CX-020907: Measuring Mechanical Properties of Select Layers and Layer Interfaces of TRISO Particles via Micromachining and In-Microscope Tensile Testing – Idaho State University

Idaho State University, in collaboration with the Idaho National Laboratory, proposes to 1) develop a capability for sum-micrometer scale strength characterization via focused ion beam micromachining and in-situ TEM tensile testing; 2) use this capability to determine strengths across unirradiated and irradiated TRISO-coated particle layers and layer interfaces, and 3) make this testing capability available to other researchers. Particles will be used from two previous studies under the Advanced Gas Reactor (AGR) Program (AGR-1 and AGR-2), which means no new particles production or irradiation is required as part of this project. Focused Ion Beam (FIB) micromachining will be used to prepare samples from the layers and interfaces of interest to this study. The major deliverables associated with this project are (1) Analyzed results of micromachining and in-microscope tensile testing if TRISOcoated particle layers from fuel surrogate particles; (2) Analyzed results of micromachining and in-microscope tensile testing if TRISO-coated particle layers from unirradiated fueled particles; (3) Analyzed results of micromachining and in-microscope tensile testing if TRISO-coated particle layers from irradiated fueled particles; (4) At least two peer-reviewed publications summarizing micromachining and in-microscope tensile testing technique, data collected and analysis of data; (5) At least one MS completed and 1 MS or PhD in progress during the term of the project; and (6) Quarterly and annual reporting to DOE. Existing laboratory facilities and equipment will be used.