| Abstract Scope |
Next-generation nuclear systems demand structural and cladding materials capable of withstanding unprecedented combinations of stressors, including high temperatures, intense radiation fields, corrosive coolants, mechanical loading, and transient operational conditions. While individual degradation mechanisms have been widely studied, true materials performance is governed by the interactions among multiple environments. To address these challenges, U.S. Nuclear Science User Facilities (NSUF) offer integrated testing platforms that enable coupled irradiation, thermal, mechanical, and chemical exposure within controlled experimental campaigns. By combining irradiation with corrosion, thermomechanical loading, and real-time microstructural diagnostics, coupled-environment testing provides a more representative understanding of material degradation pathways and performance limits. These multimodal experimental approaches are further strengthened by AI/ML-driven data analytics. Case studies demonstrate how coupling environments significantly reduces development timelines and enables rapid down-selection of promising structural materials. Together, these capabilities position NSUF as essential infrastructure for accelerating deployment and qualification of next-generation nuclear materials. |