ENS 41879
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ENS Event | |
|---|---|
14:18 Jul 25, 2005 | |
| Title | Unplanned Contamination Event Due to Filter Failure |
| Event Description | An unplanned contamination event occurred on 25 July 2005. This is a reportable event in accordance with 10 CFR 40.60 sub paragraph (1) based on additional radiological controls being required for more than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. The additional control imposed was the requirement to wear air purifying respirators in the Feed Materials Building. The location of the event was the Feed Materials Building. The Feed Materials Building is where milled uranium oxide material is converted to uranium hexafluoride. Located on the sixth floor, the Ash Vacuum Cleaner filters failed which allowed spar and dust filter fines containing uranium to exit the discharge from the Ash Vacuum Cleaner. Due to the proximity of the Ash Vacuum Cleaner discharge and the inlet to the building ventilation, some the material was picked up by the ventilation system and distributed throughout the Feed Materials Building. A dust plume was noted coming from the discharge line of the Ash Vacuum Cleaner at approximately 0918. At approximately the same time, personnel in the building noted dust being emitted from the building ventilation system registers. The Ash Vacuum Cleaner was secured at approximately 0920. Personnel recognized the potential for airborne radioactivity and immediately required respiratory protection for all personnel in the building. Special bioassay samples were required for 19 people who were present in the building during the occurrence. The results of the special bioassays indicated no uptake of radioactivity by the personnel sampled. Fixed air samplers analyzed after the event on all floor indicated air activity in the range of 5x10 E-11microcuries/ml to 60x10 E-11microcuries/ml. Air samples and contamination surveys performed downwind were background levels. Cleanup of the granular material in the Feed Material Building commenced immediately.
The isotope release was U-238, the chemical form is UF4, and the physical form is granular. The Feed Materials Building has now been cleaned of contamination that was due to this event. The licensee has notified NRC Region 2 (Hartland), NRC HQ (Raddatz) and NRC Regional Inspector (Gibson). |
| Where | |
|---|---|
| Honeywell International, Inc. Metropolis, Illinois (NRC Region 2) | |
| License number: | SUB-526 |
| Reporting | |
| 10 CFR 40.60(b)(1) | |
| Time - Person (Reporting Time:+73.7 h3.071 days <br />0.439 weeks <br />0.101 months <br />) | |
| Opened: | Darren Mays 16:00 Jul 28, 2005 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Jul 28, 2005 |
| 41879 - NRC Website | |
Honeywell International, Inc. with 10 CFR 40.60(b)(1) | |
WEEKMONTHYEARENS 451952009-07-11T01:00:00011 July 2009 01:00:00
[Table view]10 CFR 40.60(b)(1) Unplanned Contamination Event Requiring Additional Radiological Controls (Respirators) for More than 24 Hours ENS 451632009-06-24T15:45:00024 June 2009 15:45:00 10 CFR 40.60(b)(1) Access Restriction Due to Unplanned Contamination ENS 450582009-05-11T16:30:00011 May 2009 16:30:00 10 CFR 40.60(b)(1) Multiple Failures to Meet 24 Hour Reporting Criteria ENS 449392009-03-24T18:30:00024 March 2009 18:30:00 10 CFR 40.60(b)(1) Building Contaminated During Maintenance ENS 448712009-02-23T16:30:00023 February 2009 16:30:00 10 CFR 40.60(b)(1) Airborne Contamination Over the Limit in the Feed Materials Building ENS 448572009-02-16T16:30:00016 February 2009 16:30:00 10 CFR 40.60(b)(1) 24-Hour Report Involving an Unplanned Contamination Event ENS 444442008-08-27T15:00:00027 August 2008 15:00:00 10 CFR 40.60(b)(1) Unplanned Contamination Event ENS 419772005-09-09T15:00:0009 September 2005 15:00:00 10 CFR 40.60(b)(1) Unplanned Contamination Event ENS 418792005-07-25T14:18:00025 July 2005 14:18:00 10 CFR 40.60(b)(1) Unplanned Contamination Event Due to Filter Failure 2009-07-11T01:00:00 | |
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