05000336/LER-1979-035-03, /03L-0:on 791102,reactor Protection Sys,Channel a High Power Level Min Trip Setpoint Exceeded Tech Spec Limit. Caused by Instrument Drift.Setpoint Potentiometer Was Readjusted & Min High Power Trip Setpoint Restored to Spec

/03L-0:on 791102,reactor Protection Sys,Channel a High Power Level Min Trip Setpoint Exceeded Tech Spec Limit. Caused by Instrument Drift.Setpoint Potentiometer Was Readjusted & Min High Power Trip Setpoint Restored to Spec

ML19210E376
Person / Time
Site:	Millstone
Issue date:	11/28/1979
From:	Bates R NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19210E374	List: 05000336/LER-1979-035, Forwards LER 79-035/03L-0 05000336/LER-1979-035-03, /03L-0:on 791102,reactor Protection Sys,Channel a High Power Level Min Trip Setpoint Exceeded Tech Spec Limit. Caused by Instrument Drift.Setpoint Potentiometer Was Readjusted & Min High Power Trip Setpoint Restored to Spec
References
LER-79-035-03L, LER-79-35-3L, NUDOCS 7912040426
Download: ML19210E376 (1)

LER-1979-035, /03L-0:on 791102,reactor Protection Sys,Channel a High Power Level Min Trip Setpoint Exceeded Tech Spec Limit. Caused by Instrument Drift.Setpoint Potentiometer Was Readjusted & Min High Power Trip Setpoint Restored to Spec

Event date:
Report date:
3361979035R03 - NRC Website

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FiE FL iTDATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h [O 12l l During routine surveillance testino while in cold shutdown (modo O. the Reactor l

10 l3 l l Protection System, Channel A high power level minimum trip setpoint was found to I

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[O [s; l with Section 3.3.1.1, Table 3.3-1, Item 2, an operable power level high trip is 1

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l and the Channel A high power trip was restored to operable status.

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40 41 42 43 44 47 CAUSE DESCnlPTION AND COnRECTIVE ACTIONS h li l0 l l The setpoint exceeded its specified lim t of 159' of rated thormal nower dun tn I

li li l l instrument drif t.

The setpoint potentiometer was readius$nd and thn minirn, I

i 2 I high power trip setooint was restored to its specified value.

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