Event Notification Report for January 28, 2026
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Event Text
Event Text
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
01/27/2026 - 01/28/2026
Power Reactor
Event Number: 58129
Facility: Comanche Peak
Region: 4 State: TX
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Bryan Burke
HQ OPS Officer: Kerby Scales
Region: 4 State: TX
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Bryan Burke
HQ OPS Officer: Kerby Scales
Notification Date: 01/26/2026
Notification Time: 19:46 [ET]
Event Date: 01/26/2026
Event Time: 18:23 [CST]
Last Update Date: 01/26/2026
Notification Time: 19:46 [ET]
Event Date: 01/26/2026
Event Time: 18:23 [CST]
Last Update Date: 01/26/2026
Emergency Class: Unusual Event
10 CFR Section:
50.72(a) (1) (i) - Emergency Declared
10 CFR Section:
50.72(a) (1) (i) - Emergency Declared
Person (Organization):
Dixon, John (R4DO)
Williams, Kevin (NSIR)
Monninger, John (R4 RA)
Groom, Jeremy (NRR)
Grant, Jeffery (IR)
Dixon, John (R4DO)
Williams, Kevin (NSIR)
Monninger, John (R4 RA)
Groom, Jeremy (NRR)
Grant, Jeffery (IR)
| 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: 1/27/2026
EN Revision Text: UNUSUAL EVENT - SECURITY THREAT
The following information was provided by the licensee via phone:
On January 26, 2026, at 1823 CST, a Notice of Unusual Event was declared on emergency action level HU1.1 due to a security event.
The NRC Resident Inspector, the State of Texas, and local authorities have been notified.
Notified DHS SWO, FEMA Operations Center, FEMA NWC, CISA Central Watch Officer, CWMD Watch Desk, DHS Nuclear SSA (email), DHS NRCC THD Desk (email).
* * * UPDATE ON 01/26/2026 AT 2058 EST FROM MATT MAGER TO KERBY SCALES * * *
The following information provided by the licensee via phone:
On January 26, 2026, at 1940 CST, the Unusual Event was terminated.
The NRC Resident Inspector was notified.
Notified R4RA (Monninger), NRR (Groom), NSIR (Williams), R4DO (Dixon), NRR EO (Mckenna), IR MOC (Grant), R4PAO (Smith).
Notified DHS SWO, FEMA Operations Center, FEMA NWC, CISA Central Watch Officer, CWMD Watch Desk, DHS Nuclear SSA (email), DHS NRCC THD Desk (email).
EN Revision Text: UNUSUAL EVENT - SECURITY THREAT
The following information was provided by the licensee via phone:
On January 26, 2026, at 1823 CST, a Notice of Unusual Event was declared on emergency action level HU1.1 due to a security event.
The NRC Resident Inspector, the State of Texas, and local authorities have been notified.
Notified DHS SWO, FEMA Operations Center, FEMA NWC, CISA Central Watch Officer, CWMD Watch Desk, DHS Nuclear SSA (email), DHS NRCC THD Desk (email).
* * * UPDATE ON 01/26/2026 AT 2058 EST FROM MATT MAGER TO KERBY SCALES * * *
The following information provided by the licensee via phone:
On January 26, 2026, at 1940 CST, the Unusual Event was terminated.
The NRC Resident Inspector was notified.
Notified R4RA (Monninger), NRR (Groom), NSIR (Williams), R4DO (Dixon), NRR EO (Mckenna), IR MOC (Grant), R4PAO (Smith).
Notified DHS SWO, FEMA Operations Center, FEMA NWC, CISA Central Watch Officer, CWMD Watch Desk, DHS Nuclear SSA (email), DHS NRCC THD Desk (email).
Agreement State
Event Number: 58125
Rep Org: California Radiation Control Prgm
Licensee: Cedars Sinai Medical Center
Region: 4
City: Los Angeles State: CA
County:
License #: 0404-19
Agreement: Y
Docket:
NRC Notified By: Jeff Day
HQ OPS Officer: Karen Cotton
Licensee: Cedars Sinai Medical Center
Region: 4
City: Los Angeles State: CA
County:
License #: 0404-19
Agreement: Y
Docket:
NRC Notified By: Jeff Day
HQ OPS Officer: Karen Cotton
Notification Date: 01/21/2026
Notification Time: 18:27 [ET]
Event Date: 01/20/2026
Event Time: 18:41 [PST]
Last Update Date: 01/21/2026
Notification Time: 18:27 [ET]
Event Date: 01/20/2026
Event Time: 18:41 [PST]
Last Update Date: 01/21/2026
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
10 CFR Section:
Agreement State
Person (Organization):
Drake, James (R4DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
Drake, James (R4DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
AGREEMENT STATE REPORT - MEDICAL EVENT
The following information was provided by the California Radiation Control Program, Radiologic Health Branch (RHB), via email:
"On January 20, 2026, at approximately 1841 PST, the radiation safety officer and Associate Director of Environmental Health & Safety at Cedars Sinai Medical Center contacted RHB to report a medical event that occurred earlier that same day. The event involved an underdose to a patient during a radioembolization treatment for liver cancer using yttrium-90 (Y-90) TheraSphere microspheres. The prescribed activity was 3.01 GBq. Approximately 88.5 percent of the activity remained as residual activity [in the administration kit] due to a kink in the microcatheter used for delivery of the Y-90 microspheres.
"Cedars Sinai Medical Center will investigate to gain a better understanding of the details of the event. RHB will also investigate the medical event, to include the licensee's investigation results."
California 5010 number: 012026
A Medical Event may indicate potential problems in a medical facility's use of radioactive materials. It does not necessarily result in harm to the patient.
The following information was provided by the California Radiation Control Program, Radiologic Health Branch (RHB), via email:
"On January 20, 2026, at approximately 1841 PST, the radiation safety officer and Associate Director of Environmental Health & Safety at Cedars Sinai Medical Center contacted RHB to report a medical event that occurred earlier that same day. The event involved an underdose to a patient during a radioembolization treatment for liver cancer using yttrium-90 (Y-90) TheraSphere microspheres. The prescribed activity was 3.01 GBq. Approximately 88.5 percent of the activity remained as residual activity [in the administration kit] due to a kink in the microcatheter used for delivery of the Y-90 microspheres.
"Cedars Sinai Medical Center will investigate to gain a better understanding of the details of the event. RHB will also investigate the medical event, to include the licensee's investigation results."
California 5010 number: 012026
A Medical Event may indicate potential problems in a medical facility's use of radioactive materials. It does not necessarily result in harm to the patient.
Page Last Reviewed/Updated January 28, 2026, 10:02 am