05000321/LER-1981-017-03, /03L-0:on 810307,timer Relays B21-K752A & B Found Out of Calibr During Functional Testing.Caused by Setpoint Drift of Agastat Model FTR 14D3EC750 Relays.Relays Will Be Recalibr Prior to Startup

/03L-0:on 810307,timer Relays B21-K752A & B Found Out of Calibr During Functional Testing.Caused by Setpoint Drift of Agastat Model FTR 14D3EC750 Relays.Relays Will Be Recalibr Prior to Startup

ML20003E192
Person / Time
Site:	Hatch
Issue date:	03/26/1981
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20003E189	List: 05000321/LER-1981-017, Forwards LER 81-017/03L-0 05000321/LER-1981-017-03, /03L-0:on 810307,timer Relays B21-K752A & B Found Out of Calibr During Functional Testing.Caused by Setpoint Drift of Agastat Model FTR 14D3EC750 Relays.Relays Will Be Recalibr Prior to Startup
References
LER-81-017-03L, LER-81-17-3L, NUDOCS 8104020466
Download: ML20003E192 (2)

LER-1981-017, /03L-0:on 810307,timer Relays B21-K752A & B Found Out of Calibr During Functional Testing.Caused by Setpoint Drift of Agastat Model FTR 14D3EC750 Relays.Relays Will Be Recalibr Prior to Startup

Event date:
Report date:
3211981017R03 - NRC Website

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LICENSEE EVENT REPORT ONTHOL DLoCK: l l

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8 LO 61 DOaET NVYtsEn t*3 tiJ G ENT DATE 14 PJ HLPOnT DAT E t!O EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10121 i Wi th Unit 1 in refueling while performing a logic system functional test!

go i3l I of the automatic depressurization system per Hf1P-1-3252, timer relays l

lo l41 l B21-K752AT.B we re found ou't of calibration.

fio significant occurrence I

ltook place as a result of this event.

This is a nonrepetitive occur-l o 5 lo lc l l rence for these timers.

Unit 2 was not affected by this evUnt.

This i

Iol71 i event was in violation of requirements set forth in Tech S ~p e c s table I

1018113.2-4.

This event posed no threat to puolic health or sa fety.

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8 9 80 SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COVPONENT CODE SUBCODE SUBCODE Lo_LJ IS IF l@ l El@ l El@ l R l E l L l A l Y l X lh [J!@ U @

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9 10 11 12 13 18 13 20 SEQUENT'AL OCCURRENCE REPORT R E VISION LE R EVENT YE AR REPORT NO.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O lThis failure was caused by setpoint drift of the relays which a re Agas-i 11111 I tat nodel FTR 14D3EC750.

These relays will be recalibra ted prior to I

i 2 l unit startup.

fio further corrective action is required.

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8 9 80 SI A S

% POWE R OTHER STATUS ISCOV FY DISCOVERY DESCRIPTION li 15 I ()H_j@ l 010 l 0l@l tlA l

l B l @ l Routine Surveillance l

' !TiviTY COR1ENT A

RELE ASED OF RELE ASE AVOUNT CF ACTIVtTY LOCATION OF RELE ASE li Ic I (1] @ L1J@l r:A I

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7 8 9 10 t1 44 45 80 PERSONNEL EXPOSUHES NUMBER TiPE DESCR;PTION l01010l@lZl@l t1A l

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,E R sONd',~,uL S NUVat R DESCR$PTION 1010101@l flA l

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NAME oF PREPAHEn C. I Coggin. Supt. Plt. Eng. Serv.

psoNE: 912-367-7851

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LER f:

50-321/1981-017 Licensce:

Georgia Power Company Facility Name:

Edwin I. Ilatch Docket #:

50-321

Narrative

Report for LER 50-321/1981-017 With Unit 1 in the refueling mode, while performig a logic system functional test of the automatic depressurization

. system (ADS) per liNP-1-3252, timer relays B21-K752AGB were found out of calibration. -

These relays provide a 120 second

. time delay between initiation of the automatic depressuriza-tion system permissive signals and actuation of the ADS safety relief valves.. This-delay provides operators with enough time to override the. signals - 'and prevent valve opening if this action is determined to be desirous.

B21-K752A actuated in 160 ~~ seconds.

B21-K752B actua ted ' ~ in 200 seconds.

This means

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that actuation of the. ADS valves would have been delayed in an emergency situation.

Iloweve r, this delay can be overridden by f')

manual' valve actuation.

Therefore, no unsafe condition exist-U ed that.could not have been corrected by operator action.

Thesc = relays will b_e calibrated. prior to unit startup with no further corrective action required.

This i s a nonrepetitive occurrence for : these timers.

No significant occurrence took place as.a result of this event.

This-event pored-no threat to public health or safety.

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