ENS 46212

v t e ENS Event
23:05 Aug 29, 2010
Title	Unusual Event Declared Due to Loss of Annuciators in the Control Room
Event Description	At 1905 EST, Vermont Yankee declared a Notice of an Unusual Event (NOUE) based on EAL SU 4.1, loss of 75% of the control room annunciators associated with safety related systems for greater than 15 minutes. Around 1845 EST, several annunciators were received and based on the failure mode, the licensee conservatively estimated that greater than 75% of the annunciators in the control room were inoperable. The licensee will notify the NRC Resident Inspector. * * NOTIFIED BY BOB VITA TO BILL HUFFMAN AT 2037 EST ON 8/29/10 * * * The licensee determined that the cause of the annunciator loss was a blown fuse. The fuse was replaced and the annunciators were restored without further issues. Vermont Yankee exited the NOUE at 2028 EST. The licensee has notified State authorities and will notify NRC Resident Inspector. Notified R1DO (Henderson), NRR EO (Evans), IRD (Gott), DHS (Vestal), and FEMA (Visce).

ENS 46212 +/-
Where
Vermont Yankee Vermont (NRC Region 1)
Reporting
Emergency class:	Unusual Event
10 CFR 50.72(a) (1) (i), Emergency Class Declaration
Time - Person (Reporting Time:+-3.12 h-0.13 days <br />-0.0186 weeks <br />-0.00427 months <br />)
Opened:	Bob Vita 19:58 Aug 29, 2010
NRC Officer:	Dong Park
Last Updated:	Aug 29, 2010
46212 - NRC Website
v • d • e

v t e Emergency Notification System
Vermont Yankee with 10 CFR 50.72(a)(1)(i), Emergency Class Declaration
WEEKMONTHYEAR2010-08-29T23:05:00 [Table view]
[ENS list for Vermont Yankee]

Navigation menu