ML20148K225

Responds to NRC Bulletin 88-001, Defects in Westinghouse Circuit Breakers. Two Reactor Trip Breakers & Two Reactor Trip Bypass Breakers Subj to Bulletin Used at Millstone Unit 3.Main Pole Shaft Weld Insps Completed by 880225

ML20148K225
Person / Time
Site:	Millstone, Haddam Neck, 05000000
Issue date:	03/25/1988
From:	Mroczka E CONNECTICUT YANKEE ATOMIC POWER CO., NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	Russell W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
A07039, A7039, IEB-88-001, IEB-88-1, TAC-65955, TAC-65956, NUDOCS 8803310043
Download: ML20148K225 (2)

Text

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• General Offkes

• Selden Street. Berlin, Connecticut 1 Ori7SUIeNcow.~ P.O. BOX 270 g '

NE)',7.'ES ,, " HARTFORD. CONNECTICUT 061410270 J s w i =<u .i m .co ,.a- (203) 665-5000 March 25, 1988 Docket Nos. 50 213 50-245 50-336 50-423 A07039 Re: NRC Bulletin 88-01, TACS 65955/65956 Mr. William T. Russell, Regional Administrator Region I Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406

References:

(1) NRC Bulletin No. 88-01, "Defects in Westinghouse Circuit Breakers", dated February 5, 1988.

(2) Westinghouse Technical Bulletin, NSID-TB-87-11, "Westinghouse Circuit Breakers Type DS/DSL:

Welds on Breaker's Pole Shaft", dated December 1, 1987.

Gentlemen:

Haddam Neck Plant Millstone Nuclear Power Station, Unit Nos. 1, 2 and 3 Response to NRC Bulletin No. 88-01 using Westinghouse DS-206, Reference (1) requires licensees DSL-206, DS-416, DSL-416, and DS-420 circuit breakers in Class 1E applications to perform certain inspections described in Refer-ence (2) and amended by Reference (1). Connecticut Yankee Atomic Power Company (CYAPCO) and Northeast Nuclear Energy Company (NNECO) hereby inform the NRC Staff that the only such breaker applications in any Northeast Utilities operated nuclear unit are the two reactor trip breakers and the two reactor trip bypass breakers at Millstone Unit No. 3 for a total of four (4) breakers, which are Model DS-416.

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8803310043 880325 PDR ADOCK 05000213 o DCD i

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Mr. Willia 3 T. Russell A07039/ Pag 3 2 March 25, 1988 The 30-day inspection of the three main pole shaft welds for the Millstone Unit No. 3 reactor trip breakers (both main and bypass) was completed by February 25, 1988. All four breakers failed to meet the acceptance criteria 6.1.1.a and 6.1.1.b of Reference (2). However, they did meet all of the acceptance criteria 6.1.2 as amended by Reference (1). These breakers will continue to be inspected as required by section 6.2.2 until the pole shafts have been replaced. The long term inspection will be completed prior to the restart following the second refueling outage, which is currently scheduled to start in June 1989.

The results of the long term inspection will be submitted to you within 30 days of the inspection. If there are any further questions, please do not hesitate to contact my staff.

Very truly yours, i CONNECTICUT YANKEE ATOMIC POWER COMPANY NORTHEAST NUCLEAR ENERGY COMPANY

, lW E . W.ycfcfz kaf Senior Vice President STATE OF CONNECTICUT )

) ss. Berlin COUNTY OF HARTFORD )

Then personally appeared before me, E. J. Mroczka, who being duly sworn, did state that he is Senior Vice President of Connecticut l Yankee Atomic Power Company and Northeast Nuclear Energy Company, Licensees herein, that he is authorized to execute and file the foregoing information in the name and on behalf of the Licensees herein, and that the statements contained in said information are j true and correct to the best of his knowledge and belief.

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U.S. Nuclear Regulatory Commission

! Document Control Desk Washington, D.C. 20555 A. B. Wang, NRC Project Manager, Haddam Neck Plant M. L. Boyle, NRC Project Manager, Millstone Unit No. 1 i D. H. Jaffe, NRC Project Manager, Millstone Unit No. 2 R. L. Ferguson, NRC Project Manager, Millstone Unit No. 3 W. J. Raymond, Senior Resident Inspector, Millstone Unit l Nos. 1, 2 and 3 J. T. Shedlosky, Resident Inspector, Haddam Neck Plant