Event Notification Report for November 21, 2021
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
11/20/2021 - 11/21/2021
EVENT NUMBERS
55597
55597
Power Reactor
Event Number: 55597
Facility: Calvert Cliffs
Region: 1 State: MD
Unit: [2] [] []
RX Type: [1] CE,[2] CE
NRC Notified By: Keith Swiger
HQ OPS Officer: Rodney Clagg
Region: 1 State: MD
Unit: [2] [] []
RX Type: [1] CE,[2] CE
NRC Notified By: Keith Swiger
HQ OPS Officer: Rodney Clagg
Notification Date: 11/21/2021
Notification Time: 14:28 [ET]
Event Date: 11/21/2021
Event Time: 10:46 [EST]
Last Update Date: 11/21/2021
Notification Time: 14:28 [ET]
Event Date: 11/21/2021
Event Time: 10:46 [EST]
Last Update Date: 11/21/2021
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS Actuation - Critical 50.72(b)(3)(iv)(A) - Valid Specif Sys Actuation
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS Actuation - Critical 50.72(b)(3)(iv)(A) - Valid Specif Sys Actuation
Person (Organization):
Deboer, Joseph (R1)
Deboer, Joseph (R1)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | M/R | Y | 100 | Power Operation | 0 | Hot Standby |
EN Revision Imported Date: 12/21/2021
EN Revision Text: MANUAL REACTOR TRIP AND AUTOMATIC AUXILIARY FEEDWATER ACTUATION
At 1046 EST on November 21, 2021, with Calvert Cliffs Nuclear Power Plant Unit 2 in Mode 1 at 100 percent power, the reactor was manually tripped due to lowering levels in both steam generators following a loss of the 21 and 22 steam generator feed pumps. An Auxiliary Feedwater System actuation occurred to restore steam generator water levels. The trip was not complicated, with all systems responding normally. Decay heat is being removed by the Auxiliary Feedwater System. Calvert Cliffs Nuclear Power Plant Unit 1 is unaffected and remains in Mode 1 at 100 percent power.
Due to the Reactor Protection System (RPS) actuation while critical, this event is being reported as a four-hour, non-emergency notification. RPS actuation, per 10 CFR 50.72(b)(2)(iv)(B). Additionally, the automatic actuation of the Auxiliary Feedwater System is being reported as an eight-hour, non-emergency notification, Specific System Actuation, per 10 CFR 50.72(b)(3)(vi)(A).
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: MANUAL REACTOR TRIP AND AUTOMATIC AUXILIARY FEEDWATER ACTUATION
At 1046 EST on November 21, 2021, with Calvert Cliffs Nuclear Power Plant Unit 2 in Mode 1 at 100 percent power, the reactor was manually tripped due to lowering levels in both steam generators following a loss of the 21 and 22 steam generator feed pumps. An Auxiliary Feedwater System actuation occurred to restore steam generator water levels. The trip was not complicated, with all systems responding normally. Decay heat is being removed by the Auxiliary Feedwater System. Calvert Cliffs Nuclear Power Plant Unit 1 is unaffected and remains in Mode 1 at 100 percent power.
Due to the Reactor Protection System (RPS) actuation while critical, this event is being reported as a four-hour, non-emergency notification. RPS actuation, per 10 CFR 50.72(b)(2)(iv)(B). Additionally, the automatic actuation of the Auxiliary Feedwater System is being reported as an eight-hour, non-emergency notification, Specific System Actuation, per 10 CFR 50.72(b)(3)(vi)(A).
There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified.