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This 60-day telephone notification is bein … This 60-day telephone notification is being made per the reporting requirements specified by 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1) to describe an invalid actuation of a general containment isolation signal affecting more than one system.</br>On April 9, 2013, at 0506 hours Central Daylight Time (CDT), during placement of clearance 2-TO-2013-0003, section 2-099-0001, Browns Ferry Nuclear Plant (BFN), Unit 2, received Primary Containment Isolation System (PCIS) Groups 2, 3, 6, and 8 isolation signals. The PCIS Groups 2, 3, 6, and 8 isolations caused the initiation of all three trains of the Standby Gas Treatment (SBGT) system and Control Room Emergency Ventilation (CREV) subsystem 'A', and isolations of the BFN, Unit 2, Reactor Zone ventilation and BFN, Units 1, 2, and 3, Refuel Zone ventilation. Operations personnel responded to the PCIS initiation, ensured all equipment operated as designed, and stopped the clearance placement.</br>Plant conditions which initiate PCIS Group 2 actuations are Reactor Vessel Low Water Level (Level 3) or High Drywell Pressure. The PCIS Group 3 actuations are initiated by Reactor Vessel Low Water Level (Level 3) or Reactor Water Cleanup Area High Temperature. The PCIS Group 6 actuations are initiated by Reactor Vessel Low Water Level (Level 3), High Drywell Pressure, or Reactor Building Ventilation Exhaust High Radiation (Reactor Zone or Refuel Zone). The PCIS Group 8 actuations are initiated by Low Reactor Vessel Water Level (Level 3) or High Drywell Pressure. At the time of the event, these conditions did not exist; therefore, the actuation of the PCIS was invalid.</br>The apparent cause for this condition was the outage tagging personnel did not prepare clearance 2-TO-2013-0003 section 2-099-0001 as a stand alone clearance, detail the effect on PCIS initiation on cover placement instructions, place clearance 2-TO-2013-0003 in the right sequence, and perform a thorough review of clearance 2-TO-2013-0003 section 2-099-0001 to identify the missing detail related to PCIS initiation. Personnel performance issues are being addressed in accordance with the Tennessee Valley Authority policies and processes.</br>There were no safety consequences or impact to the health and safety of the public as a result of this event.</br>This event was entered into the Corrective Action Program as Problem Evaluation Report 711266.</br>The NRC Resident Inspector has been notified of this event.Inspector has been notified of this event.
10:06:00, 9 April 2013 +
49,077 +
11:06:00, 29 May 2013 +
10:06:00, 9 April 2013 +
This 60-day telephone notification is bein … This 60-day telephone notification is being made per the reporting requirements specified by 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1) to describe an invalid actuation of a general containment isolation signal affecting more than one system.</br>On April 9, 2013, at 0506 hours Central Daylight Time (CDT), during placement of clearance 2-TO-2013-0003, section 2-099-0001, Browns Ferry Nuclear Plant (BFN), Unit 2, received Primary Containment Isolation System (PCIS) Groups 2, 3, 6, and 8 isolation signals. The PCIS Groups 2, 3, 6, and 8 isolations caused the initiation of all three trains of the Standby Gas Treatment (SBGT) system and Control Room Emergency Ventilation (CREV) subsystem 'A', and isolations of the BFN, Unit 2, Reactor Zone ventilation and BFN, Units 1, 2, and 3, Refuel Zone ventilation. Operations personnel responded to the PCIS initiation, ensured all equipment operated as designed, and stopped the clearance placement.</br>Plant conditions which initiate PCIS Group 2 actuations are Reactor Vessel Low Water Level (Level 3) or High Drywell Pressure. The PCIS Group 3 actuations are initiated by Reactor Vessel Low Water Level (Level 3) or Reactor Water Cleanup Area High Temperature. The PCIS Group 6 actuations are initiated by Reactor Vessel Low Water Level (Level 3), High Drywell Pressure, or Reactor Building Ventilation Exhaust High Radiation (Reactor Zone or Refuel Zone). The PCIS Group 8 actuations are initiated by Low Reactor Vessel Water Level (Level 3) or High Drywell Pressure. At the time of the event, these conditions did not exist; therefore, the actuation of the PCIS was invalid.</br>The apparent cause for this condition was the outage tagging personnel did not prepare clearance 2-TO-2013-0003 section 2-099-0001 as a stand alone clearance, detail the effect on PCIS initiation on cover placement instructions, place clearance 2-TO-2013-0003 in the right sequence, and perform a thorough review of clearance 2-TO-2013-0003 section 2-099-0001 to identify the missing detail related to PCIS initiation. Personnel performance issues are being addressed in accordance with the Tennessee Valley Authority policies and processes.</br>There were no safety consequences or impact to the health and safety of the public as a result of this event.</br>This event was entered into the Corrective Action Program as Problem Evaluation Report 711266.</br>The NRC Resident Inspector has been notified of this event.Inspector has been notified of this event.
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00:00:00, 29 May 2013 +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
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11:06:00, 29 May 2013 +
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50.042 d (1,201 hours, 7.149 weeks, 1.645 months) +
10:06:00, 9 April 2013 +
URL"URL" is a <a href="/Special:Types/URL" title="Special:Types/URL">type</a> and predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> to represent URI/URL values.