Document: NUREG-0800
Document ID: bb233b69-c637-41e8-9774-95be0cc8b117
Document Type: srp
Title: STATION SERVICE WATER SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550056.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.2.1
CFR Part: 
CFR Title: 

Content:
tand SSE effects. SSCs that should be designed to remain functional in SSEs are designated as Seismic Category 1. RG 1.29, Position C.1, states that systems required for safe shutdown, including their foundations and supports, are designated as Seismic Category I and should be designed to withstand SSE effects and remain functional. RG 1.29, Position C.2, states that SSCs with continued functions not required, the failure of which could reduce the functioning of any seismic Category I plant feature to an unacceptable safety level or could result in incapacitating injury to control room occupants, should be designed and constructed so that SSEs would not result in such failures. RG 1.29, Positions C.1 and C.2, assure that the SWS will remain functional during a SSE and provide essential cooling water necessary for the operation of safety-related components and decay heat removal. 2. GDC 4 requires that SWS SSCs providing essential cooling for safety-related equipment be designed to accommodate the effects of, and to be compatible with, the environmental conditions of normal operation, maintenance, testing, and postulated accidents and be protected appropriately against dynamic effects, including those of missiles, pipe whipping, and discharging fluids, from equipment failures and external events. GDC 4 assures that the SWS will remain functional under postulated environmental conditions and provide essential cooling water necessary for the operation of safety-related components and decay heat removal. 3. GDC 5 prohibits the sharing of SSCs among nuclear power units unless such sharing can be shown not to significantly impair their ability to perform safety functions, including, in an accident in one unit, an orderly shutdown and cool-down of the remaining unit(s). The SWS provides essential cooling water necessary for the operation of safety-related components and decay heat removal and be designed for each unit’s ability to perform safety-related functions without