05000325/LER-1979-089-03, /03L-0:on 791120,reactor Core Isolation Cooling Turbine Tripped on Mechanical Overspeed During Scram.Caused by Crack in Amphenol Connector to Tachometer Pickup. Connector Replaced

/03L-0:on 791120,reactor Core Isolation Cooling Turbine Tripped on Mechanical Overspeed During Scram.Caused by Crack in Amphenol Connector to Tachometer Pickup. Connector Replaced

ML19256G046
Person / Time
Site:	Brunswick
Issue date:	12/17/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19256G045	List: 05000325/LER-1979-089, Forwards LER 79-089/03L-0 05000325/LER-1979-089-03, /03L-0:on 791120,reactor Core Isolation Cooling Turbine Tripped on Mechanical Overspeed During Scram.Caused by Crack in Amphenol Connector to Tachometer Pickup. Connector Replaced
References
LER-79-089-03L-01, LER-79-89-3L-1, NUDOCS 7912270317
Download: ML19256G046 (2)

LER-1979-089, /03L-0:on 791120,reactor Core Isolation Cooling Turbine Tripped on Mechanical Overspeed During Scram.Caused by Crack in Amphenol Connector to Tachometer Pickup. Connector Replaced

Event date:
Report date:
3251979089R03 - NRC Website

text

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8 60 61 COCK ET NUveER tw 69 EVENT OATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h the RCIC turbine tripped on mechanical overspeed following l o

2 IFollowira a reactor scram, tan automatic initiation signal at -38 inches. The HPCI turbine van under clearance _

oia o a Iat this time for maintenance. RCIC was reset and manuallv 91 aced into oneration.

I 1 Vessel level reached a low of -40 inches.

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O IThe e,rm e.n n -espe i n c,1 1,.

,na er,--nacm-1,.n1 c e n *,. e 1 When the tu'rbine was l-secured. an investigation revealed a crack in the amphenol connector to the tache-eter i

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2 l pickup causing a loose connection. The connector was replaced and the clearance on I

i 3 lthe meenetic oickuo was reset to insure a proper fit.

RCIC turbine speed control was j1 i

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LER CONTINUATION 79-89 FACILITY: BSEP Unit Nc. 1 EVENT DATE:

11-20-79 tested satisfactorily at 100 psig and 1000 psig reactor pressure during the subsequent start-up.

The Unit 2 RCIC connection was checked and found satisfactory.

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