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:
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 VWS 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 VWS 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 VWS and its equipment can operate during the most severe historical natural phenomena combined with appropriate normal 9.2.7-13 Draft Revision 0 – July 2014 operations and accident conditions without loss of capability to perform intended safety functions. Note: RTNSS B SSCs are designed to withstand the effects of natural phenomena without loss of function. RTNSS C SSCs are evaluated, utilizing the “graded approach philosophy,” against