ML19312C904

LER-78-004/01T-0:on 780323,review of Power & Heat Indicatios Revealed That on 4 Occasions Instrumentation Found Out of Calibr.Caused by Error Exceeding Assumed Max Valve Before Completion of Recalibr

ML19312C904
Person / Time
Site:	Oconee
Issue date:	04/17/1978
From:	Ken Wilson DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19312C903	List: ML19312C902 ML19312C904
References
LER-78-004-01T-01, LER-78-4-1T-1, NUDOCS 8001130239
Download: ML19312C904 (1)

Text

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I 8 to .. cocitgyguusgn EVENT DEsCatFTicN AND PPc3 A.LE CCNsECUENCES h g t o lil l On tiarch 23, 1978 after a review of pertinent data regard'ng N1 power l

t o 121 I indications vs. heat balance indications, it was determined that on 4 h j 1014] I occasions the NI-indication was less than the thermal valves by more t an Since addi- l o s 1 4% which exceeded the maximum difference assumed in the FSAR.

f actored into safety analyses and since other para g lo is ) I tional conservatisms are o , I meters are also monitored with suitabic trip logic there were no adverse ,

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i o l The control circuitry must be recalibrated during periods of power 1cvel ,

On these i li lil I channe and such recalibrations are provided for in procedures.

j i l occasions, before recalibration was completed, the error exceeded the Additional procedural conservatisms (see attached) g (T]B I assumed maximum value.

j ti ta i l- shpuld_orevent recurrence in tre future.

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