NE Seminar: Understanding Uranium Hexafluoride (UF6) Chemistry for Nuclear Safeguards and Security

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Abstract

Uranium isotope enrichment plays a critical role in the modern nuclear fuel cycle and weapons production. Uranium enrichment can be achieved through several methods (e.g., gas diffusion, gas centrifuge, and laser separation), all of which utilize uranium hexafluoride (UF6) as the primary material feedstock.

Despite its ubiquitous use, the chemistry governing common chemical reactions with UF6 is poorly resolved. Of particular interest is the hydrolysis of UF6, which is rapid and spontaneous at room temperature. Despite numerous investigations occurring at accident sites, in the laboratory, and by simulation, there is still much debate in the literature over the mechanism behind UF6 hydrolysis. Recent data collected at SRNL by cryogenically trapping intermediate compounds has provided new insight into the mechanism behind this important reaction.

Bio

Louis McNamara, Ph.D.

Senior Scientist
Savannah River National Lab

Dr. Louis McNamara is a senior scientist in the nuclear detection and forensics group at the Global Security Directorate at Savannah River National Laboratory. He has extensive experience with laser spectroscopy methods. He has 30 peer-reviewed publications in the fields of laser spectroscopy, physical chemistry, and solar materials. Dr. McNamara has previously worked on nuclear safeguards projects, including work for Defense Nuclear Nonproliferation, investigating the fundamental chemistry behind UF6 reactions, and has worked on method development for new techniques to measure uranium enrichment in UF6 gas.