Document: NUREG-0800
Document ID: 57051ec2-9a01-488e-8294-573ed557f3eb
Document Type: srp
Title: GROUNDWATER
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070262.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.12
CFR Part: 
CFR Title: 

Content:
A, the following specific criteria are used: For SAR Section 2.4.12.4: The design bases (and development thereof) for groundwater-induced loadings on subsurface portions of safety-related structures, systems, and components must be described. If a permanent dewatering system is employed to lower design basis groundwater levels, the bases for the design of the system and determination of the design basis for groundwater levels must be provided. Information must be provided regarding (a) all structures, components, and features of the system; (b) the reliability of the system as related to available performance data for similar systems used at other locations; (c) the various soil parameters (such as permeability, porosity, and specific yield) used in the design of the system; (d) the bases for determination of groundwater flow rates and areas of influence to be expected; (e) the bases for determination of time available to mitigate the consequences of system failure where system failure could cause design bases to be exceeded; (f) the effects of malfunctions or failures (such as a single failure of a critical active component or failure of circulating water system piping) on system capacity and subsequent groundwater levels; and (g) a description of the proposed groundwater level monitoring program and outlet flow monitoring program. Specific criteria relating to the design of permanent dewatering systems are presented in the attached Branch Technical Position HGEB-1, "Safety-Related Permanent Dewatering Systems." In addition, if wells are proposed for safety-related purposes, the hydrodynamic design bases (and development thereof) for protection against seismically induced pressure waves must be described and be consistent with site characteristics. For standard design certification applications, information pertaining to groundwater conditions should be provided in the site parameter envelope that must be met by the proposed plant design. The groundwater-induced