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The use of graphical dynamic system simulation software is becoming more popular as economic demands require reducing time and cost of development and troubleshooting equipment. Nuclear power plants pose unique problems in this regard because installed equipment must be available to support the plant safety function, so it is not available to support qualification testing of new designs or troubleshooting in the case of equipment malfunction. Commercial design processes have similar constraints due to the high cost of prototype development. This paper discusses recent successes in using modular system simulation software to support the implementation of improved speed control governors installed on emergency diesel generators. The original governors are to be replaced as part of an overall control system upgrade.