ML20081D170
| ML20081D170 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 11/21/1983 |
| From: | Novak T Office of Nuclear Reactor Regulation |
| To: | Atomic Safety and Licensing Board Panel |
| Shared Package | |
| ML20081D174 | List: |
| References | |
| TASK-AS, TASK-BN83-174 BN-83-174, ISSUANCES-OL, ISSUANCES-OM, NUDOCS 8311010021 | |
| Download: ML20081D170 (4) | |
Text
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NUCLEAR REGULATORY COMMISSION o
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November 21, 1983 Docket Nos: 50-329 OM, OL and 50-330 OM, OL MEMORANDUM FOR: The Atomic Safety and Licensing Board for the Midland Plant, Units 1 and 2 FROM:
Thomas M. Novak, Assistant Director for Licensing Division of Licensing
SUBJECT:
BOARD NOTIFICATION REGARDING MIDLAND AUXILIARY BUILDING UNDERPINNING (BN 83-174)
This Notification is provided in accordance with NRC procedures regarding Board Notifications and is deemed to provide new information material and relevant to safety issues in the OM-OL proceeding. On September 14 and 15, 1983, the NRC and its consultants audited revised calculations for the design adequacy of the Midland Auxiliary Building reflecting the results of an underpinning pier load test. The test results had indicated that the soil modulus for the base of the underpinning should be 1500 KSF rather than the 3000 KSF used in the original analysis; thus, Bechtel revised its structural analysis using 1" of settlement rather than 1".
The audit meeting was summarized by R. Warnick's letter of October 5,1983, and copies were pro-vided to the ASLB and hearing parties. During the course of this audit, the NRC received additional information which calls into question the validity of the assumptions upon which the staff's acceptance of the underpinning design was based. The additional information is reflected in paragraphs d, e and g of R. W. Warnick's memorandum of October 11, 1983 (Enclosure 1). The informa-tion concerns (1) the manner in which differential settlement has been applied in the applicant's structural stress calculations, (2) the absence of limits for upward movement of the structure during jacking operations, (3) the acceptability of the actual measured upward movement due to jacking, and (4) the extent to which settlement stresses can be jacked out of the completed structure.
Paragraph d of Enclosure 1 notes that the stress calculations for 1" of dif-ferential settlement at the southern edge of the Control Tower results from a settlement gradient that begins at the center of the main Auxiliary Building, rather than a point at the northern edge of the Control Tower. Application of the 1" gradient over this longer distance is inconsistent and non conserva-tive with respect to the prior review performed by the staff which led to l
acceptance of the 1" differential settlement in Supplement 2 to the SER, page l
2-40.
The staff is presently evaluating the effects of this recent informa-l tion and believes a solution can be reached by establishing a future differen-l tial settlement limit in the Technical Specifications that will be based on field monitoring records. The limit to be established will assure the integ-l rity of the involved structures.
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Paragraphs e and g of Enclosure 1 call into question 1) what should be the upward movements of the structures during jacking operations and 1 whether or not the stresses due to settlements prior to and during underpin..
,construc-tion can be completely jacked out of the completed structure. With respect to the upward movements, the staff understands that the east EPA has been jacked to 91 mils of upward movement and the west EPA has been jacked to 70 mils.
Upward movement in excess of 30 mils has not been reviewed by the staff. On the issue of stresses due to settlement, and underpinning operations, the allowable jacking loads are limited by a concern for redistribution of stresses following upward movement of the structures. The apolicant's analysis, relied upon by the staff, assumed no significant residual stress due to earlier settlements for the completed underpinned structure and, there-fore, may not be sufficiently conservative. We understand that Region III has verbally imposed a hold on further jacking in excess of that previously reviewed by the NRC staff pending establishment of allowable jacking limits.
The issues associated with this and other infomation from the September design audit are presently being reviewed by NRR in accordance with R. Warnick's request by Enclosure 1.
The staff's response to Enclosure 1, once available, will be provided to the Board.
