ML19242D658

LER 79-055/03L-0 on 790714:reactor Core Isolation Cooling Turbine Tripped in Overspeed Before Reaching Rated Speed. Caused by Failure in Electrohydraulic Actuator & Transistor in Control Unit,Due to Moisture.Parts Replaced

ML19242D658
Person / Time
Site:	Brunswick
Issue date:	08/10/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19242D655	List: ML19242D654 ML19242D658
References
LER-79-055-03L, LER-79-55-3L, NUDOCS 7908150680
Download: ML19242D658 (2)

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60 61 DOCK ET NUYBER 6d EV ENT D ATE 74 AEPORT D ATE EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h o 2 lWhile performing PT 10.1.la. RCIC Component Test. the RCIC Turbine tripped an over- 1 o a lspeed before reaching rated speed. I o J ITechnien1 9poci f f ent-i nn 1.7_4. 6_Q_1_9b I oin l I O 6 l l

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47 CAUSE CESCRIPTION AND CCRRECTIVE ACTIONS h 1 l -) lA failure in the EGR electro-hydraulic actuator and a transistor (n the EGM control I 1 '

lunit caused the turbine to trf.p. below its trip setnoint. Moisture in rho rGP ,c~wn* I i

lhead caused insulation failure of the coil in the ac tuai.or. causine excessive currents I i 1' lthrough the transistor in the ECM unit. The actuator and the transistor were replaced.]

la lthe unit was calibrated and PT 10.1.la was successfully completed. (Con't) I

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LER CONTINUATION -- RO# 2-79-55 Facility: BSEP Unit No. 2 Event Date: 7-14-79 Both IIPCI units and the other RCIC unit were inspected with no problems found.

This is considered an isolated event with no further action required.

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