ML20107A933

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Recommends Proposed Course of Action for Responsibilities to Be Shared W/Nrr & IE Re Settlement of Diesel Generator Building Foundations.Ie Will Provide Assistance When Necessary
ML20107A933
Person / Time
Site: 05000000, Midland
Issue date: 11/17/1978
From: Reinmuth G
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To: Vassallo D
Office of Nuclear Reactor Regulation
Shared Package
ML20099A237 List:
References
FOIA-84-96 IE:RCI:78-05, IE:RCI:78-5, NUDOCS 8502200153
Download: ML20107A933 (5)
v • d • e


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78-05 i

TRANSFER OF LEAD RESPONSIBILITY Y.

TO:

D. B. Vassallo, Assistaat Director for Light Water Reactors,

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Division of Project Management, NRR -

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SUBJECT:

SETTLEMENT OF DIESEL GENERATOR BUILDING FOUNDATIONS AT

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t MIDLAND PLANT, UNITS 1 AND 2..

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RESPONSIBLE ASSISTANT DIRECTOR:

G. W. Reinmuth I-s DESCRIPTION OF ITEM REOUIRING RESOLUTIO'N:

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. As a result of a recent inspection during the peried of October 24-i 27, 1978 at which time Region III inspectors examined details related to reported settlement, it has become apparent that the magnitude of differential settlement observed by the licensee may be significant.

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l Infomation related to the subject of settlement of the diesel generator j

building foundations was first reported to Region III on September 7 i

1978 as a 10 CFR 50 55(e) item.

On September 29, 1978 an interim l'

report was submitted. The inspection followed this item the next

[

month.

.s The FSAR in Table 2.5-14 specifies " controlled ccmpacted cohesive

,j soil" be used as the supporting soils for the Diesel Generator Building, portions of the Auxiliary Building, Borated Water Storage Tank foundation, Diesel Fuel Oil Tank' foundation, Radwaste Building P

and other structures. However, the supporting soil actually*used for these structures was random fill material (Zone 2), which is l'

defined as any material free of humus, organic or other deletarious i

material (Table 2.5-10). The material included sand, silts, clay and -lean concrete.

The applicable specifications, procedures and drawings contained j

conflicting requirements, were at variance with FSAR requirements l

and/or did not implement recommendations of the architect-engineer's consultant in such areas as: percent compaction requirements, I.

lift. thickness, required number of 1.;

and type,of fill material.. u... passes with specified equipment

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D. B. Yassallo 2

NOV 171373 The Itcensee's architect-engineer ensaged the servicts of an additic.,a1 consultant in the geotechnical engineering area to perfor= laboratory tests on soil sampies obtained during a soil boring pr,ogra:: which began on August 25, 1978.

The final results of the investigative soils test program and the recom. ended alternatives and actions concerning the resolution of -

this problem were scheduled to be presented to the licensee during the week of November 6.1978.

While other structures mentioned previously are being monitored and are experiencing settlement, the licensee has characterized these settlements to be not as severe as that of the diesel generator Building.

RECOW.ENDATIONS'AND PROPOSED COURSE OF ACTION:

s 1.

NRR will evaluate the situation ' based on' current facts to datar -

mine whether additional information is needed to assess the ~

acceptability of the plan the licensee intends to execute.

2.

NRR will determine the accep,tability of the proposed corrective action, if any and advise IE.

' 3.

IE will provide assistance as necessary and will assure compliance with any new or revised requirements.

CONCURRENCE:

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MAh Mk7b1

[mTal W.7einmuth, psistant Director.

'Date

. Division of Resctor, Construction Inspection. IE

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O M.

F

. Yassallo, Assistant Director

~~~1 */7-77 Dete for L,fght Water Reactors. DPM. 'NRR,

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Enclosure:

1.

Initial QA Report on Deficiency

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Interim Report dtd 9/22/78 pl 3.

Transnittal ltr, Howell.to r

Keppler, dtd 9/29/78 f

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~ ' R. S. Boyd, NRR.

f R. J. Mattson, NRR k.

S. A. Varga, NRR' Y[p.

D. S.' Hood, NRR-b J. G. Davis. IE C

N. C. Moseley IE f.-

H. D. Thornburg, IE

!Ic B. H. Grier, RI N

J. P. O'Reilly, RII

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J. G. Keppler, RIII Aj!j.

K. V. Seyfrit RIV R. H. Engelken, RV R. E. He.ishman, RIII -

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  • Dater Nov 171573
  • Serfal'No.: IE:RCI: 78-c5 TRAM 5FER OF LEAD Resp 0NSIBILITY D. 5. Vassallo. Assistant Director for Light Watar Riactars.

TO:

Division of Project Management. NRR

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SETTLEMENT OF DIESEL GDGATOR BUILDING FOUNDATICNS AT SUSJECT:

MIDLAND PLANT. UNITS 1 AND 2 RESPON513LE ASSISTANT DIRECTOR:G. W. Refreuth DESCRIPTION OF ITEM REQUIRING RESCLUTION_:

As a result of a recent inspection during the period of October 24-4 at which time Region III inspectors axamined dotatis rotated

27. 1978 to reported sett1 ment, it has become apparent that the angnitude of differential settlement observed by the licar.see may be significant.

Information' related to the subject of settlement of the diesel generatar building foundations was first reported to Region III on Septeener 7 On September 29,1978 an interim b

1978 as a 10 CFR 50.55(e) itam.The inspection followed this item the next report was suba:itted.

month.

The FSAR in Table 2.h-14 specifies " controlled compacted c=hesive I

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soil" be used as the supporting soils for the Diesel Generator Building portions of the Auxiliary Building. Sorated Watar However, the supporting soil actually used r.

and other structums.

for these structures was randon fili ' material (Zone 2). which is defined as any material free of humus, organic or other deleterious l

The saterial included sand, silts city material (Table 2.5-10).

and lean concrete.

The applicable specifications, procedures and drawings contained

- conflicting requirements, were at variance with F3AR re percent compaction requirements.

consultant in such areas as:

lift thickness, required nebar of passes with specified equipment l

and type of fill material.

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CONTACT:

R. E. Shawnaker. RCI 4g-27551 k

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D. f. Yassallo 2

NOV 171973 i

The licensee's architect-engineer engaged the servicas of an additional consultant in the geotechnical engineering area to perfors laborstory tests on sof t samples obtained during a soil boring program which began on August 25,1978.

The final results of the investigative satis test program and the recommended af ternatives and actions concerning the resolution of this problem were scheduled to be presented to the licensee curing the week of November 6.1973.

Idhile other structures mentioned previously are being monitored and are experiencing settlement, the licensee has charactarized these settlements to be not as severs as that of the diesel generator Building.

AEC0 MEN 0ATIONS AND PROPOSED COURSE OF AC7 TON:

1.

MAR wili evaluate the situation based on current facts to datar -

eine whether additional infonnation is needed to as:ess the acceptability of the plan the licensee intends to executa.

2.

NRR will datarmine the acceptability of the proposed corrective

action, if any and advise IE.

3.

IE will provide assistance as n i' -

with any new or revised requirem.acessary and will assure compliance ents.

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l CONCURRENCI:

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d ik7h*

at W.7einmuta, 46sistant Director

'Date Division of Re&ctor C6nstruction Inspection. IE 1

0 Ad 1/-/f*7/

D. B. Yassallo. Assistant Director Gate for Light Water Reactors. OPM, NRR i

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