ENS 41651

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v t e ENS Event
21:30 Apr 28, 2005
Title	* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Event Description	THIS IS NOT A NEW REPORT. This event report was originally withheld from public release under the NRC's policy for protecting sensitive unclassified information. The NRC has reevaluated this policy and is now making this event report available to the public with suitable redactions. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * INADEQUATELY CONTROLLED OR ANALYZED PATHWAY FOR MATERIAL ACCUMULATION This event occurred at Building [DELETED] in the Uranium-Aluminum Hydrogen dilution system area. The licensee observed a solution accumulated in a HEPA filter housing on the Building [DELETED] roof. Analysis of the solution determined the liquid to be a caustic byproduct of the process. Further analysis indicated that approximately 3 grams of U-235 were in the HEPA housing and filter. Further reviews of the system design identified potential pathways from the Uranium-Aluminum dissolution system that did not appear to be adequately controlled or analyzed. The nuclear criticality safety of the system relied on the physical design to prevent uranium [DELETED] materials from entering the hydrogen dilution system and the filter housing. The system also relied on a drain in the dilution system ductwork to prevent material from entering the filter housing. The licensee considers the Nuclear Criticality Safety significance low given the very low likelihood of accumulating a sufficient mass or concentration of uranium [DELETED] material into the HEPA filter housing The process was not in operation when the solution in the filter housing was found. The operation will remain shut down until additional reviews and/or design modifications are completed. The licensee will notify the NRC Resident Inspector, the Region 2 Inspector (Ayres), and HQ contact (Berg). * * UPDATE ON 05/11/08 BY J. KOZAL * * * THIS IS NOT A NEW REPORT. This event report was originally withheld from public release under the NRC's policy for protecting sensitive unclassified information. The NRC has reevaluated this policy and is now making this event report available to the public with suitable redactions.

ENS 41651 +/-
Where
Nuclear Fuel Services Inc. Erwin, Tennessee (NRC Region 2)
License number:	SNM-124
Reporting

Part 70 App A (B)(1)
Time - Person (Reporting Time:+13.12 h0.547 days <br />0.0781 weeks <br />0.018 months <br />)
Opened:	Randy Shackelford 10:37 Apr 29, 2005
NRC Officer:	Bill Huffman
Last Updated:	May 11, 2008
41651 - NRC Website
v • d • e

v t e Emergency Notification System
Nuclear Fuel Services Inc. with Part 70 App A (B)(1)
WEEKMONTHYEAR2014-10-29T07:00:00 [Table view]
[ENS list for Nuclear Fuel Services Inc.]

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