Browse > Article
http://dx.doi.org/10.1016/j.net.2016.03.005

Potentiality of Using Vertical and Three-Dimensional Isolation Systems in Nuclear Structures  

Zhou, Zhiguang (Research Institute of Structural Engineering and Disaster Reduction, Tongji University)
Wong, Jenna (Lawrence Berkeley National Laboratories)
Mahin, Stephen (Department of Civil and Environmental Engineering, 777 Davis Hall, University of California)
Publication Information
Nuclear Engineering and Technology / v.48, no.5, 2016 , pp. 1237-1251 More about this Journal
Abstract
Although the horizontal component of an earthquake response can be significantly reduced through the use of conventional seismic isolators, the vertical component of excitation is still transmitted directly into the structure. Records from instrumented structures, and some recent tests and analyses have actually seen increases in vertical responses in base isolated structures under the combined effects of horizontal and vertical ground motions. This issue becomes a great concern to facilities such as a Nuclear Power Plants (NPP), with specialized equipment and machinery that is not only expensive, but critical to safe operation. As such, there is considerable interest worldwide in vertical and three-dimensional (3D) isolation systems. This paper examines several vertical and 3D isolation systems that have been proposed and their potential application to modern nuclear facilities. In particular, a series of case study analyses of a modern NPP model are performed to examine the benefits and challenges associated with 3D isolation compared with horizontal isolation. It was found that compared with the general horizontal isolators, isolators that have vertical frequencies of no more than 3 Hz can effectively reduce the vertical in-structure responses for the studied NPP model. Among the studied cases, the case that has a vertical isolation frequency of 3 Hz is the one that can keep the horizontal period of the isolators as the first period while having the most flexible vertical isolator properties. When the vertical frequency of isolators reduces to 1 Hz, the rocking effect is obvious and rocking restraining devices are necessary.
Keywords
3D Isolation Systems; Isolator; Nuclear Power Plant; Response Spectrum; Rocking Effect; Vertical Isolation;
Citations & Related Records
연도 인용수 순위
  • Reference
1 J. Wong, Z. Zhou, S. Mahin, Seismic Isolation of Nuclear Power Plants, Report No. 3002000561, Electric Power Research Institute Inc., Palo Alto, CA, 2013.
2 K. Inoue, M. Fushimi, S. Moro, M. Morishita, S. Kitamura, T. Fujita, Development of three-dimensional seismic isolation system for next generation nuclear power plant, in: Proceedings of the 13th World Conference on Earthquake Engineering, Vancouver, BC, Canada, 2004.
3 J. Suhara, R. Matsumoto, H. Torita, Y. Tsuyuki, T. Kamei, O. Takahashi, Y. Kunimatsu, H. Aida, T. Fujita, Construction of civil building using three dimensional seismic isolation system: part 2, tests for three dimensional seismic isolation system, in: Proceedings, 14th World Conference on Earthquake Engineering, Beijing, China, 2008.
4 O. Takahashi, H. Aida, J. Suhara, R. Matsumoto, Y. Tsuyuki, T. Fujita, Construction of civil building using three dimensional seismic isolation system: part 1, design of building using three dimensional seismic isolation system, in: Proceedings, 14th World Conference on Earthquake Engineering, Beijing, China, 2008.
5 M. Morishita, S. Kitamura, Y. Kamishima, Structure of 3-dimensional seismic isolated FBR plant with vertical component isolation system, in: Proceedings, 17th SMiRT, Paper #K09-2, Prague, Czech Republic, 2003.
6 S. Ogiso, K. Nakamura, M. Suzuki, S. Moro, Development of 3D seismic isolator using metallic bellows, in: Proceedings of 17th International Conference on Structural Mechanics in Reactor Technology (SMiRT 17), Prague, Czech Republic, 2003.
7 M. Morishita, S. Kitamura, S. Moro, Y. Kamishima, S. Takahiro, Study on 3-dimensional seismic isolation systemfor next generation nuclear power plant-vertical component isolation systemwith coned disk spring, Technical Report No. 620, in: Proceedings, 13th World Conference on Earthquake Engineering, Vancouver, BC, Canada, 2004.
