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Book Chapter

Borehole geophysics in nuclear power plant siting

By
James W. Crosby, III
James W. Crosby, III
Geological Engineering Section, Washington State University, Pullman, Washington 99164
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John D. Scott
John D. Scott
FUGRO, Inc., 3777 Long Beach Boulevard, Long Beach, California 90807
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Published:
January 01, 1979

Abstract

Miniaturized borehole geophysical equipment designed for use in ground-water investigations can be adapted to investigations of nuclear power plant sites. This equipment has proved to be of value in preliminary and comprehensive studies of interior basins where thick sequences of Quaternary clastic sediment, occasionally with associated volcanic rocks, pose problems of stratigraphic correlation. The unconsolidated nature of the deposits generally requires that exploratory holes be cased, which ordinarily restricts the borehole geophysical studies to the radiation functions—natural gamma, gamma-gamma, neutron-gamma, and neutron-epithermal neutron logs. Although a single log response may be dominant in a given area, correlations derive from consideration of all log responses as a composite group. Because major correlations usually are based upon subtle differences in the physical properties of the penetrated sediment, high-resolution logging procedures are employed with some sacrifice of the quantitative parameters important to petroleum technology. All geophysical field data are recorded as hard copy and as digital information on punched paper tape. Digital data are subsequently computer processed and plotted to scales that enhance the stratigraphic data being correlated. Retention of the data in analog format permits rapid review, whereas computer plotting allows playback and detailed examination of log sections and sequences that may be attenuated on hard copy because of the logarithmic nature of the response to the physical property being examined.

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Contents

GSA Reviews in Engineering Geology

Geology in the Siting of Nuclear Power Plants

Allen W. Hatheway
Allen W. Hatheway
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Cole R. Mcclure
Cole R. Mcclure
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Geological Society of America
Volume
IV
ISBN electronic:
9780813758046
Publication date:
January 01, 1979

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