Event Notification Report for March 14, 2011
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
03/13/2011 - 03/14/2011
EVENT NUMBERS
46673
Power Reactor
Event Number: 46673
Facility: CRYSTAL RIVER
Region: 2 State: FL
Unit: [3] [] []
RX Type: [3] B&W-L-LP
NRC Notified By: WILLIAM KISNER
HQ OPS Officer: JOHN SHOEMAKER
Region: 2 State: FL
Unit: [3] [] []
RX Type: [3] B&W-L-LP
NRC Notified By: WILLIAM KISNER
HQ OPS Officer: JOHN SHOEMAKER
Notification Date: 03/15/2011
Notification Time: 15:16 [ET]
Event Date: 03/14/2011
Event Time: 13:11 [EST]
Last Update Date: 03/15/2011
Notification Time: 15:16 [ET]
Event Date: 03/14/2011
Event Time: 13:11 [EST]
Last Update Date: 03/15/2011
Emergency Class: NON EMERGENCY
10 CFR Section:
10 CFR Section:
Person (Organization):
REBECCA NEASE (R2DO)
REBECCA NEASE (R2DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 3 | N | N | 0 | Cold Shutdown | 0 | Cold Shutdown |
ADDITIONAL DELAMINATED CONTAINMENT CONCRETE DISCOVERED
"Crystal River Unit 3 is currently shutdown. Final tendon re-tensioning activities were being conducted following repair of delaminated (separated) concrete at the periphery of the containment wall. At approximately 1311 [EDT] on March 14, 2011, an indication was received from acoustic monitoring instrumentation located on the containment wall outside the previously repaired area. Re-tensioning activities were stopped and Plant Operations verified that there were no changes in plant parameters. Non-destructive examinations were initiated and preliminary indications are that there is delaminated concrete in the area identified by the acoustic monitoring. An assessment concluded that the containment continues to maintain the closure-pressure retaining capability required for Mode 5. There continues to be no threat to the public heath and safety.
"Delaminated concrete at the periphery of the containment wall was created in late 2009 during the process of creating an opening in the structure to remove and replace the steam generators inside (Reference Event Report 45416). The unit was already shut down for refueling and maintenance at the time the damage was found and has remained shut down."
The extent of newly discovered delaminated has not yet been determined.
The licensee plans to make a press release.
The licensee has notified the NRC Resident Inspector and the Florida Public Service Commission.
"Crystal River Unit 3 is currently shutdown. Final tendon re-tensioning activities were being conducted following repair of delaminated (separated) concrete at the periphery of the containment wall. At approximately 1311 [EDT] on March 14, 2011, an indication was received from acoustic monitoring instrumentation located on the containment wall outside the previously repaired area. Re-tensioning activities were stopped and Plant Operations verified that there were no changes in plant parameters. Non-destructive examinations were initiated and preliminary indications are that there is delaminated concrete in the area identified by the acoustic monitoring. An assessment concluded that the containment continues to maintain the closure-pressure retaining capability required for Mode 5. There continues to be no threat to the public heath and safety.
"Delaminated concrete at the periphery of the containment wall was created in late 2009 during the process of creating an opening in the structure to remove and replace the steam generators inside (Reference Event Report 45416). The unit was already shut down for refueling and maintenance at the time the damage was found and has remained shut down."
The extent of newly discovered delaminated has not yet been determined.
The licensee plans to make a press release.
The licensee has notified the NRC Resident Inspector and the Florida Public Service Commission.