ML20213E137
| ML20213E137 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 04/16/1982 |
| From: | Rolonda Jackson Office of Nuclear Reactor Regulation |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-0507, CON-WNP-507 NUDOCS 8205050171 | |
| Download: ML20213E137 (9) | |
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DJ5TRIBUTION:
,00CKET FILE APR 161982 GSB RDG m
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itE!t0RA! DUM FOR:
Al Schwencer, Chief 2
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APR2019eg d Licensing Branch No. 2 DL FR0ft:
Robert E. Jackson, Chief Y
Geosciences Branch, DE g
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SUBJECT:
REVIEU QUESTI0flS FOR WitP #2 FR0'1 USGS 6
attached are review questions from our consultant, the USGS, to Washington Public Power and Supply System, on the WitP-2 site. They represent some of the concerns held by the USGS about the site region.
41 1n31 Signed by 8
a E. Jackson Robert E. Jackson, Chief Geosciences Branch Division of Engineering
Attachment:
as stated cc: w/ attachment R. Tedesco J. Knight
.t. Mallory R. Jackson L. Reiter S. Brocoum J. Kinball H. Lefevre A. K. Ibrahim R. a luck u
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.j Draft Status Review Hanford, Washington M. H. Hait and D. D. Di.ckey April 2,1982 Washington Public Power Supply System Nuclear Project No. 2 Benton, County, Washi'ngton NRC Docket No. 50-397 Comments on Geology Tectonic Models In spite of the large quantity of geologic work in the Hanford area including the FSAR (Amendment 18), the analyses and models that the applicant has supplied regarding the structure and tectonic setting of the site area are inco,mplete.
Full written explanations of the applicant's recent thinking, expressed only cursorily at the November 17, 1981, NRC/USGS/WHP-2 meeting, and clear integration of this thinking into more quantitative, accurate models of the geology of the site area and its envircrs are needed. The models should be compatib.le with all details of the known geology and should include enough detail to permit full evaluation of the applicant's analyses of seismic probability and segmentation and capability of faults.
A list of " conclusions" regarding structure and regional tectonics presented at the November meetin'g by G. A. Davis, a consultant to the applicant, is here reproduced, for use as a reference in our specific requests and as a possible partial outline for response by the applicant.
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" CONCLUSIONS -- REGIONAL TECTONICS AND STRUCTURAL GEOLOGY "1.
TECTONICS OF COLUMBIA PLATEAU, FOR AT LEAST PAST 15 M.Y., ARE PRIMARILY A RESP 0ftSE T0 fl0RTH-S00TH SHORTENING ( AND A PROBABLE tt0RTH-SOUTH ORIENTATION OF SIGl!A 1)
(DAVIS).
ESTIMATES OF TOTAL NORTH-SOUTH SHORTENIffG RANGE FR0ft 2 TO APPR0XIMATELY 77. (BENTLEY, 1980; LAUBSCHER, 1981).
"2.
MIOCENE AND YOUNGER COMPRESSI0tl IN THE COLUMBIA PLATEAU AND BLUE MOUtlTAINS PROVINCES HAS OCCURRED SYt;CHR0ft00 SLY WITH EAST-WEST, THEN NORTHWEST-SOUTHEAST EXTENSION IN THE GREAT BASIN PROVINCE TO THE SOUTH.
COMPRESSIONAL DEFORtiATION IN THE FORMER AREAS PP,0BABLY REPRESENTS AN INCOMPLETELY LINKED RESPONSE TO EXTEtiSION Ifi THE LATTER AREA (LAUBSCHER,1977, 1981; DAVIS, 1977,~ 1981; SMITH, 1978).
"3.
THE, PRINCIPAL PLATEAU STRUCTURES ARE (1) FOLDS WITH EASTERLY TRENDS AND (2) FAULTS OF TWO BROAD TYPES: (A) THOSE WITH STRIKES PARALLEL OR SUB-PARALLEL TO FOLD TRENDS, BOTH OF REVERSE AfD NORitAL TYPE; AND (B) THOSE WITH STRIKES AT HIGH ANGLES TO FOLD TRENDS, MOST It:PORTANTLY WITH NORTHWEST STRIKES At:0 A C0i PONENT OF DEXTRAL SLIP.
"4.
PLATEAU FOLD STRUCTURES ARE NOT RELATED TO DISPLACEMENTS ALC'3 STEEP (60*+) REVERSE FAULTS THAT ROOT INTO THE BASEMENT AS PROPOSED BY BEilTLEY (1977).
"5.
