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While performing semi-annual criticality a … While performing semi-annual criticality accident alarm system (CAAS) testing, one unit in a pair of detectors failed to initiate the site wide alarm. Spare unit was immediately installed and all systems successfully tested. Production facility covered by this CAAS (was) in a shutdown status at the time of testing. Subsequent troubleshooting indicated a faulty electronic relay contact in the failed unit.</br>Testing of CAAS is conducted on a semi-annual basis in accordance with procedure, NFS-HS-A-80, Sections 5.5 & 5.6. (The) Detector pair on 2nd floor of Oxide Conversion Facility did not activate site-wide alarm as expected. Alarm indication did occur as expected at the local read-out panel, and at the central alarm panel located in an adjacent building occupied by security guards. Investigation revealed failed relay contact in Eberline Instruments Model RMS-3 read-out meter. (The) Unit (was) replaced, and (a) subsequent test (was) satisfactory.</br>No actual safety consequences occurred as a result of this event; however, there was a risk of potential health and safety consequence to the occupational workforce, involving significant radiation exposure from accidental criticality event with no warning to initiate prompt site-wide evacuation.</br>The licensee notified the NRC Resident Inspector.</br>* * * UPDATE FROM MICHAEL TESTER TO HUFFMAN AT 1626 EST ON 2/06/06 * * *</br>Following evaluation of this event by the licensee's Part 21 review committee, Nuclear Fuel Services has reached the conclusion that this event was the result of a design defect in the relay used in the RMS-3 read-out meter. This event is being updated to reflect the Part 21 reportability conclusion. The Eberline RMS-3 read-out meter is manufactured by Thermo Electron Corporation. Nuclear Fuel Services has been in contact with Eberline during its investigation and Eberline is aware of the conclusions. The defective relay is manufactured by Potter and Brumsfield. </br>Immediate corrective actions included replacement of the defective equipment, and re-testing to ensure operability; long term corrective action includes design and installation of PLC based surveillance equipment to continuously monitor the function of system components by NFS Engineering Department in approximately 3 - 6 months.</br>The licensee notified the NRC Resident Inspector. The R2DO (Bernhard), NMSS EO ( Janosko) and Part 21 coordinator (Markley) have been notified.</br>* * *UPDATE BY HUFFMAN ON 2/7/06 * * *</br>This event has been decontrolled to make it publicly available and permit information about this problem to be shared with all affected parties. NRC management has determined that the report does not contain information about sensitive operations at the NFS site.</br>R2DO(Bernhard) and NMSS (Morell) notified.te.
R2DO(Bernhard) and NMSS (Morell) notified.
19:00:00, 22 December 2005 +
42,226 +
13:30:00, 23 December 2005 +
19:00:00, 22 December 2005 +
While performing semi-annual criticality a … While performing semi-annual criticality accident alarm system (CAAS) testing, one unit in a pair of detectors failed to initiate the site wide alarm. Spare unit was immediately installed and all systems successfully tested. Production facility covered by this CAAS (was) in a shutdown status at the time of testing. Subsequent troubleshooting indicated a faulty electronic relay contact in the failed unit.</br>Testing of CAAS is conducted on a semi-annual basis in accordance with procedure, NFS-HS-A-80, Sections 5.5 & 5.6. (The) Detector pair on 2nd floor of Oxide Conversion Facility did not activate site-wide alarm as expected. Alarm indication did occur as expected at the local read-out panel, and at the central alarm panel located in an adjacent building occupied by security guards. Investigation revealed failed relay contact in Eberline Instruments Model RMS-3 read-out meter. (The) Unit (was) replaced, and (a) subsequent test (was) satisfactory.</br>No actual safety consequences occurred as a result of this event; however, there was a risk of potential health and safety consequence to the occupational workforce, involving significant radiation exposure from accidental criticality event with no warning to initiate prompt site-wide evacuation.</br>The licensee notified the NRC Resident Inspector.</br>* * * UPDATE FROM MICHAEL TESTER TO HUFFMAN AT 1626 EST ON 2/06/06 * * *</br>Following evaluation of this event by the licensee's Part 21 review committee, Nuclear Fuel Services has reached the conclusion that this event was the result of a design defect in the relay used in the RMS-3 read-out meter. This event is being updated to reflect the Part 21 reportability conclusion. The Eberline RMS-3 read-out meter is manufactured by Thermo Electron Corporation. Nuclear Fuel Services has been in contact with Eberline during its investigation and Eberline is aware of the conclusions. The defective relay is manufactured by Potter and Brumsfield. </br>Immediate corrective actions included replacement of the defective equipment, and re-testing to ensure operability; long term corrective action includes design and installation of PLC based surveillance equipment to continuously monitor the function of system components by NFS Engineering Department in approximately 3 - 6 months.</br>The licensee notified the NRC Resident Inspector. The R2DO (Bernhard), NMSS EO ( Janosko) and Part 21 coordinator (Markley) have been notified.</br>* * *UPDATE BY HUFFMAN ON 2/7/06 * * *</br>This event has been decontrolled to make it publicly available and permit information about this problem to be shared with all affected parties. NRC management has determined that the report does not contain information about sensitive operations at the NFS site.</br>R2DO(Bernhard) and NMSS (Morell) notified.te.
R2DO(Bernhard) and NMSS (Morell) notified.
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00:00:00, 7 February 2006 +
SNM-124 +
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23:36:07, 24 November 2018 +
13:30:00, 23 December 2005 +
0.771 d (18.5 hours, 0.11 weeks, 0.0253 months) +
19:00:00, 22 December 2005 +
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