ML20010B863

RO 50-259/81-09:on 810304,during Evaluation of IE Info Notice 80-45,mode Selector Switch Had Same Deficiency Identified in Notice.Apparently Caused by Circuitry Design Deficiency.Procedure Revisions Will Be Made

ML20010B863
Person / Time
Site:	Browns Ferry
Issue date:	03/05/1981
From:	Abercrombie H TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
IEIN-80-45, RO-81-013-01P, RO-81-13-1P, NUDOCS 8108180401
Download: ML20010B863 (1)

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TEI.ECOPT TO NRC 46/34/ - ~~ s U. 5 nucteur Regulatory Co==f asion K451** El 101 MaaleeLLA S tr eeert , und ipl

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I Date of occurressce 3/4/81 Times of occasrrences 12 :00 aux,aa unit O l

Technical Specificatiott Involved

• Techrnical Spec.if is at t.o.. Tamble 3.1. A. .I Conditieme Prt,ny_tn Decarrremme nest e I npe.caesap,et 1,J71. Pose g unit 2 operattna at 1.100 mie s unit 3 overat;1ng at 110L Deta.

Identificatiott ausd Description af Oce-strrenge puring the evaluavian of Mac IE Inforunation Notice SMS, it was daeemrumis>=d tiset slie susde selector seritch on stvenam Ferry innlem 1. , 2 and 3 had ette

- - deficiency istemmt. if ied in thee f ru frermetion not. ire = in that upon a loss o f poneer t o su RPS bus witta a subsequerst ressenrattoe of posee r . the mannual scr=== capabilit. ins of the umode selector eartech cau2A be Lost by a rapid entir r h i n g to the shetac=us ponieloe.

Appa r u-nt Caume o f Occurr--

A circuitry design deficiency metalch =Lil.szara re leys K-17 tes rem t = decuergized due to a relay race between relays K-16 and re.1aya E-17.

Ottner Related Events Mone s

_Co r rwe t Lw sac t isne Takew=_ne Pisumasar-d Operationne personsas.1 hawn haert inrarmed Etnat upon e lo== of pemer to the RPS ctreestevy fo11amed by reme.oratlon of power. if the mode me.le-ctor switch in turned to shutdoern, an der 11be.ra te pause of several escando er11.1. He unde tan either the startup or refuelista usede before going to the sh<stdown position. Procedure retrielone wi.L1 be amade refleccism amonw approprjta ts act on ens the costa t tien is better ansiywed h

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