ENS 40633
ENS Event | |
|---|---|
18:00 Apr 1, 2004 | |
| Title | Outdoor Area Criticality Warning System Horn Inoperative |
| Event Description | At approximately 1:00 p.m. on April 1, 2004 it was discovered a Criticality Warning System (CWS) horn had been rendered inoperative in an unoccupied remote outdoor area due to maintenance conducted on the system on March 31, 2004. Maintenance was conducted on the system to remove a tree that had fallen across the communication line to Data Acquisition Module (DAM) #25 which provides coverage for the outdoor process lagoon area. During maintenance activities to remove the tree, a temporary system was installed and the permanently installed system horn was disconnected. Following completion of the maintenance, the restoration effort failed to reinstall a local horn relay.
Throughout the maintenance, the DAM remained operable and indications of normal conditions were available. With the exception of the local horn at the remote outdoor area, all other system functions remained operable. Upon discovery of the local horn being disabled, the horn relay was promptly restored and tested, confirming restoration of full system operability. This condition is reported pursuant to 10CFR70.50(B)(2) as an event in which equipment designed to mitigate the effects of an incident are disabled or fails to function as designed. Incident investigation and evaluation of additional corrective actions are continuing. SAFETY SIGNIFICANCE OF EVENTS: Low safety significance - The potential for a criticality event in this area is highly unlikely because of the very low uranium concentration, low material density, and high levels of non-uranium materials. This is consistent with the Integrated Safety Analysis (ISA) for the area. POTENTIAL CRITICALITY PATHWAYS INVOLVED: There is no known process upset that would change the highly unlikely potential for a criticality in this area. CONTROLLED PARAMETERS (MASS, MODERATION, GEOMETRY, CONCENTRATION ETC.): Density and Mass (concentration) ESTIMATED AMOUNT, ENRICHMENT, FORM OF LICENSED MATERIAL (INCLUDE PROCESS LIMIT AND % WORST BASE CRITICAL MASS): N/A. Affected area is final wastewater process lagoon. Uranium concentration in the affected area is approximately [deleted] parts per million (PPM) NUCLEAR CRITICALITY SAFETY CONTROL(S) OR CONTROL SYSTEMS AND DESCRIPTION OF THE FAILURES OR DEFICIENCIES: N/A CORRECTIVE ACTIONS TO RESTORE SAFETY SYSTEMS AND WHEN EACH WAS IMPLEMENTED: System was restored to normal operation at 1300 on 4/1/04 and subsequently tested. Investigation of event and evaluation of additional corrective actions pending. The licensee will notified the local County, the State of North Carolina, and NRC Region II. |
| Where | |
|---|---|
| Global Nuclear Fuel - Americas Wilmington, North Carolina (NRC Region 2) | |
| License number: | SNM-1097 |
| Reporting | |
| 10 CFR 70.50(b)(2) | |
| Time - Person (Reporting Time:+16.58 h0.691 days <br />0.0987 weeks <br />0.0227 months <br />) | |
| Opened: | Allen Mabry 10:35 Apr 2, 2004 |
| NRC Officer: | Mike Ripley |
| Last Updated: | Apr 2, 2004 |
| 40633 - NRC Website
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Global Nuclear Fuel with 10 CFR 70.50(b)(2) | |
WEEKMONTHYEARENS 497592014-01-22T18:15:00022 January 2014 18:15:00
[Table view]10 CFR 70.50(b)(2) Inoperable Criticality Warning System Local Alarm in Wilmington Field Services Center Building Number 1 ENS 481002012-07-11T21:40:00011 July 2012 21:40:00 10 CFR 70.50(b)(2) Criticality Horns Rendered Inoperable Due to Lightning Strike ENS 478512012-04-18T17:45:00018 April 2012 17:45:00 10 CFR 70.50(b)(2) Local Alarm Horn Was Found to Be Inaudible During Routine Testing ENS 477242012-03-07T18:15:0007 March 2012 18:15:00 10 CFR 70.50(b)(2) Local Alarm Horn Was Found to Be Inaudible During Routine Testing ENS 472202011-08-29T17:00:00029 August 2011 17:00:00 10 CFR 70.50(b)(2) Criticality Accident Alarm System Horn Discovered Inoperable ENS 470612011-07-14T20:55:00014 July 2011 20:55:00 10 CFR 70.50(b)(2) Inoperable Criticality Accident Alarm System Warning Horns ENS 470472011-07-12T21:30:00012 July 2011 21:30:00 10 CFR 70.50(b)(2) Inaudible Criticality Warning Siren ENS 470662011-05-01T16:00:0001 May 2011 16:00:00 10 CFR 70.50(b)(2) Previous Inoperability of Criticality Accident Alarm System Warning Circuit Not Identified ENS 447242008-12-16T11:00:00016 December 2008 11:00:00 10 CFR 70.50(b)(2) Criticality Warning System Disabled ENS 432672007-03-30T11:40:00030 March 2007 11:40:00 10 CFR 70.50(b)(2) Criticality Warning System Alarm Actuation Due to Power Fluctuation ENS 429792006-11-09T10:00:0009 November 2006 10:00:00 10 CFR 70.50(b)(2) Failure of Warning Horns ENS 427472006-08-01T09:00:0001 August 2006 09:00:00 10 CFR 70.50(b)(2) Audible Horn System Malfunction ENS 406332004-04-01T18:00:0001 April 2004 18:00:00 10 CFR 70.50(b)(2) Outdoor Area Criticality Warning System Horn Inoperative 2014-01-22T18:15:00 | |