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:
the SBO, including possible effects of fire protection systems iii. Potential effects of other hazards, such as weather, on SBO response equipment (e.g., auxiliary equipment to operate onsite buses or to recover EDGs and other equipment as needed) iv. Potential habitability concerns for those areas that would need operator access during the SBO and recovery period J. Equipment will be considered acceptable for SBO temperature environments if an assessment has been performed that provides reasonable assurance that the necessary equipment will remain operable. K. In general, equipment necessary to cope with an SBO during the first 8 hours should be available on site. Consideration should be given to the availability and accessibility of offsite equipment in the time required, including consideration of weather conditions likely to prevail during a LOOP. L. Consideration should be given to timely operator actions inside or outside the control room that would increase the length of time that the plant can cope with an SBO, provided it can be demonstrated that these actions can be carried out in a timely fashion. For example, if station battery capacity is a limiting factor in coping with an SBO, shedding nonessential loads on the batteries could extend the time until the battery is depleted. If load shedding or other operator actions are considered, the plant-specific technical guidelines and emergency operating procedures should incorporate corresponding procedures. Load shedding should not commence during the first 30 minutes of the SBO event. M. The ability to maintain appropriate containment integrity should be addressed. Appropriate containment integrity for SBO means that adequate containment integrity is ensured by providing the capability, independent of the preferred and blacked-out unit’s onsite EAC power supplies, for valve position indication and closure for containment isolation valves that may be in the open position at the onset of an SBO. This does not