ML20084J266

AO-73-12:on 730618,containment Spray Sys 2 Automatic Reset Circuitry Failed.Caused by Relay Coil 16K22B Failure.Coil & Relay Series Resistor Replaced

ML20084J266
Person / Time
Site:	Oyster Creek
Issue date:	06/28/1973
From:	Reeves D, Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
References
AO-73-12, NUDOCS 8305120290
Download: ML20084J266 (5)

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Jersey Cent cal Power & Ligh t Compatny I

M ADISON AVENU E AT PUNCH GoWL ROADD M c P h!ST oWN, N. J. 07900 0 533-6111 June 28, 1973

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Deputy Director for Reactor Projects [', .,/i'~?q Directorate of Licensing ,! - f' -

United States Atenic Energy Co::,aission c .; L.

'a Washington , D. C. 20545

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Subject:

Oyster Creek Station ' ! QI O Docket .;a. 50-219 Ccntaincert Spray Systen Failure The purpose of this letter is to report a failure of containt..ent spray system #2 autoratic reset cireuitry due to a failed relay coil 16X22D; eddition-ally, f ailure of rentainnce .: pray pu- p SIC to na:.u :l]) s tart u;'an actua t i ai; t h .- 1ech m' cc,rrn! n i+ch in th^ control rncm '! h i r event u .: en t i de r e:i to be an abnor.nl eeuurrence as defined in the Technicci 5pacifications , Para-g r:7 ' 1.15.D. Mtification of this crent as requi red by the 'lechnical Specifi-caticas was nade to "JC Region I, Directorate of Regulatory Opcrations on Mcaday, June 18, 1973.

Folloeing successful perfernance of the containment spray systen automatic initiarien test, the systeu elas rc turned t o norna l standby readiness.

I!owever, about an hour and a half later, an odor of overheated insulat;en was detected by aa electricinn performin;; routine inspection in the 460 switcho, car roca, in which centainment snruy logic panel ER8B is located. The odor uas traced to relay 36R22B k! :ch perfor,n the function of autoratically resetting the rysten to a stanaby condition when the unde switch is returned to " auto:natic.

The relay was fcnnd in the &-energi zed state then it nonaally should have been ene rgi .:e d.

Relay details are as follcas:

Man u f.le t ure r: General Electric Model. CR282D Type: 125 VDC 'IDPU Upon replacing die coil and ceries resistor on the re]ny, the sy.iten was placeci in the "!caande test" oede und an operabili ty chcch at t emn ed on cca duuent spray pu o 5M ilm t cer, the pt :n did not ra"t. Fu'y 5 D , in ti.e

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8305120290 730628 V l PDR ADOCK 05000219 5165 -

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Q, Mr. Giambusso June 28, 1973 The failure of relay 16K22B is thought to have been caused by an internal breakdown of the coil insulation resulting in an "open" in the coil windings.

The pucp starting failure as traced to a wire which had broken off from the key lock switch. This broken wire may have contributed to a previous failure of containcent spray system #2 u' ich was reported by Mr. I. R. Finfrock, Jr. in his letter of August 11, 1972 to Mr. A. Giambusso. The wire failure was noted to occur at the break i_n insulation near the terminal connection. This break was not detectable in the inspection reported in the referenced 1ctter.

The circuitry and compon uts associated with relay 16K22B were checked to climinate any external cause for the failure. The coil and series resistor on 1bK22B were replaced. In order to check the auto:natic reset capability of the system, the system r.cce switch was then placed in "dynanic test" and a surveil-lance test initiated. During this tes t , the broken wire on the key lock switch was found and reconnected and the node switch returned to " automatic". The system returned to a standby condi tien and the relay was verified to be energized.

Further volta;;c checks were nade on the relay and found to be satisfactory.

In each of the tuo above cases, the containment spray system wculd have functioned norn211y had it been called upon for emergency service. Following the failure of relay 16K223, the system would nat have " reset" automatically if the mode switch had been moved cut of "autcuatic" to so.ne other code. The operator, however, would have been aware of this failure due to the presence of the " disabled" alarm and could have reset the system manually.

The failures of relay coil 16K228 and the broken key lock switch wire were isolated events which do not indicate the need for any further action.

Enclosed are forty (40) copics of this report.

Very truly yours,

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Donald A. Ross '

Manager, Nuclear Generating ."tations DAR:cs Enclosures cc: Mr. J. P. O'Reilly, Director Directorate of Regulatory Operations, Region 1

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I ^ bxket )b. 50L) j th time: 12:30 p.m.

