ML20134P417

Discusses Conclusions & Forwards Safety Evaluation Re 1985 Steam Generator Tube Insps & Repair,Per 850501 Meeting W/Util & Util 850612 & 0712 Ltrs Concerning Eddy Current Testing & Tube Repair

ML20134P417
Person / Time
Site:	Millstone
Issue date:	08/19/1985
From:	Butcher E Office of Nuclear Reactor Regulation
To:	Opeka J NORTHEAST NUCLEAR ENERGY CO.
Shared Package
ML20134P421	List: ML20134P417 ML20134P422
References
TAC-57598, NUDOCS 8509060301
Download: ML20134P417 (2)

Text

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August 19, 1985 Docket No. 50-336 Distribution: + Docket E11e NRC & L PDRs Branch Files PKreutzer EButcher D0sborne HThompson Mr. John F. Opeka, Senior Vice President ACRS 10 Glainas Nuclear Engineering and Operatic.s GHolahan EJordan Northeast Nuclear Energy Company BGrimes OELD P. O. Box 270 HConrad FWitt Hartford, Connecticut 06141-0270 JMinns

SUBJECT:

1985 STEAM GENERATOR TUBE INSPECTIONS AND REPAIR AT MILLSTONE UNIT 2 Using information from the May 1, 1985 meeting between our staffs and your June 12, 1985 and July 12, 1985 letters concerning the results of eddy current testing and subsequent repair of steam generator tubes at Millstone 2, we conclude the following:

1.

A more valid eddy current inspection of the steam generator tubes was possible due to the effective removal of copper deposits via chemical cleaning.

2.

There is reasonable assurance that the chemical cleaning process did not cause further pitting corrosion of the Inconel 600 tubing.

3.

Our December 30, 1983 evaluation approving sleeving as an acceptable method of steam generator tube repair remains valid.

Details of these conclusions are contained in the enclosed Safety Evaluation.

You have stated that pitting is expected to greatly decrease as a result of aggressive countermeasures which are expected to greatly improve the " local-chemistry environment" responsible for the pitting. The effectiveness of these countermeasures should be addressed in accordance with the reportng requirements of the Technical Specifications.

Sincerely,

/S/

Edward J. Butcher, Acting Chief Operating Reactors Branch No. 3 Division of Licensing

Enclosure:

As stated cc w/ enclosure:

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Mr. John F. Opeka Millstone Nuclear Power Station i

Northeast Nuclear Energy Company Unit No. 2 CC:

Gerald Garfield, Esq.

Mr. Wayne D. Romberg Day, Berry & Howard Superintendent Counselors at Law Millstone Nuclear Power Station City Place P. O. Box 128 Hartford, Connecticut 06103-3499 Waterford, Connecticut 06385 Regional Administrator, Region I Mr. Edward J. Mroczka U.S. Nuclear Regulatory Commission Vice President, Nuclear Operations Office of Executive Director for Northeast Nuclear Energy Company Operations P. O. Box 270 631 Park Avenue Hartford, Connecticut 06101 King of Prussia, Pennsylvania 19406 Mr. Charles Brinkman, Manager Washington Nuclear Operations C-E Power Systems Combustion Engineering, Inc.

7910 Woodmont Avenue Bethesda, Maryland 20814 Mr. Lawrence Bettencourt, First Selectman c

Town of Waterford Hall of Records - 200 Boston Post Road Waterford, Connecticut 06385 Northeast Utilities Service Company ATTN: Mr. Richard R. Laudenat, Manager Generation Facilities Licensing Post Office Box 270 Hartford, Connecticut 06101 Arthur Heubner, Director Radiation Control Unit Department of Environmental i

Protection i

State Office Building Hartford, Connecticut 06116 Mr. John Shedlosky Resident Inspector / Millstone Box 811 Niantic, Connecticut 06357 Office of Policy & Management ATTN: Under Secretary Energy Division 80 Washington Street Hartford, Connecticut 06115

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