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:
afety features) and nonessential (used for normal operation) portions. For variations from the typical arrangement, the reviewer adjusts the review procedures; however, the system design must meet the acceptance criteria of subsection II. Also, the reviewer needs to refer to SRP sections for other systems interfacing with the SWS depending upon the nature and conditions of the ultimate heat sink cooling water (e.g., salt water). Evaluation of various generic issues and plant-specific probabilistic risk assessments show that the loss of the SWS may contribute significantly to the potential for a core damage accident. A review of industry experience and plant-specific probabilistic risk assessments is available in NUREG-1461 (Reference 15), which provides insights into SWS vulnerabilities. 1. The SAR is reviewed for whether the system description and piping and instrumentation diagrams (P&IDs) show the SWS equipment used for normal operation and the minimum system heat transfer and flow requirements for normal plant operation. The system performance requirements also are reviewed for whether the SAR describes component allowable operational degradation (e.g., pump leakage) and the procedures followed to detect and correct these conditions when they become excessive. 9.2.1-8 Revision 5 - March 2007 2. The reviewer, using the results of failure modes and effects analyses as appropriate, comparisons with previously approved systems, or independent calculations, determines whether the system can sustain the loss of any active component and meet minimum system requirements (cooling load and flow) for the degraded conditions. The system P&IDs, layout drawings, and component descriptions and characteristics then are reviewed for the following points: A. Essential SWS portions are identified correctly and can be isolated from nonessential portions. The P&IDs are reviewed for whether they clearly indicate both the physical division between each portion and the required