8 J. Suhara, Research on 3D base isolation system applied to new power reactor 3D seismic isolation device with rolling seal type air spring: part 1, in: Proceedings, SMiRT 17, Paper #K09e4, Prague, Czech Republic, 2003.
9 T. Shimada, J. Suhara, K. Inoue, Three dimensional seismic isolation system for next-generation nuclear power plant with rolling seal type air spring and hydraulic rocking suppression system, in: ASME, Proceedings, Pressure Vessels and Piping Conference, Denver, CO, 2005.
10 T. Somaki, T. Nakatogawa, A. Miyamoto, K. Sugiyama, Y. Oyobe, K. Tamachi, Development of 3-dimensional base isolation system for nuclear power plants, in: Proceedings of 16th International Conference on Structural Mechanics in Reactor Technology (SMiRT 16), Washington DC, 2001.
11 S. Okamura, S. Kitamura, K. Takahashi, T. Somaki, Experimental study on vertical component isolation system, in: Proceedings of 18th International Conference on Structural Mechanics in Reactor Technology (SMiRT18), Beijing, China, 2005.
12 J.M. Kelly, Base Isolation in Japan, Report No. UCB/EERC-88/20, University of California, Berkeley, CA, 1988.
13 I.D. Aiken, J.M. Kelly, F.F. Tajirian, Mechanics of Low Shape Factor Elastomeric Seismic Isolation Bearings, Report No. UCB/EERC-89/13, University of California, Berkeley, CA, 1989.
14 F.F. Tajirian, J.M. Kelly, I.D. Aiken, W. Veljovich, Elastomeric bearings for three-dimensional seismic isolation", in: Proceedings of the 1990 ASME PVP Conference, Nashville, TN, 1990.
15 S. Okamura, Y. Kamishima, K. Negishi, Y. Sakamoto, S. Kitamura, S. Kotake, Seismic isolation design for JSFR, J. Nucl. Sci. Technol. 48 (2011) 688-692.   DOI
16 International Atomic Energy Agency (IAEA), Verification of Analysis Methods for Predicting the Behavior of Seismically Isolated Nuclear Structures, Final Report of a Coordinated Research Project 1996-1999, IAEA-TECDOC-1288, IAEA, Vienna, Austria, 2002.
17 G.P. Warn, A.S. Whittaker, M.C. Constantinou, Vertical stiffness of elastomeric and lead-rubber seismic isolation bearings, J. Struct. Eng. 133 (2007) 1227-1236.   DOI
18 F. Naeim, J.M. Kelly, Design of Seismic Isolated Structures: From Theory to Practice, John Wiley and Sons Inc., Chichester, UK, 1999.
19 J.M. Kelly, E. Quiroz, Testing and Evaluation of CEGB Isolation System, Report No. 90-004, Earthquake Engineering Research Center, University of California, Berkeley, CA, 1990.
20 N. Makris, H.S. Deoskar, Prediction of observed response of base-isolated structure, J. Struct. Eng. 122 (1996) 485-493.   DOI
21 M. Kageyama, T. Iba, K. Umeki, T. Somaki, S. Moro, Development of three-dimensional base isolation system with cable reinforcing air spring, in: Proceedings, 17th SMiRT, Paper #K09-5, Prague, Czech Republic, 2003.
22 T. Fujita, S. Fujita, Y. Watanabe, A. Kato, S. Suzuki, K. Fukumori, Fundamental study of three-dimensional seismic isolation system for nuclear power plants, in: Proceedings, 11th World Conference on Earthquake Engineering, Acapulco, Mexico, 1996.
23 A. Kashiwazaki, T. Shimada, T. Fujiwaka, S. Moro, Study on 3-dimensional base isolation system applying to new type power plant reactor (hydraulic 3-dimensional base isolation system: no.1), in: Proceedings, 17th SMiRT, Paper #K09-2, Prague, Czech Republic, 2003.