Document: NUREG-0800
Document ID: ac4cde5a-7464-48b8-9067-860c672cbb68
Document Type: srp
Title: STATION BLACKOUT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550061.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.4
CFR Part: 
CFR Title: 

Content:
ce. As a minimum, monitoring should include the voltage, current, frequency, and circuit breaker position. 8.4-13 March 2007 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. 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 from a common storage tank, is acceptable if the fuel is sampled and analyzed using methods consistent with applicable standards before its transfer to the day tank. J. If the AAC power source and an emergency onsite ac power source are identical, procedures are provided to ensure that active failures of each identical power source will be evaluated for common cause applicability and that corrective action has been taken to reduce subsequent failures. K. The AAC power system is capable of operating during and after an SBO without any support system receiving power from the preferred power supply or the blacked-out unit’s EAC power sources. The capability of the AAC to start on demand depends on the