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:
to withstand the effects of natural phenomena without loss of function. RTNSS C SSCs are evaluated, utilizing the “graded 9.2.7-11 Draft Revision 0 – July 2014 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 SSCs may be designed against the effects of natural phenomena. SRP Section 19.3 provides further guidance related to the reliability and availability missions of RTNSS B and C SSCs. 3. Environmental and Dynamic Effects. Information that addresses the requirements of GDC 4 regarding consideration of environmental and dynamic effects will be considered acceptable if the acceptance criteria in the following SRP sections, as they apply to the VWS, are met: SRP Sections 3.5.1.1, 3.5.1.4, 3.5.2, and 3.6.1. In addition, the information will be considered acceptable if the design provisions presented in Generic Letter (GL) 96-06 and GL 96-06, Supplement 1 are appropriately addressed. Note: RTNSS B SSCs are analyzed and designed to withstand adverse effects associated with internal hazards, i.e., those created from conditions inside the plant (e.g., turbine missiles, pipe whip, and flooding). 4. Sharing of SSCs. Information that addresses the requirements of GDC 5 regarding the capability of shared systems and components important to safety to perform required safety functions will be considered acceptable if the use of the VWS in multiple unit plants during an accident in one unit does not significantly affect the capability to conduct a safe and orderly shutdown and cool down in the unaffected unit(s). 5. Cooling Water System. Information that addresses the requirements of GDC 44 regarding consideration of the cooling water system will be considered acceptable if the VWS and its components will continue to perform their required safety functions, assuming a single active failure or a moderate-energy line crack as defined in BTP 3-3 and to seismic