ML19290E184

LER 80-009/03L-0:on 800201,during Loss of Offsite Power Surveillance Test,Output Breaker for Diesel Generator 1B Failed to Auto Close.Caused by Misaligned Mechanism Operated Contact Switch.Switch Realigned

ML19290E184
Person / Time
Site:	Farley
Issue date:	02/29/1980
From:	Hairston W ALABAMA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19290E176	List: ML19290E175 ML19290E177 ML19290E184 ML19290E192 ML19290E197 ML19290E198 ML19290E201 ML19290E202
References
LER-80-009-03L, LER-80-9-3L, NUDOCS 8003050026
Download: ML19290E184 (2)

Text

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oATE 14 Ts REPOs r oATE sa a a 6a u ., . a r r. . e EVENT DESCRIPTION AA.D PROSAS.I CO*.mO.JINC*E3

o l2 l l At 1732 on 2/1/80, during the performance of a " Loss of Of f-Site Power" Surveillance  ;

7g g Test, the output breaker for D/G IB (DG08) failed to auto close. As a result D/G 1B g q gwas declared inoperable. Tech. Spec. 3.8.1.b requires two separate and independent g r ] ,; diesel generator sets to be operable. Tech. Spec. 3.8.1.1.aactionstatementsweremeg.

,] l D/G IB was restored to operable status at 0020 on 2/2/80. A similar occurrence was  ;

- ] [ reported on LER 78-055. The health and safety of the general public were not affected g MI I SYSTE.'a CAJ53 03 ul:E CC' ' P. VALVE CODE CO S SUSC.70E CL'"A*0NENT CODE SuaCODE SUSCOOE IU,T l E I g } @ W@ !!

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, 3420U9lT1AL OCCURRENCE REFORT REVISloM LER EVENT YE AR Wi"OWT N'3. CODE TYPE No.

@ gg.g>RO18 10 l L-1 to 10 19 .! ul 10131 It I l-1 101 w21 22 2.:. 24 a's 23 23 29 J 31 52 ACTION FUTURE E FFEC Tr'VDCV.l- A'T AC At ENT NPRO-4 F"ie.*E CO?.!P. COP.tPO ::NT TAKEN AC T I O *4 ON7tN47 *5740 - e40VGS $'.,3ViT T i3 FORM auts. EUP7 LIE 4 MA.NUFACTURE9 b@lX l@ Q l_ _Z l'.{ j0I O!0 0l WQ lNl@ [Aj@ l A i 1 l 8 l 0 lg 33 J4 e) . c, J;, da 48

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42 43 44 4; CAUSE DESCRIPTION ANO COrMECTIVE ACTOTLi>'T!

!a o lThe Mechanism Onerated contact NOC) switch located in the sunply breaker for 4160V i M l Bus 1G f rom IB Startup Transformer (DG15) was found to be misalinned, causing a normally

, g l closed contact to stay open when the breaker was opened. The affected contacts in thet

. :3 3 lMOC switch in DG-15 are part of the auto-close circuit for D/G IB tie breaker to Bus l y { IG (DG08). The MOC switch was realigned and auto-close of DG08 was verified when [

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• DisCaVER Y DtW"OVf NY DESCRIPTION

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W. G. Hairston, III (205) 899-5156 o 5

MAME OF PRtrAAE7 PHONE- "

8003050) y. . . . - . - -.-. -

LER 80-009/03L-0 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (Continued) off-site power was removed from 4160 Bus 1C (DG01 and DG15 tripped open).

An engineering evaluation will be made to further investigate the cause of misalignment.

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