AEC DISTRI i IG I FOR PART 50 DOCVET f,IAAF IAL(TEi'iPORARY FOAi'.I)

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FRp;„~. American Elec; PowerNY, NY 10004T. ED Ti ton

DATE OF DOC DATE REC'D

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'O:Region III, Keppler

ORIG1 signed

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CLASS UNCLASSXXXXX

D ESCR I P7 I Q N:

PROPINFO INPUT NO CYS RFC'D

1 signedENCLOSURES:

OC.,ET No:

0-3 S16

Ltr trans. copies of ltrs sent to Knuthre: deficiencies in coils on certainWestinghouse relays and improper wiringof the Foxboro Reactor Protection Systemon»line test panel.

PLANT NA11E: Cook 1 & 2

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AMERICAN EI.ECYRIC PORGIES Service Corporation

2 Broadfoay, Eno York, N. Y. 10004

(2)2) 422-4800

50-315 and 50-316

January 21) 1975

Nuclear Regulatory CommissionDirectorate of Regulatory Operations

Region IXX799 Roosevelt RoadGlen Ellyn, Illinois 60137

Attention: Mr. James G. KepplerRe ional Director

Gentlemen:

Enclosed are copies of letters sent to Mr. DonaldF. Knuth, Director, Directorate of Regulatory Operationson December 20, 19'Ii4. ibese letters addressed deficiencies incoils on certain Westinghouse relays and improper wiring ofthe Foxboro Reactor Protection System on-line test panel.

Your office was not listed on the letter as receivingcarbon copies. I apologize for any inconvenience this may havecaused, Regulatory Operations.

Cd

/pOCRE(EP

cl USAEC

Very truly yours,

TET:maEnclosure

REGULATORY

PAn. SECaON 6POCKET CLERK

T. E. Tipton HeadNuclear Safe4 andLicensing Section

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December 20> X974

Qoaket Vio. $0-31>~< aDC 50»>2.6

CPPR Ha. 61 and Df'8-$8

U.Be Atomic Zncrg7 CommissionDiroclox'Gte of HeglllatoI'g Operations792G Korfolh. t'avenue

~ Bethesda, ~ary3.end 20&Attentionc Hr~ Donald Fi 1Qmth, MractorGentle~."tens

Pursuant to the regulations of'0GPFtg'O.gy~{o) ve here'~ith..ubmit t: htoxxrx.Seen rocorh ooxxcorntxxg an o<tux,pmexxe Gofict.ency that;occurred during construction at the Don&5 C. Cook fluc3.ear Plant,3ridI;man, l!ichigm.. Unit 1 i" currently operat9.n„, under .xi''COperating license 9Pik-58 aml Uni. 2 is under construction. under~NQ ConsB'uction Pemit No CPIii-. 61.

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The c'equipment de'iciency has been idcntifiod as opencircuited coils on certai'n Ke QtiQP~QI'3e relays {Catalog No '23) 1AOZHgStylo )is E4<49 Coil 177C/72 GGZ 240 VQC) >]1U.ch are u ed. in ylantsefegumds sy"gems. This doficioncy .@as discovered aftor theabove relays hah been in service for approximately 5 months and, .

@as reported. by NET Re 8e ll'unter, Vice 1'resident,ihxcleax'ngineering,merican Flectric i'o~.er dervice Corporation to

Hri Ceci3. Jones in a telephone conversation'on 13eceaber 2, 3.974

An investigation into this deficiency has determinedthat the voltage ratit~g of these pmticular relays i" insufficiontfor all circuit coniitions Although thc voltage rating of 240VDC is sufficient fox'ormal operation of the plant Direct CurrentSysteu<, they »ore placed under voltages of approx'.ately 2GOVDOduring periodic equal%.Dng charging of the plant batteriesRepeated expo ure to this increased volt;age : hich caused ahigher-than-"atcd current fd.o throu,".h the coi3.o resulted moverheating and opening of ttzeso co33. circuits ~

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December 20, 19/4.

Docket :fo. 50-315and 50-316

'CPPB 'No„. '61 and DPH-.58

U.,'3. Atomic Enerpy ComnissionDirectq'rate of Bepulatory Operations79:;0 Norfolk ".venueBethesda~ Haryland <.0$4$

Attention: Hr, Donald F. Knuth, Director

Gentleaen-'ursuantCo the regulations of 10 (TB5'O.g$ (e3,: . ? ere;.'ith

subnit this written report concerning an equip!ment deficiency Ch:..toccurred during construction at Cho Donald C. Coo!< i!uclear Plant,

~ 3ridgman, lQ.chigan. Unit 1 is operating under Liconse Dl'H-q8 m!3Uzd.t 2 is under construction u:vier l;~C construction perL!it CI'P.'".-61.

'he equi.praont deficiency has bean identified as i.apropermiring of the Poxboro ice"ctor Protection System on-line test panel.TM.s eouipmont is "upplied by::lestinghouse- TMs deficiency ~>as

reported by Hr. R. 0- Hunter, Vice President,. nuclear Hngin ering,erican I'lectric Power service Corporation, to Hr ~ Coci1 iones in

'telephone conversation on December 2,

19/4'ignals

from the process sensors, vhich !;",easure various'safety-rolated parallleters are 8'Pocess 8, through Cho PoxboroReactor Protection;-~y"Cea. The on-lin'e test panel is provided Coenable periodic testing of protection circuitry during plantoperation

The difficultyarose because Cho bistable (comparator)output test sw5.tches used are double pole and, therefore, breakboth sides of the output to the load. ~:nile the bistables only brea'.one side. Therefore; certain types of short qircuits could remainundetected. As can oe seen in Pigure 1, a short circuit whichshunts tho hist"bio " itching element '".6 th s"itch contact isundetected. This is true because the return line is opened. Thus

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