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:
nt 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 valves separating seismic Category I portions from the nonseismic, are Quality Group C and seismic Category I. System design bases and criteria and the component classification tables are reviewed for whether the heat exchangers, pumps, valves, and piping of essential system portions are designed to seismic Category I requirements in accordance with the applicable criteria. The review of seismic design and quality group classification is as indicated in subsection I of this SRP section. C. The system is designed to provide water makeup as necessary. Closed-loop CWSs are reviewed for whether the surge tanks have sufficient capacity to accommodate expected leakage from the system for seven days or whether a seismic source of makeup can be made available within a time frame consistent with the surge tank capacity (time zero starts at low level alarm). The surge tank and connecting piping are reviewed for whether makeup water can be supplied to either header in a split header system. Redundant surge tanks (one to each 9.2.2-10 Revision 4 - March 2007 header) or a divided surge tank design is acceptable to ensure that in a header rupture, the entire contents of the surge tank are not lost. D. The system is designed for removal of heat loads during normal operation and for emergency core cooling heat loads during accident conditions with appropriate design margins for adequate operation. A comparative analysis is made of the system flow rates, heat levels, maximum temperature, and heat removal capabilities with similar designs previously found acceptable. An independent analysis may verify system performance characteristics. E. Design provisions permit appropriate inservice inspection and functional testing of system components important to safety. The SAR information