Document: NUREG-0800
Document ID: b5ea3f55-f54e-45cf-b921-3944d12b4ce2
Document Type: srp
Title: REACTOR AUXILIARY COOLING WATER SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350545.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.2.2
CFR Part: 
CFR Title: 

Content:
y coolant system necessary to achieve a safe reactor shutdown. b. Provide essential cooling for containment components or systems such as the sprays, ventilation coolers, or sump equipment. c. Provide cooling for decay heat removal equipment. d. Provide cooling for 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 is reviewed to determine that it describes allowable component operational degradation (e.g., pump leak- age) and describes the procedures that will be followed to detect and correct these conditions when degradation becomes excessive. 3. The reviewer, using the results of failure-modes and -effects analyses, determines that the system is capable of sustaining the loss of any active component and, on the basis of previously approved systems or independent calculations, that the minimum system requirements (cooling load and flow) are met for these failure conditions. The system P&IDs, layout drawings, and component descriptions and characteristics are then reviewed for the following points: a. Essential portions of the CWS are correctly identified and are isol- able from the nonessential portions of the system. The P&IDs are -eviewed to verify that they clearly indicate the physical division between each portion and indicate required classification changes. System drawings are reviewed to see that they show the means for accomplishing isolation and the SAR description is reviewed to identify minimum performance of the isolation valves. The drawings and description are reviewed to verify that automatically operated isolation valves separate nonessential portions and components from the essential portions. b. Essential portions of the CWS, including the isolation valves separating seismic Category I portions from the nonseismic portions, are Quality Group C and seismic Category I. System design bases and criteria, and