Reseach reactor is a multi function nuclear reactor that provide neutron sources and gamma radiation for use in some activities. This wide range of activities necessitates frequent adjustments of a sereach reactor power. To increase the flexibility of operation withhigh degree of safety, th eresearch reactor control system should be automated . This paper describes th emodel- based control sysytems for used in research reactor that was designed by period-generated control methhod. Thhis control system is designed by combining feedback and feedforward control technics that can be control non-linear system. The rate of Change of reactivity is used as actuartor signal. Performance test has been conducted in MITR-II owned by Massachusetts Institute of Technology and ACRR that is operated by Sandia National Laboratories. The result shows that the model-based digital control system is superior to control the research reactor operation.
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