Development of normal power control logies for the SMART

SMART power maneuvering control logics are developed. A Modular Modeling System (MMS) computer code is used for the evaluation of the developed control logics. In the SMART normal operating mode, the reactor can be maneuvered in the range of 20∼100% of the rated power by varying the feedwater flow rate and the SMART self-regulation features (MTC, Doppler effect). In this operating mode the Main Coolant Pumps (MCP's) are operating in a high speed. For matching the core exit temperature with a programmed temperature profile as a function of a reactor power, control rods are moved by utilizing the neutron flux (N-control) and core outlet temperature (T-control) signals. Two different control logics are developed as SMART power control logics, e.g., a T+N control logic using both neutron flux and core exit temperature signals and a T-control logic using only the core exit temperature signal. Those control logics are compared and evaluated by simulating fast power variation transients