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:
RTNSS B and C components and subsystems can function as required in a LOOP and loss of instrument air systems. The system design is acceptable if the CWS meet minimum system requirements as stated in the SAR, assuming a concurrent failure of a single active component (for RTNSS B only), including a single failure of any auxiliary electric power source. Nonsafety-related SSCs that support shutdown cooling are reviewed for reliability of systems and components. X X X Section III.6.A applies. X X X Section III.6.B applies. X X Section III.6.C applies. X X Section III.6.D applies. X X Section III.6.E applies. Nonsafety-related SSCs related to refrigerant leak detection systems are reviewed. X X X Section III, Item 6F: RTNSS B or C CWS pumps are adequately designed related to net positive suction head required (NPSHr) and are evaluated against NPSH available (NPSHa) under post-72 hours periods and defense-in-depth functions. Potential CWS pump vortexing conditions are also evaluated. X X Section III, Item 7A: The failure of portions of the RTNSS B or C system or of other systems not designed to seismic Category I standards and located close to important portions of the system or of non-seismic Category I structures that house, support, or are close to important portions of the CWS should not preclude its ability to support required actions in the post-72 hours period or defense-in-depth functions. The review identifies these non-seismic category components or piping and ensures appropriate provision of isolation capabilities in failure. Reference to SAR Chapter 2, describing site features and the general arrangement and layout drawings, is necessary, as well as the SAR tabulation of seismic design X X 9.2.7-23 Revision 0 – September 2015 Review Procedure: RTNSS B RTNSS C All Other Nonsafety-Related classifications for structures and systems. Section III, Item 7B: CWS portions are protected from the effects of floods, hurricanes, tornadoes, and internally or