Event Notification Report for July 17, 2024

CRITICALITY ACCIDENT AND ALARM SYSTEM OUT OF SERVICE FOR TESTING

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

"The American Centrifuge Plant (ACP) criticality accident and alarm system (CAAS) is designed to detect a nuclear criticality accident and provide audible and visual alarms that alert personnel to evacuate the immediate area, as required by 10 CFR 70.24, criticality accident requirements.

"The CAAS will be temporarily disabled (declared inoperable in accordance with approved plant procedures) to perform periodic CAAS testing activities. The planned CAAS outage is expected to last for approximately 48 hours, commencing at approximately 0800 EDT, on Wednesday, July 10th, 2024. The planned maintenance activities will affect the CAAS in the X-3001 North.

"Essential personnel will be present inside the controlled access area during the maintenance activities. Compensatory measures will be implemented in accordance with section 5.4.4 of the License Application for the American Centrifuge Plant. These measures include the following: evacuation of non-essential personnel from the area of concern and the immediate evacuation zone (IEZ) before removing CAAS equipment from service; limiting access into the area; restricting fissile material movement; and the use of personal alarming dosimeters for personnel that must access the area during the CAAS outage. These measures will be implemented until CAAS coverage is verified to be operational and the CAAS is declared operable in accordance with approved plant procedures.

"American Centrifuge Operating, LLC (ACO) will notify the NRC when CAAS coverage is returned to normal operation.

"The licensee has notified the NRC Project Manager."

ACP condition notification #11933

AGREEMENT STATE REPORT - STUCK OPEN SHUTTER
The following information was received from the state of Nevada via email:

"Nevada Gold Mines LLC - Goldstrike, [Nevada license] 05-11-13545-01, reported a stuck open shutter on a Berthold LB 7440, serial number 1459. The fixed gauge remains installed pending the arrival of a contractor to replace the failed shutter. Radiation surveys of the installed gauges are as expected for a gauge in service giving 0.11 mR/hour 1 foot back from the gauge (in walkway). Gauge is installed in a location where there is occasional foot traffic, providing no additional exposure mine/mill staff until it can be repaired. Licensee [was] reminded to report the failure to the manufacturer in accordance with the operations and maintenance manual for the gauge."

The gauge contains 50 mCi of Cs-137. The state of Nevada considers this event closed.

Nevada Item Number: NV240005

AGREEMENT STATE REPORT - STUCK SHUTTER

The following report was received from the Louisiana Department of Environmental Quality via email:

"A nuclear gauge was stuck in the open shutter position. This event is considered an equipment failure. The failure occurred while BBP (Bonds Barton Pilcher) tried to remove a screw on the rotor on July 2, 2024.

"Marathon Petroleum brought in a third party to work on the nuclear gauge. BBP was the third party. Marathon Petroleum plans on having BBP replace the nuclear gauge with another one as soon as possible."

Device information is as follows:
Model: Ohmart SH-F1A
Serial number: 13524941
Isotope: Cs-137 with an activity of 15 mCi
Source serial number: 65511
The device was acquired in June 2006.

The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
There were no reports of exposures and the licensee has taken measures to prevent future potential exposures.

Louisiana Event Report ID No.: LA20240007

AGREEMENT STATE REPORT - Y-90 UNDERDOSE

The following is a summary of information provided by the New Jersey Department of Environmental Protection (NJDEP) via email:

Kennedy Memorial Hospital University Medical Center (the licensee) was scheduled to administer a Nordion TheraSphere therapy (116 mCi of Y-90) to a patient. The target organ was the right hepatic lobe of the liver. There was a tubing failure in the delivery system and the administration was suspended. It is estimated that only 2.62 mCi (17 percent) of the prescribed dosage was administered.

The patient and referring physician were notified. The patient has been re-scheduled for treatment.

No release of licensed material or contamination was reported.

The licensee will follow-up with a full written report. The licensee is sending the equipment that failed to the manufacturer for detailed analysis.


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.