Abstract
Calculated variations in dynamic characteristics and seismic response of nuclear power plant structures caused by different modeling assumptions are quantified. Four different mathematical models were created to describe the same structure, the Zion nuclear power station auxiliary/fuel-handling/diesel-generator complex. The modeling idealizations are a detailed finite element model, a detailed finite element model with masses lumped at selected nodes, a detailed finite element model with the constraint of rigid floors, and an equivalent beam model. Dynamic characteristics and response quantities are determined for the models and compared. Results indicate that large variations in dynamic characteristics and response can be introduced by modeling assumptions when a need exists to reduce the number of dynamic degrees of freedom.
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