ML20237G717

Forwards Safety Evaluation Re Util 860123,870706 & 31 Submittals Concerning Pts.Estimated Value of Fast Neutron Fluence to Pressure Vessel to Have Conservative Error Margins & Acceptable

ML20237G717
Person / Time
Site:	Millstone
Issue date:	08/24/1987
From:	Jaffe D Office of Nuclear Reactor Regulation
To:	Mroczka E NORTHEAST NUCLEAR ENERGY CO.
Shared Package
ML20237G719	List: ML20237G717 ML20237G728
References
TAC-59964, NUDOCS 8709020382
Download: ML20237G717 (2)

Text

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AUG 24 Docket No. 50-336 Mr. Edward J. Mroczka Senior Vice President Nuclear Engineering and Operations

, Northeast Nuclear Energy Company P. O. Box 270 Hartford, Connecticut 06141-0270

SUBJECT:

PRESSURIZED THERMAL SH0CK, 10 CFR 50.61 (TAC #59964)

We have completed our review of your submittals for Millstone Unit 2, dated January 23, 1986, July 6, 1987 and July 31, 1987 concerning Pressurized Thermal Shock. 4 Based upon our evaluation, we find that the estimated value of the fast l neutron fluence to the pressure vessel to have conservative error margins and thus is acceptable. The value of the RT based on this fluence estimate is lessthanthe10CFR50.61screeningcribionandisacceptable. In addition, the controlling material has been properly identified. The justifications given for copper and nickel contents and the initial RT are acceptable. The margin has been derived from consideration of the baskTfor ,

these values, following the PTS Rule,'Section 50.61 of 10 CFR Part 50.

The staff concludes, based on the considerations discussed above, that the Millstone 2 plant satisfies the fracture toughness requirements for protection against pressurized thermal shock.

Sincerely, David H. Jaffe, Project Manager Project Directorate I-4 Division of Reactor Projects I/II

Enclosure:

As stated '

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Mr. Edward J. Mroczka Millstone Nuclear Pcwer Station l 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 U.S. Nuclear Regulatory Consnission Office of Executive Director for Operations 631 Park Avenue -

King of Prussia, "annsylvania 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 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 06141-0270 Kevin McCarthy, Director Radiation Control Unit  :

Department of Environmental Protection State Office Building Hartford, Connecticut 06106 l

Mr. Theodore Rebelowski U.S. NRC P. O. Box 615 Waterford, Connecticut 06385-0615 Office of Policy & Management l ATTN: Under Secretary Energy 1 Division '

80 Washington Street Hartford, Connecticut 06106 '

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