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- WINCHESTER MASSACHUSETTS 08890 (617) 729 1625 m,n.c, m
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"IoTIIEU"Y October 7, 1982 Project 81907 File 2.0 Ref: 81907-17 Mr. Joseph Kane Project Officer U. S. Nuclear Regulatory Commission Division of Engineering, M/S P-214 Washington, D.C. 20555
Subject:
Location of Data on Underpinning Dimensions and Load Transfer Procedures Midland Plant Underpinning Dear Mr. Kanes At your request we have compiled the enclosed Tables 1 and 2 which contain the subject information.
Due to the long period
- over which the information was provided to NRC and due to changes in design and procedures that the Applicant made during that period, the subject data have not been consolidated in a few drawings and specifications.
For the purposes of aiding NRC while following the progress of the work, we recoinnend that the Applicant be requested to furnish the NRC, in one submittal, the following drawings and specifications for the Auxiliary Building and for the Service Water Pump Structures 1.
Design drawings showing dimensions and locationc of under-pinning piers and walls 2.
Specifications and/or design drawings that contain a descrip-tion of the procedures that will be used to transfer the jacking loads, in stages, from the first temporary supports to the final underpinning wall Y ls-jm,n w
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Mr. Joseph Kane October 7, 1982 1
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It would be desirable for the above information to be made available
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prior to or å the forthcoming site visit.
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' Sincerely yours, GEOTECHNICAL ENGINEERS INC.
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'I ss' TABLE 1
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j Location of Data i
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I Underpinning Dimensions and Load Transfer Procedures i
Auxiliary Building and Service Water Pump Structure
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t MIDLAND PLAlff UNDERPINNING Geotechnical Engineers Inc.
October 7, 1982 SERVICE WATER PUMP STRUCTURE Dimensions of Underpinning Wall Bechtel Drawing 7220-C-2035 dated 11/9/81
-2036 dated 11/9/81 Load Transfer Procedures Specification 7220-C-194 undated Testiraony before ASLB Draft dated 12/31/81 Sections 4.3 and 8.3 AUXILIARY BUILDING (EPA's and CT)
Dimensions of Underpinning Walls
-l See Table 2 Load Transfer Procedures Bechtel Specification 7220-C-195 (Q) Rev. O, Sect. 6.3 Undated. Received July 27, 1982 1
Mergentime Drawing 874 dated 7/23/82 S74a dated 7/23/82 Dechtel Drawing 7220-C-1445 (Q) dated 6/9/82
-1445-1 (Q) dated 6/9/82 Jack stands Bechtel Drawing 7220-C-1409-2 undated 1409-4 undated I
Drawings received July 27, 1982 Jack supports I
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TABLE 1 (continued)
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4' Bechtel Drawing 7220-C-0101 Rev O, undated Received July 27, 1982 Construction Sequence, Plan and Logic 3, -
AUXILIARY BUILDING (FIVP) i Design of Underpinning Fills See Table 2 Load Transfer Procedure Specification 7220-C-195 (Q) would apply to this operation. No further details were provided by the Applicant.
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TABLE 2 S
- Drawings Showing Pier Dimensions
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Electrical. Penetration Areas and Control Tower
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-l MIDLAND PLANT UNDERPINNING a;-
J'l Geotechnical Engineers Inc.
October 7, 1982
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ft Pier Source /Date Size (ft)
I Coltan Bell CONTROL TOWER E-Hg Merg. S73, June 9,1982 6x6 12 x 12 W-HK Audit July 27, 1982 CT 1,2,3, Merg. S80, June 9,1982 3x6 14 (North-5,6,7, Audit July 27, 1982 South) 1 8,10,11, Fig. AUX 35 9 (East-12 Audit January 18-19, 1982 West) i CT 13 Merg. S80, June 9,1982 6x6 14 (East-CT 14 West)
CT 15 Audit February 1-5, 1982 6x6 14 x 14 Calculation sheet by J. Ross, 11/23/81. Calc.
DQ-50(Q) Riv. O, Sht. 0 i
CT 13A,B,C Audit July 27, 1982 - rough 6 (E-W)
Not given i
14A,B,C sketch and verbal 15A,B,C 4.
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EPA's Size I
Entire Applicant's ASLB Testimony, Concrete under prac-
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Nov. 19, 1981 by Burke, Corley, tically all of EPA j
Gould, Johnson, Sosen Fig. AUX 22
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Audit July 27, 1982 - verbal Small spaces not filled
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with concrete in AUX
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concrete. Thus, all of 4
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concrete.
