Event Notification Report for June 24, 2025

AGREEMENT STATE REPORT - POSSIBLE OVEREXPOSURE

The following information was provided by the Washington State Department of Health (the Department) via email:

"In early March 2025, a mixed-waste operator at Perma-Fix Northwest (PFNW) sustained a finger sliver while processing waste. Although the wound frisked clean, split 24-hour urinalysis later that month revealed 0.07 and 0.06 pCi Pu per L, projecting a maximum committed effective dose (CEDE) of up to 6 rem. PFNW did not alert the Department until June 10, 2025, about sixty days after receiving the positive result, and still has not submitted the 30-day written report that was due on April 28, 2025. These delays violate the 24-hour telephone-notification and 30-day written-report provisions of WAC 246-221-250, both incorporated into PFNW's licenses via license condition 11. Bioassay follow-up, dose modelling, and record updates have also lagged, contravening license condition 21, while no timely radiological unusual event file was routed to the Department as required by license condition 23.

"No chelation therapy (Ca- or Zn-DTPA) was administered, and the contract certified health physicist (CHP) did not document why none was indicated. Immediate corrective actions included and include retro-logging the 24-hour call, submitting an overdue SA-300 written report within five working days, and certifying the committed dose by June 20, 2025. They are also to provide supporting records for the Department to review during the June 24, 2025 on-site inspection. Should the final dose exceed 5 rem CEDE, PFNW will breach the annual dose limit in WAC 246-221-010(1), and the dose must then be subtracted from the worker's planned-special-exposure allowance under subsection (2). In summary, PFNW's failures in notification, reporting, and bioassay execution constitute serious compliance deficiencies that require immediate, documented remediation to protect the worker and restore conformity with state and license requirements.

"As the maximum calculated CED exceeds 5 rem, this event is being reported as a possible overexposure.

"The Department is conducting a responsive investigation."

Washington Incident File: WNS-INC-25-04

AGREEMENT STATE REPORT - LOST SEED

The following is a summary of information provided by the New York City Department of Health via email:

The licensee reported a loss of licensed material in quantity more than 10 times the value in 10 CFR Part 20 Appendix C. Memorial Sloan-Kettering reported via email on 5/22/2025 that a I-125 localization seed was discovered to be lost by the licensee on 3/25/2025 during a routine reconciliation. The seed had been implanted in a patient on 3/20/2025 and explanted on 3/21/2025. The activity was estimated as 115 microcuries on the date of clinical use.

New York Identification Number: NY250004

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

AGREEMENT STATE REPORT - LOST SEED

The following is a summary of information provided by the New York City (NYC) Department of Health via email:

The licensee reported a loss of licensed material in quantity more than 10 times the value in 10 CFR Part 20 Appendix C. Memorial Sloan-Kettering reported via email on 5/22/2025 that a I-125 localization seed was discovered to be lost by the licensee on 3/26/2025 during an inventory. A discarded seed from a procedure done on 1/23/2025 was not able to be located. The activity was estimated as 98 microcuries on the date of use.

New York Identification Number: NY250005

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

VALID EMERGENCY DIESEL GENERATOR START

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

"At 2204 EDT on 6/22/2025, with unit 1 and unit 2 operating at 100 percent power, the 'A' reserve station service transformer (RSST) was lost which resulted in the loss of power to the '1J' emergency bus. As a result of the power loss, the '1J' emergency diesel generator (EDG) automatically started as designed and restored power to the '1J' emergency bus. During the event, the unit 1 'A' charging pump (1-CH-P-1A) automatically started as designed due to the loss of power event. Security footage reported a bright white flash associated with the 'A' RSST at the time of the event.

"The valid actuation of these ESF components due to loss of electrical power is reportable per 10 CFR 50.72(b)(3)(iv)(A).

"The '1J' emergency bus off-site power source was restored to service via an alternate source and the '1J' EDG was secured and returned to automatic. Restoration of offsite power to operable is complete. 1-CH-P-1A was secured and returned to automatic. Both units are currently stable, and an investigation is underway to determine the cause of the loss of the 'A' RSST."

Unit 2 was unaffected. The NRC resident inspector was notified.