ML20151E449

Summary of 880713 Audit at S&W Ofcs in Boston,Ma Re Test Results for Concrete Anchorages

ML20151E449
Person / Time
Site:	Comanche Peak
Issue date:	07/15/1988
From:	Terao D NRC OFFICE OF SPECIAL PROJECTS
To:	NRC OFFICE OF SPECIAL PROJECTS
Shared Package
ML20151E452	List: ML20151E449 ML20151E469
References
NUDOCS 8807260070
Download: ML20151E449 (6)

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July 15, 1988 Doch t Nos. 50-445 and 50-446 APPLICANT:

Texas Utilities Electric Company (TV Electric)

FACILITY:

Comanche Peak Steam El'-tric Station (CPSES), Units 1 and 2

SUMMARY

OF AUDIT ON Jui.Y 13, 1988 - TEST RESULTS FOR CONCRETE ANCH0 RAGES j

1 On July 13, 1988, the NRC staff and its consultant conducted an audit at the offices of Stone & Webster Engineering Corporation (SWEC) in Boston, MA of l

the results of testing conducted for the design validation of concrete anchorages at CPSES. The purpose of the audit was to review the test results and their use in developing design criteria for compoJent support concrete anchorages. Specifically, the. staff reviewed the reports applicable to:

(1) tests of Hilti Kwik-Bolts in core-drilled holes and (2) tests of Richmond inserts with partial thread engagement. A list of audit participants is pro-H vided in Enclosure 1 to this sumary.

A general presentation of the tests conducted by SWEC for Hilti Kwik-Bolts and Richmond ihserts was given to the staff (Enclosure 2 to this sumary).

The test results were used to develop the design criteria in CPSES design basis document DBD-CS-015 "The Qualification of Embedments in Concrete," and in Specification 2323-SS-30, "Structural Embedments." The design basis document establishes the anchorage design criteria for all component supports, (e.g., HVAC, cable tray hangers, conduit supports, piping, and equipment) under the TU Electric Corrective Action Program (CAP).

The following is a suunary of the areas covered during the audit.

(1) Tests of Hilti Kwik-Bolts in Core-Drilled Holes Generally, a standard masonry dril: bit is used at EPSES for installing concrete

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expansion anchors.

In certain circumstances (e.g., when design changes require larger anchor bolts), an extraction core drill bit micht be u::ed for removing theexistinganchor,andanew(largersize)boltwouidbeinstalledinits place. A concern was raised by an independent review by CYGNA Energy Services that the ultimate load capacity of Hilti Kwik-Bolts installed in holes drilled with extraction drill bits (i.e., core-drilled) might be less than the ultimate 102.4 capacity of anchors installed using a standard masonry drill.

Under TU Electric's CAP, SWEC conducted tests to validate the pullout ' capacity of Hilti Kwik-Bolts installed in core-drilled holes. The tests were performed in accordance with ASTM E-488. The test results are documented in SWEC Test Report No. 18051.01-CS(B)-17-09, "Report on Tests of Hilti Kwik-Bolts in Core-Drilled Hnles," June 1988. The test results indicate that, in general, the capacity of core-drilled holes were slightly smaller than the capicity of standard (masonry bit) drilled holes, but the core-drilled and standard-drilled holes were within the design capacity of the anchorage (i.e., the adjusted 8807260070 0807151 g

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Sumary of July 13, 1988 Audit average ultimate capacity reduced by a factor.of safety of 4), except for the following. The tests revealed that 3/4-inch Hilti Kwik-Bolts with an embed-ment of 8 and 9 inches exhibited substantial reduction in design capacity.

The reduction in capacity occurred in both core-drilled and standard-drilled holes, although core-drilled holes exhibited greater reduction. The test results are shown in Table 5 of Enclosure 2 to this sumary. Consequently, TV Electric notified the NRC of this deficiency and issued a Significant Deficiency Analysis Report (SDAR) CP-86-51 (Supplemental Report) in a letter from W. G. Counsil (TV Electric) to USNRC dated June 23, 1988. The results of the tests will be incorporated into Revision 3 to the Specification 2323-SS-30 and the reduced anchorage capacity is being reviewed by the applicant for po-tential impact on the design and construction of systems and components at CPSES.

