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On March 5, 2008, at 1312 CST, fifteen (15 … On March 5, 2008, at 1312 CST, fifteen (15) emergency notification system sirens in the Fort Calhoun Station Emergency Planning Zone (eleven in Harrison County, Iowa, four in Pottawattamie County, Iowa) were de-energized due to a un-planned power outage. The loss of AC Power to these emergency notification sirens impacted 15 of 101 total sirens; 8 of which had DC Battery Backup Power. As a result, this event is being reported under 10 CFR 50.72 (b)(3)(xiii) and guidance in NUREG-1022 as a major loss of off-site communications capability (e.g. offsite notification system).</br>Power was restored to 8 sirens, 4 in Harrison County and all 4 from Pottawattamie County on March 5, 2008 at 1413 hours. One siren in Harrison County was restored at 1417 hours. The remaining 6 sirens were restored at 1529 hours. The power loss was determined to be due to a farm equipment malfunction.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
06:00:00, 5 March 2008 +
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20:15:00, 5 March 2008 +
06:00:00, 5 March 2008 +
On March 5, 2008, at 1312 CST, fifteen (15 … On March 5, 2008, at 1312 CST, fifteen (15) emergency notification system sirens in the Fort Calhoun Station Emergency Planning Zone (eleven in Harrison County, Iowa, four in Pottawattamie County, Iowa) were de-energized due to a un-planned power outage. The loss of AC Power to these emergency notification sirens impacted 15 of 101 total sirens; 8 of which had DC Battery Backup Power. As a result, this event is being reported under 10 CFR 50.72 (b)(3)(xiii) and guidance in NUREG-1022 as a major loss of off-site communications capability (e.g. offsite notification system).</br>Power was restored to 8 sirens, 4 in Harrison County and all 4 from Pottawattamie County on March 5, 2008 at 1413 hours. One siren in Harrison County was restored at 1417 hours. The remaining 6 sirens were restored at 1529 hours. The power loss was determined to be due to a farm equipment malfunction.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
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