ML20083J001

Interim Deficiency Rept Re Hea Relays Mfg by Ge.Initially Reported on 831121.Investigation Continuing to Determine If Relays Supplied to Facility.Final Rept Will Be Submitted by 840731

ML20083J001
Person / Time
Site:	Nine Mile Point
Issue date:	12/21/1983
From:	Mangan C NIAGARA MOHAWK POWER CORP.
To:	Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
7843, NUDOCS 8401160100
Download: ML20083J001 (5)

Text

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U V NIAGARA R uMOHAWK NIAGARA MOHAWK POWER CORPORATION /300 ERIE BOULEVARD WEST. SYRACUSE, N Y.13202/ TELEPHONE (315) 474-1511 December 21, 1983 (7843) l Mr. R. W. Starostecki, Director U.S. Nuclear Regulatory Commission Region I Division of Project and Resident Programs 631 Park Avenue i

King of Prussia, PA 19406 l

Re: Nine Mile Point Unit 2 Docket No. 50-410

Dear Mr. Starostecki:

Enclosed is an interim report for the problem concerning HEA Relays manufactured by General Electric.

This problem was reported via telecon to Mr. R. Gallo of your staff on November 21, 1983.

Very truly yours, C

Vice President Nuclear Engineering & Licensing CVM/TL:ja Enclosure xc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 Mr. R. Gram, Resident Inspector 1

8401160100 831222 gDRADDCK 05000410

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l NIAGARA M0 HAWK POWER CORPORATION NINE MILE POINT - UNIT 2 DOCKET N0. 50-410 Interim Report for a Problem Concerning HEA Relays Description of the Problem General Electric letter dated October 14,1983 (enclosed) stated that some of the HEA relays manufactured between September 1980 and August 1983 may malfunction due to the reasons explained in this letter.

We are investigating the matter to determine if the relays in question have been supplied to Nine Mile Point - Unit 2.

A final report will be submitted by July 31, 1984.

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G E N E R A L (h E L E C T R I C

.r-NT/JRATUS AND COGNiER:N'., Si41Ct5 OPiFAllONS GE:.!W t:ICitC CCr.PNw

• 353" Jw.E5 5 W ET. P O SDX :541

• SrPACUS!. NEW YOK 13t'n October 14, 1983 cc:

E. Schaible Ilavid Nims Operations A4 NIAGAPA moi!N.iK POWER CORPORATION i

300 Eric Blvd. West l

Syracuse, hT 13202 i

SUBJECT:

SERVICE ADVICE 721PSM-175.1 IlEA F.ELAY MISOPEPJ.TIO'N i.

Cent]emen:

We have received a customer report of an hEA relay mis-operation which happened when the panel door, on which the relay was neunt ed, was closed.

Our investigation of the ret urned unit has shcun ths.t this calfunction is the result of a cembination of tolerances, with an extremely low probability of occurrin;;,

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and is linhed to a minor design change which was impicnented in

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October 1980.

This change was made to increase the relay's capability to operate at redveed voltages.

The re-designed relay was extensively tested the time because this change would tend to reduce the cargin against :r.is-at operatien due to shock and vibration.

A test program uas conducted which verified that the re-designed relay met the published seismic capability.

};ey tolerances will be changed to correct the condition reported by the cust*-

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omer, and we have institut ed a racchanical tr'p test in our factory.

A series of tests perforned to correlate seismic capability with the force required to trip the rela) has been used to establish the factory force limit.

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Ue rece.m.end that all HEA rel.ays n:anufactured between September 1980 and Aug-ust 1983, cc,rresponding to da t e codes 1:S, LS, MS, AT through MT, AU through 1:U, and AW through 11W, should be checked to determine the force, applied at I

the armature, to trip the relay.

This force sh:.uld be cheched by app 1'ying a r.eu.ur-able force perpendicular 'to the armature at the arnature rivet above the pole

s piece as shown in Figure 1.

(Attached)

-Any relay requiring a force less than 500 grans cr 1.1 pounds should be consid-ered out of specification.

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.kN RECElVED

-J Q i6 7 f ! $ '

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bU V OCT 1 Y 1983 21 Oc11 M:23*

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-w SYSTEl,; f,iEIER T, TEST h,\\

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G E N E R A L,9 E L E C T R I C

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It is rece nended that any 1!EA relay, with the above date codes, that does

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not teet the above specification be replaced.

In the even: that your t est discloses such a relay, please contact your Central Electric sales of fice to order a new relay on a no charge basis.

In ar.d out costs are not to be charged to the General Electric Company.

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f Recuests for replacceent HEA relays should include:

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Catalog number and date code of the HEA relay.

2.

F.ec;uisition number and purchese order under which the orgir.a1 relay was furnished.

3.

'..:: lear dn=a;;e usiver for any relay ordered for installation at any nuclear ci c.

Thic of fer will renir. avsi3able until September 30, 1984.

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with tuo "T" stamps adjacent to the date code sticker.

This second "T" On non-II applicctions, r epla c e.=cn t relays may be shipped to customers

- stamp is a verification that warehouse stocked relays were re-checked to r.ake sute they were built to specification.

If you have any cuestions, please f eel free to contact me.

Sincerely, a

C

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Stephen C.

Zeder Actin; Service Supervisor SCZ/dlk Attachr.ent O

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