Event Notification Report for April 23, 2001
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
04/22/2001 - 04/23/2001
EVENT NUMBERS
37940
Power Reactor
Event Number: 37940
Facility: COOPER
Region: 4 State: NE
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: BRIAN CABLE
HQ OPS Officer: JOHN MacKINNON
Region: 4 State: NE
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: BRIAN CABLE
HQ OPS Officer: JOHN MacKINNON
Notification Date: 04/23/2001
Notification Time: 21:35 [ET]
Event Date: 04/23/2001
Event Time: 20:12 [CDT]
Last Update Date: 04/23/2001
Notification Time: 21:35 [ET]
Event Date: 04/23/2001
Event Time: 20:12 [CDT]
Last Update Date: 04/23/2001
Emergency Class: UNUSUAL EVENT
10 CFR Section:
50.72(a) (1) (i) - EMERGENCY DECLARED
10 CFR Section:
50.72(a) (1) (i) - EMERGENCY DECLARED
Person (Organization):
BILL JONES (R4)
STUART RICHARDS (NRR)
JOHN ZWOLINSKI (NRR)
KEN BROCKMAN (R4)
ELMO COLLINS (R4)
BILL JONES (R4)
STUART RICHARDS (NRR)
JOHN ZWOLINSKI (NRR)
KEN BROCKMAN (R4)
ELMO COLLINS (R4)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
LOSS OF ALL ANNUNCIATORS IN THE MAIN CONTROL ROOM
At 2012 CT, the licensee entered an Unusual Event per EAL 4.1.2, unplanned loss of most or all safety system annuncuators. Plant computer remained on line but will not give alarms. I&C Technicians have been called in to investigate. All emergency core cooling systems are fully operable, and the electrical grid is stable. The licensee notified state and county officials that they had entered an Unusual Event.
"Initial indication of loss of annunciators was received via annunciator 'Annunciator System Trouble.' Abnormal Procedure 2.4.8.2, 'Annunciator Failures,' was entered, and the determination was made that all annunciators in the Main Control Room [were] lost."
The NRC Resident Inspector was notified of this event by the licensee.
* * * UPDATE ON 04/23/01 AT 2211 ET BY S. JOBE TAKEN BY MACKINNON * * *
Unusual Event Terminated at 2105 CT.
"At 2105 [CT,] the Emergency Director exited the EAL when the Main Control Room Annunciator System 'A' was restored by re-booting the Ronan System for the Main Control Room." State and Local officials were notified that the Unusual Event was exited.
The NRC Resident Inspector will be notified of this update by the licensee.
The NRC operations center notifications were the same as the above.
At 2012 CT, the licensee entered an Unusual Event per EAL 4.1.2, unplanned loss of most or all safety system annuncuators. Plant computer remained on line but will not give alarms. I&C Technicians have been called in to investigate. All emergency core cooling systems are fully operable, and the electrical grid is stable. The licensee notified state and county officials that they had entered an Unusual Event.
"Initial indication of loss of annunciators was received via annunciator 'Annunciator System Trouble.' Abnormal Procedure 2.4.8.2, 'Annunciator Failures,' was entered, and the determination was made that all annunciators in the Main Control Room [were] lost."
The NRC Resident Inspector was notified of this event by the licensee.
* * * UPDATE ON 04/23/01 AT 2211 ET BY S. JOBE TAKEN BY MACKINNON * * *
Unusual Event Terminated at 2105 CT.
"At 2105 [CT,] the Emergency Director exited the EAL when the Main Control Room Annunciator System 'A' was restored by re-booting the Ronan System for the Main Control Room." State and Local officials were notified that the Unusual Event was exited.
The NRC Resident Inspector will be notified of this update by the licensee.
The NRC operations center notifications were the same as the above.