b'Advanced ManufacturingBy advancing the fundamental understanding of laser additive manufacturing, for Novel Nuclear Fuel andthis research enables novel advanced reactor designs and fuel systems via Structural Components tailored material performance and fabrication processes.T his study set out to characterize the micromechanical properties and phenomenological behavior of advanced fabricated structural steels. In particular, the effects of the laser additive manufacturing process on the microstructure, residual stress and tensile properties, and the changes induced from varying thermal annealing treatments was evaluated. It was observed that TOTAL APPROVED AMOUNT:the as-deposited 316L specimens exhibited a higher yield strength and ultimate $1,336,150 over 3 years tensile strength when compared to specimens that underwent different annealing processes. An in-depth analysis of the deformation behavior and potential irradiation PROJECT NUMBER:tolerance of additive manufactured (AM) 316L specimens, having undergone proton 18A12-105 irradiation, was also performed. It was found that the formation of microstructure PRINCIPAL INVESTIGATOR:features unique to AM fabricated 316L specimens may serve as defect sinks and Nathan Jerred provide a level of radiation tolerance in comparison to wrought 316L specimens. Further, proton-irradiated AM-316L specimens and their performance in light water CO-INVESTIGATORS: reactor prototypic conditions were evaluated and compared to wrought-based Cheng Sun, INL materials through irradiation-assisted stress corrosion cracking (IASCC) studies.Daniel Schwen, INLMichael McMurtrey, INL It was observed that wrought alloys were more susceptible to cracking under IASCC Randall Scott, INL conditions compared to AM fabricated specimens. This effect was attributed to the hypothesis that fabrication-induced pores, acting as defect sinks, may provide a level of irradiation tolerance. The fuel of interest, a depleted uranium-zirconium alloy (dU-10%Zr) by weight percent (wt.%), was evaluated for inclusion into the additive manufacturing processes. This included using powder atomization to produce adequate feedstock materials as well as investigating different AM methodologies and geometries to facilitate the co-manufacturing of fuel and cladding materials. Different approaches were investigated to generate a fuel structure with a fabricated internal porosity. To test and evaluate the effectiveness of these methodologies, 316L stainless steel was used as a surrogate for dU-10Zr (wt.%). It was found that varying AM build parameters could lead to internal void structures that may be larger than necessary. Further, a laser modulation technique to create micro-pores in build layers exhibited promise in generating an intentional porous structure, but continued development in this area is needed.92'