ENS 55480: Difference between revisions

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| NRC officer = Ossy Font
| NRC officer = Ossy Font
| event date = 07/20/2021 14:01 MDT
| event date = 07/20/2021 14:01 MDT
| last update date = 09/17/2021
| last update date = 11/08/2021
| title = Caas Alarm Not Clearly Audible
| title = Caas Alarm Not Clearly Audible
| event text = During routine Criticality Accident Alarm System (CAAS) maintenance on July 20, 2021, UUSA [(URENCO USA)] staff identified an area in which the CAAS alarm was not clearly audible. The alarm was (and is) functioning, but not at an adequate level of sound pressure to meet the acceptance criteria. UUSA arranged compensatory measures which achieve an equivalent safety function within 24 hours in the affected area. The affected area was in the Immediate Evacuation Zone (IEZ), outside of the area in which licensed special nuclear material is handled, used, or stored.
| event text = During routine Criticality Accident Alarm System (CAAS) maintenance on July 20, 2021, UUSA [(URENCO USA)] staff identified an area in which the CAAS alarm was not clearly audible. The alarm was (and is) functioning, but not at an adequate level of sound pressure to meet the acceptance criteria. UUSA arranged compensatory measures which achieve an equivalent safety function within 24 hours in the affected area. The affected area was in the Immediate Evacuation Zone (IEZ), outside of the area in which licensed special nuclear material is handled, used, or stored.
On September 16, 2021, an NRC inspector conducting an onsite inspection informed UUSA staff that given the potential that the alarm had not been clearly audible for a period of time between surveillances, this event should have been reported within 24 hours to the NRC in accordance with 10 CFR 70.50(b)(2) in which equipment is disabled or fails to function as designed when required by regulation (10 CFR 70.24).
On September 16, 2021, an NRC inspector conducting an onsite inspection informed UUSA staff that given the potential that the alarm had not been clearly audible for a period of time between surveillances, this event should have been reported within 24 hours to the NRC in accordance with 10 CFR 70.50(b)(2) in which equipment is disabled or fails to function as designed when required by regulation (10 CFR 70.24).
The licensee will notify the NRC Region 2.
The licensee will notify the NRC Region 2.
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2021/20210927en.html#en55480
* * * UPDATE ON 11/8/21 AT 1502 FROM BLAKE BIXEMAN TO KERBY SCALES * * *
During the Apparent Cause Evaluation related to Event Notification 55480, an extent of condition was performed.  This extent of condition revealed three historical examples of inaudible CAAS alarms that were not reported under 10 CFR 70.50(b)(2) as required by regulation.
These conditions occurred on April 12th, 2014, August 15th, 2014, and August 20th, 2015. 
Corrective actions were implemented for these deficiencies during the approximate time period in which they were identified.  The affected systems are currently compliant with 10 CFR 70.24 regulations.  Details of this extent of condition are documented in UUSA's Corrective Action Program, EV 148663.
The licensee notified NRC Region 2 personnel.
Notified R2DO (Miller) and NMSS Event Notifications via email.
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2021/20211109en.html#en55480
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Revision as of 08:30, 9 November 2021

ENS 55480 +/-
Where
Louisiana Energy Services
Eunice, New Mexico (NRC Region 2)
License number: SNM-2010
Reporting
10 CFR 70.50(b)(2)
Time - Person (Reporting Time:+1412.9 h58.871 days <br />8.41 weeks <br />1.935 months <br />)
Opened: Blake Bixenman
16:55 Sep 17, 2021
NRC Officer: Ossy Font
Last Updated: Nov 8, 2021
55480 - NRC Website
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