Document: NUREG-0800
Document ID: 92e07546-68d7-4c8e-a984-7d1f1f4d882d
Document Type: srp
Title: EQUIPMENT AND FLOOR DRAINAGE SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550042.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.3.3
CFR Part: 
CFR Title: 

Content:
ostulated accidents (pipe break, tank ruptures) will be considered acceptable if the EFDS is designed to prevent flooding that could affect SSCs important to safety (i.e., necessary for safe shutdown, accident prevention, or accident mitigation) adversely. 9.3.3-5 Revision 3 - March 2007 3. Control of Releases of Radioactive Material to the Environment. Information that addresses the requirements of GDC 60 regarding the suitable control of the release of radioactive materials in liquid effluent, including anticipated operational occurrences will be considered acceptable if the EFDS is designed to prevent the inadvertent transfer of contaminated fluids to a noncontaminated drainage system for disposal. Technical Rationale The technical rationale for application of these acceptance criteria to the areas of review addressed by this SRP section is discussed in the following paragraphs: 1. GDC 2 requires that SSCs important to safety be designed to withstand the effects of natural phenomena like earthquakes, tornadoes, hurricanes, and floods without loss of capability to perform safety functions. EFDS safety-related functions have both active and passive aspects (e.g., flood prevention by such components as check valves, adequate drainage capacity to accommodate unplanned water intrusion in plant areas with SSCs important to safety). Both direct and indirect safety impacts are attributed to EFDS performance during a safe shutdown earthquake. By adequate drainage capacity EFDS must avert direct effects on safety-related equipment from inundation. Nonsafety-related equipment must be protected if its failure could reduce the functional reliability of safety-related equipment to unacceptable safety levels, or result in incapacitating injury to control room occupants or render the control room uninhabitable. GDC 2 assures that all EFDS safety-related portions will continue to provide adequate drainage capacity during and following natural phenomena to accommodate postulated