지진 및 냉각재 상실 사고시 핵연료집합체 하단 고정체 응력해석

The bottom nozzle is one of the fuel assembly components. It has provisions for seating and locating the bottom end of fuel assembly on the lower core support structure of reactor and must maintain the structural integrity and transmit the axial and lateral loads at the bottom of fuel assembly to the lower core support structure during seismic and LOCA events. In this paper, one dimensional model and a finite element model for stress analysis of fuel assembly bottom nozzle under seismic and LOCA loading are described and the results of stress analysis are presented.