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On July 28, 2009, TVA identified, in the C … On July 28, 2009, TVA identified, in the Corrective Action Program, the potential to overtop and fail earthen embankments at Cherokee, Fort Loudoun, Tellico, and Watts Bar Dams. This condition could have resulted in an increase in the probable maximum flood (PMF) level at Watts Bar Unit 1. TVA initiated immediate actions to address the condition by conducting additional analyses and the development of contingent actions. Additional actions were developed including the installation of modular flood barriers (which were) completed in December 2009. The barriers increase the effective height of the affected embankments preventing their overtopping and failure. The increase in PMF could have affected plant equipment including the emergency diesel generator system, the essential raw cooling water system, the thermal barrier booster pumps and the control room chillers. </br>Additional details regarding the modular flood barriers and the results of TVA's subsequent hydrologic analyses for Watts Bar were discussed in public meetings between TVA and the NRC staff on July 7, 2010 and May 31, 2012, and provided in TVA letters to the NRC dated July 19, 2012, October 30, 2012 and January 18, 2013.</br>This report addresses a condition as described in 10 CFR 50.72(b)(3)(ii)(B). Affected safety related equipment is currently operable.</br>The NRC Resident Inspector has been notified of this condition.</br>See related event notifications from Browns Ferry (EN #48724) and Sequoyah (EN #48725).erry (EN #48724) and Sequoyah (EN #48725). +
05:00:00, 28 July 2009 +
48,723 +
16:00:00, 6 February 2013 +
05:00:00, 28 July 2009 +
On July 28, 2009, TVA identified, in the C … On July 28, 2009, TVA identified, in the Corrective Action Program, the potential to overtop and fail earthen embankments at Cherokee, Fort Loudoun, Tellico, and Watts Bar Dams. This condition could have resulted in an increase in the probable maximum flood (PMF) level at Watts Bar Unit 1. TVA initiated immediate actions to address the condition by conducting additional analyses and the development of contingent actions. Additional actions were developed including the installation of modular flood barriers (which were) completed in December 2009. The barriers increase the effective height of the affected embankments preventing their overtopping and failure. The increase in PMF could have affected plant equipment including the emergency diesel generator system, the essential raw cooling water system, the thermal barrier booster pumps and the control room chillers. </br>Additional details regarding the modular flood barriers and the results of TVA's subsequent hydrologic analyses for Watts Bar were discussed in public meetings between TVA and the NRC staff on July 7, 2010 and May 31, 2012, and provided in TVA letters to the NRC dated July 19, 2012, October 30, 2012 and January 18, 2013.</br>This report addresses a condition as described in 10 CFR 50.72(b)(3)(ii)(B). Affected safety related equipment is currently operable.</br>The NRC Resident Inspector has been notified of this condition.</br>See related event notifications from Browns Ferry (EN #48724) and Sequoyah (EN #48725).erry (EN #48724) and Sequoyah (EN #48725). +
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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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1,289.417 d (30,946 hours, 184.202 weeks, 42.39 months) +
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