ML20104A578
| ML20104A578 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 02/28/1979 |
| From: | Gibbs M ISHAM, LINCOLN & BEALE |
| To: | Cowan F, Kornblith L, Smith I Atomic Safety and Licensing Board Panel |
| References | |
| NUDOCS 7903300546 | |
| Download: ML20104A578 (14) | |
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February 23, 1979 s
Ivan W. Smith, Esq.
Mr. Lester Kornblith, Jr.
Atomic Safety and Licensing Board Atomic: Safety and Licensing Board U.S. Nuclear Regulatory Commission U.S. Nuclear Regulatory Cor. mission Washington, D.C.
20555 Washington, D.C.
20555 Dr. Frederick P. Cowan
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Ret Consumers Power Company 3
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Gentlemen
' #'/ $ 3 Cd' Enclosed are two 550.55(e) reports, not included with the enclosures to my letter of February 19, 1979, which have been sub-mitted by Consumers Power Company to the Nuclear Regqalatory Commission.
Very truly yours,
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t Martha E. Gibbs MEG bc cc:
Service List w/ enclosures 7903300640, t
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Jcnuary 5,1979 Howe-1-79 D."A Hr J G Keppler, Regional Director
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office cf Inspection and Inforce:nent
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. T.9 U::IT I;01,1;CO*.'LT 1:0 50-329 14:1'l' 1:0 2, DCCri.T 1:0 50-330 51*.'.".2::T.:.T OF DII:S"L GE::".fJ,7C*t KUf:D*4"IC::S AIO I'JII.DIIto Hetere: cc: S H Mcvell letters to J G Keppler; l'idlend Ituelear Plant; Unit tio 1, Dochet ::o 50
- 29; Unit, !*o 2, Docket t;o 50-330; Settlecent of Diesel Generator Fcundatiens and Building; Serini Hove-lo3-78; dated September 29, 1978 a
b Serial Itove-230-78; dated I;cve ':er 7,1976 c
Serial Hove-267-78; dated D cember 21, 1978 Thir. letter, oc were the referenced lotters, is on ' interim 50 55(e) report on the settic. ent of the diose1 generator foundt.ticas and building.
Inclosure i provides the status of the actions being taken to resolve the rrnbIcm.
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Enclosuro 2 provides so.e typegraphical corrections and clarification to Dtain:ure 1.
Anothe.r report, either interin or finsi, vill be ser.t on or before February 23, l')V).
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Enclo:ure la itCAR Die, Settle ent of the Diesel Generator roundations and Buildinc, Interin Report ;,43, dated Deccaber 27, 1978
, : Erroto and Clarification for MCAR 2!, Interi:s Report 13 p
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CC: Director, Office of Inspection & Inforcer.cr.t Att Mr John 0 Davis, Acting Director, U3::r.C (15)
Director, offico of Muneceront J
7 Inforr.otion 481 I'rogrom control, UO:;f,C (1)
uau,1.n Bechtel Associates Professional. Corporation 777 East Ersenhower Parmway v
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SUBJECT:
1: CAR #24 (Issued 9/7/78) p Settic ene of the diesel generat acions and building INTERI.4 REpop.T A3,
. DATE:
_Decc=her 27, 1978 PROJECT:
Consu ers 76ver Corgany Midland Plant 1* nits 1 & 2 Sechtel Job 72:0 Increduction This report is subsitted to advise of the interis status of the project's actienc relating to the settle cat of the diesel generator foundations and building as described in 1: CAR #24 and NCR 1432.
Descriptien of Daficiency_
The general fcundation cad building scttic=ents (taken Decc=ber 6,1978) are shown in Figures 1 thecuch 4 (ictached).
Backtecund Infer-etion The Category I structures on the plant site are shown in Figure 5 (attac!.c!).
Figurc $A indicates tha plant structures which are Category II.
