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.
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). |
| Where | |
|---|---|
| Vermont Yankee File:NorthStar Vermont Yankee icon.png 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
Loading map... | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Vermont YankeeFile:NorthStar Vermont Yankee icon.png with 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | |
WEEKMONTHYEARENS 462122010-08-29T23:05:00029 August 2010 23:05:00
[Table view]10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Loss of Annuciators in the Control Room ENS 460382010-06-23T18:25:00023 June 2010 18:25:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to an Earthquake Felt Onsite ENS 426052006-05-25T01:02:00025 May 2006 01:02:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event for a Fire Lasting Greater than Ten Minutes ENS 408272004-06-18T10:50:00018 June 2004 10:50:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to a Main Transformer Fire Lasting Fire Longer than 10 Minutes. 2010-08-29T23:05:00 | |
