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:
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 power sources (which may include nearby or onsite gas turbine generators, portable generators, hydrogenerators, and black start fossil power plants) in the event of a LOOP. As a minimum, the reviewer should consider the following potential causes for a LOOP: i. Grid undervoltage and collapse. ii. Weather-induced power loss. iii. Preferred power distribution system faults that could result in the loss of normal power to essential switchgear buses. This includes such failures as distribution system hardware, switching and maintenance errors, and lightning-induced faults. D. Actions necessary to restore normal long-term core cooling/decay heat removal once ac power is restored. In addition, the reviewer should determine that plant operating procedures developed to respond to an SBO event are consistent with the following general guidelines: E. The procedure should specify actions necessary to assure that shutdown equipment (including support systems) necessary in an SBO can operate without ac power. F. The procedure should recognize the importance of decay heat removal systems (auxiliary feedwater, high-pressure coolant injection, high-pressure core spray, reactor core isolation cooling) during the early stages of the event and direct operators to invest appropriate attention to ensuring their continued reliable operation throughout the event. G. Plant operating procedures should identify the sources of potential inventory loss and specify actions to prevent or limit significant loss. H. Plant operating procedures should ensure the prompt establishment of a flowpath for makeup flow from the CST to the steam generator/nuclear boiler and identify 8.4-18 Revision 1- May 2010 backup sources to the CST in order of intended use. In addition, plant operating procedures should