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:
gn 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 loadings on subsurface portions of safety related structures, systems and components must be addressed in the application.12 Technical Rationale13 DRAFT Rev. 3 - April 1996 2.4.12-4 The technical rationale for application of these acceptance criteria to reviewing the hydrologic description of a nuclear power plant site is discussed in the following paragraphs:14 1. Compliance with 10 CFR 50.55 requires that any holder of a facility construction permit who obtains information indicating the reasonable possibility of a deficiency related to construction or a compliance failure involving substantial safety hazards must notify the Commission. This criterion is applicable to Section 2.4.12 inasmuch as the design of permanent dewatering systems (a cost-effective technique frequently employed at nuclear power plants to minimize foundation design complexities) requires information that can only be inferred from measurements available before construction begins. For this reason, data gathered during construction excavation often indicate the need to modify designs for dewatering systems. Changes with the potential to affect a safety-related structure or system must have the concurrence of NRC reviewers. Meeting these requirements provides a level of assurance that the foundations of plant structures, systems, or components important to safety are not vulnerable to groundwater hazards more severe than those considered when the design bases were established.15 2. Compliance with 10 CFR 50.55a requires that structures, systems, and components shall be designed, fabricated, erected, constructed, tested, and inspected in accordance with the requirements of applicable codes and standards commensurate with the importance of each safety function. Section 50.55a specifies appropriate