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35. The potential for failure of the bearing capacity of the subsurface materials for a nuclear power plant under static loading should be low so that there are high margins of safety under static loading (this is generally the case). These margins should be sufficient to meet SL-2 seismic loading conditions with reasonable safety margins. 36. If a required safety factor is achieved on the basis of a conservative assumption, no further analysis is generally required. It should be noted that acceptable safety factors depend on the method of analysis and on other considerations.

The available solutions are generally limited to those developed for the rigid–plastic solid of the classical theory of plasticity. This solid is assumed to exhibit no deformation prior to shear failure and a plastic flow at constant stress after failure. These solutions are acceptable provided that the actual situation under consideration satisfies the assumptions associated with the method. In the case of heterogeneous subsurface conditions, the ultimate bearing capacity should be determined by the sliding surface method.

At coastal sites, the possible adverse effects of varying levels of groundwater salinity on the foundation material and isolation material should be considered. 10. A building can be regarded as embedded only if the backfill has been properly compacted or if other appropriate measures have been taken. In such a case, the effects of embedment on the impedance of the foundation and on the soil–structure interaction should be taken into account. If the building is not mechanically embedded, only the consequences of the depth of the foundation should be taken into account, disregarding interaction effects of the soil with the underground walls.

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