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:
arly 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. X X Section III, Item 5B: RTNSS B portions of the CWS meet seismic Category II design requirements. System design bases and criteria and the component classification tables are reviewed for whether the heat exchangers, pumps, valves, and piping of important system portions are designed to seismic Category II requirements in accordance with the applicable design criteria. The review of seismic design and quality group classification is as indicated in Subsection I of this SRP section. RTNSS C may provide for defense-in-depth cooling and heat transfer functions in order to meet NRC safety goal guidelines. RTNSS C SSCs are evaluated, utilizing the “graded approach philosophy,” against the effects of the most probable hazards (e.g., floods, winds, missiles, seismic events). As a result of this evaluation, RTNSS C may be designed against the effects of natural phenomena. X X 9.2.7-21 Revision 0 – September 2015 Review Procedure: RTNSS B RTNSS C All Other Nonsafety-Related Section III, Item 5C: The RTNSS B or C system is designed to provide water makeup as necessary. Closed loop CWSs are reviewed for whether the surge tanks have sufficient capacity to accommodate expected leakage. Automatic or manual makeup operation may be required. Surge tanks are to be designed with instrumentation to determine overall system leakage. Surge tanks are designed for normal system and abnormal in-leakage contractions and expansion without radiological consequences such as spills of CWS to the floor. X X Section III, Item 5D: The RTNSS B or C system