05000348/LER-1979-013-03, /03L-0 on 790227:B1F Sequencer Found in Test Mode, Rendering 1-2A Diesel Generator Inoperable.Caused by Faulty Switch Mechanism.Sequencer Repaired

/03L-0 on 790227:B1F Sequencer Found in Test Mode, Rendering 1-2A Diesel Generator Inoperable.Caused by Faulty Switch Mechanism.Sequencer Repaired

ML19261C733
Person / Time
Site:	Farley
Issue date:	03/22/1979
From:	Hairston W ALABAMA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19261C730	List: 05000348/LER-1979-013, Forwards LER 79-013/03L-0 05000348/LER-1979-013-03, /03L-0 on 790227:B1F Sequencer Found in Test Mode, Rendering 1-2A Diesel Generator Inoperable.Caused by Faulty Switch Mechanism.Sequencer Repaired
References
LER-79-013-03L, LER-79-13-3L, NUDOCS 7903280318
Download: ML19261C733 (1)

LER-1979-013, /03L-0 on 790227:B1F Sequencer Found in Test Mode, Rendering 1-2A Diesel Generator Inoperable.Caused by Faulty Switch Mechanism.Sequencer Repaired

Event date:
Report date:
3481979013R03 - NRC Website

text

N AC FORM 36G U. 3.

.M deGutATORY COMMISSION i7 7D LICENSEE EVENT REPORT CONTROL BLOC <: l l

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60 61 DOCKET NUMBER 66 69 EVENT D ATE 74 75 REPORT 0 ATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o

2 lAt 1125 on 2/22/79, an Assistant Plant Operator discovered that the BlF sequencer was o

3 lin the test mode thereby rendering the 1-2A D/G inoperable.

(The BlF sequencer had l

lbeen tested satisfactorily on 2/21/79.) The 1B D/G was out of service for preventativq o

4 lmaintenanfe. Therefore, both ' sets o f D/G required by Tech. Spec. 3.8.1. lb were not l

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lavailable. Tech. Spec. 3.3.1.ld action statement requirements were met. 4he 1-2A l

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l D/G and 1B D/G were returned to an operable status at 1200 and 2212 respectively on l

ais l2/22/79. The health and safety of the general public were not affected.

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i o lThe BlF sequencer being in the test mode is attributable to a faultv switch mechanism l l1 lt l [which would allow the sequencer to change modes when the sequencer cabinet m s bumed. I lThe BlF sequencer was returned to normal and repairs were made to orevent it from I

l inadvertently going to the test mode.

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