Document: NUREG-0800
Document ID: 2200e046-1749-4aa1-a474-997b369b63b2
Document Type: srp
Title: REACTOR AUXILIARY COOLING WATER SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070513.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.2.2
CFR Part: 
CFR Title: 

Content:
nt of a loss of offsite power and instrument air systems. The system design will be acceptable in this regard if the essential portions of the CWS meet minimum system requirements as stated in the SAR assuming a concurrent failure of a single active component, including a single failure of any auxiliary electric power source. The SAR is reviewed to determine that for each CWS component or subsystem affected by the loss of offsite power or instrument air systems, system flow and heat transfer capability exceed minimum requirements. The results of failure-modes and -effects analyses are considered in ensuring that the system meets these requirements. This will be an acceptable verification of system functional reliability. The effects of loss of 9.2.2-13 DRAFT Rev. 4 - April 1996 cooling water to RCP seals as a result of loss of power will be reviewed as indicated in Task Action Plan items II.K.2.16 and II.K.3.25 of NUREGs-07I8 and 0737.10 CFR 50.34(f)(1)(iii) and clarified in subsection III.4.e of this SRP section.61 4. The system design information and drawings are analyzed to ensure that the following features will be incorporated. a. A leakage detection system is provided to detect component or system leakage. An adequate means for implementing this criterion is to provide sumps or drains with adequate capacity and appropriate alarms in the immediate area of the system. b. Components and headers of the system are designed to provide individual isolation capabilities to ensure system function, control system leakage, and allow system maintenance. c. Design provisions are made to ensure the capability to detect leakage of radioactivity or chemical contamination from one system to another. Radioactivity monitors and conductivity monitors should be located in the system component discharge lines to detect leakage. An alternative means is to prevent leakage from occurring by operating the system at higher pressure to ensure that leakage is in the preferred direction.