05000333/LER-1979-117-03, /03L-0:on 791227,during Preparation for Reactor Startup,Average Power Range Monitor Channel D Scram Trip Setpoint Was Found Set at 23%,compared to Tech Spec Limit of 15%.Caused by Instrument Drift of 15% Trip Point

/03L-0:on 791227,during Preparation for Reactor Startup,Average Power Range Monitor Channel D Scram Trip Setpoint Was Found Set at 23%,compared to Tech Spec Limit of 15%.Caused by Instrument Drift of 15% Trip Point

ML19262C023
Person / Time
Site:	FitzPatrick
Issue date:	01/17/1980
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
ML19262C022	List: 05000333/LER-1979-117, Forwards LER 79-117/03L-0 05000333/LER-1979-117-03, /03L-0:on 791227,during Preparation for Reactor Startup,Average Power Range Monitor Channel D Scram Trip Setpoint Was Found Set at 23%,compared to Tech Spec Limit of 15%.Caused by Instrument Drift of 15% Trip Point
References
LER-79-117-03L, LER-79-117-3L, NUDOCS 8001220469
Download: ML19262C023 (2)

LER-1979-117, /03L-0:on 791227,during Preparation for Reactor Startup,Average Power Range Monitor Channel D Scram Trip Setpoint Was Found Set at 23%,compared to Tech Spec Limit of 15%.Caused by Instrument Drift of 15% Trip Point

Event date:
Report date:
3331979117R03 - NRC Website

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JAMES A. FITZPATRICK NUCLEAR POWER PLANT DOCKET NO. 50-333 ATTACHMENT TO LER 79-117/03L-0 Page 1 of 1 During preparation for reactor startup and while conducting Operations Surveillance Test F-ST-5N titled "APRM High Flux in Shutdown, Startup or Refuel Functional Test," APRM Channel D scram trip point was found set at 23% compared to a Technical Specification Appendix A, Table 3.1-1 limit of equal to or less than 15%. The remaining five (5) APRM channels were veri-fled to be set within the Technical Specification limits therefore the event did not represent any significant hazard to the public health and safety.

The improper set point is believed to be due to instrument drift of the 15% trip point.

Recalibration of the instrument restored it to operable status the same day.