Digital control and instrumentation systems
The Control and Instrumentation (C&I) systems use state of the art digital and
fiber optic technologies. The ABWR has four separate divisions of safety system
logic and control, including four separate, redundant multiplexing networks to
provide absolute assurance of plant safety. Each system includes microprocessors
to process incoming sensor information and to generate outgoing control signals,
local and remote multiplexing units for data transmission, and a network of
fiber optic cables. The controllers are fault tolerant meaning that they
continually generate signals to simulate input data and compare the result against the
expeced outcome. Controllers for both sensors and equipment are located on cards
which are remotely distributed. In the event that a problem is detected by the
controller, a signal is sent to the control room. Within minutes, the
malfunctioning card can be replaced with a spare.
Special Features of ABWR