ML20056B628
| ML20056B628 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 02/06/1967 |
| From: | Dienhart A NORTHERN STATES POWER CO. |
| To: | Boyd R US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 9102070630 | |
| Download: ML20056B628 (3) | |
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NSP NORTHERN STATES POWER COMPANY M IN N E A PO LI S. MI N N E S OTA S 5 401 mbruary 6, 1967 4
VIA AIR MAIL
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- Mr Ibger S Boyd, 01ief Ibsearch & Pcuer Ibactor Safety Branch Division of Reactor Licensing thited States Atcznic Energy Ommission N
Washington, D C 20545 Dear Mr Bo3d RNTIrmn NLKLEAR G:2ERATING PI1Rr E5979 AEC Ibcket 50-263 Ibview of Ceology, Hydrology, and Seisr: ology (bnfirming our conversation with Mr Brian Grimes of your staff cn Ebbruary 4, we are sending herewith scne information which should assist your consultants in interpreting the geological and hydrological information appearing in the Facility Ibscription and Safety Analysis Ibport.
%e information attached to this letter is as follcus:
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Wree copies of logs of all soil borings taken at the site. mese are contained in the follcMin NSP drawings:
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NH-32954 Mi-33624 Mi-33711 NH-33623 IM-33708 1M-34135
\\ j NH-32956 Mi-33709 Mi-34136 j
M1-32955 Mi-33710 NH-34137 2.
Bree copies of a report dated August 4,1966, by Da:es & lbore, Cbn-sultants in Applied Earth Sciences, sunmarizing the studies they made g
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as consultants to NSP in the areas of geclogy and hydrology.
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Wree copies of topographic maps. %cse are numbered NF'-33482-1-10.
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NOR HERN STATES POWER COMPANY
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Mr Ibger S Boyd, &def j
Ebbruary 6, 1967 j
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Bree copies of a nap of the river bottm contours. W is bears NSP number NR-33566.
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Wree copies cf an 8-1/2-in by ll-in sketch which shcus the locaticn j
of the pwerhouse wM reference to the bank of the river. mis sketch I
can be worked with i.e topographic nap, because it is referenced to the
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Minnesota coordinate system. You will notice that the riverward face of the powerhouse is about 200 ft landward of the river bank.
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tree copies of a flood frequency curve and three copies of a stage-j discharge curve. W e yard grade at the plant is presently established at elevation 93i, which is 14 ft zbove the predicted stage for the i
l 1,000 year flocS and 19 ft higher than the neximun flood of record.
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Wree copies ef an aerial photograph of the site. %ese could be J
useful in intorpreting the contours shown on the topographic map.
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As shown in f ne pWwgraph, the plant is located on a plateau which has elevatirns in the range of 930. Elevations innediately upriver,
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or to the yight on the photograph, are higher, generally around 940, and elevations downriver, or to the left on the photograph, are about 10 ft lower than at the plant site, being around elevation 920. W ese can be confirmed in detail by reference to the i.vr;g1.aphic maps.
IXmes & M3 ore acted as consultant to General Electric Ompany in the matter of j
detentaning allcuable soil boring pressures for detailed foundation design. We j
are obtaining copies of their reports frm General Electric and will send them to you within the next few days.
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We are also obtaining frcm General Electric copies of the foundation excavation i
drawings, which will permit your consultant to relate the foundations with the j
soil boring logs. %e excavation for the reactor building has been dug to ele-i vation 884 to rmove the clay layer occurring innediately above that elevation, j
and cmpacted granular backfill will be placed in the excavation to bring it to j
i the bottom of the reactor foundation slab. %e excavation in the turbine Itxzn j
l area has been carried to elevation 902, where adequate soil bearing values were j
reached.
i In the study of seis: ology, General Electric has engaged John A Blume and Associ-ates of San Francisco as consultants. General Electric will supply copies of 1
j B1me reports on seismology for your review.
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NOFs. HERN STATES POWER CG,dPANY Mr Ibger S Boyd, Olief Ebbruary 6, 1967 I
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At your convenience, representatives of 1EP, General Electric, Dures & bbore, and John A Blu:Te and Associates can meet with you and your consultants to dis-j cuss questions you may have in the areas of geology, hydrology, and seistology.
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4 Yours very truly i
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Arthur V Diediart Manager of Engineering l
AVD/nt Enclosures cc Messrs J B Violette S G Sr:olen Donald E Nelson E C Ward George D Ical l