ML20127K486

Forwards Rept on Seismicity of Monticello,Mn Area.Info Reviewed & Found Satisfactory

ML20127K486
Person / Time
Site:	Monticello
Issue date:	04/03/1967
From:	Tison J COMMERCE, DEPT. OF
To:	Price H US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20127K460	List: ML20127K458 ML20127K478 ML20127K486
References
NUDOCS 9211200416
Download: ML20127K486 (3)

Text

. _ . _ _ - _ _ _ . - . _ _ _ _ . - _ - - - _ - . . - . - _ _ _ - . . . - . _ . . .-

. . U.S. DEPARTMENT OF COMMERCE

. ENysnoNMENTAL SCICl4CC SCRVICCS ADMINISTRATION coast Ar.o cCoocTic sunvcv MXXM1MXM' J .KKGCX1TG2XXK nocav llc, uo. oen 4g 3 .7 su nen.v neren m C23 .

Mr. Harold L. Price ,

Director of Regulations U. S. Atomic Energy Commionion Washington, D. C. 20545

Dear Fx. Price:

In accordance with your request, we are forwarding 10 copies of our report on the seismicity of the Monti-cello, Minnesota, area. The Coast and Geodetic Survey has reviewed and evaluated the information on the seis-micity of the area presented by the applicant, Northern .-

States Power Company, and find that it is satisfactory ,.

with respect to both distant and nearby earthquakes.

If we.may be of further assiatance to you, please do not hesitate to contact us. /

Sincerely yours,

$Y C 11 df1 ..

. F. ear Admiral, US SAA

/ Director Enclosure i

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! REPORT ON THE SEISMICITY OF THE

' MONTICELLO, MINNES0'_'A AREA ,

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At the request of the Division of Reactor Licensing of ,

the Atomic Energy Commission, the Seinmology Division of the

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Coast and Geodetic Survey has evaluated the seismicity of

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l the area around the proposed reactor nite near Monticello, Minnesota, and has reviewed the similar analysis made by the- .

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applicant in their " Northern Statec Power Company, Monticello i

Nuclear Generating Plant, Facility Dencription and Safety

! Analysis Report" including Amendments through March 1967 The applicant's seismicity report is complete for both_ dis-

{ tant and nearby earthquakes wnich may have affected the pro-

, posed site. The entire area nas a low seismicity factor f with no known earthquakes witnin 25-50 miles-of the site.

i

The applicant refers to the nearest known fault, the -

j Douglas Fault about 23 miles from the reactor site, which a

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4 has not been related to_any earthquakes-in historic times.

4 There seems to be-little or no relation between the few known faults- in the, area and the historic earthquakes. More-over the= intensities of these earthquakes _in this'section of 4

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4 ms- 4-, mwaym.,mnoe---,,v_..  %-enw,e p-wr.. m,-+o-, e m --- ., - ~

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! 2 the Canadian Shield do not exceed VI (MM). According to ,

Amendment 6 the Class I structures will be erected directly on sandstone or on a thin layer of sand (100% compact!1on) '

! overlying the sandstone. The seismic amplification factor j for this thin layer is considered negligible, l

i Based upon the review of the seismic history of the site and the surrounding-area and the related geologic con- <

siderations, the Coast and Geodetic Survey agrees with the ,

4 4 applicant that an acceleration of:0.12g.would represent the i

ground motion from the maximum earthquake likely to affect-this site. We believe this value would provide an adequato basis for designing protection against the loss of function of components important to safety. .

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3 4 U. S. Coast and Geodetic Survey i Rockville, Maryland l March 30,1967 p .

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