b'Summary of Laser Flash Analysismeasurements on Cr-coated claddingPrincipal Investigator: Weicheng ZhongTeam Members/Collaborators: Hsin Wang, Amy Godfrey, Nathan Capps, Andrew NelsonT ransfer of heat generatedaging condition. Nuclear fuel clad-by fission within a nuclearding with superior accident tolerant reactor fuel to the coolantproperties is demanded for current governs normal operation andLWR fleets, and Cr coated Zircaloy is thermal response to possiblethe primary candidate of the coated transients. Long term service of Crcladding concepts. The impact on the coated Zircaloy in light water reac- thermal transport property from the tors (LWRs) leads to microstructureCr coating and the Laves phase layer evolution of coating and the growthmust be examined and understood. of Laves phase from the interactionThis project investigates Cr coatings of of coating and substrate. The impacttwo different deposition techniques: of such microstructure evolutionHigh Power Impulse Magnetron and the Laves phase formation onSputtering (HiPIMS) and cold spray the heat transport property weretechniques. Comparing different unknown and they are investigatedcoatings allow one to understand in this project. the effects of deposition methods on the microstructure and thermal Project Description: diffusivity property. Thermal aging The goal of this project is to investi- was performed on Cr coated Zircaloy gate the thermal transport propertyat 750C in inert environments. and to characterize the interactionThermal diffusivity was measured of the coating/substrate in Cr coatedon the as received and thermally Zircaloy system after the thermalaged samples using the laser flash Figure 1. Cross section of as-deposited a,c) HiPIMS and b,d) cold spray Cr coatings on Zircaloy36 2023|AFC ACCOMPLISHMENTS'