ML19310A898
| ML19310A898 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 04/30/1980 |
| From: | Mccallister P ARMY, DEPT. OF, CORPS OF ENGINEERS |
| To: | Rolonda Jackson Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19310A896 | List: |
| References | |
| NUDOCS 8006300655 | |
| Download: ML19310A898 (6) | |
Text
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DEPARTMENT OF THE ARMY
/c,JWIh Orrnoir oisvaret. comes or zweimaans so x soar DErnOIT. helCH84AM 48238 a
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SUBJECT:
NRC Midland Project, Request for Additional Borings and Existing Soil Data - Revision No. I U.S. Nuclear Regulatory Commission Dr. Robert E. Jackson Division of Systems Safety
411 Stop P-314
'4ashington, D.C. 20555
Dear Dr. Jackson:
Inclosure i to our letter of 27 March 1980 has been revised and attached hereto.
The two maps provided indicating boring locations remain unchanged.
FOR THE DISTRICT ENGI.YF.ER
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INCLOSURE I 1.
It is requested that the applicant furnish the boring logs listed below indicating when arid how these were taken, the type of sampling, and samples taken:
e Pull down holes PD-1 thru PD-27* (35 holes)
LOW-1 thru LOW-13 & W-1 thru W-4 (18 Holes)
TW-1 thru TV-5 & PZ-1 thru PZ-48 (53 holes)
OW-1 thru OW-3 & OL-1 thru OL-6 (~ hoJas)
TEW-1 thru TEW-7 & Q-1 thru Q-12 u.- holes)
- Includes BA, 20A, 20B, 20C, 15A, 153,15C, & 27A.
- 2. Locations, boring logs and test data from any other drill holes taken in 1979 and 1980 are also requested.
3.
Dutch cone penetrometer data from holes P-1 thru P-13 suse also be provided.
4 Information is requested on all piezometers that were installed to monitae problems related to plant fill. The informatin should include the number and location, the time of installation, the type of filter around the piezonater, the installed depth, and the type of piezometer.
5.
All piezometer readings for each installation with dates and times are required.
6.
The data and information requested in paragraphs 1 thru 5 above is needed to verify the applicant's computations and conclusions and to make any needed computations for the dewatering analysis, the seismic analysis and the settlement analysis.
7.
A need exists for additional borings, since random exploratory borings throughout the plant site have revealed pockets of sof t clay subject to settlement and or consolidation and loose sands subject to liquefaction. A need also exists to check the results of the proposed remedial measures of surcharge loading at the Diesel Generator Building and the dewatering plan.
a.
In the case of the Diesel Generator Building, check borings nust be -
nade in the vicinity of borings which identified low ~3" values in the clay and sand fill. The proposed borings shall be carried into the 3 acial till 1
and all samples, including those in the 3 acial till, tested as indicated 1
below.
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The, boring locations are as indicated on the attached map.
All soil for the full depths of the borings shall be classified according to the Unified Soil Classification System. Any tests necessary to classify the soil shall be accomplished. ~ Unit weight and moisture contenc of all samples should also be determined. The samples obtained from any cohesive strata shall be tested.
The tests for cohesive material shall be a consolidation drained and undrained triaxial shear tests (R&S) and a consolidation test with restraining load
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equal to the load in place at the strata depth the sample represents.
The sands shall be tested in direct shear for a loose and dense condition and the relative density of the sand in situ decernined.
b.
Where piling or caissons are proposed to underpin the Service Water 3uilding and Auxiliary Building - feed water valve pits which are located on fill, the load bearing capacity of the bearing strata aust be determined. The capability to resist lateral shearing stresses that could be induced in low "N" value soil subjected to maismic action aust also be determined. The same tests required for soil samples obtained from the new borings at the Diesel Generator Building shall also be made on soil samples from new borings for j
these buildings.
c.
The questionable site area fill may have a counterpart in the cooling pond embankment which was constructed contemporaneously with the site fill.
It is requested that exploratory continuous drive borings be taken at a number of points along the north and east embankments, omitting c5s slurry trench
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cutoff areas which are positively sealed. The approximate aoring locations are as indicated on the attached map of the cooling pond. Upon completion of drive boring a second undistrubed boring shall be made adjacent oc the disturbed boring to sample cohesive soils. The tests on the soil samples obtained from the borings in the embankments shall include the following tests, consolidated - drained triarial shear tests, (cohesive samples)
Atterberg limits and all soils classified according to the Unified Soil Classification System. Tha drive borings shall be continously sampled usin'g a standard split spoon sampler. The hole shall be held open using a hollow )ces auger or casing. Particular attention shall be paid to ground water conditions during and af ter completion of drilling.
In the case of Hole 5, the boring should be drilled to the depth of the cooling pond bottom while the remaining borings need penetrata only 5 feet into underlying residual soils unless soft ground indicates a need for further hole penetration.
3.
Summary of Requested Drilling a.
Diesel Generator Building 6 holes around the perinecer of the building. Samples of all strata from ground surface into the glacial till (Holes S-13).
Include downhole, crosshole and surface geophysical tests to establish insitu compression and shear zoduli for floor response spectra design check mentioned on pg.18 Q VII-4 of Interis SER.
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O b.
Auxiliary Building - Take two borings around the proposed support piling or caisson for remedial grouting of loose sands and soft clays adjacent to pile or caisson to stiffen piles and adjoining ground against lateral loading.
Borings need to penetrate to glacial till.
(see attached map for boring locations - Holes 4 & 5.)
c.
Service Water Building - A boring (Hole 16) shall be made as indicatad on the attached map to and into the glacial till. All samples obtained shall be classified according to the Unified Soil Classification System also consolidation, drained and undrained triaxial compression tests made on cohesive soil samples and direct shears for a loose and dense condition shall be made on all granular soil samples, as specified in paragraph 7B.
d.
Plant Area Borings - if feasible some borings should be taken under the Radwaste and Turbine Buildings to determine if 2nwatered pockets exist or persist. Suggested boring locations would be as indicated on the attached nap.
Further investigation could be needed af ter the results of these borings are obtained. No borings presently exist in these areas. The borings should be cased or hollow stas auger borings with drive samples every 2-1/2 feet through the fill. The holes should be converted to dewatering holes or used for piezometers (Holes 1, 2, 3, 6 & 7).
e.
The s' 'e visit of 27 or 28 February 1980 turned up two differential settlenent poines on the retaining wall adjacent to the Service Water Pump Structure. Two borings, Holes 14 and 15 as indicated on the attached map shall be taken to investigste this problem. Tests required are consolidatica tests, criaxial compression tests, Atterberg limits ami sradation tests made on cohesive soils, and direct shear for loose and de.nse conditions and gradation tests made on granular soils.
f.
In all new borings made, the water table shall be determined.
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