ENS 51885
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ENS Event | |
|---|---|
02:13 Apr 27, 2016 | |
| Title | Alert and Notification System Feedback System Inoperable |
| Event Description | On April 26, 2016 at 2213 EDT, Watts Bar Nuclear Plant authorized notification of State agencies for the partial loss of the WBN Alert and Notification System (ANS) feedback system. The ANS feedback system provides monitoring capability of the off-site sirens surrounding the facility in the event of a plant Emergency. Without the feedback system in service, sirens may be activated remotely from State and local facilities but verification of successful activation is impaired. State agencies were notified to evaluate if other methods of alerting the public were warranted.
No compensatory methods are required for this failure, as the ANS activation feedback systems remain fully functional at the State and local facilities. The cause for the loss of the ANS feedback system is under investigation. This is being reported under 10 CFR 50.72(b)(2)(xi) and 10 CFR 50.72(b)(3)(xiii). The NRC Senior Resident has been notified.
The cause of the partial loss of WBN ANS Feedback System was determined to be an equipment failure. AT&T has completed the work and the modem has been reset. The Corporate TVA Operational Duty Specialist (ODS) has been monitoring [the system] and there have been no issues identified with the feedback system. Therefore, the issue has been repaired. In addition, further confirmation from the State of Tennessee and Rhea County was received that the sirens were fully functional at all times. The Feedback Monitoring System for the ANS was not available to the ODS only. Therefore, TVA Watts Bar is retracting the 10 CFR 50.72 (b)(3)(xiii) notification for Loss of Emergency Preparedness Capabilities. The licensee has notified the NRC Resident Inspector. Notified the R2DO (Ehrhardt). |
| Where | |
|---|---|
Watts Bar  Tennessee (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+-2.2 h-0.0917 days <br />-0.0131 weeks <br />-0.00301 months <br />) | |
| Opened: | John Tuite 00:01 Apr 27, 2016 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Apr 29, 2016 |
| 51885 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Hot Shutdown (0 %) |
| After | Hot Shutdown (0 %) |
Watts Bar with 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
WEEKMONTHYEARENS 568502023-11-12T08:00:00012 November 2023 08:00:00
[Table view]10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification ENS 557412022-02-16T16:59:00016 February 2022 16:59:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Offsite Communication Capability ENS 555902021-11-18T04:10:00018 November 2021 04:10:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Non-Work Related On-Site Fatality ENS 555502021-10-28T17:40:00028 October 2021 17:40:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Two Monitoring Wells Exceeding NEI GPI Tritium Threshold Values ENS 547532020-06-22T17:04:00022 June 2020 17:04:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Groundwater Initiative ENS 543792019-11-12T12:00:00012 November 2019 12:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Operations Facility Out of Service ENS 542772019-09-13T09:27:00013 September 2019 09:27:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness En Revision Imported Date 9/17/2019 ENS 524002016-11-29T12:32:00029 November 2016 12:32:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Chemical Spill Onsite ENS 521632016-08-09T18:15:0009 August 2016 18:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Oil Sheen in Cooling Tower Basin ENS 521262016-07-26T19:36:00026 July 2016 19:36:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Oil Sheen in Cooling Tower Basin ENS 520212016-06-18T15:06:00018 June 2016 15:06:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notifications to Uscg National Response Center and Tema ENS 518852016-04-27T02:13:00027 April 2016 02:13:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Alert and Notification System Feedback System Inoperable ENS 505802014-10-30T15:00:00030 October 2014 15:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification and Press Release Regarding Boone Dam Stability Issues ENS 499502014-03-24T16:55:00024 March 2014 16:55:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Death of Employee ENS 497362014-01-17T16:43:00017 January 2014 16:43:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Onsite Death of an Employee ENS 496502013-12-18T14:32:00018 December 2013 14:32:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Contract Employee Collapsing within the Protected Area ENS 489502013-04-21T06:11:00021 April 2013 06:11:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event Due to Shots Fired within the Owner Controlled Area ENS 480752012-07-06T14:12:0006 July 2012 14:12:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Loss of 7 Offsite Sirens Due to Inclement Weather ENS 473482011-10-18T00:50:00018 October 2011 00:50:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unit 1 Declared an Unusual Event Based on Ammonia Levels Exceeding Osha Limits ENS 470212011-07-04T17:36:0004 July 2011 17:36:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Spurious Siren Activation ENS 469672011-06-16T17:09:00016 June 2011 17:09:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Chemical Release from Intake Pumping Station. ENS 464692010-12-06T13:15:0006 December 2010 13:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Osha Contacted Due to Fatality of Contractor Employee ENS 464482010-12-02T21:10:0002 December 2010 21:10:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to an Individual Contamination ENS 430022006-11-21T11:15:00021 November 2006 11:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Unidentified Leakage ENS 414002005-02-10T22:01:00010 February 2005 22:01:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Tritium Sample Exceeding Offsite Dose Calculation Manual (Odcm) Reporting Level ENS 410492004-09-17T09:00:00017 September 2004 09:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Siren Capability and Notification of Offsite Agency 2023-11-12T08:00:00 | |
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