Study on seismic analysis method of fast reactor plant with seismic isolation system; Analysis model of seismic isolation system and influence on buckling evaluation of reactor vessel

Okamura, Shigeki*; Kinoshita, Takahiro*; Nishino, Hiroyuki  ; Yamano, Hidemasa   ; Kurisaka, Kenichi ; Futagami, Satoshi  ; Fukasawa, Tsuyoshi*

A Sodium-Cooled Fast Reactor (SFR) has thin-walled structures compared to the LWRs, because its thermal stress due to elevated temperature is much higher and its internal pressure is much lower than that of the LWRs. A seismic isolation system is employed to reduce the seismic force, because the thin-walled structure is strongly affected by severe earthquakes. The thicker laminated rubber bearings are adopted for SFR. The laminated rubber bearing with thickness rubber is adopted for SFR. The characteristic of the laminated rubber bearing has been grasped by the static test with 1/2scale model. The analysis model, which improved non-linear characteristic, has suggested. On the other hand, the earthquake PRA has carried out in the seismic isolation plant of SFR. In this study, the seismic response analysis with the improved analysis model was carried out. The acceleration response in the floor response spectrum was grasped. The damage probability of the reactor with the non-linear characteristic of the laminated rubber bearing is improved.