ML18219C135

Letter from American Electric Power Service Corp to NRC Forwarding Letters Sent Addressing Deficiencies in Coils on Certain Westinghouse Relays & Improper Wiring of Foxboro Reactor Protection System On-Line Test Panel

ML18219C135
Person / Time
Site:	Cook
Issue date:	01/21/1975
From:	Tipton T American Electric Power Service Corp
To:	James Keppler NRC/RGN-III
References
Download: ML18219C135 (14)

Text

AEC DISTRI i IG I FOR PART 50 DOCVET f,IAAF IAL (TEi'iPORARY FOAi'.I)'ONTROL NO: FILE: FRp;~.American Elec;Power NY, NY 10004 T.ED Ti ton DATE OF DOC DATE REC'D 1 2 LTR~I~I\~I vow RPT OTHcR'O: Region III, Keppler ORIG 1 signed CC OTHER SENT AEC'PDR SENT LOCAL PDR CLASS UN CLASS XXXXX D ESCR I P7 I Q N: PROPINFO INPUT NO CYS RFC'D 1 signed ENCLOSURES:

OC.,ET No: 0-3 S16 Ltr trans.copies of ltrs sent to Knuth re: deficiencies in coils on certain Westinghouse relays and improper wiring of the Foxboro Reactor Protection System on>>line test panel.PLANT NA11E: Cook 1&2 BUTLER (S)W/Copies.CLARK (S)g/Copies PARR (S)/Copies KNIEL (S)~N/Copies SCHWENCER (S)W/Copies.STOLZ (S)W/Copies vASSALLo (s)W/Copies PURPLE (S)W/Copies EG FI TECH REVIEW@GC, ROOM P-506-A+iIACCARRY

~L OSSICK/STAFF MIGHT SQASE 8'A>ILICKI GIAI BUS SO BOYD@TELLO MOORB (S)(BHR)HOUSTON DEYOUNG (S)(PI/IR)WlOVAK SKOVHOLT{S)0%0SS GoLLEl~(s)'PP0LITO P~COLI INS TEDESCO DENXSE~4NG REG OPR EAINAS~~ILE'REGXON QQ CENAROYA i.R.WILSON~STEELE~VOLIMER.ZIEMANN (S)W/Copies DXCKER (E)W/Copies KNIGHTON{E)$1/Copies YOUNGBLOOD (E)W/Co ies INTERNAL DISTill)U DE NEON GRIME S GAMMILL 4KASTNER BALLARD SPANGLER ENUIRO MULLER.DXCKER KNIGHT OH YOUNGBLOOD REGAN PROJECT LDR HARLESS REGAN (E)*M/Copies LEAR (S)W/Copies SPEXS (S)W/Copies 7 ION LIC.ASSI.~AI IND DIGGS (S)BRAITMAN GEARIN (S)SALTZMAN GOULBOURNE (S)B.HURT KREUTZER (E)LEE (S)PLANS MAIGRET (S)MCDDNALD EED{E)CHAPMAN SERVXCE (S)DUBE w/input'HEPPARD (S)E.COUPE SLIT',ER (E)'.Hirtf ield (2)SMITH (S)~KLEGJKR'TEETs (s)YF.wILLIAMs WILLIAMS (E)WILSON (S)INGRAM (S).Ii E>:TER~."LL DISTR IEUTIOM N=~4.<<TIC (ABERNATHY)(Pi-NS IC (BUCHANAN) 1<<.ASLB"NEIITON ANDERSON'-ACRS SENT,TO, LXC~ASST.QC.rVtC4 fŽ49=7+(1)(2)(10)"NATXONAL LABS 1<<1'..PENNX lGTON, RM E-201 G.T~1"CONSULTANTS NEWAARK/BLUHE/ASBABIAN 1-PDR SAN/LA/NY 1 BROOKHAVEN NAT LAB 1<<G~ULRXKSON, ORNA 1>>AGMED(RUTH GUSSMAN)RM B>>127 G.T.,1-J~RUNKLES, RM E-201 G.T.

t s 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 Commission Directorate of Regulatory Operations Region IXX 799 Roosevelt Road Glen Ellyn, Illinois 60137 Attention:

Mr.James G.Keppler Re ional Director Gentlemen:

Enclosed are copies of letters sent to Mr.Donald F.Knuth, Director, Directorate of Regulatory Operations on December 20, 19'Ii4.ibese letters addressed deficiencies in coils on certain Westinghouse relays and improper wiring of the Foxboro Reactor Protection System on-line test panel.Your office was not listed on the letter as receiving carbon copies.I apologize for any inconvenience this may have caused, Regulatory Operations.

Cd/pOCRE(EP cl USAEC Very truly yours, TET:ma Enclosure REGULATORY PAn.SECaON 6 POCKET CLERK T.E.Tipton Head Nuclear Safe4 and Licensing Section cc: R.S.Hunter/S.J.Milioti G.E.Lien S.Je Trippy-Bridgman AEC Letter Pile

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~~~e~AEC Letter File x h~.December 20>X974 Qoaket Vio.$0-31>~<aDC 50>>>2.6 CPPR Ha.61 and Df'8-$8 U.Be Atomic Zncrg7 Commission Diroclox'Gte of HeglllatoI'g Operations 792G Korfolh.t'avenue~Bethesda,~ary3.end 20&Attentionc Hr~Donald Fi 1Qmth, Mractor Gentle~."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.xiC Operating license 9Pik-58 aml Uni.2 is under construction.

under~NQ ConsB'uction Pemit No CPIii-.61.4 The c'equipment de'iciency has been idcntifiod as open circuited coils on certai'n Ke QtiQP~QI'3e relays{Catalog No'23)1AOZHg Stylo)is E4<49 Coil 177C/72 GGZ 240 VQC)>]1U.ch are u ed.in ylant sefegumds sy"gems.This doficioncy

.@as discovered aftor the above 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 determined that the voltage ratit~g of these pmticular relays i" insufficiont for all circuit coniitions Although thc voltage rating of 240 VDC is sufficient fox'ormal operation of the plant Direct Current Systeu<, they>>ore placed under voltages of approx'.ately 2GOVDO during periodic equal%.Dng charging of the plant batteries Repeated expo ure to this increased volt;age: hich caused a higher-than-"atcd current fd.o throu,".h the coi3.o resulted m overheating and opening of ttzeso co33.circuits~e'3 2975 1~~~

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)v~C Letter Pile'December 20, 19/4.Docket:fo.50-315 and 50-316'CPPB'No.'61 and DPH-.58 U.,'3.Atomic Enerpy Comnission Directq'rate of Bepulatory Operations 79:;0 Norfolk".venue Bethesda~Haryland<.0$4$Attention:

Hr, Donald F.Knuth, Director Gentleaen-'ursuant Co the regulations of 10 (TB5'O.g$(e3,:.?ere;.'ith subnit this written report concerning an equip!ment deficiency Ch:..t occurred during construction at Cho Donald C.Coo!<i!uclear Plant,~3ridgman, lQ.chigan.

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

'he equi.praont deficiency has bean identified as i.aproper miring 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 Poxboro Reactor Protection;-~y"Cea.

The on-lin'e test panel is provided Co enable periodic testing of protection circuitry during plant operation The difficulty arose because Cho bistable (comparator) output test sw5.tches used are double pole and, therefore, break both sides of the output to the load.~:nile the bistables only brea'.one side.Therefore; certain types of short qircuits could remain undetected.

As can oe seen in Pigure 1, a short circuit which shunts tho hist"bio" itching element'".6 th s"itch contact is undetected.

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