ML20210S577

Trip Rept of 780309 Site Visit to Inspect Faults Uncovered in Unit 3 Excavation Site.Site Originally Inspected for Faults on 771026.Description of Inspected Areas Provided. Further Mapping of Trenches Forthcoming.W/O Stated Encls

ML20210S577
Person / Time
Site:	Satsop
Issue date:	03/16/1978
From:	Rolonda Jackson Office of Nuclear Reactor Regulation
To:	Gammill W Office of Nuclear Reactor Regulation
References
CON-WNP-1573 NUDOCS 8605290302
Download: ML20210S577 (5)

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.- 5< 30BJECT:,. SITE VISIT 1D INSFECT FAULTING AT UNF 365 l , , .. ,. .

l ', .: DOCEIT EMIEEt STN 50-508 and 50-509 '

l 7: FACILITft WFFSS Neelest Projects No. 3 and No. 5 ,

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' Oc.ien'esember 13 1977, *=himyton Felia Power Supply System (applicant)

! . p Andesund the staff by telephone that several faults were uncovered l  ; O lin'the enemvation of Dmit No. 3. As a result of this call a site S

- ' 3 l visit uns made en October 26,1977. ~ As a result of that sita visit

! T. j-, a tentative ma==1==4am that'the observed faults were not capable was J renahed but the staff required further formal doe ==,ntation. In l

1. f. addition, of the strustaral further information relationshipwas of the required site faults ta the to form thoseofinathe disenssionnear l

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region. Several reports were siebuitted and reviewed by the staff geologists. On January 20, 1978, Enrold I. Lefevre issued an affidavit" '

NN . discussias'the staff's review of the information gathered to date. Im'

! , i, M that affidavit he indiented that, "Iha staff will require sufficient o;.Iv*====*43=**- of these sus 11 fanits (Belm Creek Terrace Faults) to l ,

! ., P t domnestrate ubether they are of landslide arisia or investisatione l,,my dk,suffinimmt

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[ [ den Pehrmary 28,1978,'~wa received a report free the applicant entitled, i , l' 4.N "Results of 1. aman 14da Studies and ongoing Investigations of Faults I * 'N at the IMF-3 and IMF-5 Site" wktah provided the results of the con-l .

-firmatory investigation requested by the staff. This report comeludes

, that the offsets in the Bela Creek Terraes omits are related to land-l' ' , J slide features and that the fanits at' the site eres are not capable.

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this latest site visit was made to field check the information providad i

- s 'in this report ==d view mer information acquired since the above report

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on March 9,1978, I visited the WPSS 3 and 5 site and site area, with 1 I

visits to specific study areas designated as: Helm Creek 1. Holm j

5' " Creek 2, Furgatory 3,~ isilroad fault. plant island and laiP-5 area.

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• i r W'frAssumined'astural esposures or manavated trenahes.A'liet In addition,' I of, attendees .!

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4. was provided.with new treach and excavaties logging and aerial photo- ,

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l t;$g1A Pu=1M=W.ph,"R'M6Mf.W- y complete serias tes F.s.1, h 7 :Ilb i-% N[X4 ' _ 2 -

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10. 1 set air photos (4) site area taken 2/27/77 '

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11. 1 set air photos (2) site area taken 1/19/76 ,

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...- As overview from the DNp-5 area of the Reim Creek area along with a .;

fi J view of the airphotos reveals a definite landalide type arenate topo-  !

l g ',y jp @ graphis backseary feature. In the trensh which has been eut meress 5 i l .

,; h:,, ;this topographie feature ~(Bala Creek 1. Trench 781-T2) one een observe l %, y'.yp ':sermal faulting, which .displeses a westbered soil horises, reverse r  : . tdips in rotated blocks in the dowathrown block, continuous Beim Creek 21

. atratigraphy. in the ine place bleek, and the eroded headecarp of a land-l-

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c. c slide. h loestion of boring FS1-51 is within the landslide block to j the east of trench 751-T2 and ladisated that there is no ahearing below I .

