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Example Soil Description Report-Sections 2.3.1 and 2.3.2 of Site

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Example Soil Description Report-Sections 2.3.1 and 2.3.2 of Site Example for Discussion Regarding Level of Detail Only EXAMPLE SOIL DESCRIPTION REPORT—SECTIONS 2.3.1 AND 2.3.2 OF SITE HAZARD AND SCREENING REPORT 2.3 Site Response Evaluation Following the guidance contained in Seismic Enclosure 1 of the 3/12/2012 50.54(f) Request for Information and in the SPID (CEUS-SSC, 2013a) for nuclear power plant sites that are not sited on hard rock (defined as 2.83 km/sec), a site response analysis was performed for SITE. 2.3.1 Description of Subsurface Material The SITE NPP site consists of about 25 ft of lacustrine sandy silty soils overlying about 75 ft of glacial drift till. The shallow soils overly about 6,000 ft of firm to hard Paleozoic sedimentary rocks below which lies Precambrian Basement. Table 1 shows the stratigraphic column and unit thicknesses (REFERENCE) based on well logs in the vicinity of the site. Example for Discussion Regarding Level of Detail Only TABLE 2.3.1-1 (REFERENCE) BEDROCK STRATIGRAPHY AND UNIT THICKNESSES TOP BOTTOM TOP BOTTOM EL (ft) EL (ft) LITHOLOGY DEPTH DEPTH (ft) (ft) Pleistocene Lacustrine deposits: very fine sandy, clayey silt 625 594 and silty clay 0 31 594 565 Pleistocene: Glacial Drift 31 60 Devonian Ohio Shale. Chagrin Shale: gray silty to clayey 565 -135 shale with sand shale laminae 60 760 Devonian Ohio Shale. Heron Shale: black to brown shale -135 -660 with silty and sandy laminae 760 1285 Devonian Delaware and Columbus formations: hard, dense, -660 -970 cherty limestone, or a dolomitic limestone 1285 1595 Devonian Oriskany Sandstone: fine-to medium-grained -970 -980 sandstone 1595 1605 -980 -1030 L. Devonian to U. Silurian Helderberg Limestone 1605 1655 U. Silurian Bass Island Group: argillaceous, dolomitic -1030 -1130 limestone, and calcareous dolomite 1655 1755 U. Silurian Salina Group: interbedded evaporite and -1130 -1830 carbonate rocks 1755 2455 -1830 -2080 M. Silurian Lockport Group: dolomite 2455 2705 -2080 -2110 M. Silurian Rochester “Packer” Shale 2705 2735 -2110 -2290 M. Silurian Clinton Group: dolomite, limestone, and shale 2735 2915 -2290 -2305 M. Silurian Medina Formation: sandstone 2915 2930 Upper Ordivician Queenstown Formation: shale, siltstone, -2305 -2505 and sandstone 2930 3130 Middle to Upper Ordovician Reedsville Formation: fine- -2505 -3945 grained shale, limestones, and dolomites 3130 4570 -3945 -4435 M. Ordivician Trenton Limestone and Dolomite 4570 5060 Middle Ordivician Chazy Formation (Black River/Gull River/ -4435 -4615 Glenwood): limestone 5060 5240 -4615 -4715 L. Ordivician Copper Ridge Formation: dolomite 5240 5340 U. Cambrian Conasauga Formation: limestone and -4715 -4930 5340 5555 sandstone Example for Discussion Regarding Level of Detail Only TABLE 2.3.1-1 (REFERENCE) BEDROCK STRATIGRAPHY AND UNIT THICKNESSES (CONTINUED) TOP BOTTOM TOP BOTTOM EL (ft) EL (ft) LITHOLOGY DEPTH DEPTH (ft) (ft) -4930 -4970 M. Cambrian Rome Formation: dolomite 5555 5595 -4970 -5160 M. Cambrian Shady formation: dolomite 5595 5785 -5160 -5300 M. Cambrian Mt. Simon Formation: sandstone 5785 5925 Precambrian regionally-metamorphosed schists, gneisses, -5300 marbles, and calc-silicate granulites 5925 The following description of the Paleozoic sequence is taken directly from REFERENCE: “Bedrock directly beneath the Site belongs to the Upper Devonian Ohio Shale Formation, which has been broken down into numerous member units. Because the Site sits on the northwestern flank of the Appalachian geosyncline, the rocks dip gently to the south at a gradient of approximately 20 to 40 ft per mile. The members of the Ohio Shale are, from oldest to youngest, the Plum Brook, Huron, Chagrin, Cleveland, and Bedford shale members. The Ohio Shale beneath the Site is composed of the Upper Devonian Chagrin Shale and Huron Shale members as the stratigraphicly higher members have been eroded away from this location. These members extend to depths on the order of 1,250 ft below the ground surface. The Chagrin Shale member is composed of dark-gray to medium-gray silty or clayey shale occasionally containing light gray sandy shale laminae and is approximately 700 ft thick below the Site. The underlying Heron Shale is a black to dark brown shale with lesser amounts of thinly bedded light gray silty and sandy laminae than the Chagrin Shale and is estimated to be about 525 ft thick below the Site. It is not clear from well log data that the Plum Brook shale is present or not at the bottom of the Ohio Shale below the Site, as it may have been eroded prior to Heron shale deposition. The remainder