Document: NUREG-0800
Document ID: 5b0d8000-eb22-442c-a759-c14fed5c9c67
Document Type: srp
Title: EQUIPMENT AND FLOOR DRAINAGE SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070535.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.3.3
CFR Part: 
CFR Title: 

Content:
hose features of light-water cooled nuclear power plants that should be designed to withstand the effects of the SSE. With the information provided in Regulatory Guide 1.29, safety-related plant areas can be delineated, where the EFDS must perform safety-related functions and thus is required to be designed to Seismic Category I performance criteria. Compliance with GDC 2 will assure that all safety-related portions of the EFDS will continue to provide adequate drainage capacity during and following seismic events, so that postulated flooding events may be accommodated without water accumulation in areas where continued operability of safety-related equipment could be jeopardized by such accumulations. In addition, compliance with these regulatory requirements will assure that no failures of system components will jeopardize the integrity of the reactor coolant pressure boundary, the capability to shut down the reactor and maintain it in a safe shutdown condition, or the capability to prevent and/or mitigate the consequences of accidents that could result in potential offsite radiation exposures. 2. GDC 4 requires that SSCs important to safety be designed to accommodate the effects of and be compatible with the environmental conditions associated with normal operation, maintenance, surveillance testing, and postulated accidents. In regards to the EFDS, the purpose of GDC 4 is to assure the capability of the EFDS to provide the required drainage capacity to accommodate unanticipated flooding from pipe breaks, tank leaks, discharge from fire suppression systems, and other potential flooding sources. GDC 4 thus requires that in defining the design basis of the EFDS, consideration be given to the entire spectrum of flooding events, from relatively minor, operations related or testing related events to postulated accidents. Compliance with GDC 4 will assure that functions of safety-related equipment will not be impacted by undue water accumulations within the plant.