PLATEAU FOLDS ARE PROBABLY f0T RELATED TO SOUTH-DIPPING' THRUST FAULTS THAT TRANSECT THE EllTIRE CRUST AND ROOT INTO A REGI0f!AL DECOLLEMENT THAT DETACHES CRUST FROM MANTLE AfiD ROOTS BEllEATH THE BLUE MOUNTAlf!S PROVINCE (AS PROPOSED BY LAUBSCHER, 1977,1981).
"6.
PLATEAU FOLDS. APPEAR TO REPRESEllT A STRUCTURAL SPECTRUM BETWEEN (1) PRIMARY FOLDS WITH SECONDARY REVERSE (OR THRUST)
FAL".TIllG, Afl0 (2) SECONDARY FOLDS RELATED T0' INTRA-CRUSTAL THPUST-TYPE DETACHitENTS OR LESS THROUGHG0ING ZONES OF INTERCONNECTED FAULTS AND KINK-BANDS (PRICE, 1980; DAVIS, 1981; WCC, 1981; BRUHN, 1981; COWAN, 1981).
"7.
AVAILABLE DATA AND CURRENT FOLD / FAULT THEORY FAVOR MODELS OF PRIMARY FOLDING WITH SECONDARY REVERSE AND THRUST FAULTING FOR THE UttTANUM-GABLE MOUNTAIN STRUCTURAL ALIGNMENT (PRICE, 1980; GOLDER,1981; DAVIS,1981; C0WAN,1981; WCC,1981) 2
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" DAVIS, TENTATIVE C0fiCLUSI0ftS,11/9/81 CONT., P. 2 "8.
PLATEAU FOLD TRENDS ARE Af!0MALOUSLY t!ORTHWESIWARD Ill A SOMEWHAT DIFFUSE Z0t!E THAT EXTErlDS i:0RTHUESTWARD FROM WALL GAP AT LEAST AS FAR AS THE EASTERN EtiD OF RATTLEstlAKE HILLS.
THIS ZONE WAS RECOGNIZED BY RAISZ (1945) AS PART OF HIS CLE ELUM-WALLULA LIffEA11EtlT (CLEll).
RAW IS THE ACRONYM GIVEN THIS ZONE BY WCC(1981) FOR ITS LENGTH BETilEEN THE RATTLESNAKE HILLS AtiD THE VICINITY OF MILTON-FREEWATER.
"9.
THE GE0t!ETRY AND kit lEt!ATICS OF STRUCTURES IIITHIN RAW SUGGEST THAT IT IS A C0t! PLEX ZONE OF FOLDING AtlD FAULTING, THE LATTER CHARACTERIZED BY DIVERSE AND SUPERPOSED COMP 0tlENTS OF BOTH REVERSE AND DEXTRAL STRIKE-SLIP.
"10. NO COMPELLING DAT.A ALLOWS AN UNEQUIVOCAL CHOICE BETWEEN TWO PREVAILING TECTONIC tt0DELS:
(1) CLEW (RAW) IS THE STRUCTURAL EXPRESSION OF A BASEMENT Z0fiE OF DEXTRAL WREtlCH-FAULTING THAT BECOMES EITHER DEEPER (LAUSSCHER, 1977,1981) OR BROADER AND t:0RE DIFFUSE (DAVIS,1981) TO THE NORTHWEST; (2) RAW IS THE C0!1 SEQUENCE OF f40RTH-SOUTH COMPRESSION OF' PLATEAU STRATA AGAlf!ST A TRIAf! GULAR, RIGID BASEMENT " BUTTRESS" WITH A NORTHilEST-TREF;DIrlG SOUTHERt180UtlDARY WITH A C0t!P0ftENT OF ASSOCIATED STRIKE-SLIP DEFORTiATI0ff (PRICE,1981). N0 BASEttENT ZONE OF STRIKE-SLIP FAULTING IS REQUIRED BY THE SEC0 tid MODEL.
THE WIDESPREAD OCCURREtiCE OF SUBHORIZONTAL STRIAE A10f!G MAJOR FAULTS WITHIfl RAW (STEEPLY DIPPING STRIAE ARE ALSO COMM0ft) ARE SUPPORTIVE OF EITHER MODEL.
"11. THE OLYt!PIC-IIALLOWA lit!EAMEt1T IS i;0T A FUNDAt! ENTAL CRUSTAL B0briDARY OF C0tl1ItiEitT-0CEAtlIC TYPE IN THE AREA 0F THE PASCO BASIfl(DAVIS,1981).
