ML13322B194
| ML13322B194 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 07/27/1990 |
| From: | Larkins J Office of Nuclear Reactor Regulation |
| To: | Ray H Southern California Edison Co |
| References | |
| TAC-77174, TAC-77175 IEB-89-001, IEB-89-1, NUDOCS 9008020185 | |
| Download: ML13322B194 (2) | |
Text
July 27, 1990 Docket No. 50-206 and 50-361 Mr. Harold B. Ray Mr. Gary D. Cotton Senior Vice President Senior Vice President Southern California Edison Co.
Engineering and Operations Irvine Operations Center San Diego Gas & Electric Co.
23 Parker Street 101 Ash Street Irvine, California 92718 San Diego, California 92112 Gentlemen:
SUBJECT:
AUTHORIZATION FOR USE OF ALLOY 690 AS AN ALTERNATIVE TO ALLOY 600 IN STEAM GENERATOR TUBE PLUGS IN ACCORDANCE WITH 10 CFR 50.55a(a)(3)
(TAC NOS. 77174 AND 77175)
By letter dated July 24, 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 San Onofre Nuclear Generating Station, Unit Nos. 1 and 2.
The Alloy 690 material has mechanical properties similar to Alloy 600 and has superior corrosion resistance properties. The NRC staff endorsed the use of 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. Moreover, by letter dated June 28, 1990, the staff approved the use of Alloy 690 plugs for the steam gnerators at San Onofre Nuclear Generating Station, Unit No. 3.
We have reviewed your request and supporting information and conclude that the use of Alloy 690 in the requisite product forms as a proposed alternative to the use of Alloy 600, will provide an acceptable level of quality and safety.
Therefore, based on the above, Alloy 690 in the requisite product forms is acceptable as an alternative to the use of Alloy 600 and its use for plugging tubes in steam generators is authorized under the provisions of 10 CFR 50.55a(a)(3).
Sincerely, Original Signed By:
John T. Larkins, Acting Director Project Directorate V Division of Reactor Projects -
- III, IV, V and Special Projects Office of Nuclear Reactor Regulation cc:
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Messrs. Ray and Cotton San Onofre Nuclear Generating Southern California Edison Company Station, Unit No. 1 and 2 cc David R. Pigott Charles R. Kocher, Esq.
Orrick, Herrington & Sutcliffe James A. Beoletto, Esq.
The Old Federal Reserve Bank Bldg.
Southern California Edison Company 400 Sansome Street Irvine Operations Center San Francisco, California 94111 23 Parker Irvine, California 92718 Mr. Robert G. Lacy Manager, Nuclear Mr. Charles B. Brinkman San Diego Gas & Electric Company Combustion Engineering, Inc.
P. 0. Box 1831 12300 Twinbrook Parkway, Suite 300 San Diego, California 92112 Rockville, Maryland 20852 Resident Inspector/San Onofre NPS Alan R. Watts, Esq.
U.S. NRC Rourke & Woodruff P. 0. Box 4329 702 S. Parker St. No. 7000 San Clemente, California 92672 Orange, California 92688-4702 Mayor Mr. Sherwin Harris City of San Clemente Resource Project Manager San Clemente, California 92672 Public Utilities Department City of Riverside Chairman 3900 Main Street Board of Supervisors Riverside California 92522 County of San Diego 1600 Pacific Highway Room 335 Mr. Phil Johnson San Diego, California 92101 U.S. Nuclear Regulatory Commission Region V Regional Administrator, Region V 1450 Maria Lane, Suite 210 U.S. Nuclear Regulatory Commission Walnut Creek, California 94596 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Mr. Richard J. Kosiba, Project Manager Bechtel Power Corporation Mr. John Hickman, Senior Health 12440 E. Imperial Highway Physicist Norwalk, Caliofornia 90650 Environmental Radioactive Mgmt. Unit Environmental Management Branch State Department of Health Services 714 P Street, Room 616 Sacramento, California 95814 Mr. Don Womeldorf Chief, Environmental Management California Department of Health 714 P Street, Room 616 Sacramento, California 95814