Document: NUREG-0800
Document ID: 6fd4d885-bb73-4ac0-9513-7365558c831e
Document Type: srp
Title: REACTOR AUXILIARY COOLING WATER SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550053.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.2.2
CFR Part: 
CFR Title: 

Content:
t from the reactor primary coolant system necessary to achieve a safe reactor shutdown. B. Provide essential cooling for containment components or systems like the sprays, ventilation coolers, or sump equipment. C. Cool decay heat removal equipment. D. Cool emergency core cooling pump bearings or other emergency core cooling equipment necessary to prevent or mitigate the consequences of an accident. 2. The system performance requirements section of the SAR is reviewed by the primary review organization for whether it describes allowable component operational degradation (e.g., pump leakage) and the procedures followed to detect and correct these conditions when degradation becomes excessive. 3. The primary review organization, using the results of failure-modes and effects analyses, determines whether the system can sustain the loss of any active component and, on the basis of previously-approved systems or independent calculations, whether the system meets minimum requirements (cooling load and flow) for these failure conditions. The system P&IDs, layout drawings, and component descriptions and characteristics then are reviewed for the following points: A. Essential CWS portions are identified correctly and can be isolated from the nonessential portions. The P&IDs are reviewed for whether they clearly indicate the physical division between each portion and indicate required classification changes. System drawings are reviewed for whether they show the means for accomplishing isolation, and the SAR description is reviewed for minimum performance of the isolation valves. The drawings and description are reviewed for whether automatically-operated isolation valves separate nonessential portions and components from the essential. Special consideration is given to redundant interconnected trains for operation of at least one safety-related train by proper isolation in an accident or anticipated operational occurrence. B. Essential CWS portions, including the isolation