ENS 54040
ENS Event | |
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21:43 May 1, 2019 | |
Title | En Revision Imported Date 5/9/2019 |
Event Description | EN Revision Text: MANUAL REACTOR TRIP DUE TO MISALIGNED CONTROL ROD
At 1643 [CDT], with Unit 2 in Mode 2 during low power physics testing, the reactor was manually tripped per procedure due to a misaligned control rod. The trip was not complex, with all systems responding normally post-trip. Operations responded and stabilized the plant. Decay heat is being removed by discharging steam to the atmosphere using the atmospheric relief valves. Unit 1 is not affected. Due to the Reactor Protection System actuation, this event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B). There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified.
This Event Notification is being updated to clarify that the reactor was not critical when this event occurred. Therefore, the reporting requirement is changed from 10 CFR 50.72(b)(2)(iv)(B) to 10 CFR 50.72 (b)(3)(iv)(A). The reactor was tripped during low power physics testing. The misaligned rod was encountered during rod group insertion and the affected bank had been inserted to the extent that the reactor was subcritical when the operators tripped the reactor. The licensee notified the NRC Resident Inspector. Notified R2DO (Lopez) |
Where | |
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Farley Alabama (NRC Region 2) | |
Reporting | |
10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
Time - Person (Reporting Time:+-0.67 h-0.0279 days <br />-0.00399 weeks <br />-9.17766e-4 months <br />) | |
Opened: | Richard Langford 21:03 May 1, 2019 |
NRC Officer: | Jeff Herrera |
Last Updated: | May 8, 2019 |
54040 - NRC Website | |
Unit 2 | |
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Reactor critical | Critical |
Scram | Yes, Manual Scram |
Before | Startup (0 %) |
After | Hot Standby (0 %) |
WEEKMONTHYEARENS 569712024-02-16T11:34:00016 February 2024 11:34:00
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