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(2) Tests of Richmond Inserts with Partial Thread Engagepent The Comanche Peak Respo'ise Team (CPRT) identified an issue under its Quality of Construction (Q0C) Program that the constructor installing Richmond inserts in 'iVAC supports used a turn-of-the-nut method for pretensioning the bolts and that, in some cases, the bolts were partially threaded in the insert.

SWEC perfonned tests to establish the capacity of Richmond inserts with partial thread engagement (including the effect with and without preloading). The test results are documented in three test reports:

(1)' Test' Report No. 16345/6-CS(B)-17-05, "Report on Tests of Richmond Inserts with Partial Bolt / Rod Thread Engagement," July 1987 (2) Test Report No. 16345/6-CS(B)-17-06,"ReportonPreliminaryTests of Richmond Inserts with Pretensioned High Strength Bolts and Partial Bolt Engagement," June 1988 (3) Test Report No. 16345/6-CS-(B)-17-07, "Report on Final Qualification Tests of Richmond Inserts with Pretensioned High Strength Bolts and Partial Bolt Engagement," June 1988.

The test results established reduced capacity allowable limits for Richmond inserts with partial thread engagement and with no pretensioning. For HVAC support where pretensioning occurred, the test results showed full design loads

• in both shear and tension can be achieved when engagement is 1 5/16-inch (62 percent thread engagement).

Furthermore, it was demonstrated that for engagements of 1 5/16-inch or more, the insert was not damaged by the preten-sioning for the range of applied loads.

For thread engagement less than The design loads for 1-inch Richmond inserts are:

4,000 lbs. (factor of safety of 3) normal load extreme load - 6,000 lbs. (factor of safety of 2) 3m9*-

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6 3-Sumary of July 13, 1988 Audit 1-5/16-inch, the capacity of the insert was reduced and the turn-of-tb -nut method of pretensioning bolts resulted in damage to the insert.

A total of 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> was involved in this audit.

David Terao, Project Manager Comanche Peak Project Division Office of Special Projects Enclosures 1.

List of Audit Participants 2.

Presentation to NRC Staff cc: See next page 0

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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. 0. Box 1029 i

Washington, D.C. 20036 Granbury, Texas 76048 j

Robert A. Wooldridge, Esq.

Regional Administrator, Region IV Worsham, Forsythe, Sampels &

V.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. R. W. Ackley 104 East Wisconsin Avenue Stone & Webster Appleton, Wisconsin 54911 Comanche Peak Steam Electric Station P. O. Box 1002 David R. Pigott, Esq.

Glen Rose, Texas 76043 Orrick, Herrington & Sutcliffe 600 Montgomery Street Mr. J. L. Vota 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 Susan H. Theisen Washington, D.C. 20005 Assistant Attorney General Environmental Protection Division Robert Jablon P. O. Box 12548, Capitol Station Bonnie S. Blair Austin, Texas 78711-154r 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 Dellas, 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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2-Comanche Peak Electric Station W. G. Counsil 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

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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 Bethesda, Maryland 20814 William'A. Burchette, Esq.

Counsel for Tex-La Electric Cooperative of Texas Heron, Burchette, Ruckert & Rothwell Suite 700 1025 Thomas Jefferson Street, NW Washington, D.C.

20007 GDS ASSOCIATES, INC.

Suite 720 1850 Parkway Place Marietta, Georgia 30067-8237 Administrative Judge Peter Bloch U.S. Nuclear Regulatory Commission Washington, D.C.

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 881 West Outer Drive Oak Ridge, TN 37830 me m suis me

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ENCLOSURE 1 Audit of CPSES Tests for Concrete Anchoraces (July 13, 1988; Name Com)any F""U. Ciatto 3WE; T. Lynch SWEC R. Hookway Teledyne Engineering Services (NRC i.onsultant)

D. Terao USNRC

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