Event Notification Report for April 08, 2011
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
04/07/2011 - 04/08/2011
Power Reactor
Event Number: 46741
Facility: FORT CALHOUN
Region: 4 State: NE
Unit: [1] [] []
RX Type: (1) CE
NRC Notified By: ERICK MATZKE
HQ OPS Officer: JOE O'HARA
Region: 4 State: NE
Unit: [1] [] []
RX Type: (1) CE
NRC Notified By: ERICK MATZKE
HQ OPS Officer: JOE O'HARA
Notification Date: 04/08/2011
Notification Time: 13:40 [ET]
Event Date: 04/08/2011
Event Time: 10:24 [CDT]
Last Update Date: 04/08/2011
Notification Time: 13:40 [ET]
Event Date: 04/08/2011
Event Time: 10:24 [CDT]
Last Update Date: 04/08/2011
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):
NEIL OKEEFE (R4DO)
NEIL OKEEFE (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 FLOOD BARRIER PENETRATION
"During investigations of flood barrier penetrations, one approximately 4 inch conduit has been identified that is not sealed. Reducers are installed in the conduit on the exterior side. This conduit penetrates the auxiliary building into room 56. Flooding through the penetrations could have impacted the ability of the station's safety related equipment in the auxiliary building to perform their design accident mitigation functions.
"During investigations of flood barrier penetrations, a drain flow path from the CARP building into Room 23 of the Auxiliary Building [was identified]. There is no specific procedural guidance to isolate this flow path in the event of a flood above 1007 feet. Flooding through this flow path could have impacted the ability of the station's safety related equipment to perform their design accident mitigation functions.
"This eight-hour notification is being made pursuant to 10 CFR 50.72 (b)(3)(v)(D).
"The penetrations and CARP building drains are at an approximate elevation of 1007 feet. The river level has been less than 997 feet Mean Sea Level (MSL) since prior to December 1, 2010. The safety related equipment is currently operable. There are not any indications of conditions that might result in a flood. Compensatory actions have been identified."
"The NRC Resident Inspector has been notified."
"During investigations of flood barrier penetrations, one approximately 4 inch conduit has been identified that is not sealed. Reducers are installed in the conduit on the exterior side. This conduit penetrates the auxiliary building into room 56. Flooding through the penetrations could have impacted the ability of the station's safety related equipment in the auxiliary building to perform their design accident mitigation functions.
"During investigations of flood barrier penetrations, a drain flow path from the CARP building into Room 23 of the Auxiliary Building [was identified]. There is no specific procedural guidance to isolate this flow path in the event of a flood above 1007 feet. Flooding through this flow path could have impacted the ability of the station's safety related equipment to perform their design accident mitigation functions.
"This eight-hour notification is being made pursuant to 10 CFR 50.72 (b)(3)(v)(D).
"The penetrations and CARP building drains are at an approximate elevation of 1007 feet. The river level has been less than 997 feet Mean Sea Level (MSL) since prior to December 1, 2010. The safety related equipment is currently operable. There are not any indications of conditions that might result in a flood. Compensatory actions have been identified."
"The NRC Resident Inspector has been notified."
Power Reactor
Event Number: 46742
Facility: FORT CALHOUN
Region: 4 State: NE
Unit: [1] [] []
RX Type: (1) CE
NRC Notified By: ERICK MATZKE
HQ OPS Officer: JOE O'HARA
Region: 4 State: NE
Unit: [1] [] []
RX Type: (1) CE
NRC Notified By: ERICK MATZKE
HQ OPS Officer: JOE O'HARA
Notification Date: 04/08/2011
Notification Time: 13:44 [ET]
Event Date: 04/08/2011
Event Time: 06:27 [CDT]
Last Update Date: 04/08/2011
Notification Time: 13:44 [ET]
Event Date: 04/08/2011
Event Time: 06:27 [CDT]
Last Update Date: 04/08/2011
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):
NEIL OKEEFE (R4DO)
NEIL OKEEFE (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 |
TECHNICAL SUPPORT CENTER INOPERABLE
"Technical Support Center (TSC) was non-functional due to inability to maintain pressure boundary for function of the TSC HVAC system. This morning the latch to one of the doors to the TSC was discovered broken. The door would not latch shut. The station has repaired the door. Compensatory measures were in place for the nonfunctional facility. The TSC is now functional."
The NRC Resident Inspector has been notified.
"Technical Support Center (TSC) was non-functional due to inability to maintain pressure boundary for function of the TSC HVAC system. This morning the latch to one of the doors to the TSC was discovered broken. The door would not latch shut. The station has repaired the door. Compensatory measures were in place for the nonfunctional facility. The TSC is now functional."
The NRC Resident Inspector has been notified.