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Event Notification Report for August 12, 2018

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
8/11/2018 - 8/12/2018

** EVENT NUMBERS **

Power Reactor	Event Number: 53548
Facility: BEAVER VALLEY Region: 1 State: PA Unit: [] [2] [] RX Type: [1] W-3-LP,[2] W-3-LP NRC Notified By: ROB KLINDWORTH HQ OPS Officer: RICHARD SMITH	Notification Date: 08/12/2018 Notification Time: 02:58 [ET] Event Date: 08/12/2018 Event Time: 01:58 [EDT] Last Update Date: 08/16/2018
Emergency Class: NON EMERGENCY 10 CFR Section: 50.72(b)(2)(i) - PLANT S/D REQD BY TS 50.72(b)(3)(ii)(B) - UNANALYZED CONDITION	Person (Organization): CHRISTOPHER CAHILL (R1DO)

Unit

SCRAM Code

RX Crit

Initial PWR

Initial RX Mode

Current PWR

Current RX Mode

100

Power Operation

100

Power Operation

Event Text

TECHNICAL SPECIFICATION REQUIRED SHUTDOWN - LOSS OF 480 VOLTAGE EMERGENCY BUS

"On 8-12-18 at 0158 EDT, Beaver Valley Unit 2 experienced a loss of 480 Volt 2P Emergency Bus. This resulted in a Loss of Safety Function due to the 2-2 Emergency Diesel Generator [EDG] being Inoperable coincident with the Residual Heat Release Valve (2SVS-HCV104). A Technical Specification shutdown is required per LCO 3.0.3."

The Licensee also stated they were in an unanalyzed condition due to the EDG and Residual Heat Release Valve being inoperable at the same time.

The Licensee is shutting down to Mode 5 (Cold Shutdown).

The Licensee is notifying the Resident Inspector.

The Licensee will be making a Press Release about the unplanned shutdown.

* * * UPDATE ON 08/16/2018 AT 1424 EDT FROM BLASE BARTKO TO KEN MOTT * * *

"On 8-12-18 at 0158 [EDT] Beaver Valley Unit 2 experienced a loss of 480 Volt 2P Emergency Bus. Per operational guidance, this was determined to be a Loss of Safety Function due to the Unit 2 Emergency Diesel Generator (EDG) being INOPERABLE coincident with the Residual Heat Release Valve (2SVS-HCV104) 10 CFR 50.72(b)(3)(v)(B) and (D). This was also reported as an Unanalyzed Condition 10 CFR 50.72(b)(3)(ii)(b).

"No Press Release was performed for this event.

"The NRC Resident Inspector was notified.

"At 0410 [EDT] a Technical Specification Shutdown was commenced 10 CFR 50.72(b)(2)(i).

"At 2011 [EDT] the 480 Volt 2P Emergency Bus was restored and energized.

"Further evaluation of the event has determined that this event was not an Unanalyzed Condition and did not result in a Loss of Safety Function. The classifications of Unanalyzed Condition and Loss of Safety Function are being retracted.

"The accuracy of the existing guidance relative to Safety Function has been entered in the Corrective Action Program and interim actions have been taken to provide accurate guidance."

Notified R1DO (Young) via email.

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