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Victoria County Station ESP, SSAR, Rev. 1 Victoria County Station ESP Application Part 2 — Site Safety Analysis Report Subsection 2.5.1 Table of Contents Section Title Page 2.5 Geology, Seismology, and Geotechnical Engineering ........................................ 2.5.1-1 2.5.1 Basic Geologic and Seismic Information ........................................................ 2.5.1-3 2.5.1.1 Regional Geology ................................................................................. 2.5.1-4 2.5.1.2 Site Area Geology .............................................................................. 2.5.1-64 2.5.1.3 References ....................................................................................... 2.5.1-102 2.5.1-A Geophysical Cross Sections .....................................................................2.5.1-A-1 2.5.1-i Revision 1 Victoria County Station ESP Application Part 2 — Site Safety Analysis Report Subsection 2.5.1 List of Tables Number Title 2.5.1-1 Growth Faults within Site Vicinity 2.5.1-2 Summary of Meers Fault Characterizations from Existing Literature 2.5.1-3 Seismic Reflection Horizon Depths 2.5.1-4 Updip Fault Terminations and Horizon Offsets Observed in Seismic Lines 2.5.1-5 Active Wells Victoria County Station Site 2.5.1-ii Revision 1 Victoria County Station ESP Application Part 2 — Site Safety Analysis Report Subsection 2.5.1 List of Figures 2.5.1-1 Map of Physiographic Provinces 2.5.1-2a Regional Geologic Map (200-Mile Radius) 2.5.1-2b Explanation for Regional Geologic Map (200-Mile Radius) 2.5.1-3 Physiographic Map of Texas 2.5.1-4 Site Area Geologic Map (5-Mile Radius) 2.5.1-5 Site Geologic Map (0.6-Mile Radius) 2.5.1-6 Site Vicinity Topographic Map (25-Mile Radius) 2.5.1-7 Geologic Time Scale 2.5.1-8 Aulacogens of Laurentia 2.5.1-9 Regional Cross Section 2.5.1-10 Mesozoic Stratigraphic Column 2.5.1-11 Simplified Map of Tectonic Features in Site Region (200-Mile Radius) 2.5.1-12 Geologic Features of the Gulf Coast Region 2.5.1-13 Isopach Map of the Upper Cretaceous Rocks of the Gulf of Mexico Basin 2.5.1-14 Crustal Structure of the Ouachita Mountains, Coastal Plains, and Northern Gulf of Mexico 2.5.1-15 Cenozoic Stratigraphic Column 2.5.1-16 Cenozoic Sediment Dispersal Axes of the Gulf of Mexico 2.5.1-17 Quaternary Deposits of the Gulf Coastal Plains 2.5.1-18 Gravity Anomalies, Crustal Transitions, and Gravity Features in Site Region (200-Mile Radius) 2.5.1-19 Magnetic Anomalies, Crustal Transitions, and Magnetic Features in the Site Region (200-Mile Radius) 2.5.1-20 Classification of Gulf Opening Models 2.5.1-21 Opening of the Gulf of Mexico 2.5.1-22 Significant Capable Faults and Associated Seismicity Near the Site Region 2.5.1-23 Site Vicinity Geologic Map (25-Mile Radius) 2.5.1-24 Generalized Stress Map 2.5.1-25 Potential Quaternary Features in Site Region (200-Mile Radius) 2.5.1-26 Gravity Anomaly Map and Depth to Base of Mesozoic Sediments 2.5.1-27 Regional Magnetic Anomaly Map 2.5.1-28 Regional Gravity Anomaly Map 2.5.1-29 Gravity and Magnetic Profile B’-B 2.5.1-30 Regional Gravity Anomaly Map and Bathymetry 2.5.1-iii Revision 1 Victoria County Station ESP Application Part 2 — Site Safety Analysis Report List of Figures (Cont.) Number Title 2.5.1-31 Site Area Topographic Map (5-Mile Radius) 2.5.1-32 Site Topographic Map (0.6-Mile Radius) 2.5.1-33 Location and Orientation of Cross Sections of Geophysical Boring Logs 2.5.1-34 Cross Section X-X’ 2.5.1-35 Cross Section Y-Y’ 2.5.1-36 Site Vicinity (25-Mile radius) Growth Fault Surface Projections 2.5.1-37 Site Area (5-Mile radius) Lineaments from Aerial Photographs 2.5.1-38 Fault D 2.5.1-39 Fault E 2.5.1-40 Site Area (5-Mile radius) Growth Fault Surface Projections and LiDAR Lineaments 2.5.1-41 Region of Seismic Reflection Data 2.5.1-42 Site Area (5-Mile radius) Lineaments from LiDAR 2.5.1-43 Plant Layout and Fault D 2.5.1-44 Site Vicinity (25-Mile radius) Lineaments from LiDAR 2.5.1-45 2-D Reflection Profile "TGS" Time Migrated 2.5.1-46 2-D Reflection Profile "GSI" Time Migrated 2.5.1-47 2-D Reflection Profile "GDI" Time Migrated 2.5.1-48 2-D Reflection Profile "GDI" Depth Migrated 2.5.1-49 Fault D Cross Section Locations 2.5.1-50a Fault D Topographic Cross Sections (Profiles 1, 2, and 3) 2.5.1-50b Fault D Topographic Cross Sections (Profiles 4, 5, and 6) 2.5.1-50c Fault D Topographic Cross Sections (Profiles 7 and 8) 2.5.1-51 Active Oil Wells in Southern Victoria County, Texas 2.5.1-52 Mineral Leasing Rights on Victoria County, Texas 2.5.1-iv Revision 1 Victoria County Station ESP Application Part 2 — Site Safety Analysis Report 2.5 Geology, Seismology, and Geotechnical Engineering This section presents information on the