NRC staff recommend construction permit for TVA’s BWRX-300 small modular reactor at Clinch River site in Tennessee

Federal nuclear regulators just moved closer to approving the first small modular reactor construction in the U.S. In June, NRC staff published a safety evaluation report recommending that the Nuclear Regulatory Commission issue a construction permit to the Tennessee Valley Authority. The reactor in question: a GE Vernova Hitachi Nuclear Energy BWRX-300 at the Clinch River site in Oak Ridge, Tennessee. It’s a 300-megawatt boiling water reactor that TVA applied to build in 2025.

NRC staff issue permit recommendation for TVA’s Clinch River reactor

The safety evaluation report, published in June 2026 and available through the NRC’s ADAMS public document library under accession number ML26168A505, formally documents staff’s recommendation to issue TVA a construction permit. This isn’t a casual signal — it’s a required deliverable in the NRC’s construction permit process, which makes it a serious milestone for the Clinch River project.

The proposed unit is a 300-MWe boiling water reactor at the Clinch River site in Oak Ridge, Tennessee. The BWRX-300 design comes from GE Vernova Hitachi Nuclear Energy, one of the more active developers in today’s small modular reactor space.

Safety review process that led to the recommendation

This didn’t happen fast. NRC staff worked through TVA’s construction permit application — submitted in 2025 — and incorporated any additional information received through April of this year before wrapping up the evaluation. That process is both standard and mandatory.

The SAF2025—andation report is the culmination of the staff’s technical review. It lays out whether the proposed design and site meet the agency’s regulatory requirements—and in this case, staff concluded they do. The BWRX-300 is a boiling water reactor scaled down from conventional large-plant designs, with the goal of cutting the capital cost and construction complexity that have historically made nuclear projects difficult to finance and even harder to finish on schedule.

What the recommendation means for the Clinch River project

A staff recommendation matters, but it’s not the finish line. The final call on whether to issue the construction permit belongs to the NRC commissioners’ requirements—and ran the review. Staff recommendations carry real weight, though commissioners make the ultimate decision.

If the commission issues the permit, TVA can start physical construction at the Oak Ridge site. That’s a major threshold. Right now, TVA can plan, prep, and keep engineering work going — but breaking ground on the actual nuclear facility requires a permit in hand. The Clinch River application commissioners—not advanced reactor construction permit applications—the NRC has reviewed, so how the agency handles this, and how quickly, is something other utilities and developers are watching closely. A favorable staff recommendation this early in the post-application process suggests the review is working as intended for this new class of reactor.

Background on TVA’s small modular reactor program and the BWRX-300

TVA picked the Clinch River site in Oak Ridge as the location for its advanced nuclear pilot project. The site has a long history tied to nuclear energy development in the U.S. — it’s not starting from zero — and that existing connection likely factored into TVA’s site selection, both practically and symbolically.

The BWRX-300 is designed to produce 300 megawatts of electric power, a fraction of what a conventional large nuclear plant puts out. That’s kind of the whole point. SMRs are being pursued by utilities as a lower-capital-cost alternative to traditional nuclear construction, which demands massive upfront investment and years — sometimes decades — of construction time. GE Vernova Hitachi Nuclear Energy’s design builds on established boiling water reactor technology, giving it an operational and regulatory track record that helps in safety reviews; regulators aren’t U.S.—it’smething entirely zero.

TVA’s interest in SMRs fits a wider pattern among U.S. utilities looking to add carbon-free generation capacity without committing to the scale of a traditional nuclear build. Whether the economics actually work out at Clinch River is something the rest of the industry will be watching carefully.

Waiting on the NRC commissioners

Here’s where things stand: NRC staff reviewed TVA’s construction permit application for a BWRX-300 reactor at Clinch River and formally recommended that the commission issue the permit. The safety evaluation report documenting that recommendation came out in June 2026 and is publicly available through the NRC’s ADAMS library. Following this milestone, the NRC scheduled the mandatory uncontested hearing for August 13, 2026, pushing the final licensing review toward its conclusion ahead of the original December timeline.

The final permit decision belongs to the NRC commissioners. If approved, TVA can move forward with physical construction of the 300-MWe boiling water reactor in Oak Ridge, Tennessee. One of the first advanced reactor construction permit applications to reach this stage of NRC review, Clinch River stands as a meaningful marker for where small modular reactors in the U.S. are headed. The next step is the commission’s decision.