Event Notification Report for April 13, 2020
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
04/12/2020 - 04/13/2020
EVENT NUMBERS
54663
Power Reactor
Event Number: 54663
Facility: MILLSTONE
Region: 1 State: CT
Unit: [] [] [3]
RX Type: [1] GE-3,[2] CE,[3] W-4-LP
NRC Notified By: JASON PARIS
HQ OPS Officer: OSSY FONT
Region: 1 State: CT
Unit: [] [] [3]
RX Type: [1] GE-3,[2] CE,[3] W-4-LP
NRC Notified By: JASON PARIS
HQ OPS Officer: OSSY FONT
Notification Date: 04/13/2020
Notification Time: 19:33 [ET]
Event Date: 04/13/2020
Event Time: 15:50 [EDT]
Last Update Date: 04/13/2020
Notification Time: 19:33 [ET]
Event Date: 04/13/2020
Event Time: 15:50 [EDT]
Last Update Date: 04/13/2020
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):
DONNA JANDA (R1DO)
DONNA JANDA (R1DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 3 | A/R | Y | 82 | Power Operation | 0 | Hot Standby |
AUTOMATIC TRIP DUE TO LOW CONDENSER VACUUM
"At 1550 EDT on 4/13/2020, with Millstone Power Station Unit 3 operating at approximately 82 percent reactor power, an automatic reactor trip occurred following a turbine trip due to low condenser vacuum caused by the trip of multiple circulating water pumps. Due to the loss of the circulating water pumps, decay heat removal was established by the steam generator atmospheric dump valves. All other systems responded as expected to the trip.
"Auxiliary feedwater actuated automatically as expected following the trip due to low-low levels in the steam generators.
"There was no risk to the public. There was no impact to Millstone Unit 2.
"The Senior Resident Inspector has been informed.
"This event is being reported as a four hour report under 10 CFR 50.72(b)(2)(iv)(B) as a condition that resulted in actuation of the reactor protection system while the reactor was critical, and as an eight hour report under 10 CFR 50.72(b)(3)(iv)(A) and 10 CFR 50.72(b)(3)(iv)(B) for actuation of the auxiliary feedwater system."
The licensee also notified the state of Connecticut, the Connecticut Department of Energy and Environmental Protection, and the city of Waterford.
"At 1550 EDT on 4/13/2020, with Millstone Power Station Unit 3 operating at approximately 82 percent reactor power, an automatic reactor trip occurred following a turbine trip due to low condenser vacuum caused by the trip of multiple circulating water pumps. Due to the loss of the circulating water pumps, decay heat removal was established by the steam generator atmospheric dump valves. All other systems responded as expected to the trip.
"Auxiliary feedwater actuated automatically as expected following the trip due to low-low levels in the steam generators.
"There was no risk to the public. There was no impact to Millstone Unit 2.
"The Senior Resident Inspector has been informed.
"This event is being reported as a four hour report under 10 CFR 50.72(b)(2)(iv)(B) as a condition that resulted in actuation of the reactor protection system while the reactor was critical, and as an eight hour report under 10 CFR 50.72(b)(3)(iv)(A) and 10 CFR 50.72(b)(3)(iv)(B) for actuation of the auxiliary feedwater system."
The licensee also notified the state of Connecticut, the Connecticut Department of Energy and Environmental Protection, and the city of Waterford.