The Thermo Scientific™ Coincidentor Logic Chassis is a self-contained monitor that processes bistable signals from nuclear systems. It is an integral part of the plant's Reactor Protection System and allows testing of the system on-line without jeopardizing safety and operations.
The coincidentors process the bistable signals from the Wide Range and Power Range Neutron Flux Monitors. They also contain circuits for inserting manual trip signals, bypassing single channels, monitoring non-operate conditions, and test control.
- Process the bistable signals from the Wide Range and Power Range Neutron Flux Monitors
- Provide indication of bistable status from all four Wide Range and Power Range Monitors
- Majority voting logic circuits are used such that two out of the four monitors must indicate the condition before the output is passed to the plant systems
- To meet single failure criteria, all logic circuits are duplicated and the outputs must match before alarms and trip signals are passed to plant systems
- Contains circuits for inserting manual trip signals, bypassing single channels, monitoring non-operating conditions and test control
- Chassis is an integral part of the plant's Reactor Protection System