"I developed computer-based simulations that allow operators to change controller settings, analyze the effects of the changes, then explore them mathematically," said Hal Warren, senior instructor-Nuclear Training, Surry Power Station. "This helps them develop a better understanding of the effects generated by each change."

Warren developed a second simulation that depicts how station equipment responds to certain types of emergency events. "It also explores operation of the atmospheric dump valves in automatic and manual modes, as well as common system failures that can occur and the actions that need to be taken by operators," he said.

"The simulations can be used at an employee's workstation or can be projected in a classroom environment to provide a rapid method for understanding complex process controller concepts." Warren's simulations were designed on a Pentium PC using VisSim modeling and simulation software. He said the feedback received from trainees indicated an improvement in the assimilation and retention of the training material, and instruction time was reduced from 10 hours to two hours.

"The simulations also provided us with a new method of troubleshooting systems and equipment without impacting station operation," he added.

For his efforts, Warren recently was awarded a Training Excellence Award from the American Nuclear Society for achievement, excellence and innovation in nuclear training. The simulations also were recognized by the Institute of Nuclear Power Operations (INPO) during a 1995 plant evaluation.

The Training Center at the Surry VA power station is tasked with providing continuing education of its operating personnel in a formal classroom environment. VisSim is a visual block-diagram based modeling and simulation applications environment that runs on Windows and UNIX/X platforms. Along with VisSim/Real-Time add-on software, it is an ideal tool for modeling controls and plant functions for the purpose of commissioning new processes and for training operators.