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TABLE 2 (continued)
FIVP's Size 4
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East and Applicant's ASLB Testimony, Backfill: 4-ft-thick West
_ Nov. 19, 1981 by Burke, Corley, concrete mat,1-ft-Gould, Johnson, Sosen thick jacking slab, AUX 22 and about 29 ft of com-l pacted granular fill.
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[d,...,IS, UNITED STATES
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i NUCLEAR REGULATORY COMMISSION y
WASHINGTON. D. C. 20556 I,[ $ /
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Docket Nos: 50-329/S0-330 OM, OL APPLICANT:
Consumers Power Company FACILITY:
Midland Plant Units 1 & 2
SUBJECT:
TELEPHONE DISCUSSIONS OF JANUARY 11 & 12, 1983 REGARDING UNDERPINNING SETTLEMENT READINGS On January 11 and 12, 1983, the NRC and its consultant from Geotechnical Engineers, Inc. (GEI) participated in a telephone discussion with Consumers Power Company (CPC) and Bechtel. The call primarily discussed settlement records for deep-seated benchmarks associated with under-pinning construction of the two Electrical Penetration Areas (EPA's) located at the southern portion of the Midland Auxiliary Building.
CPC's plans for underpinning the EPA's and the Service Water Pump Structure (SWPS) are described in Supplement 2 of the Safety Evaluation Report (NUREG-0793, October 1982).
Enclosure.1 is a record of this telephone conversation.
Darl Hood, Project Manager Licensing Branch No. 4 Division of Licensing
Enclosure:
As stated cc: See next page i
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MIDLAND ir Mr. J. W. Cook Vice President
' Constners Power Company 1945 West Parnall Road Jackson, Michigan 49201 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 Three First National Plaza, Lansing, Michigan 48909 51st floor Chicago, Illinois 60602 Mr. Steve Gadler 2120 Carter Avenue James E. Brunner, Esq.
St. Paul, Minnesota 55108 Constners Power Company 212 West Michigan Avenue U.S. Nuclear Regulatory Commission Jackson, Michigan 49201 Resident Inspectors Office 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 Assistant Attorney General State of Michigan Environmental Mr. Paul A. Perry, Secretary Protection Division Constners Power Company 720 Law Building
- 212 W. Michigan Avenue Lansing, Michigan 48913 Jackson, Michigan 49201 Mr. Wendell Marshall Mr. Walt Apley Route 10 c/o Mr. Max Clausen Midland, Michigan 48640 Battelle Pacific North West Labs (PWL),
Battelle Blvd.
Mr. Roger W. Huston SIGMA IV Building Suite 220 Richland, Washington 99352 7910 Woodmont Avenue Bethesda, Maryland 20814 Mr. I. Charak, Manager NRC Assistance Project Mr. R. B. Borsum Argonne National Laboratory Nuclear Power Generation Division 9700 South Cass Avenue Babcock & Wilcox Argonne, Illinois 60439 7910 Woodsont Avenue, Suite 220 Bethesda, Maryland 20814 James G. Keppler, Regional Administrator U.S. Nuclear Regulatory Comission, Cherry & Flynn Region III Suite 3700 799 Roosevelt Road Three First National Plaza Glen Ellyn, Illinois 60137 l
Chicago, Illinois 60602 I
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'l Mr. J. W. Cook,
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cc: Lee L. Bishop Hamon & Weiss 1725 I Street, N.W., Suite 506 Washington, D. C.
20006 Mr. Ron Callen Michigan Public Service Commission 6545 Mercantile Way P.O. Box 30221 Lansing, Michigan 48909 Mr. Paul Rau Midland Daily News 124 Mcdonald Street Midland, Michigan 48640 Billie Pirner Garde Director, Citizens Clinic for Accountable Government Government Accountability Porject Institute for-Policy Studies 1901 Que Street, N.W.
Washington, D. C.
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.l' Supplemental page to the Midland OM, OL Service List i
Mr. J. W. Cook 3-
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I a-cc: Commander, Naval Surface Weapons Center
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ATTN:
P. C. Huang White Oak Silver Spring, Maryland 20910 I
Mr. L. J. Auge, Manager Facility Design Engineering Energy Technology Engineering Center P.O. Box 1449
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Canoga Park, California 91304 l
Mr. Neil Gehring j
U.S. Corps of Enginuers NCEED - T 7th Floor
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477 Michigan Avenue Detroit, Michigan 48226 Charles Bechhoefer, Esq.
