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:
ental 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. 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 requiring that a dewatering system be designed and sized so that an accident, such as a major waterline break in one unit, will not degrade the system to the extent that hydrostatic loadings will exceed the original design bases of safety-related structures associated with other units. Meeting these requirements will provide a level of assurance that a site dewatering system shared by two or more nuclear units will be designed so that no single failure will prevent the system from performing its safety function. 6. As specified in 10 CFR 100.10(c), the site’s physical characteristics (including seismology, meteorology, geology, and hydrology) should be considered when determining its acceptability for a nuclear power reactor. Paragraph 100.10(c)(3) stipulates that special precautions should be planned if a reactor is to be located at a site where a significant quantity of radioactive effluent might find ready access to underground water tables. To satisfy the hydrologic requirements of 10 CFR Part 100, the NRC staff review of the applicant's SAR should verify the description of groundwater conditions at the proposed site and of how those conditions will be affected by the