Document: NUREG-0800
Document ID: ce3522a1-5c42-492a-95d7-9087534cf63c
Document Type: srp
Title: STABILITY OF SLOPES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070270.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.5
CFR Part: 
CFR Title: 

Content:
l in progress and final design conclusions have often not been made. Because of this, the question and answer exchange is not generally complete at the Q-2 stage. Most of the open items of Section 2.5 remaining at the 37 time that the safety evaluation report (SER) input is required are in the foundation engineering 38 and slope stability areas because actual conditions may not be revealed until excavations are opened; site visits conducted after construction permit (CP) or combined license (COL)39 issuance are therefore necessary. All natural safety-related slopes are examined during at least one of the two site visits required of the staff. Because excavated slopes or embankments are not usually constructed until after a construction permitCP or COL has been granted, detailed as-built documentation of these 40 slopes and embankments, as well as complete stability and safety analyses, are necessary in the FSAR.41 Following is a brief description of the review procedures conducted by the staff in evaluating the slope stability aspects of nuclear power plant sites. Subsection 2.5.5.1. Plot plans, cross sections, and profiles of all safety-related slopes in relation to the topography and physical properties of the underlying materials are reviewed and compared with exploratory records to ascertain that the most critical conditions have been addressed and that the characteristics of all slopes have been defined. The soil and rock test data are reviewed to assureensure that there is sufficient relevant test data to verify the soil strength characteristics assumed for the slopes, dikes, and dams under analysis. The evaluation is to some extent a matter of engineering judgment; however, if the safety factors resulting from the analysis are not appropriate to the hazards posed by a slope failure and other than clearly 2.5.5-11 DRAFT Rev. 3 - April 1996 conservative soil properties and profiles were used, the applicant is required to obtain additional data to verify his