319 Matching Results

Search Results

Advanced search parameters have been applied.

Allcuts: a fast, comprehensive fault tree analysis code

Description: A description, user instructions, and a source program listing are presented for ALLCUTS, a Fortran computer code for fault tree analysis. The code was specifically designed to be easy to use as well as fast, versatile, and powerful. It may easily be modified by a moderately skilled programer to fit the variable needs of the user and the capabilities of his computer. A code, BRANCH, for determining input data gate and bottom event interrelationships is also presented. (7 references) (auth)
Date: July 1, 1975
Creator: Van Slyke, W.J. & Griffing, D.E.
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

Preliminary assessment of a hypothetical nuclear energy center in New Jersey: executive summary

Description: Site selection aspects are summarized for a nuclear energy center in New Jersey. This analysis, which was intended to be representative of coastal locations in general, included consideration of energy demand projections, power transmission, organizational issues, siting constraints, land use issues, environmental issues, taxation, and institutional and political issues. Recommendations are made for follow-on studies. (DG)
Date: November 1, 1975
Partner: UNT Libraries Government Documents Department

Final report on PCRV thermal cylinder axial tendon failures

Description: The post-test examination of the failed tendons from the PCRV thermal cylinder experiment has been concluded. Failures in the wires are attributed to stress-corrosion cracking. The cause of tendon failures has not been unequivocably established, but they may have been due to nitrates in the duct. The wires employed in the manufacture of the tendons will crack in less than 72 hr in a 0.2 M solution of ammonium nitrate at 70$sup 0$C. The quality of the wires is poor, and surface cracks were detected. These could have acted as concentrating sites for both stress and the deleterious contaminants. It is believed that the factors that led to the failures in the thermal cylinder experiment were unique. An improper formulation of the epoxy resin did not provide the tendon anchor plate seal that was desired; indeed, the improper formulation is responsible for the high level of nitrogen in the ducts of the failed tendons. (auth)
Date: January 1, 1976
Creator: Canonico, D.A.; Griess, J.C. & Robinson, G.C.
Partner: UNT Libraries Government Documents Department