ML20032A076

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Penecontemporaneous Deformation Zones
ML20032A076
Person / Time
Site: Wolf Creek Wolf Creek Nuclear Operating Corporation icon.png
Issue date: 05/20/1977
From:
DAMES & MOORE
To:
Shared Package
ML20032A071 List:
References
NUDOCS 8110280256
Download: ML20032A076 (30)
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{{#Wiki_filter:,_ 1 i 1 1 1 l I i PENECONTEMPORANEOUS DEFORMATION ZONES l WOLF CREEK GENERATING STATION BURLINGTON, KANSAS FOR I KANSAS GAS & ELECTRIC COMPANY i 1 l DAMES & MOORE l Nu.tber 7699-055-07 Job. PDR ADOOK 05000482 ^ 20, 1977 8110280256 811020 May A PDR

I Damas & Mure p='Rg$= .69 (312) 297-6120 d' TTn: 910-253-4097 Cane address: DAMEMORE I I I Kansas Gas & Electric Company i P.U. Box 208 l Nichita, Kansas 67201 Attention: Mr. Gary Boyer Gentlemen: Re: Report Penecontemporaneous Deformation Zones Wolf Creek Generating S_ation ll Kansas Gas & Electric Company E Burlington, Kansas 1 i In accordance with discussions held between repre-l sentatives of Kansas Gas & Electric Ccapany, Dames & Moore and the Nuclear Regulatory Commission at the Kansas Gas & Electric l field offices on the 2l h of April, 1977, we are enclosing 35 copies of our Draft Report entitled "Penecontemporaneous j Deformation Zones, Wolf Creek Generating Station, Kansas Gas & i Electric Company, Burlington, Kansas". l If there are any questions regarding this Report, l please contact either John Trapp or myself. Very truly yours, i l DAMES & MCORE <^~@. p _ Conroy h Peter J. Associate PJC:jj 35 Copies Submitted cc: Mr. J. Arterburn (w/l copy of report) Kansas Gas & Electric Company

1 i 4 a i i 4 ) I l TABLE OF CONTE"TS !I t J, Pace l Z"TRODUC'.'avN AND PURPOSE .............................. 1 4 ..r.u. r.v. e or C O CU.M.E"..'a's*. 'G. Pa ".7.P. S r".*. r D ". I

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r v .r e. 1 2 i DESCRIPTION OF PE"ECONTEMPORANEOUS 20NES............... 4 ) Excavation Slopes, Diesel Generator Building and Control Building 4 I Excavation Slcpes, Fuel Building 5 I Excavation Slope, Circulating h'ater System Pipeline Trench 7 Excavaticn Slope at Approximately I E 100033 and N 100360 to 100400 North End of Turbine Building 7 Excavation Slope at Approximately N 100465 and E 100024 to E 100027 " orth End of Turbine Building 3 GEOLCGIC II.TERPRETATION OF FEATURES OBSERVED 3 CC"CLUSIONS .......................................... 9 ADDITIO"AL INVESTIGATIONS............................. 10 I I I Dames & Moore 11

r I LIST CF FIGURES I Number Title I 1 "1.ot Plan 2A East Excavation Slope of Diesel Generator Brilding From N 99,000 to N 100,010 2B North Excavation Slope of Diesel Generator Bui.' ding From E 99,840 to E 99,748 2C South Excavation Slope of Diesel Generator Building From E 99,748 to E 99,840 2D East Excavation Slope of Diesel Generator Building From M 99,910 to N 99,957 i { 2E East Excavation Slope of Diesel Generator Building From N 99,922 to N 99,930 3A West Excavation Slope of Fuel Building From N 99,844 to N 99,810 3B West E::cavation Slope of Fuel Building From N 99,810 to N 99,767 4 West Excavation Slope of Circulating Water Pipeline Trench From N 99,630 to N 99,670 I 5 Excavation Slope of Turbine Building From N 100,400 to N 100,360 at E 100,035 6 I North Excavation Slope of Turbine Building From E 100,024 to E 100,037 at N 100,465 View of Jackson Park - Upper Heumader Shale Contact. Control Building West Excavat. ion Slope Photograph 2 Close-up View of Area Shown on Photograph 1 I I Darms & Moore

I PENECONTEMPORANECUS DEFORMATICN ZONES

  • WOLF CREEK GENERATING STATION KANSAS GAS & ELECTRIC CO.

