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Hot Dry Rock Geothermal Energy Development Program: Annual report, fiscal year 1985

Description: The primary objective for the Hot Dry Rock Program at the Los Alamos National Laboratory during fiscal year 1985 was to complete the Phase 2 reservoir connection and to begin flow testing the resulting reservoir. The connection was achieved through redrilling one well and additional fracturing operations, and progress was made toward developing a detailed understanding of the fractured region through a variety of reservoir interrogation methods. Other accomplishments during the fiscal year incl… more
Date: January 1, 1987
Creator: Brown, D. W.; Franke, P. R.; Smith, M. C. & Wilson, M. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Vibrational experiments at the HDR (Heissdampfreaktor): SHAG results and planning for SHAM

Description: As part of the second phase of vibrational/earthquake investigations at the HDR (Heissdampfreaktor) Test Facility in Kahl/Main, FRG, high-level shaker tests (SHAG) were performed during June and July 1986 using a coast-down shaker capable of generating 1000 tons of force. The purpose of these experiments was to investigate full-scale structural response, soil/structure interaction, and piping and equipment response under strong excitation conditions. While global safety considerations imposed l… more
Date: January 1, 1987
Creator: Kot, C.A.; Malcher, L. & Steinhilber, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Proceedings of the symposium on the Long Valley Caldera: A pre-drilling data review

Description: This proceedings volume contains papers or abstracts of papers presented at a two-day symposium held at the Lawrence Berkeley Laboratory (LBL) on 17 and 18 March 1987. Speakers presented a large body of new scientific results and geologic-hydrogeoloic interpretations for the Long Valley caldera. The talks and the discussions that followed focused on concepts and models for the present-day magmatic-hydrothermal system. Speakers at the symposium also addressed the topic of where to site future sc… more
Date: September 1, 1987
Creator: Goldstein, N.E. (ed.)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Testing, licensing, and code requirements for seismic isolation systems (for nuclear power plants)

Description: The use of seismic isolation as an earthquake hazard mitigation strategy for nuclear reactor power plants is rapidly receiving interest throughout the world. Seismic isolation has already been used on at least two French PWR plants, was to have been used for plants to be built in Iran, and is under serious consideration for advanced LMR plants (in the US, UK, France, and Japan). In addition, there is a growing use of seismic isolation throughout the world for other critical facilities such as h… more
Date: January 1, 1987
Creator: Seidensticker, R.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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An assessment of LMR reactor core vertical acceleration under seismic events

Description: This paper presents an assessment of reactor core vertical accelerations for large-diameter LMR reactors under various core-support conditions. A review of the various types of core-support concepts in use for LMR plants is given. The vertical seismic response is determined for a pool-type reactor with a core supported by the reactor vessel bottom head. The vertical core seismic response of a LMR with a core supported by the side wall of the reactor vessel is given. Conclusions and design recom… more
Date: January 1, 1987
Creator: Ma, D. C. & Seidensticker, R. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Identification of MHF (massive hydraulic fracturing) fracture planes and flow paths: A correlation of well log data with patterns in locations of induced seismicity

Description: One of the critical steps in developing a hot dry rock geothermal system is the creation of flow paths through the rock between two wellbores. To date, circulation systems have only been created by drilling one wellbore, hydraulically fracturing the well (which induces microearthquakes), locating the microearthquakes and then drilling a second wellbore through the zone of seismicity. A technique for analyzing the pattern of seismicity to determine where fracture planes are located in the seismi… more
Date: January 1, 1987
Creator: Dreesen, D.; Malzahn, M.; Fehler, M. & Dash, Z.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Component Fragility Research Program: Phase 1 component prioritization

Description: Current probabilistic risk assessment (PRA) methods for nuclear power plants utilize seismic ''fragilities'' - probabilities of failure conditioned on the severity of seismic input motion - that are based largely on limited test data and on engineering judgment. Under the NRC Component Fragility Research Program (CFRP), the Lawrence Livermore National Laboratory (LLNL) has developed and demonstrated procedures for using test data to derive probabilistic fragility description… more
Date: June 1, 1987
Creator: Holman, G.S. & Chou, C.K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Stress control of seismicity patterns observed during hydraulic fracturing experiments at the Fenton Hill hot dry rock geothermal energy site, New Mexico

