ENS 51333: Difference between revisions

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| event date = 08/20/2015 10:32 CDT
| event date = 08/20/2015 10:32 CDT
| last update date = 08/20/2015
| last update date = 08/20/2015
| title = Automatic Start Of An Emergency Diesel Generator On Low Bus Voltage
| title = Automatic Start of an Emergency Diesel Generator on Low Bus Voltage
| event text = On August 20, 2015, at approximately 1032 CDT, during the Residual Heat Removal flow rate test, the 3ED 4kV Shutdown Board received a degraded voltage signal, which automatically started the 3D Emergency Diesel Generator (EDG).  The EDG performed its safety function by automatically supplying power to the Shutdown Board.  Troubleshooting on the degraded voltage signal is in progress.  The remaining 4kV Shutdown Boards and EDGs were unaffected and remain operable.
| event text = On August 20, 2015, at approximately 1032 CDT, during the Residual Heat Removal flow rate test, the 3ED 4kV Shutdown Board received a degraded voltage signal, which automatically started the 3D Emergency Diesel Generator (EDG).  The EDG performed its safety function by automatically supplying power to the Shutdown Board.  Troubleshooting on the degraded voltage signal is in progress.  The remaining 4kV Shutdown Boards and EDGs were unaffected and remain operable.
This constitutes an automatic actuation of the EDG and requires an 8-hour ENS notification in accordance with 10 CFR 50.72(b)(3)(iv)(A), due to the valid actuation of the EDG, and a 60-day report in accordance with 10 CFR 50.73(a)(2)(iv)(A).
This constitutes an automatic actuation of the EDG and requires an 8-hour ENS notification in accordance with 10 CFR 50.72(b)(3)(iv)(A), due to the valid actuation of the EDG, and a 60-day report in accordance with 10 CFR 50.73(a)(2)(iv)(A).

Latest revision as of 20:46, 1 March 2018

ENS 51333 +/-
Where
Browns Ferry Tennessee Valley Authority icon.png
Alabama (NRC Region 2)
Reporting
10 CFR 50.72(b)(3)(iv)(A), System Actuation
LER: 05000296/LER-2015-005
Regarding Automatic Actuation of 30 Diesel Generator Due to 4kV Shutdown Board Trip During Testing
Time - Person (Reporting Time:+3.32 h0.138 days <br />0.0198 weeks <br />0.00455 months <br />)
Opened: Joe Bennett
18:51 Aug 20, 2015
NRC Officer: Mark Abramovitz
Last Updated: Aug 20, 2015
51333 - NRC Website
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