BURLINGTON, KANSAS I i INTRODUCTION AND PURPOSE On Sunday, April 24, 1977, during Geological Mapping of Excavations at the Wolf Creek Generating Station, Unit No. 1, Dames & Moore geologists observed the i presence of penocontemporaneous deformation zones in which j j faulting and shearing were present in the excavation slopes. !E Dames s Moore notified x nsas Gas s Electric Co=pany <xGsE) g i of the presence of these zones on Monday, April 25, 1977. The Nuclear Regulatory Commission (NRC) was notified by 4 4 KGsE on Tuesday, April 26th. On Thursday, April 28, 1977, i 1 Messrs. C.

Oberg, A.

Rosenberg and J. Harris of the NRC I visited the site. During this visit, it was concurred by ei I the parties involved that the penocontemporaneous Ceformation 4 cones should no* affect the safety or design of the plant l 3 Penecontemporaneous = a geological proccss occurring j g immediately after deposition but before consolidation of the enclosing rock. Penecontemporaneous deformation = deformation that takes place in sediments during or irmediately ( g E

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th ir d 9 si= ion-Ino udos many varioties of i I soft-sediment deformation, such as small-scale slumps, crumpling and brecciation, but in some areas (as the northern Apennines, Italy) features of large dimensions. l Source: American Geological Institute, Glossary of Geology. ll !11 1 1 I Dames & Moore 4 ,..,.-,-.,..,--.,.-.v,.-.--...- ,,,,,.n.-.,..-n _,,,.,.,,.._,,,,,,--,,.-,,.. _,n -,.--,. _,,-,, ,,,,,-.,,-,n-,-, ,,--,-n._-,.g.,y-y..,--

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t i since they are noncapable features as defined by 4 i appendix A to 10 CFR 100. IIowever, the tiRC concluded 4 1 i that a report should be prepared dccumenting the existence and l the noncapability of these features and submitted to the ';RC i j by RG&E. In association with the identification and dating of the penecontemporaneous deformation zones a re-evaluation of the bearing capacity and settlement characteristics of I i the foundation materials was performed. The purposes of this report are to: 1 1. Present a review of pertinent portions of the PSAR relating to previously j dccumented penecontemporaneous deformation; 3 i 2. Describe and document the l penecontemporaneous deformation j zones found to date within the excavation; i j 3. Discuss the effect of the penecontemporaneous deformation j zones on the safety and design of the j plant. 'li 4

  • Appendix A to 10 CFR 100 defines a capable fault as i

i a fault that exhibits cne or more of the following charactor-istics: 1. Movement at or near the ground surface at i least once within the past 35,000 years or j movement of a recurring nature within the cast 500,000 years; 4 i E 2. nacro-seismicity instrumental 11 ! 3 determined with records of sufficient j precision to demonstrate a direct { relationsnip with the fault: i l 3. A structural relationship to a capable fault according to characteristicc (1) or 1 (2) of this paracraph such that movement on one could be reasonably expected te bc ) accompanied by movement on the other. 2

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1 1!I Excavation mapping is currently proceeding at the j Wolf Creek site and will continue for the duration of i I j plant construction. Therefore, the final documentation of the geologic conditions encountered at the Wolf Creek site + i will be presented in the Final Safety Analysis Report I for f i the Wolf Creek Generating Station. I REVIEW OF DCCUME::TATIO:! PRESE!!TED IN THE PSAR 1 i During the PSAR investigations, examination of 4 ( j the borings drilled on site indicated the presence of slicken-1 i sided fractures. These fractures were noted ori=arily in the Snyderville Shale T. enter, although such features were t noted in most of the shale units includinc_ the u.c.cer Heu=ader. 4 i The presence of these slickensided fractures was documented 4 4 in the PSAR, primarily in Section 2.5.1.2.4, Site Structural i, Geology. It was established that these slickensided fractures i i were probably the result of penocontemporaneous deformation 4 primarily by differential compaction along the edges of the Vinland Sandstone channel noted in the area of the t l Catecorv 4 - I structures (see Section 2.5.1.2.2.2.1.1.2.2.1 i { and Figure 2.5-23 of the PSAR). 4 I h Penecontemporaneous deformation due to overloading of beds during deposition has been dccumented for many of the Pennsylvanian units fcund at the site. This is referenced and docenented in PSAR Sections 2.5.1.2.2.2.1.1.2.1.3., .i } ..n..s. ..a ..a....m.... 1... t!I ,i I 3 D * "" # " i,I . - _. -,.. ~ _. _.... ~.

