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| Entered date | Event description | |
|---|---|---|
| ENS 53594 | 11 September 2018 17:14:00 | On September 11, 2018 the Technical Support Center (TSC) ventilation was discovered to be non-functional during system testing. At 1310 EDT, an air leak was identified that prevented the modulating dampers to operate as designed to maintain required pressure. The air leak was not able to be repaired within a 60 minute period. This failure affected the ability of the TSC ventilation system to maintain adequate radiological habitability in the event of an emergency with an airborne radiological release. All other capabilities of the TSC are unaffected by this emergent condition. The air leak has been repaired and post maintenance testing was completed satisfactory at 1654 (EDT), restoring the TSC ventilation to a functional condition. This notification is being made in accordance with 10 CFR 50.72(b)(3)(xiii) due to the potential loss of an emergency response facility because of the unavailability of the ventilation system. The NRC Resident Inspector has been notified. |
| ENS 47286 | 21 September 2011 22:48:00 | On 9/21/11 at 10:20 a.m. during the performance of a simulated loss of offsite power testing off the E33 4KV emergency bus, an unplanned start of the E3 Emergency Diesel Generator (EDG) occurred due to a valid bus under voltage signal caused by a relay malfunction. The bus being tested was inoperable in support of the test and was not carrying any required safety system loads at the time of the event. The EDG was secured and troubleshooting initiated. The initial determination was the EDG actuation was from an invalid signal but following further review it was determined that the relay malfunction had caused an untimely bus transfer that resulted in a valid 4KV bus under voltage condition. The NRC Resident Inspector has been notified. |