.syproziantely 40 feet. Downhill from both the trench and the boring

~is the incised Fuller Creek drainage. The Helm Creek deposits in the j -

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l F32-T2 tranch area consista of a : red to brown mixture of silty and sandy elay units interbedded within sandy units. Some crossbedding .;-

l  %, . 4 is present as well as loses deposits. Indicating that an active finvial . .

W w idsposition and erosion environment probably occurred at this locael.on ..

- Q N during $1==4=1 malting. Treach Fal-n is an exposure of a compler

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l. ' Epsoquence of normal faults offsetting Malm Creek units. All of the .&, .. g t

[ M.' f W 9;effeeta indiente normal displacemmat in the downslope direction. The g , H'.

l4}, ' Mksilt ' nd slay esteal"sbest sones either have 'an sheemse of shear material or contain - . TM - S

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a with some utmor~ amounts of breesisted eeustry material. -

' Y:' w as fa=1== ions. Observed offset were on' the order of several ineham

. MIand the meet pr-'-4===t offset une not enesurable in this exposure.

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f,; 1 The location' of this feature relative to the observed topographie ST M l ' ' ,M #;

• 9heademary wedd indicate that it. is 's alug saatmined within a larger ,"t l

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. In this area, I' enemined trench FS2-T1 which revealed evidence of

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l extensive depositional eross-bedding crossent by a chamami fill deposit. n ;

. Several small fadts dipping to the east offset the erossbedding and 3 .

s:- ' "iindicated normal displacement with the downthrown block on the sida ie M[

i l W W .mearest.the ebenmal #111. These offsets are aroescut by the *hanna1 7 m C' i and sees.:,: dieo ',ut in lower stratigraphie units in the treneh area. " 'NI j 7 .' . . .,

' # Ia' tremek F32-T2. which is subparallel to FS2-T1, no effset in the -i

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well-esposed bedded v2its were observed along the entire length, although l the sentral section was not visible due to the presence of ponded water.

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?! Trench FS2-T3 parallais both FW2-T1 and T2 shows a channel fill which 1 4

, ;is not as deeply inmined as that observed in FS2-T1 No offsets were '

. observed in the unta Creek units adjacent to this chanaal. A lower stratigraphic unit below the chassel fill did indicata some offsets 7

and minor folding of a silty-elay bed. A small graben wem observed. '

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an overthrust, and an underthrust.. Stratigraphically lower units . . ",'

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beneath these struatures are massive and undisturbed. These features '

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- appear to be the.reedt of downsampo dess-dip progressive slip failure _ ,-

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' M aIthe' access roadcut, an extensive nesber of offsets and apperant -

efieste can be observed in the Belm Creek Terrace units. The apparent

! offsets appear to be the result of a cut and fill, erosion-deposition l esquence in an active fluvial environment. Continuous undeformed units '

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I D can oftsm be seen stratigraphically below these waitd.' h topegraphic I

.' 'relisf adjacant to thin rondent is extreme with a deeply incised stream

~!  :(Purgatory Croak) ismediately to the southemmt. Thef fault offsets i  ?. v[M sppear to. be discontinuoun and in most esses centtamus units are ,

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~ 7$ present stratigraphica117 belew these offsets ; At a ausdner of locations .. .

/c g'%sf these effsets, pite have been made into the slope often rev=WE .

i J n M1 a' aurving slip surface. At the northern and of this ene, the under- ,  :.

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lytag Astoria formation is exposed. Several ame11 effsets (141 ashes) p {,W.

,- y$@:bgdeem he ensarved la this unit het the freaturesqa ',;.w I

VMc cm. d do not effeet the overlying Beim Creek Terrace maits. .

