Event Notification Report for May 26, 2014
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
05/25/2014 - 05/26/2014
EVENT NUMBERS
50143
Power Reactor
Event Number: 50143
Facility: DAVIS BESSE
Region: 3 State: OH
Unit: [1] [] []
RX Type: [1] B&W-R-LP
NRC Notified By: ERIC HORVATH
HQ OPS Officer: DONALD NORWOOD
Region: 3 State: OH
Unit: [1] [] []
RX Type: [1] B&W-R-LP
NRC Notified By: ERIC HORVATH
HQ OPS Officer: DONALD NORWOOD
Notification Date: 05/26/2014
Notification Time: 10:39 [ET]
Event Date: 05/26/2014
Event Time: 02:52 [EDT]
Last Update Date: 05/26/2014
Notification Time: 10:39 [ET]
Event Date: 05/26/2014
Event Time: 02:52 [EDT]
Last Update Date: 05/26/2014
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
STEVE ORTH (R3DO)
STEVE ORTH (R3DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
CONTROL ROOM OVERHEAD ANNUNCIATOR MALFUNCTION
"At time 0252 EDT, the control room overhead annunciators malfunctioned resulting in the inability to receive more than one station alarm input and could not be acknowledged using the normal station alarm acknowledge pushbutton.
"This condition existed from time 0252 EDT until time 0516 EDT on 5/26/2014 at which time the system was restored. During the entire period, backup assessment capability was functional, dependent upon redundant assets as described in existing station documentation and/or functionality of the control room alarm typer. Additionally, the station computer alarms and Safety Parameter Display System remained functional during the entire time period.
"The licensee will continue to investigate the annunciator system.
"The licensee notified the NRC Resident Inspector."
The licensee will also notify State and local government agencies.
"At time 0252 EDT, the control room overhead annunciators malfunctioned resulting in the inability to receive more than one station alarm input and could not be acknowledged using the normal station alarm acknowledge pushbutton.
"This condition existed from time 0252 EDT until time 0516 EDT on 5/26/2014 at which time the system was restored. During the entire period, backup assessment capability was functional, dependent upon redundant assets as described in existing station documentation and/or functionality of the control room alarm typer. Additionally, the station computer alarms and Safety Parameter Display System remained functional during the entire time period.
"The licensee will continue to investigate the annunciator system.
"The licensee notified the NRC Resident Inspector."
The licensee will also notify State and local government agencies.