2018 | AFC ACCOMPLISHMENTS 70 nominal conditions and improved performance in accident scenarios. Both of these characteristics are necessary in order for anyATF concept to be adopted by industry and utilities. Accomplishments: The main activities in FY18 included: 1) aWhite Paper assessing the ability to calculate “coping time”, and 2) continued assessment of advanced fuel concepts for LWRs. TheWhite Paper “Assessment of Ability to DetermineTime Available to Recover from Accidents for ATF LWR Fuel Concepts (i.e., “Coping Time”)” was prepared including input from Oak Ridge National Laboratory (ORNL), Massachusetts Institute of Technology (MIT), Idaho National Laboratory (INL), and Electric Power Research Institute (EPRI). Because accident scenarios differ between reactors, and accident progression can take different paths, several definitions/ figures-of-merit for coping time and their bases are described, followed by a brief description of potential accident scenarios to be considered.The phenomena that need to be modelled, and the computational tools available to perform the analyses are described. Tools utilized by industry are identified, but the assessment of capabilities is focused on tools utilized by the national laboratories; namely,TRACE, TRACE-BISON, and MELCOR.The data needed to “accurately” model ATF concepts in the simulation of the initial conditions (i.e., the condition of the reactor at the initiation of the accident) and the evolution of the accident are also described. Several options for coating fuel pellets to mitigate the fuel/coolant interactions for water-reactive high-density Figure 2. Core-wide Maximum Equivalent Clad Reacted (ECR)-FeCrAl Cladding.