Event Notification Report for September 05, 2011
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
09/04/2011 - 09/05/2011
EVENT NUMBERS
47241
Power Reactor
Event Number: 47241
Facility: VERMONT YANKEE
Region: 1 State: VT
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: JAMES KRITZER
HQ OPS Officer: DONALD NORWOOD
Region: 1 State: VT
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: JAMES KRITZER
HQ OPS Officer: DONALD NORWOOD
Notification Date: 09/05/2011
Notification Time: 09:40 [ET]
Event Date: 09/05/2011
Event Time: 04:03 [EDT]
Last Update Date: 09/05/2011
Notification Time: 09:40 [ET]
Event Date: 09/05/2011
Event Time: 04:03 [EDT]
Last Update Date: 09/05/2011
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):
EUGENE DIPAOLO (R1DO)
EUGENE DIPAOLO (R1DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 98 | Power Operation | 98 | Power Operation |
LOSS OF METEROLOGICAL TOWER VERTICAL TEMPERATURE DIFFERENCE INSTRUMENTATION DUE TO LIGHTNING STRIKE
"On 9/5/11 at 0403 EDT, Vermont Yankee Nuclear Power Station experienced a lightning strike which resulted in a loss of all vertical temperature difference instrumentation.
"This condition is being reported as a loss of emergency assessment capability in accordance with 10CFR50.72(b)(3)(xiii)
"Procedure OPOP-PHEN-3127, Natural Phenomena, was entered and the lightning damage indicator walkdown checklist was performed with no additional damage found. Several other spurious alarms were received at the time of the lightning strike and are being investigated. None of these alarms indicate any other potentially reportable conditions.
"The plant is continuing normal power operation at approximately 98 percent rated thermal power.
"The NRC Resident Inspector has been informed."
The licensee reports that repairs are currently underway.
"On 9/5/11 at 0403 EDT, Vermont Yankee Nuclear Power Station experienced a lightning strike which resulted in a loss of all vertical temperature difference instrumentation.
"This condition is being reported as a loss of emergency assessment capability in accordance with 10CFR50.72(b)(3)(xiii)
"Procedure OPOP-PHEN-3127, Natural Phenomena, was entered and the lightning damage indicator walkdown checklist was performed with no additional damage found. Several other spurious alarms were received at the time of the lightning strike and are being investigated. None of these alarms indicate any other potentially reportable conditions.
"The plant is continuing normal power operation at approximately 98 percent rated thermal power.
"The NRC Resident Inspector has been informed."
The licensee reports that repairs are currently underway.