ENS 52358
ENS Event | |
|---|---|
16:15 Nov 9, 2016 | |
| Title | Insufficient Alarm Audibility |
| Event Description | On November 9, 2016, at approximately 1115 hours0.0129 days <br />0.31 hours <br />0.00184 weeks <br />4.242575e-4 months <br /> (EST), the speaker system in Buildings 302, 303, and 306 West was identified as non-operational while performing a functional test of the system. This speaker system is designed to annunciate alarms generated from the Criticality Accident Alarm System (CAAS) required by 10CFR70.24, alarms generated from the Fire Alarm Control Panel and Public Address System announcements. Additional functional testing identified that no redundant speakers could adequately provide speaker coverage for all affected areas of these buildings. Special Nuclear Material (SNM) is processed, handled, or stored within the areas where the speaker system failed; these areas require evacuation in the unlikely event of a nuclear criticality accident as described in the NFS Emergency Plan.
There were no actual radiological or other nuclear safety consequences. The potential consequence was that in the event of a nuclear criticality accident, evacuation could have been delayed for those personnel within these areas with a resultant increase of postulated doses. Additionally, awareness of a fire event could have been delayed for these same personnel. A series of compensatory actions were taken including implementing a plant-wide stop-movement of SNM, limiting access to the affected areas to essential personnel, and establishing radio communications between the personnel in these areas and the personnel continuously monitoring the alarm station panel. On November 9, 2016, at approximately 1725 hours0.02 days <br />0.479 hours <br />0.00285 weeks <br />6.563625e-4 months <br /> (EST), full compliance was restored by repairing a damaged cable and by successfully performing a speaker system test in the affected areas. The licensee notified the NRC Resident Inspector on November 9, 2016. NFS Event Number: 55579 |
| Where | |
|---|---|
| Nuclear Fuel Services Inc. Erwin, Tennessee (NRC Region 2) | |
| License number: | SNM-124 |
| Reporting | |
| 10 CFR 70.50(b)(2) | |
| Time - Person (Reporting Time:+1.45 h0.0604 days <br />0.00863 weeks <br />0.00199 months <br />) | |
| Opened: | Ron Rice 17:42 Nov 9, 2016 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Nov 9, 2016 |
| 52358 - NRC Website | |
Nuclear Fuel Services Inc. with 10 CFR 70.50(b)(2) | |
WEEKMONTHYEARENS 559022022-05-18T18:50:00018 May 2022 18:50:00
[Table view]10 CFR 70.50(b)(2) Criticality Accident Alarm System Speakers Disabled ENS 542182019-08-13T20:00:00013 August 2019 20:00:00 10 CFR 70.50(b)(2) Criticality Accident Alarm System Speaker Failure ENS 524042016-12-01T15:14:0001 December 2016 15:14:00 10 CFR 70.50(b)(2) Office Area Alarm Audibility Disabled ENS 523582016-11-09T16:15:0009 November 2016 16:15:00 10 CFR 70.50(b)(2) Insufficient Alarm Audibility ENS 521902016-08-17T21:39:00017 August 2016 21:39:00 10 CFR 70.50(b)(2) Failure of a Speaker in an Area Potentially Requiring Personnel Evacuation ENS 499982014-04-04T17:15:0004 April 2014 17:15:00 10 CFR 70.50(b)(2) Criticality Accident Evacuation Alarm Not Audible in Certain Areas Outside the Material Handling Area ENS 498482014-02-21T13:39:00021 February 2014 13:39:00 10 CFR 70.50(b)(2) Audibility of Alarm System ENS 460862010-07-12T16:00:00012 July 2010 16:00:00 10 CFR 70.50(b)(2) Electrical Fault Disabled Public Address System Which Supports Various Alarm Annunciators ENS 451792009-06-30T20:00:00030 June 2009 20:00:00 10 CFR 70.50(b)(2) Safety Equipment Failure of the Criticality Alarm System ENS 438832008-01-05T14:00:0005 January 2008 14:00:00 10 CFR 70.50(b)(2) Safety Equipment Failure of the Criticality Alarm System ENS 422262005-12-22T19:00:00022 December 2005 19:00:00 10 CFR 70.50(b)(2), 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation Safety Equipment Failure 2022-05-18T18:50:00 | |