ML20148E074

Advises That Although NRC Has Not Yet Finalized Review of Acceptability of Using Increased Yield Strength of 46 Ksi for A500 Grade B Tube shapes,42 Ksi Yield Strength at 100 F Can Be Used W/O Risk to Public,Per Util 871026 Request

ML20148E074
Person / Time
Site:	Comanche Peak
Issue date:	01/15/1988
From:	Charemagne Grimes NRC OFFICE OF SPECIAL PROJECTS
To:	Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
References
NUDOCS 8801250558
Download: ML20148E074 (4)

Text

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UNITED STATES NUCLEAR REGULATORY COMMISSION r,.

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January 15, 1988 Docket Nos. 50-445 and 50-446 Mr. William G. Counsil Executive Vice President Texas Utilities Electric Company 400 North Olive Street, Lock Box 81 Dallas, Texas 75201

SUBJECT:

USE OF ASME CODE CASE N-71 REVISION 15 The staff has completed its evaluation of your request dated October 26, 1987 (TXX-6628) to use a yield strength value of 42 ksi for selected pipe supports fabricated from A500 Grade 8 (cold-formed) structural tube shapes.

The staff understands that generally the pipe supports at the Comanche Peak Steam Electric Station, Units 1 and 2, fabricated from A500 Grade B material were design validated to a yield strength of 36 ksi (as specified in Revisions 10 through 14 to ASME Code Case N-71).

The use of a 36 ksi yield strength at 100'F for A500 Grade 8 tube steel (as specified in Revisions 10 through 14 to the Code Case) provided more stringent requirements believed to be justified by the staff until the currently available test data established that there was no significant reduction of the yield strength of the cold-formed material in the heat affected zone of weldments.

As a result of the recent test data, the yield strength was increased in Revision 15 to ASME Code Case N-71 to 46 ksi.

Although the NRC staff, at this time, has not yet finalized its review of the acceptability of using an increased yield strength of 46 ksi for A500 Grade B tube shapes (as specified in Revision 15 to ASME Code Case N-71),

the staff finds that a 42 ksi yield strength at 100*F (as specified in Revision 9 to the Code Case and previously approved by the staff) can be used without undue risk to the public health and safety and is, thus, acceptable.

Sincerely, CI a Christo.oher 1. Grimes, Director Comanche Peak Project Division Office of Special Projects cc:

See next page

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4 W. G. Counsil Comanche Peak Steam Electric Station Texas Utilities Electric Company Units 1 and 2 cc:

Jack R. Newman, Esq.

Asst. Director for Inspec. Programs Newman & Holtzinger, P.C.

Comanche Peak Project Division Suite 1000 U.S. Nuclear Regulatory Commission 1615 L Street, N.W.

P. O. Box 1029 Washington, D.C. 20036 Granbury, Texas 76048 Robert A. Wooldridge, Esq.

Regional Administrator, Region IV Worsham, Forsythe, Sampels &

U.S. Nuclear Regulatory Commission Wooldridge 611 Ryan Plaza Drive, Suite 1000 2001 Bryan Tower, Suite 2500 Arlington, Texas 76011 Dallas, Texas 75201 Lanny A. Sinkin Mr. Homer C. Schmidt Christic Institute Director of Nuclear Services 1324 North Capitol Street Texas Utilities Electric Company Washington, D.C.

20002 Skyway Tower 400 North Olive Street, L.B. 81 Ms. Billie Pirner Garde, Esq.

Dallas, Texas 75201 Government Accountability Project Midwest Office Mr. Robert E. Ballard, Jr.

104 East Wisconsin Avenue Director of Projects Appleton, Wisconsin 54911 Gibbs and Hill, Inc.

11 Penn Plaza New York, New York 10001 David R. Pigott, Esq.

Orrick, Herrington & Sutcliffe 600 Montgomery Street Mr. R. S. Howard San Francisco, California 94111 Festinghouse Electric Corporation P. O. Box 355 Anthony Z. Roisman, Esq.

Pittsburgh, Pennsylvania 15230 Suite 600 1401 New York Avenue, NW Renea Hicks, Esq.

Washington, D.C. 20005 Assistant Attorney General Environmental Protection Division Robert Jablon P. 0. Box 12548, Capitol Station Bonnie S. Blair Austin, Texas 78711 Spiegel & McDiarmid 1350 New York Avenue, NW Mrs. Juanita Ellis, President Washington, D.C. 20005-4798 Citizens Association for Sound Energy 1426 South Polk George A. Parker, Chairman Dallas, Texas 75224 Public Utility Committee Senior Citizens Alliance Of Ms. Nancy H. Williams Tarrant County, Inc.

CYGNA Energy Services 6048 Wonder Drive 2121 N. California Blvd., Suite 390 Fort Worth, Texas 76133 Walnut Creek, CA 94596

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W. G. Counsil Comanche Peak Electric Station Texas Utilities Electric Company Units 1 and 2 cc:

Joseph F. Fulbright Fulbright & Jaworski 1301 McKinney Street Houston, Texas 77010 Roger D. Walker Manager, Nuclear Licensing Texas Utilities Electric Company Skyway Tower 400 North Olive Street, L.B. 81 Dallas, Texas 75201 Mr. Jack Redding c/o Bethesda Licensing i

Texas Utilities Electric Company 3 Metro Center, Suite 610 Bethesda, Maryland 20814 William A. Burchette, Esq.

Counsel for Tex-La Electric Cooperative of Texas l

Heron, Burchette, Ruckert & Rothwell Suite 700 1025 Thomas Jefferson Street, NW Washington, D.C.

20007 James P. McGaughy, Jr.

GDS Associates, Inc.

Suite 720 1850 Parkway Place Marietta, Georgia 30067 Administrative Judge Peter Bloch U.S. Nuclear Regulatory Commission Washington, 0.4.

20555 Elizabeth B. Johnson Administrative Judge Oak Ridge National Laboratory P. O. Box X, Building 3500 Oak Ridge, Tennessee 37830 Dr. Kenneth A. McCollom 1107 West Knapp Stillwater, Oklahoma 74075 Dr. Walter H. Jordan c/o Carib Terrace Motel 522 N. Ocean Boulevard Pompano Beach, Florida 33062

January 15, 1988 Mr. William G. Counsil

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