ML20085G126

AO BFAO-50-260/7427W:on 741121,core Spray Injection Valve 2-FCV-75-53 Failed to Open.Caused by Jammed Valve Due to Misadjustment of Closing Limit Switch on Valve Operator. Opening & Closing Limit Switches Adjusted

ML20085G126
Person / Time
Site:	Browns Ferry
Issue date:	11/29/1974
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Case E US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085G133	List: ML20085G126 ML20085G137
References
NUDOCS 8308240305
Download: ML20085G126 (2)

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(3 U AE:OIC:AL OCCUPJE!!CE REIU 0

Report I!o. : BFAO-50-260/7h27.!

Rcoort Date: I!cvember '{7, l')74 Occurrence Date- :ovember 21, 197h Facility: Bro enc Perry ::uclear Plant unit 2 Identification of Occurrence Failure of unit 2 core cprny injection valve 2-FCV-75-53 to open.

Condition: Prior to Occurrence Unit 2 una opernting at appronimately 50-percent pouer durinc ctartup tectin3 Tne HFCI van inopereble nt thic time.

Denerintion of Occurrence At 0255 hourc on !!ovember 21 during ::0V opernbility curveillnnee tecting cue to HPCI being inopernble, unit 2 CSS loop II inboard injection vnive 2-707-75-53 vould not open. ..aintenance forecc were notifie:1 and a controlled chutsc . ' of the renctor .ran initinted.

Denir.netion of Imnnrent Cance of Occurrence Invecticntion indiented that the valve was jerr.ed in the cloced position. The opparent cause of this condition unc n nicadjuctment of the clocinc l bit ccitch on the valve onerator. The linit switch contacts were found to open citolo necurly uith the openin; cf the clocin; tcrque switch contcetc.

!.nnl:rnin of Occurrence t

Iocn of this CSS loop crented no henard to the enfe cueration of the reactor cince all of the other reactor ccolant cysten except HPCI were opertble, lio condition devolmo.i :in c.i m: ' he period of incper: oility rc uiring rutor ' tic actuation -1 thic cy-ter. Tai c fnilu;c cruce-1 no drr.cr.e to cry cyc terc , ctructures, or co . .c. Tnee .cru no r/crce effectc on the henl;h cnd n fety of = 7 blic, end there vere na perconnel ;njuri.ec or enpocuren due to thic occurrence.

~.rrective Co -- .ction The vtlve nc rauclly openc? fror its jrized conlition. T.:e torque cuibh operction end cettinc were checked and found to be caticfnetory. The valve' i

oner - an I cleci - li m . .c5 vere chee::ed r-i Mjuct ri c accord"nce h ..

electrical nninten;nce inctructions. The valve uas caticfactorily tested after maintenance was completed.

Failure Dnta The limit switch ic ranufactured by Linitorque for a S!2-2 operator.

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I'.r. Ericon G. Cace '

Acting Director of Licencin; Office of negulation U.S. Atomic Enerr;/ Corr.iccion

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TE",". SOEE VALLI"I AUTHORI'I"I - ?RC'..~.:S 'TIRY TUCLE.'tR PIA' T U' TIT 2 -

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,-.r The enclosed report in to pr:2 vide Cetn51c corcerning failure of unit 2 core cprey in.jecticn valve 2-FCV-75-53 to cren and is cubnitter! in nccor&nce . tith !.ppendi:: I. to P.e;ulatory Guide 1.16, Revicion 1, October 197j. Thic event occurred on Brorns Ferry i ut leer Plant unit 2 on I!ove.:.ccr 21, 1974.

Very truly yourc, /f \\ N

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