05000333/LER-1979-078-03, /03L-0:on 791002,reactor Water Instrument 02-3-LIS-72A Was Found Out of Calibr.Caused by Instrument Drift Due to Unknown Causes.Surveillance Increased to Daily Until Switch Is Replaced or Determined Reliable

/03L-0:on 791002,reactor Water Instrument 02-3-LIS-72A Was Found Out of Calibr.Caused by Instrument Drift Due to Unknown Causes.Surveillance Increased to Daily Until Switch Is Replaced or Determined Reliable

ML19254E763
Person / Time
Site:	FitzPatrick
Issue date:	10/30/1979
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
ML19254E757	List: 05000333/LER-1979-078, Forwards LER 79-078/03L-0 05000333/LER-1979-078-03, /03L-0:on 791002,reactor Water Instrument 02-3-LIS-72A Was Found Out of Calibr.Caused by Instrument Drift Due to Unknown Causes.Surveillance Increased to Daily Until Switch Is Replaced or Determined Reliable
References
LER-79-078-03L, LER-79-78-3L, NUDOCS 7911020300
Download: ML19254E763 (2)

LER-1979-078, /03L-0:on 791002,reactor Water Instrument 02-3-LIS-72A Was Found Out of Calibr.Caused by Instrument Drift Due to Unknown Causes.Surveillance Increased to Daily Until Switch Is Replaced or Determined Reliable

Event date:
Report date:
3331979078R03 - NRC Website

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POWER AUTHORITY OF THE STATE OF NEW YORK JAMES A. FITZPATRICK NUCLEAR POWER PLANT DOCKET N0. 50-333 ATTACHMENT TO LER 79-078/03L-0 Page 1 of 1 During normal operation and while performing Instrument Surveillance Procedure F-ISP-3-2. titled " Reactor Low Low / Low Low Low Water Level,"

reactor water level instrument 02-3-LIS-72A was found out of calibration in the non-conservative direction. This surveillance was being conducted to satisfy the requirements of Technical Specifications, Appendix A, Table 3.2-2 and the switch was found set at approximately 60 inches com-pared to a Technical Specification requirement of equal to or greater than -38 inches.

The other three switches associated with the same parameter were immediately verified operable and within calibration and the out of calibration level switch was placed in the trip condition.

Therefore, the event did not represent a significant hazard to the public health and safety.

Surveillance tests conducted on this instrument are normally performed on a monthly basis.

Since the precise cause of the instrument drift is not known, a surveillance frequency has been increased to daily until the switch may be replaced or until the results of surveillance demonstrate that the instrument is stable and reliable. When this determination has been made, a followup report will be submitted.

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