ENS 41097

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v t e ENS Event
13:10 Oct 6, 2004
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. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * SAFETY RELATED NEEDLE VALVES IN INCORRECT POSITION POTENTIAL HEALTH AND SAFETY CONSEQUENCES: Potential vulnerability to workers and public of a high consequence event involving failure of safety controls that were designed to prevent a hydrogen explosion in the BLEU Preparation Facility U-Aluminum Dissolution gloveboxes/dissolvers. SEQUENCE LEADING TO EVENT: Rotometers FIC-1F14A, 1C01, and 1D01 needle valves were closed on the U-Aluminum dissolver system. FIC-1C01 and FIC-1D01 or FIC-1F14A needed to be open to allow a nitrogen purge in the dissolver to protect against a Hydrogen explosion in the enclosure or at the dissolver/enclosure interface. PREVENTION OR MITIGATION: Other controls were in place to partially mitigate a potential hydrogen explosion that was analyzed in support of the Integrated Safety Analysis for the operations at Bldg. [DELETED]. A nitrogen trickle system provides sufficient flow of nitrogen to the dissolvers during dissolution to provide 5 volumetric changeouts in 30 minutes. The trickle nitrogen flow was available for the operator to access the dissolvers one hour after dissolution. Enclosures 1C01/1C11 and 1D01/1D11 did have an air sweep to the enclosure ventilation system. Should hydrogen have leaked or migrated to the enclosure upon opening of the dissolver lid, the purge would have maintained the hydrogen concentration below the lower explosive limit. ADDITIONAL ACTIONS: Upon discovery of valve closure, valves were immediately opened and Safety Department notified. EVENT STATUS: Terminated. The licensee notified the NRC Resident Inspector. * * 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 41097 +/-
Where
Nuclear Fuel Services Inc. Erwin, Tennessee (NRC Region 2)
License number:	SNM-124
Reporting

Other Unspec Reqmnt
Time - Person (Reporting Time:+-2.47 h-0.103 days <br />-0.0147 weeks <br />-0.00338 months <br />)
Opened:	Scott Kirk 10:42 Oct 6, 2004
NRC Officer:	Arlon Costa
Last Updated:	May 11, 2008
41097 - NRC Website
v • d • e

v t e Emergency Notification System
Nuclear Fuel Services Inc. with Other Unspec Reqmnt
WEEKMONTHYEAR2008-07-14T12:30:00 [Table view]
[ENS list for Nuclear Fuel Services Inc.]

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