Event Notification Report for August 03, 2021
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
08/02/2021 - 08/03/2021
Power Reactor
Event Number: 55394
Facility: Hatch
Region: 2 State: GA
Unit: [1] [] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: Nick Hightower
HQ OPS Officer: Thomas Kendzia
Region: 2 State: GA
Unit: [1] [] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: Nick Hightower
HQ OPS Officer: Thomas Kendzia
Notification Date: 08/03/2021
Notification Time: 13:18 [ET]
Event Date: 08/03/2021
Event Time: 10:26 [EDT]
Last Update Date: 08/03/2021
Notification Time: 13:18 [ET]
Event Date: 08/03/2021
Event Time: 10:26 [EDT]
Last Update Date: 08/03/2021
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):
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 | 100 | Power Operation | 0 | Hot Standby |
EN Revision Imported Date: 9/3/2021
EN Revision Text: AUTOMATIC REACTOR TRIP
"At 1026 EDT on 8/3/21, with Unit 1 in MODE 1 at 100 percent power, the reactor automatically tripped due to low reactor water level. The low reactor water level condition was due to a loss of both reactor feed pumps. The cause of the loss of feed pumps is under investigation. Additionally, the low reactor water level resulted in the automatic actuation of High Pressure Coolant Injection (HPCI) and Reactor Core Isolation Cooling (RCIC) systems, and Containment Isolation Valves (CIVs) in multiple systems. All safety systems responded normally.
"Operations responded and stabilized the plant. Reactor water level is being maintained via RCIC system. Decay heat is being removed by discharging steam to the main condenser using the turbine bypass valves. Unit 2 is not affected.
"Due to the 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). It is also reportable under 10 CFR 50.72(b)(3)(iv)(A) as an event that results in a valid actuation of the HPCI and RCIC systems and CIVs. There was no impact on the health and safety of the public or plant."
The Licensee notified the NRC Resident Inspector. The Unit will proceed to Mode 4 while the cause of the loss of feed pumps is under investigation.
EN Revision Text: AUTOMATIC REACTOR TRIP
"At 1026 EDT on 8/3/21, with Unit 1 in MODE 1 at 100 percent power, the reactor automatically tripped due to low reactor water level. The low reactor water level condition was due to a loss of both reactor feed pumps. The cause of the loss of feed pumps is under investigation. Additionally, the low reactor water level resulted in the automatic actuation of High Pressure Coolant Injection (HPCI) and Reactor Core Isolation Cooling (RCIC) systems, and Containment Isolation Valves (CIVs) in multiple systems. All safety systems responded normally.
"Operations responded and stabilized the plant. Reactor water level is being maintained via RCIC system. Decay heat is being removed by discharging steam to the main condenser using the turbine bypass valves. Unit 2 is not affected.
"Due to the 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). It is also reportable under 10 CFR 50.72(b)(3)(iv)(A) as an event that results in a valid actuation of the HPCI and RCIC systems and CIVs. There was no impact on the health and safety of the public or plant."
The Licensee notified the NRC Resident Inspector. The Unit will proceed to Mode 4 while the cause of the loss of feed pumps is under investigation.
Power Reactor
Event Number: 55395
Facility: Braidwood
Region: 3 State: IL
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Zachary Myers
HQ OPS Officer: Kerby Scales
Region: 3 State: IL
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Zachary Myers
HQ OPS Officer: Kerby Scales
Notification Date: 08/03/2021
Notification Time: 19:35 [ET]
Event Date: 08/03/2021
Event Time: 15:39 [CDT]
Last Update Date: 08/03/2021
Notification Time: 19:35 [ET]
Event Date: 08/03/2021
Event Time: 15:39 [CDT]
Last Update Date: 08/03/2021
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(2)(xi) - Offsite Notification
10 CFR Section:
50.72(b)(2)(xi) - Offsite Notification
Person (Organization):
KOZAK, LAURA (R3)
KOZAK, LAURA (R3)
| 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 |
EN Revision Imported Date: 9/3/2021
EN Revision Text: OFFSITE NOTIFICATION - INADVERTENT SIREN ACTUATION
"At approximately 1539 CDT on 8/3/2021, the Braidwood Station Main Control Room was notified of the inadvertent actuation of 17 Full Sounding sirens affecting Braidwood Station in Will County Illinois while testing other sirens. Will County EMA inadvertently actuated the sirens on 08/03/2021 at 1440 CDT.
"This event is reportable per 10CFR50.72(b)(2)(xi), News release or Notification of Other Government Agencies. This is a 4 Hour Reporting requirement.
"The Braidwood NRC Resident has been notified."
See related Event Notification #55396.
EN Revision Text: OFFSITE NOTIFICATION - INADVERTENT SIREN ACTUATION
"At approximately 1539 CDT on 8/3/2021, the Braidwood Station Main Control Room was notified of the inadvertent actuation of 17 Full Sounding sirens affecting Braidwood Station in Will County Illinois while testing other sirens. Will County EMA inadvertently actuated the sirens on 08/03/2021 at 1440 CDT.
"This event is reportable per 10CFR50.72(b)(2)(xi), News release or Notification of Other Government Agencies. This is a 4 Hour Reporting requirement.
"The Braidwood NRC Resident has been notified."
See related Event Notification #55396.
Power Reactor
Event Number: 55396
Facility: Dresden
Region: 3 State: IL
Unit: [2] [3] []
RX Type: [2] GE-3,[3] GE-3
NRC Notified By: Mark Schimanski
HQ OPS Officer: Thomas Kendzia
Region: 3 State: IL
Unit: [2] [3] []
RX Type: [2] GE-3,[3] GE-3
NRC Notified By: Mark Schimanski
HQ OPS Officer: Thomas Kendzia
Notification Date: 08/03/2021
Notification Time: 19:48 [ET]
Event Date: 08/03/2021
Event Time: 15:39 [CDT]
Last Update Date: 08/03/2021
Notification Time: 19:48 [ET]
Event Date: 08/03/2021
Event Time: 15:39 [CDT]
Last Update Date: 08/03/2021
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(2)(xi) - Offsite Notification
10 CFR Section:
50.72(b)(2)(xi) - Offsite Notification
Person (Organization):
LAURA KOZAK (R3DO)
LAURA KOZAK (R3DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
| 3 | N | Y | 100 | Power Operation | 100 | Power Operation |
EN Revision Imported Date: 9/2/2021
EN Revision Text: OFFSITE NOTIFICATION - INADVERTENT SIREN ACTUATION
"At approximately 1539 CDT on 8/3/2021, the Dresden Station Main Control was notified of the inadvertent actuation of 17 full sounding emergency response sirens affected Dresden Station in Will County Illinois, while testing other sirens. Will County EMA inadvertently actuated the sirens on 8/3/2021 at 1440 CDT.
"This event is reportable per 10 CFR 50.72(b )(2)(xi), News Release or Notification of Other Government Agencies. This is a 4-Hour Reporting requirement.
"The Dresden NRC Resident has been notified."
See related Event Notification #55395.
EN Revision Text: OFFSITE NOTIFICATION - INADVERTENT SIREN ACTUATION
"At approximately 1539 CDT on 8/3/2021, the Dresden Station Main Control was notified of the inadvertent actuation of 17 full sounding emergency response sirens affected Dresden Station in Will County Illinois, while testing other sirens. Will County EMA inadvertently actuated the sirens on 8/3/2021 at 1440 CDT.
"This event is reportable per 10 CFR 50.72(b )(2)(xi), News Release or Notification of Other Government Agencies. This is a 4-Hour Reporting requirement.
"The Dresden NRC Resident has been notified."
See related Event Notification #55395.