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:
d and implemented in order to provide adequate assurance that these SSCs will satisfactorily perform their safety functions. Appropriate records of the design, fabrication, erection, 9.2.7-11 Revision 0 – September 2015 and testing of SSCs important to safety shall be maintained by or under the control of the nuclear power unit licensee throughout the life of the unit. GDC 1 applies to this SRP section to ensure that SSCs important to safety being are designed, fabricated, erected and tested to quality standards commensurate with the importance of the safety functions to be performed. 2. GDC 2 requires that SSCs important to safety shall be designed to withstand the effects of natural phenomena such as earthquakes, tornadoes, hurricanes, floods, tsunami, and seiches without loss of capability to perform their safety functions. The design bases for these SSCs shall reflect: (1) Appropriate consideration of the most severe of the natural phenomena that have been historically reported for the site and surrounding area, with sufficient margin for the limited accuracy, quantity, and period of time in which the historical data have been accumulated, (2) appropriate combinations of the effects of normal and accident conditions with the effects of the natural phenomena and (3) the importance of the safety functions to be performed. The function of the CWS is to provide adequate cooling water to reactor system components, reactor shutdown equipment, ventilation equipment, ECCS components, during normal operations, anticipated operational occurrences (AOOs), and accident conditions. GDC 2 applies to this SRP section to ensure that the CWS can withstand the effects of all appropriate combinations of seismic and dynamic effects from these natural phenomena without loss of capability to perform design safety functions. GDC 2 requirements provide assurance that the CWS and its equipment can operate during the most severe historical natural phenomena combined with appropriate