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:
effects of earthquakes. Acceptance is based on RG 1.29, Position C.1 for the safety-related portions and Position C.2 for the nonsafety-related portions. 2. The applicant meets GDC 4 requirements for the effects of missiles inside and outside of containment, effects of pipe whip, jets, and environmental conditions from high- and moderate-energy line breaks, and dynamic effects of flow instabilities (i.e., water hammer loads) as to impairment of required SWS functions during normal plant operations and under upset or accident conditions. Acceptance for water hammer effects is based on the following: A. Vents are provided at high points for liquid-filled, but normally idle, piping (or systems) where voiding can occur. These vents should be designed for ease of periodic operational testing. B. Consideration is given to voiding following pump shutdown or during standby. If in the system design voiding could occur, the design should provide for a slow system fill upon pump start to avoid water hammer, or the design should maintain functions following an inadvertent water hammer occurrence. C. Operating and maintenance procedures are reviewed by the applicant for assurance of sufficient measures for avoiding water hammer (e.g., rapid fill due to pump start, periodic fill and vent checks, avoidance of sudden valve movement or realignment). 3. The applicant meets GDC 5 requirements for sharing of SSCs by demonstrating that such sharing does not significantly impair SWS capability to perform its safety function, including in an accident in one unit an orderly shutdown and cool-down of the remaining unit(s). In addition, the applicant complies with the guidance of GL 91-13. 4. The applicant meets GDC 44 requirements for cooling water by providing a system to transfer heat from SSCs important to safety to an ultimate heat sink. The applicant has demonstrated that the SWS can transfer the combined heat load of these SSCs under normal operating and accident conditions, assuming