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

Federal nuclear regulators just moved closer to approving the first small modular reactor construction in the United States. In June 2026, NRC staff published a safety evaluation report formally recommending that the Nuclear Regulatory Commission issue a construction permit to the Tennessee Valley Authority for a BWRX-300 boiling water reactor at the Clinch River site in Oak Ridge, Tennessee—the first advanced reactor construction permit application of its kind to reach this stage of NRC review.

NRC staff issue formal permit recommendation for Clinch River reactor

The safety evaluation report is publicly available through the NRC’s ADAMS document library under accession number ML26168A505. That’s not just a bureaucratic footnote — it means this recommendation is fully on the record and part of the formal licensing process. This isn’t an informal signal or a preliminary opinion. It’s a required deliverable in the NRC’s construction permit process, which makes it a genuine milestone.

The proposed unit is a 300-MWe boiling water reactor designed by GE Vernova Hitachi Nuclear Energy. The BWRX-300 is one of the more active designs in today’s small modular reactor space, and TVA’s application — submitted in 2025 — is among the first of its kind to reach this point in NRC review.

The safety evaluation report is the result of that technical review, laying out whether the proposed design and site meet the agency’s regulatory requirements.

How the safety review process led to the recommendation

This didn’t happen overnight. NRC staff worked through TVA’s construction permit application and incorporated additional information received through April 2026 before finishing the evaluation—a process that’s both standard and mandatory, with no shortcut available.

The safety evaluation report is the result of that technical review, laying out whether the proposed design and site meet the agency’s regulatory requirements. In this case, staff concluded they do.

The BWRX-300’s design helped move things along. It builds on established boiling water reactor technology, so regulators weren’t evaluating something entirely unfamiliar. That existing track record—operational and regulatory both—gives staff a foundation to work from when assessing how the reactor behaves or what risks it presents. They’re not starting from zero.

What the recommendation means for TVA and the Clinch River project

A staff recommendation carries real weight, but it’s not the finish line. The final decision on whether to issue the construction permit belongs to the NRC commissioners—not the staff who conducted the review. That distinction matters.

If the commission issues the permit, TVA can begin physical construction at the Oak Ridge site. Right now, TVA can plan, prepare, and advance engineering work, but breaking ground on the actual nuclear facility requires a permit in hand. That’s a significant threshold.

The timeline is also moving faster than expected — the NRC has scheduled the mandatory uncontested hearing for August 13, 2026, pushing the final licensing review well ahead of what had been an original December timeline.

Other utilities and developers are watching closely. Clinch River is among the first advanced reactor construction permit applications to reach this stage of NRC review, and how the agency handles it sets a precedent for the broader SMR industry. A favorable staff recommendation this early in the post-application process suggests the review framework is functioning as intended for this new class of reactor.

Background on TVA’s SMR program and the BWRX-300 design

TVA selected the Clinch River site in Oak Ridge partly because of its existing history with U.S. nuclear energy development. The site carries both practical advantages and symbolic weight, and that connection likely factored into TVA’s decision.

The BWRX-300 is designed to produce 300 megawatts of electric power — a fraction of what a conventional large nuclear plant outputs. That’s intentional. U.S. utilities are pursuing SMRs as a lower-capital-cost alternative to traditional nuclear construction, which demands massive upfront investment and years, sometimes decades, of build time.

GE Vernova Hitachi Nuclear Energy’s design scales down from conventional large-plant configurations to cut the financial and logistical barriers that have historically made nuclear projects difficult to finance and even harder to complete on schedule. Whether that approach actually delivers on its promise is something the industry will be watching carefully as Clinch River moves forward.

TVA’s interest in SMRs reflects a broader push among U.S. utilities to add carbon-free generation capacity without committing to the scale of a traditional nuclear build.

Where things stand now

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 was published in June 2026 and is publicly accessible through the NRC’s ADAMS library under accession number ML26168A505.

The mandatory uncontested hearing is now scheduled for August 13, 2026, ahead of the original December timeline. Final permit authority rests with the NRC commissioners.

If approved, TVA can move forward with physical construction of the 300-MWe boiling water reactor in Oak Ridge, Tennessee. As one of the first advanced reactor construction permit applications to reach this stage, Clinch River represents a concrete marker for where small modular reactors in the U.S. currently stand. The next step is the commission’s call.

Kelly Lippke

Kelly is an experienced writer with 15 years of experience exploring the big stories that shape our world, from tech breakthroughs and space exploration to climate, energy, and the fascinating quirks of science. She has a talent for turning complex ideas into sharp, memorable insights that stay with readers long after they’ve finished reading.