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At 1845 CDT on June 13, 2016, TVA Corporat … At 1845 CDT on June 13, 2016, TVA Corporate Emergency Preparedness notified the Shift Manager at Browns Ferry Nuclear Plant that eight of the BFN (Browns Ferry Nuclear) Alert & Notification Sirens (19, 39, 55, 59, 60, 61, 69, 95) failed to rotate. The sirens were activated at 0915 CDT. Post sounding siren feedback indicated thirteen sirens that failed to rotate. BFN EP (Emergency Preparedness) Senior Instrument Mechanics were dispatched to inspect the thirteen sirens and determined, through field inspections that only eight sirens would not rotate. The field inspection was completed and communicated to Corporate Emergency Preparedness at 1733 CDT. </br>Per NPG-SPP-03.5.1, the affected sirens which were lost affect 25.1 percent of the Emergency Planning Zone (EPZ) population and the sirens are not expected to be returned to service within 24 hours. Per NPG-SPP-03.5.1, a Loss of Alert and Notification System Capability exists when there is an unplanned or planned loss of primary Alert and Notification System (ANS) equipment for greater than one hour resulting in a loss of capability to alert 25 percent or more of the total Emergency Planning Zone (EPZ) population and either the Federal Emergency Management Agency (FEMA) approved backup alerting method cannot be implemented for the area affected by the lost primary ANS equipment OR the primary ANS equipment is not expected to be returned to service within 24 hours. </br>TVA Corporate Emergency Preparedness is redirecting a team from Watts Bar Nuclear Plant to commence repairs on Wednesday 6/15/2016.</br>This 8 hour notification is being made per the reporting requirements specified by 10 CFR 50.72(b)(3)xiii.</br>The NRC Resident Inspector has been notified.</br>This event has been entered in the Corrective Action Program.</br>* * * EVENT RETRACTION FROM MARK MOEBES TO RICHARD SMITH AT 0538 EDT ON 7/08/2016 * * *</br>The licensee is retracting this event notification.</br>Upon further evaluation using siren modeling software, back-up route alerting was deemed unnecessary since the overlap from neighboring sirens provided the required minimum siren coverage over all populated areas within the EPZ. The TVA siren system provides significant acoustic overlap that is not completely accounted for in the population factors used to initially determine the impacted population for the purposes of reportability. During the event, BFN remained capable of providing adequate siren coverage, and the loss of ANS equipment impacted less than 25 percent of the population within the EPZ. Therefore, this was not a reportable event.</br>The NRC Resident Inspector has been notified.</br>Notified the RII RDO (Seymour).been notified.
Notified the RII RDO (Seymour).
22:33:00, 13 June 2016 +
52,004 +
22:13:00, 13 June 2016 +
22:33:00, 13 June 2016 +
At 1845 CDT on June 13, 2016, TVA Corporat … At 1845 CDT on June 13, 2016, TVA Corporate Emergency Preparedness notified the Shift Manager at Browns Ferry Nuclear Plant that eight of the BFN (Browns Ferry Nuclear) Alert & Notification Sirens (19, 39, 55, 59, 60, 61, 69, 95) failed to rotate. The sirens were activated at 0915 CDT. Post sounding siren feedback indicated thirteen sirens that failed to rotate. BFN EP (Emergency Preparedness) Senior Instrument Mechanics were dispatched to inspect the thirteen sirens and determined, through field inspections that only eight sirens would not rotate. The field inspection was completed and communicated to Corporate Emergency Preparedness at 1733 CDT. </br>Per NPG-SPP-03.5.1, the affected sirens which were lost affect 25.1 percent of the Emergency Planning Zone (EPZ) population and the sirens are not expected to be returned to service within 24 hours. Per NPG-SPP-03.5.1, a Loss of Alert and Notification System Capability exists when there is an unplanned or planned loss of primary Alert and Notification System (ANS) equipment for greater than one hour resulting in a loss of capability to alert 25 percent or more of the total Emergency Planning Zone (EPZ) population and either the Federal Emergency Management Agency (FEMA) approved backup alerting method cannot be implemented for the area affected by the lost primary ANS equipment OR the primary ANS equipment is not expected to be returned to service within 24 hours. </br>TVA Corporate Emergency Preparedness is redirecting a team from Watts Bar Nuclear Plant to commence repairs on Wednesday 6/15/2016.</br>This 8 hour notification is being made per the reporting requirements specified by 10 CFR 50.72(b)(3)xiii.</br>The NRC Resident Inspector has been notified.</br>This event has been entered in the Corrective Action Program.</br>* * * EVENT RETRACTION FROM MARK MOEBES TO RICHARD SMITH AT 0538 EDT ON 7/08/2016 * * *</br>The licensee is retracting this event notification.</br>Upon further evaluation using siren modeling software, back-up route alerting was deemed unnecessary since the overlap from neighboring sirens provided the required minimum siren coverage over all populated areas within the EPZ. The TVA siren system provides significant acoustic overlap that is not completely accounted for in the population factors used to initially determine the impacted population for the purposes of reportability. During the event, BFN remained capable of providing adequate siren coverage, and the loss of ANS equipment impacted less than 25 percent of the population within the EPZ. Therefore, this was not a reportable event.</br>The NRC Resident Inspector has been notified.</br>Notified the RII RDO (Seymour).been notified.
Notified the RII RDO (Seymour).
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00:00:00, 8 July 2016 +
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