ML19273B276
| ML19273B276 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 03/20/1979 |
| From: | Hood D Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7904060063 | |
| Download: ML19273B276 (4) | |
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UNITED STATES j
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7, NUCLEAR REGULATORY COMMISSION W ASHINGTON, D. C. 20555 j
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.y MAP 2 01979 Docket Nos:
50-329 50-330 APPLICANT:
Consumer Power Company FACILITY:
Midland Plant, Units 1 & 2
SUBJECT:
SUMMARY
OF MARCH 6,1979 TRIP TO OBSERVE STATUS OF S0ll PRELOAD PROGRAM On March 6,1979, members of the NRC visited the Midland site to observe the status of the preloading program being performed in order to conso-lidate the fill in the vicinity of and underneath the diesel generater building. Participants and contacts are listed in Enclosure 1.
The preload program consists of placing granular fill (sand) inside the dies 'l generator building and for some distance outside the building.
The level of preload at this stage consisted of a 10-foot uniform height.
Further preload operation is dependent upon the applicant's evaluation of the results of this stage. A preload height of 20 feet above final plant grade is the maximum expected.
The preliminary data being obtained on the response to the 10-foot preload was reviewed. The data suggests that additional compaction is being achieved, particularly at the upper levels of the fill. As expected, a rapid rate of settlement was experienced initially in response to the preload, and the rate of settlement generally decreased therea f ter. The preliminary data al.o suggests that the south-east corner of the diesel generator building is settling at a greater rate than the south-west corner. The applicant also noted that the concrete encasement for the condensate line located underneath the western half of the building is now believed to be in direct contact with the building foundation. This situation is being closely monitored and the validity of the measurements is being checked.
The preliminary measurements of ground water behavior beneath the building in response to the preload showed local variations in level.
This tends to further confirm that the fill material under the structure is variable.
The applicant reported that instrumentation previously installed in the tank farm area was being relocated so as not to interfere with con-struction activities.
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. MAR 2 01979 Measurements of an underground service water pipe located between the diesel generator building and turbine building indicate a substantial variation in elevation. The Bechtel representatNe stated that this variation is believed to be due to faulty initial installation, and that the pipe would be replaced upon completion of the preload program.
A general tour of the site was made, including all seismic Category I struc'ures founded upon fill.
The data reviewed durina the trip will be reported in Bechtel's interim report 5 to MCAR 24 and will be forwarded by the applicant to the NRC in April 1979.
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Aru Darl Hood Light Water Reactor Branch No. 4 Division of Project Management
Enclosure:
As stated cc:
See next page
. MAR 2 01979 Consumers Power Company ccs:
Mr. S. H. Howell Michael I. Miller, Esq.
Vice President Isham, Lincoln & Beale Consumers Power Company Suite 4200 212 West Micnigan Avenue One First National Plaza Jackson, Michigan 49201 Chicago, Illinois 60670 Judd L. Bacon, Esq.
Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Mr. Paul A. Perry Secreta ry Consumers Power Ccmpany 212 W. Michigan Avenue Jackson, Michigan 49201 Myron M. Cherry, Esc.
One IBM Plaza Chicago, Illinois 60611 Mary Sinclair 5711 Summerset Drive Midland, Michigan 48640 F rank 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
NRC PARTICIPANTS Darl Hood Division of Project Management, NRR Dan Gillen Geotechnical Engineering Branch, DSE/NRR Abdel Hafiz Structual Engineering Branch, DSS /NRR Gene Gallagher I&E, Region III CONTACTS Consumers Power Comoany Thiru Thiruvengandam Charles Hunt Bob Wheeler Bechtel Charles McConnel Austin Marshall
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Meeting Summary Distribution MAR 2 013h3 Docket Fily J. Knight S. Hanauer NRC POR /
Local POR R. Tedesco R. Bosnak TIC S. Pawlicki NRR Reading F. Schauer LWR #4 K. Kniel E. G. Case T. Novak D. Bunch W. Butler R. S. Boyd V. Benaroya D. Ross D. B. Vassallo R. Saterfield D. Skovholt V. Moore M. Ernst W.Gamuill F. Rosa J. Stol:
R. Denise R. Baer EP Branch Chief
- 0. Parr S. Varga W. Kreger G. Lear C. Heltemes L. Hulman W. Haass D. Gillen, DSE R. Houston A. Hafiz, DSS L. Crocker
- 0. Crutchfield G. Gallagher, IE F. Williams R. J. Mattson R. DeYoung D. Hood Attorney, ELD M. Service IE (3)
ACRS (16)
R. Denise L. Rubenstein