ML20028F014

LER 83-003/01T-0:on 821222,w/RCS in Mode 6,during Test on Diesel Generator Load Shedding,Five Relay Timers Found Exceeding Tech Spec Tolerance.Caused by Instrument Drift. Timers Recalibr on 830118 During Mode 3

ML20028F014
Person / Time
Site:	Cook
Issue date:	01/19/1983
From:	Palmer R INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20028F007	List: ML20028F006 ML20028F014
References
LER-83-003-01T, LER-83-3-1T, NUDOCS 8301280354
Download: ML20028F014 (2)

Text

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EVENT DESCPIPTION AND PROBABLE CONSEQUENCES hio g l WITH THE RCS IN MODE 6. DURING A SURVEILLANCE TEST ON THE DIESEL GENERATOR LOAD SHED ,

,o,,,i DING, FIVE RELAY TIMERS WERE FOUND TO HAVE EXCEEDED THE TOLERANC8E ALLOWED BY TECHNICAL,

,o ,,,,; SPECIFICATION 4.8.1.1.2.c.2. THESE RELAY TILLERS WERE NOT RECALIBRATED UNTIL 1-18-83  ;

,o,s, , WHEN THE UNIT WAS IN MODE 3. THIS CONSTITUTED AN IN0PERABLE A.C. ELECTRICAL POWER ,

,O 9,,; SOURCE AS REQUIRED BY TECHNICAL SPECIFICATION 3.8.1.1.b. THE PUBLIC HEALTH AND ,

lo ! rl i SAFETY WERE NOT AFFECTED.  ;

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, , , o i l THE OUT OF SPECIFICATION VALUES OF THESE FIVE RELAY TIMERS (MANUFACTURED BY AGASTAT, i

i.,,,i fl0 DEL 7012) IS ATTRIBUTED TO INSTRUMENT DRIFT. ON 1-18-83 THE TIMERS WERE INDIVIDUAL ,

,,,,ji LY RETESTED WITH THREE OF THE FIVE RE1.AYS FOUND TO BE WITHIN THE ALLOWABLE LIMITS. ,

,,,3, l THE REMAINING TWO RELAYS WERE READJUSTED AND VERIFIED TO OPERATE WITHIN THE ALLOWABLE ,

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ATTACHMENT TO LER# 83-D03 -

SUPPLEMENT TO CAUSE DESCRIPTION THE OUT OF SPECIFICATION VALUSS OF THESE FIVE RELAY TIMERS (MANUFACTURED BY AGASTAT, MODEL 7012) IS ATTRIBUTED TO INSTRUMENT DRIFT. ON JANUARY 18, 1983, '-

THE TIMERS WERE INDIVIDUALLY RETESTED WITH THREE OF THE FIVE RELAYS FOUND TO BE WITHIN THE ALLOWABLE LIMITS. THE REMAINING TWO TIMERS: ESW PUMP 2E EXCEEDED THE MINIMUM ALLOWABLE TIME BY 0.37 SECONDS AND SI PUMP 2N EXCEEDED THE MINIMUM ALLOWABLE TIME BY 0.14 SECONDS DURING THE RETEST. THE TWO RELAY TIMERS WERE

! READJUSTED AND VERIFIED TO OPERATE WITHIN THE ALLOWABLE LIMITS.

l THE RELAY TIMERS HAD BEEN CALIBRATED PRIOR TO THE SURVEILLANCE TEST ON DECEMBER 22, 1982, AND LEFT WITHIN SPECIFICATION. PAST HISTORY ON THESE AGASTAT RELAY TIMERS IS THAT THE TIMERS DO NOT REPEAT THEIR SET TIME CONSIS-TANTLY. A CONSCIOUS DECISION WAS MADE BY THE SUPERVISOR IN CHARGE NOT TO RECALIBRATE THE RELAYS SINCE THEY HAD JUST BEEN CALIBRATED PRIOR 10 THE SURVEILLANCE TEST AND THE RECALIBRATION WOULD NOT ASSURE CONTINUED PERFORMANCE WITHIN REQUIRED TOLERANCES.

FRESENTLY AN ENGINEERING REVIEW IS BEING CONDUCTED ON A NEW TYPE OF SOLID l

STATE RELAY. DEPENDING ON THE RESULTS OF THIS REVIEW, THE EXISTING RELAY TIMERS MAY BE REPLACED.

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