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 Entered dateEvent description
ENS 4129526 December 2004 12:48:00At 0804 hours EST, on December 26, 2004, at the H. B. Robinson Steam Electric Plant (HBRSEP), Unit No. 2, a partial loss of non-vital offsite power occurred causing the inoperability of the Emergency Response Facility Information (ERFIS) computer system for greater than one hour. The ERFIS computer system provides monitoring and communications capability for plant data systems including the Emergency Response Data System (ERDS), among others. At 0852, the remaining non-vital offsite power was lost resulting in the disabling of the primary Emergency Operating Facility (EOF). The off-site alternate EOF remained operational. Power to the primary EOF was restored at 0913 and the ERFIS computer system was restored to operable status at 1010 hours on December 26, 2004. As required by plant procedures, appropriate assessment of plant conditions, notifications, and communications could still have been made through alternate methods during the time that the ERFIS computer system was inoperable. This report is being made in accordance with 10 CFR 50.72(b)(3)(xiii), which is any event that results in a major loss of emergency assessment capability, offsite response capability, or offsite communications capability. As previously stated, alternate means remained available to assess plant conditions, make notifications, and accomplish required communications, as necessary. The licensee notified the NRC Resident Inspector.