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:
ost. Surge tank leakage over a 7 day period should include the possibility of valve seat leakage for CWS system boundaries, CWS pump seal leakage, equipment gaskets, and general valve packing leakage. Long term water surge tank manual makeup should be available post 7 days for up to 30 days from non-seismic category I sources. Surge tanks are to be designed with instrumentation to determine overall system leakage if a safety related seismic category I makeup system is not utilized. 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. D. The system is designed for removal of heat loads during normal operation and for CWS heat loads during accident conditions with the appropriated design margins (including considerations for heat exchanger tube plugging and fouling) for adequate operations. A comparative analysis is made of the system flow rates, heat levels, maximum temperature, and heat removal capabilities with similar designs previously found acceptable. An independent analysis may verify system performance characteristics. E. Design provisions permit appropriate in-service inspection and functional testing of system components important to safety. The SAR information delineates a testing and inspection program, and the system drawings show the necessary test recirculation loops around pumps or isolation valves necessary for this program. F. Essential portions of the system are protected from the effects of high-energy and moderate-energy line breaks. The system description and layout drawings are reviewed (if available) for whether no high or moderate-energy piping systems are close to essential chilled water portions, or for protection from the effects 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.,