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:
rmining the availability of an EDG for use as an AAC power source. (6) Emergency diesel generators with 1-out-of-2 (shared) and 2-out-of-3 (shared) ac power configurations may not be used as AAC power sources at multi-unit sites. (7) For emergency diesel generators used as an AAC source, the engine support systems should conform with the relevant criteria used to evaluate them under SRP Sections 9.5.4 through 9.5.4.123 Table 1. USE OF EDGs FOR SINGLE UNIT AND MULTI-UNIT SITES Emergency AC Power Sources Required Units Blacked AAC Power Sources Available for Safe Shutdown Out* Sources Emergency AC Power** EDGs Available for 2 dedicated 1 One unit None 3 dedicated 1 One unit One EDG 2 shared 1 All units None 3 shared 1 All units None 3 dedicated/shared 2 All units None 4 dedicated/shared 1 One unit One EDG 8.2-27 DRAFT Rev. 4 - April 1996 4 dedicated/shared 2 One unit None 4 dedicated/shared 3 All unit None 5 dedicated/shared 2 One unit One EDG 5 dedicated/shared 3 All unit None * If there are no remaining emergency ac power sources in excess of the minimum redundancy requirements, station blackout must be assumed to occur at all of the units. ** For all units at a site. Dedicated--Emergency ac power sources not shared with other units at a site. Shared--Emergency ac power sources, of which some number are capable of concurrently providing ac power to safe shutdown equipment at more than one unit at a site. 3. The reviewer verifies that sufficient information has been provided to address the following considerations and demonstrate adequate AAC source independence as follows: a. With respect to independence between the AAC power source used for station blackout and the preferred and onsite power systems, electrical ties between these systems and the physical arrangement of the interface equipment should minimize the potential for the loss of any system (i.e., preferred, onsite, or AAC) preventing access to any other system and the potential for such a loss to cause