Description: Seismicity accompanying hydraulic injections into granitic rock is often diffuse rather than falling along a single plane. This diffuse zone of seismicity cannot be attributed to systematic errors in locations of the events. It has often been asserted that seismicity occurs along preexisting joints in the rock that are favorably aligned with the stress field so that slip can occur along them when effective stress is reduced by increasing pore fluid pressure. A new scheme for determining orienta… more
Date: April 13, 1987
Creator: Fehler, M. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Sensitivity studies of a seismically isolated system to low frequency amplification

Description: Responses of a seismically isolated structure to earthquake motions will depend primarily on the input ground motion and the isolation system frequency. The isolation frequency generally is relatively low when isolating against horizontal ground motions. After installation, the isolation frequency could deviate from its designed value due to aging, manufacturing tolerance etc. In addition, under cettain soil conditions, the input motion could have high energy content at relatively low frequenci… more
Date: June 1, 1987
Creator: Wu, T.S. & Seidensticker, R.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Seismic fragility levels of nuclear power plant equipment

Description: Seismic fragility levels of safety-related electrical and mechanical equipment used in nuclear power plants are discussed. The fragility level is defined as the vibration level corresponding to initiation of equipment malfunctions. The test response spectrum is used as a measure of this vibration level. The fragility phenomenon of an equipment is represented by a number of response spectra corresponding to various failure modes. Analysis methods are described for determination of the fragility … more
Date: January 1, 1987
Creator: Bandyopadhyay, K.K. & Hofmayer, C.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Vibrational experiments at the HDR (Heissdampfreaktor) German/US cooperation

Description: As part of an overall effort on the validation of seismic calculational methods, the US NRC/RES is collaborating with the Kernforschungszentrum Karlsruhe, FRG, in the vibrational/earthquake experiments conducted at the HDR (Heissdampfreaktor) Test Facility in Kahl/Main, FRG. In the most recent experiments (SHAG), high level excitations were produced in the HDR by means of an eccentric-mass coastdown shaker capable of developing 1000 tons of force. The purpose of the experiments was to investiga… more
Date: April 1, 1987
Creator: Kot, C.A.; Malcher, L. & Costello, J.F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Seismic margin reviews of nuclear power plants: Identification of important functions and systems

Description: The purpose of this paper is to present the basis and method used for the development of the systems screening portion of the seismic margin review methodology. The results from the review of seven utility-sponsored seismic PRA's and one Seismic Safety Margins Research Program Study have been used to develop some insights regarding the importance of various systems and functions to seismic margins. (JDH)
Date: February 10, 1987
Creator: Prassinos, P. G.; Moore, D. L. & Amico, P. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Radioactive Waste Isolation in Salt: Peer review of documents dealing with geophysical investigations

Description: The Salt Repository Project, a US Department of Energy program to develop a mined repository in salt for high-level radioactive waste, is governed by a complex and sometimes inconsistent array of laws, administrative regulations, guidelines, and position papers. In conducting multidisciplinary peer reviews of contractor documents in support of this project, Argonne National Laboratory has needed to inform its expert reviewers of these governmental mandates, with particular emphasis on the relat… more
Date: March 1, 1987
Creator: McGinnis, L.D. & Bowen, R.H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Sloshing and fluid-structure interaction in a 400-MWe pool-type advanced fast reactor

Description: This paper describes the seismic analysis of a 400-MWe advanced fast reactor under 0.3 g SSE ground excitation. Two types of analyses are performed - the sloshing analysis and the fluid-structure interaction analysis. In the sloshing analysis, the sloshing frequency and wave patterns are calculated. The maximum wave height and the sloshing forces exerted on the submerged components and the primary tank are evaluated. In the fluid-structure interaction analysis, the maximum horizontal accelerati… more
Date: January 1, 1987
Creator: Ma, D.C.; Gvildys, J. & Chang, Y.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Radon in groundwater of the Long Valley Caldera, California

