ML19343C219

AO 50-219/75-32:on 751203,during Testing,Emergency Diesel Generator 1 Failed to Start When Simulated Loss of Power Condition Applied to Fast Start Logic Circuit.Caused by Failure of Relay to Operate Due to Varnish on Armature

ML19343C219
Person / Time
Site:	Oyster Creek
Issue date:	12/11/1975
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
AO-50-219-75-32, NUDOCS 8103020653
Download: ML19343C219 (1)

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. LICENSEE EVENT REPOP'.

CONTHOL BLOCX:l l l l l l l [pLEASE PRINT ALL REQUIRE]INF03:MATION 1 6 NANs '

tiCENsf NuvnE A Tv E TVPE

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7 89 l Nl Jl0lC lP l1l 14 l 0l 0l-l 0l 0l0 l 0 l 0l-l0 l 0] l4 l 1 l 1l 1l 0l l 0l ij 15 25 26 30 31 32 CAftGCEV fy 5u DOCm ET NUMBE A EVENT DATE REPOAT CATE oicoralPlDl C W l 015 l 01-10121119 l 11 l 2 l 013171 Sl 11 1211111715 7 8 57 SB SS 60 61 68 69 74 75 BC EVENT DESCAiDTION gg l During bi-monthly testing Emergency Diesel Generator No.1 failed to start when a i 7 89 b'

@l 7 89 simulated loss of power condition was applied to the Fast Start (automatic) logic ]

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l circuit. Emergency Diesel Generator No. 2 remained fully operable and No. I remainea')

e' BE I available for manual starting. The defective dead line relay was replaced. The fast ]

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@l 7 89 start test will be conducted monthly until operational reliability of the replacement Pnut bc C C L COMPONINT CODE A M duF A mem 7

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89 10 lR lE lL l Al Yl Xl 17 lN l lE I1 l6 l0 l [NJ 11 12 43 44 47 4e CAUSE DESCA;PTION

@l 7 89 An Electro-Motive Division Part No. 839823 relay for the Fast Start (automatic) logid 6'

gg l circuit failed to operate due to varnish on the relay armature. Varnish prevented thj 7 89 pg gl contacts from opening as required during the fast start operation. The relay was l 7 8* ea F.9P.l a ced. ,,, g c, status  % FOWE A OTHEA STATUS DiSCOVE AY DGCOVEAY OESCAEPION

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7 8 9

[E_j 10 l0l6l0l l NA l [BJ l NA l 12 13 44 45 46 80 RE L E A S E D OF tLE SE AMOUNT OF ACitVITY LOCATON Pr PELE1*J Eli lZ l l NA l NA

[Z_J l l 7 8 9 to 11 44 45 eg PEASONNEL EXPOSUAES NUVDFu YvrE DE SCA>P T ON i l O! 0101 LZ_J l NA l 7 89 11 12 13 80 PERSONNEL INJUA;ES NUV0F A GE SC A:PtON 1

1010101 l NA l

7 89 11 12 80 oFFSITE COf. SEQUENCES Hl NA l 7 89 eg LOSS OR DA*AAGE TO FACILITY TvPE DESCEP!CN 8 L2J 7 89 10 l NA I 80 PUBLICITY

@l 7 89 NA l 80

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ADDITIONAL FACTOAS

@ l Event Description (con't) relay can be established. Investigation for determing the l 7 89 83 g l exact cause is.still underway (A0 No.50 219/75-32). _

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NAME 201-539-6111 geo w a. - - 3 PICP:E. -

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