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Event Notification Report for August 13, 2018

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
8/12/2018 - 8/13/2018

** EVENT NUMBERS **


53476 53548

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!!!!! THIS EVENT HAS BEEN RETRACTED.THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor Event Number: 53476
Facility: COOPER
Region: 4     State: NE
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: RANDY KOUBA
HQ OPS Officer: ANDREW WAUGH
Notification Date: 06/26/2018
Notification Time: 23:29 [ET]
Event Date: 06/26/2018
Event Time: 16:30 [CDT]
Last Update Date: 08/13/2018
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Person (Organization):
RYAN ALEXANDER (R4DO)
Unit SCRAM Code RX Crit Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 100 Power Operation 100 Power Operation

Event Text

CONTROL ROOM EMERGENCY FILTRATION SYSTEM DECLARED INOPERABLE

"On June 26, 2018, at 1630 CDT, the Control Room Emergency Filtration System (CREFS) was declared inoperable when Main Control Room Supply Fan SF-C-1B was discovered to have elevated vibrations that brought into question the ability to meet its mission time.

"CREFS is a single train safety system. Per 10 CFR 50.72(b)(3)(v)(D), an 8 hour report is required due to the fact that at the time of discovery this condition could have prevented the fulfillment of a safety function of an SSC [System Structure or Component] that is required to mitigate the consequences of an accident.

"The licensee has notified the NRC Senior Resident Inspector."

* * * RETRACTION FROM THOMAS FORLAND TO VINCE KLCO ON 8/13/18 AT 1024 EDT * * *

The following retraction was received from Cooper Nuclear Station (CNS) via facsimile and phone call:

"CNS is retracting the 8-hour non-emergency notification made on June 26, 2018 at 1630 CDT (EN# 53476). Subsequent evaluation concluded that overall vibration levels were not at a level that would impact the ability of the Main Control Room Supply Fan SF-C-18 to perform its safety function for its required mission time and the CREFS therefore, was operable.

"The NRC Senior Resident Inspector has been notified."

Notified the R4DO (Deese).

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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
2 N Y 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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