ML20077J135
| ML20077J135 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 08/02/1983 |
| From: | Mooney J CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Harrison J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 23882, JNL-31-83, NUDOCS 8308150256 | |
| Download: ML20077J135 (10) | |
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CORSumBIS power lixecutive Atanager 0
AfiJiand Project Office General off kes: 1945 West ParnaH Floed, Jackson, MI 49201 e (517) 788-0498 August 2, 1983 JNL 31-83 l FRWCIPR _SMFF l d F_!
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F1 LO TM 799 Roosevelt Avenue Glen Ellyn, IL 60137 MIDLAND ENERGY CENTER MIDLAND DOCKET NOS 50-329, 50-330 TRIAXIAL TEST RESULTS - AUXILIARY BUILDING FILE: 0485.16, C-125B(QR)
SERIAL: 23882
REFERENCE:
CPC0 LETTER (J A MOONEY) TO NRC (J J HARRISON) DATED 6/19/83 SERIAL CSC-6735 The purpose of this letter is to closeout the commitment in the reference for providing the Auxiliary Building triaxial test results. The~ enclosed report presents the results of tests performed for piers W11, E8 and W8.
It should be noted that these tests have been performed in accordance with Appendix A to the report, " Guidelines for Thin-Walled Tube Sampling of Pier Subgrade," by Hanson Engineers, Springfield, IL and are for information only. The design has been based on earlier tests.
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JAM /JNL/bjw CC RJCook, Midland Resident Inspector JGKeppler, Administrator, NRC Region III DSHood, US NRC RBlandsman, US NRC OL/0M Service List 4
Ill oc0783-0534a100 g
983 8308150256 830802 PDR ADOCK 05000
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SERVICE LIST Frank J Kelley, Esq Atomic Safety & Licensing Attorney General of the Appeal Panel State of Michigan U S Nuclear Regulatory Commission Carole.Steinberg, Esq Washington, DC 20555 Assistant Attorney General Environmental Protection Division Mr C R Stephens (3) 720 Law Building Chief, Docketing & Services Lansing, MI 48913 U S Nuclear Regulatory Commission Office of the Secretary Washington, DC 20555 Myron M Cherry, Esq Suite 3700 Ms Mary Sinclair Three First National Plaza 5711 Summerset Street Chicago, IL 60602 Midland, MI 48640 Mr Wendell H Marshall William D Paton, Esq RFD 10 Counsel for the NRC Staff Midland, MI 48640 U S Nuclear Regulatory Commission Washington, DC 20555 Charles Bechhoefer, Esq Atomic Safety & Licensing Atomic Safety & Licensing Board Panel Board Panel U S Nuclear Regulatory Commission U S Nuclear Regulato'ry Commission Washington, DC 20555 Washington, DC 20555 Dr Federick P Cowan Ms Barbara Stamiris 6152 N Verde Trail 5795 North River Road Apt B-125 Rt 3 Boca Raton, FL 33433 Freeland, MI 48623 Carroll E Mahaney Jerry Harbour.
Babcock & Wilcox Atomic Safety & Licensing PO Box 1260 Board Panel Lynchburg, VA 24505 U S Nuclear Regulatory Commission Washington, DC 20555 James E Brunner, Esq M I Miller, Esq Consumers Power Company Isham, Lincoln & Beale 212 West Michigan Avenue Three First National Plaza Jackson, MI 49201' 52nd Floor Chicago, Il 60602 Mr D F Judd John Demeester, Esq Babcock & Wilcox Dow Chemical Building PO Box 1260 Michigan Division Lynchburg, VA 24505 Midland, MI 48640 Steve-Gadler, Esq Ms Lynne Bernebei 2120 Carter Avenue Government Accountability Project' St Paul, MN 55108 1901 Q Street, NW Washington, DC 20009 miO583-0429a100
RESULTS OF THE
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TRIAXIAL TESTING FOR THE AUXILIARY BUILDING UNDERPINNING The purpose of this report is to sucmarize the guidelines for taking thin-walled tube samples in designated piers, and to present the results of labo-4 ratory tests performed on selected tube samples taken to date. Tube samples are taken to provide relatively undisturbed samples of pier subgrade soils suitable for performing unconsolidated-undrained triaxial shear strength tests. These shear strength test results can then be conpared to the average shear strength used in design.
Piers designated for tube sampling are W 11, E/W 2, 5, and 8, and CT 3, 10 and 14.
To date, tube samples have been obtained in piers W 11, W 8, and E 8.
At designated piers, two (2) thin-walled tube samples are obtained according to the guidelines in Appendix A (except as noted in Table 1 for Pier W 11).