The plant fill was placed fres 1975 to 1977. Scienic cateCory I structures placed on the plant fill in:1ude the diesel generator building. the underground dicsci oil tanks, borated water storanc tanks and basin a portion of the service water punp structure, service water valve pits and the associated piping for each of the abeve systo:s. The arrani; n:nt of the diesel generator buildirc is shown in Figuro 6 (attached).
The settic: cat of Catecsry I structures observcd to dato ars as follows:
1)
Reactor buildings - varics f rom 1/4 to 5/8 inch 2)
Auxiliary building - approxi=ately 3/8 indi 3)
Service water pu:p structura - varios fraa 0 to 1/4 inch 4)
Service water valvo pics - approxf=stely 1/4 inch 5)
Borsted water storage tanks - approximately 1/4 inch 6)
Diesel generator building 3/4 inches maximun 7)
Diesel generator pedestal 1/4 inches tax 1=tus
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BCC: JLBacon, M-1C85A A ird, JSC-2163 RLCastleberry, Bechtel AA i
I TCCocke, Midl:nd JLCorley, Midlan.1 LADreisba:h, 2echtel4 idland DEMorn,tildland CAHunt, Pik-2093 GSI eeley, PIL LC63 W Koschik, M-69CA Marguglio, JSO-220A PAMortinct, Bechtel AA DRfiller, Midlcnd JFIavgen, Ecchtel-Midland MEZ!ibbs, II43 Tile: 0.L.9 20 i
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I MCAR #24 12. ERIM REPORT 3 T
Fage 2 that the structures on originsi soil shev no se::le=ent It is spparsa:
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These settlement values are censistent with the values in FSAR probica.
Tigurc 2.5-14A.
Soil Exploratien Af ter the excessive settictent of the diesel generator building was observed, subsurface studies were conducted in the.csin plant arca by Bechtel to prcvida inforestien to be used for de:cr ining any required There rc 29 borings, 14 du:ch cenc penetrati=ns, remedial ecasures.
- Soring, and 1 test pit which verc :sde in the dicsc1 generater building.
dutch cene penc:rstion, and the test pic loca:icns in the plan: area are shown in Figurc 7.
Fig *2rc 8 chovs the locations of those in the diesel generator building arcs.
Split spoon, Shelby tube, and Osterberg tubo sampics were taken frem the borings and sent to the Goldborg-Zoino-Denniclif f & Associa:cs laboratory 3sg sa:ples were taken f res the test pit. An undisturbed for testing.
In-sa=ple was taken frc= the pit in the diesc1 geners:or building.
vas esde in the test pit by Goldberg-Zoino-Dunnicliff place density tes:
b Associa:cs.
Laboratory tes:s =sde to date have been cencen:rsted on samples taken from the dicsol generator building arcs ' ith sete tests =sde in o:hcr areas of the pisne. Laboratory tests perforced include:
Soil classification tests (e.g., Atterberg li=its and gradstien a.
analyses)
Shear strength prcperty tests consisting of torvane strength, b.
unconfined compression strength, and uncensolidated und sined triaxisi strength :csts, along with unit scight and nois:ure content Tests esde to evaluste consolidstion preperties of the fill by c.
conducting one-dinensional :encolidation tcsts, specific gravity tests, and tests to evsluste the ef fcces of cscuration Minerslogy :csts esJe to evaluate the swelling potential of d.
the fill n::crisi including esti:n enchange C;pacity and x-ray difftsetion tests Co=psetion tests to evaluate the percent eenpaction of fill e.
materials Results from these tests are being evalusted.
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M:AR d24 INTERIM REPORT 3 Page 3 Corrective Action Tha' following altern'stive plans have been considered by project enginacr-ing:
1)
No corrective actisn required 2)
Modify the present strip foundations for the walls to a continuous sat foundation for the entire building.
3)
Preload and consolidate the soil under the building.
4)
Conbine Ite=s 2 and 3 above.
5)
Underpin the building to trans=it loads directly to the original soil layer.
6)
Recove abd replace the building and fill material.
