UT experts brief subcommittee on advanced nuclear reactors; TVA Clinch River project highlighted

The Business & Utilities Subcommittee received a briefing on advanced nuclear reactor technology and Tennessee's role in the sector, including small modular reactors (SMRs), molten-salt designs and related workforce and economic developments.

Wes Hines, who described himself as affiliated with the University of Tennessee nuclear engineering department, provided an overview of current U.S. nuclear capacity and the attributes of next-generation reactors. "A lot of those are what's called inherently safe or walk away safe," Hines said, describing designs that rely on physics rather than active safety systems to remove heat. He said advanced designs could have higher thermal efficiencies, modular factory construction and load-following capability that better integrates with intermittent renewables.

Why it matters

Speakers said advanced reactors could replace retired coal plants, retain local transmission infrastructure and preserve skilled jobs. Tennessee already hosts nuclear-related companies, national-lab activity and university training programs that supporters said make the state a likely hub for manufacturing and workforce development tied to new reactors.

Key points from the briefing

- Types and sizes: Speakers said SMRs are generally in the 200–300 megawatt-electric range; microreactors are smaller and targeted to remote or defense uses. Hines noted the BWX-300 as a pressurized SMR design TVA has considered.

- Coolants and efficiency: Advanced designs may use molten salt, gas or liquid metal coolants and operate at higher temperatures, increasing thermal efficiency compared with conventional light-water reactors.

- Safety and siting: Hines said some designs are placed below grade for security and have much smaller emergency planning zones; he noted that the SMR design TVA has considered would have an emergency planning zone at the site boundary rather than the 10-mile radius typical of existing large reactors.

- Industry activity in Tennessee: Witnesses named several projects and companies: Kairos (molten-salt demonstration in Oak Ridge), TerraPower and X-energy (advanced reactor projects funded by the Department of Energy), and ARANO (enrichment facilities). Hines said TVA has applied for a federal grant to help offset first-of-a-kind costs for SMR deployment and that TVA's Clinch River site has early site permits and room for multiple SMR units.

- Timeline and challenges: Speakers described first-of-a-kind costs and supply-chain establishment as major near-term challenges. Hines cited TVA's path to put a first unit online in 2032 as contingent on regulatory and manufacturing steps.

Questions from legislators covered water use, seismic and aquifer concerns, recycling used fuel and workforce training. On water and cooling, witnesses said advanced designs and higher operating temperatures could reduce overall water needs compared with conventional plants. On recycling, speakers noted global activity (France and others) in reprocessing used fuel, along with proliferation and policy considerations.

Provenance

The briefing began with committee introduction of the topic and remarks by Wes Hines and concluded when the committee resumed business; the presentation and Q&A occupied the bulk of the afternoon meeting.

Ending

Committee members expressed interest and encouraged continued state support for nuclear workforce and industrial development. No committee action or vote was taken on energy legislation at this hearing.