ENS 54263

v t e ENS Event
17:09 Sep 7, 2019
Title	Automatic Reactor Trip
Event Description	At 1309 EDT on September 7, 2019, with the unit in Mode 1 at approximately 95 percent power, the reactor automatically tripped during main turbine valve testing. 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 turbine bypass valves discharging steam to the main condenser. 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 cause of the reactor protection system actuation is under evaluation. There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified.

ENS 54263 +/-
Where
Davis Besse Ohio (NRC Region 3)
Reporting

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation
LER:	05000346/LER-2019-003 Anticipatory Reactor Trip System Actuated During Turbine Stop Valve Testing Due to the Closure of a Main Turbine Stop Valve
Time - Person (Reporting Time:+-1.27 h-0.0529 days <br />-0.00756 weeks <br />-0.00174 months <br />)
Opened:	Tim Thompson 15:53 Sep 7, 2019
NRC Officer:	Andrew Waugh
Last Updated:	Sep 7, 2019
54263 - NRC Website Loading map...
v • d • e

v t e Emergency Notification System
Davis Besse with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation
WEEKMONTHYEAR2021-07-09T01:54:00 [Table view]
[ENS list for Davis Besse]

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