ENS 46650
ENS Event | |
|---|---|
20:00 Mar 1, 2011 | |
| Title | Failure to Maintain Mass Control of Uo2 Powder |
| Event Description | At approximately 3:00 pm [EST] on Tuesday, March 1st, it was reported that 15.3kg of UO2 powder was removed from the UO2 Sinter Test Grinding Station [High Efficiency Particulate Air] HEPA filter housing transition. This clean-out was performed as a response to routine radiological surveys that indicated the presence of uranium. It was determined that this material was present during prior filter replacement in early February in which 30.9 kg of UO2 powder was removed. The total amount of UO2 powder present in the housing was therefore approximately 46 kg, which is greater than a safe mass.
The Sinter Test Grinding Station and associated equipment was already shut down because of the HEPA filter housing clean-out and remained down pending investigation and implementation of corrective actions. Failure to maintain mass control resulted in a loss of double contingency for the filter housing. The double contingency controls required include (1) mass control and (2) moderation control. Moderation control, the 2nd leg of double contingency remained in place, was effective, and was not challenged. As a result, no unsafe condition existed. The UO2 in the HEPA housing was transferred into [a] favorable geometry [of] 3-gallon cans per procedure. An investigation is ongoing. At no time did an unsafe condition exist as the moderation control was in place, was effective, and was not challenged. Immediate corrective actions [are] complete [transfer of material into 3-gallons cans]. Investigation of [the] event and implementation of long term corrective actions [are] pending. The licensee will be notifying the NRC Region II, State, and Local Authorities. |
| Where | |
|---|---|
| Global Nuclear Fuel Wilmington, North Carolina (NRC Region 2) | |
| License number: | SNM-1097 |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+15.17 h0.632 days <br />0.0903 weeks <br />0.0208 months <br />) | |
| Opened: | Phillip Ollis 11:10 Mar 2, 2011 |
| NRC Officer: | John Shoemaker |
| Last Updated: | Mar 2, 2011 |
| 46650 - NRC Website
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Global Nuclear Fuel with Other Unspec Reqmnt | |
WEEKMONTHYEARENS 478292012-04-12T12:00:00012 April 2012 12:00:00
[Table view]Other Unspec Reqmnt Internal Reporting Requirement for Criticality Safety Controls ENS 473802011-10-26T19:00:00026 October 2011 19:00:00 Other Unspec Reqmnt Loss of Double Contingency ENS 472692011-09-14T19:30:00014 September 2011 19:30:00 Other Unspec Reqmnt, 10 CFR 70.74 APP. A 24 Hour Report Due to Double Contingency Not Maintained ENS 472652011-09-13T18:45:00013 September 2011 18:45:00 Other Unspec Reqmnt 24-Hour Report Involving Potential Failure to Maintain Double Contingency Criteria ENS 471612011-08-16T16:00:00016 August 2011 16:00:00 Other Unspec Reqmnt Improper Criticality Safety Evaluation ENS 466632011-03-08T05:00:0008 March 2011 05:00:00 Other Unspec Reqmnt Gnf Procedure 40-32 Loss of a Single Material Control Transaction ENS 466502011-03-01T20:00:0001 March 2011 20:00:00 Other Unspec Reqmnt Failure to Maintain Mass Control of Uo2 Powder ENS 459762010-06-04T13:30:0004 June 2010 13:30:00 Other Unspec Reqmnt Active Criticality Controls Not in Irofs 2012-04-12T12:00:00 | |