Event Notification Report for January 27, 2011
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
01/26/2011 - 01/27/2011
EVENT NUMBERS
46590
Power Reactor
Event Number: 46590
Facility: FORT CALHOUN
Region: 4 State: NE
Unit: [1] [] []
RX Type: (1) CE
NRC Notified By: ERICK MATZKE
HQ OPS Officer: DONALD NORWOOD
Region: 4 State: NE
Unit: [1] [] []
RX Type: (1) CE
NRC Notified By: ERICK MATZKE
HQ OPS Officer: DONALD NORWOOD
Notification Date: 02/03/2011
Notification Time: 17:40 [ET]
Event Date: 01/27/2011
Event Time: 16:23 [CST]
Last Update Date: 02/03/2011
Notification Time: 17:40 [ET]
Event Date: 01/27/2011
Event Time: 16:23 [CST]
Last Update Date: 02/03/2011
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Person (Organization):
LINDA HOWELL (R4DO)
LINDA HOWELL (R4DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
UNSEALED PENETRATIONS DISCOVERED IN THE INTAKE STRUCTURE
"During a walkdown of the Intake Structure conducted on January 27, 2011, to identify any penetrations in the exterior envelope of the building, four unsealed conduit penetrations [each penetration was four inches in diameter] were identified. These penetrations are concealed within a junction box on the northwest corner of the building. The penetrations are at an elevation of approximately 1006 ft. - 1007 ft. mean sea level (MSL). Flooding through the penetrations could have impacted the ability of all the station raw water pumps to perform their design accident mitigation functions.
"This eight-hour notification is being made pursuant to 10CFR50.72(b)(3)(v). This report should have been made on January 27, 2011, and is late. Subsequent review of the issue determined this reportability.
"The river level has been less than 990 ft MSL since January 27, 2011. There have not been any indications of conditions that might result in a flood. The penetrations have been temporarily plugged. A permanent modification is in progress."
The penetrations were sealed on February 2, 2011. The licensee notified the NRC Resident Inspector.
"During a walkdown of the Intake Structure conducted on January 27, 2011, to identify any penetrations in the exterior envelope of the building, four unsealed conduit penetrations [each penetration was four inches in diameter] were identified. These penetrations are concealed within a junction box on the northwest corner of the building. The penetrations are at an elevation of approximately 1006 ft. - 1007 ft. mean sea level (MSL). Flooding through the penetrations could have impacted the ability of all the station raw water pumps to perform their design accident mitigation functions.
"This eight-hour notification is being made pursuant to 10CFR50.72(b)(3)(v). This report should have been made on January 27, 2011, and is late. Subsequent review of the issue determined this reportability.
"The river level has been less than 990 ft MSL since January 27, 2011. There have not been any indications of conditions that might result in a flood. The penetrations have been temporarily plugged. A permanent modification is in progress."
The penetrations were sealed on February 2, 2011. The licensee notified the NRC Resident Inspector.