A PVM executive program has been developed for use with the RELAP5-3D© computer program. The PVM executive allows RELAP5-3D© to be coupled with any number of other computer programs to perform integrated analyses of nuclear power reactor systems and related experimental facilities. The executive program manages all phases of a coupled computation. It starts up and configures a virtual machine, spawns all of the coupled processes, coordinates the time step size between the coupled codes, manages the production of printed and plotable output, and shuts the virtual machine down at the end of the computation. The executive program also monitors that status of the coupled computation, repeating time steps as needed and terminating a coupled computation gracefully if one of the coupled processes is terminated by the computational node on which it is executing.

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