The following information was provided by the licensee via phone and 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.
Periodic maintenance and testing, of the CAAS, is scheduled to commence on Monday, October 28, 2024, at approximately 0700 EDT. The maintenance and testing is expected to last approximately 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> and affect the X-3001, including the North area. The CAAS will be temporarily taken out of service and declared inoperable, to perform the periodic maintenance and testing in accordance with approved plant procedures.
In accordance with License Application Section 5.4.4 compensatory measures will be implemented for the ACP. These measures include, but may not be limited to the following:
� Presence of essential personnel during the maintenance and testing activities;
� Evacuation of non-essential personnel from affected areas and the immediate evacuation zone prior to taking CAAS equipment out of service;
� Limiting access to the area by restricting material movements, including fissile material movement, while the CAAS is inoperable;
� Use of personal alarming dosimeters for personnel authorized to access the area during the CAAS outage;
� Compensatory measures will remain in place 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 and Region II Senior Inspector.
ACP condition notification number: 12198
The Department of Energy has been notified.