Document: NUREG-0800
Document ID: c6f1872f-6590-4af8-b290-f6ec212570a9
Document Type: srp
Title: GROUNDWATER
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070730443.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.12
CFR Part: 
CFR Title: 

Content:
for dewatering systems. Changes with the potential to affect a safety-related structure or system should 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. 2. Compliance with 10 CFR 55.55a 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. 10 CFR 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. 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