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At approximately 1330 hours on October 2, … At approximately 1330 hours 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.</br>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. </br>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. </br>As a result, this event is being reported pursuant to 10CFR70 Appendix A (b)(1). </br>SAFETY SIGNIFICANCE OF THE EVENT - Low Safety Significance - No unsafe conditions existed due to this event.</br>SAFETY EQUIPMENT STATUS - Safety equipment associated with the sintering furnace operation is functional.</br>STATUS OF CORRECTIVE ACTIONS - The sintering furnace operation remains shutdown pending investigation and implementation of corrective actions.</br>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.egion 2 has been notified by the facility.
17:30:00, 2 October 2010 +
46,305 +
12:58:00, 3 October 2010 +
17:30:00, 2 October 2010 +
At approximately 1330 hours on October 2, … At approximately 1330 hours 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.</br>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. </br>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. </br>As a result, this event is being reported pursuant to 10CFR70 Appendix A (b)(1). </br>SAFETY SIGNIFICANCE OF THE EVENT - Low Safety Significance - No unsafe conditions existed due to this event.</br>SAFETY EQUIPMENT STATUS - Safety equipment associated with the sintering furnace operation is functional.</br>STATUS OF CORRECTIVE ACTIONS - The sintering furnace operation remains shutdown pending investigation and implementation of corrective actions.</br>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.egion 2 has been notified by the facility.
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00:00:00, 3 October 2010 +
SNM-1097 +
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23:22:17, 24 November 2018 +
12:58:00, 3 October 2010 +
0.811 d (19.47 hours, 0.116 weeks, 0.0267 months) +
17:30:00, 2 October 2010 +
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