Event Notification Report for January 20, 2026

AGREEMENT STATE REPORT - MEDICAL EVENT

The following information was provided by the Illinois Emergency Management Agency (the Agency) via phone and email:

"The Agency was contacted on January 9, 2026, by radiation safety staff at Northwestern Memorial Hospital to report that a patient prescribed 21.1 mCi (0.7807 GBq) of Y-90 TheraSpheres on that date received approximately 36 percent of the prescribed dose. A previously administered dose to the same patient was delivered without incident. The patient and referring physician were notified, and there was no reported adverse impact to the patient. The investigation is ongoing, and a reactive inspection will be conducted next week to review procedures and identify the possible root cause. This event meets the criteria for a reportable event under 32 Ill. Adm. Code 335.1080 and was reported to the NRC on January 9, 2026."

Illinois item number: IL260001

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.

AGREEMENT STATE REPORT - GAS CHROMATOGRAPH CONTAMINATED

The following information was provided by the Vermont Department of Health (VDH) via email:

"The Vermont Department of Health laboratory conducted a leak test of an electron capture detector (ECD) number U27936 on June 28, 2023. Results from the swipe test of the inlet to the detector were calculated on June 29, 2023, and showed 2.3E-2 microcuries of removable Ni-63 contamination. The gas chromatograph was immediately placed out-of-service and the gas flow was terminated.

"The ECD detector contained 13.2 millicuries Ni-63 total activity.

"A Thermo Scientific RadEye B20-ER survey meter (calibrated November 15, 2022) was used to assess the level of risk, and there was no measurable radiation above background, including with the column oven door open.

"The VDH received notification of the incident June 29, 2023.

"The area around the ECD detector was re-surveyed for removable contamination on June 29, 2023, including the inlet, which showed 5.1E-5 microcuries (50 picocuries) of contamination. Results of the second swipe surveys were calculated on June 30, 2023, and all other swipes were 5 picocuries or less. The area was decontaminated, and the source was removed, capped, bagged, boxed, and stored securely on June 30, 2023.

"Agilent's repair facility requested the source be returned for an assessment to Agilent's repair facility."

VDH incident number: 23-002

The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:

The event was entered into NMED in 2023 but was not reported to the Headquarters Operations Center until now.

AUTOMATIC REACTOR TRIP

The following information was provided by the licensee via phone and email:

"At 0320 EST on January 18, 2026, DC Cook Unit 2 tripped automatically following receipt of reactor control instrumentation control group 1 and controller failure annunciators.

"The reason for the annunciators remains under investigation.

"This notification is being made in accordance with 10 CFR 50.72(b)(2)(iv)(B), reactor protection system actuation as a four-hour report, and under 10 CFR 50.72(b)(3)(iv)(A), specified system actuation of the auxiliary feedwater system, as an eight-hour report. The DC Cook Resident NRC Inspector has been notified. Unit 2 is being supplied by offsite power. All control rods fully inserted. All auxiliary feedwater pumps started properly. Decay heat is being removed via the steam dump system. Preliminary evaluation indicates equipment required for post trip response functioned normally following the reactor trip.

"DC Cook Unit 2 remains stable in Mode 3 while conducting the post trip review. No radioactive release is in progress as a result of this event. Unit 1 remains stable at 100 percent power and is unaffected."

HIGH PRESSURE COOLANT INJECTION INOPERABLE

The following information was provided by the licensee via phone and email:

"At 1445 CST on 1/18/2026, Browns Ferry Unit 1 high pressure coolant injection (HPCI) was declared inoperable due to 1-FCV-073-0006A, [HPCI steam line condensate inboard drain valve], and 1-FCV-073-0006B, [HCPI steam line condensate inboard drain valve], being found closed.

"This condition is being reported as an 8-hour non-emergency notification per 10-CFR 50.72(b)(3)(v).

"There was no impact to the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified."

The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
The HCPI steam line condensate inboard and outboard drain valves are air operated solenoid valves that failed closed. The cause is under investigation and restoration to the normal open position is currently in process. Technical Specification 3.3.5.1 Condition C was entered with a 14-day limiting condition for operation (LCO).