Event Notification Report for October 11, 2020
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
10/10/2020 - 10/11/2020
EVENT NUMBERS
54943
Power Reactor
Event Number: 54943
Facility: Catawba
Region: 2 State: SC
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Stan Sinclair
HQ OPS Officer: Brian Lin
Region: 2 State: SC
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Stan Sinclair
HQ OPS Officer: Brian Lin
Notification Date: 10/11/2020
Notification Time: 10:25 [ET]
Event Date: 10/11/2020
Event Time: 03:15 [EDT]
Last Update Date: 10/11/2020
Notification Time: 10:25 [ET]
Event Date: 10/11/2020
Event Time: 03:15 [EDT]
Last Update Date: 10/11/2020
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):
MARK MILLER (R2DO)
MARK MILLER (R2DO)
| 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 | 100 | Power Operation | 100 | Power Operation |
LONG TERM HABITABILITY OF THE TECHNICAL SUPPORT CENTER UNDER ACCIDENT DOSE ANALYSIS EXCEEDS THE CALCULATED ALLOWABLE VALUES
"At 0315 [EDT] on October 11, 2020, Unit 2 ECCS [Emergency Core Cooling System] leakage outside containment was determined to exceed the long term habitability dose analysis for the Catawba Nuclear Station Technical Support Center (TSC) under bounding conditions. At the current leakage (approximately 3.2 gpm), the dose analysis indicates dose to TSC inhabitants would exceed the 30 days REM TEDE [Total Effective Dose Equivalent] limit should leakage continue for the entire duration. Repairs are currently in-progress to arrest the leakage and restore functionality of the TSC.
"If an emergency is declared requiring TSC activation during this period, the TSC will be staffed and activated using existing emergency planning procedures unless the TSC becomes uninhabitable. If relocation of the TSC becomes necessary, the Emergency Director will relocate the TSC staff to the alternate facility.
"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 discovered condition of the TSC affects the functionality of an emergency response facility,
"There is no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified."
"At 0315 [EDT] on October 11, 2020, Unit 2 ECCS [Emergency Core Cooling System] leakage outside containment was determined to exceed the long term habitability dose analysis for the Catawba Nuclear Station Technical Support Center (TSC) under bounding conditions. At the current leakage (approximately 3.2 gpm), the dose analysis indicates dose to TSC inhabitants would exceed the 30 days REM TEDE [Total Effective Dose Equivalent] limit should leakage continue for the entire duration. Repairs are currently in-progress to arrest the leakage and restore functionality of the TSC.
"If an emergency is declared requiring TSC activation during this period, the TSC will be staffed and activated using existing emergency planning procedures unless the TSC becomes uninhabitable. If relocation of the TSC becomes necessary, the Emergency Director will relocate the TSC staff to the alternate facility.
"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 discovered condition of the TSC affects the functionality of an emergency response facility,
"There is no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified."