ENS 54005
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ENS Event | |
|---|---|
06:37 Apr 17, 2019 | |
| Title | Undervoltage to a Safety Related Bus Resulting in Valid System Actuation |
| Event Description | At approximately 0137 CDT, with the Plant [Callaway] in No Mode (Defueled) the "B" Switchyard Bus cleared resulting in a loss of normal power to "A" Train Safety Related Transformer XNB01. This resulted in an under voltage condition on Safety Related Bus NB01. The "A" Emergency Diesel started per design and re-energized Bus NB01. This actuated the shutdown sequencer which first sheds loads including the "A" Spent Fuel Pool Cooling Pump and started "A" Essential Service Water Pump, "A" Component Cooling Water Pump, "A" Control Room A/C and other design loads. No complications were identified. The "A" Switchyard Bus remained energized at all times. The "A" Spent Fuel Pool Cooling Pump was restarted per off normal procedure response at 0149 CDT. Spent Fuel Pool water temperature started at 102 F and rose to 103 F prior to restart. There was no movement of irradiated fuel in progress in the Fuel Building during this time. The plant remains stable in No Mode (Defueled).
At the time of the loss of "B" Switchyard Bus, the plant was closing Generator Output breaker MDV53 to establish a backfeed alignment. Further investigation is in progress. This event is reportable per 10 CFR 50.72(b)(3)(iv)(A). The NRC Senior Resident has been notified. |
| Where | |
|---|---|
Callaway  Missouri (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-0.2 h-0.00833 days <br />-0.00119 weeks <br />-2.7396e-4 months <br />) | |
| Opened: | Leland Bland 06:25 Apr 17, 2019 |
| NRC Officer: | Thomas Kendzia |
| Last Updated: | Apr 17, 2019 |
| 54005 - NRC Website
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WEEKMONTHYEARENS 570432024-03-22T01:56:00022 March 2024 01:56:00
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