W
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Thomas M. Novak, Assistant Director for Licensing Division of Licensing R. Warnick memo dated October 11, 1983.
cc: See next page
DISTRIBUTION LIST FOR BOARD NOTIFICATION Midland Units 1&2, Docket Nos.-50-329/330 ACRS Members Charles Bechhoefer, Esq.
Dr. Robert C. Axtmann Ms. Lynne Bernabei Mr. Myer Bender Lee L. Bishop, Esq.
Dr. Max W. Carbon
' James E. Brunner, Esq.
Mr. Jesse C. Ebersole Dr. John H. Buck Mr. Harold Etherington Myron M. Cherry, P.C.
Dr. William Kerr Dr. Frederick P. Cowan Dr. Harold W. Lewis T. J. Creswell Dr. J. Carson Mark Steve J. Galder, P.E.
Mr. William M. Mathis Dr. Jerry Harbour Dr. Dade W. Moeller Mr. Wayne Hearn Dr. Milton S. Plesset Mr. James R. Kates Mr. Jeremiah J. Ray Frank J. Kelley, Esq.
ur. David Okrent Christine N. Kohl, Esq.
Dr. Paul C. Shewmon Mr. Howard A. Levin Dr. Chester P. Stess Mr. Wendell H. Marshall Mr. David A. Ward Michael I. Miller, Esq.
Thomas S. Moore, Esq.
Mr. Paul Rau Ms. Mary Sinclair Ms. Barbara Stamiris Frederick C. Williams, Esq.
Atomic Safety and Licensing Board Panel Atomic Safety and Licensing Appeal Panel Docketing and Service Section Document Management Branch e
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I MIDLAND (ForBNs)
. Mr. J. W. Cook Vice President i
Cons mers Power Company 1945 West Parnall Road Jackson, Michigan 49201 cc: Stewart H. Freeman James G. Keppler, Regional Administrator Assistant Attorney General U.S. Nuclear Regulatory Commission, State of Michigan Enviornmental Region III Protection Division 799 Roosevelt Road 720 Law Building Glen Ellyn, Illinois 60137 Lansing, Michigan 48913 Mr. Ron Callen Mr. Paul Rau Michigan Public Service Commission Midland Daily News 6545 Mercantile Way 124 Mcdonald Street P.O. Box 30221 Midland, Michigan 48640 Lansing, Michigan 48909 Mr. R. B. Borsum' Geotechnical Engineers, Inc.
Nuclear Power Generation Division ATTN: Dr. Steven J. Poulos Babcock & Wilcox 1017 Main Street 7910 Woodmont Avenue, Suite 220 Winchester, Massachusetts 01890 Bethesda, Maryland 20814 Billie Pirner Garde Mr. Don van Farrowe, Chief Director, Citizens Clinic Division of Radiological Health for Accountable Government Department of Pub.'- Health Government Accountability "roject P.O. Box 33035 Institute for Policy Studies Lansing, Michigan 48909 1901 Que Street, N.W.
Washington, D. C.
20009 U.S. Nuclear Regulatory Commission Resident Inspectors Office Comander, Naval Surface Weapons Center Route 7 ATTN: P. C. Huang Midland, Michigan 48640 White Oak Silver Spring, Maryland 20910 Mr. Paul A. Perry, Secretary Consmers Power Company Mr. L. J. Auge, Manager 212 W. Michigan Avenue Facility Design Engineering Jackson, Michigan 49201 Energy Technology Engineering Center P.O. Box 1449 Mr. Walt Apley Canoga Park, California 91304 c/o Mr. Max Clausen Battelle Pacific North West Labs (PNWL)
Mr. Neil Gehring Battelle Blvd.
U.S. Corps of Engineers SIGMA IV Building NCEED - T Richland, Washington 99352 7th Floor 477 Michigan Avenue Mr. I. Charak, Manager Detroit, Michigan 48226 NRC Assistance Projeri, Argonne National Labo.. 60ry ATTN: Clyde Herrick 9700 South Cass Avenue Frenklin Research Center Argonne, Illinois 60439 20th & Race Streets Philidelphia, Pennsylvania 19103 Mr. Patrick Bassett Enorgy Division Norwest. Bank Minneapolis, N. A.
8th and Marquetts Minneapolis, MN 55479
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