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Alert

Due to a lapse in appropriations, the NRC has ceased normal operations. However, excepted and exempted activities necessary to maintain critical health and safety functions—as well as essential progress on designated critical activities, including those specified in Executive Order 14300—will continue, consistent with the OMB-Approved NRC Lapse Plan.

Event Notification Report for July 26, 2017

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
07/25/2017 - 07/26/2017

** EVENT NUMBERS **
 
52785 52871 52872

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!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor Event Number: 52785
Facility: FARLEY
Region: 2 State: AL
Unit: [1] [ ] [ ]
RX Type: [1] W-3-LP,[2] W-3-LP
NRC Notified By: CHARLES BAREFIELD
HQ OPS Officer: DONG HWA PARK		 Notification Date: 06/02/2017
Notification Time: 17:07 [ET]
Event Date: 06/02/2017
Event Time: 09:20 [CDT]
Last Update Date: 07/25/2017
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(C) - POT UNCNTRL RAD REL		 Person (Organization):
SCOTT SHAEFFER (R2DO)
 
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

PENETRATION ROOM FILTRATION BOUNDARY INOPERABLE

"This notification is being made as required by 10 CFR 50.72(b)(3)(v) due to both trains of Penetration Room Filtration [PRF] being inoperable due to an inoperable PRF Boundary. At 0920 [CDT] on 6/2/2017, a gap was discovered between an electrical penetration room ceiling and the containment wall where seismic gap material was noted to be missing. The gap was subsequently closed and PRF testing completed sat. The condition was exited at 1345 [CDT].

The licensee notified the NRC Resident Inspector.

* * * RETRACTION ON 7/25/17 AT 1725 EDT FROM MATT STANLEY TO DONG PARK * * *

"On 6/2/17 at 1707 CDT Farley Nuclear Plant notified the NRC Operations Center of an entry into Technical Specification 3.7.12 Condition B for Unit 1 loss of two trains of Penetration Room Filtration (PRF). At 0920 [CDT] on 6/2/2017, a gap had been discovered between an electrical penetration and containment where seismic gap material was noted to be missing. The report was made pursuant to 10 CFR 50.72(b)(3)(v) under Event Notification 52785. Upon further engineering review and satisfactory testing to support operability, Farley has determined that the configuration did not meet the criteria for a condition that could have prevented fulfillment of a safety function, and is retracting the notification.

"The NRC Resident Inspector has been notified."

Notified R2DO (Blamey).

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Power Reactor Event Number: 52871
Facility: LIMERICK
Region: 1 State: PA
Unit: [1] [2] [ ]
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: MATTHEW BONANNO
HQ OPS Officer: VINCE KLCO		 Notification Date: 07/24/2017
Notification Time: 23:50 [ET]
Event Date: 07/24/2017
Event Time: 20:44 [EDT]
Last Update Date: 07/25/2017
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(xi) - OFFSITE NOTIFICATION		 Person (Organization):
DAN SCHROEDER (R1DO)
 
Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 100 Power Operation 100 Power Operation
2 N Y 100 Power Operation 100 Power Operation

Event Text

OFFSITE NOTIFICATION TO THE PENNSYLVANIA DEPARTMENT OF ENVIRONMENTAL PROTECTION

"At time [2044 EDT], Limerick Generating Station notified the Pennsylvania DEP [Department of Environmental Protection] that there was an imminent overflow of our plant waste water pond (holding pond) due to heavy rainfall in the area. Level in the plant waste water pond was approximately «" from the overflow. Prior to overflowing, plant alignment changes enabled us to lower level in the hold pond to prevent the overflow. PADEP was subsequently notified that an actual overflow condition did not occur."

The licensee notified the NRC Resident Inspector.

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Power Reactor Event Number: 52872
Facility: WATTS BAR
Region: 2 State: TN
Unit: [ ] [2] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: BRIAN MCLINAY
HQ OPS Officer: VINCE KLCO		 Notification Date: 07/25/2017
Notification Time: 11:07 [ET]
Event Date: 07/25/2017
Event Time: 04:28 [EDT]
Last Update Date: 07/25/2017
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION		 Person (Organization):
ALAN BLAMEY (R2DO)
 
Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
2 M/R N 0 Hot Standby 0 Hot Standby

Event Text

MANUAL REACTOR TRIP DUE TO ROD POSITION INDICATION SYSTEM BEING INOPERABLE

"On July 25, 2017, at 0428 Eastern Daylight Time (EDT) Watts Bar Nuclear Plant (WBN) Unit 2 was in Mode 3, beginning a Reactor Startup. While in the initial phase of withdrawing the first of four Control Rod banks, the two associated group demand position indicators deviated greater than 2 steps from each other. In accordance with Technical Requirement 3.1.7, Position Indication System, Shutdown, with one or more group demand position indicators inoperable, the reactor trip breakers are to be opened immediately. Operations personnel opened the reactor trip breakers immediately by initiating a manual trip of the Reactor Protection System (RPS). The Auxiliary Feedwater system was in service and controlling Steam Generator water levels at the time of the event and did not receive any valid actuation signals. No other system actuations occurred as a result of this reactor trip and all systems operated as designed.

"The cause of the position indication system inoperability is currently under investigation.

"NRC Resident Inspector has been notified."

Page Last Reviewed/Updated Wednesday, March 24, 2021

Page Last Reviewed/Updated Wednesday, March 24, 2021