ML19320C828

Forwards Request for Addl Info Re Plant Fill to Support Required Geotechnical Engineering Studies for Review of Responses to NRC 791119 Request

ML19320C828
Person / Time
Site:	Midland
Issue date:	06/30/1980
From:	Schwencer A Office of Nuclear Reactor Regulation
To:	Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
References
NUDOCS 8007180081
Download: ML19320C828 (9)

Text

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JUN 3 ^ @

Docket Nos.:

50-329/330 Mr. J. W. Cook Vice President Consumers Power Company 1945 West Parnall Road Jackson, Michigan 49201

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION REGARDING PLANT FILL We have reviewed your responses to our requests of November 19, 1979 regarding the quality of plant fill, effects and remedial actions result-ing therefrom. Our review is being performed with the assistance of the U. S. Army Corps of Engineers. We and they find that the results of additional explorations and laboratory testing identified in Enclosure 1 (Request 37) are needed to support required geotechnical engineering studies.

Details on the extent of these studies will be provided shortly by separate correspondence. is provided in order that you may initiate planning of the required explorations in a timely manner.

How-ever we suggest you await receipt of these further details prior to physically beginning the exp h rations. (Footnote 4 of Table 37-1) also includes requests for advanced notification of the availability of certain samples.

As noted in our Request 37 of Enclosure 1, your position in previous responses to Requests 5 and 35 not to complete additional explorations, sampling and laboratory testing after preloading continues to be unaccept-able to us.

So that you might better understand our position, we offer the following observations:

(1)

The preload program as completed on the heterogeneous materials which were placed for the purpose of structural fill is not necessarily an improvement, nor does it necessarily produce founda-tion soils of more unifom engineering properties, compared to the soil performance which would have resulted if the material had been properly compacted to the original requirements established in the Midland PSAR.

(2)

To develop reasonable assurance of plant safety, the required studies are needed to serve as an independent verificaticn of the predictions of future settlements and the conclusions of the preload program.

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Mr. J. W. Cook JUN 3 0 80 (3)

The required studies will permit an estimate of total and differential settlement for involved structures and systems following drawdown "with the proposed permanent dewate' ring system.

(4)

Certain aspects of the preload program, such as the complication introduced by the simultaneous raising of the cooling pond reservoir, present difficulties in our full acceptance of your conclusion of the preload program. also includes other requests for infomation which we and the U. S. Army Corps of Engineers need to continue our review.

We would appreciate your response to Enclosure 1 at your earliest opportunity.

A partial reply based upon data already available shou'id be submitted rather than to await the results of new' borings and tests contained in parts of Enclosure 1.

Should you require clarifications of these requests and positions, please contact us.

Sincerely,

• le f//ld G A. Schwencer, Acting Chief Licensing Branch No. 3 Division of Licensing

Enclosure:

As stated cc: See next page -

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cc: -Michael I. Miller, Esq.

Isham, Lincoln & Beale Suite 4200 1 First National Plaza Chicago, Illinois 60603 Judd L. Bacon, Esq.

Managing Attorney s

Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Mr. Paul A. Perry, Secretary Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Myron M. Cherry, Esq.

1 IBM Plaza Chicago, Illinois 60611 Ms. Mary Sinclair 5711 Summerset Drive Midland, Michigan 48640 Frank J. Kelley, Esq.

Attorney General State of Michigan Environmental Protection Division 720 Law Building Lansing, Michigan 48913 Mr. Wendell Marshall Route 10 Midland, Michigan 48640 Grant J. Merritt, Esq.

Thompson, Nielsen, Klaverkamp & James 4444 IDS Center 80 South Eighth Street Minneapolis, Minnesota 55402

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cc: Commander, Naval Surface Weapons Center ATTN:

P. C. Huang G-402 White Oak Silver Spring, Maryland 20910 i

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 NCEED - T 7th Floor i

477 Michigan Avenue i

Detroit, Michigan 48226 e

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ADDITIONAL REQUESTS RECARDING PLANT FILL 36.

