Event Notification Report for April 26, 2000
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
04/25/2000 - 04/26/2000
EVENT NUMBERS
36932
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor
Event Number: 36932
Facility: KEWAUNEE
Region: 3 State: WI
Unit: [1] [] []
RX Type: [1] W-2-LP
NRC Notified By: DAVID LOHMAN
HQ OPS Officer: JOHN MacKINNON
Region: 3 State: WI
Unit: [1] [] []
RX Type: [1] W-2-LP
NRC Notified By: DAVID LOHMAN
HQ OPS Officer: JOHN MacKINNON
Notification Date: 04/26/2000
Notification Time: 16:01 [ET]
Event Date: 04/26/2000
Event Time: 13:42 [CDT]
Last Update Date: 05/01/2000
Notification Time: 16:01 [ET]
Event Date: 04/26/2000
Event Time: 13:42 [CDT]
Last Update Date: 05/01/2000
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(ii) - ESF ACTUATION
10 CFR Section:
50.72(b)(2)(ii) - ESF ACTUATION
Person (Organization):
JAMES CREED (R3)
JAMES CREED (R3)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | N | 0 | Refueling | 0 | Refueling |
AUXILIARY BUILDING SPECIAL VENTILATION AND CONTROL ROOM POST ACCIDENT RECIRCULATION ACTUATED DUE TO A STEAM EXCLUSION SIGNAL.
At 1342 CDT on 04/26/00, the Auxiliary Building Special Ventilation and Control Room Post Accident Recirculation Systems actuated due to a steam exclusion signal. Auxiliary Building Special Ventilation and Control Room Post Accident Recirculation are Engineered Safety Features Systems. The steam exclusion signal was due to the rupture disk on Boric Acid Recovery System rupturing. Steam to the Boric Acid Recovery System was isolated. At 1425 CDT, steam exclusion was reset and the Auxiliary Building Special Ventilation and Control Room Post Accident Recirculation Systems were shutdown. All equipment operated as designed. There was no radiological release. The licensee is currently investigating why the rupture disc ruptured. Nobody was injured.
The NRC Resident Inspector was notified of this event by the licensee.
* * * UPDATE 1009EDT ON 5/1/00 FROM GARY HARRINGTON TO S. SANDIN * * *
The licensee is retracting this report based on the following:
"After reviewing NUREG-1022, we have identified that the steam exclusion system and the initiating signal that caused the ESF actuations is a non-valid signal. Consequently, since the signal is not valid and the ventilation systems that were affected [special ventilation system and control room post accident recirc] are those which are excluded from reporting on inadvertent actuations, we are retracting this report."
The licensee informed the NRC Resident Inspector. Notified R3DO(Burgess).
At 1342 CDT on 04/26/00, the Auxiliary Building Special Ventilation and Control Room Post Accident Recirculation Systems actuated due to a steam exclusion signal. Auxiliary Building Special Ventilation and Control Room Post Accident Recirculation are Engineered Safety Features Systems. The steam exclusion signal was due to the rupture disk on Boric Acid Recovery System rupturing. Steam to the Boric Acid Recovery System was isolated. At 1425 CDT, steam exclusion was reset and the Auxiliary Building Special Ventilation and Control Room Post Accident Recirculation Systems were shutdown. All equipment operated as designed. There was no radiological release. The licensee is currently investigating why the rupture disc ruptured. Nobody was injured.
The NRC Resident Inspector was notified of this event by the licensee.
* * * UPDATE 1009EDT ON 5/1/00 FROM GARY HARRINGTON TO S. SANDIN * * *
The licensee is retracting this report based on the following:
"After reviewing NUREG-1022, we have identified that the steam exclusion system and the initiating signal that caused the ESF actuations is a non-valid signal. Consequently, since the signal is not valid and the ventilation systems that were affected [special ventilation system and control room post accident recirc] are those which are excluded from reporting on inadvertent actuations, we are retracting this report."
The licensee informed the NRC Resident Inspector. Notified R3DO(Burgess).