Document: NUREG-0800
Document ID: 50c5f9b6-d85c-4012-a8e9-48eaaafff93e
Document Type: srp
Title: CONTROL ROOM AREA VENTILATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550045.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.4.1
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CFR Title: 

Content:
ctive materials entrained in gaseous effluents will not exceed specified 10 CFR Part 20 limits for normal operation and anticipated operational occurrences. 6. 10 CFR 50.63 requires a demonstration of the capability of a nuclear power plant to withstand and recover from a station blackout (i.e., loss of offsite electric power system concurrent with reactor trip and unavailability of the onsite emergency AC electric power system). A station blackout analysis covering a minimum acceptable duration (either to withstand the event until an alternate AC source and shutdown systems are lined up for operation or to cope with it for its duration, including the recovery period) is required. RG 1.155 provides guidance for compliance with station blackout requirements. Regardless of the extent, if any, to which the CRAVS is expected to function to maintain suitable environmental conditions during a station blackout event, control room-area equipment necessary for core cooling, maintenance of appropriate containment integrity, and other functions for withstanding or coping with the event, should be able to function under the expected environmental conditions of the event. The reviewer therefore verifies that the station blackout analysis appropriately addresses the potential failures of equipment/systems during the event (e.g., loss or degraded operability of the CRAVS, as appropriate), the expected environmental conditions of the event, the operability and reliability of equipment necessary to cope with the event under the expected environmental conditions, and the habitability of plant areas requiring operator access during the event and recovery period. Those portions of the CRAVS, if any, that are identified in a coping analysis as necessary to support the functioning of equipment required to cope with the event or recovery therefrom are verified to be of sufficient capacity and capability for such support. 10 CFR 50.63 requirements provide assurance that necessary operator