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:
er 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. Meeting the requirements of GDC 2 provides a level of assurance that structures, systems, and components important to safety have been designed to withstand or are protected against high groundwater levels and dynamic loadings resulting from the most severe earthquake likely to occur.17 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 seriously affected by adverse environmental conditions resulting from normal operations or an accident within or near site structures.18 5. Compliance with GDC 5 requires that nuclear power units do not share structures, systems, and components important to safety unless it can be shown that such sharing will not impair their ability to perform required safety functions. SRP Section 2.4.12 describes staff positions related to the design of a safety-related dewatering system. Such a system is usually designed to protect an entire site. This criterion is applicable because it provides the basis for