Lettis Consultants International, Inc. is part of the geologic and seismic hazard team working on the Clinch River Nuclear Site near Oak Ridge, Tennessee. The project recently submitted an Early Site Permit (ESP) application with the Nuclear Regulatory Commission with the intent of installing a Small Modular Nuclear Power Station and is discussed in this article. Seismic source characterization included evaluation of the Eastern Tennessee Seismic Zone that was modeled as part of the Probabilistic Seismic Hazard Analysis (PSHA). Key LCI staff include Matt Huebner, Gabriel Toro, Ivan Wong, and Kevin Clahan.