Event Notification Report for September 03, 2020
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
09/02/2020 - 09/03/2020
Power Reactor
Event Number: 54880
Facility: River Bend
Region: 4 State: LA
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: Jason Arms
HQ OPS Officer: Bethany Cecere
Region: 4 State: LA
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: Jason Arms
HQ OPS Officer: Bethany Cecere
Notification Date: 09/04/2020
Notification Time: 01:40 [ET]
Event Date: 09/03/2020
Event Time: 20:48 [CDT]
Last Update Date: 09/04/2020
Notification Time: 01:40 [ET]
Event Date: 09/03/2020
Event Time: 20:48 [CDT]
Last Update Date: 09/04/2020
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):
RICK DEESE (R4DO)
RICK DEESE (R4DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 92 | Power Operation | 92 | Power Operation |
HIGH PRESSURE CORE SPRAY INOPERABLE
"River Bend Station experienced an inadvertent initiation and injection of High Pressure Core Spray (HPCS) at 2048 [CDT] on 9/3/2020 while operating at 92% power. Initial investigation indicates a power supply failure in the Division III trip units which feeds HPCS and Division III Diesel Initiation signals.
"The Control Room Operator responded to the event by taking manual control of Feedwater Level Control to maintain Reactor Water Level nominal values. The HPCS injection valve was open for approximately 25 seconds before operators manually closed the valve.
"The manual closure of the injection isolation valve caused the system to be incapable of responding to an automatic actuation signal. The manual override of the injection isolation valve was reset approximately 52 minutes after the event. The HPCS system has remained inoperable. The event is being reported in accordance with 10 CFR 50.72(b)(3)(v)(D) as a condition that caused loss of function of the HPCS System.
"No radiological releases have occurred due to this event.
"The Senior NRC Resident Inspector has been notified."
These conditions put the unit in a 14-day LCO (3.5.1) for HPCS Inoperability and a 30-day LCO (3.7.1) for one Standby Service Water Pump Inoperable (2C).
"River Bend Station experienced an inadvertent initiation and injection of High Pressure Core Spray (HPCS) at 2048 [CDT] on 9/3/2020 while operating at 92% power. Initial investigation indicates a power supply failure in the Division III trip units which feeds HPCS and Division III Diesel Initiation signals.
"The Control Room Operator responded to the event by taking manual control of Feedwater Level Control to maintain Reactor Water Level nominal values. The HPCS injection valve was open for approximately 25 seconds before operators manually closed the valve.
"The manual closure of the injection isolation valve caused the system to be incapable of responding to an automatic actuation signal. The manual override of the injection isolation valve was reset approximately 52 minutes after the event. The HPCS system has remained inoperable. The event is being reported in accordance with 10 CFR 50.72(b)(3)(v)(D) as a condition that caused loss of function of the HPCS System.
"No radiological releases have occurred due to this event.
"The Senior NRC Resident Inspector has been notified."
These conditions put the unit in a 14-day LCO (3.5.1) for HPCS Inoperability and a 30-day LCO (3.7.1) for one Standby Service Water Pump Inoperable (2C).
Agreement State
Event Number: 54884
Rep Org: CALIFORNIA RADIATION CONTROL PRGM
Licensee: Sterigenics US, LLC
Region: 4
City: Tustin State: CA
County:
License #: 3390
Agreement: Y
Docket:
NRC Notified By: Robert Greger
HQ OPS Officer: Jeffrey Whited
Licensee: Sterigenics US, LLC
Region: 4
City: Tustin State: CA
County:
License #: 3390
Agreement: Y
Docket:
NRC Notified By: Robert Greger
HQ OPS Officer: Jeffrey Whited
Notification Date: 09/04/2020
Notification Time: 20:51 [ET]
Event Date: 09/03/2020
Event Time: 00:00 [PDT]
Last Update Date: 09/04/2020
Notification Time: 20:51 [ET]
Event Date: 09/03/2020
Event Time: 00:00 [PDT]
Last Update Date: 09/04/2020
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
10 CFR Section:
Agreement State
Person (Organization):
RICK DEESE (R4DO)
JEFFERY GRANT (IRD)
NMSS_EVENTS_NOTIFICATION (EMAIL)
RICK DEESE (R4DO)
JEFFERY GRANT (IRD)
NMSS_EVENTS_NOTIFICATION (EMAIL)
AGREEMENT STATE REPORT - POOL WATER CONDUCTIVITY EXCEEDED LIMITS
The following was received from the State of California Department of Public Health - Radiologic Health Branch (CDPH/RHB) via email:
"The licensee Radiation Safety Officer reported that the pool water conductivity exceeded 100 microSiemens/cm on 9/3/20. The reason was the loss of operability of the demineralizer pump. The pump has been repaired and is currently operable with declining pool water conductivity, but the pool water is still in excess of 100 microSiemens/cm. CDPH/RHB is continuing to investigate the circumstances surrounding this event."
The following was received from the State of California Department of Public Health - Radiologic Health Branch (CDPH/RHB) via email:
"The licensee Radiation Safety Officer reported that the pool water conductivity exceeded 100 microSiemens/cm on 9/3/20. The reason was the loss of operability of the demineralizer pump. The pump has been repaired and is currently operable with declining pool water conductivity, but the pool water is still in excess of 100 microSiemens/cm. CDPH/RHB is continuing to investigate the circumstances surrounding this event."
Power Reactor
Event Number: 54877
Facility: Prairie Island
Region: 3 State: MN
Unit: [1] [2] []
RX Type: [1] W-2-LP,[2] W-2-LP
NRC Notified By: Raymond York
HQ OPS Officer: Thomas Herrity
Region: 3 State: MN
Unit: [1] [2] []
RX Type: [1] W-2-LP,[2] W-2-LP
NRC Notified By: Raymond York
HQ OPS Officer: Thomas Herrity
Notification Date: 09/03/2020
Notification Time: 15:36 [ET]
Event Date: 09/03/2020
Event Time: 14:21 [CDT]
Last Update Date: 09/03/2020
Notification Time: 15:36 [ET]
Event Date: 09/03/2020
Event Time: 14:21 [CDT]
Last Update Date: 09/03/2020
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):
DAVID HILLS (R3DO)
DAVID HILLS (R3DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 95 | Power Operation | 95 | Power Operation |
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
OFFSITE NOTIFICATION DUE TO A HYDRAULIC OIL SPILL
"On 9/3/2020, at 1421 (CDT), a notification was made to the National Response Center as a result of a spill of approximately 3 fluid ounces of hydraulic oil into the plant waters of Prairie Island Nuclear Plant intake on 9/2/2020.
"This notification is being made as a four-hour, non-emergency notification for a Notification of Other Government Agency. This event is reportable in accordance with 10 CFR 50.72(b)(2)(xi).
"There was no impact to public health and safety.
"The NRC resident inspector has been notified."
"On 9/3/2020, at 1421 (CDT), a notification was made to the National Response Center as a result of a spill of approximately 3 fluid ounces of hydraulic oil into the plant waters of Prairie Island Nuclear Plant intake on 9/2/2020.
"This notification is being made as a four-hour, non-emergency notification for a Notification of Other Government Agency. This event is reportable in accordance with 10 CFR 50.72(b)(2)(xi).
"There was no impact to public health and safety.
"The NRC resident inspector has been notified."