Event Notification Report for January 01, 2010
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
12/31/2009 - 01/01/2010
EVENT NUMBERS
45603
Power Reactor
Event Number: 45603
Facility: DUANE ARNOLD
Region: 3 State: IA
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: STEPHEN SPEIRS
HQ OPS Officer: JOE O'HARA
Region: 3 State: IA
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: STEPHEN SPEIRS
HQ OPS Officer: JOE O'HARA
Notification Date: 01/02/2010
Notification Time: 04:12 [ET]
Event Date: 01/01/2010
Event Time: 23:10 [CST]
Last Update Date: 01/02/2010
Notification Time: 04:12 [ET]
Event Date: 01/01/2010
Event Time: 23:10 [CST]
Last Update Date: 01/02/2010
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
10 CFR Section:
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
JOHN GIESSNER (R3DO)
JOHN GIESSNER (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 |
DIESEL GENERATOR AUTO START DUE TO FAILED LINE ARRESTOR IN SWITCHYARD
"This report is being made under 10CFR50.72(b)(3)(iv)(A), 'Any event or condition that results in valid actuation of any of the systems listed in Paragraph (b)(3)(iv)(B) of this section' due to an auto start of the 'A' Standby Diesel Generator.
"The auto start of the 'A' Standby Diesel Generator occurred on a valid bus undervoltage condition caused by a momentary fault on the 161 kV Vinton line. Switchyard inspection revealed a failed 161 kV line arrestor [on] one of the phases of the Vinton line. The 'A' Standby Diesel Generator supply breaker was not required to close onto its respective essential bus as it remained powered from its normal power supply, 1X003 Start-up Transformer, during and after the event. Offsite power remained fully operable during and following the event. The 'A' Standby Diesel Generator has been returned to the standby/readiness condition.
"As designed, the 'A' Emergency Service Water systems auto started when the 'A' Standby Diesel Generator started. The Emergency Service Water systems have been returned to the standby/readiness condition.
"The 'B' Well Water Pump tripped as a result of the electrical transient. The 'A' Well Water pump and 'B' Emergency Service Water pump were manually started by operators in accordance with Abnormal Operating Procedure 408, Well Water System Abnormal Operation.
"The in-service Reactor Water Cleanup pump tripped which removed RWCU from service. The RWCU system has been returned to service.
"The in-service Spent Fuel Pool Cooling pump tripped as a result of the electrical transient. Spent Fuel Pool Cooling has been returned to service. Spent fuel pool temperature rose 0.7 [degrees] F while the pump was out of service.
"All ECCS systems were available before the event and have remained available following the event."
The licensee is not in any Technical Specification LCO's as a result of this event. The in-service Spent Fuel Pool Cooling pump was OOS for approximately 58 minutes.
The NRC Resident Inspector has been notified.
"This report is being made under 10CFR50.72(b)(3)(iv)(A), 'Any event or condition that results in valid actuation of any of the systems listed in Paragraph (b)(3)(iv)(B) of this section' due to an auto start of the 'A' Standby Diesel Generator.
"The auto start of the 'A' Standby Diesel Generator occurred on a valid bus undervoltage condition caused by a momentary fault on the 161 kV Vinton line. Switchyard inspection revealed a failed 161 kV line arrestor [on] one of the phases of the Vinton line. The 'A' Standby Diesel Generator supply breaker was not required to close onto its respective essential bus as it remained powered from its normal power supply, 1X003 Start-up Transformer, during and after the event. Offsite power remained fully operable during and following the event. The 'A' Standby Diesel Generator has been returned to the standby/readiness condition.
"As designed, the 'A' Emergency Service Water systems auto started when the 'A' Standby Diesel Generator started. The Emergency Service Water systems have been returned to the standby/readiness condition.
"The 'B' Well Water Pump tripped as a result of the electrical transient. The 'A' Well Water pump and 'B' Emergency Service Water pump were manually started by operators in accordance with Abnormal Operating Procedure 408, Well Water System Abnormal Operation.
"The in-service Reactor Water Cleanup pump tripped which removed RWCU from service. The RWCU system has been returned to service.
"The in-service Spent Fuel Pool Cooling pump tripped as a result of the electrical transient. Spent Fuel Pool Cooling has been returned to service. Spent fuel pool temperature rose 0.7 [degrees] F while the pump was out of service.
"All ECCS systems were available before the event and have remained available following the event."
The licensee is not in any Technical Specification LCO's as a result of this event. The in-service Spent Fuel Pool Cooling pump was OOS for approximately 58 minutes.
The NRC Resident Inspector has been notified.