ML20084T858

LER BFRO-50-259/7625:on 761122,one Start Circuit Breaker on Diesel Generator B Found Inoperable.Caused by Failure of Square D Co 30 Amp Breaker L25V909 to Supply Power Due to Broken Stud Holder on Connector a

ML20084T858
Person / Time
Site:	Browns Ferry
Issue date:	12/08/1976
From:	Fox H TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
LER-BFRO-50-259-762, NUDOCS 8306240211
Download: ML20084T858 (2)

Text

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l l (PLEATE P T Alt REQUIRED INFCRM ATION)

LONinOL CLOCK:l l l TA$c tctNst NuvotR

• iyN TYPE

{ l A lL l B l Rl Fl 1l l 0l 0l-l0 l 0 l 0 l 0 l 0l-l 0l 0l l4 l 1l 1! 1l130! !0!3l 31 32 14 15 2S 26 7 09 (VENT DATE RCPORT OATE CAT (CCAf TvP u CE DOCKET NU*/P( A QCOwT l57 7 6 l

60 l W63 W60 l 0l 5l0 l-l Ol2 l5 l960l l691 l I l 2 l 2 l 7 l 6.l U1 74 l

75 l I  !  !

60

[ VENT OESCRIPTION l

Q] During the performance of a scheduled maintenance test. ene nenre rivciif e breaker 7 89  !

Q l on dicac1 generator B was found inoperable. The second start ciretii r ime enlocent 60 7 09- replaced. l i h l and was operable. The other three fleceln vere orornhin_ 'rk n kvnane o,g t>3 7 89  !

h l All engineered Safety systems were available on units 1 and 2. (BFRO-50-250/76?51-EJ 7 89 l hl 7 89 p,wg 60 S R M CU R VOLATON E CODE COMPC*.FPJT CODE lElBl O  ! C! El Tl R l R ! M!  ! c: l "4 l A ! r;!

12 17 43 44 47 48 7 80 10 11 CAUSE OECCR;PTION power to one diesel l g l A square D company 30 amp breaker no. L25V909 failed to supply 60 7 H9 The brenker une  !

Q l start circuit because of a broken stud holder on A connector. 60 7 89 l

@ l replaced.

F AC(it y METHOO OF OTHER STATUS DISCO vEny 0:SC0vinf DESCAiPTION STATUS . % POWEA h W l 0l 4! 0 l l 10 12 13 MA 44 l h]

45 46

! NA 80 7 8 9 AMOUNT OF ACTivtTY LOCATION OF AELEASE P LE S O ELLASE ll 7 0 b

0 dl10 11 NA 44 l  !

45 NA 80 PERSONNEL EXPOSURES NUMD(R TYPE DE SCHiPfiON 1 l 010 l 0 l lEl l NA EO 7 09 11 12 13 PERSONNEL INJURIES NUV0f A 3E C A PTION ll l0 l 0 l 0 l l NA 80 7 89 11 12 OFFSITE CONSECUENCES ,

NA l Ql 7 89 60 LOSS OR OAMAGE TO FAC:LITY Tyrf OCSCW T CN l ll l Aj l NA 7 o9 to 8306240211 761208 '

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$DRADOCK 05000259 PDR .NA  !

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• 0" 7 09 ADDITIONAL FACTORS l Thin in a random failure.

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TENNESSEE VALLEY AUTHORITY g p 4 CH ATTANOOGA. TcNNESQcc 37401 g% . ,?

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December 8, 1976 i

, . I Mr. Norraan C. Ifoseley, Director U.S. Nucicar Reguintory Cocimission Office of Inspection and Enforcement Region II '

230 Peachtree Street, NW., 8th Floor Atlanta, Georgia 30303

Dear Mr. Hoseley:

TENNESSEE VALLEY AUTHORITY - EROWS FERRY NUCLEAR PLA'IT UNIT 1 -

DOCKET NO. 50-259 - FACILITY OPERATINC LICENSE DPR REPORTABLE OCCURRCICE REPORT EFRO-50-259/7625 The enclosed report is to provido details concerning one start circuit breaker on dicac1 generator B that was found inoperable during the performance of a scheduled maintenance test. This report la submitted in accordanco with Brouns Ferry Technical Epecifications Section 6.

This event occurred on Browns Ferry Nuc1 car Plant unit 1.

Very truly yours, TENNESSEE VALLEY AUTHORITY 0

e p ., lc<,,/ .

H. S. Fox N .;3 C\

4,,f,f , f' h,.,, ; j Director of Power Production %y fjg ' I,; y U.5,n ; ' ldi]% ,N0j Enclosure (3) k, , ts i hD CC (Enclosuro) /' * ,W Director (3) ,

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Office of Management Information and Program Control U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Director (40) l Office of Inspection and Enforcement U.S. Nuclear Regulatory Connaission -

Washington, D.C. 20555 -

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An Equal Opportunity Employer #

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