Seismic design

Iigaki, Kazuhiko ; Hanawa, Satoshi 

The high temperature engineering test reactor (HTTR) was constructed on a sand layer formed during the Quaternary era. A seismometry system was installed in the HTTR facility in order to performed seismic analyses using a seismic observation record. The analysis model in the design was improved so that the simulation analysis result reproduced the seismic observation record. The dynamic analysis was carried out using an improvement model in order to compare seismic forces in the design. As the result, it was confirmed that the seismic forces obtained by the improvement model was approximately more conservative than the seismic force used in the design.