ML20085M435

Telecopy AO 76/005:on 760227,loss of Essential 480-volt Bus 2 Caused Trip of Three Helium Circulators Due to Circulator Bearing Water Problems.Loss of 480-volt Bus Could Cause Temporary Loss of Forced Circulation

ML20085M435
Person / Time
Site:	Fort Saint Vrain
Issue date:	02/17/1976
From:	Hillyard H PUBLIC SERVICE CO. OF COLORADO
To:	Howard E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20085M429	List: 05000267/LER-1976-005, LER 76/005:on 760207,during Cold Shutdown,Essential 480-volt Bus 2 Tripped,Causing Trip of Three Circulators.Caused by Electrician Carelessness.Electricians Reminded to Be More Careful ML20085M435
References
AO-76-005, AO-76-5, NUDOCS 8311080573
Download: ML20085M435 (1)

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f kV INF0M ASTER PUB SFR CO DN 0316 PPA 048 1735FS1 003 DFNVFR COLORADO FEPFUARY 17 ZIP 76012 E MORRIS HOWARD RF.GION I Vs REGULATORY OPERATION NUCLEAR RFGULATORY COMMISSION 611 RYAN PLAZA DR, SUITE 1000 ARLIN GTON, TFXAS 76012 2776, LOSS OF FSSENTI AL 480 BOLT RUS NO. 2 CAUSED A TRIP OF THREE HELIUM CIRCULATORS DUE TO CIRCULATOR PEARING HATER PROPLEMS.

SUPSFOUFNT ANALYSIS COMPLETFD ON 2-13-76 INDICATES THAT LOSS OF ONE i

ES3FNTI AL 480 VOLT PUS DURING POWER OPERATION COULD POTENTI ALLY CAUSC A TEMPORARY LOSS OF FORCED CIRCULATION.

TH I S PRO EL EM H AS BEEN IDENTI FIED AS AFNORMAL OCCURRENCE 76/05 PER FORT ST. VRAIN TECHNICAL SPECI FI CATI ON S, SECTION P.1, PAR.

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i H. W. HILLY ARD, JR.

FORT ST. VRAIN NUCLEAR GENERATING STATION

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PUPLIC SERVICF COMPANY OF COLORADO 550 FIFTEENTH STREET, D EN V ER, COLO 80202 1

ACCFeTED

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