原子力施設の免震技術の開発

免震建屋の渡り配管の設計の概要

抄録

The crossover piping is installed between seismically isolated and non-isolated building; the reactor building (RB) is only isolated using seismic isolation systems whereas the turbine building (TB) is non-isolated. The crossover piping supported by both isolated and non-isolated building is calculated in consideration of large relative displacement between the two buildings. The flexible structure is required for crossover piping which allows the relative displacement. It also has to endure the seismic response of itself caused by different seismic excitations from both buildings. The seismic design for crossover piping needs evaluation considering both of the relative displacement and the seismic response. The results of shaking table tests of 1/10 scaled Main Steam (MS) piping model is used to compare the seismic response analyses of crossover piping. In this study, the seismic design methods including design inputs and load combination for the crossover piping design are summarized. In particular, the design shall conservatively consider the effect of stiffness variance of seismic isolator. Based on the discussion, the seismic design method for crossover piping is proposed.