ML20093G789

Final Deficiency Rept Re Concrete Embedment Design Using Shear Lugs Located Outside Compression Zone.No Corrective Action Required.Not Reportable Under 10CFR50.55(e)

ML20093G789
Person / Time
Site:	Midland
Issue date:	07/11/1984
From:	Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
30357, 82-12-#7, OL, OM, NUDOCS 8410160033
Download: ML20093G789 (5)

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@ CODSumBIS u, wca Compahy vica r,,,isa.f - r,oiact e.gi.aari.s and Con,truction oeneral Offices: 1945 West Parnell rtoad, Jackson, MI 49201 + (517) 788 0453 July 11, 1984 82-12 #7 Mr J G Keppler, Regional Administrator US Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND ENERGY CENTER PROJECT DOCKET NOS 50-329 AND 50-330 SHEAR LUG DESIGN FOR EMBEDS FILE: 0.4.9.68 SERIAL: 30357

Reference:

J W Cook letters to J G Keppler, same subject:

1) Serial 19106, dated December 3, 1982

2) Serial 20721, dated March 1, 1983

3) Serial 22207, dated May 20, 1983

4) Serial 26603, dated November 22, 1983

5) Serial 28015, dated February 24, 1984

6) Serial 30301, dated June 1, 1984 The referenced letters were interim 10CFR50.55(e) reports regarding concrete embedment design using shear lugs located outside the compression zone. This is a final report.

Consumers Power Company has reviewed the results of Bechtel Project Engineering investigations and concurs that the use of shear lugs outside the compression zone is an effective and proper design technique. The attachment to this letter describes the investigation process that lead to this conclusion.

L JWC/WRB/cd

Attachment:

1) MCAR 63, Final Report, dated May 14, 1984 CC: Document Control Desk, NRC DSHood, US NRC Washington, DC Office of NRR Midland NRC Resident Office INPO Records Center Midland Nuclear Plant 2

AUG 8410160033 840711 PDR ADOCK 05000329 PDR OC0784-0020A-MP01 s S y

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2 182-12 17

-Serial 30357 s OM/0L SERVICE LIST Mr. Frank'J Kelley ' Atomic Safety & Licensing' Attorney General of1the Appeal Board State of Michigan- U S Nuclear Regulatory Commission

.Ms Carole Steinberg .

Washington,- DC 20555.

Assistant Attorney General'

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Environmental Protection Division Mr C R Stephens (3) 720 Law Building Chief, Docketing & Services.

. Lansing, MI 48913 U S Nuclear Regulatory Commission Office of the Secretary Washington, DC 20555

- Mr Myron M Cherry,' Esq Suite 3700

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le Mary Sinclair Three First National Plaza '5711 Summerset Street.

Chicagos IL 60602 Midland, MI 48640-

, Mr Wendell.H Marshall Mr William D-Paton,-Esq RFD 10 Counsel for the NRC Staff-Midland, MI 48640 U S-Nuclear Regulatory Commission Washington, DC 20555 Mr Charles Bechhoefer, Esq Atomic Safety &-Licensing Atomic Safety & Licensing Board Panel Board Panel U S Nuclear Regulatory Commission U S Nuclear Regulatory Commission i East-West Towers, Room E-413 Washington, DC 20555 Bethesda, MD 20014 i Ms Barbara Stamaris g Dr Frederick P Cowan 5795 North' River Road.

6152 N Verde Trail Rt 3 ,

Apt B-125 Freeland, MI 48623-Boca Raton, FL 33433 Dr Jerry Harbour Mr Fred C Williams ' Atomic Safety & Licensing Isham, Lincoln & Beale Board Panel-1120 Connecticut Ave, NW, Suite 840 U S Nuclear Regulatory Commission Washington, DC 20036 East-West Towers, Room E-454 Bethesda, MD 20014 Mr James E Brunner, Esq Consumers Power Company Mr M I Miller, Esq 212. West Michigan Avenue 'Isham, Lincoln & Beale Jackson, MI 49201 Three First National Plaza' s.

52nd Floor i Chicago, IL 60602-

. l OC0784-0020A-MP01.

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3 82-12 #7-

. Serial 30357 Mr D F-Judd Babcock & Wilcox PO Box 1260 Mr John Demeester, Esq I Lynchburg, VA 24505 Dow Chemical Building Michigan Division

'Mr Steve Gadler, Esq Midland MI 48640 2120 Carter Avenue St_ Paul, MN 55108 Ms Lynne Bernabei Government Accountability Project Mr P Robert Brown 1901 Q Street, NW

' Clark, Klein & Beaumont -Washington, DC 20009 1600 First Federal Bldg.

Woodward Ave Detroit, MI 48226 3/14/84

'OC0784-0020A-MP01

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Attachment 1

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070I seria1 30301 i 50679 Bechtal Associates Professional Corporation

SUBJECT:

MCAR 63 (Issued 11/10/82)

Design of Steel Embedmonts That Use Shear Luss Located Outside of.the Compression Zone FINAL REPORT DATE: May 14, 1984 i PROJECT: Consumers Power Company Midland Plant Units 1 and 2 Bechtel Job 7220 l

Reference:

Rotz, J.V. and Reifschneider, M., Experimental '

Evaluation of Steel Embedmonts in Concrete Subjected to Combined Axial and Shear Loading, Bechtel Power Corporation, February 1984 Introduction This report addresses a concern with the design of steel embedments in concrete that use shear lugs located outside of the compression zone.

Backaround The American Concrete Institute (ACI) 349 Code, Appendix B,-issued August 1979, specifies that shear lugs in embedment designs shall be considered effective only in the compression zone. Midland i embedmont designs completed and installed before this date considered shear lugs to accommodate shear loads and tension bars to accommodate tension loads. Other than ACI 349, Appendix B, r.o known design code or industry standard restricts the design of embedments using shear lugs outside the compression zone.

For embedmonts within the scope of this NCAR, the Midland Final Safety Analysis Report, Section 3.8, is committed to design reinforced concrete according to ACI 318-63 and 318-71, and structural steel according to the AISC 1969 edition; however, these codes do not specifically address all aspects of embedmont design.

Investinative Action An evaluation to determine which of the embedmonts identified have shear lugs located outside the compression zone has been completed for the current design loads.

To determine if the embedmonts installed in the Midland plant are capable of performing their safety function, a testing program was completed at the University of Michigan to determine the effectiveness of shear lugs located outside of the compression zone. Evaluation of the test results shown in the reference was completed February 29, 1984.

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F Bechtel Associates Professional Corporation "cA= 63 l FINAL REPORT 150701 150679 Page 2 Analysis of Safety Implications Analysis of the tests shows that shear lugs located outside the compression zone are fully effective. Analysis of the tests also shows that the cossnon practice of resisting all tension loads by the tension anchors and all shear loads by the shear lugs (including those outside the compression zone) is a conservative procedure.

Therefore, this design practice, which was in place before issuance of MCAR 63, is sufficient to ensure a safe and adequate design.

Corrective Action There is no corrective action required.

Reportability This concern, considered potentially reportable in accordance with Title 10 of the Code of Federal Regulations, Part 50.55(e), was reported to the NRC by Consumers Power Company on November 5, 1982.

Based on evaluation of the test results this concern is considered not reportable.

$N 7 Submitted by: ( l E.B. PosM Project Engineering Manager Approved by:

T.E. hnson Civi Chief Engineer

/ s Approved by: $- I M'l L (- ( '

E.H. Smith ' ,

Engineering Manager Concurrence by: 2h# c'-- ,

y'b M.A. DieteTch Project Quality Assurance Engineer I PVR/MPA/jsh*

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