ML20086K581

Telecopy AO 74-56:on 741218,RCIC Inverter on Panel 2OC19 Failed.Caused by Component Failure.Inverter Replaced & Returned to Svc

ML20086K581
Person / Time
Site:	Peach Bottom
Issue date:	12/18/1974
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086K578	List: ML20086K575 ML20086K581
References
AO-74-56, NUDOCS 8401270296
Download: ML20086K581 (2)

Text

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Pench tal tora Atomic pove St.ntton Deltn Iennio.tvanin g 17314 ilecember 30, 197<.

Jir . 1anen P, 0'1h 11ty.-Dir<ctet UnLteel States At em te linerny conni os.lon Dit'*:c t ora t e of largu t e i er) Operat(ons f11 park Avenue King of Pr ot:rin. Pennnytranto l '. '. u t, round cc_t,i A,b nf,r,rs.e,1,,ycp u,r,r a; tic e_2,4, Ho o r,y3_o t_tj,1 :n t Ip,tj confirntun 1,

r. Irnor' phone convei nat inn vii h fir. Uni r linunac h , A.r.c, Regieri 3 Regnint ory Operationn (si fice on ficternber 10, 1974 Referenec: 1.lcetine Unmber tiPH-44 Techplent speciffention'3.5.D -

Mcport No.:

Report Onta; 50-277-74-56 Dec rntie r .1 8 , 1974 bY@,e

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Occu rretice D1t e t flerernbe r 1H, 1414 [;/,'j".

Facility:

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Deltn, PennsyJvnnio 17314 a . , ,g,g A ,flu, A , :t 4.

2dentiflent.lon of Occurrence: * *\

'Y . d. .:4 ra llure of. ECIC Tnverter en 1.UCt') panel.

.O Conditionu Prior. to Occurronce:

( g'\gg$ d

_. Unit 2 operntlog nt.957. power.

Dencript inn of occurrernee: '

During tripped uteady-r.

for no apparenttate.pinnt r e:Joperotlon, oon. the RCIC Invert er on panel 20G19 y'

" DeNignntion Of Apparent Cin: HP of Ocontrfnce; ComponengfailurewichtutheRCICAnvetter. '

Amlynlo of joccurrences

.u-At the t.tne Cooling of the Sy<.tcru inverter vere operable,tripping, all other Unit 2 Freergency Core j ?' y ratinre of-thin

'#' proper dIpre of ton ' in the aurorr.atic t~lnv centrol rede. Inverter only prerlu< fos .

.RCIC nyn t em renin in a The rrst of 1hv ntact nignal. The RCIC rerntua fu t ty operat f oun t und f unet tena! utelor n low . level inod e. fully opernhte in the nr.nnu.al cont rol van The time tron t.be ini t in t t ripp ine, ont (l' a r eplace.a'ent device ine.t alled and checked van lese t han .I hour. Theref' ore the rentetv ic.plicatfuna nre nintnal for t.hl o ac t ui x coc e. ~

Cor rec t.tvI ' Ac t lori:

It J4an ' determined that the fnijnre: vas v! thin the itCIC lovert.or it sel f by li;olnt ing it iron .itn innd on 1 o<. Serving t.liot it would onis a y on for.p fev uccenJg. The invert er von Jmmed ia t ely replored ut tli un

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_2-Abnerr,n1 Occurrence 2_4-Itour _!?or.1_flent lon Itgnet 50-277-74-56 identical gorni spare and returried to ocevice. Invent ignt.lon and repair of the failed unit continues.

Failure Dato r Six other tripptnnr4 of itCIC invertern have beten reported an Abnormal cerurrence Repor t. Hwnbern 50-277-74-14, 50-277-74-20, 50-277-74-37, 50-277-74-39, 50-277-74 40 nnd 50-270-74-5.

Very tru1 3 yourn, f- c ., 7. .

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b'. T.1111 rich, Superint endt nt Prmch Mott.ma Atocie Power Station 4

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