Event Notification Report for December 16, 2020
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
12/15/2020 - 12/16/2020
Power Reactor
Event Number: 55040
Facility: Harris
Region: 2 State: NC
Unit: [1] [] []
RX Type: [1] W-3-LP
NRC Notified By: Paul Houseworth
HQ OPS Officer: Howie Crouch
Region: 2 State: NC
Unit: [1] [] []
RX Type: [1] W-3-LP
NRC Notified By: Paul Houseworth
HQ OPS Officer: Howie Crouch
Notification Date: 12/17/2020
Notification Time: 22:03 [ET]
Event Date: 12/17/2020
Event Time: 15:39 [EST]
Last Update Date: 12/17/2020
Notification Time: 22:03 [ET]
Event Date: 12/17/2020
Event Time: 15:39 [EST]
Last Update Date: 12/17/2020
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(3)(v)(D) - Accident Mitigation
10 CFR Section:
50.72(b)(3)(v)(D) - Accident Mitigation
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 | N | 0 | Power Operation | 0 | Power Operation |
ACCUMULATOR DISCHARGE VALVES ISOLATED WITH PLANT GREATER THAN 1000 PSIG
"On December 17, 2020 at 1539 EST, with Harris Nuclear Plant Unit 1 preparing for entry into Mode 4, the Reactor Coolant System was pressurized greater than 1000 psig for approximately 15 minutes with all three Cold Leg Injection Accumulator Discharge Valves closed. This event is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v)(D). Both Low Head and High Head Safety Injection Systems were operable at this time.
"This condition does not affect the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified."
"On December 17, 2020 at 1539 EST, with Harris Nuclear Plant Unit 1 preparing for entry into Mode 4, the Reactor Coolant System was pressurized greater than 1000 psig for approximately 15 minutes with all three Cold Leg Injection Accumulator Discharge Valves closed. This event is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v)(D). Both Low Head and High Head Safety Injection Systems were operable at this time.
"This condition does not affect the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified."
Power Reactor
Event Number: 55038
Facility: Harris
Region: 2 State: NC
Unit: [1] [] []
RX Type: [1] W-3-LP
NRC Notified By: Chris Hayes
HQ OPS Officer: Howie Crouch
Region: 2 State: NC
Unit: [1] [] []
RX Type: [1] W-3-LP
NRC Notified By: Chris Hayes
HQ OPS Officer: Howie Crouch
Notification Date: 12/16/2020
Notification Time: 12:19 [ET]
Event Date: 12/16/2020
Event Time: 08:51 [EST]
Last Update Date: 12/16/2020
Notification Time: 12:19 [ET]
Event Date: 12/16/2020
Event Time: 08:51 [EST]
Last Update Date: 12/16/2020
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS Actuation - Critical
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS Actuation - Critical
Person (Organization):
MILLER, MARK (R2)
MILLER, MARK (R2)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | A/R | Y | 80 | Power Operation | 0 | Hot Standby |
AUTOMATIC REACTOR TRIP DUE TO GENERATOR LOCKOUT
"On December 16, 2020 at 0851 EST, with Harris Nuclear Plant Unit 1 in Mode 1 at 80 percent power, an automatic reactor trip occurred due to lockout of the main generator. The trip was not complex, with all systems responding normally post-trip. The initial assessment of this event indicates that there was a ground fault on the 'B' train of the non-safety electrical distribution system that caused the main generator lockout. Steam generator levels are being maintained by normal feedwater through the feedwater regulator bypass valves. Decay heat is being removed by using the condenser steam dump flow path.
"Due to the unplanned Reactor Protection System actuation while critical, this event is being reported as a four hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B).
"This condition does not affect the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified."
All rods inserted into the core during the trip. The electrical grid is stable and all safe shutdown equipment is available for service. No reliefs lifted during the transient.
"On December 16, 2020 at 0851 EST, with Harris Nuclear Plant Unit 1 in Mode 1 at 80 percent power, an automatic reactor trip occurred due to lockout of the main generator. The trip was not complex, with all systems responding normally post-trip. The initial assessment of this event indicates that there was a ground fault on the 'B' train of the non-safety electrical distribution system that caused the main generator lockout. Steam generator levels are being maintained by normal feedwater through the feedwater regulator bypass valves. Decay heat is being removed by using the condenser steam dump flow path.
"Due to the unplanned Reactor Protection System actuation while critical, this event is being reported as a four hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B).
"This condition does not affect the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified."
All rods inserted into the core during the trip. The electrical grid is stable and all safe shutdown equipment is available for service. No reliefs lifted during the transient.