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:
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 codes and standards for use in the design, construction, and inspection of dewatering systems intended for the protection of safety- related structures that might be affected by higher levels of groundwater. This is an important consideration in such areas as foundation design and slope stability, particularly when the potential exists for seismic ground motion that could cause soil liquefaction. Meeting these requirements provides a level of assurance that the plant structures, systems, or components important to safety are designed to withstand (or are protected against the effects of) high levels of groundwater.16 3. Compliance with GDC 2 requires that nuclear power plant structures, systems, and components important to safety be designed to withstand the effects of natural phenomena such as earthquake, tornado, hurricane, flood, tsunami, and seiche without loss of capability to perform their safety functions. The criterion further specifies that the design bases for these structures, systems, and components shall reflect the following: a. Appropriate consideration of the most severe natural phenomena historically reported for the site and surrounding area, with sufficient margin for the limited accuracy, quantity, and time period in which the historical data have been accumulated; 2.4.12-5 DRAFT Rev. 3 - April 1996 b. Appropriate combinations of the effects of normal and accident conditions with the effects of the natural phenomena; and c. The importance of the safety functions to be performed. This criterion is applicable to SRP Section 2.4.12 because the groundwater level is often an important consideration in establishing seismic design bases for the foundations of safety-related structures. Such concerns frequently result in decisions to design and construct