A Two-Dimensional Free Lagrangian Hydrodynamics Model

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Comparison of Carbide and Oxide Fuel-Coolant Interactions Resulting From Overpower Transients. [LMFBR]

The consequences of carbide-fuel-coolant interactions (CFCI) resulting from overpower transients have been investigated with the PLUTO code (PLUTO1 version). The predictions are based on direct extrapolation from oxide-developed phenomenology. In addition the carbide results are compared to an ''equivalent'' oxide-fuel-coolant interaction (OFCI). The initial conditions for the fuel-coolant-interactions are based on predictions from whole core accident studies. The detailed calculations indicate that under these assumptions, using the oxide results as a standard of measure, the CFCI can be characterized by the following: (1) higher sodium temperatures and thus higher sodium vapor pressure in the interaction zone, (2) more rapid insertion of sodium voiding reactivity, (3) higher degree of z-symmetry (with respect to the rupture location) in the ejected fuel distribution, (4) more rapid growth of the interaction zone, and (5) an indication of the temporary shutting off of fuel ejection during the early stage of the interaction

Development of an Integrated Top Spray and Bottom Reflooding Computer Model for Light Water Reactor Safety Analysis

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Advances, Applications and Performance of the Global Arrays Shared Memory Programming Toolkit

This paper describes capabilities, evolution, performance, and applications of the Global Arrays (GA) toolkit. GA was created to provide application programmers with an interface that allows them to distribute data while maintaining the type of global index space and programming syntax similar to that available when programming on a single processor. The goal of GA is to free the programmer from the low level management of communication and allow them to deal with their problems at the level at which they were originally formulated. At the same time, compatibility of GA with MPI enables the programmer to take advantage of the existing MPI software/libraries when available and appropriate. The variety of applications that have been implemented using Global Arrays attests to th