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NRC Issues Event Notification for Davis Besse in Ohio

  • Jul 13, 2021 10:05 am GMT
Targeted News Service

WASHINGTON, July 13 -- The Nuclear Regulatory Commission issued the following event notification (No. 55346) involving Davis Besse, Ohio:

EN Revision Imported Date: 7/12/2021


"At 2154 EDT on 7/8/2021, with the Unit in Mode 1 at 100% power, the reactor automatically tripped due to trip of the main turbine, caused by failure of a non-safety related breaker during functional testing. Following the reactor trip the Steam Feed Rupture Control System automatically initiated on low Steam Generator 1 level, actuating both turbine-driven Auxiliary Feedwater Pumps. The operators subsequently started the high pressure injection pumps manually per procedure in response to overcooling indications.

"Operations responded and stabilized the plant. Decay heat was initially being removed via the Main Condenser. During post-trip response actions, while attempting to shut down the Auxiliary Feedwater Pumps, a low pressure condition was experienced in Steam Generator 2, resulting in isolation of the Main Condenser and steam being discharged through the Atmospheric Vent Valves for decay heat removal. There is no known primary to secondary leakage.

"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). This event is also being reported in accordance with 10 CFR 50.72(b)(2)(iv)(A) as a four-hour, non-emergency notification of emergency core cooling system (ECCS) discharge into the reactor coolant system, and in accordance with 10 CFR 50.72(b)(3)(iv)(A) as an eight-hour, non-emergency notification of an event that results in a valid actuation of the Auxiliary Feedwater System.

"There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified."

Power Reactor

Event Number: 55346

Facility: Davis Besse

Region: 3

State: OH

Unit: [1] [] []

RX Type: [1] B&W-R-LP

NRC Notified By: Nicholas Buehler

HQ OPS Officer: Kerby Scales

Notification Date: 07/09/2021

Notification Time: 00:44 [ET]

Event Date: 07/08/2021

Event Time: 21:54 [EDT]

Last Update Date: 07/09/2021

Emergency Class: Non Emergency

10 CFR Section:

50.72(b)(2)(iv)(B) - RPS Actuation - Critical

50.72(b)(3)(iv)(A) - Valid Specif Sys Actuation

50.72(b)(2)(iv)(A) - Eccs Injection

Person (Organization):


Table omitted:

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