ML19256A451

LER 78-100/03L-0 on 781209:rod-block Monitor Upscale & Downscale Instrument Functional Check Could Not Be Completed.Malfunction Disappeared & Could Not Be Duplicated

ML19256A451
Person / Time
Site:	FitzPatrick
Issue date:	01/03/1979
From:	W. Verne Childs POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19256A447	List: ML19256A445 ML19256A451
References
LER-78-100-03L, LER-78-100-3L, NUDOCS 7901080154
Download: ML19256A451 (2)

Text

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f ATTACH}IENT TO LER 78-100/03L-0 Page 1 of 1

[ During normal operation at approximately 19'. rated power, Operations Surveillance Test F-ST-5R titled RBM Upscale and Downscale Instrument Functional Check could not be satisfactorily completed on Rod Block Monitor (RBM) A. The test wac being conducted to allow a power increase above 30's of rated power.

The RBM system is not required to be operational at less than 30*6 of rated power and power was maintained less than 30'. of rated until the test could be completed with satisfactory results.

During trouble shooting to determine the source of failure, the malfunction disappeared and could not be duplicated. The instrument was tested with satisfactory results. On December 13 ar.. 14, 1978 an effort to duplicate the malfunction was again conducted without success. No other corrective action was taken.