모델 축소법을 통한 원자로 내부 구조물의 동특성 분석 및 비교

In order to verify the seismic assessments, it is essential to identify dynamic characteristics of nuclear reactor internals. The main purpose of this research is to construct efficient finite element models by applying model reduction methods. Two models - Guyan method, CMS - were constructed. The models contain fluid elements to depict reactor coolants. Finally, we extracted the dynamic responses from modal analysis, harmonic analysis, and transient analysis. As results, dynamic characteristics were well matched with detailed FE model and analysis time and costs were reduced. That results show that the FE model applied model reduction methods is more efficient comparing with the original FE model.