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:
eration 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; 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 site dewatering systems to minimize the dynamic design loads on these structures. 2.4.12-6 Revision 3 - March 2007 For applications pursuant to 10 CFR Part 52, meeting the applicable requirements of 10 CFR 52.17 and 10 CFR 52.79 that correspond to GDC 2 provides a level of assurance that the most severe hydrologic site characteristics have been identified; whether GDC 2 is met with respect to the adequacy of the associated design bases will be evaluated pursuant to other SRP sections. 4. Compliance with GDC 4 requires that components important to safety be designed to accommodate the effects of (and be compatible with) environmental conditions associated with normal operation, maintenance, testing, and postulated accidents (e.g., loss-of-coolant accidents and dynamic effects, including pipe whip, missiles, and discharging fluids). The design of any dewatering system intended to protect safety-related structures should be consistent with this design objective. SRP Section 2.4.12 provides guidance on the design of safety-related dewatering systems and the necessity to accommodate adverse environmental conditions (e.g., waterline breaks) with the potential to degrade or overwhelm the system. Meeting the requirements of GDC 4 provides assurance that safety-related dewatering systems will not be