ML20214G668
| ML20214G668 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 12/07/1971 |
| From: | Case E US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Morris P US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| CON-WNP-0143, CON-WNP-143 NUDOCS 8605220382 | |
| Download: ML20214G668 (4) | |
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1577 Feter A. Morris, Director, Division of Beaeter tAma==ing GE0Edm SE15NDIDGT, AND FOUNDATIONS QUESTIGHS - RANFORD 2 BUCIAAR 70WER FLANT, DOCKET NO. 50-397 Questions covering the gaology, seisselegy, and foundations aspects of the Hanford 2 Nacisar Plant are emelesad.
. ' Q.d 23 E.C.CL.
Edson C. Casa Director Division of Reactor Stm.dards i
Emeleeure Questions cc w/encle R. Seyd, DRL V. Stello, DEL L 5. Minogue BBS
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R. b. McN 11ea, DRS
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.1.2/6/71 12/..l.. /71 12(/.../ 71 Form AEC-Ste (Rev 9-33) AECM 0240 o u s wva *we %' mw'*.o oro u se'o-*7 rse 860S220382 711207 PDR ADOCK 05000397 A
!!ANTORD 2 GECLOGY, SEISMOLOGY AND FOU;;DATIONS QifESTIONS 1.
The llanford area has been the object of rumerous and extensive geologic investigations during the past few years In spite of these efforts e
there are still nany unknowns regarding the geology and seisnology which are of significance to the Ifanford 2 carthquale design. Iten a, below contains a list of the major unknosus, the concern of which has generated our questions and connents under iten b. and to sone extent those under 2a.through 21.
Principal unknowns regarding the regional g(ology and seismology a.
of the !!anford area are:
- 1) Poor definition of the structural geology in parts of the Pasco Basin including occurrence of earthquakes whose rcJc tion-ship to geologic structures is not clear;
- 2) the shortness of the historic seismic record and the existence in near surfact soils of what could be local manifestations of earthquakes that occurred before the historical rreerd. Euch features include sand dikes, polygonal patterns in tix coil, and the denseness of the glacio-fluvial deposits,
- 3) the centinuing occurrence of microcarthquakes, the cause of which has not been determined;
- 4) the presence around the Pasco Basin of long folds (sone with faults), several of which, the Yakina Ridge Anticlire, for exanple, plunge beneath the basin. The Yakina Eldie Anticline may have generated the Yakira earthquaxes. The length of these structures beaeath the thick overburden and the extent of their potential for generating carthquakes is not knern.
b.
In view of the unknowns mentioned above, the following questions were originated concerning the geology and seismology:
- 1) page 2.6-7, paragraph 2.6,2.1.2 states that the Yakiv.a Eidge Anticline extends from the east slorie of the Cascadcs to t.
point south of the l'pper Cold creek Valley. Provide evidence that a continuetion of this structure does not extene bene,th that part of the Pasco Fasin in which the site is locattd.
2. d. K./. 1
- 2) pare 2.6-7, paragraph circs several possible evidences of f
recent tcetonic activity.
ere any of these features (clast ic dikos, polygonal cracks), or other pheacnena that night have been causci by shakinn, encountered in soils ber. cath
g-the site? Are there indications of possible stratigraphie bffseta in coils beneath the site? Substantiate answers with appropriate field data.
- 3) page 2,6 27, third paragraph. Clarify the Statenint that the Fasco Cravelo have load bearing, capacity in excess of that of r.ornal alluvium because of menuer of deposition and depth of burial. Discuss the possibility that the sands ard gravels reached their present dense state as a result of severe shaking during earthquakes.
- 4) pcge 2.77-10, third part. graph. Discuss at.y relationship which there may be afncng the Yakina Anticline, the Yakina carthquake epicenter concentrat ions, and thr. Wooded iclatid nicroearth-quake cluster.
2.
The follo41ng qucstirns are ccncerned with investigations of subsurface soils beneath the site:
Foundatione Investigations Pepcrt by Shavnen and Uflst, Surina ry,
a.
payes 111 and iv, tentions that additional investigations for najor 3tructures will be ree,uired. Piedse descrite the additional investications plannad. D) these invehtigations include onsite trenching and if so what is the extent of the plan 5ed trenching?
b.
In the cane report, page 45, last paragraph, evaluations of other natural phononena such cs volcanic cetivity and faulting are recorrended, r.nd it is stated that it was underrtood by the criter of the repott that others were dcing these evaluations. Prcvide the datn Tren those invescigations as it applies to the site.
i c.
Page 1 of this report presents foundation details for Class I structures. The foundation details for the Class I cierrency cool-ing water storage facility were not included. Provide the foundation information for the Class I Emergency Cooling Pond.
d.
Tuo test pits vere dug to 8.0 and 8.5 foot depth, respectively, and Sirples were taken. Were scrples taken to det erriac the in situ relative densities of these nattrials? If not, it is reconnended that this be accomplished, and the results cenpared with the relative densities computed from the penetration blow counts through the sare caterial. This or sone other r,athod is censidercJ hichly derf rable te improve the level of confidence in the tect.ni(,ue cnployect durin,; t his invectigation of dcriving relative densities f ren the penetra tion test s, because ruel of ti o f ounda-tion desf en is based on the interpretation of relativo densities f ren the blou co.rnt s, u
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Foundations Investigation Report by Shannon and Wilson, page 23.
c.
In regard to a classification of materials below a depth of 250 feet, reference was made to the logs of deep borings made at nearby sites. As no boring was drilled into bedrock on the site, provide copies of representative boring logs from these other cites along with a map showing the locations of these borings relative to the llanford 2 site. Also, provide a dis-cussion with respect to the applicability of these borings to the Ifanford 2 site, f.
Appendix C of this report, Figures C-1 through C-5.
Provide a list of the recovery percentiles for each of the sampics used in the determination of the gradation curves presented on these figures, g.
Discuss the influence of the high gravel content within the fonniation soils on the penetration blow counts, and the recevary of ramples, h.
Page 2.6-34, second paragraph crates that interconnections betveen structures vill r.ot le conpleted until all settlement has ceased.
De. scribe the settlen.ent f onitoring program.
f.
An apparent inconsistency is present on page 2.6-36, second para-graph where it is indicated that the foundations of all critical structures will lie on Ringold rediments which are, according to page 18, paragral.h 3.2, at an average depth of 40 feet belou the present ground surface. I!owever, the deepest lying structure, which is the containment building, vill te founded at a depth of only 31 feet, please clarify t his inconsistency.
a f
f f