High cycle fatigue damage analysis of KALIMER UIS bottom plate

The KALIMER Upper Internal Structure(UIS) bottom region is subjected to a high cycle thermal striping load during steady state operation due to the mixing of the sodium jets from different core assemblies with various velocities and temperatures. In this paper, a simple procedure for UIS striping analysis was proposed and the Inconel 718 liner plate was introduced to protect the UIS bottom plate from severe thermal striping load. The proposed simple procedure for the calculation of high cycle fatigue damage has been confirmed reasonably by an axisymmetric analysis of the UIS bottom structure. The analysis results of this study indicated that the conceptually designed UIS by attaching the Inconel 718 liner plate under the UIS bottom plate could be protected against severe thermal striping load by attaching