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 8
Jerry Harbour, Esq.
Atomic Safety and Licensing Board U.S. Nuclear Regulatory Commission 1
Washington, D. C.
20555 '
Geotechnical Engineers, Inc.
ATTN: Dr. Steve J. Poulos 1017 Main Street Winchester, Massachusetts 01890 I
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ENCLOSURE s
RECORD OF TELEPHONE CONVERSATION i
DATE: January 11,1983 9 2:00 PM PROJECT: Midland
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RECORDED BY: Joseph D. Kane 1
TALKED WITH:
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CPC Bechtel SEi NRC
-tj J. Mooney M. DasGupta S. Poulos R. Landsman 4-J. Schaub W. Paris J. Kane 1
T. Thiruvengadam R. Wheeler 4
K. Razdan G. Murray j
R. Ramanujam B. Cuiki i
- J. Darby
- 8. Adler M. Lewis 1
B. Crouse a
ROUTE TO:
J. Knight "
H. Singh, COE G. Lear S. Poulos, GEI' L. Heller R. Landsman, Region III D. Hood J. Kane MAIN SUBJECT OF CALL: To discuss background settlement readings -
l Auxiliary Building Underpinning ITEMS DISCUSSED:
This call had been arranged at the request of NRC to discuss the background 4
(underpinning had not yet started) settlement records provided to NRC for the period from 8/23/82 to 10/14/82. The records provided were for DSB-ANI.
DSB-lE, DS8-2E, DS8-AS4 and DMD-3E. and the ambient air temperatures for the same time frame. Region III had requested that HGEB review the background data and provide comments on the apparent upward movement of the EPA which is indicated by the settlement monitoring program.
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CPC was asked to briefly describe the procedure that was followed to establish the uncorrected and corrected settlement curves which were
'g provided for the deep-seated benchmarks (DS8). The uncorrected curves i
are based on the recorded LVDT readings. The occasional small triangles plotted on the curves are points ashbhshed from the back-up dial gages.
i The corrected curves adjust the uncorrected curves for temperature changes r
measured at,the deep-seated benchmarks (DSB) since the time of initial
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e i1 installation. Temperature changes are measured at each DSB location at l..
depths of 3 ft,15 f t and 50 ft through thennoccuples which were placed Lj during installation. Minimal changes in temperature are being observed
-r below the upper thennocouple.. CPC is to provide the temperature readings 1
with depth to support their position that temperature corrections at DSB-AN1,- DSB-AN2 DSB-lE and DSB-1W are not required in the future. The
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plot of ambient air temperatures which was provided was not used in
' j-corrocting for temperature variations.
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During this call the following infonnation was provided by CPC on a values (See Drawing C-1493(Q) and prior reports for definition of differential settlement, a ).
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Building Monitoring Location Uncorrected Settlement Corrected Settlement
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(in mils as of 1/11/83)
(in mils as of 1/11/83)
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OSB-ANI (North Main uxil.)
68 118
/ OSB-AS4 (South Main Auxil.)
46 63 e-.
DSB-2E (East EPA) 35 43 s
DSB-3E(ControlTower) 22 44 DSB-2W(WestEPA) 27 39 l
Computed values of A) that were given include:
DSB-2E:
aj = -18 mils DSB-3E:
a) = -17 mils DSB-2W:
a) = -15 mils j
j = -10 mils DSB-3W:
a These values are based on uncorrected readings for DSB-ANI and corrected a
readings for the other loctions. The minus signs reflects a magnitude of settlement af the EPA and Control Towers less than the Main Auxiliary 4
Building.
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Additional infonnation provided by CPC included:
i Building Monitoring Actual Settlement (corrected) it Location (in mile as of 1/3/83) 4 i-DS8-2W 29 ii' 058-3W 38
- 4 39 DS8-3E
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DS8-2E 30 i
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Estimated bearing pressures': EPA = 4.5 ksf, Control Tower = 5.2 ksf '
and Auxil. Bldg. = 9.5 ksf i
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Possible exp.lanations for the lahger amount of sett1 ment occurring at ij the north and of the Main Auxiliary Butiding were discussed and included:
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The heavier loaded Auxiliary Building which rests on glacial till 41 may be picking up additional load from the EPA and Control Tower through cantilever actie because the more compressible till beneath the EPA and Control Tower is providing little foundation j[i support.
a5 b.
