ML20042H031

Discusses Steam Generator Safety Assessment.Concludes That Continued Operation Through Remainder of Current Cycle 10 Fully Justified

ML20042H031
Person / Time
Site:	Millstone
Issue date:	05/09/1990
From:	Mroczka E NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	Martin T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
B13526, NUDOCS 9005170093
Download: ML20042H031 (2)

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c,% ww%..c"*' P.O. BOX 270 HARTFORD, CONNECTICUT 06141-0270 k k J 7[, $$$C.C, (203)665-5000 May 9, 1990 Docket No. 50-336 B13526 Re: S/G Safety Assessment Mr. Thomas T. Martin Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406

Dear Mr. Martin:

Millstone Nuclear Power Station, Unit No. 2 Steam Generator Safety Assessment In a lotter dated February 7, 1990,II) Northeast Nuclear Energy Company (NNECO) submitted the latest steam generator (S/G) eddy-current testing results and an overall safety assessment of the Millstone Unit No. 2 S/Gs as a result of the in-cycle outage in October 1989. On February 22, 1990, NNEC0 met with the NRC Staff to discuss the results of the in-cycle outage and the February 7, 1990 letter. A letter dated March 22,1990.gmaryofthatmeetingwasissuedbytheNRCina During the February 22, 1990 meeting, NNECO informed the NRC Staff of ongoing efforts to perform further burst tests on sample S/G tube.c and, as a result, committed to submit an analysis based upon the results of those burst tests.

Subsequently, in a telephone conversation on May 2, 1990 with the NRC Project Manager for Millstone Unit No. 2, it was requested that NNECO submit by May 14 a brief description of our corporate position regarding operation until the scheduled refueling outage. Based on this conversation and subsequent discus-sions with the Staff on May 8, 1990, the detailed bases for our corporate position will follow in a subsequent letter and/or a meeting with the Staff.

4 (1) E. J. Mroczka letter to W. T. Russell, " Millstone Nuclear Power Station, Unit No. 2, Steam Generator Inspection," dated February 7, 1990.

(2) G. S. Vissing letter to Northeast Utilities, Millstone Unit No. 2, ^

" Summary of Meeting with Representatives of Northeast Utilities Concerning the October 1989 Mid-Cycle Steam Generator Tube Inspection at Millstone 2, February 22, 1990," dated March 22, 1990.

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U.S.-Nuclear Regulatory Commission B13526/Page 2 May 9,.1990 3

! NNEC0 has extensively reviewed.the results_ of the burst tests performed by: '

Combustion Engineering and the additional analytical evaluations performed by  ;

our consultant and our staff. - The-overall conclusion submitted to the Staff in our February 7, 1990 letter and presented to the Staff at the February 22, l

1990. meeting, remains _ unchanged. That is, continued operation through the i

remainder of the current Cycle'10 is fully justified. The bases for that conclusion will be further detailed _ in a subsequent submittal and/or meeting with the Staff.

Should you need. additional information or ' clarification, please contact us. -

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY d

l Senbr reside t cc: G. S. Vissing, NRC Project Manager, Millstone Unit No. 2 l

W. J. Raymond, Senior Resident Inspector, Millstone Unit _Nos. 1, 2, and 3 l U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 1

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