Document: NUREG-0800
Document ID: 8981f423-79ff-42f4-9d5d-f0aa9777b60e
Document Type: srp
Title: STABILITY OF SLOPES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340606.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.5
CFR Part: 
CFR Title: 

Content:
hed by the applicant, these conclusions are summarized in the safety evaluation report (SER) or in a supplement to the SER. In the event that the applicant's investigation and design are not judged to be sufficiently conserva- tive, a staff position is stated and the applicant is asked to further substan- tiate his position by additional investigations or monitoring to demonstrate that a failure of the slopes in question will not harm the safety functions of the plant, or to concur in the staff position. The data needed to satisfy the requirements of this section are often incomplete in the early stages. However, sufficient field and laboratory data should be presented and conservatively interpreted to allow a realistic assessment of the safety of proposed slopes and supporting foundations. Detailed design investigations are usually still 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 time that the safety evaluation report (SER) input is required are in the foundation engineering and slope stability areas because actual conditions may not be revealed until excavations are opened; site visits con- ducted after construction permit (CP) 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 permit has been granted, detailed as-built documentation of these slopes and embankments, as well as complete stability and safety analyses; are necessary in the FSAR. 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