GEOLOGICAL INTERPRETATIONS (LAUBSCHER, 1981; DAVIS, 1981) AfiD CRUSTAL GEOPHYSICAL STUDIES (SSS, 1980; WEST 0ft GEOPHYSICAL, 1981) CONCLUDE THAT NEITHER CLEW NOR RAW COINCIDE !!ITH A MAJOR CHANGE IN CRUSTAL COMPOSITION, THE Af1ALYSIS OF ?>0RTH-SOUTH TRENDING GRAVITY ANOMALIES THAT CROSS CLEW INDICATES THAT ANY STRIKE-SLIP DISPLACEttEtlTS THAT ttAY HAVE OCCURRED PARALLEL TO CLEW CANNOT HAVE EXCEEDED TWO OR THREE KILOMETERS (WESTON GEOPHYSICAL, 1981); THE-ANALYSIS DOES NOT DEMONSTRATE THAT STRIKE-SLIP DISPLACEMENT HAS OCCURRED.
MIDDLE MIOCENE BASALT FLOWS AND DIK'ES (CA. 15 MY'P) AND HIGH-ANGLE FAULTS (IrlCLUDIllG THE HITE 8
FAULT) ARE fl0T DISPLACED ALONG THE TRACE OF THE OLYMPI.C-WALLOWA LIflEAMENT AS DRAWN BY RAISZ UP THE SOUTH FORK OF THE WALLA WALLA RIVER (KEtiDALL AfiD OTHERS,1981)."
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Items 4-10 definitely require expansion.
For example, items 4 and 5 are rejections of earlier models, and details supporting such conclusions should be provided.
These new conclusions allow removal of limbs from the fault tree in Apendix 2.5 K.
The structural and tectonic model(s) presented should include enough detail to permit full, accurate evaluation of the applicant's analysis of seismic probability, segmentation of faults, and capability of faults.
Some of the support material expected is:
1.
To-scale cross'section(s) of the geology through the site to a depth sufficient to include the elements critical to evaluation of the model..
2.
To-scale illustration of the geometry and origin of the folds and faults common to the tectonic end-members of the " structural spectrum" referred to in Items 6 and 7 of " Conclusions":
(a) primary folding, secondary faulting, and (b) primary faulting, secondary folding.
3.
Maps and ccess sections of actual examples within the " structural spectrum;" and explanation of how these examples bear on structural interpretations extended into the WBP-2 site area.
4.
Well-illustrated explanations of the structural relationship between the RAW trend and the large folds (Gable Mountain, Saddle Mountains, and Frenchmen Hills) that extend far to the, north and east of RAU.
This explanation should include but not be limited to, adequate analysis of Price's (1981) model, Item 10 (2) of " Conclusions," which suggests many -
miles of northward translation of an originally east-west-trending
- fold, How does this translation take place? What is the evidence for translation and what bearing does the translation represented by this and-other folds have on structural interpretations below the WNP-2 site?
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a 5.
Illustrate explanation of the applicant's concept of "* *
- intracrustal thrust-type detachments and less-throughgoing zones of interconnected faults and kink-bands." How do these relate to the " structural.
spectrum"? Where are they or where would they be expected? Show in schematic cross section(s) the conceptual and spatial relationships between the hypothetical faults and the crustal levels of Appendix 2.5 K
' (WPPSS, 1981), and the examples within the " structural spectrum" (3, above.
Show the vertical zone through which the present-day north-south compression is acting.
- Show depths of significant earthquakes projected into cross section.
6.
Provide comparison, with suitable cross sections, of the structural geology of the Umtanum-Gable Mountain-southeast anticline with Toppenish Ridge.
Explain more fully what leads you to postulate a fault origin for Topponish (WCC. '1981a) and a fold origin for Umtanum-Gable Ridge (Item 7,
" Conclusions").
Active Volcanism The applicant should assess the possibility of having a fissure lava flow at the site.
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References Bentley, R. D,1977, Stratigraphy ef toe Yakima basalts and structural' evolution of the.Yakima ridges in the western Columbia Plateau,' 3 Brown, E. H. and others, eds., Geological excursions in the Pacific Northwest:
Geological Society of Merica, Annual Meeting, Seattle Washington,1977, Department of Geology, Western Washington University,
- p. 339-390.
Bruhn, R. L.,1981, Preliminary analysis of deformation in part of the Yakima fold bel t--south-central Washington:
Report prepared for Washington Public Power Supply System, Inc., Richland, Washington, 27 p.