- AB)KHMAL OCCURRENCE  ;

REPORT ro. 73 - 31.

f SmVECT: Violation of the Technical Specification, para._ .

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Failure of ContMnrent Snray &fstm 2, to autcunticaDy reset to the I o;hrable rode upon returnire tic node switch to nutenatic duc to a 3 ' b;rned re)ay, 16X22B. 1.ddititrmDy, failure of Conta$ ment Spray

hmp 51C to start upon actuat$yG t)* Rey lock and centrol switch in tic Ocatrol Bo

rn due to a disccmected w$ro on the key lock switch.

t Thi.s event is considered to be an abnomal occurrence as defined in ~

the Technical Specifications, para._1.*jsp . Notification of this event as required by the Technical Specifications, para 6.6.B was made to AEC Region I Directorate of Regulatory Operations on Idnjay Jum 18,197'4 .

! SITUATICN fi Ponow3Jg successful perfomance of the Contaiment Spray Systm adtcratic initiation test, the system was returnce to nomal standby 1 rdadimss. However, abuut an haar and a half later, an odor of bumed 1pu}ation was detected $n the 46050R Rocrn, in which is located Con-taiment Spray logic pane) ER8B. Tne odor was traced to reaay 16Y22B wEich perfoms the functicra of autcnnticany reactirg the system to a stgandby condition when the rode cwitch is returned to "autarctic". 'Jhe Palay was fcund in the de-energizc<3 state when $t nomaDy bhou3d have i bcen energized.

lbon replacirs the coil ard series resistor on the relay, the

, tm wan placciin the "Djnxdc 'Jbst" node and an operab$lity check

'1 I at ed on Contairnent Spray Turrp 530. )ksever, the pmp 650 not, s art. hop b'lD, in the save systen, wan checked and found to start sqtisfactorily. Voltage checks were nade across the key lock switch

PJJ1 the PTCDaem was detenened to exist at that- po5nt. Further checking

.f 2Yvealed a loose wire broken off cm of the key lock tennirnis.

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{' f 9hc preirature failure of relay 16X22Wis th:ught to Mye been.

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caused by an internal bre:9:dwn of the coil insulaiden resu3tirc $n an

1. "cpen" in the coil wirrliivm Tne puro starting fai3ure was traced to

~l a wire which had beetne discon'rcied frcm the key lock switch.

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J RD4EDI A_L ACTION:

{ Tne circuitry and ccnponents associated with relay 16X22B werc

l-checked to climinate any external cause for tln fai3um. 9he coil a)xl

j- series resistor cn 16X22B were replaccd. Tne system node switch was then placed in "Dynunde" test, a survei33ance test nm durjng which time

< the lo.ce wire on the key 30& switch was found and tightemd, and the node switch returned to "auttnatic". The system mturned to a siandby ccoditico and the re3ay was checked t.o be energized. Further voltage checks were nade co the relay and found to be satisfactory.

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SAFETT SIGl'IFICAUCE

j l In each of the two above cases, the Ccotaiment Spray System wculd g have functictned noranlly had it been called upon for service. lo11owing I the fa$1ure of relay 16X22B, the system would not have " reset" auttnatically

. j if the rode switch had been roved cut of " auto >mtic" to scnc other node, then back to "auttnatic". Tne operator, ha>:ever, would have been aware of this i

failure due to the presence of the " disabled" alann, and ccald have reset the cystem rannnay.

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3 Prepared by: ym- pm,nr ,n. Dato r. Jum 19,1973

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Licensce: Jersey Central Power & Licht Co.

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$- 11. . D. Thornburg, cut Docket No.: 50-219 1 Chief, FSSEB j Abnormal Occurrence: TUX dated 6/18/73 [ O'YJ /

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• DR Ccatral Files (1) eut The attached report from the subject licensee is Regulatory Standards :3)

Dir. of Licensing (13? forwarded in accordance with no Manual chanter 1000 j to gameansun.o WHA 15 Rt"*Ra5

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The action taken by the li_censee is considered

'I are appropriate. Followup will be performed during

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atuaans the report have been forwarded to the PDR, Local fl } .Wy,-

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,61 PDR, NSIC, DTIE and State representatives. The D. L. Caphton, RO:I licensee will submit a 10 dav written report to

• ee3.NE ha CATE 6/20/73 Licensing.

U5c OTHER Salet FOR AC04TIOfial REMAaKS . Cfo r 8911 O = 445

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