ML20091A796

Interim Deficiency Rept Re Westinghouse Type SA-1 Differential Relays.Initially Reported on 840418.Relays Do Not Require Corrective Actions.Deficiencies Will Be Corrected Per Westinghouse Recommendations by Sept 1984

ML20091A796
Person / Time
Site:	Seabrook
Issue date:	05/16/1984
From:	Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE, YANKEE ATOMIC ELECTRIC CO.
To:	Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
SBN-656, NUDOCS 8405300090
Download: ML20091A796 (3)

Text

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m om su m Enginoming Ohm IPUBLIC Companyof New SERVICE HampeNro 1671 Worcester pnad i

1 From'ngham, Massachusetts 01701 (617) - 872 - 8100 May 16, 1984 SBN- 656 T.F. Q2.2.2 United States Nuclear Regulatory Commission

' Region 1 631 Park Avenue King of Prussia, PA 19406 Attention: Mr. Richard ti. Starostecki, Director Division of Project and Resident Programs

References:

(a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b) Telecon of April 18, 1984, G. Tsoudoros (YAEC) to W. R. Borchardt (NRC, Region I)

Subject:

10CFR50.55(e) Report; Westinghouse Type SA-1 Differential Relays

Dear Sir:

On Apr.1 18, 1984, we reported a 10CFR50.55(e) deficiency [ Reference (b)]

regarding Westinghouse Type SA-1 differential relays. The following is our interim report concerning this subject.

Description of Deficiency IE Information Notices 83-63 and 83-63 Supplement I described the following deficiencies, identified in Westinghouse Type SA-1 differential relays:

o Defective silicon-controlled rectifiers (SCR), manufactured by S. T. Semicon for Westingl.ouse. These defective SCRs could cause random trip-out.

o Defective tantalum capacitors. These capacitors, which are part of a printed circuit module, could leak electrolyte, thus affecting integrity of other components in the module, o Insuf ficient Surge Withstand Capability (SWC). This insufficiency could make the relays susceptible to electrical noise with insipient incorrect trip signals.

Safety Implications This type of relay is used in the Seabrook Design and is part of the protection for the emergency diesel generators. The problems identified above could lead to either inadvertent operation of the relay, or malfunction of the relay if it is called to operate; the result could be degradation of the on-site emergency power supply.

8405300090 840516 PDR ADOCK 05000443 8 PDR se a7

m ,

. e United States Nuclear Regulatory Commission _ May 16, 1984 Attention: Mr. Richard W. Starostecki, Director Page 2 Corrective Action The relays used at Seabrook could potentially contain the defective tantalum capacitors, and could be susceptible to electric noise because of insufficient surge' withstand capability.

The relays used at Seabrook do not have SCRs manufactured by S. T.

Semicon, therefore, no corrective action is required for this deficiency.

We plan to correct the applicable deficiencies based on manufacturers' recommendations. Necessary replacement parts have been ordered, and preliminary information indicates long deliveries. Completion of the corrective action is estimated to be September of 1984.

This letter is being filed pursuant to the interim reporting provisions of 10CFR50.55(e)(3).

Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY J. DeVincentis Engineering Manager GTs/kg cc Atomic Safety and Licensing Board Service List Director, Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 I

. o William S. Jordan, III, Esquire Brentwood Board of Selectmen Harmon & Weiss RED Dalton Road 1725 I Street, N.W. Suite 506 Brentwood, New Hampshire 03833 Washington, DC 20006 Roy P. Lessy, Jr., Esquire Office of the Executive Legal Director Edward F. Meany U.S. Nuclear Regulatory Commission Designated Representative of Washington, DC 20555 the Town of Rye l

155 Washington Road Robert A. Backus, Esquire Rye, NH 03870 116 Levell Street P.O. Box 516 Calvin A. Canney Mancehster, NH 03105 City Manager City Hall Philip Ahrens. Esquire 126 Daniel Street Assistant Attorney General Portsmouth, NH 03801 Department of the Attorney General Augusta ME 04333 Dana Bisbee, Esquire Assistant Attorney General Mr. John B. Tanzer Office of the Attorney General Designated Representative of 208 State House Annex the Town of Hampton Concord, NH 03301 5 Morningside Drive Hampton, NH 03842 Anne Verge, Chairperson Board of Selectmen Roberta C. Pevaar Town Hall Designated Representative of South Hampton, NH 03642 the Town of Hampton Talls Drinkwater Road Patrick J. McKeon yn Hampton Falls, NH 03844 Selectmen's Office T ,"

10 Central Road -

Mrs. Sandra Gavutis Rye, NH 03670  ;, .

Designated Representative of i the Town of Kensington ' Carole F. Kagan, Esq. I", n RFD 1 Atomic Safety and Licensing Board Panh1 East Kingston, NH 03827 ~

U.S. Nuclear Regulatory Commissiont ,

Washington, D.C. 20555  :

Jo Ann Shotwell, Esquire ,

Assistant Attorney General Mr. Angie Machiros Environmental Protection Bureau Chairman of the Board of Selectmen Department of the Attorney General Town of Newbury One Ashburton Place, 19th Floor Newbury, MA 01950 Boston, MA 02108 Town Hanagsr's Of fica Senator Gordon J. Humphrey Town Hall - Friend Street U.S. Senate Amesbury, Ma. 01913 Washington, DC 20510 (Attnt Tom Burack) Senator Gordon J. Humphrey 1 Pillsbury Street Diana P. Randall Concord, NH 03301 70 Collins Street (Attnt Herb Boynton)

SEabrook, NH 03874 Richard E. Sullivan, Mayor Donald E. Chick City Hall Town Manager Newburyport, MA 01950 Town of Exeter E;i ' *l ," *. g 10 Tront Street Exeter, NH 03833 LilhifsL i- !I :.C' ;