geological, seismological, and geotechnical characteristics of the VCS site and the region surrounding the site. The data and analyses in this section document Exelon’s evaluation of the suitability of the site. Section 2.5 provides sufficient information to support evaluations of the site-specific ground motion response spectra and provides information to permit adequate engineering solutions to geologic conditions and seismic effects at the proposed site. References in this section to "Unit 1" and/or "Unit 2" are based on an assumed dual unit plant arrangement, with Unit 1 located in the western half of the designated ESP Power Block Area and Unit 2 located in the eastern half of the designated ESP Power Block Area (Reference Figures 1.2-1 and 1.2-2). In cases where more than two units would be built (e.g., mPower reactor design), the units would be divided between the eastern and western halves of the power block area. Section 2.5 is divided into five subsections that generally follow the organization of RG 1.206. 2.5.1 — Basic Geologic and Seismic Information 2.5.2 — Vibratory Ground Motion 2.5.3 — Surface Faulting 2.5.4 — Stability of Subsurface Materials and Foundations 2.5.5 — Stability of Slopes The VCS site is located within the Texas Gulf Coastal Plains physiographic province about 120 miles (193 km) southwest of Houston and about 13 miles (21 km) south of the city of Victoria, the county seat of Victoria County. The site topography consists of gently-to-moderately rolling hills covered by grassland. The local terrain is covered with shallow residual soils overlying the Pleistocene Beaumont Formation, consisting of sands and clays deposited in a fluvial-deltaic environment during the Pleistocene Sangamon interglacial stage. The geological and seismological information presented in this section was developed from a review of published geologic literature, interviews with experts in the geology and seismotectonics of the site region, aerial photo analysis, and geologic fieldwork performed as part of the ESP application (including a site investigation of this greenfield location and two geologic field reconnaissances). A list of the references used to compile the geological, seismological, and geotechnical information presented in the following sections is provided at the end of each major subsection within Section 2.5. 2.5.1-1 Revision 1 Victoria County Station ESP Application Part 2 — Site Safety Analysis Report The review of regional and site geologic, seismic, and geophysical information and an evaluation of the updated earthquake catalog confirmed the use of appropriate seismic sources in the probabilistic seismic hazard analysis (PSHA) as well as the need to include updated New Madrid seismic source zones to reflect current information on source geometries, maximum earthquake magnitudes, and recurrence parameters. Borings at the site provided geologic and geotechnical data to characterize material properties of the soil. Subsection 2.5.1.1 describes the geologic and structural setting of the region within a 200-mile (322-km) radius of the site. Subsection 2.5.1.2 describes the geology and structural setting of the site vicinity (25-mile or 40-km radius), site area (5-mile or 8-km radius), and site (0.6-mile or 1-km radius). The geological and seismological information was developed in accordance with the guidance presented in RG 1.206, Subsection 2.5.1, Basic Geologic and Seismic Information, and RG 1.208, A Performance-Based Approach to Define the Site-Specific Earthquake Ground Motion, and is intended to satisfy the requirements of 10 CFR 100.23(c). The geological and seismological information presented in this subsection is used as a basis for evaluating the detailed geologic, seismic, and man-made hazards at the site. Subsection 2.5.2 describes the methodology used to develop the ground motion response spectra (GMRS) for the VCS site. RG 1.208 further requires that the geological, seismological, and geophysical database be updated and any new data evaluated to determine whether revisions are required to the 1986 seismic source model developed by the Electric Power Research Institute (EPRI) in conjunction with the Seismicity Owners Group (SOG). Subsection 2.5.2 provides an update of the geological, seismological, and geophysical database for the VCS site, focusing on whether any data published since 1986 indicates a significant change to the 1986 seismic source model, referred to hereafter as the 1986 EPRI-SOG study (Reference 2.5.1-1). Bechtel Power Corporation, supported by William Lettis & Associates, Inc. and Risk Engineering, Inc., conducted an assessment of ground motion at the VCS site using the guidance provided in RG 1.208.
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