ML19308A569

Interim Deficiency Rept Re Settlement of Diesel Generator Foundations & Bldg.Next Rept Will Be Submitted by 800222. Bechtel Ltr & Supporting Info encl.W/16 Oversize Drawings

ML19308A569
Person / Time
Site:	Midland
Issue date:	11/02/1979
From:	Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
References
HOWE-284-79, NUDOCS 7911070378
Download: ML19308A569 (33)

Text

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1 1 g Stephen H. Howell g Senior Vice President General Of fices: 1945 West Parnall Road, Jackson, Michigan 49201 . (517) 788-0453 November 2,1W9 Howe-284-79 Mr J G Keppler, Regional Director Office of Inspection and Enforcement US Nuclear Regulatory Co::raission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDIMID WCLEAR PLA!E -

UNIT UO 2, DOCI3T N0 50-329 UNIT KO 2, DocleT no 50-330 SEITLI2EI;T OF DIESEL GElGRATOR IVUNDATIOHS AND DUI1DIEC -

Pile 0485 16 SERIAL Ecwe-284-79

References:

S H Howell letter: to J G Keppler; Midland Nuclear Plant; Unit No 1, Docket no 50-329; Unit No 2, Docket No 50-330; Settlement of Diesel Generator Foundations and Building:

i a. Serial Hove-183-78; dated September 29, 1978

b. Serial Hove-230-78; dated november 7, 1978

c. Serial Hove-267-78; dated December 21, 1978

d. Serial Hove-1-79; dated January 5,1979

e. Serial Houe-58-79; dated February 23, 1979

~ f. Scrial Hove-132-79;-dstee April 3,1979

g. ' Serial Hove-174-79; dated June 25, 1979

h. Serin 1 Howa-218-79; dated August 10, 1979

1. Serial Hove-233-79; dated September 5,1979 l

This letter, as were the referenced letters, is an interim 50 55(e)

! report on the settlement of the dicac1 generator foundations and building.

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Enclosure 1 provides en update of the status of the actions previously discussed, the remedial work in progress or planned, and results of recent investigations.

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'2 Hove-284-79 Another interim report will be sent on or before February 22, 1980.

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Enclosure 1: Letter, Bechtel (JARutgers) to CPCo (GSKeeley), MCAR-24, Interim Report 8, BLC 8370, dated October 29, 1979 with Interim Report 8 dated October 19, 1979 as an attachment CC: Director, Office of Inspection & Enforcement Att: Mr Victor Stello, USNRC (15) l Director, Office of Management l Information and Progrcm Control, U3NRC (1) 1 Director of Euclear Reactor Pegulation Att: Mr Domenic Vassallo, Acting Director Division of Project Management, USHRC Washington, DC 20555 Mr Willicn Lovbeed US Corps of Engineers NCEED-T 477 Michigan Ave, 7th Floor Detroit, MI 48226 l

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Bechtel Power Corporation p  ? 777 EastEisenhowerha09xl j 7 li "( .g [/ i Ann Arbor, Michigan N MMAddsss: P.O. Box 1000, Ann Arbor, Michigan 48106 NOV 11979

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gud A55MN October 29, 1979 BLC-8370 Mr. G. S. Keeley Project Manager Consumers Power Company 1945 West Parnall Road Jackson, Michigan 49201 Midland Units 1 and 2 Consumers Power Company Bechtel Job 7220 MCAR 24 INTERIM REPORT 8 l

Files 2417/2801

Reference:

Letter (No. Howe-233-79, 9/5/79) from S. H. Howell (CPCo) to J. G. Keppler (NRC Region III Office)

Dear Mr. Keeley:

Transmitted for your information and use is the eighth interim report submitted for the settlement of the diesel generator foundations and building. The next interim report is scheduled for issue by February 8, 1980.

