05000336/LER-1980-016-03, /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

/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: 05000336/LER-1980-016, Forwards LER 80-016/03L-0 05000336/LER-1980-016-03, /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
References
LER-80-016-03L, LER-80-16-3L, NUDOCS 8005090456
Download: ML19309H263 (1)

LER-1980-016, /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

Event date:
Report date:
3361980016R03 - NRC Website

text

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LICENSEE EVENT REPORT 8 05090 N

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U 00 bl DOCrFT NUMBE H Ui 03 EVEtJTTATE 74 75 it[POHT DATE ts0 EVEfJT DE SClilPT!oN AND PROBADtt CONSEQUEfJCES h

@ [ 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

monthly check and since that time there were no operations requiring bistable functionire g

UtO'-tPj pa n rtrova i j.

83 8 9 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 IU l@ LXJ@ [2j @

8 9

10 11 12 13 IS 19 20 SEQUE NTI AL OCCURRENCE REPORT REVISION EVENT YEAR REPORT NO.

CODE TYPC N O.

@,;LE R!ROI8101 l-l lo ll 161 1/1 10131 LiJ 1--I Lc.J gt";

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33 d5 3G 31 40 43 42 43 44 47 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 Atomic, part ELD-134-1170, flodel NT-4.

Previous occurrence:

1 G

i [4 i l LER 75-36,12/14/75.

I 80 8 9 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

'2 d5

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• alV,1Y <Oba OF RE LE ASE AMOUNT OF ACTIVITY LOCATION OF HELEASE i lc l 1REL1ASEOl @ lZ jgl NA l

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8 9 10_

44 45 80 11 PEHSONNE L E XPOSURES 7

OFSCRIPTION NU'0'Bf R0 l g 1PElgl Nn l

iI7l1 0 1 PEnSO d 'im u k $

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,.u.,e r a i l a j l 0 l 0 l 0 l@l NA l

8 9 11 12 80 LOSS OF OH DAMAGE TO F ACILITY TYPE D E SC RIP TICN i 191 [ Zj@l NA l

8 9 10 LO E @Tt7CniPfiONg Nnc m onty l

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Ice R. W. Bates 203-447-1791 a

PHONE:

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