ENS 55143

v t e ENS Event
15:04 Mar 17, 2021
Title	Automatic Reactor Trip
Event Description	At 1004 EDT on March 17, 2021, with Unit 2 in Mode 1 at 90 percent power, the reactor automatically tripped due to a main turbine trip. The trip was not complex, with all systems responding normally post-trip. Operations responded and stabilized the plant. Decay heat is being removed by the Auxiliary Feedwater and Steam Dump Systems. Unit 1 is not affected. Due to the Reactor Protection System actuation while critical, this event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B). The expected actuation of the Auxiliary Feedwater System (an engineered safety feature) is being reported as an eight hour report under 10 CFR 50.72 (b)(3)(iv)(A). There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. All controls rods fully inserted and the electrical system is in normal shutdown alignment. The cause of the turbine trip is being investigated.

ENS 55143 +/-
Where
Watts Bar Tennessee (NRC Region 2)
Reporting

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation
Time - Person (Reporting Time:+-2.08 h-0.0867 days <br />-0.0124 weeks <br />-0.00285 months <br />)
Opened:	Robert Collins 12:59 Mar 17, 2021
NRC Officer:	Thomas Kendzia
Last Updated:	Mar 17, 2021
55143 - NRC Website
v • d • e

v t e Emergency Notification System
Watts Bar with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation
WEEKMONTHYEAR2024-03-05T06:32:00 [Table view]
[ENS list for Watts Bar]

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