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:
cted by the LOOP or loss of instrument air systems, system flow and heat transfer capability exceeds minimum requirements. Nonsafety-related nonrisk-significant: may apply. SSCs that support achieving and maintaining cold shutdown conditions in the post-72 hour period should be designed to be reliable. Replace paragraph 5.G with the following: The design functions that support achieving and maintaining CSD are reviewed for reliability of systems and components. 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. RTNSS B and C: applies. Nonsafety-related nonrisk-significant: applies. 9.2.7-22 Draft Revision 0 – July 2014 B. Components and headers of the system are designed for individual isolation capabilities to ensure system function, control system leakage, and allow system maintenance. RTNSS B and C: applies. 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 leakage and radiological considerations are reviewed due to the large number of gaskets utilized in the design of the plate-type heat exchangers (Ref. 24). The effects of chemical controls are reviewed by the secondary review organization. RTNSS B: applies for nonsafety-related functions in the post-72 hour period. RTNSS C: applies for nonsafety-related defense-in-depth functions in order to meet NRC safety goal