ML20214G857
| ML20214G857 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 09/13/1972 |
| From: | US ATOMIC ENERGY COMMISSION (AEC) |
| To: | |
| Shared Package | |
| ML20214G855 | List: |
| References | |
| CON-WNP-0098, CON-WNP-98 NUDOCS 8605220565 | |
| Download: ML20214G857 (6) | |
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- y SEP 13 1972 anticlinical hills. There f ea t u rc:.. rcpres"nt outliers within the basin of the 15tanum Ridge which plun;y s tcncath the glacio-fluvial soils at the ecst side of the Basin. The turied extension of this structure lies about 2 miles east of the site in a subdued form.
The ridges that are present in the Pacco Easin area are long, sinuous, asymmetrical anticlines that are generally oriented in a northwest-southeasterJy direction, hetveen the anticlincs lie the Cold Creek, kahluke, and the Pasco Synclines. These folds were for:ed as a result of regional uarpitg. Several of the anti-clines, such as Untanum Ridge-Gable !buntain and Sa/dle Mountain, are faulted. The faults, where identifiable, are high angle thrust or norr.a1 faults of linited extent that occurred when folding ucs inadequate to relieve the regional nctcsses.
The Pasco Basin is distinct from coat of the Colut.bia River Plateau, the forraation of vhich begcn by voiceaic activity in early Miocene, in that it has undergcne continuous subsidence relative to the Plateau at 1 cast since the Miocene. lue bcsalt flous teneath the basin have attc*ned c thickness of at levet 5,000 feet. In Inte Miocene or Pliocene, in additior, to the continuing subsidence of the bcsin, the region of which the P.'sce bnain is a part tecas:
subjectc.d te folding, thus forring the coticlines and synclir.cs descrited above. Igneour activity (cased in early Pliocene. The cubniding cf the Lasin and the rerf enil warping are believed to be contiruing to the prorent ti u The subsidence of, end the folding arour.d, the Ens n have ercated the setting for a natural re; cr /cir, t.n ' the arca han beca subjected to citernate periods of fleedin;, cnd eronf on. It cas this envircr-rent that allottd for the deposition of the approxitctely 500 feet of t u!) conpricin: the ginclo-fluvicI deposits and the hint:1d Forcatica tha overlie basclt beacath thc site. The Rinralc rarna-tien vaa de;.oritc! directly en beacit durInd aa entendcd period of floodin;, frer Pliccene to e crly f1(!s tocene. In the Plei:tecent, a2 c result of the reiting of .elaciers to the north, the l'asco Basin uc. cutj:ct;d tc thcrt, int:rsittcat interval: cf f1 ceding and cresion. During periods of floodir.g. the glacio-fluvial sof1s everlyint the kli. gold Forca!Icn were for.ed.
SEISPALOGY
,The historic seisnicity record of the region is linited to only abcut 100 years. The two historically recorded uacroesrthquakes of greate.t
t gao7' tigrJ.fiett e e - . cite cre 1:.t 191: , m u etr'.hquW. Wit h a Modi fie ! S r ' "; i t c r.21t 'e 'l' vi th e 19% Milit,r.-Freewater
'Jc12 a Uc 1} r ec - .a. er. If' i nt51 c. III. The etrft ecrthq:che t.ny he m- 1". :.::c i- d . "
- h 0 - Et%1e :.::vnttin structure, tr.d the Milton-Fa w.:sur carthqud.e hst beer httributcd to the P.attl<.-
cnakc-Uullula r r x.t.!c. Since 1957 the UC';0 has been eenitorf rc tierott.rd T d.he r lt .h<. Hanferd Ecrier,. Severel patterr.s cf epi-cer:ttrs have 'c r<.n e t.tabli she d. The to::t sic ;ificant to the l'ar ferj 2 rite is an eact-wert oriented, ellipticcl nerar.cerent of micro-chrthqs.ch epi .cnter; chat 3 , ti]e: scatheas' of thc site, r: car Uccicd !citr.l. Tho tier c+cr .hqbahes et Weaded Island have t ecn et .:!! ; .5.3
.o zu ecutinuins Lacin'nc c f the Pasco Easin. -
In co,.t Mc i st i on c f t' . infomaticn st:.r.;arinel above, the applient?.
