05000220/LER-1980-033, Forwards LER 80-033/03L-0

Forwards LER 80-033/03L-0

ML17053C297
Person / Time
Site:	Nine Mile Point
Issue date:	01/23/1981
From:	Lempges T NIAGARA MOHAWK POWER CORP.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML17053C298	List: 05000220/LER-1980-033, Forwards LER 80-033/03L-0 05000220/LER-1980-033-03, /03L-0:on 801224,auxiliary Power Feed Experienced Loss to Emergency Power Bus.Caused by Feeder Breaker Trip Due to Setpoint on Over Frequency Protective Relay Being Set Too Close to Nominal Frequency.Relay Recalibr
References
NMP-2841, NUDOCS 8102100622
Download: ML17053C297 (2)

LER-1980-033, Forwards LER 80-033/03L-0

Event date:
Report date:
2201980033R00 - NRC Website

text

i,I T NIASAPA

~34 LI MQIIAWK NINE MILE POINT NUCLEAR STATION /P 0 BOX 32 LYCOiAING,NEW YORK 13093 /TELEPHONE (315) 343 21 10 Janua/I,y 23, 1981 htx. Boyce H. G/Iie/I,, Nrce&oe UnMed S~u Nues~ Regulatory CommQbmn - Region T

631 Pa/I.fz Avenue G.ng o( P/t.u5sia, Penwylvarua 19406 RE:

Sock& No.

50-220 LER 80-33 gem h(/I,. G/Ii,e/L:

Tn acco/cdance N~ Nine, NZe Pet Nuclevt SM~n Ueu'1 Tech'.c&

Speci.+~ac,.

Ive he/I.eby aub~ Che fo&oieuig Licensee Ev~ RepoM:

80-93 wM.ch i/I being sub~ed in accordance teil&

Se~n 6.9.2b2, Con~ne Leaching Co Opetca-

~n in a, gegrutded ilfode Pete~ed by Lining Condition )o< Ope/upon Se~on 3.6.3b

.conceruu,ng Emergency Pore/I. Sou/I,cd.

TRQ /I,epos MIae compZ&edLn Che (o/vIIat designated in NUREG-0161, de".ed JuLy 1977.

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LICENSEE CODE 25 26 LICENSF TYPE 30 57 CAT SS Q

14 75 LICEBISE NUhlBER I

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Qs 60 6'I DOCK cT iVUMBER 68 69 FVENT OATc 74 75 REPORT DATE BP EVENT OESCRIPTIQN ANO PROBABLE CONSEQUENCES 10 During normal operation, the loss of a 115'uxiliar poli'er feed to an emergency porier bus was experienced.

The Emergency Diesel Generator automatically came into service as required.

This had no adverse affect on safe operation since these components operated as designed.

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80 SYSTEM CAUSc

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0 33 34 35 36 37 4p 41 42 43 44 CAUSE OESCRIPTIQN ANO CORRECTIVE ACTIONS 27 o

A calibration check of the over-fre uenc rotective rela for the feeder breaker

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8 47 revealed that the trip setpoint was found too conservativel close to the nominal frequency, thus causing a spurious trip of the breaker.

The relay was properly recalibrated to prevent recurrence Thi.s type of relay will be calibrated on refuel cycle frequency for future preventative action.

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FACILITY

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'Ip 12 13 44 45 ACTIVITY CONTENT RELEASED OF RELEASc AMOUNTOF ACTIVITY 3

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10 44 45 PERSQiVNEI EXPOSURES NUMBER TYPE OFSCRIPTION

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11 12 13 PERSOiVNEL INJURIES NUMBER QESCRIPTIOiV s ~00 0

Qio N/A DISCOVERY DESCRIPTION Event troubleshootin 80 LOCATIONOF RELEASE N/A 80 80 80 7

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11 12 LOSS OF OR DAMAGETO FACILITY 43 TYP E

DESCRIPTION

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N/A 68 69 80:

PHQNE 315-343-2110 ext.

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