Event Notification Report for October 12, 2023

AGREEMENT STATE REPORT - LOSS OF CONTROL

The following information was provided by the Florida Bureau of Radiation Control [the Bureau] via email:

"On October 4, 2023, a gamma density gauge (DensityPro Gamma Density System, Model Number 5201A, 20 mCi Cs-137) was discovered in a rejected load of scrap metal at NuCor Steel. The Bureau inspector took custody of the gauge and transported it to Orlando. Upon further cleaning, the description plate revealed a serial and model number. The gauge was determined to belong to James Hardie Building Products (licensee). The licensee will be contacted and further corrective actions will be referred to the materials group at the Bureau."

Florida Incident number - FL23-152

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 - MEDICAL UNDERDOSE

The following information was provided by the Colorado Department of Public Health and Environment (the Agency) via email:

"On October 4, 2023, the radiation safety officer of the University of Colorado Hospital reported a medical event to the emergency response line. The medical event occurred during the administration of a Y-90 TheraSphere treatment that took place that day. The authorized user stated that high back pressure was observed during administration so only 71.2 percent of the prescribed dose was delivered to the treatment area. This is the third medical event (May 18, 2023 - CO230012 and May 24, 2023 - CO230014) with Y-90 TheraSpheres at this facility in the last six months. Different authorized users and IR [Interventional Radiology] technologists were present at each medical event. The Agency is currently waiting for additional information from the hospital and the Agency intends to follow up with an in-person investigation."

Event Report ID No.: CO2300034

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 - FIXED GAUGE STUCK SHUTTER

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

"On October 5, 2023, Covestro LLC (the licensee) reported to the Agency that on September 26, 2023, during routine 6-month checks, the shutter on one of its VEGA SHLG-1 fixed nuclear gauges, containing 1.5 curies cesium-137, was found stuck in the open position. Open is the normal operating position for this gauge. There were no [personnel] exposures and none are anticipated as the gauge is mounted on the side of a vessel and secured from access. The licensee has contacted the manufacturer and is trying to make arrangements for repair or replacement. An investigation into this event is ongoing. More information will be provided as it is obtained in accordance with SA-300."

Texas Incident Number: 10056

REACTOR COOLANT SYSTEM PRESSURE BOUNDARY DEGRADED

The following information was provided by the licensee via email:

"On October 9, 2023, during the Palo Verde Nuclear Generating Station Unit 1 refueling outage, while performing a small nozzle inspection in support of boric acid walkdowns, boric acid leakage was found on the area of the weld of a pressurizer thermowell. At 1507 MST, non-destructive examination of the weld indicated leakage through the reactor coolant pressure boundary. The exam result constitutes welding or material defects in the primary coolant system that are unacceptable under ASME Section XI. This event is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(ii)(A).

"There was no impact on the health and safety of the public or plant personnel.

"The NRC Resident Inspector has been notified."

OFFSITE NOTIFICATION - SPURIOUS ALARM ACTUATION

The following information was provided by the licensee via fax:

"On October 10, 2023, at 1553 CDT, Cooper Nuclear Station (CNS) was notified of a spurious actuation of a single alert notification system siren in Nemaha, Nebraska. The CNS Emergency Alert System (EAS) was not activated. The actuation occurred during siren testing conducted at approximately 1545 CDT. No emergency conditions are present at Cooper Nuclear Station.

"A press release from Nebraska Public Power District is not planned at this time.

"This condition is reportable under 10CFR 50.72(b)(2)(xi) for any event or situation for which a news release is planned or notification to other government agencies has been or will be made which is related to heightened public or government concern.

"The NRC Senior Resident Inspector has been notified."

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

Offsite notification was to local Nemaha County Emergency Management.

60 DAY NOTIFICATION FOR AN INVALID SPECIFIED SYSTEM ACTUATION

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

"This 60-day telephone notification is being made per the reporting requirements specified by 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1) to describe an invalid specific system actuation of the North Anna Power Station Unit 1 Emergency Core Cooling System (ECCS).

"On 6/18/2023, a comparator card power supply associated with 1-CH-PC-1121A, charging pressure low-standby pump start signal comparator, failed and caused the `A' and `B' charging pumps to auto-start and the previously running `C' charging pump to trip and lock-out.

"This event is considered an invalid system actuation because the actuation was not initiated in response to actual plant conditions or parameters and was not a manual initiation. The ECCS pumps functioned as expected in response to the actuation. The `A' Charging pump was shut down in accordance with plant procedures following replacement of the comparator card. There was no impact on the health and safety of the public or plant personnel.

"The reportability requirement was determined beyond the 60-day notification requirement on 9/21/2023. The NRC Resident Inspector has been notified."