Cowan, D. S.,1981, The origin of the Umtanum Ridge-Gable Mountain structural trend and implications for a regional tectonic model:
Skagit/Hanford Nuclear Prcject Preliminary Sa,fety Analysis Report,' Amendment 23, Appendix 2S, !!orthwest Energy ' Services Company, Kirkland, Washington, 16 p.
Davis, G. A.,1977, Tectonic evolution of the Pacific Northwest--Precambrian to present:
Washington Nuclear Project-1/4, Preliminary Safety Analysis Report, Amendment 23, Subappendix'2RC, Washington Public Power Supply System, Inc., Richland, Washin,.on, 46 p.
Davis, G. A.,1981, Late Cenozoic tectonics of the Pacific Northwest with special reference to the columbia Plateau:
Washington Nuclear Project-2, Final Safety Analysis Report, Amendment 18, Appendix 2.SN, Washington Public Power supply Sy stem, Inc., 'Richland, Washington, 49 p.
Golder Associates,1981, Coologic structure of thatan'm Ridge--Priest Rap' ids Dam to Sourdough Canyon:
Skagit/Hanford !!uclear Project, Preliminary Safety Analysis Report, Mendment 23, Appendix 2N, florthwest Energy Services Ccmpany, Kirkland, Washington, 54 p.
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Golder Associates,1981, Gable Mountain--Structural investigations and analyses:
Skagit/Hanford Nuclear Project, Preliminary Safety Analysis Report, Amendment 23, Appendix 20, Northwest Energy Services Company, Kirkland, Washington, 77 p.
Kendall, J. J., Dale, R. C., and Davis, G. A.,1981,.The structural
, relationship of the Olympic-Wallula lineament, Hite fault system, and LaGrande fault system, the Blue Mountains of Umatilla County, Oreg6n:
1 Geological Society of America Abstracts with Programs,.v.13, no. 2,
- p. 64.
La'.bscher, H. P.,1977, Structural analysis of post-Yakima deformation, Columbia Plateau, Washington:
Draft report prepared for United 1
Engineers and Constructors, Inc., on behalf of Washin'gton Public Power Supply System, Inc., Richland, Washington.
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l Laubscher, H...,1981, Models of the development of Yakima deformation:
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Washington Nuclear P' oject-2, Final Safety Analysis Report, Amendment r
18, Appendix 2.5-0, Washington Public Power Supply. System, Inc., *,-
. Richland, Washington, 69 p.
Price, E. H.,1980, Strain distribution and.model for. formation of eastern Umtanum Ridge anticline, south-central Washington:
Rockwell Hanford Operatidns, Richland, Washington, RH0-BWI-SA-30, 27 p.
Prf ce, E. H.,1981, Structural geometry, strain distribution, and mechanical evolution of eastern Umtanum Ridge, and a comparison with other selected localities within Yakima fold structures, south-central Washington:
Rockwell Hanford Operations, Richland Washingto.., RH0-BWI-SA-138, 99 p.
Raisz, E.,1945, The Olympic-Wallula lineament:
American Journal of Science, 4
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- v. 243-A, p. 479-485.
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Smith, R. 8, 1978 [perhaps 1979], Seismicity, crustal structure, and intraplate tectonics of the interior of the western Cordillera, irt Smith, R. B., and Eaton, G. P., eds., Cenozoic tectonics and regional geophysics of the western Cordillera:
Geological Society of America Memoir 152, p.111-144.
SSS,1980 [ System, Science, and Software,1980], Determination of three-
' dimensional structures of eastern Washington fecm the joint inversion of gravity and earthquake travel time
- data:
Report prepared for Weston Geophysical Corporation by Rodi, W.
L., and others,143 p.
WCC,1981 [ Woodward-Clyde Consultants,1981], See WPPSS,.1981.
WCC,1981a [ Woodward-Clyde Consultants,1981a], Task 05, Toppenish Ridge Study:
Report prepared for Washington Public Power Supply System, Richland, Washington.
Weston Geophysical Rasearch, Inc.,1981, Compilation and interpretation of gravity in Washington, Oregon, and adjacent parts of. British Columbia and Idaho:
Washington Nuclear Project-2, Final' Sa,fety Analysis Report, Amendment 18, Appendix 2.5L, Washington Public. Power Supply System, Inc., Richland, Washington, 28 p.
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WPPSS,1981, Seismic exposure analysi, for the WNP-2 and WNP-1/4 site:
Washington Nuclear Project-2, Final S;fety Analysis Report, Amendment 18, Appendix 2.5K, Washington Public Power Supply System, Inc.,
Richland, Washington, 95 p.
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