Detailed Inspection and Geologic Mapping of Construction Excavations at Palo Verde Nuclear Generating Station, Arizona
1984; Geological Society of America; Volume: xxi; Issue: 2 Linguagem: Inglês
10.2113/gseegeosci.xxi.2.179
ISSN1558-9161
Autores Tópico(s)earthquake and tectonic studies
ResumoResearch Article| May 01, 1984 Detailed Inspection and Geologic Mapping of Construction Excavations at Palo Verde Nuclear Generating Station, Arizona WILLIAM R. LUND; WILLIAM R. LUND Ertec Western Inc., P.O. Box 14570, Phoenix, AZ 85063 * Present address: Utah Geological and Mineral Survey, 606 Black Hawk Way, Salt Lake City, UT 84108 Search for other works by this author on: GSW Google Scholar KENNETH M. EUGE KENNETH M. EUGE Ertec Western Inc., P.O. Box 14570, Phoenix, AZ 85063 Search for other works by this author on: GSW Google Scholar Environmental and Engineering Geoscience (1984) xxi (2): 179–189. https://doi.org/10.2113/gseegeosci.xxi.2.179 Article history first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation WILLIAM R. LUND, KENNETH M. EUGE; Detailed Inspection and Geologic Mapping of Construction Excavations at Palo Verde Nuclear Generating Station, Arizona. Environmental and Engineering Geoscience 1984;; xxi (2): 179–189. doi: https://doi.org/10.2113/gseegeosci.xxi.2.179 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyEnvironmental and Engineering Geoscience Search Advanced Search Abstract Geologic inspection and mapping of construction excavations are being conducted at Palo Verde Nuclear Generating Station (PVNGS), Arizona to satisfy Nuclear Regulatory Commission (NRC) seismic safety requirements. Facilities at PVNGS are grouped by seismic-design criteria into Category I and Non-Category I structures. Category I facilities are critical to plant operation and must function normally for the reactors to be shut down safely. Excavations for Category I structures are mapped in detail; Non-Category I excavations are inspected and photographed.Initial siting investigations determined that the geology of PVNGS consists of a Precambrian metamorphic and granitic complex overlain by Miocene volcanics, which are in turn overlain by Miocene to Holocene basin sediments. Basin sediments were divided into 17 subunits based on detailed foundation studies and the 5 uppermost were expected to be exposed in Category I powerblock excavations.Construction schedules require a rapid, accurate mapping technique that can be employed before as-graded topographic maps of the excavations are available. A computer assisted theodolite and infrared distance measuring equipment are used to establish topographic control concurrently with geologic mapping. Survey points are located on critical geologic features allowing mapping to an accuracy of 0.1 ft (3 cm) horizontally and vertically. Non-Category I inspections were recorded on a dictaphone and transcribed later for the record.Detailed mapping of excavations has confirmed the geologic model developed during earlier geologic and engineering investigations. A continuous, unbroken contact between coarse-grained units above and clay strata below could be traced around the powerblock excavations. No evidence of faulting or other geologic process which might compromise site integrity has been found in excavations for either Category I or Non-Category I structures. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.
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