Document: NUREG-0800
Document ID: 5cdeed4a-6cd5-4840-90c0-5159fbf2c9f0
Document Type: srp
Title: CHILLED WATER
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1409/ML14093A350.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.2.7
CFR Part: 
CFR Title: 

Content:
tem can sustain the loss of any active component and, on the basis of previously approved systems or independent calculations, whether the system meets minimum requirements (cooling load and flow) for these failure conditions. The system piping and instrumentation diagrams P&IDs, layout drawings, and component descriptions and characteristics then are reviewed for the following points: A. Chilled water system portions are identified correctly and can be isolated from the non-essential portions. The P&IDs are reviewed for whether they clearly indicate the physical division between each portion and indicate required classification changes. System drawings are reviewed for whether they show the means for accomplishing isolation, and the SAR description is reviewed for minimum performance of the isolation valves. The drawings and description are reviewed for whether automatically operated isolation valves separate non-essential portions and components from the essential. Special consideration is given to redundant interconnected trains for operation of at least one safety-related train by proper isolation in an accident or anticipated operational occurrence. RTNSS B: applies, since RTNSS B SSCs are considered risk-significant. Replace item 5. A (above) with the following: Important chilled water system portions are identified correctly and can be isolated from the non-essential portions. The P&IDs are reviewed for whether they clearly indicate the physical division between each portion and indicate required classification changes. System drawings are reviewed for whether they show the means for accomplishing isolation, and the SAR description is reviewed for minimum performance of the isolation valves. The drawings and description are reviewed for whether automatically operated isolation valves separate non-RTNSS portions and components from the RTNSS components. RTNSS C: applies for defense-in-depth functions in order to meet NRC safety goal guidelines. Replace