Document: NUREG-0800
Document ID: 6cf2fb95-08c8-493a-b5b1-4d05d609e5c4
Document Type: srp
Title: STATION SERVICE WATER SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070512.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.2.1
CFR Part: 
CFR Title: 

Content:
tems, with each of the systems having an identical essential (safety features) portion and an identical non-essential portion (used for normal operation). For cases where there are variations from the typical arrangement, the reviewer will adjust the review procedures given below. However, the system design will be required to meet the acceptance criteria given in subsection II. Also, the reviewer will need to refer to SRP sections for other systems that would interface with the SWS. depending upon the nature and conditions of the ultimate heat sink cooling 43 water (e.g., salt water). Evaluation of various generic issues and plant-specific probabilistic risk assessments (PRAs) have shown that the loss of the SWS may be a significant contributor to the potential for a core damage accident. A review of industry experience and plant-specific PRAs is available in NUREG-1461 (Reference 11) which provides insights related to SWS vulnerabilities.44 1. The SAR is reviewed to determine that the system description and piping and instrumentation diagrams (P&IDs) show the SWS equipment that is used for normal operation, and the minimum system heat transfer and flow requirements for normal plant operation. The system performance requirements will also be reviewed to determine that it describes component allowable operational degradation (e.g., pump leakage) and describes the procedures that will be followed to detect and correct these conditions when they becaome excessive. 45 2. The reviewer, using the results of failure modes and effects analyses as appropriate, comparisons with previously approved systems, or independent calculations, determines that the system is capable of sustaining the loss of any active component and meeting minimum system requirements (cooling load and flow) for the degraded conditions. The system P&IDs, layout drawings, and component descriptions and characteristics are then reviewed for the following points: a. Essential portions of the SWS are