ENS 46847

v t e ENS Event
23:25 May 12, 2011
Title	Loss of Shutdown Cooling
Event Description	At 1825 CDT on 05/12/2011, with Browns Ferry Nuclear Plant Unit 3 in Mode 4, Browns Ferry Nuclear Plant PCIS [Primary Containment Isolation System] relay maintenance activities for a Group 1 PCIS relay inadvertently interrupted the neutral for a Group 2 PCIS relay and a Group 2 PCIS isolation occurred resulting in a loss of Shutdown Cooling. Relays were reset and Shutdown Cooling was restored at 1905 CDT. Moderator temperature prior to the event was 112.5 degrees F and the highest moderator temperature recorded during the loss of Shutdown Cooling was 122 degrees F. This condition is reportable under 10CFR50.72(b)(3)(v) - Any event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to: B.) Remove residual heat. This is also reportable as a 60 day written report IAW 10CFR 50.73(a)(2)(v). The NRC Resident Inspector has been notified of this event. This event was entered into the licensee's Corrective Action Program as SR# 368205".

ENS 46847 +/-
Where
Browns Ferry Alabama (NRC Region 2)
Reporting

10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat
Time - Person (Reporting Time:+2.47 h0.103 days <br />0.0147 weeks <br />0.00338 months <br />)
Opened:	Ricky Givens 01:53 May 13, 2011
NRC Officer:	John Knoke
Last Updated:	May 13, 2011
46847 - NRC Website
v • d • e

v t e Emergency Notification System
Browns Ferry with 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat
WEEKMONTHYEAR2017-09-10T16:51:00 [Table view]
[ENS list for Browns Ferry]

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