Event Notification Report for October 10, 2026
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Event Text
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
10/09/2026 - 10/10/2026
EVENT NUMBERS
58478
Fuel Cycle Facility
Event Number: 58478
Facility: Louisiana Energy Services
Region: 2 State: NM
Unit: [] [] []
RX Type:
Comments: Uranium Enrichment Facility
Gas Centrifuge Facility
NRC Notified By: Eric Travis
HQ OPS Officer: Josue Ramirez
Region: 2 State: NM
Unit: [] [] []
RX Type:
Comments: Uranium Enrichment Facility
Gas Centrifuge Facility
NRC Notified By: Eric Travis
HQ OPS Officer: Josue Ramirez
Notification Date: 10/02/2026
Notification Time: 09:51 [ET]
Event Date: 10/01/2026
Event Time: 11:01 [MDT]
Last Update Date: 10/02/2026
Notification Time: 09:51 [ET]
Event Date: 10/01/2026
Event Time: 11:01 [MDT]
Last Update Date: 10/02/2026
Emergency Class: Non Emergency
10 CFR Section:
PART 70 APP A (b)(1) - Unanalyzed Condition
10 CFR Section:
PART 70 APP A (b)(1) - Unanalyzed Condition
Person (Organization):
NMSS_EVENTS_NOTIFICATION (EMAIL)
Peterka, Nicholas (NMSS)
NMSS_EVENTS_NOTIFICATION (EMAIL)
Peterka, Nicholas (NMSS)
UNANALYZED CONDITION
The following information was provided by the licensee via phone and email:
"The facility is in a safe and stable configuration and no accident has occurred.
"A question was raised as to whether Urenco USA (UUSA) is missing an accident sequence for sub-sampling an overfilled '1S' bottle (above the ANSI N14.1 limit) or if such an event can be determined to be not credible due to a series of unlikely human errors or events. Instances of overfilled '1S' bottles have occurred during the autoclave sampling process; however, these bottles are identified and removed from the sub-sampling process in accordance with established procedures. Those procedural steps are not preserved as an item relied on for safety (IROFS). No bottles have been sub-sampled that potentially needed an IROFS.
"Existing analyses address overheating of '1S' bottles normally filled for sub-sampling (less than or equal to 450 g), but do not specifically address an overfilled condition. Although '1S' sample bottles contain less than 1 kg of uranium hexafluoride (UF6), sub-sampling an overfilled '1S' bottle may result in a condition not currently evaluated in the integrated safety analysis (ISA).
"Corrective actions have begun."
The following information was provided by the licensee via phone and email:
"The facility is in a safe and stable configuration and no accident has occurred.
"A question was raised as to whether Urenco USA (UUSA) is missing an accident sequence for sub-sampling an overfilled '1S' bottle (above the ANSI N14.1 limit) or if such an event can be determined to be not credible due to a series of unlikely human errors or events. Instances of overfilled '1S' bottles have occurred during the autoclave sampling process; however, these bottles are identified and removed from the sub-sampling process in accordance with established procedures. Those procedural steps are not preserved as an item relied on for safety (IROFS). No bottles have been sub-sampled that potentially needed an IROFS.
"Existing analyses address overheating of '1S' bottles normally filled for sub-sampling (less than or equal to 450 g), but do not specifically address an overfilled condition. Although '1S' sample bottles contain less than 1 kg of uranium hexafluoride (UF6), sub-sampling an overfilled '1S' bottle may result in a condition not currently evaluated in the integrated safety analysis (ISA).
"Corrective actions have begun."
Page Last Reviewed/Updated October 10, 2026, 05:20 am EDT