![]() ![]() ![]() ![]() At single unit sites, any emergency ac power source(s) in excess of the number required to meet minimum redundancy requirements ( i.e., single failure) for safe shutdown (non-DBA) is assumed to be available and may be designated as an alternate power source(s) provided the applicable requirements are met. Station blackout does not include the loss of available ac power to buses fed by station batteries through inverters or by alternate ac sources as defined in this section, nor does it assume a concurrent single failure or design basis accident. Station blackout means the complete loss of alternating current (ac) electric power to the essential and nonessential switchgear buses in a nuclear power plant ( i.e., loss of offsite electric power system concurrent with turbine trip and unavailability of the onsite emergency ac power system). ![]()
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