Development of the 3D finite element model for dynamic analysis of the Ignalina nuclear power plant reactor building

Abstract

Development of the 3D finite element model for the dynamic analysis of the Ignalina NPP unit 2 reactor building is considered. The model comprises description of the monolithic structures, while prefabricated frame structures are removed and replaced by additional stiffness and masses. Discretisation of equipment in a form of applied masses is discussed in details. The 3D model has been used for global dynamic analysis, where evaluation of frequencies and in-structure response spectra is considered in details. Sensitivity study with respect of increased and reduced by 20% masses of removed structures, is also presented.