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On October 11, 2004, at 1057 (hrs. EDT) , … On October 11, 2004, at 1057 (hrs. EDT) , while performing modification work to support security upgrades, the radio system controller that activates the plant offsite warning system was removed from service during a pre-planned activity. At 1148, the system was rebooted but failed to perform correctly. Approximately 70 % of the sirens were communicating with the system, while plant procedures direct that less than 75 % of the offsite warning system meets the reporting threshold. At 1226, the offsite warning system capability was restored to greater than 75%.</br>Since the removal of the offsite notification network from service was a planned evolution, the county, state and the NRC resident inspector were notified prior to the removal from service. Appropriate compensatory measures were taken by the state and local agencies.</br>The cause of the event was the new Federal Signal activation frequency not reloading after the outage since it was not hard-coded into the software for the radio system controller. This caused all 27 of the Federal Signal sirens from being activated. Three other sirens had pre-existing conditions which made 30 sirens inoperable out of a total of 106.</br>The correct information was loaded into the software via modem and a silent siren test confirmed 93% capability at 1226. The frequency information was hard coded into the software to prevent future occurrences.</br>The licensee notified state/local agencies and the NRC resident inspector.l agencies and the NRC resident inspector. +
14:57:00, 11 October 2004 +
41,114 +
13:51:00, 11 October 2004 +
14:57:00, 11 October 2004 +
On October 11, 2004, at 1057 (hrs. EDT) , … On October 11, 2004, at 1057 (hrs. EDT) , while performing modification work to support security upgrades, the radio system controller that activates the plant offsite warning system was removed from service during a pre-planned activity. At 1148, the system was rebooted but failed to perform correctly. Approximately 70 % of the sirens were communicating with the system, while plant procedures direct that less than 75 % of the offsite warning system meets the reporting threshold. At 1226, the offsite warning system capability was restored to greater than 75%.</br>Since the removal of the offsite notification network from service was a planned evolution, the county, state and the NRC resident inspector were notified prior to the removal from service. Appropriate compensatory measures were taken by the state and local agencies.</br>The cause of the event was the new Federal Signal activation frequency not reloading after the outage since it was not hard-coded into the software for the radio system controller. This caused all 27 of the Federal Signal sirens from being activated. Three other sirens had pre-existing conditions which made 30 sirens inoperable out of a total of 106.</br>The correct information was loaded into the software via modem and a silent siren test confirmed 93% capability at 1226. The frequency information was hard coded into the software to prevent future occurrences.</br>The licensee notified state/local agencies and the NRC resident inspector.l agencies and the NRC resident inspector. +
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100 +
00:00:00, 11 October 2004 +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
02:22:34, 2 March 2018 +
13:51:00, 11 October 2004 +
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14:57:00, 11 October 2004 +
URL"URL" is a <a href="/Special:Types/URL" title="Special:Types/URL">type</a> and predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> to represent URI/URL values.