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Seismic Structural Fragility Investigation for the Zion Nuclear Power Plant, Seismic Safety Margins Research Program (Phase I)
An evaluation of the seismic capacity of the essential structures for the Zion Nuclear Power plant in Zion, Illinois, was conducted as part of the Seismic Safety Margins Research Program (SSMRP). The structures included the reactor containment building, the turbine/auxiliary building, and the crib house (intake structure). The evaluation was devoted to seismically induced failures rather than those resulting from combined Loss of Coolant Accident (LOCA) or other extreme load combinations. The seismic loads used in the investigation were based on elastic analyses. The loads for the reactor containment and turbine/auxiliary buildings were developed by Lawrence Livermore National Laboratory using time history analyses. The loads used for the crib house were the original seismic design loads developed by Sargent & Lundy. No nonlinear seismic analyses were conducted. The seismic capacity of the structures account for the actual concrete and steel material properties including the aging of the concrete. Median centered properties were used throughout the evaluation including levels of damping considered appropriate for structures close to collapse as compared to the more conservative values used for design. The inelastic effects were accounted for using ductility modified response spectrum techniques based on system ductility ratios expected for structures near collapse. Sources of both inherent randomness and uncertainties resulting from lack of knowledge or approximations in analytical modeling were considered in developing the dispersion of the structural dynamic characteristics. Coefficients of variation were developed assuming lognormal distributions for all variables.
Seismic Structural Fragility Investigation for the Zion Nuclear Power Plant, Seismic Safety Margins Research Program (Phase I)
An evaluation of the seismic capacity of the essential structures for the Zion Nuclear Power plant in Zion, Illinois, was conducted as part of the Seismic Safety Margins Research Program (SSMRP). The structures included the reactor containment building, the turbine/auxiliary building, and the crib house (intake structure). The evaluation was devoted to seismically induced failures rather than those resulting from combined Loss of Coolant Accident (LOCA) or other extreme load combinations. The seismic loads used in the investigation were based on elastic analyses. The loads for the reactor containment and turbine/auxiliary buildings were developed by Lawrence Livermore National Laboratory using time history analyses. The loads used for the crib house were the original seismic design loads developed by Sargent & Lundy. No nonlinear seismic analyses were conducted. The seismic capacity of the structures account for the actual concrete and steel material properties including the aging of the concrete. Median centered properties were used throughout the evaluation including levels of damping considered appropriate for structures close to collapse as compared to the more conservative values used for design. The inelastic effects were accounted for using ductility modified response spectrum techniques based on system ductility ratios expected for structures near collapse. Sources of both inherent randomness and uncertainties resulting from lack of knowledge or approximations in analytical modeling were considered in developing the dispersion of the structural dynamic characteristics. Coefficients of variation were developed assuming lognormal distributions for all variables.
Seismic Structural Fragility Investigation for the Zion Nuclear Power Plant, Seismic Safety Margins Research Program (Phase I)
D. A. Wesley (author) / P. S. Hashimoto (author)
1981
178 pages
Report
No indication
English
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