The EPA is affected mon by changes in temperature than the other d
structures which causes an upward expansion of the EPA..This is i!
reflected as less settlement than the other structures.
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The dewatering for underpinning is causing an uneven immediate i,
settlement over a relatively large area in the thick glacial 11 till layer.
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The NRC Staff.and its consultant made the following recommendations for d
plotting of the settlement data in order to sort out the many variables
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affecting the settlement readings.
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Plot the uncorrected and corrected readings for each monitor location along one line (North Auxil. Bldg /83 this was later agreed to be at
.throughtoControlTower)at ll the noon time ~ interval.
(On1/12 i
lII themidnightinterval). Two settlement history plots on standard 11" by 17" graph par should be developed for each monitoring location.
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One plot would have both, horizontal and vertical (suggested 1 inch =
20 or 40 mils) arithmetic scales and the other plot would graph time
.indays(1,10.-100,1000) on semi-log paper. The temperatures used to correct the data should be plotted on the same graph at the same
' time interval (Temperere plot needed only on settlement graph plotted to arithmetic scales).
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CPC. indicated the requeted settlement plots would be furnished to NRC in about one week's time. This-was noted to be acceptable and will q.
permit staff review prior to any site visit for reviewing underpinning progress (now planned for time when pier load-test of Wil is being conducted).
7.
The' staff and its consultant believe the relatively small. settlement values and the trends of that data whfch have been recorded to date are 7
a result of temperature changes.. It is felt that if sufficient background
- data were available, where comparable temperature and seasonal conditions;
-.d, were repeated, that the effects of sustained temperature changes would 1.i
.be clearer. It is also felt that the apparent upward movement of the EPA tt -
with respect to the other structures will be quickly reversed as underpinning operations progress beneath its foundation slab. The present 4
trend indicated by the settlement readings is favorable with respect to underpinning op, acceptance criteria which has been established to cont the settlement r
erations.
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At the request of R. Ramanujam, CPC, several other items were discussed and included:
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CPC plans to explore for buried utilities in advance of drilling 4
4 the SWPS dewatering wells and soldier piles by using a jet-wash type i i boring (3-1/2" diameter water pipe) which would be inspected by the j
Resident Geotechnical Engineer.. R. Landsman and J. Kane, NRC, agreed that this type of boring would be acceptable.for. attempting to locate utilities when performed in foundattn soils which would eventually.
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- I be removed'aither in underpinning operations or in replacement of q
service water piping.
I There is a concern when using this type of drilling tha,t the jetting and washing action, if not properly controlled, could cause development of voids and loosenin f cohesionless foundation soils.
The NRC staff expressed preference for other types of exploratory z
drilling (e.g., augering) in areas where future foundation stability i
was required.
W. Paris of CPC indicated th4t this position does
- 1 give them problems. At the' staff's' request; CPC is to identify the specific location of proposed borings which will be located in pennanent 1
foundation soils. required to remain stable. This infonnation will be t},
used to guide the staff in a future response on the use of the jet-wash -
type boring.
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R. Landsman indicated that his review of underpinning procedures developed by CPC has identified a problem. The procedures presently indicate that backpacking behind pit excavation lagging is not required when " neat cut" of the pit excavation is made. CPC indicated that the lagging would be essentially in direct contact with the foundation soils when neat cutting was performed. After considerable discussion the major difference became centered on the interpretation of essential and whether the entire length of lagging is required to be in contet or if short, narrow intermittent voids 3
were acceptable behind lagging. All parties dio agree that backpacking 1
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.should be required, even if neat cutting procedures were used, if sufficient voids behind lagging did exist.
It was acknowledgedt that reasonable judggments will have to be made during construction I
when faced with widelz differing conditions of voids that may run from several inches tageveral feet in length behind the lagging.
i It is hoped that the early planned site visit will permit the typical void conditions to be viewed where a consensus of agreement can be reached.
9.
An additional call from J. Kane to R. Landsman and K. Razdan on 1/12/S3 requested that settlement be plotted vertically downward in the conventional engineering manner on the settlement history plots which CPC has agreed to provide. In addition CPC agreed to provide the background readings for the extensometers and strah monitoring.: devices.
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