Dr. R. Peck of Albuquerque, ::cw Mexico, and Dr. A. Hendron, Jr. of the t
U iversity of Illinois have been retained by ? +'*.cl as soil consultants.
n Associaccc has baan Mr. John Dunniclif f of Goldberg-Zoine-Dunnic retained as our instrunentation consultant.
Lt. k'ocds of the University of Michigan has been' retained to interpret the results of the dutch conc penetration data. These evaluations are under way and will be addressed-t in subsequent reports.
.Our soil censultants have indica'ted the fill is settling under'its own this weight. They advise us that there are caly two suitsbic optiens at I
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Rc=ove and replace the building and fill material 2)
Prclead and consolidate the soil' under the building Of these corrective action plans, Dr. Peck and Dr. Hendron have reconner.ded This ill prelo.-ding and censs11 dating the soil ur.dcr the building.
allow the settlencut of the building and underground utilitics to take place before plant operation.
Hodifiestion of the foundation and underpinning the building were dic=issad as possibic solutions because the residusi settlenent of the utilitics during the operation of the plant would not,be mint:1:c8.
1 f.
MCAR #24 IbERIMPIPORT3 Page 4 The preload option was selected because of the soil consultants' (Dr. Peck In order to and Dr. Hendron) reco==c.ndations for corrective action.construction of maximize the prcicad and minimize the schedule i= pact, the diesel generator building is being continued. '
The exact a:ount of prelcad and the consolidation duration are difficult to determine. To assist in the determina:1on of the necessary a=oun and duration of the preload, a systes of instruzentation is being placed to record the soil =ove=ent and the pore water pressure during preload.
The'instrumentatien consists of pic:e=c:crs, settic=en: pla: forts, and Borros anchers at sc1ce:ed locations and elevation's within and around the dicsc1 generator building. Control ins:ru:entation was installed in the'arca not affected by the preload. The additional sectic en: cannot be accurately predicted at this cice.
Activities Conoleted Since Previous'Re?6st The fo11 cuing activities were co=pleted since the last interim report dated Nove:ber 3, 1978:
1)
Isolating Due: banks The extent of the contact between the structure and the duct banks was c::plored. It was determined that the.uct banks were restraining the diesel generator building from settlinC independently. Hence, it was decided to free the building from the duct bank res: sin:.
The structure and utilitics were closely =enitored during the release of this restraint. No distress to da:c has been no:cd in the utilitics due to the sectic=cn:.
There were gaps in the order of 1-1/2 inch betvcen. the e.ud =st and the footings in the northeast arca of the building. These gaps were reduced to 3/4 inch or icss when the duct banks were isolated f rom the building. 7; erefore, there vill be no grout placed betecca the undcrcide of the footing and the cud =st prior to preload.
a mini =us of 2 inches of Ethafoa To ensure the frec :ov e=ent,
vill be placed around the duct bank and the excavated area filled with Ican concretc prior to preloading.
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i Bechtel Associates ProfessionalCorporation MCAR.f24 INTERIM REPORT 3 Page 5 2)
Meeting at Midisnd Jobsite A meeting was held on Decc=ber 4,1978, with the NRC, Consu=crs Power Co:pany, and Ecchtel representatives. 'The purpose of ths meeting was to infor the NRC of the curren: s:stus of the dicsci generator building settlement.
3)
Soil Ins:ru en:stion The installation of the instru entation described under " Corrective Accion" has been ec=ple:cd.
Activities in Proeres_s_
.The activitics in progress include the folleving:
The foundatica dses survey progras is outlined in FSAR Subsecticn 1)
This progrs= provides for survey dses to be gs:hsred 2.5.4.13.2.
The survey da:a at 60-day intervals un:11 the end of constru::1on.
-is gathered at 90-day in:crvals for the first year of opcration.
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At the end of this period, the survey asts vill be reviewed and an approprince survey interval progran devolcped, based on building perfor=snce.
This foundstion dats survey progrs= has' bcen expanded to provido additions 1 settic=ent points cnd sore shortened survey in:crvsis.
