ML20062D061
| ML20062D061 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 11/07/1978 |
| From: | Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | |
| References | |
| HOWE-230-78, NUDOCS 7811170212 | |
| Download: ML20062D061 (7) | |
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u.#cS consumers f poner l
gg g Stephen H. Howeit l
Senior Vice Prendent c a.i ottic..: is4s w..i P.,a.i rio.4, s ca.on, usenis.a 422o1. (s1717ss-o4s2 November 7, 1978 Hove-230-78 o[
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<-a Mr J G Keppler, Regional Director Office of Inspection and Enforcement US Nuclear Regulatory Cc= mission ReS on III i
799 Roosevelt Road
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Glen Ellyn, IL 60137 r
MIDLAITD NUCLEAR PIRIT -
UNIT NO 1, DOCKET NOM Q-R UNIT NO 2, DOCKUf NO 50-330 SEl'fLEMEITI 0F DIESEL GENERATOR FCUNDATIONS AND BUILDDG
Reference:
Letter, S H Howell to J G Keppler; Midland Nuclear Pla.nt; Unit No 1, Docket No 50-329; Unit No 2, Docket No 50-330; Setticment of Diesel Generator Foundations and Buildin6; Serial Hove-183-78; dated September 29, 1978 This letter, as was the referenced letter, is an interim 50 55(e) report on the settlement of the diesel generator foundations and building.
1 The enclosure provides the status of the actions being taken to resolve the problem. It is tentatively planned to hold a review meeting during the last two weeks in November. The Nuclear Regulatory Ccmmission vill be invited to participate when the time and place have been finalized.
Another report, either interim or final, vill be sent on or before December 29, 1978.
Enclosure:
MCAR //24, Settlement of the Diesel Generator Foundations and Building, Interim Report 82, dated November 3,1978 CC: Director, Office of Inspection & Enforcement Att: Mr John G Davis, Acting Director, USNRC (15) d irecter, Office of Management Infor ration and ProCren Control, USNRC (1) 78111782 lt h$
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,J Enclosure to Howa-230
- L Bechtel Associates Professional Cctporation
SUBJECT:
MCAR 424 (issued 9/7/78)
Settlement of the diesel generator foundations and building INTERIM rep 0RT # 2 DATE:
November 3, 1978 PROJECT:
Consumers Power Company Midland Plant Units 1 & 2 Bechtel Job 7220 Introduction This report is submitted to advise of the interim status of the project's actions relating to the settlement of the diesel generator foundations and building as described in MCAR #24 and NCR 1482.
General Background The fill material in this area was placed between 1975 and 1977.
Construc-
' tion was started on the di sel generator building in mid-1977.
The diesel generator building settlements were noticed to exceed anticipated values in July 1978. One concrete pour was made to finish _the structure to a common elevation of 662'-0" and to allow removal of formwork. A soil boring program was started on August 25, 1978.
Based on the preliminary.
soil boring data evaluation, MCAR #24 was issued.
The actions requested by MCAR #24 are being performed as follows:
1)
The Foundation Data Survey Program. Specification 7220-C-76, has been expanded by increasing the number of data locations and the frequency of measurements.
2)
.The cause of the settlement and the corrective actions required to preclude the recurrence of-this conditiou will be addressed after the testing and monitoring programs have been evaluated.
3)
The options availabic to resolve the existing settlement conditions will be discussed in subsequent reports following the complete evaluation of soil conditions.
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_,Bechtel Associates Professional Corporation Page 2 Description of Deficiency The general foundation and building settlenents as of October 31, 1978, and October 27, 1978, respectively, are shown in Figure 1 (attached).
Activities in Progress The activities are:
1)
The Foundation Data Survey Program as discussed in the previous report is being continued.
2)
The soil boring program has been completed.
There were 29 soil borings and 13 dutch cone penetrations made in the area of the diesel generator building to provide better definition of the fill conditions under the building and to obtain soil samples for laboratory tests.
3)
Laboratory tests for the soil sanples obtained from the borings are being performed by Goldberg-Zonino-Dunnicliff and Associates, Inc.
The tests are:
a.
Shear strength tests b.
Consolidation tests c.
Soil classification d.
Mineralogy tests All of the above tests are approximatelyl00% complete except the mineralogy tests, which have not been started. As the test results are availabic to Bechtel, they are forwarded to the consultants who have been retained. The tests are estimated to be completed by November 15, 1978.
4)
Independent Soils Consultants A team of consultants who specialize in soils has been retained to provide their independent evaluation and recommendations concerning the soil conditions existing under the diesel generator building.
The consultants, Dr. R.B.
Peck, previously with the University of Illinois, and Dr. A.J. llendron, presently with the University of Illinois, have visited the site and reviewed the existing conditions.
Based on Dr. Peck's consultation, the following resulted:
w.
-,w Bechtel Associates Professional Corporation MCAR #24 i
Page 3 t
Dr. R.D. Woods of the University of Michigan will provide an a.
interpretation of the dutch cone penetration tests.
b.
Mr. J. Dunniclif f (Goldberg-Zoino-Dunniclif f & Associates, Inc.), who specializes in soils instrumentation, reviewed the i
building and site to assist in developing a soil monitoring
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1 program.
5)
Related Activities I
Based on preliminary evaluation of the soil borings, soil test results, the consultants comments, and the construction schedule, several activities common to any corrective actions may be started i
before the next interim report.
Placement of the soil and underground utility instrumentation a.
i will be done.
b.
Separate the electrical duct banks penetrsting or otherwise restricting the equalized settlement.of the building from the footing to allow unrestricted settlements to occur. Grout any remaining separations between the building footings. Any 1
separations between building footing and supporting fill will be grouted.
t Raise the cooling pond water level from elevation 622'-0" to-c.
its design height of elevation 627'-0," which will bring the water tabic in the building area to its operation level.
d.
Visual monitoring and a survey of the diesel generator building i
and appropiate utilities under the building vill be performed before, during, and after Item b above.
i 6)
Other Areas Soils borings have been made in the other plant fill areas.
Soil samples from the borings have been sent to the laboratory for testing. The same group of tests will be performed for these l
samples as described in Item 3 above.
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, y, Bechtel Associates Professional Corporation Page 4 Potential Sa f ety It,plicat ions This iten is concidered reportable under 10 CFR 50.55 e, 1, iii because of the magnitude of the investigative tests and analysis of test results to support the corrective actions.
Submitted by:_
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Approved by: p 3 M
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Concurrence by:
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