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| Start date | Reporting criterion | Title | Event description | System | LER | |
|---|---|---|---|---|---|---|
| ENS 44417 | 15 August 2008 14:11:00 | 10 CFR 74.57 | Incident Report on Unresolved Material Discrepancy Alarm | 10 CFR 74.57(c) requires notification of any MC&A (Material Control and Accountability) alarm that remains unresolved beyond the time period specified for its resolution in the licensee's Fundamental Nuclear Material Control Plan. In the Solvent Extraction area of Building 333, (there is an abrupt alarm value.) When the alarm test was run on 8/15/2008, the input minus output value (exceeded the abrupt alarm value.) The investigation is completed but the alarm is not resolved. Measurement data for one of the inputs is the most assignable cause. Although an assignable cause was not identified, there is no indication that a material loss has occurred. The affected solvent extraction process has been shutdown by the license while alarm resolution is in progress. The NRC Resident Inspector has been notified. | ||
| ENS 44435 | 22 August 2008 02:30:00 | 10 CFR 74.57 | Materials Control & Accountability Alarm Procedure Initiated | 10CFR74.57(f)(2) requires notification within 24 hours that an MC&A (Material Control & Accountability) alarm resolution procedure has been initiated. Because an alarm investigation was initiated, a notification to the NRC Operations Center was made. Additional sampling later indicated the value was below the abrupt alarm value and this was communicated to the NRC Operations Center. There is no indication that a material loss has occurred. There were no actual or potential safety consequences to workers, the public, or the environment. MC&A alarm tests were run as specified by applicable procedures and requirements. Based on the alarm test for the Building 333 Oxide Dissolution area, the alarm test value was exceeded. Additional sampling later indicated that the input minus the output value is below the alarm value. An investigation was initiated and additional sampling has indicated that the input minus the output value is below the alarm value. The licensee has notified the NRC Resident Inspector. | ||
| ENS 46064 | 1 July 2010 23:18:00 | 10 CFR 74.57 | Material Control and Accountability (Mc&A) Alarm Actuation | 10 CFR 74.57(f)(2) requires notification within 24 hours that an MC&A alarm resolution procedure has been initiated. Because the alarm investigation has been initiated, this notification is being made. There is no indication that a material loss has occurred. Material processing operations related to this alarm have been suspended. The NRC Resident Inspector has been notified.
The investigation from the MC&A alarm resolution procedure has been successfully completed. No material loss occurred, and the alarm was caused by the material being held up in the process. Notified R2DO (Widmann), NMSS EO (Pstrak), and Fuels OUO Group via email. | ||
| ENS 46079 | 8 July 2010 18:33:00 | 10 CFR 74.57 | Material Control and Accountability (Mc&A) Alarm Actuation | 10 CFR 74.57 (f) (2) requires notification within 24 hours that an MC&A alarm resolution procedure has been initiated. The input minus output value exceeded the limit in the Solvent Extraction Area of Building 333. The input minus output value has been resolved. There is no indication that a material loss has occurred. There were no actual or potential safety consequences to workers, the public, or the environment. An input minus output process monitoring material balance was calculated for the Building 333 Solvent Extraction Area as specified by applicable procedures and requirements. The input minus output value exceeded the limit. An investigation was initiated. The licensee has notified the NRC Resident Inspector. Similar EN #46064. | ||
| ENS 46608 | 10 February 2011 22:02:00 | 10 CFR 74.57 | Material Control and Accountability (Mc&A) Alarm Resolution | 10 CFR 74.57 (f) (2) requires notification within 24 hours that an MC&A alarm resolution procedure has been initiated. In the solvent extraction area of Building 333, the input minus output value exceeded the MC&A limit. Because the alarm investigation procedure has been initiated, this notification is being made. There is no indication that a material loss has occurred. There were no actual or potential safety consequences to workers, the public, or the environment. The licensee has notified NRC Region 2 and the NRC Resident Inspector. | ||
| ENS 47060 | 14 July 2011 21:04:00 | 10 CFR 74.57 | Initiation of Material Control and Accounting Resolution Procedure | 10CFR74.57(f)(2) requires notification within 24 hours that an MC&A (Material Control and Accounting) alarm resolution procedure has been initiated. In the solvent extraction area of Building 333, the input minus output value exceeded the MC&A limit. Because the alarm investigation procedure has been initiated, this notification is being made. There is no indication that a material loss has occurred. MC&A process monitoring tests for material balance were run as specified by applicable procedures and requirements. Based on the test results for the Building 333 solvent extraction area, the test limit was exceeded. An investigation is currently underway to resolve the issue. There were no actual or potential safety consequences to workers, the public, or the environment. The licensee has notified the NRC Resident Inspector. | ||
| ENS 48228 | 23 August 2012 23:45:00 | 10 CFR 74.57 | Material Control and Accountability Alarm Resolution | 10 CFR 74.57 (f)(2) requires notification within 24 hours that a Material Control & Accountability (MC&A) alarm resolution procedure has been initiated. In the Solvent Extraction Area of Building 333, the input minus output value exceeded the MC&A limit. Because the alarm investigation procedure has been initiated, this notification is being made. There was no material loss and the issue was resolved on 8/24/2012. MC&A process monitoring tests for material balance were run as specified by applicable procedures and requirements. Based on the test results for Building 333 solvent extraction area, the test limit was exceeded. The investigation was completed and the alarm was resolved on 8/24/2012. There was no actual or potential safety consequences to workers, the public, or the environment. The NRC Resident Inspector has been informed. |