TL;DR
Prime made for students and young adults
- Fast, free delivery for dorm and study essentials
- Prime Video and Amazon Music included
- Member-only deals
The U.S. Nuclear Regulatory Commission issued the Tennessee Valley Authority a construction permit for a BWRX-300 small modular reactor at Clinch River in Oak Ridge, Tennessee. It is the first U.S. construction permit for this reactor design; the permit allows construction to proceed, but does not establish when the project will be completed or begin operating.
The U.S. Nuclear Regulatory Commission has issued the Tennessee Valley Authority a construction permit for a BWRX-300 small modular reactor at Clinch River in Oak Ridge, Tennessee. The decision, announced September 29, is the first U.S. construction permit for the reactor design and advances TVA’s proposed project toward construction.
The permit follows the NRC’s review of TVA’s application, which the utility submitted in April 2025. The project builds on an existing Early Site Permit for Clinch River. The NRC’s action authorizes construction under the permit; the announcement does not give a construction start date, project cost, or planned operating date.
GE Vernova Hitachi Nuclear Energy, which is developing the BWRX-300, said the licensing process involved engagement among TVA, the NRC and the company. The reactor is a 300-megawatt design that the company says uses a simplified configuration and draws on decades of boiling water reactor operating experience. Those design descriptions and claims about construction complexity come from the vendor.
The announcement places the permit in a wider North American licensing timeline. In April 2025, Canada’s nuclear regulator issued Ontario Power Generation a license to construct a BWRX-300 at Darlington, where construction is underway, according to GE Vernova Hitachi. OPG submitted an operating license application in March 2026, which remains under review. Separately, Blue Energy submitted the first part of an NRC construction permit application in September 2026 for a planned BWRX-300 in Texas.
A First U.S. License Milestone
The permit is a concrete regulatory step for a reactor design that has not yet been built in the United States. It gives TVA authority to move into construction of the Clinch River unit under the terms of the NRC permit, while leaving later project milestones, including completing construction and obtaining authorization to operate, ahead.
For the industry, a review completed for one project may provide experience relevant to later applications, though it does not guarantee that future projects will receive permits on the same schedule. GE Vernova Hitachi chief executive Jason Cooper said a standard design could let developers apply common technology, licensing experience and supply chain capabilities across projects. That is the company’s view of the potential fleet model, not a finding by the NRC about costs, delivery times or commercial performance.
The site also sits within the Oak Ridge nuclear ecosystem, near the Department of Energy’s Oak Ridge National Laboratory. The announcement identifies that location and institutional proximity, but does not describe a specific role for the laboratory in the TVA project.
Clinch River’s Licensing Path
TVA filed its construction permit application in April 2025, relying on an earlier Early Site Permit for Clinch River. The NRC’s review of the construction application culminated in the permit announced September 29, 2026. The source announcement describes the review as extensive but does not provide its duration by stage, detailed findings, or any conditions attached to the permit.
The BWRX-300 is a boiling water reactor design rated at 300 megawatts. GE Vernova Hitachi describes it as a small modular reactor intended to simplify construction. The construction permit milestone is distinct from an operating license: the Canadian example cited by the company also shows a separate operating application under review after a construction license was issued.
North American projects are at different stages. Construction is underway at Ontario Power Generation’s Darlington site in Canada, while the Clinch River permit is the first U.S. construction permit for the BWRX-300. Blue Energy’s Texas project is earlier in the U.S. process, with only the first part of its application submitted, according to the company announcement.
““This is a milestone for TVA and GE Vernova Hitachi Nuclear Energy, and an important moment for new nuclear in the United States.””
— Eric Gray, CEO of GE Vernova’s Power Segment
Construction and Operating Dates
The announcement does not state when TVA expects construction to begin, how long it will take, what the project will cost, or when the unit might produce electricity. It also does not detail the NRC’s permit conditions or summarize technical findings from its review.
The permit covers construction, not operation. TVA will need to reach subsequent regulatory and project milestones before the reactor can operate. The source material does not specify a schedule for those steps, and no completion date should be inferred from the permit issuance.
TVA’s Next Project Milestones
TVA can proceed with construction under the NRC permit, subject to its terms. The company announcement does not provide a start date or a schedule for subsequent milestones. Updates from TVA and the NRC will be needed to establish the project’s construction timeline and the path toward an operating authorization.
In parallel, Canada’s regulator continues reviewing Ontario Power Generation’s operating license application for the Darlington BWRX-300. Blue Energy’s Texas proposal remains at an earlier stage after submission of the first part of its U.S. application. Those proceedings will add separate licensing experience, but their outcomes and timelines remain open.
Key Questions
What did the NRC approve?
The NRC issued TVA a construction permit for a BWRX-300 reactor at Clinch River in Oak Ridge, Tennessee. The permit is not an operating license.
Why is this permit described as a first?
GE Vernova Hitachi says this is the first construction permit in the United States for a BWRX-300. It does not mean the reactor has begun operating or that it is the first small modular reactor project of any kind.
How much power is the BWRX-300 designed to produce?
GE Vernova Hitachi describes the design as a 300-megawatt small modular reactor. The cited announcement does not give a project-specific electricity generation forecast for the Clinch River unit.
When will the Clinch River reactor be completed?
The announcement gives no construction start, completion or operating date. Those details remain unclear.
Source: hn
Fall Picks
fall essentials
As an affiliate, we earn on qualifying purchases.
