ENS 48327: Difference between revisions
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| event date = 09/20/2012 12:40 CDT | | event date = 09/20/2012 12:40 CDT | ||
| last update date = 09/20/2012 | | last update date = 09/20/2012 | ||
| title = Loss | | title = Loss of Emergency Assessment Capability Due to Inoperable Seismic Monitoring Instrumentation | ||
| event text = At 1240 CDT on 9/20/2012, Operations personnel determined that Browns Ferry Nuclear Plant had experienced a loss of assessment capability. The loss of assessment capability identified was due to not having functional seismic monitoring instrumentation during performance of a modification. The loss of seismic monitoring capability was determined to have existed from 8/17/2012 until 9/15/2012. | | event text = At 1240 CDT on 9/20/2012, Operations personnel determined that Browns Ferry Nuclear Plant had experienced a loss of assessment capability. The loss of assessment capability identified was due to not having functional seismic monitoring instrumentation during performance of a modification. The loss of seismic monitoring capability was determined to have existed from 8/17/2012 until 9/15/2012. | ||
The ability to declare an Unusual Event per Emergency Action Level 7.1-U or an Alert per Emergency Action Level 7.1-A could potentially be hampered by the unavailability of the seismic monitoring instrumentation, because the declarations would be based on personnel feeling an earthquake. In addition, the unavailability of the seismic monitoring instrumentation could potentially hamper the operators in determining the magnitude of an earthquake in order to determine if it reached Operating Basis Earthquake levels or Safe Shutdown Earthquake levels. Therefore, this event is being considered reportable as it results in a loss of emergency assessment capability. Compensatory measures were established on 9/15/2012 which restored assessment capability. | The ability to declare an Unusual Event per Emergency Action Level 7.1-U or an Alert per Emergency Action Level 7.1-A could potentially be hampered by the unavailability of the seismic monitoring instrumentation, because the declarations would be based on personnel feeling an earthquake. In addition, the unavailability of the seismic monitoring instrumentation could potentially hamper the operators in determining the magnitude of an earthquake in order to determine if it reached Operating Basis Earthquake levels or Safe Shutdown Earthquake levels. Therefore, this event is being considered reportable as it results in a loss of emergency assessment capability. Compensatory measures were established on 9/15/2012 which restored assessment capability. | ||
Latest revision as of 22:03, 1 March 2018
| Where | |
|---|---|
Browns Ferry  Alabama (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+3.12 h0.13 days <br />0.0186 weeks <br />0.00427 months <br />) | |
| Opened: | William Ball 20:47 Sep 20, 2012 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Sep 20, 2012 |
| 48327 - NRC Website
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