Description: In the Long Valley caldera, an area of recently (approx.550 y) active volcanism and current seismic activity, /sup 222/Rn concentrations in hot, warm, and cold spring waters have been measured since 1982. Rn contents of the waters correlate inversely with temperature and specific conductance, with high concentrations (1500 to 2500 pCi/l) occurring in dilute cold springs on the margins of the caldera, and low concentrations (12 to 25 pCi/l) in hot to boiling springs. Rn correlates only slightly … more
Date: April 1, 1987
Creator: Flexser, S.; Wollenberg, H. A. & Smith, A. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A new method for determining fluid flow paths during hydraulic fracturing

Description: Although hydraulic fracturing is a popular method for increasing the productivity of oil and gas wells, there is no direct way other than drilling additional boreholes to determine where the injected fluid has gone and thus what direction a fracture has propagated. Information about fluid flow paths is important for designing subsequent fracturing operations for nearby wells. Determining the locations and orientations of permeable fractures is also important in studies of potential toxic waste … more
Date: January 1, 1987
Creator: Fehler, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Soil-structure interaction effects on containment fragilities and floor response spectra statistics

Description: The probability-based method for the reliability evaluation of nuclear structures developed at Brookhaven National Laboratory (BNL) is extended to include soil-structure interaction effects. A reinforced concrete containment is analyzed in order to investigate the soil-structure interaction effects on: structural fragilities; floor response spectra statistics and acceleration response correlations. To include the effect of soil flexibility on the reliability assessment the following two step ap… more
Date: January 1, 1987
Creator: Pires, J.; Reich, M. & Chokshi, N. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Shield walls for the microwave tokamak experiment (MTX) facility

Description: The Alcator-C machine to be installed in the MTX facility will be housed in a one-foot-thick shield wall at Lawrence Livermore National Laboratory (LLNL). This facility differs from the housing at the Massachusetts Institute of Technology (MIT) in that the expected radiation levels are estimated to be higher because the free electron laser (FEL) will heat the plasma. The shield walls that surround the experiment will have a large amount of rebar and metal structure that will be isolated to vari… more
Date: October 9, 1987
Creator: Felker, B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A new method for determining dominant fluid flow paths during hydraulic fracturing

Description: Although hydraulic fracturing is a method that has been applied for many years to increase fracture permeability of reservoirs, there is no direct way other than drilling additional boreholes to determine where the injected fluid has gone and thus what direction fractures have propagated. Information about fluid flow paths is important for designing subsequent fracturing operations for nearby wells or for choosing a trajectory for a second well to drill through the fracture system, and thus cre… more
Date: January 1, 1987
Creator: Fehler, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Deep Structure Of Long Valley, California, Based On Deep Reflections From Earthquakes

Description: Knowledge of the deep structure of Long Valley comes primarily from seismic studies. Most of these efforts have focused on delimiting the top of the inferred magma chamber. We present evidence for the location of the bottom of the low velocity layer (LVL). Two other studies have provided similar information. Steeples and Iyer (1976) inferred from teleseismic P-wave delays that low-velocity material extends from 7 km depth to 25 to 40 km, depending on the velocities assumed. Luetgert and Mooney … more
Date: January 1, 1987
Creator: Zucca, J. J. & Kasameyer, P. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Earthquake location data for the southern Great Basin of Nevada and California: 1984 through 1986

Description: This report presents data in map and table form for earthquake parameters such as hypocentral coordinates and magnitudes for earthquakes located by the southern Great Basin Seismic network for the time period January 1, 1984, through December 31, 1986. These maps show concentrations of earthquakes in regions previously noted to be seismically active, including the Pahranagat Shear Zone, Pahroc Mountains, southern Nevada Test Site, Timber Mountain, Black Mountain, Gold Mountain, Montezuma Range,… more
Date: January 1, 1987
Creator: Harmsen, S. C. & Rogers, A. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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