Document: NUREG-0800
Document ID: a2680f96-0e15-402d-89ab-688ff09806a8
Document Type: srp
Title: with respect to the specified station blackout event/duration.13
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070497.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.2
CFR Part: 
CFR Title: 

Content:
egulatory Guide 1.155, as supplemented by the guidance and criteria herein, is being implemented. To assure that the requirements of 10 CFR 50.63 regarding the AAC source are satisfied, the licensee's submittal on station blackout is evaluated and verified to address the following issues:120 1. If an alternate ac power source (AAC) is selected specifically for satisfying the requirements for station blackout, the design should meet the criteria of Positions C.3.2.5, C.3.3, C.3.5 and Appendices A and B of Regulatory Guide 1.155. AAC power sources may be emergency diesel generators (EDG) in excess of minimum redundancy requirements for nuclear power plant onsite power systems; nearby or onsite gas turbine generators; portable or other available compatible diesel generators; hydrogenerators; or black-start-capable fossil fuel power plants. In general, equipment required to cope with a station blackout during the first 8 hours should be available onsite. Consideration should be given to the availability and accessibility of offsite equipment in the time required, including consideration of weather conditions likely to prevail during a loss of offsite power. In accordance with Regulatory Guide 1.155 Position C.3.3.5.3, the AAC power source should be available in a timely manner after the onset of station blackout and have provisions to be manually connected to one or all of the redundant safety buses as required. The time required for making this equipment available should not be more than 1 hour as demonstrated by test. Where an AAC is demonstrated by test to be available within 10 minutes of the onset of a station blackout event, no coping analysis is required; however, supporting information should show that the AAC has the capability, capacity, independence, and reliability to bring and maintain the plant in safe shutdown (non-DBA).121 2. The reviewer should verify that the provisions for the AAC source meet the following criteria, as applicable for the proposed AAC