These The sc::1c cat pein:s have been increased fres 69 to 180.
fill.
additiensi points are for structures locs:cd en the pisnt The dets survey is presently being condue:cd en the structures at the following intervals:
a)
Diesel gencrstor building at 7 days fill at 14 days b)
Recaining structures on pl:n:
60 days - no change f rc= previous interval c)
Main structures a:
2)
Utility Monitoring There are utilitics passing nest and under the dicsc1 generator building as shown in Figures 9 and 10, some of which are Seicnic These utilitics are being evaluated based upon their Category I.
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HCAR #24 INTERIF. REPORT 3 Page 6 l
relationship to plant safety, plant operation, and geo etric sensi-The integrity of these utilitics will be tivity to settlement.
verified by monitoring representative lines. The conitoring vill include visus 1 cxs=instien for ds:sge and cove =ent, pressure tests, and centinuity tests as indicated in-Figure 11.
I The utilitics which have been selected for profile conitoring are a condensate line and a service water line. Sec Figure 11 for the location of the lines.
3)
Ebnitoring Cracks in the Diesel Generator Euilding L'all The existing cracks in the diesel generator building are being mapped to assist in the evaluation of the structure after preloading.
Socc of the cracks have clcsed af ter tdu: four duct banks were relcased. Strain gages will be placed at selected crach locations for =onitoring during preload.
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4)
NRC Inspection Report 50-339/78-12 The following items addressed in NRC Inspection Reports and 50-330/73-12 dated Nove=ber 14, 1978, are being investigated
.by project engineerin.
o FS'AR Tables 2.5-14. and 2.5-9 and 2.5-10 conflict with the fill caterisi description in Drawings C-109. Rev 2 and C-117 a.
Rev 6.
FSAR Table 2.5-21 and Subsection 2.5.4.5.3 conflict with b.'
Specification C-210 and Quality Control Instructions C-102 regarding required nu=ber of passes for conpsetien.
F,SAR Subscetion 3.8.5.5 - T.xpected settlement c.
Conflict betvecn ISAR Figure' 2.5-47 and projec't Drawing C-1001, d.
. Rev 5 'regarding foundstien elevatien.
Conflict in Specification C210 regarding co=psetive effort and a.
test acthod
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Bechtel Associates Professional Corporation-MCAR #241hIERLM ?.EPORT 3 Page 7 Conflict between censultants' reco ::endation and Specifiestion-f.
C-210 regarding lift thickness and conpaction requirements tolerance in =oisture content per=1tted in Specifica icn 12::
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C-210 and whech:r the =aterial that was placed reisted to the selected proctor h.
Cracks in the diesel generator building structure i.
NRC Questien 362.2, subsection 2.5.4.5.1 5)
Direct Effect of surcharge The dircet effect of the surcharge is being investigsted as informa-tien becomes available. This will be sdd:cesed in detail in subsc-quent re;cres.
Futurc !.ctivities The activities planned for the future include the following:
1)
Surcharge Operation The consultants, Dr. P. 3. Peck and Dr. A.J. Hendron, have recc== ended the preloading of the diesel generator building ares to consolidste the underlyin; sterial. It is estinated that between 15 and 20 feet vill be utili:cd. The prcload ber= will extend 20 fee * *
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fro = the exterior of the butiding as sho.: in the referenecd Fi;ure 11 (attsched). The preloed bcr= betucen the diesel generator and turbine buildings vill be detsiled in future reports.
The follo ing prepar:tions are being =ade to prepare for the preload:
2) a)
Tree:c protection in the for= of about 2 to 3 feet of sand is being placed on the present gr:dc in the areas to be surcharged.
Because of the close proximity of the dicsc1 generator and the b) turbine buildings, additional details are being developed to stren; then the turbine building vall for the surcharge load in this area.
