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:
lity 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 source:122 a. In accordance with Position C.3.3.5 of Regulatory Guide 1.155, the AAC power source should be capable of supplying power, as required, to all loads that are necessary for safe shutdown (non-DBA) in the event of a station blackout at any nuclear unit it is credited to serve. The AAC power source should have sufficient capacity to operate the systems necessary for coping with a station blackout for DRAFT Rev. 4 - April 1996 8.2-24 the time required to bring and maintain the plant in safe shutdown. The plant systems, functions, and features discussed in Regulatory Guide 1.155 Positions C.2 and C.3.3.1 to C.3.3.4 should be appropriately addressed as safe shutdown non-DBA loads (including loads associated with any alternative or added capacity battery charging, water, or air sources to address station blackout). For new applications, the AAC source must be of diverse design (with respect to onsite sources), be consistent with guidance described in this Appendix, have adequate capacity, independence, and reliability, and have capability for powering at least one complete set of normal safe shutdown loads. At sites where onsite emergency sources are shared between units, the AAC power sources should have the capacity and capability to ensure that all units can be brought to and maintained in safe shutdown (non-DBA). b. The AAC power source(s) is not automatically loaded for station blackout but should have provisions to be manually connected to one or all of the redundant safety buses as required. c. The performance of the AAC power source is monitored in the control room. As a minimum, monitoring should include the voltage, current, frequency, and circuit breaker position. d. The AAC source components are enclosed within structures that conform to the Uniform