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:
e 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 “Minimum 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, 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 SBO—an 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 8.4-9 March 2007 restored. The AAC approach involves the provision of an independent AAC power source. If this approach is selected, the review should ensure that the design conforms to the recommendations in Sections C.3.2.5, C.3.3, and C.3.5 and Appendices A and B to RG 1.155, as described in Subsection III.3 below. Except for passive ALWR plant designs (such as the AP1000), an AAC power source that is fully capable of powering one complete set of