Ignalina NPP RBMK-1500 reactor control and protection system (RCPS) logic, which was implemented in code QUABOX/CUBBOX-HYCA, is described in the paper. Analysis of numerical simulation results shows, that logic of RBMK-1500 RPSS is adequate to logic as described in technical literature. Simulation results obtained by code QUABOX/CUBBOX-HYCA were compared with simulation results obtained using STEPAN code. The conclusion was made that RCPS operation sequences and response are analogical. The complement the code QUABOX/CUBBOX-HYCA with full realistic RCPS logic allows to simulate the transient processes and accidents, which have place in the reactor core of Ignalina nuclear power plant.
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