of the deeper stratigraphy is based upon analysis of formation tops and bottoms from deep well logs obtained from the Ohio Geological Survey in combination with information from the FSAR. The units and thickness down to the Lower Silurian were obtained from deep wells that are located within 2.5 miles of the Site; while the units and thicknesses below the Lower Silurian are interpreted from deeper wells located about 3 to 4 miles to the southeast of the Site down to Precambrian Basement. Due to the close proximity to the Site of these deep wells, the unit lithologies and thicknesses can be assumed to be very similar to those below the Site.” 2.3.2 Development of Base Case Profiles and Nonlinear Material Properties Example for Discussion Regarding Level of Detail Only Table 2.3.2-1 (REFERENCE) shows the recommended shear-wave velocities and unit weights along with elevations and corresponding stratigraphy. From Table 2.3.2-1 the SSE control point is at elevation 560.9 ft within the Devonian Chagrin Shale at a best-estimate shear-wave velocity of 4,472 ft/s and a range of 4,266 ft/s to 5,229 ft/s. The shallow Chagrin Shale shear- wave velocities reflect the only measured shear-wave velocities below the SSE Control Point and appear to be based on laboratory testing for shear moduli (REFERENCE). Example for Discussion Regarding Level of Detail Only TABLE 2.3.2-1 (REFERENCE) SUMMARY OF GEOTECHNICAL PROFILE DATA FOR GRMS ELEVATION LAYER (ft) NO. SOIL/ROCK DESCRIPTION γtotal (pcf) Vs (ft/s) μ 620 Plant Grade (Ground Surface EL 620) (622) 122 827 A 624 to 612I 1a Lacustrine Deposits (110-145)H (675-955)E, J 0.33 (615) 613 to 624 Ground Water EL 122 827 A 612 to 605 1b Lacustrine Deposits (110-145)H (675-955)E,J 0.49 129 827 A 605 to 594 1c Lacustrine Deposits (110-145)H (675-955)E, J 0.47 (594) 132 899 A 597 to 586 2a Glacial Drift-Upper Till (110-145)H (773-1009)E, J 0.44 1785 (586) 141 E, J 2b Glacial Lower Till (1671-1901) 0.44A 589 to 565 (100-170)H 560.9 GMRS EL -SSE Control Point Nuclear Island Foundation Level 4472 (565) 152 E, J 3a Devonian Chagrin Shale (4266-5229) 0.36A 572 to 556 (88-188)H 556 to 510 3b Devonian Chagrin Shale 152 5273 0.32 531 FIRS EL – Emergency Service Water Pump House Foundation EL 510 to 392 3c Devonian Chagrin Shale 152 5203 0.30 392 to -135 4a Devonian Heron Shale 152 5203 0.30 -135 to -470 4b Devonian Heron Shale 152 6187 0.28 510 to 392 3c Devonian Chagrin Shale 152 5203 0.30 392 to -135 4a Devonian Heron Shale 152 5203 0.30 -135 to -470 4b Devonian Heron Shale 152 6187 0.28 -660 5a Devonian D&C Limestone 168 6187 0.28 -709 5b 168 10540 0.30 -970 6 Devonian Oriskany Sandstone 157 10540 0.30 Example for Discussion Regarding Level of Detail Only TABLE 2.3.2-1 (REFERENCE) SUMMARY OF GEOTECHNICAL PROFILE DATA FOR GRMS (CONTINUED) ELEVATION LAYER SOIL/ROCK DESCRIPTION γtotal (pcf) Vs (ft/s) μ (ft) NO. -980 7 Dev-Sil Helderberg Limestone 168 10540 0.30 -1030 8 Silurian Limestone Dolomite 168 10540 0.30 -1130 9a Silurian Salina Carbonate 150 10540 0.30 Rocks -1193 9b 150 8577 0.26 -1455 9c 150 7152 0.30 -1830 10a Silurian Lockport Group 170 11784 0.30 -2015 10b 170 7979 0.30 -2080 11 Silurian Rochester Shale 157 7979 0.30 Silurian Dolomite, Limestone, -2110 12 Shale 170 7979 0.30 -2290 13 Silurian Medina Sandstone 157 7979 0.30 -2305 14 Ordivician Queenstown Shale- 157 7979 0.30 Notes: A. Cross hole test B. Down hole test C. Lab sonic test D. Refraction test E. Back-calculation from stiffness parameters adopted in FSAR (Note f) F. Design parameters adopted in FSAR G. Cyclic torsion test H. In-situ test results I. From this elevation down, soil parameters are estimates from sonic velocities of deep wells except unit weight. Unit weights are typical values from literature. Coefficient of variation (COV) = 10 percent for seismic wave velocities. Poisson’s ratio and Gmax are calculated by following formula: 2 2 ν = ([Vp/Vs] – 2) / (2[Vp/Vs] – 2) 2 Gmax = ρ Vs J. Recommended variability (it is based on the variability of shear modulus) K. Recommended variability L. Table 2.5-61 of the FSAR For the deeper sedimentary rocks, shear-wave velocities and stratigraphy were based on available well log data within several (up to seven) miles of the site. Shear-wave velocities were determined from sonic logs using literature based compression-to-shear-wave velocity ratios which accommodate differences in geology (limestone and dolomite, anhydrites, and salts), Example for Discussion Regarding Level of Detail Only porosity, and density. Based on the available sonic logs, estimates of shear-wave velocities with geology specific attributes were provided to a depth of about 3,000 ft (elevation -2,305 ft, Table 2.3.2-1).
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