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:
rtions 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 the component classification tables are reviewed to verify that the heat exchangers, pumps, valves, and piping of essen- tial portions of the system will be designed to seismic Category I requirements in accordance with the applicable criteria. The review of seismic design is performed by SGEB and the review for seismic and 9.2.2-6 Rev. 2 - April 1984 quality group classification is performed by MEB as indicated in sub- section I of this SRP section. c. The system is designed to provide water makeup as necessary. Cooling water systems that are closed loop systems are reviewed to ensure that the surge tanks have sufficient capacity to accommodate expected leakage from the system for seven days or that 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 to ensure that makeup water can be supplied to either header in a split header system. Redundant surge tanks (one to each header) or a divided surge tank design are acceptable to ensure that in the event of a header rupture, the loss of the entire contents of the surge tank will not occur. d. The system is designed for removal of heat loads during normal opera- tion and of emergency core cooling heat loads during accident condi- tions, with appropriate design margins to ensure 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. To verify performance characteristics of the system, an independent analysis may be made. e. Design provisions are made that permit appropriate inservice inspec- tion and functional testing of system components