ML20004C189

Summary of 810508 Meeting W/Util & Bechtel Re Immediate Schedular & Administrative Aspects of Problems Associated W/Inadequately Compacted Backfill.W/List of Attendees

ML20004C189
Person / Time
Site:	Midland
Issue date:	05/19/1981
From:	Hood D Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
ISSUANCES-OL, ISSUANCES-OM, NUDOCS 8106010717
Download: ML20004C189 (5)

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?%/9 Docket Nos:: 50-329/330 OM, OL

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Consumers Power Company

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FACILITY:

Midland Plant, Units 1 & 2 Iig

SUMMARY

OF MAY 8,1981 MEETING ON MIDLAND SOILS DEFICIENCES On May 8,1981 management personnel from Consumers Power Company and the NRC met to discuss certain imediate schedular and administrative aspects of the problems associated with the inadequately compacted backfill at the Midland site. Meeting attendees are listed by Enclosure 1.

Mr. D.

udzik of Consumers sim:marized the results of meetings of the previous three days with the NRC technical staff and consultant regarding the soils settlement matter. This included changes in the remedial concepts proposed by the Service Water Structure (from piles to a Bin Wall concept), the Borated Water Storage Tank (the addition of an adjacent ring foundation), and the Auxiliary Building (from caissons to s concrets pier concept). Numerous underground pipes are calculated to exceed current code stress limits with present profiled measurements and revised criteria and additional profiling are planned.

Vice-President Cook emphasized that drilling and installation of 20 backup inter-ceptor wells along with the Circulating Water Intake and Service Water Pump Structures needs to begin now to provide for construction dewatering for the bin wall underpinning of the Service Water Structure. These will eventually become part of the Permanent Dewatering System. This need is further described in Mr. Cook's letter of April 3,1981. Mr. Tedesco's telecon summary dated Aoril 10 1981 identified several conditions needed for staff concerrence on proceeding with permanent plant dewatering, for which two remain unresolved after Mr. Cook's reply of April 24, 1981 Regarding the unresolved condition that the installation activities of the underground portions of the wells be Q-listed, Mr. Cook sug-gested that the presence of the Corps of Engineers or the staff in the field be considered to expedite this resolution. Regarding the other unresolved condition, Consumers believe that a commitment to a 5 micron filter capable of detecting silt can be provided in the near future to resolve this condition.

Mr. Cook described this remedial action for the concrete ring foundation of the Borated Water Storage Tank (BWST) which cracked during proof testing.

Remediation consists of adding an adjacent outer ring of reinforced concrete attached by dowels.

Consumersviews the deficiency as a structural design problem resulting from the failure to recognize the differential stiffness and differential loadings associated with t'. ring foundation and integral val e pit foundation. The staff noted 8 7 nanu 717

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that assessment of the remedial actions is soils dependents. Consumers also proposes to preload the valve pit of the BWST to induce settlement and relieve e

stress at the valve pit-ring foundation interface. Mr. Cook requested staff concurrence on preceding with preloading even though he does not believe this t

problem is soils related, nor relevant to the instant hearing, nor subject to the agreement not to oroceed with soils related remedial actions without staff concurrence. The injection piping will be disconnected during preloading. The staff requires additional information regarding monitoring aspects of the pre-load program, including details for the fill and drain lines, to assess the preload pl an s.

The staff's position regarding the seismic response spectra provided at the Prehearinq - Conference of April 27, 1981, was reviewed. Mr. Cook advised that five advanced copies of Part II of the report on the site specific response spectra applicable for the top of the fill material was being forwarded by express mail. The seismic margin check nceded to support the OL review will be the subject of a let'.er to be forwarded shortly by the applicant. Mr. Cook requested followup meetings on the seismic margin letter about three weeks after its receipt.

Consumers also requested staff feedback with respect to Bechtel's proposals and views regarding the significance of cracks in structures which was discussed during the structural design audit of April 20 - 24, 1981 and May 7,1981.

Originalsigned by:

Darl Hood, Project Manager Licensing Branch No. 4 Division of Licensing Enclosures :

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MAY 191981 Docket Nor : 50-329/330 OM, OL APPLICANT:

Consumers Power Company FACILITY:

Midland Plant Units 1 & 2 l

SUMMARY

OF MAY 8,1981 MEETING ON MIDLAND SOILS DEFICIENCES On May 8,1981 management personnel from Consumers Power Company and the NRC met to discuss certain immediate schedular and administrative aspects of the problems associated with the inadequately compacted backfill at the Midland site.

Meeting attendees are listed by Enclosure 1.

Mr. D. Suc:ik of Consumers su=ari:ed the results of meetings of the previous three days with the NRC technical staff and consultant regarding the soils settlement This included changes in the remedial concepts proposed by the Service matter.

Water Structure (from piles to a Bin Wall concept), the Borated Water Storage Tank (the addition of an adjacent ring foundation), and the Auxiliary Building (from caissons to a concrete pier concept). Numerous underground pipes are calculated to exceed current code stress limits with present profiled measurements and revised criteria and additional profiling are planned.