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HCAR #21 INhERIMREPORT3 Page 8 c)
The elevation of the water tabic is i:portant in ensuring opti=um use of the preload. The vat'er tabic in the arcs of the diesel generator building is influenced by the water elevation of the cooling pond. The cooli=g pond vill be filled concurrently with the placing of the curchargo. The soil consultants have concurred to start filling the cooling pond as soon as possible.
3) g lysis of Structures Analyscs vill be perfor=ed as required to evalusta the effects on the structures.
Schedule Impset The i= pact of the diesel generecor building settlement probles on the schedule vill be discussed in subsequent reports.
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Rciteved by Approved byto Yb:M d d
>A Concurrence by:
BECUTIL /.SSOCIATES PROFySSIO::AL CORFO?'. Ir:-
RB/js 12/11/13 o
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EP9.ATA A!.D CIAFIFICA'"IC** MR M?lR 2k, EM Mr A3
- Page 2, Line 3:
JSAR Figure 2 5-lhA chould rend raat cable 2 5-lhA
- Page 6, Paragraph L) b.:
C-102 should read C-1.02
- Figure 8:
Boring labeled D shcaid not be en this FiCure.
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Reference:
Letter, S H Hevell to J G eppier; '!!dland *:ueles Plant; Unit **
1, *::ch:t
'~o 50-329; Uni:. :o 2, :::ket
~~s 50-33";
Class 1E Stat ~en htter ; Eeve-235-73; dated 0 va-%- '7, l??3
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ne referenced letter was an interi. 50.55f e) repo-t.
- his letter is also an interis report.
Descrirt'en of iter'erane.-
In accordance vith the requirc:ents cf Title 10 of the Ced of Federal Regulations, Part 21 (10 C R 21), Exi:le, the veni:r" for the subje:t equ';-
ment, adviced the :*?:* t!.s: as a result of sei::1: sns ysis perfer ed en the
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Class lE batter / rs:ks, an siditien21 is:12tien bar nu:t te adfd at tve-ell incre.ents in crier to =iticate the buildu; of hori: ental n:.en.u. duri 2
seis=ic event. Exide has stated tha. their sna*.ysis vas nade of a hori::r.:21 seismie loading of the =a.rnitudes to be anticipa,ed.
Consider'n:: the =s : er the "G ecil, their ena3ysis choved that the loading V :Id be tran: nit *ed thrcuch the in. cree 11 connectors devn the rev of cells with the con: trained end cell sutje:ted to thi: total. nent. ' his loadin;: could etuse the end ecl1 to cuffer da-c.
Safetr T-elient'-me Exide fiarther stated that the failure =ede, if this deficiency was not dete:td, would be to the end cell in that tt.e ter=inal post. and ecver could not ::an1
[;j A circu:t the forces and veuld fail with a probable di runtion to the circuit.
in-disruption vould te cla:sified as a failure of the battery to perform it
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1 tendt.d safety it.netien.
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t we-3-79 Corrective Aetien The corrective 2:tien hs: been initiated by T.xide to add isolation bars to the racks after insta11ntion.
~he 1:01stien tar is currently being desirned by Exide. Drsvincs sheving this chance vere re:cived Ee: enter 1:.,1973, and are current 1*/ underg:ing enrineering reviev.
~he assentlies nre to be avatistle for retrofit i veeks after drnving s;;r:vs1. It was originally reported by Exide that the isolatien tars vould te available by Decenter 10, 1973.
Rerortability Based en the anticipated failure ::de, Exide felt that this.*as a potential protien with yessitie saf:ty 'in;11:stien and therefore was con:idered to be reportatie under 10 CFR 21.
Actual seismic testing by Exide cf their prototr;e G cell and tattery rack assenbly is scheduled to te cenpleted in ku;nst 197.3 vith the re;:r'. antici-0
. pated to te re:cived by Septe-ter 197..
Another report, either interi cr fin:1, vill te cup-lied by Janunrf 21, 1970
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Director of Cffice of inspectie f Enfor:enent Att: !ir. John G. Esvis, A::,ing *:irector,1*S:~2.0 (15)
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