Design of instrumentation and control system for research reactors

New design is being carried out for the instrumentation and control (I&C) systems for a nuclear research reactor with intent to replace and improve the existing analog-based I&C systems. The I&C systems being designed are based on computer-based digital systems. Some systems that have not been designed in the exiting, old I&C systems are added into the I&C systems design in order to provide the diversity to improve the safety and availability of a reactor. The concept of the defense-in-depth implemented in the I&C system design is also described in this paper.