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The effect of long period ground motions on structure seismic responses has become an important consideration because
of the increasing number of long-period buildings such as base-isolated structures and high-rise buildings. As a reliable
anti-seismic technology, base isolation is used in many research programs to minimize seismic response of nuclear power
plants (NPPs), which are a kind of critical constructions and any damage of them could lead to severe disasters. However,
long period ground motion effects on isolated structures are not considered in these researches. In this paper, a representative
multi-particle model of NPPs is built and lead-rubber bearing is considered as isolation system. Several classic long period
and ordinary ground motions are chosen to investigate their characteristics of time domain and frequency domain, and the
comparison analysis well explain the response differences of isolated NPPs under long period ground motions and ordinary
ground motions. According to the comparison of acceleration responses, displacement responses and shear force responses of
these two kinds earthquake, time-domain analysis is carried out using the NPPs model with and without isolation system. It
is observed that seismic responses of superstructures could be reduced more effectively under ordinary ground motions than
with long period motions input, and isolation layer displacements are larger with long period ground motions action. Seismic
safety of nuclear power plants could be enhanced effectively by isolation system, and influences of long period ground motions
on it should be considered carefully in further isolation design
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