ML20043E863
| ML20043E863 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 06/08/1990 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Mroczka E CONNECTICUT YANKEE ATOMIC POWER CO., NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| TAC-76880, NUDOCS 9006130471 | |
| Download: ML20043E863 (2) | |
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l June 8, 1990 Dgeket No. 50-336 DISTRIBUTION
<DetNCFile l
NRC & Local PDRs Plant File i
S. Norris G. Vissing Mr. Edward J. Mroczka E. Jordan (MNBB3302)J.Stolz l
ACRS(ger(14A2) l Senior Vice President S. Varga(14E4)
B. Bo Nuclear Engineering and Operations OGC 10) i Connecticut Yankee Atomic Power Company E. Wenzinger, RI I
Northeast Nuclear Energy Company P. O. Box 270 Hartford, Connecticut 06141-0270
SUBJECT:
AUTHORIZATION OF USE OF ALLOY 690 AS ALTERNATIVE TO USE OF ALLOY 600 FOR STEAM GENERATOR TUBE PLUGS PER 10 CFR 50.55a(a)(3)(TAC NO. 76880)
By letter dated June 5,1990, you requested to use plugs fabricated of nickel-chromium-iron UNS N-06690 material (Alloy 690) as an alternative to Alloy 600 to plug tubes in the steam generators of Millstone Unit No. 2.
I The Alloy 690 material has mechanical properties similar to Alloy 600 and has superior corrosion resistance properties. The NRC Staff endorsed the use of r
the Alloy 690 for fabrication of mechanical plugs for steam generator tubes in NRC Bulletin No. 89-01," Failure of Westinghouse Steam Generator Tube Mechanical Plugs," May 15, 1989.
Based on the above, Alloy 690 in product form SB166 is l
acceptable as an alternative to the use of Alloy 600.
l We have reviewed your request and supporting information and conclude that the l
use of Alloy 690 in product form SB166 as a proposed alternative to the use of Alloy 600, will provide an acceptable level of quality and safety and, therefore, its use for plugs to plug tubes in steam generators is authorized under the provisions of 10 CFR 50.55a(a)(3)
Sincerely, f
/s/
John F. Stolz, Director Project Directorate I-4 i
Division of Reactor Projects - 1/II l
Office of Nuclear Reactor Regulation l
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,- Mr. Edward J. Mroczka Millstone Nuclear Power Station Northeast Nuclear Energy Company Unit No. 2 cc:
Gerald Garfield, Esquire R. M. Kacich, Manager Day, Berry and Howard Generation Facilities Licensing
-Counselors at Law Northeast Utilities Service Company City Place Post Office Box 270 Hartford,-Connecticut 06103-3499 Hartford, Connecticut 06141-0270 W. D.-Romberg, Vice President D. O. Nordquist Nuclear Operations Director of Quality Services Northeast Utilities Service Company Northeast Utilities Service Company Post Office Box 270 Post Office Box 270 Hartford, Connecticut 06141-0270 Hartford, Connecticut 06141-0270 Kevin McCarthy, Director Regionel Administrator Radiation Control Unit Region !
j Department of Environmental Protection U. S. Nuclear Regulatory Comission State Office Building 475 Allendale Road Hartford, Connecticut 06106 King of Prussia, Pennsylvania 19406 Bradford S. Chase, Under Secretary First Selectmen Energy Division Town of Waterford i
Office of Policy and Management
-Hall of Records 80 Washington Street 200 Boston Post Road Hartford, Connecticut 06106 Waterford, Connecticut 06385 S. E. Scace, Nuclear Station Director W. J. Raymond, Resident Inspector Millstone Nuclear Power Station Millstone Nuclear Power Station Northeast. Nuclear Energy Company c/o U. S. Nuclear Regulatory Comission Post Office Box 128 Post Office Box 811 Waterford, Connecticut 06385 Niantic. Connecticut 06357 J. S. Keenan, Nuclear Unit Director Charles Brinkman, Manager Millstone Unit No. 2 Washington Nuclear Operations Northeast Nuclear Energy Company C-E Power Systems Post Office Box 128 Combustion Engineering, Inc.
Waterford. Connecticut 06385 12300 Twinbrook Pkwy Suite 330 Rockville, Maryland 20852 I