Soil Structure Interaction Analysis of Diesel Oil Storage Tank in a Nuclear Power Plant

摘要

Following the nuclear power plant accident in Fukushima Japan, seismic capacity evaluation has become a crucial issue in combination building safety. Diesel oil storage tanks (DOSTs) are designed to provide fuel to generators whenever offsite power is lost. A DOST is defined as a seismic class I structure, playing the important role of providing the fuel oil required to maintain uninterrupted operations for seven days at a rated load. According to the latest nuclear safety requirements, soil structure interaction (SSI) must be considered in all seismic analyses. This study aims to rebuild the computer model of DOSTs in Taiwan using the SAP2000 program in conjunction with the lumped mass stick model and to evaluate the SSI by employing the SASSI 2000 program. The differences between the results with the SSI and fixed-end model are compared via natural frequency and response spectrum curves. This computer model enables engineers to rapidly evaluate the safety margin of DOST following the occurrence of earthquakes or tsunamis.