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:

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FRp;~. American Elec; Power DATE OF DOC DATE REC'D LTR

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'O: 1 2 ORIG CC OTHER SENT AEC'PDR Region III, Keppler 1 signed SENT LOCAL PDR CLASS UN CLASS PROPINFO INPUT NO CYS RFC'D OC.,ET No:

XXXXX 1 signed 0-3 S16 D ESCR P7 I Q N:

I ENCLOSURES:

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.

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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.

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/ Very truly yours, pOCRE(EP cl USAEC REGULATORY 6

T. E. Tipton Head PAn. SECaON POCKET CLERK Nuclear Safe4 and Licensing Section TET:ma Enclosure cc: R. S. Hunter/S. J. Milioti G. E. Lien S. Je Trippy - Bridgman AEC Letter Pile

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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 circuited coils on certai'n Ke QtiQP~QI'3e relays {Catalog No open '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, merican Flectric i'o~.er dervice Corporation to ihxcleax'ngineering, 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 ~

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~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,

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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, process sensors, vhich !;",easure various 19/4'ignals from the

'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. This is true because the return line is opened. Thus

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