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c'es':~ terire: tC ee ;cMration value of 0.25 ?
rer th' Enfc f t.t.t onwn Farthqt ths . Thic '.nlite is based en the asezption c r e. '.'i l . n- : - c m r .m.e ect r.ushe c: the httlect:ake 'lalltle rtr'tt :- at ir elcret opprc:.d to the citc (11 mil *:t wect).
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Tr.c rc . a: . t-:diticcal cente2 r. that thir ntructure r.ight be the ce nert. t ur c f t: <- h i c 'c:. ri e leli: u carthquahe: .o the vert and 9<
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- 9 r;t':t c 't f ~ n'.cr clutter at 'doedcd Icland. /.n extensive invcetiettice cf thc cry wat t r/!ert ake n. Follo.rinC thcir revice
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ste 13 B72 of the results of this investigation end in their input to the FFTF farety Evaluation the U333 concluded that: "the preponderence of ava!]able evidence suggesta that the Yakirca Ridce anticlire or accociated structures do not poscess those character 1ctics which
,:culd suggect a rotentinl an a major reictic cencrating structure, c1though such a potential cannot be totally diccounted on the basic of the evidence at hund." Tne ctaff ecncurred with thic conclurion.
In addition to our concerns regarding the Yakita Ridge Anticline there was alco the concern that the exictence of the cutcurface continuation of the Gt.ble I:auntain anticline cast of the cite could reprocent a major earlht erke cencrntor. Inced on ceophysical investigationc and on ctudice of existing well 3 cgs, the cubsurface centinuation of thic cir;cture is cutdued esct of the cite, end available evidence in.licates tha+. it: e.htracter is such that it can le concidered of lecs r : cuificance cc an earthqueke generator tPan the Rcttleenske Un)) ala r.tructure. The apnlicant'c concu.ltsnt det m.inea tec 71cticachip of the reoJ c;ic ctrecture benerS the site to tLa rer!onal c2clogie S truc t u re b;, corrc2cting the tedrock litto]occ tenetth the citc with irnt cf the curro;nding eren. Tne attitu.ic.' of teddin:. , cit. :r. The teralt i enenth the cite confor.t ' 2 ry
.7c11 with re cie:al attitticc. Altheudt it is net in itcelf conclut ive, detc iled rtucy of the ' ".tcr'a? c expoccd in the trench cut acroac tha reactor site rcycaJed no a;3;15.cetent cf the nea r eurface . soils.
She nppli cc r,t has ec - ' t' . ' t o geolo ' n21; lo (r..; ir d : a f l all exct vctione and pipeJ :. s fer Cetegorf I ctructures. The ctaff and our UG conrultsntt I I: n to exa:.Mne theca excavations snen the,. are orcnad u;.
Nring the FFII' ctfc t;' revicv, cur 50AA consultant stated that "Ar a recult of thir revie m: W ce'cnoJc;icrl cnd Ecological ch.rceteristicc cf the tret tro.md 11- rro,*rded c!te, t e Fcis~oJo;icel invect':,stionc
'"cu,believec LLet tn actie re t ion of 0.13 ~ is e.dc qutte for rcpre sent: c ee rth qur ke di rturi enx - l '_51y in c . c - :r '.trin t?e lifet >c of thic facility. Also, the ' ro .t a greer rith the applica-t thet nn eccelars tir-of 0.25; ic odequnt: for reprecenting the ground r.otion from the razitu .
ecrthqu;ke likels to affect the cite. It ic tel:cred that there valuur voald be adequate for es >.ir.g protection acninct the locc of function of co panents important to tafety." *ie have not received a report from our U0AA consultcut.
fac,ed on the above n.entioned ens]ysec, yet still dependent en a final conclucion from the U233 and I!OAA regarding this cite, it is our opinica that the applicsnt's proposed carthquake design baces represent edequate30 concerictive va2ues.