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'l .1 ( M; 7mmediately adjacent to the Purgatory 3 s.rea aleeg, v -the railway is a 50- large vertical esposure'of Astoria formation 'and Helm Creek Terrace  ; 'SM l

M' . !j 0 l ' units. h so-called " railroad fault" im a set of essentially conjugate ,

j shears whteh displace gravel mits within the Astoria approxbeately  ;

. 1 1/2 feet er less. The fault mone itself is about 1/4" to 1/2" wide and is completely 11thifted. The Astoria Formation appears to have

- - been eroded prior to depeeftion of the Belia Creek Terrace mits. Tais -

",. .. -erosion has left; the fault asas at a higher.rtdiaf in the form of a I

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^q^wpine which projects I/2" or so above the erosion surface. h faul. .9 w

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i Tessa was evidently completely 11thifted, and 'apre resistant to eronima eE '

i '. than the Astoria Formation surroundtag it and was not cut down as a T '

quickly- This fault does not displace the ovarlying well-bedded Helm

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Creek terrace units. ,.

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' il spent some tima viewing the small faults in trenehes GM-24, 25, 27, l 28, 40, 43, 44, 81, 82 as located in Pisure 4.3.1 of the February 24, ' '

l ' 1978 Wodward-Clyde Consultants report, All of the faults obearved sere reverse faults in the Astoria Torsation bedrock with apperunt . 1, rdips of approximately 30 degrees,'vith dip seperations ranging from i,7

. 'O.5 se 2.5 feet. A dissosal trumah across WF-5 (Treesh GM 40) indi - d 7.p$S sated the presence of one offset of about 0.5 feet dip separatism wi f Na reverse sense af sevement. In several trenshes, observation fadicates

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,',- . that the fault planes do not displace the distinctive weathering front j that forms on the datoria Formation. All of these trenches have been umpped and as ensavat$on preeneda, further mapping will be done and .

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Hydrologic Engineering Evaluation ,

of Dewatering System WPPSS Nuclear Projects 3 & 5 The CP Safety Evaluation Report for WPPSS 3 & 5 stated that the staff would review the applicant's proposed dewatering system to ensure that design bases assumed during the CP review were conservative.

Information gathered during construction excavation was te be reviewed to confirm that design parameters such as permeability, porosity, and storage coefficients were adequately considered in the original design. The required information, " Analysis of System Performance and Data to Date," was submitted on March 3,1978, for staff review.

Based on an independent review, we conclude that the data and information provided in the report indicate that the assumed design bases are conservative. However, the report and data are relatively incomplete because adequate time has not passed to allew groundwater levels to stabilize. In addition, heavy rainfall in the area has maintained high groundwater levels. Due to this heavy rainfall and the relctively impermeable soils and rock which exist in the site area, steady-state tlows to the foundation excavation have not occurred.

+

i We, therefore, conclude that certain additional measures should be implemented, so that better data are provided as soon as possible to

, l fully confirm the conservatism of the design bases. These measures are:

1 (1) Piezameters (or inclinometers) should be established closer to the wall of the excavation. We understand that the applicant intends to establish the permanent monitoring program soon; this program (with  !

( ueasurements taken at least 10 feet from the excavation) is acceptable for

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construction monitoring. In addition, the piezomet;ers should be checked for functional reliability on a periodic basis or when .

readings appear to be inconsistent.

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(2) Better control measures for management of surface water and site precipitation should be established and the effects of site f runoff minimized. We understand that the previous problems j with precipitation and subsequent runoff were temporary and will be corrected as work proceeds.

(3) Data, interpretation and conclusions should be submitted for URC staff review at 3-month intervals. If it is found that site conditions have stabilized, or are stabilizing as expected, the ,

reports could be submitted less frequently. The next such report should be submitted on or before June 3,1978.

Subject to compliance with the above commitments, we conclude that the design bases for the system are conservative and,f.nsofar as hydrologic issues are involved,that construction may begin. Final approval of the dewatering system, however, should be deferred until steady state conditions are reached and more accurate data have been receiv.ed.

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