X-energy Submits Xe-100 Reactor Design for UK Regulatory Assessment

X-energy has formally submitted its Xe-100 high-temperature gas-cooled reactor (HTGR) for the United Kingdom’s Generic Design Assessment (GDA) process. This regulatory step allows the Office for Nuclear Regulation and the Environment Agency to evaluate the safety, security, and environmental impact of the reactor design for potential deployment within the country.

The GDA process serves as a standard regulatory pathway for nuclear technology developers seeking to operate in the UK. By entering this assessment, X-energy provides technical documentation and design specifications for independent review by government regulators. The Xe-100 reactor utilizes TRISO particle fuel and operates at high temperatures, a design intended to provide both electricity and process heat for industrial applications. The submission marks the beginning of a multi-stage technical evaluation that determines whether the reactor meets the UK’s regulatory standards for nuclear power generation.

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Date: June 2, 2026

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GOAI