ML19210E376

LER 79-035/03L-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

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: ML19210E373 ML19210E376
References
LER-79-035-03L, LER-79-35-3L, NUDOCS 7912040426
Download: ML19210E376 (1)

Text

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63 Gl DOCKET NUM3ER 74 FL iTDATE 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 10 l4 l [ exceed the limit specified in Technical Specifications Table 2.2-1. In accordance 1

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

[O lc l l required in modes 1 and 2, so the minimum trip setpoint aas immediately readiusted i

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44 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. _l lilai l _ l Iil4 I I l 7 8 9 83 STA S  % POWE R OTHER STATUS ISC RY DISCOVERY DESCRIPTION i s

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