X-energy says the US Nuclear Regulatory Commission has completed its safety review for the first deployment of its Xe-100 high-temperature gas-cooled reactor. The company announced the milestone on 30 October for the proposed Long Mott Generating Station being developed with Dow.
The final safety evaluation follows examination of the preliminary design, safety analyses and associated research programmes. X-energy says the Advisory Committee on Reactor Safeguards separately reviewed the staff evaluation and supports issuance of a construction permit.
The safety review follows completion of the environmental review in May 2026. Together they move the project into the final stages of the construction-permit review; the announcement does not say that the permit itself has been issued.
The distinction matters for the supply chain: a completed technical review advances licensing but is not an authorisation to operate a reactor. The proposed industrial deployment is supported through the Department of Energy’s Advanced Reactor Demonstration Program.
Source: Announcement dated 30 October 2026.
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Illustrative technology file photograph: TRISO fuel research at Oak Ridge National Laboratory, 6 April 2020. This does not show X-energy personnel, Long Mott or the NRC review. Photo: Oak Ridge National Laboratory / Wikimedia Commons, CC BY 2.0. Resized and compressed.
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