ML20004C619

LER 81-019/03L-0:on 810313,during Normal operation,RC3,RC6 & RB3 Relays Tripped in Emergency Safeguards Actuation Channel B.Cause Attributed to Failed Hamlin Relay.Maint Revealed Addl Faulty Relays.Hamlin Replaced W/Cryden Relays

ML20004C619
Person / Time
Site:	Crystal River
Issue date:	04/10/1981
From:	Bufe J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20004C617	List: ML20004C616 ML20004C619
References
LER-81-019-03L, LER-81-19-3L, NUDOCS 8106040340
Download: ML20004C619 (2)

Text

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The relays failed as a result of the initial relay failure and were replaced. ,

, , , , , , Operability was restored at 1315 on 3/14/81. A modification will be completed by ,

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Jo SUPPLEMENTARY INFORMATION REPORT NO.: 50-302/81-019/03L-0 FACILITY: Crystal-River Unit #3 REPORTdhTE: April 10,1981 OCCURREN'CE DATE: 13 March 1981 IDENTIFICATION OF OCCURRENCE: Failure of the Engineered Safety Feature Actuation System Instrumentation Channel contrary to Technical Specification 3.3.2.1.

. CONDITIONS PRIOR TO

'0CCURRENCE: Mode 1 power operation (100%)

DESCRIPTION OF OCCURRENCE: At 2015 during normal operations RC3, RC6 and RB3 relays-tripped in ES Actuation Channel B. Emergency safeguards did not actuate. Maintenance was initiated. Operability was restored at 1315 on March 14, 1981 after satisfactory completion of SP-130, Engine'ered Safeguards Monthly Func-tional Test.

DESIGNATION OF ,

APPARENT CAUSE: The cause of this event is attributed to a failed Hamlin relay.

ANALYSIS OF OCCURRENCE: There was no effect upon the health or safety of the gen-eral public.

CORRECTIVE ACTION: Hamlin relay model 723-12-740 was replaced with a Crydon model A-2410. Post maintenance testing was conducted which indicated additional problems. Further troubleshooting revealed the failure of two (2) additional relays. The relays were replaced and the failure of the relays nas con-sidered to be a result of the initial failed relay. A modification package (MAR 80-11-74) has been developed and ,

is being implemented to change from Hamlin relays Model i 723-12-740 to Crydon relays Model A-2410 no later than the I next refueling outage.

FAILURL DATA: This is the seventh occurrence concerning ES cabinet relays I g andtheeighteentheventreportedunderthisSp)cification.