ML20209B331

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Summary of 820308 Telcon W/Util & Bechtel Re Soil Spring Stiffness for Auxiliary Bldg Underpinning & Phase II Const
ML20209B331
Person / Time
Site: Midland, 05000000
Issue date: 03/11/1982
From: Hood D
Office of Nuclear Reactor Regulation
To:
Office of Nuclear Reactor Regulation
Shared Package
ML20150F172 List:
References
FOIA-84-96 OL, OM, NUDOCS 8204160157
Download: ML20209B331 (8)
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FACILITY: .  !!ioland Plant, Units 1 and 2

.budLCT: Sullw Y OF %Ch 8, lJ' 62 TELEPndi4L Cl ..YtRf,M10N f.r.bARulNL Su!L SPhlNL bilFFdLSSES FOR auAILIARY uullulHG UaDERPIHNIHL A4 PHALL 11 LutoTRUCTiu:.

On elarcli e, l'Juz, l'r. Joseph Aarne of liRP and ukR consultant Dr. $. Poulos participated in a telephone di cussion with rrwers of Consuocrs Power Lusipany and ceclitel. The call discussed the soil spring stiffness values ouopted by bechtel as soils input in their structural analyses of the de s t 'su of the auxiliary building unoerpinning at .iioland Plant, units 1 ano

2. The call also icentified some or tne infuri. ration neede<1 oy the s.kC's geotechnical staff for its concurrence on the start of "p'iase II" of the construction activities tur the unuerpinntnv of the :lidlanti Auxiliary building.

etiase 11.,enerally provides for ceepening of the ve.rtical access shaft,

  1. construction ut the first few piers berreath the od,idcesit Turbine cuilding and for.liuited tunneling seneath the lurbine nuilding ano the Feecwater Isolation Valve Pits. Phase 11 is further defined by a Construction Sequence viagram inclueled as Lnclosure 1 of the suiwary of a January lo-1!s,1*/b2 audit neeting, issuea darch 10, 1902.

Lnclosure 1 is a sur,*:ry or tints teleptione conversation.

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Licensin; tranch no. 4 oivision of Licensing cnclssure:

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  • MIDLAND Mr. J. W. Cook Vice President Consumers Power Covany 1945 West Parnall Road Jackson, Michigan 49201

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cc: Michael I. Miller, Esq. Mr. Don van Farrowe, 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 48909 1 First National Plaza Chicago, Illinois 60603 William J. Scanien. Esq.

2034 Pauline Boulevard James E. Brunner, Esq. Ann Arbor, Michigan 48103 Consumers Power Cogany 212 tiest Michigan Avenue U.S. Nuclear Regulatory Consnission Jackson, Michigan 49201 Resident Inspectors Office 4 s

Route 7 Ms. Mary Sinclair Midland, Michigan 48640 5711 Summerset Drive Midland, Michigan 48640 Ms. Barbara Stamiris 5795 N. River Stewart H. Freeman Freeland, Michigan 48623 Ass M ant Attorney General Stace of Michigan Environmental Mr. Paul A. Perry, Secretary Protection Division i Consumers Power Cogany 720 Law Building 212 W. Michigan Avenue Lansing, Michigan 48913 Jackson, Michigan 49201 g' Mr. Wendell Marshall Mr. Walt Apley, Route 10 i c/o Mr. Max Clausen Midland, Michigan 48640 Battelle Pacific North West Labs (PNWL) a Mr. Roger W. Huston Battelle B1ed. r SIGMA IV Building h Suite 220 Richland, Washington 99352 7910 Woodmont Avenue Bethesda, Maryland 20814 Mr. I. Charak , Manager '

NRC Assistance Project y Mr. R. B. Borsum Argonne National Laboratory Nuclear Power Generation Division 9700 South Cass Avenue

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Babcock a Wilcox Argonne, !111nois 60139 7910 Woodmont Avenue, Suite 220 3 Beteesda, Maryland 20814 James G. Keppler, Regional Administrator Cherry & Flynn U.S. Nuclear Regulatory Comission, Region III Suite 3700 799 Roosevelt Road Three First National Plaza Glen Ellyn, Illinois 60137 .

Chicago, F111nois 60602 '

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, .Mr. J. W. Cook cc: Commander, Naval Surface Weapons Center ATTN: P. C. Huang White Oak ~

Silver Spring, Maryland 20910 Mr. L. J. Auge, Manager Facility Design Engineering Energy Technology Engineering Center P.O. Box 1449 Canoga Park, California 91304 Mr. Neil Gehring U.S. Corps of Engineers NCEED - T ,

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

Atomic Safety & Licensing Board U.S. Nuclear Regulatory Commission  :!

Washington, D. C. 20555 i

Mr. Ralph S. Decker Atomic Safety & Licensing Board ...

L 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-Jerry Harbour, Esq.

