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16. The consequences of the failure of these structures (owing to their side effects) for safety related ducts, pipes and other underground facilities passing near or through the facilities of the nuclear power plant should be given appropriate consideration. If hazardous effects are expected, appropriate countermeasures should be taken to protect the facility or otherwise the site layout should be reconsidered. 6. 1. Retaining walls can be classified into two groups: — Gravity walls in which the weight of the wall and possibly that of the retained soil play an important part in its stability; — Embedded walls, such as sheet walls, the stability of which depends on the passive pressure of soil and/or on anchors.

2]); — An appropriate model of the site, based on: • The geometrical description of the soil layers; • The velocities of the S and P waves in each layer; • The relative density of the soil in each layer; • The G–g and h-g curves which for each layer describe the apparent reduction of the shear modulus G and the internal damping ratio h of the soil with the shear strain g; — For those deep soil deposits in which wave velocities increase smoothly with depth, the change with depth of the aforementioned parameters.

7. The term dyke should be used for structures running along water courses and the term earth dam should be used only for a structure higher than 15 m, which is, in some cases, necessary to create a water reservoir upstream from a nuclear power plant. For designing dams and dykes appropriately, reference should be made to appropriate design manuals. 8. Before construction, in addition to classical geophysical and geotechnical tests, special attention should be paid to the permeability of the site close to the areas of the foundations.

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