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An unplanned contamination event occurred … An unplanned contamination event occurred on 10 July 2009. This is a reportable event in accordance with 10CFR40.60 sub paragraph (1) based on an unplanned event that resulted in additional radiological controls being required for more than 24 hours. The 24 hour period ended at 2000 CDT on 11 July 2009 (the reported event). The additional control imposed was the wearing of air purifying respirators on the fourth floor of the Feed Materials Building. The location of the event was the Feed Materials Building fourth floor. The Feed Materials Building converts milled uranium oxide material to uranium hexafluoride by using a dry process. Air samples from the fourth floor were analyzed and the airborne radioactivity averaged approximately 6.11E-11 microcuries/ml. The airborne contaminant was natural uranium ore concentrate and the physical form is a light microscopic dust. The processes in the area of elevated levels of airborne radioactivity have been secured and potential leakage paths are being investigated.</br>The licensee will notify NRC Region II.</br>HOO Note: See similar Event Numbers 44857, 44871, 45058, and 45163.</br>* * * UPDATE FROM MICHAEL GREENO TO HOWIE CROUCH @ 1628 EDT ON 7/14/09 * * *</br>The isotope responsible for the increased controls was natural uranium in the chemical form of uranium tetraflouride (UF4); green salt. The amount of unplanned contamination that was released in the form of green salt was estimated to exceed 5 times the ALI (Annual Limit on Intake) (3 grams). The airborne activity averaged approximately 6.11E-11 microCuries/ml. (5.0E-11 microCuries/ml is 30% of 1 DAC (Derived Air Concentration)). </br>The licensee states that bioassay sampling of any potentially exposed individuals will be performed within the routine sampling frequency, but prior to 7/30/09.</br>The licensee has notified NRC Region II. Notified R2DO (O'Donohue) and NMSS EO (Kotzalas).d R2DO (O'Donohue) and NMSS EO (Kotzalas). +
01:00:00, 11 July 2009 +
45,195 +
00:08:00, 12 July 2009 +
01:00:00, 11 July 2009 +
An unplanned contamination event occurred … An unplanned contamination event occurred on 10 July 2009. This is a reportable event in accordance with 10CFR40.60 sub paragraph (1) based on an unplanned event that resulted in additional radiological controls being required for more than 24 hours. The 24 hour period ended at 2000 CDT on 11 July 2009 (the reported event). The additional control imposed was the wearing of air purifying respirators on the fourth floor of the Feed Materials Building. The location of the event was the Feed Materials Building fourth floor. The Feed Materials Building converts milled uranium oxide material to uranium hexafluoride by using a dry process. Air samples from the fourth floor were analyzed and the airborne radioactivity averaged approximately 6.11E-11 microcuries/ml. The airborne contaminant was natural uranium ore concentrate and the physical form is a light microscopic dust. The processes in the area of elevated levels of airborne radioactivity have been secured and potential leakage paths are being investigated.</br>The licensee will notify NRC Region II.</br>HOO Note: See similar Event Numbers 44857, 44871, 45058, and 45163.</br>* * * UPDATE FROM MICHAEL GREENO TO HOWIE CROUCH @ 1628 EDT ON 7/14/09 * * *</br>The isotope responsible for the increased controls was natural uranium in the chemical form of uranium tetraflouride (UF4); green salt. The amount of unplanned contamination that was released in the form of green salt was estimated to exceed 5 times the ALI (Annual Limit on Intake) (3 grams). The airborne activity averaged approximately 6.11E-11 microCuries/ml. (5.0E-11 microCuries/ml is 30% of 1 DAC (Derived Air Concentration)). </br>The licensee states that bioassay sampling of any potentially exposed individuals will be performed within the routine sampling frequency, but prior to 7/30/09.</br>The licensee has notified NRC Region II. Notified R2DO (O'Donohue) and NMSS EO (Kotzalas).d R2DO (O'Donohue) and NMSS EO (Kotzalas). +
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00:00:00, 14 July 2009 +
SUB-526 +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
23:26:00, 24 November 2018 +
00:08:00, 12 July 2009 +
0.964 d (23.13 hours, 0.138 weeks, 0.0317 months) +
01:00:00, 11 July 2009 +
Unplanned Contamination Event Requiring Additional Radiological Controls (Respirators) for More than 24 Hours +
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