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With Unit 3 in a refueling outage and in m … With Unit 3 in a refueling outage and in mode 5, as part of outage activities 4160V unit board transfers were in progress to return Unit 3 to 500KV offsite source, the 3B 4160V Unit Board failed to transfer. The loss of 3B 4160V Unit Board resulted in loss of power to 3EC and 3ED 4160V shutdown boards, 3B 480V shutdown board, 480V SBGT board, and 3B RPS. 3EC and 3ED diesel generators started and tied to the 4160V shutdown boards as required for loss of power. </br>Unit 3 groups 3 and 6 isolations were received as expected. An unexpected full scram was received. An invalid A IRM actuation occurred (A channel half scram) while RPS 3B bus de-energized resulting in a full scram signal. Previous to this event all control rods were already inserted.</br>This non-emergency event is reportable under 50.72(b)(3)(iv)(A)(h) - Any event or condition that results in valid actuation of emergency ac electrical power systems.</br>UNIT 3 remains in Mode 5, flooded up with fuel pool gates removed and all rods are fully inserted. 3A, 3B and 3C 4160V Unit Boards and all four shutdown boards are energized.</br>Units 1 and 2 were operating at 100% power and were not affected by the incident except for the common refuel zone isolation and temporary loss of control bay ventilation.</br>The EDGs have been restored to standby and the electrical configuration has been returned to normal.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
08:32:00, 5 May 2008 +
44,187 +
12:02:00, 5 May 2008 +
08:32:00, 5 May 2008 +
With Unit 3 in a refueling outage and in m … With Unit 3 in a refueling outage and in mode 5, as part of outage activities 4160V unit board transfers were in progress to return Unit 3 to 500KV offsite source, the 3B 4160V Unit Board failed to transfer. The loss of 3B 4160V Unit Board resulted in loss of power to 3EC and 3ED 4160V shutdown boards, 3B 480V shutdown board, 480V SBGT board, and 3B RPS. 3EC and 3ED diesel generators started and tied to the 4160V shutdown boards as required for loss of power. </br>Unit 3 groups 3 and 6 isolations were received as expected. An unexpected full scram was received. An invalid A IRM actuation occurred (A channel half scram) while RPS 3B bus de-energized resulting in a full scram signal. Previous to this event all control rods were already inserted.</br>This non-emergency event is reportable under 50.72(b)(3)(iv)(A)(h) - Any event or condition that results in valid actuation of emergency ac electrical power systems.</br>UNIT 3 remains in Mode 5, flooded up with fuel pool gates removed and all rods are fully inserted. 3A, 3B and 3C 4160V Unit Boards and all four shutdown boards are energized.</br>Units 1 and 2 were operating at 100% power and were not affected by the incident except for the common refuel zone isolation and temporary loss of control bay ventilation.</br>The EDGs have been restored to standby and the electrical configuration has been returned to normal.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
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00:00:00, 5 May 2008 +
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>.
02:14:29, 2 March 2018 +
12:02:00, 5 May 2008 +
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0.146 d (3.5 hours, 0.0208 weeks, 0.00479 months) +
08:32:00, 5 May 2008 +
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.