ENS 46805: Difference between revisions
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| event date = 05/02/2011 06:26 CDT | | event date = 05/02/2011 06:26 CDT | ||
| last update date = 05/02/2011 | | last update date = 05/02/2011 | ||
| title = Specified System Actuation Due | | title = Specified System Actuation Due to a Emergency Diesel Generator Output Breaker Trip | ||
| event text = At 0626 [CDT] on 05/2/2011, with BFN U1 in Mode 4, Browns Ferry Nuclear Plant, received an 'A' Emergency Diesel Generator output breaker trip for unknown reasons that de-energized the 'A' 4kV Shutdown Board, resulting in a loss of power to RPS 'A' and a subsequent half scram, 'B' CREV and 'B/C' SGT automatic initiation, and Primary Containment isolation for Groups 2, 3, 6 and 8. The PCIS isolation (Group 2) also caused a loss of Shutdown Cooling on U1 which was restored at 0723 following restoration of power to the 'A' 4kV Shutdown Board from offsite 161kV power. | | event text = At 0626 [CDT] on 05/2/2011, with BFN U1 in Mode 4, Browns Ferry Nuclear Plant, received an 'A' Emergency Diesel Generator output breaker trip for unknown reasons that de-energized the 'A' 4kV Shutdown Board, resulting in a loss of power to RPS 'A' and a subsequent half scram, 'B' CREV and 'B/C' SGT automatic initiation, and Primary Containment isolation for Groups 2, 3, 6 and 8. The PCIS isolation (Group 2) also caused a loss of Shutdown Cooling on U1 which was restored at 0723 following restoration of power to the 'A' 4kV Shutdown Board from offsite 161kV power. | ||
The general containment isolation signals affecting containment isolation valves in more than one system is reportable as an 8 hour notification to the NRC IAW 10CFR50.72(b)(3)(iv), as any event or condition that results in a valid actuation of any of the systems listed in paragraph (b)(3)(iv)(B), except when the actuation results from and is part of a pre-planned sequence during testing or reactor operation. | The general containment isolation signals affecting containment isolation valves in more than one system is reportable as an 8 hour notification to the NRC IAW 10CFR50.72(b)(3)(iv), as any event or condition that results in a valid actuation of any of the systems listed in paragraph (b)(3)(iv)(B), except when the actuation results from and is part of a pre-planned sequence during testing or reactor operation. |
Latest revision as of 22:07, 1 March 2018
Where | |
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Browns Ferry ![]() Alabama (NRC Region 2) | |
Reporting | |
10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
Time - Person (Reporting Time:+0.03 h0.00125 days <br />1.785714e-4 weeks <br />4.1094e-5 months <br />) | |
Opened: | David Renn 11:28 May 2, 2011 |
NRC Officer: | Vince Klco |
Last Updated: | May 2, 2011 |
46805 - NRC Website
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