The current status of the four items (a, b, e and d) mentioned on Page 2 of the referenced letter is as follows:

a) Settlement Criteria for Bogated Water Storage Tanks and the Lines into the Auxiliary Building: The settlement criteria and settle-ment monitoring program for the borated water storage tanks and pipes are being developed. The monitoring program will be issued for use by the cnd of November 1979, with the settlement time rate criteria to be completed in February 1980.

b) Dewatering Design Basis to comply with the Intent of the Draft Standard Review Plan on Dewatering: .e draft of NRC Regulatory l

Cuide FN 811-4 on dewatering dated September 1979 is currently being reviewed to determine the impact on the dewatering system l design.

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BLC- 8370 Mr. G. S. Kscisy P gn 2 c) AQualityAssuranceplanforImplementingthePermahtN2td Dewatering System: The QA plan for implementing the permanent site dewatering system is still being developed.

d) Provisiont, made for the Train Bay Tracks Loading effect on Borated Water Lines: The borated water lines beneath the railroad tracks are encased by steel pipes. These steel encasements have been sized to carry the design train loads.

Vcry,,t,roly yours, hDY John A. Rt gers Project Manager i JAR /WGM/kb Attaclunent (35) cc w/Att.: cc w/o Att.:

R. C. Bauman (CPCo)

W. R. Bird (CPCo) L. II. Curtis -

J. L. Corley (CPCo) L. A. Dreisbach (Mid-Site)

B. W. Marguglio (CPCo) K. D. Bailey D. B. Miller (CPCo-Site) (4) L. E. Davis (Mid-Site)

W. L. Barclay (Mid-Site) W. G. Moring J. M. Amaral (Caithersburg)

J. E. Bashore (Los Angeles) .

P. K.11ansen S. I. IIeisler (SFPD)

R. IIermeston D. R. Johnson (SFPD)

J. Milandin E. A. Rumbaugh C. F. Smith .

R. K. Vassar P. A. Becnel (SFPD)

A. R. Betters /K. Davis (SFPD)

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Bechtel Associates Professional Corporation

SUBJECT:

MCAR 24'(issued 9/7/78)  !

Settlement of the Diesel Generator Foundations and Building (Insufficient Compaction in Plant Area Fill Related to ,

, Seismic Cate, gory I Structures and Facilities) ,

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INTERIM REPORT 8 DATE: October 19, 1979 PROJECT: Consumers Power Company Midland Plant Units 1 and 2 Bechtel Job 7220 Introduction This report describes the progress of remedial actions for the diesel generator building and foundations reportad in previous Interim Reports 1 through 7. It also summarizes additional soil investigations in the tank farm and general plant area fill. Updated profiling information for underground utilities and settlement readings for other Seismic Category I structures on fill are also included in this. report.

The remedial actions for portions of the auxiliary building, feedwater

, isolation valve pits, and service water structure will be addressed in subsequent reports.

Description of Deficiency ,

Diesel Generator Building and Foundation The deficiency in this area has been reported in Interim Reports 1 through 5.

Corrective Action Diesel Generator Building and Foundations As described in previous interim reports, primary consolidation of clay under the preload condition has been achieved. In addition, an adequate

! data base for prediction of long-term settlement is now available. The possibility of liquefaction in the diesel generator building area will be eliminated by implementing a permanent dewatering system.

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Bechtel Associates Professional Corporation MCAR 24 Ircerim Report 8 October 19, 1978 Page 2 Activities Related to Plant Fill and Settlement A. Diesel Generator Building and Foundations

1. Building Settlement Figures 43 and 47 through 56 have been updated to show the settlement data for the diesel generator building and borros anchors as of September 14, 1979. The revised settlement data show the rebound after removal of preload. Settlement measure-ments for the diesel generator pedestals were temporarily +

suspended during the removal of preload. -

The monitoring program for the building and pedestals has been updated. Prior to removal of preload, settlement measurements were being taken once a week to provide adequate data for prediction of long-term settlement. The required data have already been obtained; therefore, the diesel generator building and pedestals will be monitored once a month until January 1980 and thereafter they will be monitored in accordance with-the regular foundation data survey program described in FSAR Subsection 2.5.4.13.2. Selected borros anchors will also be monitored with the frequency stated above. Monitoring of surface plates was discontinued as of August 15, 1979.

