ML20054L976

LER82-054/03L-0:on 820607,reactor Core Isolation Cooling Sys Turbine Automatically Started on Reactor Low Level,But Tripped Due to Closure of Control Valve 1-E51-V9.Caused by Lack of Turbine Speed Demand Signal Due to Governor Failure

ML20054L976
Person / Time
Site:	Brunswick
Issue date:	06/29/1982
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20054L965	List: 05000325/LER-1982-054, Forwards LER 82-054/03L-0 ML20054L976
References
LER-82-054-03L-01, LER-82-54-3L-1, NUDOCS 8207090118
Download: ML20054L976 (2)

Text

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EVENT DESCnlPTION AND PROBABLE CONSEQUENCES h Io17l l Following a reactor scram, the RCIC System turbine automatically started on reactor l loja; l low level but immediately tripped due to the immediate closure of the RCIC turbine l 1014 l l control valve, 1-E51-V9. The HPCI System was utilized to restore and maintain l jols; l normal reactor Icvel. This event did not af fect the health and saf ety of the public. l 10 Kl l l J

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lois 1 I Technical Specification 3.7.4. 6.9.1.96 1 7 8 9 80 SYSTEM CAUSE CAUSE COY P. VALVE CODE CODE SUBCODE COMPONENT CODE SUSCODE SUBCODE lolol l Cl Ej@ W@ W@ lI lN lS lT lR lU_j@ l Cl@ W @ 20 7 8 9 to 11 12 13 18 19

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i l i I 0 I I V9 closed due to lack of a turbine speed demand sinnal as the result of the failure l ITTTI I of the RCIC ECM and ECR units. This was caused bv contact of an ECR input lead l IiI7I l amphenol connector ground wire with the connector output terminals. The connector l ltlal l was repaired, the ECM and EGR were replaced and calibrated, and the RCIC System was l 3l tested 7 8 9 and returned to service. 80 1

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LER ATTACHMENT - RO #1=82-54 Facility: BSEP Unit No. 1 Event Date: 6/7/82 Following a reactor scram, the RCIC and HPCI Systems automatically started on low reactor water level. However, the RCIC System immediately tripped due to the RCIC turbine control valve, 1-E51-V9, closing.

An investigation of this event revealed the RCIC System electronic governor module (EGM), which controls hydraulic pressure to V9 by controlling the RCIC i electrohydraulic governoring regulator (EGR), did not produce a RCIC turbine

speed increase demand output signal. An electrical inspe cion of the EGR i wiring determined that the ground wire had come loose froa the amphenol plug l housing and had apparently contacted one of the electrical connections. This caused damage to the EGM unit output section and resulted in an overvoltage condition to the EGR unit actuator coil causing its failure.

l The subject amphenol connector, Woodward Controls Model No. 203911, was j repaired by clipping back the ground wire and wrapping it against the cable sheath using electrical insulation tape. The damaged EGM, Model No. 9903-016, and EGR, Model No. A8250-133, were replaced and calibrated. The RCIC' System l was then tested and returned to service.  ;

The investigation of this event could not determine the mechanism by which the

subject ground wire was caused to make electrical contact with the EGR input connector terminals. Furthermore, it is suspected the wire had been in its i discovered configuracion since initial installation.

! As a result of this event, the EGM to EGR unit's wiring of the Unit No. 2 RCIC System will be inspected for a possible similar condition and will be corrected as required to prevent a similar event. In addition, the turbine control instrumentation wiring on the HPCI Systems of both units will be inspected and corrected as required to likewise prevent any future similar

! event. As this event is the first such occurrence, it is falt the corrective

actions in response to it are appropriate and do not require further

! development.

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