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On October 16, 2012, Watts Bar Nuclear Pla … On October 16, 2012, Watts Bar Nuclear Plant Unit 1 experienced a momentary loss of power to the 1B 6.9 KV Shutdown board. This resulted in an emergency start of all 4 Emergency Diesel Generators due to actuation of the designed undervoltage EDG start signal. A manual transfer of the shutdown board from the Normal power supply to the Alternate was in progress to support maintenance. The momentary loss of power lasted approximately 2 seconds, which caused load shed and Diesel Generator start to occur. </br>Core cooling was maintained throughout the transient. </br>This condition is being reported under 10 CFR 50.72 (b)(3) (iv) (A).</br>All safety systems responded as designed. The unit remains stable in Mode 5.</br>The cause for this failure is not yet known. Investigation is in progress.</br>The NRC Senior Resident has been notified.The NRC Senior Resident has been notified. +
03:30:00, 17 October 2012 +
05:46:00, 17 October 2012 +
03:30:00, 17 October 2012 +
On October 16, 2012, Watts Bar Nuclear Pla … On October 16, 2012, Watts Bar Nuclear Plant Unit 1 experienced a momentary loss of power to the 1B 6.9 KV Shutdown board. This resulted in an emergency start of all 4 Emergency Diesel Generators due to actuation of the designed undervoltage EDG start signal. A manual transfer of the shutdown board from the Normal power supply to the Alternate was in progress to support maintenance. The momentary loss of power lasted approximately 2 seconds, which caused load shed and Diesel Generator start to occur. </br>Core cooling was maintained throughout the transient. </br>This condition is being reported under 10 CFR 50.72 (b)(3) (iv) (A).</br>All safety systems responded as designed. The unit remains stable in Mode 5.</br>The cause for this failure is not yet known. Investigation is in progress.</br>The NRC Senior Resident has been notified.The NRC Senior Resident has been notified. +
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00:00:00, 17 October 2012 +
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>.
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03:30:00, 17 October 2012 +
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.