ML20039C292

LER 81-014/03L-0:on 811125,channel B flux-imbalance Flow Bistable Found to Trip Outside Tech Spec Limit.Caused by non-linear Gain on Reactor Protection Sys Channel B Scaled delta-flux Amplifier.Amplifier Replaced

ML20039C292
Person / Time
Site:	Oconee
Issue date:	12/21/1981
From:	Kutzer J DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20039C288	List: ML20039C287 ML20039C292
References
LER-81-014-03L-01, LER-81-14-3L-1, NUDOCS 8112290186
Download: ML20039C292 (1)

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l 1,8 , irg EVENT EscaimCM ANC p.csasu Oc.ustct;ENcts i3,2, p On November 25, 1981 during perf mance of RPS on-line tests, the Channel "B"

1. 2,2 t Flux Imbalance-Flow Bistable was found to trip outside the Technical Specift 7 is .. I n ., 4 n ., 14 <e 4 ., re u e~,-r ~ e n vn tive Grec tinn . The redundant channels wqre I o .3!I operable during this incident. Thus, thehepthandsafetyofthepubl"cwere,

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tt .at ! The annarent cause of this incident was a module failure causing non-linear ,

,, ,,,; gain on the RPS Channel "B" Scaled Delta-Flux Amplifier. The amplifier was ,

replaced, calibrated and satisfactorily tested.

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i e , a a se ,a asaus es ege7AAEM J. F. Kutzer 704-373-7139 8112290186 811221 PDR ADOCK 05000287 S PDR

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