ML19309H263

LER 80-016/03L-0:on 800403,during Surveillance Testing, Reactor Protection Sys Channel a Low Steam Generator Pressure Bypass Removable Bistable Card Setpoint Was Found Out of Spec.Caused by Instrument Setpoint Drift

ML19309H263
Person / Time
Site:	Millstone
Issue date:	05/01/1980
From:	Bates R NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19309H262	List: ML19309H261 ML19309H263
References
LER-80-016-03L, LER-80-16-3L, NUDOCS 8005090456
Download: ML19309H263 (1)

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@ [ During routine surveillance the Reactor Protection System Channel A Low Steam Generator I g Pressure Bypass removal bistable card setpoint was found to be out of specifications, I g [ calling for automatic bypass renoval at 609 psia vice less than 600 psia. The bistableI i

g l card setpoint was immediately adjusted in accordance with Technical Specifications I g [ Section 2.2.1, Table 2.2-1, item 6, note 2 and operation continued. There are no con- l g l sequences of this event because the setpoint was found to be correct in the previous I g

monthly check and since that time there were no operations requiring bistable functionire 8 9 UtO'-tPj pa n rtrova i j . 83 C DE CODE SUCCO E COMPONENT CODE SU C dE SU ODE d o_1 111 A l@ {Bj@ l A l@ II IN IS IT lR IUIS l@ LXJ@ [2j @ 19 20 8 9 10 11 12 13 SEQUE NTI AL OCCURRENCE REPORT REVISION EVENT YEAR REPORT NO. CODE TYPC N O.

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43 lY 42 l@ [N 43 l@ lG 44 l31015l@ 47 d5 3G CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i- l 0 l l The cause of the high setpoint was instrument setpoint drif t caused by hiah sensitivity I i li j l to changes in input resistance, a condition that will be resolved by the future nlannori I

, ,,, l replacemer.t of the auctioneered input bistable trip units. The bistable card is a Gulf I 7Til l eneral G Atomic, part ELD-134-1170, flodel NT-4. Previous occurrence: 1 i [4 i l LER 75-36,12/14/75. I 8 9 80 STA S  % POWE R OTHER STATUS DISC RY OtSCOVERY DESCRIPTION i I 5 l y@ l1 l0 l0 lgl NA l l B j@l Surveillance Testing l

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R. W. Bates PHONE:

203-447-1791 ",

NAME OF PntPAREf t _ _