Event Notification Report for August 02, 2024

EN Revision Imported Date: 8/2/2024

EN Revision Text: PRIMARY CONTAINMENT ISOLATION DUE TO LOSS OF RPS POWER SUPPLY

The following information was provided by the licensee via fax or email:

"On June 4, 2024, at 2141 PDT, with the unit in Mode 1 at 100 percent power, the reactor protection system (RPS) 'B' power supply unexpectedly de-energized which caused containment isolations to occur in reactor water clean up, equipment drains radioactive, floor drains radioactive, reactor recirculation, and traversing in-core probe systems. All actuations occurred as designed upon the partial loss of RPS power.

"This event is being reported pursuant to 10 CFR 50.72(b)(3)(xiii) as a major loss of emergency assessment capability due to the inability to assess primary containment identified and unidentified leakage rates. Emergency assessment capability was restored at 2204."

The NRC Senior Resident has been notified.

* * * UPDATE ON 8/1/24 AT 1925 EDT FROM CHASE WILLIAMS TO ADAM KOZIOL * * *

"A clarification for reactor recirculation valve isolation above - the flow path was administratively isolated prior to the event.

"After further evaluation it has been confirmed that the containment isolations were not caused due to any actual plant conditions or system parameters that satisfied the requirements for isolation. The isolations were a result of loss of power to the RPS 'B' bus and therefore are not considered valid actuations.

"As indicated in 10 CFR 50.73(a)(1), in the case of an invalid actuation reported under 10 CFR 50.73(a)(2)(iv)(A), the licensee may, at its option, provide a telephonic notification to the NRC Operations Center within 60 days of discovery of the event instead of submitting a written licensee event report. This 60-day telephone notification is being made in accordance with 10 CFR 50.73(a)(1) for invalid actuations reported under 10 CFR 50.73(a)(2)(iv)(A)."

Notified R4DO (Werner)

AGREEMENT STATE REPORT - FOUND SOURCE

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

"On 7/16/2024, the Agency was notified that the licensee found a box with seven calibration rod sources stored in the previous radiation safety officer's desk. The licensee had previously been cited for poor source accountability. The replacement of the radiation safety officer (RSO) and the use of a consultant were implemented as corrective actions. Locating and reporting these sources is a result of those efforts. The New England Nuclear gamma reference rod source set (Catalog No. NES-100T) contains a Co-57, Co-60, Cd-109, Ba-133, Cs-137, Mn-54, and Na-22 source - each with a nominal activity of 7 microcuries. While the sources were labeled as exempt when distributed in 1977, the Co-60 and Cd-109 sources appear to no longer be exempt under current regulations (10 CFR 30.71 Schedule B), nor does any exemption exist that grandfathers these sources. Wipe tests were performed and indicated no leakage.

"In accordance with SA-300, section 5.6.2, 'found sources' are to be reported when they exceed 10 times the value specified in Appendix C to 10 CFR Part 20. The Cd-109 source contained 12.9 microcuries when assayed 9/6/77, so, it remains reportable. The sources were placed on the licensee's sealed source inventory. Corrective action is adequate, and this matter is now considered closed."

IL Event Number: IL240016

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 SOURCE

The following information was provided by the Virginia Radioactive Materials Program (the Department) via email:

"On July 26, 2024, at approximately 1440 EDT, the VDH [Virginia Department of Health] Office of Radiological Health was contacted by the radiation safety officer (by phone) from Molecular Imaging Services, Inc. to report a missing Co-57 reference source of 5.257 mCi. On July 25, the licensee discovered that a package that had contained the source was delivered on July 3, and was inadvertently disposed of in the trash. It was not known by the nuclear medicine staff until July 25, that the source had been delivered on July 3 and that their investigation determined that the unopened package was placed in the dumpster by the facility janitor. The licensee has confirmed that the dumpster was picked up on July 6 and has been disposed of in the Prince William County Sanitary Landfill.

"The Department will follow up with an investigation."

Virginia Event Report ID No.: VA240003

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