ML20082H619
| ML20082H619 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 11/22/1983 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 26603, 82-12-#4, MCAR-63, NUDOCS 8312010224 | |
| Download: ML20082H619 (6) | |
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s CORSull18IS Power James W Cook Vice President - Projects, Engineering and Construction General Offices: 1945 West Parnell Road, Jackson, MI 49201 e (517) 788 0453 November 22, 1983 82-12 #4 Mr J G Keppler, Regional Administrator US Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND ENERGY CENTER DOCKET NOS 50-329 AND 50-330 SHEAR LUG DESIGN FOR EMBEDS FILE:
0.4.9.68 SERIAL:
26603
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) Serici 22207, dated May 20, 1983 This letter, as were the referenced letters, is an interim 50.55(e) report regarding the design of the embedments in concrete that use shear lugs located in tension zones. The attachment to this letter provides a description of the investigation and the corrective actions being taken with regard to this subject.
The embedment testing program described is now being completed. The embedment design criteria will be revised to incorporate the results of the testing program. The interim embedment design criteria currently in use meets the intent of ACI-349 Appendix B in that credit is not taken for shear lugs in tension zones.
Another report, either interim or final, will be sent on or before February 3, 1984.
JWC/WRB/rlm 4
Attachment:
(1) MCAR-63, Interim Report 4, dated November 1, 1983 8312010224 831122 NOV 2 51983 DR ADOCK 05000 OC1183-0027A-MP01 fg
2 82-12 #4 SERIAL: 26603 CC: Document Control Desk, NRC-Washington, DC
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RJCook, NRC Resident Inspector-Midland Nuclear Plant
_DSHood, USNRC Office of NRR INPO Records Center 1
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3 82-12 #4 SERIAL:
26603 OM/0L SERVICE LIST Mr Frank J Kelley Atomic Safety & Licensing Attorney General of the Appeal Board State of Michigan U S Nuclear Regulatory Commission Ms Carole Steinberg, Esq Washington, DC 20555 Assistant Attorney General 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 Ms Mary Sinclair Three First National Plaza 5711 Summerset Street Chicago, 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 Washington, DC 20555 Washington, DC 20555 Dr Frederick P Cowan Ms Barbara Stamiris 6152 N Verde Trail 5795 North River Road Apt B-125 Rt 3 Boca Raton, FL 33433 Freeland, MI 48623 Mr Fred C Williams Mr Jerry Harbour Isham, Lincoln & Beale Atomic Safety & Licensing 1120 Connecticut Ave, NW, Suite 325 Board Panel Washington, DC 20036 U S Nuclear Regulatory Commission Washington, DC 20555 Mr James E Brunner, Esq Mr M I Miller, Esq Consumers Power Company Isham, Lincoln & Beale 212 dest Michigan Avenue Three First National Plaza Jackson, MI 49201 52nd Floor Chicago, IL 60602 Mr D F Judd Mr John Demeester, Esq Babcock & Wilcox Dow Chemical Building PO Box 1260 Michigan Division Lynchburg, VA 24505 Midland, MI 48640 Mr Steve Gadler, Esq Ms Lynne Bernebei 2120 Carter Avenue Covernment Accountability Project St Paul, MN 55108 1901 Q Street, NW Washington, DC 20009 September 6, 1983 OC1183-0027A-MP01
Serial 26603 82-12 #4 Bechtel Associates Professional Corporation 133374 133359
SUBJECT:
MCAR 63 (Issued 11/10/82)
Design of Steel Embedmonts That Use Shear Lugs Located in Tension Zones INTERIM REPORT 4 DATE:
November 1, 1983 PROJECT:
Consumers Power Company Midland Plant Units 1 and 2 Bechtel Job 7220 Introduction This report addresses a concern with the design of steel embedments in concrete that use shear lugs located in tension zones.
Background
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 compression zones. Midland embedment designs completed and installed before this date considered shear d
lugs to accommodate shear loads and tension bars to accommodate tension loads. Other than ACI 349, Appendix B, no known design code or industry standard restricts the design of embedments using shear lugs outside the compression zone.
For embedments 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 embedment design.
Investir.ttive Action l
Aa evaluation to determine which of the embedments identified have shear lugs located in tension zones has been completed for the l
existing loads.
l To determine if the embedments installed in the Midland plant are
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capable of performing their safety function, a testing program is in progress at the University of Michigan. The purpose of the testing program is to determine the effectiveness of shear lugs located in tension zones. The testing is expected to be completed by the end of November 1983.
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Bechtel Associates Professional Corporation 133374 133359 NCAR (3 INTERIM REPORT 4 Page 2 Probable cause The apparent root cause is that before issuance of ACI 349, Appendix B, the possible behavior of shear lugs in tension zones was not recognized by codes or industry standards.
Corrective Action To enable new designs and modifications to existing designs to be completed, an interim embedment design criterion was developed and is presently being used. After evaluating the investigative actions, the embedment design criterion will be finalized, and other corrective actions will be determined.
Ana1Ysle of Safety InD11 cations The concern is that shear lugs located in tension zones may not be fully effective and that this may result in a nonconservative design. The design may be nonconservative to the extent that the embedment may not be capable of performing its required safety function.
Reportability This concern is considered potentially reportable in accordance with Title 10 of the Code of Federal Regulations, Part 50.55(e) and was reported to the NRC by Consumers Power Company on November 5, 1982.
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l33374 Bechtel Associates Professional Corporation NCAR 63 INTERIM REPORT 4 Page 3 b
Submitted by:
P.V. Regupathy Civil / Structural Group Supervisor i
Approved by:
s "E.M. Hughes Project Engineer Concurrence by:
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T.E. Johnson
" Civil Discipline hief Concurrence by:
LL E.H. Smith Engineering Maneger Concurrence by:
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fur-M. A. Dietrief Project Quality Assurance Engineer 1
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