Document: NUREG-0800
Document ID: 6d6e43af-f998-40fc-9062-1277b9cebd60
Document Type: srp
Title: REACTOR AUXILIARY COOLING WATER SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350544.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.2.2
CFR Part: 
CFR Title: 

Content:
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 important to safety. The applicant should ensure that the SAR information delineates a testing and inspection program and the system drawings show the necessary test recirculation loops around pumps or isolation valves necessary for this program. f. Essential portions of the system are protected from the effects of high-energy and moderate-energy line breaks. The system description and layout drawings will be reviewed to ensure that no high- or moderate-energy piping systems are close to essential portions of the CWS, or that protection from the effects of failure will be provided. The means of providing such protection will be given in Section 3.6 of the SAR, and the procedures for reviewing this information are given in the corresponding SRP sections. g. Essential components and subsystems (i.e., those necessary