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1 i 4 Six faults documented within 50 miles of the 1 i j site (Fau'.:s 5,3,9, 10, 11 & 12 Figure 2.5-10 and Table 1 2.5-10) were interpreted to have resulted frcm penecon-temporaneous deformation of the Pennsy'_vanian deposits. These six faults are.not capable since they occurred over 280 millipn years before the present and have been documented to i have resulted from penecontemporaneous deformation. Penecontemporaneous deformational features ) were noted and documentcd in the PSAR both at the site and } in the site regicn; therefore, the presence of such features i l' in the site excavations was not unexpected. I 'E DESCRIPTION OF EMECOMTEM RAMECUS "CNES iE l l During the geological mapping of excavations, I presently being performed, five areas of penecontemporaneous deformation have been found within the upper Heumader unit. The positions of these areas are shown cn Figure 1. The following is a description cf the observed deformation in these areas. I Excavation Sloces. Diesel Generator Buildinc and Control Buildinc Fesults of geologic mapping of the excavation sleges for the diesel generator building are presented on Figures 2A through 2E. Exanination of all three lI I I Dames & Moore 4

1 1 lll j l. i j excavation sl; pes for the dienel generator building shows that the icwer Heucader-upper Heucader contact is undisturbed. l Also a horizontal band of dolenitic siltstone nedules located approximately 1 foot above the contact is undisturbed. l At the south end of the east excavation slope just above the br:d of nodules is a small tight anticlinal fold (Figure 2E). Extending upward frca the fold is a l northwest-trending reverse fault or shear plane in which the south side has coved up relative to the north side. As the zone of faulting or shearing is traced upward, it spreads out into an anastenosing series of shear and { fracture planes until n: apparent novement is visible at the top of the slope. The upper part of this zone is highly-weathered, locally distorted and broken. The Jackson Park Sandstone had been recoved frca above this excavation slope by construction activity prior to discovery of the penecontemporaneous deformation 2cnes. Projection of this deformation zone into the cut slope would intercept the west end of the north excavation I slope of the diesel generator building. As shown on Figure 23, no displacement is noted at the west end of the north excavation slope, only an area of relatively close).y-spaced vertical fractures. Continued northwestward projection of this . 11 penecentemporaneous defcrnation tone would intersect the west excavation sicpe of the control building. The 1 Jackson Park Sandstone-upper Heucader Shale contact in this area is completely flat lyina and undisturbed over the entire arnes .OOre =

1 i !11 1 !11 I length of this cut slope (Photos 1 and 2). I 11 Excavation Slcres, Fuel Buildinc a l The penecontemporaneous deformation zone located I i in the west excavation slope of the fuel building trends southeast along the projection of the penecontemporaneous zone found in the east excavation slope of the diesel i generator building (see Figure 1). At this location, however, the north side of the fault (shear plane) within f this penecontemporaneous deformation zone has moved up relative l to the south side (see Figures 3A and 2B). This is the opposite l 4 i sense of displacement found within the excavation slopes for i i the diesel generator building. At both of these locations all i the deformation has occurred above the upper Heumader-lower i Heumader centact as well as above a band of dolomitic siltstone nodules just above the contact (Figures 3A and 3B). 1 Just above the band of dolcmitic siltstone nodules is a small anticlinal fold frcm which a reverse fault or shear plane propagates upward. As this deformation zone is traced upward f fron the fold, the fault beccmes extremely low angle near the top of this excavation slope (Figure 3B). This zone can f he traced around the corner of the west excavation slope to the ,1 south excavation slope of the fuel building. Examinaticn of th' deformation cne in the south excavation slope has J 4 shown a mirror image of "he features observed in the east mcavation slope. 4 4 n j 6 !ll Cames G Moore 4 J ....--n-- - - - - - n----,-.. .-n ..w-,-a .,m..,<,-,_ n -,.-v.-e a,.-,,

Excavation Sloce, Circulatina Water System Piceline Trench A third zone of penocontemporaneous deformaticn has been found in the circulating water system cineline trench at the location shoun on Figure 1. This zone is directly along trend with the zones found in the diesel generator building and fuel building excavation slopes. The map of the west excavation slope of the circulating 1ater i l system at the location of this deformation zone is snown on Figure 4. This penecontemporaneous deformation zone has the same sense of displacement as the zone found in the fuel building excavation slopes. The Jackson Park-upper Heumader Shale contact over this deformation zone displays no evidence of offset; however, the contact does display a gentle increase in elevation in the area just above the penecontemporaneous deformation zone. Just below the Jackson Park-upper Heumader Shale contact several undulating beds can be obrerved. The nature 1 l of these undulating beds is typical of soft sediment deformation. 1 11 Excavation Sloce at Accroximatelv E 100035 ' nd !! 1003cn n 100100 '!or*h End n m v-4-- Bui!S4 r e A small penecentemporaneous deformation acne has been fcund at dus location, and a map is presented on Figure 5. This none is located just above the Icwer Heumader-upper Heumader contact and terminates ince clayey 7 Dames & Moore -. ~.

