Natura Resources LLC has received FLiBE coolant salt from the U.S. Department of Energy, transferred from Oak Ridge National Laboratory via Idaho National Laboratory. The delivery took place on September 18, 2026, and is intended for the MSR-1 demonstration reactor currently under construction at Abilene Christian University in Texas.
FLiBE is a molten salt composed of lithium fluoride and beryllium fluoride, with a lithium-7 purity level of 99.99%. This exceptionally high concentration is required to minimize tritium production during reactor operation. The material is not commercially available through conventional channels: its supply depends on specific government programs, and the DOE’s competitive allocation process — launched with an August 2025 solicitation and facilitated by Idaho National Laboratory — selected Natura from a pool of eligible applicants. With the salt now physically in hand, the company has removed one of the most significant supply chain bottlenecks facing molten salt reactor development.
The historical connection is direct. The delivered salt originates from the same experiment that, between 1965 and 1969, first demonstrated the viability of liquid-fueled reactors: the Molten Salt Reactor Experiment (MSRE), operated at Oak Ridge National Laboratory for more than 13,000 hours. That program validated passive safety, high operating temperatures, and fuel flexibility. Decades later, the same salt is returning to active use in a commercial project. Jordan Robison, CEO of Natura Resources, described the delivery as “a passing of the torch between generations of American innovation.”
Natura had already been selected in August 2025 as one of ten companies admitted to the DOE’s Nuclear Reactor Pilot Program, an initiative designed to accelerate the deployment of advanced reactors in the United States. The MSR-1 is a 1 MWth reactor conceived as a demonstrator: the data it generates will be used to validate the design for commercial-scale 100 MW models. The facility — including its physical structure — is already complete. With FLiBE now secured, the path to reactor criticality can proceed without interruption.
Natura’s molten salt reactors operate with liquid fuel at low pressure — two features that simplify safety management compared to pressurized water reactors. The company’s stated goals go beyond electricity generation: the technology is also aimed at producing medical isotopes and potable water, applications that broaden the potential market considerably. If the MSR-1 achieves criticality on schedule, Natura Resources could become one of the first operators to bring a Generation IV reactor to commercial deployment on U.S. soil, marking a tangible transition from research to industrial-scale advanced nuclear energy production.