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2. Preload Removal

Preload removal commenced on August 15, 1979, as reported in Interim Report 7, and was completed by August 31, 1979.

Optical survey measurement data, as shown in Figure 43, indicate.

the rebound due to removal of preload. Data from Sondex and deep borros anchors were recorded by Goldberg-Zoino-Dunnicliff

& Associates (GZD).

l During and after removal of the preload, rebound measurements I were taken to establish the modulus of elasticity of the l supporting soil media which will be incorporated in further

! dynamic analysis. The rebound measurement data are currently I being evaluated by GZD. Preliminary calculations based on the m

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Bechtel Associates Professional Corporation l

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MCAR 24 Interim Report 8 October 19, 1978 Page 3 present data indicate the elastic rebound is approximately ,

1/4 inch. In addition to the rebound measurements, cross-hole shear wave velocity measurements will be taken within the building to verify the dynamic soil parameters.

3. Building Construction Construction of the diesel generator building has been resumed.

A scheme for the leveling requirement for the diesel generator pedestals is being evaluated by the equipment vendor.

4. Gaps Under the Building Footings I l

The sizes of gaps beneath the footing of the diesel generator I building were remeasured after the removal of preload and compared with measurements taken immediately before preloading as described in Interim Report 3. The gaps were found to be unchanged (maximum: 3/4 inch). The preload has provided a full-scale testing of the building under a load exceeding its service load. The existance of a gap is not considered detrimental to the ability of the structure to carry design loads. Filling the gap with grout is being investigated to increase the safety margins already established by the preload.

B. Additional Soil Investigation

1. Tank Farm Area In accordance with the tank farm investigation presented in Interim Report 7, all unsuitable material has been removed and 4

the area has been backfilled to elevation 632 feet. Two plate load tests were performed by GZD in accordance with ASTM D 1195-64 (1977). Locations of the tests are shown in Figure 91.

Using a standard reference of 0.5 inch of settlement, analysis of the data for plate load tests 1 and 2 indicated 4.8 ksf and 7.0 ksf, respectively.

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1 Bechtel Associates Professional Corporation MCAR 24 Interim Report 8 October 19, 1978 Page 4 1

2. General Plant Area Reports on the test pits noted in Interim Report 7 have been completed. Results from test pits 2 and 3 were reported earlier in Interim Report 4. Test pits 2A, 3A, and 4A were made during a site visit by the NRC. The locations of these pits are shown in Figures 67 and 91. The material found in the test pits (LA, 2A, 3A, and 4A) was acceptable.

C. Underground Utilities

1. Pipe Profiling The undergound piping in the yard area was reprofiled in July 1979. The data followed the same general curvatures

, found as a result of initial profiling. There was little change in the absolute values (approximately 0.05 to 0.1 foot).

The underground piping in the diesel generator building area was also reprofiled in September 1979 after removal of preload.

The data are being. plotted.

2. Condensate Pipes i As reported in Interim Report 4, the two 20-inch and two 6-inch diameter nonsafety-related condensate lines were cut outside the turbine building wall during preload. These lines are being reconnected to allow completion of the condensate system.

Miscellaneous Updates of Tigures A. Figure 2-1 was updated September 17, 1979, to include the settlement readings of other structures.

B. Figure 5 has been updated to add feedwater isolation valve pits and label Class 1 structures.

C. Figures 11 and 12 have been updated to show the preloading of the transformer area.

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Bechtel Associates Professional Corporation MCAR 24 Interim Report 8 October 19, 1978 Page 5 D. Figure 90 has been revised to incorporate the proper scale of the feedwater isolation valve pits.

Ef fect on Project Schedule The remedial actions addressed in this report are not anticipated to cause a delay in the fuel loading or operation of either unit. Those actions which directly restrain the completion of system installations have been scheduled so that no delay in preoperational testing and startup activities is necessary. CPCo has stated that they will keep the NRC resident inspector in Midland advised of milestone schedules for major remedial actions.

