Document: NUREG-0800
Document ID: e47fd320-f3af-41cd-883e-a51e0949005d
Document Type: srp
Title: to verify that the AAC source (or sources) will not adversely affect the
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1007/ML100740424.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.2
CFR Part: 
CFR Title: 

Content:
on should be made of the physical arrangement of circuits and incoming source breakers (to the affected Class 1E bus or buses), separation and isolation provisions (control and main power), permissive and interlock schemes proposed for source breakers, source initiation/transfer logic, Class 1E load shedding and sequencing schemes that could affect AAC source ability to power safe-shutdown loads, source lockout schemes, and bus lockout schemes. C. The AAC power source(s) is not automatically loaded for SBO but should have provisions to be manually connected to one or all of the redundant safety buses as necessary. D. Plant staff in the control room monitor the performance of the AAC power source. As a minimum, monitoring should include the voltage, current, frequency, and circuit breaker position. E. The AAC source components are enclosed within structures that conform to the Uniform Building Code. Electrical cables connecting the AAC power source to the shutdown buses are protected against the events that affect the preferred ac power system. Buried cables or other appropriate methods can be used to accomplish this. F. Nonsafety-related AAC power source(s) and associated dedicated dc system(s) should meet the QA guidance in Section 3.5, Appendix A, and Appendix B to RG 1.155. 8.4-15 Revision 1- May 2010 G. The AAC power system is equipped with a dedicated dc power system that is electrically independent from the blacked-out unit=s preferred and Class 1E power systems and is of sufficient capability and capacity for operation of dc loads associated with the AAC source for the maximum necessary duration of AAC source operation. H. The AAC power system is equipped with a starting system (and motive energy source for starting) that is independent from the blacked-out unit=s preferred and Class 1E ac power systems. I. The AAC power system is provided with a fuel supply that is separate from the fuel supply for the onsite EAC power system. A separate day tank, supplied