ML20085G024

AO BFAO-7331W:on 731025,turbine Condenser Low Vacuum Switches PS-2-1A & PS-2-1B Setpoints of 22.75 & 22.8, Respectively,Did Not Meet Tech Spec Requirement.Switches Inspected & Reset.Test Frequency Increased to Biweekly

ML20085G024
Person / Time
Site:	Browns Ferry
Issue date:	11/02/1973
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085G030	List: ML20085G024 ML20085G034
References
AO-BFAO-7331W, NUDOCS 8308240179
Download: ML20085G024 (2)

Text

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O O TENNESSEE VALLEY AUTHOAITY ry f'/, r CHA'ITANOCGA, TENNESSEE y 3740'l w 'b / A

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November 2 1973 7

=a w ANNIVE n wua y OF PlionLC IN PAMT N r . r4 G HIP A  % 4 N((f 4

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wr gu,s Mr. John F. O'Irary, Director FL ytr%

Directorate of Licensing Office of Regulation U.S. Istoaic Eaergy Ceraission Washington, DC 20545

Dear Mr. O'Irary:

TE:i:!Z3 GEE VATTDI NJ~ ~C3ITY - ERCt"JS FE2.Tl UUCIEAR PIRIT UNIT 1 -

DCCi?:T :;0 50-259 - F?CILITY OPERS.TII:G LICEI!CE DPR AB:!OPl:AL GCCURRS::Cd R_: PORT EF1.C-7331W The purpoco of thin report it to provide detaile concerning the

nalfunctica cf two turbi u condenrer~ low-vacuum switches in unit 1 of Erou:- c 7 err 3 ;;uclear Plaat en Cetober 25, 1973

. Thic occurrence vac rcparted by telegran to the Region II Directorate of Regulatory Operatienc, Stlanta, Gecrgia, en October 26.

Dateriptica of the Incident During tecting cn Cetcher 25 ac required in LFl.0-7323U, PS-2-1A and PS-2-lb (turbiae coalcacer low-vccuum cvitches) were found to operate outcide the technical cpecificatica cetpoint of equal to or greater than 23 inches of mercury vacuum ac specifi,d in Table 31. A. The as-found cettings vere 22 75 and 22.80 inches of mercury vacuum, recpectively.

The cuitchec are arrangcd in a one out of two taken twice logic in the reactor protection systeia. The other tuo channels were tected and found to operate saticfactorily; an1, if required, the RPS logic vould have perfol.ned itc intended function. The reactor vac at approximately 15-percent pcuer.

Investigation and Corrective Action The nochanica of there cuitchen, Earkcdale model DIT-R18SS, vac incpected for binding, nicaligraent, or other irregularities; nonc were found.

The suitches were recet and operated ceveral timen to encure repeatability.

An accelerated tecting frequency of once a week hac been initinted for all four cuitches of thic reactor protection n ctem function. After 8308240179 731102 hDRADOCK 05000259 \ ~ y / [I PDR V y y b

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2 Mr. John F. 0"eary

"' Iloventer 2,1973 s

T?.::iD:3CEE VALLEY /dJTiiCRITY - LRU.?::C FELY ITUCL'El PIR:T U::IT 1 -

DOC 1'r;T I:0, 50-259 - FACILl'fY OPd:1ATl :G LICr: 3E DPR Ah::012AL OCCUtE.:CU 11EPO:C' I'FAO-7331' three co:u.ecutive testc heve teen accespliched raticfactorily on a veckly bacic, the tecting frecuency uill be increaced to ti'.eeekly.

The original tect cchedule of once a month will be recu:ael after three coacceutive tectc have been caticractorily perforacd on t:ie biweekl;. frequency.

Very truly.yourc, TE::!ESCEF. VALIZI AUTi:CRITY

"' 73 7 -

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E. F. Tho::a c Director of Pcuer Production CC: Mr. 1:orman C. I'.cceley, Director Regica Il Regulatory Cperutions Office, UCALC 230 Peachtree Street, ii.-l .

Atldita, Georgia 30303 i

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