ENS 43834

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v t e ENS Event
20:02 Oct 15, 2007
Title	Inadvertent Start of Emergency Diesel Generator D2
Event Description	This notification is being made to report an invalid system actuation in accordance with 10 CFR 50.73(a)(2)(iv)(A). Prairie Island Nuclear Generating Plant (PINGP) Train B Unit 1 emergency diesel generator (D2) started due to an invalid system actuation. On 10/15/07, at approximately 1402 hours0.0162 days <br />0.389 hours <br />0.00232 weeks <br />5.33461e-4 months <br /> (CDT), with PINGP Unit 1 in MODE 1, D2 started inadvertently during an air roll. The inadvertent start of D2 Diesel Generator occurred while the diesel was declared inoperable (Technical Specification LCO 3.8.1 CONDITION B was entered at 0916 10/15/07 and exited at 1433 10/15/07). Normally, an air roll uses starting air to turn the engine one revolution to clear oil from the top piston of the D2 opposed piston diesel engine. The D2 control switch is to be in pullout per procedure. However, due to operator error, the D2 control switch was not in pullout during the air roll and D2 started during the attempted air roll. D2 did not automatically connect to the associated emergency bus (Bus 16), because no bus undervoltage signal was present and the supply breaker was open. The Train A diesel generator (D1) remained operable during this event and the Train A EDG was able to provide power to the Train A emergency bus (Bus 15), if necessary. The invalid start was entered into the PINGP corrective action program. The preliminary investigation of this event determined that the D2 start was caused by operator error - the outplant operators performing the air roll missed a step in the procedure that directed calling the control room to verify the D2 control switch in pullout prior to conducting the air roll. Corrective actions for this event are in progress and are being tracked via the corrective action program. The licensee will notify the NRC Resident Inspector.

ENS 43834 +/-
Where
Prairie Island Minnesota (NRC Region 3)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+1360.92 h56.705 days <br />8.101 weeks <br />1.864 months <br />)
Opened:	Gene Dammann 13:57 Dec 11, 2007
NRC Officer:	Mark Abramovitz
Last Updated:	Dec 11, 2007
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v • d • e

v t e Emergency Notification System
Prairie Island with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2017-10-26T01:50:00 [Table view]
[ENS list for Prairie Island]

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