We have reviewed your response to Request 24 and find that information from additiona'i boring logs is needed.

Provide the boring logs for the following explorations:

a.

Pull down holes PD-1 thru PD-27 (35 holes that include 8A, 20A, 208, 20C, 15A, 158, 15C and 27A) b.

LOW-1 thru LOW-14 (14 holes) c.

TW-1 thru TW-5 and PZ-1 thru PZ-48 (55 holes)

I d.

0W-1 thru OW-5 (5 holes) e.

TEW-1 thru TEW-8 (8 holes)

The logs should include date and method of drilling, the type and location of samples attempted. Also provide tne locations, boring logs and available test data of any exploration completed in 1979 and 1980 which has not yet been submitted.

37.

Your position in previous responses to Requests 5 and 35 not to (RSP) complete additional explorations, sampling and laboratory testing following the preload program continues to be unacceptable. We require that you complete as a minimum, the exploration and test-ing program indicated by Table 37-1, 38.

Discuss the foundation design for any seismic safety-related piping and conduit connected to or located under the Radwaste Building and Turbine Building where piping and conduit have been placed on plant fill.

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Page 1 of 2 Table 37-1 Request for Additional Explorations, Sampling. and Testing, 2

N Anticipated Geotechnical 6]

Location N Depth _/

Sampling Lab Testing Engineering Studies to be Required Diesel Generator

!Thrufillanda Classify samples For cohesive soils Bearing Capacity Building

! minimum of 5' according to C-D (Consolidated-Drained)

Settlenent (6 holes along iinto natural Unified Soils C-U (Consolidated-Undrained)

Piping Distortion perimeter)

! glacial till soils Classification Consolidation 5/

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, System For sands Drained Direct Shear on both loose & dense speci-mens j

Relative Density I

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Auxiliary Building Same as above Same as above Same as above except Caisson Foundation (2 holes) add U-U (Unconsolidated-Design (Vertical and i

Undrained for cohesive Lateral Load Support) soils Service Water Pump, (1 holeh Same as above Same as above Same as above except con-Pile Foundation Design StructureAand Re-I solidation testing would (Vertical and Lateral Load f

taining Walls (2 holes) l be limited to samples in Support) retaining wall foundations.

' Retaining Wall Stability &

Settlement.

I Cooling Pond Em-Extend thru fill For cohesive soils bar.anents and a minimum of Same as above (7 '.. oles along 5' into natural C-D (Consolidated-Drained)

Slope Stability Nrimeter) residual soils ex-C-U (Consolidated-Undrained)

Fill compaction adequacy cept hole no. 5 U-U (Unconsolidated-Undrained) which should extend to bottom elevation of cooling pond.

NOTES: See page 2

Page 2 of 2 Table 37-1 (continued)

NOTES:

1/ See attached Figs. 37-1 and 37-2 for approximate boring location. Holes to be accurately located in the field to avoid obstructions, underground piping and conduits and slurry trench area.

2/ No boring is to be terminated in loose or soft soils.

3/ Continuous split spoon sampling using SPT is required. Holes are to be held open using either casing or hollow stem auger. Additional borings to obtain representative undisturbed samples for detailed laboratory testing should be located at the completion and elevation of the split spoon sampling progrcm. The groundwater level should be recorded at the completion of drilling in all borings once the level has stabilized.

4/ Normal classification (e.g., gradation Atterben7 Limits) unit weight and coisture content testing to be performed on representative samples from each significant foundation layer. This column pertains to lab testing in addition to the above mentioned tests.

It is requested that at least one week notice be provided to the NRC before opening undisturbed samples to permit on site visual observation by Corps of Engineer representative.

5/ The maximum load should be great enough to establish the straight-line portion of the void ratio-pressure curve.

-6/ Details on the extent of geotechnical engineering studies to be completed using the results of field and lab testing work will be provided in a separate letter.

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