- NRC completed an Environmental Assessment and issued a FONSI for Dow and X-energy's Construction Permit Application in under one year.
- Long Mott Generating Station will supply electricity and high-temperature industrial steam to Dow's Seadrift site, supporting production of over 4 billion pounds of materials annually.
- X-energy's XE-100 is an 80 MW high-temperature gas-cooled reactor using helium coolant with minimal water requirements and no cooling towers or intake structures.
- The CPA included a 1,000+ page Environmental Report with year-long field surveys, groundwater monitoring wells and 12 months of water quality data, plus engagement with state agencies.
NRC environmental assessment and FONSI
The U.S. Nuclear Regulatory Commission completed an Environmental Assessment for Dow and X‑energy's Construction Permit Application for the Long Mott project in Seadrift, Texas, concluding with a Finding of No Significant Impact after an independent review completed in under one year.
Project purpose and scope
Developed by Long Mott Energy, LLC under the U.S. Department of Energy's Advanced Reactor Demonstration Program, the Long Mott Generating Station is intended to supply electricity and high‑temperature industrial steam to Dow's UCC Seadrift Operations, supporting production of more than 4 billion pounds of materials annually and aiming to be the first grid‑scale advanced reactor serving an industrial site in North America.
Environmental and site assessment
The Construction Permit Application included a 1,000+ page Environmental Report supported by year‑long field surveys, groundwater monitoring wells with 12 months of water quality data, and engagement with Texas state agencies; site planning prioritized avoiding sensitive habitats and designing around environmental constraints rather than relying solely on mitigation.
Reactor technology and environmental footprint
X‑energy's XE‑100 is an 80 MW high‑temperature gas‑cooled reactor using helium coolant, with minimal water requirements and no cooling towers or water intake structures, which reduces potential aquatic and visual impacts compared with conventional reactor designs.
Licensing context
Extensive pre‑application engagement since 2018 aimed to establish the XE‑100's safety profile so NRC review could focus on site‑specific factors and create a more predictable, technology‑informed licensing pathway.
