Digital protection system for nuclear power plant

A digital protection system having at least two channels and at least two trains, the system comprising:

• a reactor trip switchgear system (RTSS) including at least one reactor trip breaker (RTB) for each train to control a supply of power to a control element drive mechanism (CEDM), each RTB disposed between the supply of power and the CDEM;
• a process protection system having, in one channel, first and second comparative logic controllers of different types that are mutually independent of each other, the first and second comparative logic controllers each receiving process variables as inputs and each outputting comparison logic results;
• a reactor protection system having, in one train, first and second concurrent logic controllers of different types that are mutually independent from each other, the first and second concurrent controllers each receiving the comparison logic results as inputs and each outputting concurrent logic results, the reactor protection system comprising a first initiation circuit including a first pair of coils and a second initiation circuit including a second pair of coils, each of the first and second initiation circuits further including a series circuit in which a plurality of relays are connected in series and a parallel circuit in which a plurality of relays are connected in parallel,
• wherein one of the series circuit relays is controlled by receiving one of the concurrent logic results as an input and one of the parallel circuit relays is controlled by receiving the other of the concurrent logic results as an input, and
• wherein, according to the concurrent logic results, the first initiation circuit transmits a control signal to the RTSS via the first pair of coils and the second initiation circuit transmits a control signal to the RTSS via the second pair of coils.