05000348/LER-1981-001-03, /03L-0:on 810116,RHR Flow Lost.Caused by Loss of Power to 1A RHR Pump as Result of Feeder Breaker to Start Up Transformer 1A Opening.Diesel Generator 1-2A Energized Bus 1F & RHR Pump Restarted.Transformer 1A re-energized

/03L-0:on 810116,RHR Flow Lost.Caused by Loss of Power to 1A RHR Pump as Result of Feeder Breaker to Start Up Transformer 1A Opening.Diesel Generator 1-2A Energized Bus 1F & RHR Pump Restarted.Transformer 1A re-energized

ML19345F631
Person / Time
Site:	Farley
Issue date:	02/12/1981
From:	Hariston W ALABAMA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345F630	List: 05000348/LER-1981-001, Forwards LER 81-001/03L-0 05000348/LER-1981-001-03, /03L-0:on 810116,RHR Flow Lost.Caused by Loss of Power to 1A RHR Pump as Result of Feeder Breaker to Start Up Transformer 1A Opening.Diesel Generator 1-2A Energized Bus 1F & RHR Pump Restarted.Transformer 1A re-energized
References
LER-81-001-03L, LER-81-1-3L, NUDOCS 8102180646
Download: ML19345F631 (1)

LER-1981-001, /03L-0:on 810116,RHR Flow Lost.Caused by Loss of Power to 1A RHR Pump as Result of Feeder Breaker to Start Up Transformer 1A Opening.Diesel Generator 1-2A Energized Bus 1F & RHR Pump Restarted.Transformer 1A re-energized

Event date:
Report date:
3481981001R03 - NRC Website

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60 61 DOCKET NUMBER 68 63 EV ENT D ATE 74 75 REPORT D ATF.

80 EVENT DESCalPTION AND PROSABLE CONSEQUENCES h lTITl l At 1429 on 1-16-81, RHR flow was lost as a result of a loss of cover to the 1A RHR ou mI

,[5T31 I (A 1088 of power to start-up transformer lA de-energized 4160V. bus IF which in turn 1

l caused a loss of power to the RHR pump.) Tech. Spec. 3.4.1, in part, requires t leastI e

o 4 g l one RC loop to be in operati'on with an associated RC or RHR pump. Tech. Spec. 3.4.1 l

lTriq l action statement requirements were met.

Health / safety of the public were not affected.l lTITl I I

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33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l l, g o g ] Power was lost as a result of a feeder breaker to start-up transformer lA opening. No I relay targets were actuated on the start-up transformer supply breaker to indicate rea-son tor tne trip. Maintenance activity ongoing in the vicinity of the relay probably

'L1_1__I Icaused the breaker to trio.

niaael canar,ene 1 n anave - A % iv and eka nun I

was re-started at 1430 on 1-16-81.

Start-up transformer lA was subsequency re-energized

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and bus 1F.was re-aligned to its normal feed.

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