Engineering the future of nuclear materials
High-performance materials are the foundation of next-generation nuclear technologies, from advanced reactors to fusion energy systems. However, before new materials can be deployed, they must be qualified through rigorous irradiation testing to meet demanding safety and performance standards.
ORNL’s Irradiation Engineering group addresses this critical challenge by integrating cutting-edge experiments, advanced fabrication, and meticulous safety practices.
Experiment design that drives innovation
The Irradiation Engineering group specializes in designing and executing sophisticated irradiation experiments at ORNL’s High Flux Isotope Reactor, leveraging a suite of modeling and experimental methods to precisely understand and predict how nuclear materials perform under varying reactor conditions.
Core technical capabilities include:
- Advanced neutronics analysis, accurate simulations of neutron interactions with materials under irradiation.
- Finite element analysis, enabling precise predictions of thermal, mechanical, and structural responses in reactor conditions.
- Engineering-scale irradiation experiments, providing real-world data critical for material qualification and validation.
The team also actively integrates innovative fabrication methods—such as additive manufacturing and advanced joining techniques—to enhance the performance, customization, and safety of experimental components. These approaches allow the group to rapidly develop the reliable, high-performance materials and technologies essential for advanced nuclear programs.
Bridging research and real-world applications
The team bridges fundamental nuclear science research and practical nuclear technology deployment through close collaboration with academic institutions, industry partners, and other national laboratories.
Key areas of collaboration include:
- The Advanced Reactor Demonstration Program, enabling rapid deployment and qualification of novel reactor designs and materials.
- Advanced Fuel Campaign research efforts, designed to safely withstand more intense reactor conditions, resulting in enhanced fuel performance for existing and advanced nuclear reactor technologies.
- Fusion reactor material research, helping overcome critical materials challenges for future fusion energy systems.
- DOE-supported isotope production, including plutonium-238 for space exploration missions requiring reliable, long-term power sources, as well as selenium-75, nickel-63, and cobalt-60.
The group also offers specialized engineering and operational support for HFIR, continually ensuring reactor reliability, developing new irradiation capabilities, and supporting the lifecycle extension of this vital user facility.
Recent advances in irradiation engineering
Additively manufactured reactor components
Successfully designed, 3-D printed, and irradiated the first stainless-steel specimen capsule ("rabbit capsule") in HFIR, demonstrating additive manufacturing’s potential for efficient, customized production of specialized reactor components.
ROADRUNNER MiniFuel experiment
Deployed the MiniFuel irradiation platform in HFIR to rapidly qualify high-density uranium nitride fuels, directly addressing important performance questions for advanced nuclear reactor designs.
Space nuclear support
Enabled key advancements in space exploration by supporting the In-Pile Steady State Extreme Temperature Testbed (INSET) for testing nuclear fuels and components under space-relevant conditions. Also redesigned and qualified a unified Pu-238 production target compatible with both HFIR and ATR reactors, securing NASA’s domestic radioisotope fuel supply.
Toward advanced irradiation capabilities
Looking ahead, the Irradiation Engineering group aims to establish fast-spectrum irradiation capabilities at HFIR, standardize platforms for molten salt and metallic materials research, and expand in-situ measurement techniques. By rigorously stewarding irradiation facilities, managing high-quality experimental data, and maintaining close collaborations with industry and academia, the team is laying the essential groundwork for advanced nuclear technologies.