Vice-President Cook emphasized that drilling and installation of 20 backup inter-captor wells along with the Circulating Water Intake and Service Water Pump Structures needs to begin now to provide for construction dewatering for the bin wall underpinning of the Service Water Structure.

These will eventually become part of the Permanent Dewatering System.

This need is further described in Mr. Cook's letter of April 3,1981. Mr. Tedesco's telecon summary dated April 10, 1981 identified several conditions needed for staff concurrence on proceeding with permanent plant dewatering, for which two remain unresolved after Mr. Cook's l

reply of April 24, 1981.

Regarding the unresolved condition that the installation i

activities of the underground portions of the wells be Q-listed, Mr. Cook sug-gested that the presence of the Corps of Engineers or the staff in the field be considered to expedite this resolution.

Regarding the other unresolved condition, Consucers believes that a commitment to a 5 micron filter canable of detectina sil: can be provided in the near future to resolve this condition.

I Mr. Cook described the remedial action for the concrete ring foundation of the 3 crated Water Storage Tank (BWST) which cracked during proof testing.

Remediation consists of adding an adjacent outer ring of reinforced concrete attached by dowels.

Consumers views the deficiency as a structural design problem resulting from the failure to recogni:e the differential stiffness and differential loadings associated with the ring foundation and integral valve pit foundation.

The staff noted 4

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Consumers Power Company.

that assessment of the remedial actions is soils dependent.

Consumers also proposes to preload the valve pit of the B'JST to induce settlement and relieve stress at the valve pit-ring foundation interface. Mr. Cook requested staff concurrence on preceding with preloading even though he does not believe this problem is soils related, nor relevant to the instant hearing, nor subject to the agreement not to oreceed with soils related remedial actions without staff concurrence. The injection piping will be disconnected during preloading. The staff requires additional information regarding monitoring aspects of the pre-load program, including details for the fill and drain lines, to assess the preload pl ans.

The staff's position regarding the seismic response spectra provided at the Drehearing Conference of April 27, 1981 was reviewed. Mr. Cook advised that five advanced copies of Part II of the report on the site specific response spectra applicable for the top of the fill material was being forwarded by express mail.

The seismic margin check needed to support the OL review will be the subject of a letter to be forwarded shcrtly by the applicant. Mr. Cook requested followup meetings on the seismic margin letter about three weeks after its receipt.

Consumers also requested staff feedback with respect to Bechtel's proposals and views regarding the significance of cracks in structures which was discussed during the structural design audit of April 20 - 24, 1981 and May 7,1981, ifL.}cclh Darl Hood, Project Manager Licensing Branch No. 4 Division of Licensing Enclosures :

As stated cc:

See next page i

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Mr. J. W. Cook Vice President Consumers Power Company 1945 West Parnall Road escison, Michigan 49201 cc:

Michael I. Miller, Esq.

Mr. Don van Farowe, Chief Ronald G. Zamarin, Esq.

Division of Radiological Health Alan S. Farnell, Esq.

Department of Public Health Isham, Lincoln & Beale P.O. Box 33035 Suite 4200 Lansing, Michigan a8909 1 First National Plaza Chicago, Illinois 60603 James E. Brunner, Esq.

William J. Scanlon, Esq.

Consumers Power Company 2034 Pauline Boulevard 212 West Michigan Avenue Ann Arbor, Michigan 48103 Jackson, Michigan 49201 U. S. Nuclear Regulatory Commission Myron M. Cherry, Esq.

Resident Inspectors Office 1 IBM Plaza Route 7 Chicago, Illinois 60611 Midland, Michigan 48640 Ms. Mary Sinclair Ms. Barbara Stamiris 5711 Summerset Drive 5795 N. River Midland, Michigan 48640 Freeland, Michigan 48623 Frank J. Kelley, Esq.

Attorney General l

State of Michigan Environmental Protection Division 720 Law Building Lansing, Michigan 48913 Mr. Wendell Mars' hall Route 10 Midland, Michigan 48640 Mr. Steve Gadler 2120 Carter Avenue St. Paul, Minnesota 55108 4

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cc: Commander, Naval Surface Weapons Center ATTN:

P. C. Huang White Oak l

Silver Spring, Maryland 20910 l

Mr. L. J. Auge, Manager Facility Design Engineering Energy Technology Engineering Center P. O. Box 1449 Canoga Park, California 91304 Mr. William Lawhead U. S. Corps of Engineers l

NCEED - T I.

7th Floor 477 Michigan Avenue Detroit, Michigan 48226 Charles Bechhoefer, Esq.

Atomic Safety & Licensing Board U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Mr. Ralph S. Decker Atomic Safety & Licensing Board U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Dr., Frederick P. Cowan Apt. B-125 6125 N. Verde Trail Boca Raton, Florida 33433 l

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i Consumers Power Company - NRC i

May 8,1981 Consumers Power Company NRC Staff J. Cook A. Schwencer (for R. Tedesco)

D. Budzik E. Adensam L. Thiruvengadam E. Brown J. Knight D. Hood i

Bechtel A. Boos L. Johnson t

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