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c.,p ' 3 1972
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_ __ SITE Ifr/ESTICATION The original cite loca t,1cn ric h30 feet north of the precent location.
Eleven toring vore crilled st the original cite, the deepest of which vac 250 feet. Nineteen additional boringc have been drnled at the precenti:/ propered cite lo:: tion. One of the borings extended stout 127 feet into basalt bedrock.
Four celc ale -refraction linec were run at various angles across the site to determine dynamic properties of the coil and to locate the top of buctIt bedrech. Uthole tects were perforred in two of the borincs.
Piezo. meters ve:e ertalliched in reveral cf the holer to ronitor croind-wat.:*r fluctuat i on . 7.;; fcIlowing la'.. orator / and (or) field terts were r.cdc or celected carples: vnter conter.t, grain cize, rsx/~.in and relative dencitier, reconant colt n, repetitive triaxial at different ctrain leve]c, and co ptetion.
A trench, fiftaen ren dcep, w excLvated alcanally acrcca the r(tetor site. Tr.e vallt verc r.or;id 0 ologietl2; Ena ir titu relat:ye dencity tectc and pl.nt bearing testr were cce et de;.th: ef 10 and ]5 fect.
FOUI.Tf T10ii ETi'aIIO
'"':0 rdte cree in tier'eted ti f rt .- 1-1/ 2 to 3 fec- cf indblevn rand.
Unco:.rolidated ;;1acio-flw:nl enn.ir lie benaath the aeolian depositr and extcal to cn avenga d:pth of E.to.:t 43 feet, leneuth the glacio-fluvici scil nnd extendir7 to bedrock surface et 5; depth of stout 525 feet lis the zernrelir .in to ser i-centolicated r ar.de , gravelc ,
silts end clejc of tne Rincola For .ation. Groundwater ter.eath the site at th ta . of 1 5 er;1 orations was ct un elevatica of +37E (62 fcot depth). Initfel etchti ?tiatt indicat2d that th' 2752:' DC fc0t of clecic-firal cci2 var very dance, however, the supplement 91 irciertict-tions, .tich incluG: tutin oof in-ci.c roilt v10.in the trench, revca22d that thcce coi]c r .g2d fro todtrately dense to very 2 core.
Inctead of fournug the Category 1 ctructures and ripelines vithin there r.ateriale, at hed prcviously been planned, the applierat now plans to cxcavcte doun to the Ringold Formation at about 40 feet aepth and techfill with granular soil conpacted by vibratori compacting equipment to a .initr. of 7% relative density cnd an averate of 95%
reintive denritj ne deter:rined by AST'! D204 9 -69 (vitratorj lab compactive techn!que), up to previoucly determined foundation levels. It is our underctanding based on Table 3 of the Shannon Wilson Report and corrents within the re; ort, that additional criteria vill be ths.t the vibr.torj co.~ncted tuc': fill 111 rat:r C a minit r requirc ar.t of 105I e
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SEP 1 U 672 AASHO caximum dry density. A tect fil3 vill be constructed prior to tackfilling to confirg soil compaction characteristics. Settle-nento are expected to te mininal. and occur durin; construction. Both rebound and retilement tonu ents vill te inetalled and monitored during excavetion and construction. Lateral pressures for structures at proposed d-pthe have Fren cvaluated under static and d;rnamic conditions. The nn. ural soils below a depth of about 40 feet and the backfill compacted to the exttnt deceribed above ere not telieved to be susceptible to liquefaction, based on lab tests and historic experience with nimilar soils. ,It is our opinion that the investigations of the site cre ndequnte and thst the parameters derived from these investigations contain c0 equate carg'r s of safety, a
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