ML20085G126
| 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: |
| References | |
| NUDOCS 8308240305 | |
| Download: ML20085G126 (2) | |
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U AE:OIC:AL OCCUPJE!!CE REIU 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.
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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.
Co
~.rrective.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.
8308240305 741129 PDR ADOCK 05000 S
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IIovember 29, 1974 A
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, 4 I'.r. Ericon G. Cace Acting Director of Licencin; Office of negulation U.S. Atomic Enerr;/ Corr.iccion
'lachington, DC 205k5
Dear I:
- r. Cace:
TE",". SOEE VALLI"I AUTHORI'I"I - ?RC'..~.:S 'TIRY TUCLE.'tR PIA' T U' TIT 2 -
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- m; -c.c' s/ (., e,t a, 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.
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Very truly yourc, f'd\\ !:, ~,' j, /'Q.
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