Digital protection system for nuclear power plant

A digital protection system comprising:

• a process protection system comprising at least two channels, each of the at least two channels comprising a first bistable logic controller and a second bistable logic controller which is independent and different from the first bistable logic controller, the first bistable logic controller and the second bistable logic controller receiving a process parameter and outputting bistable logic results based on the process parameter;
• and
• a reactor protection system comprising at least two trains, at least two initiation circuits, and a parallel circuit, wherein
• each of the two trains comprises a first coincidence logic controller and a second coincidence logic controller which is independent and different from the first coincidence logic controller, the first coincidence logic controller and the second coincidence logic controller outputting coincidence logic results based on the bistable logic results,
• each of the at least two initiation circuits comprises a serial circuit in which a plurality of relays are serially connected,
• the parallel circuit comprises a plurality of relays which are connected in parallel,
• the plurality of relays included in the serial circuit is switched on or off based on the bistable logic results received from the first and the second bistable logic controllers that are different from each other, and
• the plurality of relays included in the parallel circuit is switched on or off based on the coincidence logic results received from the first and the second coincidence logic controllers that are different from each other.