Abstract
Advanced Power Reactor 1400 (APRI400) Man-Machine Interface Systems (MMIS) designs, which encompass the design of the Main Control Room (MCR) and Instrumentation and Control (I&C) systems, make use of advanced digital technologies which have been proven through industrial operating experience and extensive testing and development program. I&C system has been designed with the network-based distributed control architecture. Diversity between safety I&C systems and non-safety I&C systems along with hardwired switches are provided for the defense in depth against common mode failure of software in the safety I&C systems. There are some design improvement such as adoption of multi-loop controllers, multiplexing devices for both safety and non safety control, universal soft controller in main control room for both safety and nonsafety I &# C equipment controls.
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