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:
by counting the total number of standby power supplies necessary to operate safe-shutdown equipment following a LOOP. The determination of EAC power configuration groups does not count special-purpose dedicated diesel generators, such as those associated with high-pressure core spray systems at some boiling- water reactors. C. The reliability of each EAC power source is determined in accordance with the guidance in Section C.1.1 of RG 1.155. The minimum target reliabilities of EAC power sources should be targeted at 0.95 per demand for each EDG for plants in EAC Groups A, B, and C and at 0.975 per demand for each EDG for plants in EAC Group D. D. Using the results of the above evaluations (offsite power design characteristic group, EAC power configuration group, and unit average EAC reliability values), an appropriate AMinimum Acceptable Coping Duration@ may be selected from Table 2 of RG 1.155. 2. SBO Coping Capability. The staff will review the SAR to determine that the capability to cope with an SBO lasting for the duration determined in Subsection III.1, above, 8.4-10 Revision 1- May 2010 conforms to the guidance in Section C.3.2 of RG 1.155. The review should ensure that the capability to maintain adequate core cooling and appropriate containment integrity for the specified coping duration is adequately demonstrated and appropriate procedures and training are implemented to withstand (cope with) the event. In general, two options are available to cope with an SBOCan ac-independent approach and an AAC approach. In the ac-independent approach, the plant relies on available sources of energy that are independent of ac power (e.g., process steam, dc power, and compressed air). If this approach is selected, the review should determine that an analysis conforming to the guidance in Sections C.3.2.1 to C.3.2.4 of RG 1.155 demonstrates the capability to achieve and maintain safe shutdown until ac power is restored. The AAC approach involves the provision of an