Event Notification Report for July 04, 2021
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
07/03/2021 - 07/04/2021
EVENT NUMBERS
55339
55339
Power Reactor
Event Number: 55339
Facility: Catawba
Region: 2 State: SC
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Walter Hunnicutt
HQ OPS Officer: Jeffrey Whited
Region: 2 State: SC
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Walter Hunnicutt
HQ OPS Officer: Jeffrey Whited
Notification Date: 07/04/2021
Notification Time: 15:59 [ET]
Event Date: 07/04/2021
Event Time: 09:11 [EDT]
Last Update Date: 07/04/2021
Notification Time: 15:59 [ET]
Event Date: 07/04/2021
Event Time: 09:11 [EDT]
Last Update Date: 07/04/2021
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):
MILLER, MARK (R2)
MILLER, MARK (R2)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
| 2 | N | Y | 99 | Power Operation | 99 | Power Operation |
EN Revision Imported Date: 8/4/2021
EN Revision Text: LOSS OF SEISMIC MONITORING FOR EMERGENCY PLAN ASSESSMENT
"At 0911 EDT on July 4, 2021, a failure occurred on 2 out of 3 of the required seismic monitoring instruments that feed the Operational Basis Earthquake (OBE) annunciator. The failure would prevent an OBE EXCEEDED alarm on the Seismic Monitoring Panel in the Control Room. This results in a major loss of emergency assessment capability. Corrective actions are being pursued to restore the seismic monitoring instruments. Compensatory measures are in place to assure adequate monitoring capability.
"This is an eight-hour, non-emergency notification for a loss of Emergency Assessment Capability. This event is reportable in accordance with 10 CFR 50.72(b)(3)(xiii) because the unplanned failure of the required seismic instruments affects the ability to assess a seismic event greater than the OBE. There was no impact on the health and safety of the public or plant personnel.
"The NRC Resident Inspector has been notified."
EN Revision Text: LOSS OF SEISMIC MONITORING FOR EMERGENCY PLAN ASSESSMENT
"At 0911 EDT on July 4, 2021, a failure occurred on 2 out of 3 of the required seismic monitoring instruments that feed the Operational Basis Earthquake (OBE) annunciator. The failure would prevent an OBE EXCEEDED alarm on the Seismic Monitoring Panel in the Control Room. This results in a major loss of emergency assessment capability. Corrective actions are being pursued to restore the seismic monitoring instruments. Compensatory measures are in place to assure adequate monitoring capability.
"This is an eight-hour, non-emergency notification for a loss of Emergency Assessment Capability. This event is reportable in accordance with 10 CFR 50.72(b)(3)(xiii) because the unplanned failure of the required seismic instruments affects the ability to assess a seismic event greater than the OBE. There was no impact on the health and safety of the public or plant personnel.
"The NRC Resident Inspector has been notified."