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Site response calculations for nuclear power plants

Description: Six typical sites consisting of three soil profiles with average shear wave velocities of 800, 1800, and 5000 ft/sec as well as two soil depths of 200 and 400 ft were considered. Seismic input to these sites was a synthetic accelerogram applied at the surface and corresponding to a statistically representative response spectrum. The response of each of these six sites to this input was calculated with the SHAKE program. The results of these calculations are presented. (auth)
Date: October 14, 1975
Creator: Wight, L.H.
Partner: UNT Libraries Government Documents Department

Fission product decay heat studies of December 15, 1975

Description: The purpose of the project described is to study fission product decay heating rates, with emphasis on short decay times. Isothermal calorimetry is used to perform benchmark experiments for decay times between 20 seconds and 2000 seconds with an absolute accuracy of better than 5 percent. Experiments are being done with $sup 235$U and will be done eventually with $sup 239$Pu. Thermal neutron spectra are used for the irradiations. The project was initiated in July 1974. Final results for $sup 235$U are expected by 6-30-76, and for $sup 239$Pu by 1-1-77. Final reports for each task will follow the final data by 3 months. The work done to date is described together with the status of the final experimental configuration.
Date: February 26, 1976
Creator: Yarnell, J.L. & Bendt, P.J.
Partner: UNT Libraries Government Documents Department

Comparison between dispersed nuclear power plants and a nuclear energy center at a hypothetical site on Kentucky Lake, Tennessee

Description: The thermal, ecological, and social impacts of a 40-reactor NEC are compared to impacts from four 10-reactor NECs and ten 4-reactor power plants. The comparison was made for surrogate sites in western Tennessee. The surrogate site for the 40-reactor NEC is located on Kentucky Lake. A layout is postulated for ten clusters of four reactors each with 2.5-mile spacing between clusters. The plants use natural-draft cooling towers. A transmission system is proposed for delivering the power (48,000 MW) to five load centers. Comparable transmission systems are proposed for the 10-reactor NECs and the 4-reactor dispersed sites delivering power to the same load centers. (auth)
Date: February 1, 1976
Creator: Fitzpatrick, F.C.; Gray, D.D.; Hyndman, J.R.; Sisman, O.; Suffern, J.S.; Tyrrell, P.A. et al.
Partner: UNT Libraries Government Documents Department

Error analyses on three methods for experimentally obtaining gap conductance values

Description: Gap conductance is a significant factor affecting the stored energy in a fuel rod at the beginning of a hypothetical accident sequence, as well as the thermal and mechanical response of the fuel rod during the accident. Additional well-characterized experimental results are needed to evaluate and improve the current analytical models used to calculate gap conductance during steady-state and transient reactor conditions. The basic difficulty in obtaining the needed data is the inherent uncertainty existing in any experimental method used to determine gap conductance information. The results of error analyses made on three experimental methods are presented and their relative uncertainties analyzed. (auth)
Date: January 1, 1975
Creator: Tolman, E.L. & Wells, M.E.
Partner: UNT Libraries Government Documents Department

New method for abbreviating the fault tree graphical representation

Description: Fault tree analysis is being widely used for reliability and safety analysis of systems encountered in the nuclear industry and elsewhere. A disadvantage of the fault tree method is the voluminous fault tree graphical representation that conventionally results from analysis of a complex system. Previous methods for shortening the fault tree graphical representation include (1) transfers within the fault tree, and (2) the use of the SAMPLE (K out of N logic) gate, the MATRIX gate, and the SUMMATION gate. The purpose of this presentation is to introduce TABULATION gates as a method to abbreviate the fault tree graphical representation. These new gates reduce the cost of analysis and generally increase the system behavior visibility that is inherent in the fault tree technique. (auth)
Date: December 1, 1974
Creator: Stewart, M.E.; Fussell, J.B. & Crump, R.J.
Partner: UNT Libraries Government Documents Department