ENS 53604
ENS Event | |
|---|---|
06:00 Sep 15, 2018 | |
| Title | Preplanned Outage of a Required Safety Monitoring System |
| Event Description | The UUSA [URENCO USA] facility CAAS [Criticality Accident and Alarm System] exists to detect and alarm in the unlikely event of a criticality accident, as required by 10 CFR 70.24, Criticality accident requirements. This monitoring system will be temporarily disabled during planned corrective maintenance activities for approximately thirty minutes, commencing at approximately 0730 MDT, on Saturday, September 15th, 2018. This activity will affect the CAAS in the Separations Building Module (SBM) 1001/1002 and the Cylinder Receipt and Dispatch Building (CRDB). The CAAS in the remaining portions of the facility will be unaffected.
Essential personnel will remain inside the controlled access area during the maintenance activities. The populated areas of the facility will be limited to the Security Alarm Station, Operations Control Room, and the Maintenance Area housing the CAAS control cabinets in the Technical Services Building (TSB) where technicians will be needed for this work evolution. CAAS coverage of these populated areas will be provided during the maintenance activity by temporary criticality detection equipment. Compensatory measures will be implemented in accordance with section 3.1.5 of the UUSA Integrated Safety Analysis (ISA) Summary. These measures including evacuation of non-essential personnel from the areas of concern and the Immediate Evacuation Zone (IEZ) before removing the equipment from service, limiting access into facility, and restricting Special Nuclear Material (SNM) movement will be implemented until CAAS coverage is verified operational. UUSA will notify the NRC when CAAS coverage is returned to normal operation. Radiation surveys will be conducted prior to re-entry to confirm acceptable conditions in the area. The licensee has notified the NRC Project Manager.
The Criticality Accident and Alarm System was returned to service at 0930 MDT after the completion of the scheduled maintenance. During the maintenance period, no abnormal radiation readings were observed. Notified R2DO (Ernstes). |
| Where | |
|---|---|
| Louisiana Energy Services Eunice, New Mexico (NRC Region 2) | |
| License number: | SNM-2010 |
| Reporting | |
| Information Only 10 CFR 70.50(b)(2) | |
| Time - Person (Reporting Time:+-18.52 h-0.772 days <br />-0.11 weeks <br />-0.0254 months <br />) | |
| Opened: | Wyatt Padgett 11:29 Sep 14, 2018 |
| NRC Officer: | Thomas Kendzia |
| Last Updated: | Sep 15, 2018 |
| 53604 - NRC Website | |
Louisiana Energy Services with Information Only, 10 CFR 70.50(b)(2) | |
WEEKMONTHYEARENS 565502023-06-01T08:39:0001 June 2023 08:39:00
[Table view]10 CFR 70.50(b)(2) Partial Loss of Criticality Accident Alarm System ENS 555642021-11-05T18:07:0005 November 2021 18:07:00 10 CFR 70.50(b)(2) Loss of High Radiation Audible Alarm ENS 554802021-07-20T20:01:00020 July 2021 20:01:00 10 CFR 70.50(b)(2) CAAS Alarm Not Clearly Audible ENS 536042018-09-15T06:00:00015 September 2018 06:00:00 Information Only, 10 CFR 70.50(b)(2) Preplanned Outage of a Required Safety Monitoring System ENS 530462017-09-07T06:00:0007 September 2017 06:00:00 10 CFR 70.50(b)(2) Wrong Irofs Procedure Followed Prior to Filling Cylinder ENS 515932015-12-07T23:00:0007 December 2015 23:00:00 10 CFR 70.50(b)(2) Crane Item Relied Upon for Safety Never Installed 2023-06-01T08:39:00 | |