Event Notification Report for March 31, 2015
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
03/30/2015 - 03/31/2015
EVENT NUMBERS
50943
Power Reactor
Event Number: 50943
Facility: DUANE ARNOLD
Region: 3 State: IA
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: HANS OLSON
HQ OPS Officer: JEFF HERRERA
Region: 3 State: IA
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: HANS OLSON
HQ OPS Officer: JEFF HERRERA
Notification Date: 03/31/2015
Notification Time: 18:29 [ET]
Event Date: 03/31/2015
Event Time: 15:09 [CDT]
Last Update Date: 03/31/2015
Notification Time: 18:29 [ET]
Event Date: 03/31/2015
Event Time: 15:09 [CDT]
Last Update Date: 03/31/2015
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
Person (Organization):
ROBERT DALEY (R3DO)
ROBERT DALEY (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 |
UNANALYZED CONDITION DUE TO DEGRADED TORUS COATING
"The issue described in this report was addressed during the station's most recent refueling and maintenance outage in October of 2014 and no longer exists.
"During an inspection of Suppression Pool (torus) during the October 2014 outage, degradation of the torus coating was discovered. Some of the coating had become delaminated. NextEra Energy DAEC [Duane Arnold Energy Center] took immediate action to restore the coating to within design parameters during the refueling outage and the degraded condition no longer exists. Extensive analysis was performed to determine effect of the delaminated material. Upon completion of this investigation, NextEra Energy DAEC has determined an unanalyzed condition existed as a result of the coating degradation and is reporting the condition under 10 CFR 50.72(b)(3)(ii)(B).
"A root cause evaluation has been performed to determine causes and corrective actions.
"The NRC Resident Inspector has been notified."
"The issue described in this report was addressed during the station's most recent refueling and maintenance outage in October of 2014 and no longer exists.
"During an inspection of Suppression Pool (torus) during the October 2014 outage, degradation of the torus coating was discovered. Some of the coating had become delaminated. NextEra Energy DAEC [Duane Arnold Energy Center] took immediate action to restore the coating to within design parameters during the refueling outage and the degraded condition no longer exists. Extensive analysis was performed to determine effect of the delaminated material. Upon completion of this investigation, NextEra Energy DAEC has determined an unanalyzed condition existed as a result of the coating degradation and is reporting the condition under 10 CFR 50.72(b)(3)(ii)(B).
"A root cause evaluation has been performed to determine causes and corrective actions.
"The NRC Resident Inspector has been notified."