ML20199H174

Interim Deficiency Rept CDR 85-00-19 Re Misapplication of Potter-Brumfield Type Mdr Relays.Initially Reported on 851216.Rectifier Assemblies Will Be Added to Circuitry to Convert Ac Back to Dc to Operate Dc Solenoid Valves

ML20199H174
Person / Time
Site:	Seabrook
Issue date:	03/31/1986
From:	Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
CDR-85--19, CDR-85-00-19, SBN-982, NUDOCS 8604090309
Download: ML20199H174 (3)

Text

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m p SEABROOK STATION g Engineering Office 5

I MWWb6 March 31, 1986 SBN-982 h Mew Hompshiro Yonkee Divh 3 T.F. Q2.2.2 United States Nuclear Regulatory Commission

_ Region I E 631 Park Avenue King of Prussia, PA 19406

] ' At tention: Mr. Richard W. Starostecki, Director Division of Project and Resident Programa L

References:

(a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b) PSNH Letter SBN-906, dated December 16, 1985, " Interim F 10CFR50.55(e) Report: Misapplication of Potter-Brumfield Type MDR Relays," J. DeVincentis to R. W. Starostecki

Subject:

Interim 10CFR50.55(e) Report: Misapplication of g- Potter-Brumfield Type MDR Relays (CDR 85-00-19)

Dear Sir:

In Reference (b), we reported a 10CFR50.55(e) deficiency regarding Potter-Brumfield Type MDR Relays.

Description of Deficiency The subject relays are a part of the Westinghouse Solid State Protection System (SSPS). Contacts of the relays are used in a number of Valcor de solenoid valve circuits where they must function to interrupt highly inductive de current in order to de-energize the solenoids.

During startup testing of the SSPS, arcing occurred across the MDR relay contacts for the steam dump valves. The heat generated by this arcing subsequently melted a nylon cam in the relay causing the relay not to return to its normal state.

This deficiency in the result of the misapplication of the MDR relay in circuits where it is used to interrupt current beyond its rating. Although p the above described deficiency involved nonsafety-related steam dump valves,

this same deficiency could exist in approximately 19 other Valcor de solenoid valve circuits which are required to perform safety functions.

8604090309 G60331 3 DR ADOCK 0500 PO Box 300 Sootsook,NH03874 . Tetophone[oOJ)474 %21 g

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United States Nuclear Regulatory Commission Attention: Mr. Richard W. Starostecki Page 2 Safety Implications The failure of these safety-related relays could prevent eouipment from performing its intended safety function.

Corrective Action The corrective action associated with this deficiency is to convert these de circuits to ac and take advantage of the higher ac interrupting rating of the_MDR relay contacts. Rectifier assemblies will be added into the circuitry to convert the ac back to de to operate the de solenoid valves. We will inform Region I when the corrective action is completed.

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

Very truly urs, p +.

John DeVincentis, Director Engineering and Licensing cc: Atomic Safety and Licensing Board Service List Director,- Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555

-g.: '

Diane Curran Peter J. Mathews, Mayor Harmon & Weiss City Hall 20001 S. Street, N.W. Newburyport, MA 01950 Suite 430 Washington, D.C. 20009 Calvin A. Canney City Manager Sherwin E. Turk, Esq. City Hall Office of the Executive Legal Director 126 Daniel Street U.S. Nuclear Regulatory Commission Portsmouth, NH 03801 Washington, DC 20555 Stephen E. Merrill Robert A. Backus, Esquire Attorney General 116 Lowell Street Dana Bisbee, Esquire P.O. Box 516 Assistant Attorney General Manchester, NH 03105 Office of the Attorney General 25 Capitol Street Philip Ahrens Esquire Concord, NH 03301-6397 A:sistant Attorney General Department of The Attorney General Mr. J. P. Nadeau Statehouse Station #6 Selectmen's Office Augusta, ME 04333 10 Central Road Rye, NH 03870 Mrs. Sandra Gavutis Designated Representative of Mr. Angie Machiros the Town of Kensington Chairman of the Board of Selectmen' RFD 1 Town of Newbury East Kingston, NH 03827 Newbury, MA 01950 f Jo Ann Shotwell, Esquire Mr. William S. Lord Assistant Attorney General Board of Selectmen Environmental Protection Bureau Town Hall - Friend Street Department of the Attorney General Amesbury, MA 01913 One Ashburton Place, 19th Floor Boston, MA 02108 Senator Gordon J. Humphrey 1 Pillsbury Street Senator Cordon J. Humphrey Concord, NH 03301 U.S. Senate (ATTN: Herb Boynton)

Washington, DC 20510 (ATTN: Tom Burack) H. Joseph Flynn

! Office of General Counsel Diana P. Randall Federal Emergency Management Agency j

i 70 Collins Street 500 C Street, SW Seabrook, NH 03874 Washington, DC 20472 Richard A. Hampe Esq. Matthew T. Brock, Esq.

Hampe and McNicholas Shaines, Madrigan & McEachern 35 Pleasant Street 25 Maplewood Avenue Concord, NH 03301 P.O. Box 360 Portsmouth, NH 03801 Donald E. Chick Town Manager Gary W. Holmes, Esq.

Town of Exeter Holmes & Elis

! 10 Front Street 47 Winnacunnet Road

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! Brentwood Board of Selectmen Ed Thomas j RFD Dalton Road FEMA Region I

! Brentwood, NH 03833 John W. McCormack PO & Courthouse I Boston, MA 02109 l

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