Document: NUREG-0800
Document ID: ac4cde5a-7464-48b8-9067-860c672cbb68
Document Type: srp
Title: STATION BLACKOUT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550061.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.4
CFR Part: 
CFR Title: 

Content:
ching 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 backup sources to the CST in order of intended use. In addition, plant operating procedures should specify clear criteria for transferring to the next preferred source of water. I. The procedure should identify individual loads that need to be stripped from the plant dc buses (both Class 1E and non-Class 1E) to conserve dc power. J. Plant operating procedures should specify actions to permit appropriate containment isolation and safe-shutdown valve operations while ac power is unavailable. 8.4-16 March 2007 K. Plant operating procedures should identify the portable lighting necessary for ingress and egress to plant areas containing shutdown or AAC equipment requiring manual operation. L. Plant operating procedures should consider the effects of ac power loss on area access, as well as the need to gain entry to other locked areas where