ENS 46305
ENS Event | |
|---|---|
17:30 Oct 2, 2010 | |
| Title | Unanalyzed Condition When Fuel Pellet Boats Became Stacked |
| Event Description | At approximately 1330 hours0.0154 days <br />0.369 hours <br />0.0022 weeks <br />5.06065e-4 months <br /> on October 2, 2010 it was discovered that boats of fuel pellets had become stacked in a UO2 sintering furnace located in the GNF-A Fuel Manufacturing Operation. The furnace had been shutdown due to an apparent boat jam, which was detected by an overload sensor on the equipment that pushes boats into the furnace. This sensor is designated as an IROFS [Item Relied On For Safety] in the ISA [Integrated Safety Analysis] Summary. The stacked boat condition was discovered after process engineering removed two boats of fuel from the entrance of the furnace as part of the boat jam investigation. With these boats removed the stacked boats could be clearly seen and proper notifications were made to management.
The sintering furnace process has independent controls on geometry, which limit the process to a single layer of boats, and moderation, which prevent water and other forms of moderator from entering the process. In this event, the geometry control was compromised however the moderation control remained intact. The stacked boat condition has been analyzed as a process upset condition and is demonstrated safe in a documented safety analysis. The IROFS that were intended to detect a misalignment of boats functioned properly during the event as the misalignment was detected. The IROFS mitigated the severity of the boat jam and the furnace operation was shutdown due to the misalignment. This event did not result in an unsafe condition, however the declared IROFS did not prevent the loss of geometry and resulted in a failure to meet performance requirements. As a result, this event is being reported pursuant to 10CFR70 Appendix A (b)(1). SAFETY SIGNIFICANCE OF THE EVENT - Low Safety Significance - No unsafe conditions existed due to this event. SAFETY EQUIPMENT STATUS - Safety equipment associated with the sintering furnace operation is functional. STATUS OF CORRECTIVE ACTIONS - The sintering furnace operation remains shutdown pending investigation and implementation of corrective actions. System design is such that boats cannot overturn and no spillage of fuel pellets has occurred. The furnace will have to cooldown before repairs can be completed. Applicable State and Local agencies will be notified by the facility. Marvin Sykes of NRC Region 2 has been notified by the facility. |
| Where | |
|---|---|
| Global Nuclear Fuel Wilmington, North Carolina (NRC Region 2) | |
| License number: | SNM-1097 |
| Reporting | |
| Part 70 App A (B)(1) | |
| Time - Person (Reporting Time:+19.47 h0.811 days <br />0.116 weeks <br />0.0267 months <br />) | |
| Opened: | Scott P. Murray 12:58 Oct 3, 2010 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Oct 3, 2010 |
| 46305 - NRC Website
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Global Nuclear Fuel with Part 70 App A (B)(1) | |
WEEKMONTHYEARENS 528112017-06-16T21:00:00016 June 2017 21:00:00
[Table view]Part 70 App A (B)(1) Unanalyzed Condition Identified ENS 507502015-01-21T20:00:00021 January 2015 20:00:00 Part 70 App A (B)(1) Dry Conversion Process Improperly Analyzed in the Current Integrated Safety Analysis ENS 502762014-07-12T21:30:00012 July 2014 21:30:00 Part 70 App A (B)(1) Items Relied on for Safety Associated with the Dry Scrap Recycle Operations Not Meeting Requirements ENS 487092013-01-30T20:30:00030 January 2013 20:30:00 Part 70 App A (B)(1) Completion of Integrated Safety Analysis Action Plan Balance of Plant Milestone ENS 486952013-01-22T20:30:00022 January 2013 20:30:00 Part 70 App A (B)(1) Unanalyzed Condition - Based on Ongoing Integrated Analysis Review ENS 485542012-12-03T18:30:0003 December 2012 18:30:00 Part 70 App A (B)(1) Items Relied on for Safety Associated with the Dry Scrap Recycle Furnace Improperly Analyzed ENS 484972012-11-09T16:00:0009 November 2012 16:00:00 Part 70 App A (B)(1) Unanalyzed Condition - System As-Found Condition Not Fully Described in Isa ENS 477052012-02-27T19:30:00027 February 2012 19:30:00 Part 70 App A (B)(1) Unanalyzed Piping Configuration Discovered ENS 473252011-10-05T18:00:0005 October 2011 18:00:00 Part 70 App A (B)(1) Item Relied on for Safety Not as Described in the Integrated Safety Analysis ENS 467102011-03-29T14:00:00029 March 2011 14:00:00 Part 70 App A (B)(1) Completion of Isa Action Plan Conversion Milestone ENS 463052010-10-02T17:30:0002 October 2010 17:30:00 Part 70 App A (B)(1) Unanalyzed Condition When Fuel Pellet Boats Became Stacked ENS 462432010-09-09T18:30:0009 September 2010 18:30:00 Part 70 App A (B)(1) Accident Evaluation Improperly Analyzed in the Integrated Safety Analysis ENS 457172010-02-23T16:00:00023 February 2010 16:00:00 Part 70 App A (B)(1) Unanalyzed Condition - Incomplete List of Safety Controls in Integrated Safety Analysis Summary ENS 454912009-11-11T20:00:00011 November 2009 20:00:00 Part 70 App A (B)(1) Incomplete Documentation of Criticality Safety Controls in Integrated Safety Analysis Summary 2017-06-16T21:00:00 | |