ENS 43593

v t e ENS Event
14:47 Aug 24, 2007
Title	Reactor Trip Breaker Undervoltage Trip Failure During Surveillance Testing
Event Description	During routine surveillance testing on Unit 1 'B' Train Solid State Protection System, per FNP-1-STP-33.2B, the 'B' Train Rx Trip Breaker Failed to trip when a trip signal was sent from one of the manual function test push buttons. Indicated voltage did go to zero, but the Reactor Trip Breaker did not open. Per the testing sequence, the shunt trip for this breaker was being blocked at this time. A timeout was taken to determine the best course of action. Following discussions with Shift Manager, Duty manager, Emergency Director, and Electrical Maintenance supervision, it was decided to determine if the breaker would trip via the shunt trip mechanism. The surveillance testing was continued, and the 'B' Reactor Trip Breaker opened when the test signal was again inserted with the shunt trip unblocked. The 'B' Reactor Trip Breaker was replaced with a new breaker, and was subsequently tested sat per applicable sections of the surveillance test procedure. This event did not result an any offsite radiation release, and did not pose a threat to the general public.*** The licensee informed the NRC Resident Inspector.

ENS 43593 +/-
Where
Farley Alabama (NRC Region 2)
Reporting

Other Unspec Reqmnt
Time - Person (Reporting Time:+0.63 h0.0263 days <br />0.00375 weeks <br />8.62974e-4 months <br />)
Opened:	Scott Smith 15:25 Aug 24, 2007
NRC Officer:	Steve Sandin
Last Updated:	Aug 24, 2007
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v t e Emergency Notification System
Farley with Other Unspec Reqmnt
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