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| Entered date | Event description | |
|---|---|---|
| ENS 57216 | 9 July 2024 09:30:00 | 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 |
| ENS 55288 | 3 June 2021 10:04:00 | Event meets ACD2-RG-044 App. B N.1 'The licensee shall notify the NRC Operations Center of any event or situation, related to the health and safety of the public or onsite personnel, or protection of the environment, for which a news release is planned or notification to other government agencies has been or will be made. Such an event may include an on-site fatality or inadvertent release of radioactively contaminated materials.'" Received preliminary notification from TestAmerica Colorado that there was an exceedance of the Total Suspended Solids NPDES permit limit at Outfall 013. This was not unexpected with the current state of the settling pond above Outfall 013. An Ohio EPA (OEPA) 24 hour non-compliance notification form was filled out and sent to OEPA NPDES inspector. Notification (to NRC) concurrent to the OEPA notification. |
| ENS 55276 | 26 May 2021 18:10:00 | Event meets ACD2-RG-044 App. B N.1 'The licensee shall notify the NRC Operations Center of any event or situation, related to the health and safety of the public or onsite personnel, or protection of the environment, for which a news release is planned or notification to other government agencies has been or will be made. Such an event may include an on-site fatality or inadvertent release of radioactively contaminated materials.' Received preliminary notification from TestAmerica Colorado that there was an exceedance of the Total Suspended Solids NPDES (National Pollution Discharge Elimination System) permit limit at Outfall 013. This was not unexpected with the current state of the settling pond above Outfall 013. An Ohio EPA (OEPA) 24 Hour non-compliance notification form was filled out and sent it to our OEPA NPDES inspector. Notification concurrent to the OEPA notification. |