ML19269C174

LER 78-064/03L-0 on 781222:comparator in 1A Main Steam Flow Instrumentation Channels Inoperable;Channel Bistables Tripped.Caused by Failure of Comparator

ML19269C174
Person / Time
Site:	Beaver Valley
Issue date:	01/22/1979
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19269C169	List: ML19269C167 ML19269C172 ML19269C173 ML19269C174
References
LER-78-064-03L, LER-78-64-3L, NUDOCS 7901290269
Download: ML19269C174 (1)

Text

4 NRC FORM 366 . U.S. NUCLEAR REGULATORY COwiMISSION 17.nl LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIREO INFORMATIONI CONTROL 8 LOCK: l I

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EVENT OATE 14 75 REPORT OATE 80 i E 60 61 DOCKET NUMSER EVENT DESCRIPTION ANO PROBA8LE CONSEGUENCES h o 2 lAt 2150 hours0.0249 days <br />0.597 hours <br />0.00355 weeks <br />8.18075e-4 months <br /> during performance of a surveillance test, a comparator in one of l 0 2 Ithe 1A Main Steam Flow instrumentation channels was discovered to be inoperable. I IT'ITl l The channel was declared inoperable and the channel bistables were trioOed at 2200 1 ITTTl hours. Redundant instrument channels were operable and the health and safety of f O 6 I the ceneral Dublic were not ieopardized. 1 IIIII I I O a l I SC5E YOO susCO$E CouPONENT CODE sus 50'E sus $E 7

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44 42 Yl@ 43 Nl@ l64W] 1l 2l 0l@ 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i O l The incident resulted from a failed comparator. The comparator was replaced and I w I the channel was calibrated and satisfactorily returned to service. I TTTT1I I l'TTilI l

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