05000259/LER-1982-069-03, /03L-0:on 820907,during Startup Testing,Rod Sequence Control Sys Found Inoperable.Caused by Failure of GE Sequence Generator Card Model 195B948GAA.Card Replaced & Testing Satisfactorily Completed

/03L-0:on 820907,during Startup Testing,Rod Sequence Control Sys Found Inoperable.Caused by Failure of GE Sequence Generator Card Model 195B948GAA.Card Replaced & Testing Satisfactorily Completed

ML20027C194
Person / Time
Site:	Browns Ferry
Issue date:	10/05/1982
From:	Irby B TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20027C190	List: 05000259/LER-1982-069, Forwards LER 82-069/03L-0 05000259/LER-1982-069-03, /03L-0:on 820907,during Startup Testing,Rod Sequence Control Sys Found Inoperable.Caused by Failure of GE Sequence Generator Card Model 195B948GAA.Card Replaced & Testing Satisfactorily Completed
References
LER-82-069-03L-01, LER-82-69-3L-1, NUDOCS 8210130569
Download: ML20027C194 (2)

LER-1982-069, /03L-0:on 820907,during Startup Testing,Rod Sequence Control Sys Found Inoperable.Caused by Failure of GE Sequence Generator Card Model 195B948GAA.Card Replaced & Testing Satisfactorily Completed

Event date:
Report date:
2591982069R03 - NRC Website

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Tennsssee Valley Authority' Form BF 17 Browns Ferry Nucicar Plant BF 15.2 2/19/82 LER SUPPLEMENTAL INFORMATION BFRO-50 259 / 82069 Technical Specification Involved 3.3.B.3.a Reported Under Technical Specification 6.7.2.b.(2h Date Duc NP.C 10/07/82

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Event Narrative:

Unit 1 was in a forced outage, unit 2 in a refueling outage, and unit 3 operating normally at 98-percent power. Unit 1 was the only unit affected by this event.

During startup testing, the r'od,* sequence control system (RSCS) failed its functional test, Surveillance Instruction (SI) 4.3.B.3-a.

Prior to control rod r-j withdrawal for startup, the ability' of the RSCS to fulfill its function is verified by selecting a RSCS sequence and attempting to withdraw a control not in the selected sequence. 'Ihe RSCS, if functioning correctly, 'will prohibit out-of-sequence control rod withdrawal.In this event the RSCS did not prohibit the partial withdrawal of the out-of-sequence control rod. The control rod was o

reinserted and startup suspended (Technical Specification 3 3.B'.3.d).

Cause of the event was determined to be a failed General Electric sequence generator card, rrodel number 195B948GAA. The failed card was replaced and SI 4 3.B.3-a was

atisfactorily completed. The RSCS was out of service for four hours. There was l

no effect on public health and safety. All control rods were inserted following.

the trial control rod withdrawal and the unit was shut down.

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• Previous Similar Events:

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BFRO-50-259/74020W, 78021 t^

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criod - Lifetime; Responsibility - Document Control Supervisor

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