu, J. Chen, C. Zhang, J. Li, C. Zhao, Dynamic analysis of AP1000 shield building considering fluid and structure interaction effects, Nuclear Engineering and Technology, vol. 48, pp. 246-258, 2016.
[10] Inc. A., ANSYS Release 15.0 (Canonsburg, PA, USA, 2013).
[11] A.K. Chopra, Dynamics of structures, theory and applications to earthquake engineering, 4th edition, Prentice Hall, Boston, 2014.
[12] R.D. Cook, D.S. Malkus, M.E. Plesha, Concepts and applications of finite element analysis, 3rd edition, John Wiley & Sons, New York , 1989.