[3O09-12] Reactor Design and Seismic Evaluation

[3O09] Development of Evaluation Method Taking Account of Uncertainties of Time History Seismic Input

*Takahito Kumagai¹, Tadashi Iijima², Yusuke Minakawa², Nobuyoshi Goshima³, Kyosuke Kamito³, Takuma Hadano⁴, Hiroaki Kawabata⁴, Masataka Nakajima⁴, Mitsuhiko Amemiya⁵ (1. Hitachi, 2. HGNE, 3. MHI, 4. Toshiba ESS, 5. JAPC)

Keywords:Time history analysis, Time history seismic input, Uncertainties, Scaling factor, Crane

Time history analysis has been applied instead of the spectral modal analysis to evaluate the actual seismic behavior of the equipment. In spectral modal analysis, response spectra are usually broadened in the seismic analysis of equipment to take account of the material property uncertainties. In time history analysis, ASME proposed time history broadening method that performs time history analyses by using the original wave, the 10% stretched and compressed waves to take account of conservativeness corresponding to the broadened response spectrum. This study proposed the refined ASME’s method that allows us to select the time inclement shift number and use the scaling factors. We dealt with the cranes as represetative equipment, and showed the applicability of the present method.