Event Notification Report for October 17, 2023

OFFSITE NOTIFICATION

The following is a summary of information provided by the licensee via phone and email:

Two trespassers were observed by the central alarm station operator via site security cameras on the southeast end of the Maine Yankee property. Both trespassers observed to be carrying equipment to conduct manual digging for fish bait. Local law enforcement was called and responded to the Maine Yankee site. Law enforcement officers from Wiscasset Police and Lincoln County Sheriffs Department contacted both individuals and advised they had trespassed onto Maine Yankee property. Both trespassers apologized for their actions and were fully compliant with the officers. They were both advised and agreed to remain off Maine Yankee Property in the future. Their conduct was not deemed suspicious.

AGREEMENT STATE - GREATER THAN ANTICIPATED DOSE TO NON-TARGET ORGAN

The following information was provided by the New Hampshire Radiological Health Section (NHRHS) via email:

"Via telephone on October 9, 2023, the licensee's Radiation Safety Officer reported a medical event associated with use of their Varian BRAVOS high dose rate remote afterloader (HDR).

"During a treatment fraction administered on October 5, 2023, a patient received a dose of 435 centigray (cGy) (435 rad) versus a planned dose of 700 cGy (700 rad) to the target organ (the cervix) and an estimated 586 cGy (586 rad) versus an expected 300 cGy (300 rad) to the rectum (a non-targeted organ). The dose to the non-target organ exceeds 50 percent of the expected value had the procedure been given in accordance with the written directive.

"The preliminary findings indicate the wrong HDR channel had been selected. The patient and physician were notified. No health effects are anticipated as a consequence of this event. When the treatment fractions are completed, the target organ will have received a dose within 20 percent of the written directive.

"The patient and the patient's physician were advised. No negative health effects are anticipated. Treatment fractions will continue to ensure the desired dose to the target area will be provided. The investigation, with possible identification of further corrective actions, is ongoing. More information is anticipated within 15 days.

"Medical Event: Exposure to a non-target organ exceeding 50 percent of anticipated during a fractional treatment. Dose intended to target organ planned / actual: 700 cGy (700 rad) / 435 cGy (435 rad); 62 percent of planned. Dose to non-target organ anticipated / actual: 300 cGy (300 rad) / 586 cGy (586 rad); 95 percent greater than anticipated."

NMED Report Number: NH-23-0002

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 - MISSING SOURCE FOLLOWING VEHICLE ACCIDENT

The following information was provided by the North Dakota Department of Environmental Quality (DEQ), Radiation Control Program via phone and email:

The Radiation Safety Officer (RSO) for DMS Health Technologies Incorporated informed the North Dakota DEQ that a mobile nuclear medicine truck was involved in a vehicle accident around 1400 CDT, one to two miles east of Lakota, ND on Highway 2.

The RSO reported that a 10 mCi Co-57 sheet source was unaccounted for. One red ammo can containing a CS-137 and a Ba-133 source, as well as a 500 nanocurie rod source, were found undamaged at the scene.

North Dakota Highway Patrol is currently on the scene.

NMED Number: ND230002

National Response Center report number: 1381310.

* * * UPDATE ON 10/9/23 AT 1845 EDT FROM JANELL ANDERSON TO ADAM KOZIOL * * *

The licensee's RSO contacted North Dakota DEQ to report that the missing Co-57 source had been located at the scene of the vehicle accident.

Notified R4DO (Kellar), NMSS, ILTAB, and CNSC (email).

THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF RADIOACTIVE MATERIAL

Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf

UNUSUAL EVENT DUE TO FIRE NOT VERIFIED TO BE EXTINGUISHED WITHIN 15 MINUTES

The following information was provided by the licensee:

At 2256 EDT on October 15, 2023, Brunswick declared a Notification of Unusual Event due to a fire not extinguished within 15 minutes. The licensee received fire alarms and indication of a halon discharge in the basement of the emergency diesel generator building. Due to the delay in the entry into the area, the licensee was not able to verify that the fire was out within 15 minutes. Upon entry into the room, the licensee noted an acrid odor near a transformer, but there was not a fire in the room. The fire was declared out at 2310 EDT.

The licensee notified the NRC Resident Inspector.

Notified DHS SWO, FEMA Operations Center, CISA Central, FEMA NWC (email), CWMD Watch Desk (email), DHS NRCC THD Desk (email), and DHS Nuclear SSA (email).

* * * UPDATE AT 0047 EDT ON 10/16/2023 FROM JOSEPH STRNAD TO BILL GOTT * * *

The following information was provided by the licensee via email:

"Termination of Unusual Event due to verification of no fire in the basement of the emergency diesel generator building."

The licensee terminated the Unusual Event at 0045 on 10/16/23.

The licensee notified the NRC Resident Inspector.

Notified R2DO (Miller), IR-MOC (Grant), NRR-EO (Felts), DHS-SWO, FEMA Ops Center, CISA Central, FEMA NWC (email), CWMD Watch Desk (email), DHS NRCC THD Desk (email), and DHS Nuclear SSA (email).