The tubes are sent to the laboratory of Hanson Engineers in Springfield, Illinois for testing. The testing program consists of determining water content, vet density, Atterberg limits, and shear strength from unconsolidated-undrained triaxial compression tests performed on selected portions of the samples. Ihree (3) triaxial tests are performed using confining pressures of 15, 30, and 45 psi.
The laboratory test results obtained to date are summarized in Table 1 of this report.
The Mohr's circles for the triaxial test results are included in Appendix B of this report.
The average of the data shown in Table 1 can be compared to the average anticipated design values for pier subgrade soils which are given on Bechtel Design Drawing C-1304 (Q), Rev. 1, as summarized below:
Design Measured Water Content 20%
21.2%
Liquid Limit 42%
47.1%
Plastic Limit 20%
18.8%
Wet Density 130 pcf 130.2 pcf Undrained shear strength 7 ksf 7.3 ksf The measured range of undrained shear strength values of 6.2 to 8.0 ksf is within the anticipated range of 5 to 10 ksf. As expected, the natural soils encountered near the pier subgrade elevation have been consistent with the
-design basis.
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STS/ WORK 3
TABLE 1 y
SUMMARY
OF LABORATORY TEST RESULTS t
l UNCONSOLIDATED-UNDRAINED INDEX PROPERTIES TRIAXIAL TEST RESULTS Water Liquid Plastic Wat Conf. Shear Average Pier Sample Elev.
Cont. Limit Limit Unit Pres. Strength Shear,
No.
No.
Ft.
Weight PSI KSF Strength (3)
(3)
KSF s
W 11(1)
IU-3 565.3 19.7 132.5 15 7.4 W 11(1)
IU-2 565.7 21.3 43.1 19.1 131.4 30 8.0 7.7 W 11(1)
IU-1 566.0 21.5 130.6 45 7.8 W 8(2)
S-1 565.6 20.0 130.0 15 6.8 W 8(2)
S-2 565.6 20.6 49.2 18.4 130.3 30 6.2 6.8 W 8(2)
S-2 565.3 20.6 131.5 45 7.4 l
E 8(2)
S-1 564.3 23.1 127.3 15 7.1-E 8(2)
S-1 564.0 23.9 49.1 18.8 126.7 30 6.7 7.2 E 8(2)
S-2 564.4 20.5 131.3 45 7.9 (1) Tube advanced using jacking system.
Only one tube sample was obtained in Pier W 11.
(2) Tube advanced by driving.
(3) One set of Atterberg limits performed from tube sample at each pier location: for E 8 and W 8 the samples were obtained by combining portions of both tube sampics.
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APPENDIX A GUIDELINES FOR THIN-WALLED TUBE SAMPLING OF PIER SUBCRADE i
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L GUIDELINES FOR THIN-WALLED TUBE SAMPLINd 0F PIER SUBGRADE PURPOSE The purpose of this procedure is to provide a method for using thin-walled tubes to obtain soil samples suitable for laboratory testing from the subgrade of piers at the Midland Nuclear Plant.
SCOPE j
The piers to be sampled using this procedure are E/W 2, 5, 8, and CT 3, 10, 14 and at other locations as determined by the RGE.
PROCEDURE Af ter the pier shaf t has been excavated to approximately one foot above the design subgrade elevation, the bottom of the excavation shall be cleared of loose materi-l al.
The sample tube shall be a 14.5 inch long steel tube with a two inch outside diameter and a 1/16 inch wall. Other tubes acceptable to the resident geotechnical engincer may be used.
Place the sample tube with a coupler attached to the top in a vertical position on the bottom of the excavation. Place a cushion such as wood blocking on top of the coupler and advance the tube using a sledge hammer.
Care shall be taken to maintain the tube as vertical as possible and to reduce the tendency for swaying during driving. After determining that the tube has reached adequate depth, record the depth of penetration. Before removing the tube, rotate the tube at least two full revolutions to shear the sample at the bottom. -Measure and record the length of the sample obtained. The job number, sampling date, pier number, sample number, and sample elevations (top and bottom of sample) shall be shown on the tube. The tube may also be advanced using a hand-operated jack, braced as necessary, using as uniform and penetration rate as possible.
Remove any loose material from the upper end. Trim at least k inch of material from the lower end.
Seal both ends with wax. Microcrystalline wax is preferable, but paraffin may be used. After waxing, fill the space in the upper end of the tube with a filler such as rags or newspaper.
Securely tape both ends and seal again with wax.
The tube sample shall be shipped in a cardboard tube with an annular space between the sample and the cardboard wall filled with a cushioning material such as styrofoam pellets.
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l APPENDIX B TRIAXIAL TEST RESULTS Piers W 11, E/W 8 i,
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