Evaluation of mechanical characteristic design models for vibro-packed fuel (2)

not registered; Onuki, Norihiko*; not registered; not registered

This study has been carried out as a link in the research and development of FBR vibro-packed fuel that fuel particles are compacted directly in the fuel cladding. The calculation program code for vibro-packed fuel design has been developed to analyze of the fuel thermal/mechanical performances. In last year, we investigated material design property equations for vibro-packed fuel by the distinct element method (PFC program code). In this year, considering the vibro-packed fuel pin has variable fuel particle packing conditions, we researched fuel mechanical properties using variable particle packing density and particle size distributions. Mechanical property analyses were carried out at the condition of load cycle and simulated fuel pin conditions, too. In the analysis, the particle packing density was set up approximately 50%70%, and particle size distribution was set up 0m200m. The hysteresis loop of stress - strain was investigated in the analysis of load cycle, and simulated fuel pin with center hole was investigated, too. Vibro-packed fuel's material design property equations (Effect Young's modulus, Effect Poisson's ratio) were proposed based on the above mentioned analysis results.