b'multiphysics phenomena, and (3)specimens are exposed to an LWRFigure 1. A schematic illustration provide material property solutions toapplication-relevant environmentfor high-level structure of the SiC optimize cladding design and addressinvolving the interplay of multi- development activitiesfeasibility issues. physics phenomena. For example, These three development activitiesstress corrosion cracking testing are connected, schematically showninvestigates the combined effects of in Figure 1. The advanced fuelcorrosion and applied stress.performance capabilities will be usedAccomplishmentsto assess the cladding performance toBased on the technology gap analysis, optimize the composite microstruc- the 5-year R&D execution plan was ture and fuel rod design. Integrateddocumented by Oak Ridge National tests and material property handbookLaboratory (Figure 2). The plain is updates for the latest grade of clad- aligned with the Systematic Tech-ding are required to keep the materialnology Evaluation Program (STEP) models applicable. Integrated testsfor SiC/SiC composite-based ATF are defined as a type of test in whichcladding and core structures, which 2023|AFC ACCOMPLISHMENTS 67'