Document: NUREG-0800
Document ID: 14a7e985-4073-4df6-83ff-5b8ab0be42c4
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/ML1331/ML13316C068.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.5.2
CFR Part: 
CFR Title: 

Content:
the discussion of design criteria and analyses is acceptable if the criteria for the stability and design of all seismic Category I slopes are described and valid static and dynamic analyses have been presented to demonstrate that there is an adequate margin of safety. A number of different methods of analysis are available in the literature. To be acceptable, the static analyses should include calculations with different assumptions and methods of analysis to assess the following factors: 1. The uncertainties with regard to the shape of the slope, boundaries of the several types of soil within the slope and their properties, the forces acting on the slope, and pore pressures acting within the slope. 2. Failure surfaces corresponding to the lowest factor of safety. 3. The effect of the assumptions inherent in the method of analysis used. 4. Adverse conditions such as high water levels due to the probable maximum flood (PMF), tsunamis, sudden drawdown, or steady seepage at various levels. In general, safety factors related to the slope hazard are needed; however, actual values depend somewhat on the method of analysis, on the assumptions concerning the soil properties, on construction techniques, and on the range of material parameters. To be acceptable, the dynamic analyses must account for the effect of cyclic motion of the earthquake on soil strength properties as well as the potential effects of both horizontal and vertical components of shaking. In general, both horizontal and vertical components of shaking should be applied simultaneously in the slope stability analysis, unless adequate technical justification is provided to show that the vertical component of earthquake ground motion has a negligible effect on the stability analysis and that sufficient conservatism exists in the stability analysis for the horizontal ground motion. 2.5.5-7 Revision 5 – July 2014 Actual test data are needed for both the in situ soils as well as for any materials used in the