Document: NUREG-0800
Document ID: e47fd320-f3af-41cd-883e-a51e0949005d
Document Type: srp
Title: to verify that the AAC source (or sources) will not adversely affect the
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1007/ML100740424.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.2
CFR Part: 
CFR Title: 

Content:
remaining unit(s) should still meet the normal operating single failure criteria. Therefore, an EDG could be designated as an AAC only if (1) the EDG is neither the necessary EAC power source nor the redundant EAC power source for the unit experiencing the SBO and (2) the EDG is not necessary as an emergency or redundant EAC power source for the remaining units. Where an EDG is used as an AAC, it is desirable that the EDG be connectable to all buses essential for normal safe shutdown. Review of the applicant=s station onsite ac power system should determine whether such a capability exists. v. Multiunit sites may not use EDGs with 1-out-of-2 (shared) and 2-out-of-3 (shared) ac power configurations as AAC power sources. vi. For EDGs 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 9.5.8. 4. Procedures and Training. The staff will review procedures and training to ensure that they conform to the guidance in Sections C.1.3, C.2, and C.3.4 and Appendix B to RG 1.155 and include all operator actions necessary to do the following: 8.4-17 Revision 1- May 2010 A. Cope with the occurrence of an SBO for the specified coping duration during all modes of plant operation and include actions necessary to place AAC power sources in service (if used) and maintain acceptable environmental conditions for equipment necessary to mitigate the event. Procedures developed to cope with an SBO should be integrated with the plant-specific technical guidelines and emergency operating procedures developed using the emergency operating procedure upgrade program established in response to Supplement 1 of NUREG-0737. The task analysis portion of the emergency operating procedure upgrade program should include an analysis of instrumentation adequacy during an SBO. B. Restore standby (Class 1E) power sources when the EAC power system is unavailable. C. Restore offsite power sources and use of nearby