Analysis of the Influence of Structure–Soil–Structure Interaction on the Seismic Response for Nuclear Power Plant ASTS

After the Fukushima nuclear accident in Japan, whether structural safety of power plant (NPP) can be guaranteed under an earthquake has been wide concern. Automatic seismic trip systems (ASTS) have deployed NPPs. There are generally two units or more double on one NPP site, and vibration energy structure certainly affect its adjacent structures through soil, there is transfer conversion between structures. At present, distance reactors NPPs different reactor types 100–200 m (this referring to centers reactors, which slightly for types). In past, instruments were used ASTS setting shutdown threshold, so impact only unit was considered analysis NPPs, interaction site conditions not considered. addition, as become complex, it necessary consider another soil same earthquake. order analyze influence structure–soil–structure (SSSI), a three-dimensional refined finite element model established this paper. The soil–structure (SSI) by using viscoelastic boundary. responses positions raft foundation structure, considering SSI effect (one reactor) SSSI (two reactors), compared. revealed. It proposed that should reasonably according ASTS.