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At approximately 1:00 p.m. on April 1, 200 … 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.</br>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.</br>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.</br>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.</br>POTENTIAL CRITICALITY PATHWAYS INVOLVED: There is no known process upset that would change the highly unlikely potential for a criticality in this area. </br>CONTROLLED PARAMETERS (MASS, MODERATION, GEOMETRY, CONCENTRATION ETC.): Density and Mass (concentration)</br>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)</br>NUCLEAR CRITICALITY SAFETY CONTROL(S) OR CONTROL SYSTEMS AND DESCRIPTION OF THE FAILURES OR DEFICIENCIES: N/A</br>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.</br>The licensee will notified the local County, the State of North Carolina, and NRC Region II.tate of North Carolina, and NRC Region II.
18:00:00, 1 April 2004 +
40,633 +
10:35:00, 2 April 2004 +
18:00:00, 1 April 2004 +
At approximately 1:00 p.m. on April 1, 200 … 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.</br>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.</br>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.</br>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.</br>POTENTIAL CRITICALITY PATHWAYS INVOLVED: There is no known process upset that would change the highly unlikely potential for a criticality in this area. </br>CONTROLLED PARAMETERS (MASS, MODERATION, GEOMETRY, CONCENTRATION ETC.): Density and Mass (concentration)</br>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)</br>NUCLEAR CRITICALITY SAFETY CONTROL(S) OR CONTROL SYSTEMS AND DESCRIPTION OF THE FAILURES OR DEFICIENCIES: N/A</br>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.</br>The licensee will notified the local County, the State of North Carolina, and NRC Region II.tate of North Carolina, and NRC Region II.
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00:00:00, 2 April 2004 +
SNM-1097 +
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23:41:41, 24 November 2018 +
10:35:00, 2 April 2004 +
0.691 d (16.58 hours, 0.0987 weeks, 0.0227 months) +
18:00:00, 1 April 2004 +
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