ENS 55902
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ENS Event | |
|---|---|
18:50 May 18, 2022 | |
| Title | Criticality Accident Alarm System Speakers Disabled |
| Event Description | The following information was provided by the licensee via email:
On May 18, 2022, at approximately 1450 (EDT), an electrical switch for the Criticality Accident Alarm System (CAAS) legacy speakers was noted to be out of its normal position. A functional redundant speaker system is installed in the main processing plant and laboratory. As a consequence of the switch being out of position, in the highly unlikely event that the CAAS had actuated, the alarm would not have been annunciated in areas outside of the main processing area and laboratory where there are no redundant speakers. Compliance was restored at approximately 1500 (EDT) when the switch was placed back in its normal position. The system was subsequently tested and confirmed to be operational. The most recent audibility test of the speaker system had been performed on May 13, 2022, at approximately 1100 (EDT). The licensee notified the NRC Resident Inspector on May 18, 2022, at approximately 1625 (EDT). There were no actual nuclear safety consequences. The potential consequence was that, in the event of a nuclear criticality accident, evacuation could have been delayed for those personnel outside of the main processing area where redundant speakers have not been installed. |
| 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:+16.92 h0.705 days <br />0.101 weeks <br />0.0232 months <br />) | |
| Opened: | Daniele Rogers 11:45 May 19, 2022 |
| NRC Officer: | Ossy Font |
| Last Updated: | May 19, 2022 |
| 55902 - 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 | |
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