l .I bedding planes at both its upper and lower contact. i Excavation Sloce at Aporoximately N 100465 and E 100024 te E 1000d7 ;orta Enc or Turoine Bu11cina r { \\ At this location, a small penecontemporaneous l deformation =cne has been mapped. As shown on Figure 6, this zone terminates abruptly at the Jackson Park-upper Heumader Shale contact. The contact displavs no evidence t of offset but does show a slight rise in elevation over the zone of deformatien, I GLU LL..L r-- -. u.m e n,~ ; r m..iA L.4 O.e v.r_ rs r m., r o.e ---u - c -. v U n ro,ur n .6-. r..~ v s i Following deposition of the Heumader Shale, a short pericd of nondeposition occurred in the plant site l area. During this period, the Heumader Shale was underccinc \\ consolidation. The start of Jackson Park depositica applied I a surcharge on the underlying beds. Although this additional pressure was not great enough to affect the more I calcareous lower Heumader. However, this additional pressure t produced the deformation in the less calcarecus and cc=petent l beds of the upper Heumader by gravity sliding and slumping as a means of adjustment to these pressures. Several observatic.s support this conclusion. 1. In the east excavatica slope of the diecel generator auilding, the ecne of defer =ation is a tight anticlinal fcid just above the icwer Heumader-i upper ;eumader contact. As the penecontempcraneous deformation ecne l Games & Moore _ _ -- _ -._ _--- -._..-,..-.-~-. ..n,._

l 1 i is traced upward, the scne becomes more spread out and anactcmosing, strongly suggesting a relatively large decrease in confining pressure upward with a low confining pressure at the top of the cut slope; 2. The slip surface in a passive failure wedge in soft material under surcharge loading would have the geometry of the l plane of movement observed in the fuel building excavation slopes; i 3. The tight folding without fracturing mapped at most zones suggests the t deformation occurred while the shale was in a more plastic state than present; 4. The undulating bedding noted in the circulating water system pipeline trench is characteristic of soft sediment deformation; 5. The Kerford lir.estone is absent in the plant area as was noted in the F5AR and confirmed during excavation mapping. This is indicative of a diastem prior to deposition of the Jackson Park Sandstone; this supports conclusion 1 in that there was a geologic period when there were no overlying units to supply a confining pressure; 6. No offset of beds is present at the Jackson Park-upper Heumader contact; l E 7. There appears to de a characteristic 3 slight rice in the Jackson Park-upper i Heumader contact just above the penocontemporaneous deformation zones; l the slight rise is indicative of the deformation occurring during the onset of Jackson Park Sandstone deposition before these beds were consolidated. CCNCLUSICNS As detailed in the preceuing sections and shown en :ne attacned maps and photograt is, all examples of I () Dames & Moore I

~ - - _. l l ll 11 l penocontemporaneous deformation found to date within the site excavations have been totally confined within the upper Heumader Shale unit. The deformation and associated faulting 11 t and shearing do not cut the underlying lower Heumader or the overlying Jackson Park Sand 3 tone. This evidence establishes the last age of deformation as Pennsylvanian (over 280 million years before the present). There is no known i macroseismic activity associated with these zones and no I ,i structural association with capable faults. The faulting, shearinc and deformation, therefore, are noncapable as defined I by Appendix A to 10 CFR 100. I In order to evaluate the effect of the shear cones on the proposed structures, fcundation bearing capacity and settlement analycas for the affected structures have been reviewed. E:: amination of the in-situ materials indicates i that the compressibility of the material within the i penecontemporaneous deformation zones does not significantly differ frcm the values for the surrounding shale that were i utilized in analyses. Therefore, previously computed i settlements for structures founded over the penecontemporaneous deformation zones are not significantly affected. The attitude of the shear zones will not adversely affect the hearing capacity. m D.. n..n..u ... V o-.. c.. C,.,.c u _en.< Dames a " core will continue to map an photcgraph all Catecory I ana safety-related excavations. The results names & Moore

P of the mapping program will be presented in a series of l r rapcrts to Kansas Gas & Electric Company. These reports L will consist of all maps and selected pho cgraphs of I r i e::cavation sleges and floors and 'till ecnstitute the documentatic of the geclegic conditions encountered in the excavation. A final report will be cc= piled and presented in the Final Safety Analysis Report for the Wolf l C. e a d. G e..e.r. a '- 4.., .c ' a *- c.. 4 i I !I f !I i L i' i f 1 I i l I l-i. a r I I s I 17 Dames & Moore I ~

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