Submittedby:b^ ^^

Reviewedh -

Approved by:

Concurrence by: ,

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DRAWING

SUMMARY

Figures Included in MCAR 24

. Submitted with ,

Figure Title Interim Report ,

1 Diesel Generator Building 1, 2 (Replaced by Settlement Data Figures 43 and 44) 1 Foundation Settlement Monitoring 3, 4, 5 2 Settlement Record Table 3,4,5 2-1 Settlement Record Table, Sheet 2 7, 8 3 Settlement Data 3 (Replaced by Figure 13) .

4 Settlement Data 3 (Replaced by Figure 14) 5 Seismic Category I Structures 3, 8 Sa Seismic Category II Structures 3 6 Diesel Generator Building 3 7 Bechtel Borings, Dutch Cone 3, 4 (Replaced by Penetrations, and Test Pit Locations Figure 67) in Main Plant Area (1978) 8 Diesel Generator Building Boring Plan 3, 4 9 Diesel Generator Building Underground Utilities Plan 3 l l

10 Diesel Generator Building i Underground Utilities Section 3 I 11 Diesel Generator Building Proposed Surcharge Requirements Plan and Sections 3,4,5,8 t

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12 Diesel Generator Building Proposed Surcharge Requirements Sections and Details 4,5,8 13 Diesel Generator Building Settlement Data 4,5,6 14 Diesel Generator Building Settlement Data, Sheet 1 4, 5 14-1 Diesel Generator Building Settlement Data, Sheet 2 5, 6 15 Diesel Generator Building 4 (Replaced by Settlement Data Time Rate -Figure 43) 16 Diesel Generator Pedestal 4 4 (Replaced by Settlement Data Time Rate Figure 44) 17 Instrument Location Plan 4 18 Diesel Generator Buildin; Crack Monitoring (3 sheets) 4 19 Designations and Locations of 4 (Replaced by Surveyed Pipelines, January 1979 Figure 60) 20 Tank Farm Boring Plan 4, 7 (Replaced by Figure 67) 21 Cross Section A-A Tank Farm 4 22 Cross Section B-B Tank Farm 4 23 Cross Section D-D Diesel Generator Building 4 24 Cross Section E-E Diesel Generator Building 4 25 Cross Section F-F Diesel Generator Building 4 26 Cross Section G-G Diesel Generator Building 4 27 Cross Section H-H Diesel Generator Building 4 28 Cross Section I-I Diesel Generator Building 4 29 Penetrometer Readings Test Pit 1 South Wall Diesel Generator Building 4 30 Penetrometer Readings Test Pit 3 North Wall Tank Farm Area 4 31 Penetrometer Readings East Wall of Test Pit 2 Condensate Water Tank Area, Sheet 1 of 2 4 32 Penetrometer Readings East Wall of Test Pit 2 Condensate Water Tank Area, Sheet 2 of 2 4 33 Field Density Test Results (3 sheets) 4 34 Plasticity Chart 4 35 Water Content Versus Elevation 4 36 Dry Unic Weight Versus Elevation 4 37 Total Unit Weight Versus Elevation 4 38 Shear Strength Versus Elevation 4 39 Shear Strength Versus Moisture Content Diesel Generator Building 4 40 Test Pit Boring Logs (3 sheets) 4 41 Diesel Generator Building Preload Plan 4 42 Diesel Generator Building Additional Boring Locations 5 .(Replaced by and Details Figure 67) 43 Diesel Generator Building Settlement Data - Building Markers 5,6,7,8 44 Diesel Generator Building Settlement Data - Pedestal Markers 5,6,7 45 Crack Mapping Diesel Generator Building 5 46 Diesel Generator Building Settlement Data, Borros Anchors and Surface Plates Area, and Cluster Plan 5, 7

