ENS 51011

v t e ENS Event
15:20 Apr 4, 2015
Title	Power Lost to Control Room Normal Outside Air Intake Dampers During Testing
Event Description	On April 4, 2015, during testing of the Control Room ventilation system while in Mode 5 at 0% power during shutdown for a refueling outage, the 1CZ-1 and 1CZ-2 Control Room Normal Outside Air Intake dampers lost power due to circuit breaker trips, preventing closure. Harris personnel immediately closed the dampers as required by Harris Nuclear Plant Technical Specifications. During subsequent evaluation, this event was determined to be reportable on April 24, 2015, at approximately 1200 EDT. This event is being reported under the non-emergency notification requirement of 10 CFR 50.72 (b)(3)(v)(A), 'Any event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to shut down the reactor and maintain it in a safe shutdown condition,' and 50.72(b)(3)(v)(D), 'Any event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident.' There was no adverse impact to public health and safety or to plant employees. The NRC Resident Inspector has been notified.

ENS 51011 +/-
Where
Harris North Carolina (NRC Region 2)
Reporting

10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+480.88 h20.037 days <br />2.862 weeks <br />0.659 months <br />)
Opened:	Tim English 16:13 Apr 24, 2015
NRC Officer:	Dong Park
Last Updated:	Apr 24, 2015
51011 - NRC Website
v • d • e

v t e Emergency Notification System
Harris with 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
WEEKMONTHYEAR2022-10-28T00:50:00 [Table view]
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