ML20197G429
| ML20197G429 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 05/14/1984 |
| From: | Alterman I Office of Nuclear Reactor Regulation |
| To: | Rolonda Jackson Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-0755, CON-WNP-755 NUDOCS 8405290398 | |
| Download: ML20197G429 (2) | |
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!!EMORATIDU!! FOR: Robert E. Jackson, Chief Geosciences Branch Division of Engineering THRU:
Stephan Brocoum, Leader Geology Section Geosciences Branch, DE FR0ft:
Ina B. Alterman, Geologist Geology Section Geosciences Branch, DE
SUBJECT:
REVIEW 0F BUIP WORKSHOP Atl0 00CUf!EtiTS C0t1CERfilNG THE SEISfl0TECTOMICS OF HAftFORD, UASilINGTON AND VICINITY I have reviewed the BUIP Workshop and other documents provided by Division of Uaste Itanagement to evaluate the possible impact of new information on the WNP #2 site. These included:
(1) Viewgraph copies from 00E/flRC Status Workshop on Geology of BWIP, held in March, 1984 (2) Sumary reports of the workshop by LLf!L and Weston.
(3) Manuscript of "The Saddle itountains: Evolution of an anticline in the Yakima foldbelt" by S. Reidel.
(4) ?!anuscript of " Post-12 nillion year clockwise rotation in the central Columbia Plateau, WA" by S. Reidel, G. P. Scott, D.R.
Bazard, R. W. Cross and B. Dick.
From the infornation provided it is concluded that new develeprents in the continuing investigation of the geology and seismology of the Hanford region do not require any changes in the GSB positions as stated in the SSER for the UNP-2 CL review.
!?oreover, some of the newer data and interpretations support the conservative positions taken by the staff with respect to specific tectonic structures and relationships. These include:
(1) Paleomagnetic data in the Yakina foldbelt shcw a clockwise rotation across the hinges of several Yakima folds, interpreted by Reidel to indicate local dextral shear in a narrow zone trending fit!W.
This is consistent with the staff's interpretation of RAW as a dextral shear zone, with chlique movement.
(2) New gravity modelling and ground magnetic modalling of the ancmaly that delineates the Yakina Barricade (the linear that parallels and may be part of RAW on either side of which is a significant cleictica u;i-cf t hydn ulic ho d) su m st: t hat faul' mm;
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NAY 14 E64 fits the data better than a renoclinal flexure.
Stratigraphic inforratien on either side of the barricade suggests the absence of strata on one side as well. These lines of evidence sucport the staff's SSER positicn that PAU is a continuous fault. This evidence coupled with the paleomagnetic evidence of rotation and dextral shear of folds along RAU further confirm the staff position on the character of PAW.
(3) The pacer on Saddle flountains, describing the evolution of the structures in the Yakima fold belt, is based on detailed i
stratigraphic neasurements showing a decrease in folding upward through the basalt section. The nadel devninood by Reidel shcws that the faulted anticlines developed throuch stages with the faulting and folding almost sinultanecus, and the folding somewhat secondarv to faulting. This also supports positions taken by the
?'PC consultants, the USGS, with strong concurrence from the fiRC stiff.
!;o other information irpacted on the evaluation the UilP-2 Panford site.
N Ina B. Alternan, Ceolc. gist Geology Section Geosciences Cranch, DE cc:
S. Brncoun L. Reiter J. Kinball IBUTI0ft:
P. Lefevre A.
V.. Ibrahin GS A. Schwencer R. Auluck l
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