ENS 47161
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ENS Event | |
|---|---|
16:00 Aug 16, 2011 | |
| Title | Improper Criticality Safety Evaluation |
| Event Description | As part of the ongoing GNF-A review of the Fuel Manufacturing Operation (FMO) Integrated Safety Analysis (ISA), facility walk downs of the UO2 sinter furnace area were performed that identified a configuration that had not been properly analyzed. Based on a review of this as-found condition, it was determined at approximately 12 p.m. on August 16, 2011 that a floor trench in the furnace area was improperly analyzed in a criticality safety evaluation. This resulted in a condition in which criticality controls that were documented as being necessary to meet double contingency were not maintained or available because the geometry of the trench was not properly modeled. There was not an actual loss of double contingency.
The floor trench does not normally contain uranium, and has removable covers in place to prevent material accumulation and per procedure, is routinely inspected. It was inspected during the spring maintenance shut down and was inspected again today. These inspections confirmed that no visible uranium accumulation was present. At no time was an unsafe condition present. Additional corrective actions and extent of condition are being evaluated. This event is being conservatively reported pursuant to GNF-A internal procedure reporting requirements within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of discovery. The licensee will notify North Carolina State Radiation Protection agency and the New Hanover County Emergency Coordinator. |
| Where | |
|---|---|
| Global Nuclear Fuel - Americas Wilmington, North Carolina (NRC Region 2) | |
| License number: | SNM-1097 |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+19.27 h0.803 days <br />0.115 weeks <br />0.0264 months <br />) | |
| Opened: | Scott Murray 11:16 Aug 17, 2011 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Aug 17, 2011 |
| 47161 - 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 | |
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