05000333/LER-1979-104-03, /03L-0:on 791110,during Instrument Surveillance Procedure F-ISP-72,source Range Monitor a Exhibited Erratic Operation.Cause Unknown.During Troubleshooting,Instrument Operation Returned to Normal

/03L-0:on 791110,during Instrument Surveillance Procedure F-ISP-72,source Range Monitor a Exhibited Erratic Operation.Cause Unknown.During Troubleshooting,Instrument Operation Returned to Normal

ML19291B955
Person / Time
Site:	FitzPatrick
Issue date:	12/10/1979
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
ML19291B950	List: 05000333/LER-1979-104, Forwards LER 79-104/03L-0 05000333/LER-1979-104-03, /03L-0:on 791110,during Instrument Surveillance Procedure F-ISP-72,source Range Monitor a Exhibited Erratic Operation.Cause Unknown.During Troubleshooting,Instrument Operation Returned to Normal
References
LER-79-104-03L, LER-79-104-3L, NUDOCS 7912140449
Download: ML19291B955 (2)

LER-1979-104, /03L-0:on 791110,during Instrument Surveillance Procedure F-ISP-72,source Range Monitor a Exhibited Erratic Operation.Cause Unknown.During Troubleshooting,Instrument Operation Returned to Normal

Event date:
Report date:
3331979104R03 - NRC Website

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POWER AUTHORITY OF THE STATE OF NEW YORK JAMES A. FITZPATRICK NUCLEAR POWER PLANT DOCKET NO. 50-333 ATTACHMENT TO LER 79-104/03L-0 Page 1 of 1 During normal operation, while conducting instrument surveillance procedure F-ISP-72, titled "SRM Upscale, Downscale Calibration" to satisfy the requirements of Technical Specifications, Appendix A, Table 4.2-3, SRM A exhibited erratic operation.

The SRM instrumentation was not required to be operable as the reactor was operating at approximately 50% of rated power.

However, preparations were being made for a possible shutdown which required the calibration of the instrumentation. The other three SRM channels were found fully operable.

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

During the trouble shooting to locate the source of the erratic operation, instrument operation returned to normal. A number of attempts to recreate or reestablish the erratic operation in addition to exhaustive trouble shooting of the instrument channel could not produce additional erratic operation nor could any cause for the earlier erratic operation be determined.

Following this exhaustive trouble shooting and monitoring, which continued for several days, the instrument was returned to service in a fully operable condition.

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