2017 | AFC ACCOMPLISHMENTS 81 Figure 2. Comparison of normalized reactor power in a $1.05 RIA at HFP. the assessment are initial screening analyses, three-dimensional core analyses, and reactor system analyses. The integrated analytical approach starts with an initial screening using infinite lattice physics calculations. Three-dimensional core analyses then provide fuel cycle performance data and reactor kinetics param- eters for time-dependent accident analysis. Reactor system analyses finally provide estimates of safety margins and “coping time”, i.e., time to various limiting/failure conditions, under various transient accident scenarios.The search for attractive and viable advanced fuels/ ATF candidates requires consideration of a broad spectrum of potential fuel and cladding options. Evaluation of the performance of these fuel and cladding options is vitally impor- tant, because it identifies whether the options have at least equivalent performance to the present UO2-Zr fuel-cladding system under nominal conditions and improved performance in accident scenarios. Both of these characteristics are necessary in order for any ATF concept to be adopted by industry and utilities.