Document: NUREG-0800
Document ID: b1bccb14-17b6-422b-93ee-6d4f00b6512b
Document Type: srp
Title: CHILLED WATER SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1510/ML15103A559.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.2.7
CFR Part: 
CFR Title: 

Content:
of failure. The means for such protection are in SAR Section 3.6, and the procedures for reviewing this information are in the corresponding SRP sections. G. Essential components and subsystems (i.e., those necessary for safe shutdown) can function as required in a LOOP and loss of instrument air systems. The system design is acceptable if essential chilled water system portions meet 9.2.7-17 Revision 0 – September 2015 minimum system requirements as stated in the SAR, assuming a concurrent LOOP and failure of a single, active component, including a single failure of any auxiliary electric power source. The SAR is reviewed for whether, for each CWS component or subsystem affected by the LOOP or loss of instrument air systems, system flow and heat transfer capability exceed minimum regulatory requirements. The results of failure-modes and effects analyses are considered for whether the system meets these regulatory requirements. This consideration is an acceptable verification of system functional reliability. 6. The system design information and drawings are analyzed by the primary review organization for whether the following features are incorporated: A. A leakage detection system to detect component or system leakage is provided. An adequate means for implementing this criterion is by the provision of sumps or drains with adequate capacity and appropriate alarms (including backup power for alarms) in the immediate area of the system. B. Components and headers of the system are designed for individual isolation capabilities to ensure system function, control system leakage, and allow system maintenance. C. Design consideration and provisions are made to address plate-type heat exchangers (also referred to as frame-type heat exchanger). Depending on the system water chemistry, chemical controls and or system filters/strainers may be required since the plate-type heat exchangers employ narrow clearances (generally in the 3 mm (0.118 inches) or less range). System