ENS 44890
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ENS Event | |
|---|---|
19:40 Mar 4, 2009 | |
| Title | Glovebox Overflow Drains May Be Inadequate to Perform Their Safety Function |
| Event Description | Many gloveboxes in the processing areas are equipped with overflow drains to prevent solution from exceeding an unsafe depth. These overflow drains are sized to accommodate the credible flow rates into the associated gloveboxes. During the generation of set-point analyses for overflow drains in a new process area, questions arose regarding how the drain discharge flow rates are calculated. To resolve these questions, NFS performed field tests using a glovebox on 2/26/2009 and 2/27/2009. Initial results of these tests indicated that the discharge flow rates are sensitive to drain weir height and glovebox floor flatness. This caused NFS to question the ability of the drains to perform their intended function. NFS, therefore, generated a plant-wide list of all potentially affected gloveboxes and suspended operations in them on 2/27/2009. Uranium-bearing materials were removed from the gloveboxes and all of the affected gloveboxes were tagged out of service. Engineering evaluations of the affected gloveboxes were performed and proceeded through 3/4/2009. As a result of Engineering evaluations, it was determined that in some instances a single drain alone was not capable of maintaining a solution depth to within design parameters in some localized areas within the glovebox. Modifications are being made to the drains to restore their functionality.
There were no actual or potential safety consequences to the public or the environment. The potential criticality consequences to the workers were low due to the conservatisms included in the analyses. The licensee has notified the NRC Resident Inspector.
The licensee will issue a press release to summarize the results of NRC Special Inspection Report No. 2009-007. The licensee will inform the NRC Resident Inspector. Notified R2DO (Ernstes), NMSS (Bjorkman) and Fuels Grp via email. |
| Where | |
|---|---|
| Nuclear Fuel Services Inc. Erwin, Tennessee (NRC Region 2) | |
| License number: | SNM-124 |
| Reporting | |
| 10 CFR 70.74 APP. A Part 70 App A (C) | |
| Time - Person (Reporting Time:+-4.35 h-0.181 days <br />-0.0259 weeks <br />-0.00596 months <br />) | |
| Opened: | Randy Shackleford 15:19 Mar 4, 2009 |
| NRC Officer: | Joe O'Hara |
| Last Updated: | Apr 30, 2009 |
| 44890 - NRC Website | |
Nuclear Fuel Services Inc. with Part 70 App A (C), 10 CFR 70.74 APP. A | |
WEEKMONTHYEARENS 563262023-01-30T15:30:00030 January 2023 15:30:00
[Table view]Part 70 App A (C) Concurrent Report - News Release ENS 552182021-04-27T21:30:00027 April 2021 21:30:00 Part 70 App A (C) Concurrent Report - Immediate Report to the Texas Department of State Health Services ENS 535732018-08-29T04:00:00029 August 2018 04:00:00 Part 70 App A (C) Concurrent Report for an Offsite Notification Made to the State of Tennessee ENS 533842018-05-04T15:45:0004 May 2018 15:45:00 Part 70 App A (C) Concurrent Report for an Offsite Notification Made to the State of Tennessee ENS 475782012-01-09T16:55:0009 January 2012 16:55:00 Part 70 App A (C) Report to Offsite Government Agencies and Press Release Due to a Chemical Spill Onsite ENS 456012009-12-31T10:17:00031 December 2009 10:17:00 Part 70 App A (C) Temporarily Suspend Certain Process Areas ENS 448902009-03-04T19:40:0004 March 2009 19:40:00 Part 70 App A (C), 10 CFR 70.74 APP. A Glovebox Overflow Drains May Be Inadequate to Perform Their Safety Function ENS 445792008-10-17T20:15:00017 October 2008 20:15:00 10 CFR 70.74 APP. A Inadvertent Transfer of Unsampled Discard Solution ENS 412742004-12-18T03:30:00018 December 2004 03:30:00 10 CFR 70.74 APP. A
2023-01-30T15:30:00 | |
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