05000259/LER-1981-002-03, /03L-0:on 810114,smoke Detector in Relay Room Alarmed & Would Not Clear.Caused by Detector Sensitivity Increasing Due to Normal,Natural Aging.Detector Replaced & Tested

/03L-0:on 810114,smoke Detector in Relay Room Alarmed & Would Not Clear.Caused by Detector Sensitivity Increasing Due to Normal,Natural Aging.Detector Replaced & Tested

ML20003B192
Person / Time
Site:	Browns Ferry
Issue date:	02/05/1981
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20003B189	List: 05000259/LER-1981-002, Forwards LER 81-002/03L-0 05000259/LER-1981-002-03, /03L-0:on 810114,smoke Detector in Relay Room Alarmed & Would Not Clear.Caused by Detector Sensitivity Increasing Due to Normal,Natural Aging.Detector Replaced & Tested
References
LER-81-002-03L-03, LER-81-2-3L-3, NUDOCS 8102100501
Download: ML20003B192 (2)

LER-1981-002, /03L-0:on 810114,smoke Detector in Relay Room Alarmed & Would Not Clear.Caused by Detector Sensitivity Increasing Due to Normal,Natural Aging.Detector Replaced & Tested

Event date:
Report date:
2591981002R03 - NRC Website

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT OESCRIPTION AND PROS ABLE CONSEQUENCES h 1o12l lDuring normal operation a smoke detector in relay room alarmed and would not clear.

1 io l 3 l lThe alarm would have masked signals from detectors required to be operational by l

DrT71 1T.s. 3.11.c.l.

There were no significant resulting events. There were no effects l

'loisi lon public health or safety. There are no redundant systems. Previous occurrence:

1 I o is I I BFRO-50-259/80041.

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CAUSE

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CODE TYPE No.

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33 35 36 31 40 el 42 43 44 47 CALSE OESCRIPTION AND CORRECTIVE ACTIONS l i ) o l l Increased detector sensitivity due to normal, natural aging caused the event.

I 1iliI l Detector was replaced and successfully tested per SI 4.ll.C.1 and 5.

Kidde I

g,i7i l ionization detector, Model FT-200.

No recurrence control required.

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a a A S LPOWER oTHER STATUS DISCO RY DISCOVERY DESCRIPTION l~lAl@lOperatorobservedalarm.

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Ferry Nuclear Plant B F li. 2 1/10/73 LE!! SUPPLEMENTAL INFORMATION

.t y,,, :20 259 /_ 81002 Technical Specilit etton involved 3.11.c.1 at;< -:ed Under Technical Specification

6. 7. 2.b (2)

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• e i ')ccurrence 1/14/81 Time of Occarrence 1600 Unit 1

hi-9..~atian and Descrintion ~of Occurrence:

l A smoke detector in'Telay room alarmed and would not clear. The alarm would have masked signals from detectors required to be operational by Technical Specifications.

I Cor.ditio_n_s Prior tc. Occurrence:

Unit 1 at 99%

Unit 2 at 100%

Unit 3 at 0% refueling outage ict....y.u.aiat in the Technical Specification Surveillance Req'tireraents me:

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s monerable equipment. Describe.

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t Cause of Occurrence:

Increased detector sensitivity due to normal, natural aging.

A n...., of Occurrence.

There was no damage to plant equipment. There was no activity release, no personnel exposure or injury and no -danger to the health or safety of the'public.

i C r r-t r. e Act ion :

l The detector was replaced and t,ested successfully per SI 4.11.C.1 and 5.

t F G.:.. Dat a.

BFRO-50/259/80041, 249/79015, 259/78009, 259/78001, 296/78028, 296/78026, 296/78023, 296/78017, 296/78009.

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