Document: NUREG-0800
Document ID: 33d57664-26a3-4d30-807d-2ce020de062a
Document Type: srp
Title: STATION BLACKOUT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1007/ML100740424.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.4
CFR Part: 
CFR Title: 

Content:
as the AP1000) that (a) do not need ac power to perform safety-related functions for 72 hours following the onset of an SBO and (b) meet the guidelines in Section C.IV.10 of RG 1.206 regarding RTNSS. 8.4-13 Revision 1- May 2010 EDGs in excess of minimum redundancy criteria for NPP onsite power systems, nearby or onsite gas turbine generators, portable or other available compatible diesel generators, or hydrogenerators may serve as AAC power sources. The design should meet the recommendations in Sections C.3.2.5, C.3.3, and C.3.5 and Appendices A and B to RG 1.155. It is acceptable for AAC power sources to be normally used for other purposes and they do not need to be solely dedicated to use as an AAC power source. However, the requisite procedures and interface agreements need to be in place such that the AAC power source is available in an SBO event. The AAC power source should be available in a timely manner after the onset of SBO and have provisions to be manually connected to one or all of the redundant safety buses as necessary to power all equipment necessary to achieve and maintain safe shutdown (non-DBA). The time necessary for making this equipment available should not exceed 1 hour and should be demonstrated by test. If tests can show the AAC power source to be available in less than 10 minutes, no coping analysis is needed. Otherwise, a coping analysis should be performed for the duration from the onset of the SBO until the AAC power source or sources are started and lined up to operate all equipment necessary to achieve and maintain safe shutdown. The phrase Aavailable within 10 minutes of the onset of SBO@ means that circuit breakers necessary to bring power to safe-shutdown buses can be actuated in the control room within that period. To ensure that the requirements of 10 CFR 50.63 regarding the AAC source are satisfied, the staff will evaluate and verify the applicant=s submittal on SBO regarding the following issues: A. In accordance with Section