ENS 52315
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ENS Event | |
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00:08 Oct 24, 2016 | |
Title | Control Room Emergency Ventilation Fan Inoperable Due to Elevated Vibration |
Event Description | At 1908 CDT on 10/23/16, elevated vibration readings were identified on Cooper Nuclear Station [CNS], Control Room Emergency Filter System (CREFS) supply fan A. Vibration readings were evaluated by Engineering and were determined to be indicative of bearing failure on supply fan A. The Control Room declared CREFS inoperable and entered LCO 3.7.4, Condition A, which requires restoration of CREFS to operable status in 7 days. Repair activities have been initiated for this condition.
The plant is currently in Mode 5, with refueling activities and OPDRVs [Operation with Potential to Drain Reactor Vessel] in progress. CNS is not currently in the mode of applicability for a USAR defined accident. This condition is being conservatively reported under 10 CFR 50.72(b)(3)(v)(D) as a single train safety system that is required to be OPERABLE during situations under which significant radioactive releases can be postulated. The NRC Resident Inspector has been notified. |
Where | |
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Cooper Nebraska (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
LER: | 05000298/LER-2016-006 |
Time - Person (Reporting Time:+-0.45 h-0.0188 days <br />-0.00268 weeks <br />-6.1641e-4 months <br />) | |
Opened: | Curtis Martin 23:41 Oct 23, 2016 |
NRC Officer: | John Shoemaker |
Last Updated: | Oct 23, 2016 |
52315 - NRC Website
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