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47 Diesel Generator Building Settlement Data, Borros Anchors and Surface Plates, Area A 5,7,8 48 Diesel Generator Building Settlement Data, Borros Anchors and Surface Plates, Area A 5, 7, 8 49 Diesel Generator Building Settlement Data, Borros Anchors and Surface Plates, Area B 5,7,8 50 Diesel Generator Building Settlement Data, Borros Anchors and Surface Plates, Areas B and C 5,7,8 51 Diesel Generator Building Settlement Data, Borros Anchors and Surface Plates, Area C 5,7,8 52 Diesel Generator Building Settlement Data, Borros Anchors and Surface Plates, Areas C and D 5,7,8 53 Diesel Generator Building Settlement

, Data, Borros Anchors and Surface Plates, Area D 5,7,8 54 Diesel Generator Building Settlement Data, Borros Anchors and Surface Places, Area E 5,7,8 55 Diesel Generator Building Settlement Data, Borros Anchors and Surface Plates 5,7,8 56 Diesel Generat:r Building Settlement Data, Borros Anchors and Surface Plates, Areas A, B, D, and South of Building 5,7,8 57 Diesel Generator Building Settlement Data Piezometers and Cooling Pond 5 58 Diesel Generator Building Settlement Data Piezometers - Sheet 1 5 59 Diesel Generator Building Settlement Data Piezometers - Sheet 2

-5 60 Diesel Generator Building Surveyed Pipelines Profiles by GZD 5 60-1 Diesel Generator Building Surveyed 7 Pipelines.Profilec by GZD - Sheet 2 61 Diesel Generator Building Plan of Pipe Profiling Locations 5 62 Crack Mapping Service Water Pump Structure 5 63 Auxiliary Building Plan 6 64 Auxiliary Euilding - Typical Section 6 65 Excavation Plan 6 66 Excavation Cross Section 6 67 Plant Area Boring Plan 6,7,8 68 Cross Section H-H s Auxiliary Building - North 6 69 Cross Section F-F Auxiliary Building - South 6 70 Feedwater Isolation Valve Pit Units 1 and 2 Temporary Support for Underpinning 6 71 Auxiliary Building Electrical Penetration Area (Looking West)

Finite Element Model 6 72 i Auxiliary Building Electrical Penetration Area (Looking South) l Finite Element Model 6 73 Auxiliary Building Unit 1 Electrical Penetration Area Temporary External Support -

Plans and Sections 6 74 Auxiliary Building and Feedwater Isolation Valve Pit Units 1 and 2 Dewatering Plans and Details 6 75 Auxiliary Building and Feedwater (Replaced by Isolation Valve Pit Units 1 and 2 Figures 89 and 90)

Excavation and Concrete Backfill -

Plans and Details 6 76- Auxiliary Building Walls, Crack Mapping, Sh 1 6

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77 Auxiliary Building Walls, Crack Mapping, Sh 2 6 78 Auxiliary Building Floors, Crack Mapping, Sh 1 6 79 Auxiliary Building Floors, Crack Mapping, Sh 7 6 80 Service Water Pump Structure Concrete Floor Plans 6 81 Service Water Pump Structure Typical Section 6 82 Cross Se.ction I-I Service Water Pump Structure 6 83 Service Water Pump Structure Structural Pile Locations and Details 6 84 Auxiliary Building Crack Mapping Railroad Bay Walls 7 85 Auxiliary Building Crack Mapping Control Tower Walls 7 86 Auxiliary Building Crack Mapping Control Tower and Railroad Bay 7 87 Borated Water Storage Tanks and Feedwater Isolation Valve Chambers Crack Mapping 7 88 Diesel Generator Building Location of Deep Borros Anchors and Sondex 7 89 Auxiliary Building and Feedwater Isolation Valve Chamber, Unit 1 Excavation, Underpinning, Backfilling Plan, Sections and Details 7 l

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! Isolation Valve Chamber, Unit 2 l 'Excavetion,, Underpinning,-Backfilling -

i Plan,: Sections and Details -7.,8 I

91 -- Tank Fara Investigation 7 e.

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