ML20236N120

Advises of Concern Re Extensive Development & Application of Design & Acceptance Criteria for Cable Tray Hangers Which Appear to Deviate from Requirements of Applicable Codes,Stds & Reg Guide.Technical Basis for Deviations Requested

ML20236N120
Person / Time
Site:	Comanche Peak
Issue date:	11/09/1987
From:	Charemagne Grimes NRC OFFICE OF SPECIAL PROJECTS
To:	Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
References
NUDOCS 8711160029
Download: ML20236N120 (5)

Text

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UNITED STATES

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NUCLEAR REGULATORY COMMISSION :

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WASHINGTON, D. C. 20065 November 9',

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Docket Nos. 50-445 l

and 50-446 Mr. William G. Counsil

. Executive Vice President:

' Texas Utilities Electric Company 400 North Olice Street, L.B.'81 Dallas, Texas' 75201 1

SUBJECT:

DEVIATIONS FROM CODES, STANDARDS, AND REGULATOM GUIDCS As.a result of recent audits by the NRC staff of the TU Electric Corrective Action Program (CAP) for the Comanche. Peak Steam Electric Station, Units 1-and 2, we have identified a. concern regarding the. extensive development and l

applicatiori of design and acceptance criteria for cable tray hangers.which.

l appear to deviate from the requirements.of the applicable codes, standards, and regulatory guides.

The technical bases for the differing criteria-have been found by the staff to be documented in special studies performed by

. 1 Ebasco Services Incorporated and Impell Corporation in their development of j

the cable tray hangers design and acceptance criteria for the CAP. These special studies have been reviewed'by the CPRT third-party (TENERA, L.P.)

i and audits by the staff, as discussed.in-the NRC staff.sunnary of the audit' of the third-party review of cable tray hangers conducted September 28'-

October 1,1987.

The differing criteria. identified by the staff includes, but are not limited to (1) welds less than the minimum fillet weld size specified by the AISC Code *, (2) bolt hole' oversize, (3) slenderness ratio-limits greater than 200, and-(4) use of a ' static coefficient of less~ than 1.5 to account for multi-frequency excitation'and multimode response.

Although many of the special studies were apparently initiated to provide technical justification for the4 acceptability of the as-built construction configurations it is essential'that the-~resulting design and acceptance criteria used to qualify generic hardware conditions which differ from the requirements in the applicable codes, standards, and' regulatory guides be clearly identified to the staff for review and. approval.; Accordingly, it' 1

is requested that you (1) identify the specific provision in the code, l

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• " Manual of Steel Construction," American Institute of Steel Construction 1

(7thEdition) l 8711160029 871109 i

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d Mr. William G. Counsil November 9, 1987 standard, or regulatory guide from which your design.or acceptance criteria differs, (2) provide the technical basis for the deviation, and (3) discuss-the potential for any reduction in safety margin as provided by' the code, standard, or regulatory guide.

Sincerely, CICwmn Christopher I. Grimes, Director Comanche Peak Project Division l

Office of Special Projects' cc: See next page I

u-y 3

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

cc:

i Thomas G. Dignan, Jr.

Asst. Director for Inspec. Programs Comanche Peak Project Division-Ropes & Gray U.S. Nuclear Regulatory Commission 225 Franklin Street I

Boston, Massachusetts 02110 P. O. Box 1029 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 l

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

-l Dallas, Texas 75201 Government Accountability Project Midwest Office Mr. Robert.E. Dallard, Jr.

104 East Wisconsin Avenue Director of Projects Appleton, Wisconsin 54911 l

Gibbs and Hill, Inc.

i 1

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 Westinghouse 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 Prntection Division Robert Jablon P. O. Box 12548, Capitol Station Bonnie S. Blair i

Austin, Texas 78711 Spiegel & McDiarmid 1350 New York Avenue, NW Mrs. Juanita Ellis, President Washington, D.C.-20005-4798 3

Citizens Association for Sound Energy l

1426 South Polk George A.-Parker, Chairman l

Dallas, Texas 75224 Public Utility Committee Senior Citizens Alliance Of Ms. Nancy H. Williams Tarrant County, Inc.

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

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W. G. Counsil

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Comanche Peak Electric Station Texas Utilities Electric Company Units 1 and 2 i

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 Texas Utilities Electric Company 3 Metro Center, Suite 610 l

Bethesda, Maryland 20814 1

William A. Burchette, Esq.

Counsel for Tex-La Electric Cooperati've 1

of Texas J l

Heron, Burchette, Ruckert & Rothwell 1

Suite 700 1025 Thomas Jefferson Street, NW

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Washington, D.C.

20007 James M. McGaughy

]

GDS Associates, Inc.

l Suite 450 2525 Curaberland Parkway Atlanta, Georgia 30339 Administrative Judge Peter Bloch U.S. Nuclear Regulatory Connission I

1 Washington, D.C.

20555 i

~i Elizabeth B. Johnson j

Administrative Judge 1

Oak Ridge National Laboratory

-l P. O. Box X, Building 3500 Oak Ridge, Tennessee 37830

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Dr. Kenneth A. McCollom 1107 West Knapp Stillwater, Oklahoma 74075 Dr. Walter H. Jordan l

Administrative Judge 881 West Outer Drive Oak Ridge, Tennessee 37830

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&l William G. Counsil

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N vember 9, 1987

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............:.........___1 DATE :11/5/87

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