LIS Technologies has received uranium hexafluoride feedstock at its Oak Ridge research facility in Tennessee, enabling the next phase of work on its CRISLA-4G laser isotope separation technology. The initial shipment will support equipment commissioning, materials qualification and experiments involving the integrated demonstration loop. These activities are intended to generate operating evidence for a technology that remains under development, with commercial enrichment a later objective.
The arrival of the material follows a radioactive material licence issued by the State of Tennessee in December 2025. During the intervening period, the company assembled and integrated experimental equipment, including systems intended to work with uranium-bearing material under its authorised research programme. With the intended feedstock available, commissioning can progress beyond the preparatory checks undertaken before radioactive material is introduced.
Within the former Oak Ridge K-25 nuclear complex, the Demonstration Test Loop occupies the renovated K-1330 building, part of a site associated with earlier enrichment operations. The location provides an established industrial setting for the research, although the present equipment and development objectives differ from those of the former facilities. LIS Technologies has identified a separate Oak Ridge property for potential commercial expansion, which would require its own engineering and regulatory work.
By raising the proportion of uranium-235 in nuclear material, enrichment provides fuel with the isotopic composition required by many civilian reactor designs. Natural uranium contains several isotopes, and the required composition depends on the fuel specification before subsequent processing and fabrication. Established enrichment plants use gas centrifuges to separate isotopic material, while the CRISLA approach being investigated at Oak Ridge uses selective interactions with laser energy.
Known as Condensation Repression Isotope Selective Laser Activation, CRISLA is now being developed in its fourth generation, designated CRISLA-4G. The company’s research programme is intended to establish whether the separation effect can be reproduced in an integrated system under conditions relevant to further development. LIS Technologies has identified potential electricity and cost advantages, but comparable operating data from a commercial installation have not been established.
Uranium hexafluoride is widely used in the nuclear fuel cycle because it can be processed in gaseous form under controlled conditions, although its chemical and radiological properties demand rigorous containment, authorised material handling and accounting. Those requirements extend across the storage, transfer and experimental stages at a research facility. Appropriate equipment qualification and operating controls are therefore integral to bringing the newly delivered feedstock into the demonstration programme.
Commissioning and materials qualification will establish whether equipment and components are suitable for their intended functions before integrated experiments progress. Connected systems can behave differently from individual components operating in isolation, particularly when control, measurement and material handling functions are brought together. The demonstration loop allows engineers to assess those interactions and collect information about repeatability and equipment performance without presenting the results as a commercial production trial.
As the experimental work develops, the company intends to optimise its process and examine how the complete arrangement behaves under the permitted operating conditions. Measurements from those runs will inform subsequent engineering decisions about reliability, production capability and the requirements of more representative demonstration equipment. The initial delivery provides the material needed for that research, while the results necessary to evaluate enrichment performance are still to be reported.
Chief operating officer Lloyd Jollay has described the arrangements required to secure a shipment smaller than quantities normally handled through established uranium supply channels. Research installations often need comparatively limited volumes of specialised material, but their suppliers and operators must still meet applicable requirements for acceptance, storage and traceability. Establishing that supply route removes a practical constraint on the company’s experimental schedule.
The programme’s next stated milestone is Technology Readiness Level 5, which president and co-founder Christo Liebenberg has identified as a development objective. The technology readiness framework uses progressively more demanding evidence to assess maturity, with Level 5 associated with validation in a relevant environment. The planned experiments at Oak Ridge are intended to support that assessment, alongside the measurement and documentation needed for later engineering decisions.
Industrial enrichment would require a further demonstration of sustained equipment operation, predictable product quality and reliable maintenance arrangements. Plant availability, electricity use and capital requirements would then influence the eventual cost of production. Measurements gathered from the present research installation may inform that work, although a future pilot facility would have to establish performance at conditions more representative of commercial use.
Possible markets include conventional low-enriched uranium used by existing nuclear reactors and high-assay low-enriched uranium, known as HALEU, specified by some advanced reactor designs. The two categories have different fuel requirements, and both involve further processing after enrichment. LIS Technologies identifies these markets in its longer term plans, while the current Oak Ridge installation is dedicated to research and technology development.
In January 2026, Tennessee authorities announced the company’s separate proposal for approximately $1.38 billion of investment and 203 jobs at a future enrichment facility. The proposed site, now called LIST Island, covers 206 acres within the former K-25 industrial area. Financing, technical development and the necessary approvals remain prerequisites for that investment, independently of the licensed demonstration work in the K-1330 building.
Development of the larger facility would follow additional pilot work intended to generate production and cost evidence beyond the initial experimental programme. That sequence also provides opportunities to assess the equipment and operating requirements of a sustained industrial installation. Research into possible stable isotope applications forms part of the company’s broader technology ambitions, although the material received in October is for its uranium programme.
With the first uranium hexafluoride feedstock on site, the Oak Ridge team can continue commissioning and integrated experiments under its existing authorisation. The resulting measurements will determine which engineering assumptions can be carried into subsequent pilot planning and where further development is needed before any commercial enrichment operation can be considered.