Atomic Ssfety and Licensing Board U.S. Nuclear Regulatory Commission

. Washington, D. C. 20555 Geotechnical Engineers, Inc.

j . ATTN: Dr. Steve J. Poulos

, 1017 Main Street

'. Winchester, Massachusetts 01890 i

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ENCLOSURE 1 RECORD OF TELEPHONE CONVERSATION l

DATE: March 8, 1982, 3:30 pm PROJECT: Midland l l

RECORDED BY: Joseph D. Kane CLIENT:

TALKED WITH: Bechtel CPC GEI NRC J. Andcrson T. Thruvengadam S. Poulos J. Kane i M. Das Gupta K. Razdan i ROUTE TO: INFORMATION G. Lear L. Heller D. Hood F. Rinaldi S. Poulos H. Singh R. Landsman J. Kane MAIN SUBJECT OF CALL: ADOPTED SOIL SPRING STIFFNESSES USED IN DESIGN OF AUXILIARY BUILDING UNDERPINNING AND START OF PHASE 2 CONSTRUCTION ITEMS DISCUSSED:

1. Attachments 1 and 2 to this telephone record provide' the design cases and soil spring stiffnesses adopted by Bechtel as soils input in their structural analysis of the Auxiliary Building. The values of stiffness also on Attachnent 2 under the column labeled NRC are the results of extensive discussions between NRC Consultants, S. Peulos, GEI, H. Singh, COE and J. Kane, NRC and represent the staff and its Consultants determination of the range of reasonable stiffness values which should be considered in design. The NRC values had been provided to Bechtel via telephone on March 5,1982 as committed to by the Staff in the meeting of February 26, 1982 in Bethesda.

The NRC reconnended value of 70 KCF for the Main Auxiliary Building versus the Ar rlicant's adopted 30 KCF for Case 2 is ircportar i because this diff erence has the potential to affect settlements which are to be tolerated duritig underpinning. Allowable settlements using the stiffness of 30 KCF had been provided on February 26, 1982 by M. DasGupta of Bechtel Cnrp.

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2. Following considerable discussion on NRC recommended stiffness values (in both March 5 and March 8 telephone calls), Consumers expressed a willingness to use these values in their structural analysis but indicated the time needed to complete the required computer runs would impact their Phase 2 construction plans. As an alternative, J. Kane suggested that Phase 2 work be subdivided into two parts, the initial one beginning with work which would not affect the EPA and Control Tower area and the second part beginning after the analysis using the NRC recommended stiffness values had been completed by CPC and the results evaluated by the NRC staff. An acceptable line of demarcation between these two portions of Phase 2 work was tentatively identified as column lines 2.5 and 10.5 on the Construction Sequence drawing provided for the underpinning work at the February 3-5 design audit. These lines, respectively, are sufficiently west and east of the EPA and Control Tower to conclude that these structures would be unaffected by underpinning operations permitted by this initial portion of Phase 2 work.

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3. Consumers agreed to provide a letter to NRC giving details which would permit the Staff.to fully understand what work would be performed under this initial portion of Phase 2 work.
4. The following comments were given to Consumers concerning the monitoring plans during underpinning of the Auxiliary Building.
a. Drawing C-1493(Q), " Monitoring Matrix," should be updated and values provided in the tolerance criteria column for staff concurrence before any portion of Phase 2 work is started.
b. Sheet 8 of M. DasGupta's presentation on February 26, 1982 does not dgree with previets drawings provided (Drwgs. C-1490 (Q) and C-1491 (Q)). Corrections in proper labeling of the deep seated bench mark locations on Sheet 8 and on Sheet 10 are needed and should be provided to the NRC. '
c. NRC expressed a concern for measurement of horizontal movement between the EPA and the Turbine Building e. d between the Control Tower and the Turbine Building during underpinning operations cnd suggested three monitoring devices be installed. One device at the top of each wing of the EPA's and one at the top of the Control Tower was recommended.

Consuners responded that they were now planning to place instruments at those locations in response to questions raised by ;SLB but had not ,

yet updated the monitorint locations on Drawings C-1490(Q), C-1491(Q) and C-1493(Q). The Staff indicated that criteria on tolerable relative horizontal movement for these instruments should be established and furnished on the Monitoring Matrix drawing along with the basis for thece limitt.

d. As previously discussed at the February 26, 1982 meeting in Bethesi ,

the Staff anticipates a submittal by Consumers identifying the acceptance criteria for the strain gages to be placed at El.659 on the Auxiliary Building.

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5. Consumers indicated that the six deep seated bench mark instruments l located on Sheet 8 of M. DasGupta's presentation will be in operation before beginning Phase 2 work. Installation of the additional instruments at top of the EPA's and Control Tower and the. strain gages at El 659 and the results of the structural analysis using NRC recommended stiffness valves are to be completed before the second portion of Phase 2 work is started.
6. J. Kane indicated that subdivision of Phase 2 underpinning work into two portions is subject to the approval of NRC Project Management and Structural Engineering Branch. It was also indicated that other conditions which could affect the start of Phase 2 work may be identified by the Staff. The original intent of this telephone conference call was to discuss soil spring stiffnesses but was not intended to address the start of Phase 2 work.

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