HTGR edition of the standard format and content of safety analysis reports for nuclear power plants Page: 60 of 233
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motion associated with the Safe Shutdown Earthquake. Evaluation of the
following geologic features which could affect the foundations should
be presented: (Information presented in other sections may be cross-
referenced and need not be repeated.)
2.5.4.1 Geologic Features - Describe:
(1) Areas of actual or potential surface or subsurface subsidence,
uplift, or collapse resulting from:
(a) Natural features such as tectonic depressions and cavernous
or karst terrains, particularly those underlain by calcareous
or other soluble deposits;
(b) Man's activities, such as withdrawal or addition of subsurface
fluids, or mineral extraction;
(c) Regional warping.
(2) Deformational zones, such as shears, joints, fractures and folds,
or combinations of these features.
(3) Zones of alteration'or irregular weathering profiles, and zones
of structural weakness composed of crushed or disturbed materials.
(4) Unrelieved residual stresses in bedrock.
(5) Rocks or soils that might be unstable because of their mineralogy,
lack of consolidation, water content, or potentially undesirable
response to seismic or other events. (Seismic response character-
istics to be considered include liquefaction, thixotrophy,
differential consolidation, cratering, and fissuring.)
2.5.4.2 Properties of Underlying Materials - Describe in detail the
static and dynamic engineering properties of the materials underlying
the site. Furnish the physical properties of foundation materials such
as: grain-size classification, consolidation characteristics, water
content, Attenberg limits, unit weight, shear strength, relative density,
shear modulus, damping, Poisson's ratio, bulk modulus, strength under
cyclic loading, seismic wave velocities, density, porosity, and strength
characteristics. These data should be substantiated with appropriate
representative laboratory test records.
2.5.4.3. Plot Plan - Provide a plot plan or plans showing the locations
of all borings, trenches, seismic lines, piezometers, geologic profiles, and2.5-9
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HTGR edition of the standard format and content of safety analysis reports for nuclear power plants, report, July 1, 1973; United States. (https://digital.library.unt.edu/ark:/67531/metadc1017707/m1/60/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.