안전정지지진 조건에서 소듐냉각고속로 핵연료 집합체의 Lifting-off 해석

The Korea Atomic Energy Research Institute(KAERI) has been developing Sodium-cooled Fast Reactor(SFR). The stability of the fuel assembly of SFR, supported on the grid plate and held position by self weight. Top of fuel assembly has free boundary conditions. Hence, there is a concern of lifting off during SSE(Safe Shutdown Earthquake). Therefore, it is necessary to carry out the evaluation of the lifting-off of fuel assembly under vertical acceleration in consideration of the SSE.