ML20053A625
| ML20053A625 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 04/17/1982 |
| From: | Thompson G AFFILIATION NOT ASSIGNED |
| To: | Griesmeyer M Advisory Committee on Reactor Safeguards |
| References | |
| ACRS-CT-1441, NUDOCS 8205270026 | |
| Download: ML20053A625 (1) | |
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George A. Thompson g
421 Adobe Place S
Rg'm ~,'MED Palo Eto, Califomia 94306 C
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h1Ay g neggf.f IO82A Arril 17, 1982 t[
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To:
ACRS via Mici.aol Griesmcyer N
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From:
Georce A. Thcmnson, Concultant Subj.:
Lineamenta ett. :ied during Geclogic fi el d trips, vicinity of M ".E site, Richland, '7n.
Cn '.cril 11 an~ 13 I incpccted several suspcct lineaments in compon; ::l th 33 an' 17 nersennel, consultants ani ethers.
G micric m m, ncrjr1 rhettgranh.e en: gecrhysical data were also rrerentm.
My cencluc' enc can be summaricc6 brie fl y.
1 The Rattlesnake Mcuntain lineamente, three o f which have been trenche-to a iept!' o f about 20 feet, have nothing to dc with faultinE.
They ar" shorc'ine featurec of an ancinnt lake, with ice-rr f te' heulderc alonc thc ctrand line.
The trenches demon-stratc nc e f fect at the ton boundary of a deenly buried all uvial fan.
2.
The 7emas Valley fault, abcut 5 mi, long, is the headwall scarr c f a / cry large 1cndalide, the toe o f which is easily recog-nizci over the sam; linear distance ac the headwall scart.
Furtner evidence that thic fault is merely rart o f a landslide:
a typical hea ":M 1 graben in the rull-apart zone, the tectonic setting, the d
ctratigr,-hic, tcpegraphic and hydrclegic envircnment, all o f which orc ccncietent with l andcliding.
The '."emas Valley landslide would pecc a haz:r ' cnly tc structurec built en cr belc',' it.
3.
The Col: Creek-Eenne":ick lineament is a cecr20 site alisn-if any, faulting.
Lack of mont th,t appears te reprocent little,(resolution 100 feet), lack Ice Farbor bacalt dictl acement c f the c f c rnificent gra9iento er e f fsetc in geophysical anomalics, and brcn. feloir shorn in drill holec an i outcrcpc cuggest ctrongly thct thic feature is net a fault.
I wcc not able to ctcy for the third-day vicit to the Eennewick nart c f the lineament.
4.
Mc ':ec V-11ey f ault.
1 did not have time to vicit thic fcult, rtnic! is about LO mi. west o f the site.
Geologic mapping c!.cus a fault length (eact branch) o f 8 miles, normal displacement c f the Fer.on a flc; cf 62 m denn te the east, and pcssibly a con-cenent of right lateral cli".
The evidence nresented for lateral cli; seems inconclucive.
The fault strikes trdVerse to the "lallula lineament and coul. net 31nh directly to other structures trending toward the cito.
In conclucien the Mexee Valley fault deserves serious study.
Ic it capable?
If ec, cculs it produce hazardous shaking at the site'?
Frehably net, but no evaluation wac nresented.
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