ENS 48724: Difference between revisions
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| event date = 07/28/2009 CST | | event date = 07/28/2009 CST | ||
| last update date = 02/06/2013 | | last update date = 02/06/2013 | ||
| title = Unanalyzed Condition That Could Have Resulted | | title = Unanalyzed Condition That Could Have Resulted in an Increased Maximum Flood Level | ||
| event text = 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. Prior Browns Ferry Nuclear (BFN) analysis did not consider the potential to overtop and fail the earthen embankments at Cherokee Dam. This condition could have resulted in an increase in the probable maximum flood (PMF) level at Browns Ferry Nuclear Plant Units 1, 2 and 3. TVA initiated immediate actions to address the condition by conducting additional analyses and developing 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. | | event text = 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. Prior Browns Ferry Nuclear (BFN) analysis did not consider the potential to overtop and fail the earthen embankments at Cherokee Dam. This condition could have resulted in an increase in the probable maximum flood (PMF) level at Browns Ferry Nuclear Plant Units 1, 2 and 3. TVA initiated immediate actions to address the condition by conducting additional analyses and developing 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. | ||
Additional details regarding the modular flood barriers and the results of TVA's subsequent hydrologic analyses were discussed in a public meeting between TVA and the NRC staff on July 7, 2010. | Additional details regarding the modular flood barriers and the results of TVA's subsequent hydrologic analyses were discussed in a public meeting between TVA and the NRC staff on July 7, 2010. | ||
Latest revision as of 22:01, 1 March 2018
| Where | |
|---|---|
Browns Ferry  Alabama (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+30945.52 h1,289.397 days <br />184.2 weeks <br />42.389 months <br />) | |
| Opened: | Rodney Nacoste 16:31 Feb 6, 2013 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Feb 6, 2013 |
| 48724 - NRC Website
| |