Document: NUREG-0800
Document ID: 0a8f3dad-b3bb-46ae-9305-576e9973cdb9
Document Type: srp
Title: Design Criteria and Analyses.  In meeting the requirements of 10 CFR Parts 50 and 100,
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1006/ML100610529.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.5.2
CFR Part: 
CFR Title: 

Content:
drodynamic and pore pressure forces, should be varied to show that there is an adequate margin of safety. Where liquefaction is possible, major dam foundation slopes and embankments should be analyzed by state-of-the-art finite-element or finite difference methods of analysis. Where there are liquefiable soils, changes in pore pressure due to cyclic loading must be considered in the analysis to assess not only the potential for liquefaction but also the effect of pore pressure increase on the stress-strain characteristic of the soil and the post-earthquake stability of the slopes. The criteria, design techniques, and analyses are evaluated by the staff to ascertain that: 1. Appropriate state-of-the-art methods have been employed. 2. Conservative assumptions regarding soil and rock properties have been used in the design and analysis of slopes and embankments as discussed above in subsection 2.5.5.1. 3. Appropriately conservative margins of safety have been incorporated in the design. The criteria and design methods used by the applicant are reviewed to ascertain that state-of-the-art techniques are being employed. The design analyses are reviewed to be sure that the most conservative failure approach has been used and that all adverse conditions to which the slope might be subjected have been considered. Such conditions include ground motions, both horizontal and vertical, from the safe shutdown earthquake, settlement, cracking, flood or low-water steady-state seepage, sudden drawdown of an adjacent reservoir, or a reasonable assumption of the possible simultaneous occurrence of two natural events such as an earthquake and flood. The review is also concerned with determining whether or not the soil and rock characteristics derived from the investigations described in subsection 2.5.5.3 have been completely and conservatively incorporated into the design. When marginal factors of safety are indicated by the independent analyses performed by the staff and its