UTSA to lead multimillion-dollar project to advance interplanetary space exploration

The project is entitled, "Experimental and Computational assessment of thermodynamic stability of fission products in advanced reactor fuels." UTSA will collaborate with the University of Texas at El Paso (UT El Paso) and Idaho National Laboratory (INL), a leading DOE NE national laboratory, to investigate fission product (FP) behavior in advanced reactor fuels.

Fission products (FPs) are particles that remain after nuclear fission, the process that occurs when a nucleus is split into two smaller nuclei to generate energy. This project will utilize experimental and computational methods to investigate FPs and their influence on the thermal and mechanical properties of advanced reactor fuels, specifically uranium mononitride (UN).

UN is a chemical compound that refers to an oxidation state where nitrogen binds to the fissile fuel-uranium. UN is known for its high uranium density as well as high thermal conductivity which results in more efficient power production and heat transfer.

Uranium nitrides are seen by the nuclear materials community as exciting candidate fuels for advanced nuclear systems, including space nuclear propulsion and advanced civilian power systems.

"Nuclear reactor developers all over the U.S. are proposing designs for safer, more economical, proliferation resistance systems," added Sooby. "Many of these new technologies necessitate the use of nuclear fuels which are not yet on the market. Further, with the push to go to Mars, there's a great deal of attention being placed on space nuclear power systems to both power habitats and space craft."

Sooby has spent 15 years of her scholarly career dedicated to the materials science investigations of emerging materials for energy technologies. Since arriving at UTSA in 2017, Sooby has built and leads the Extreme Environments Materials Laboratory, which is bridging data gaps and advancing the fundamental understanding of uranium-bearing compounds that can be used as fuel forms for nuclear reactors.

This laboratory includes equipment that can synthesize, characterize and test these compounds safely under reactor-relevant conditions that encompass both normal operation and accident scenarios.

Sooby's collaborators include Xochitl Lopez-Lozano and Patrick Warren, associate professor and assistant professor of research, respectively, in the university's physics and astronomy department; Eunja Kim and Mark Pederson, professors in the Department of Physics at UT El Paso; Tiankai Yao, a staff scientist at the Characterization & Advanced PIE division of Materials and Fuel Complex at Idaho National Laboratory; and Mira Khair, a postdoctoral fellow in the UTSA Department of Physics and Astronomy. Additionally, the team will recruit two UTSA graduate students and over 15 undergraduates to assist with the project.