Dynamic Characteristics Analysis and Steady-State Operation Scheme Design of Gas-Cooled Microreactor

The gas-cooled microreactor is a highly integrated system, in which the equipment is highly coupled and mutually constrained. The dynamic simulation model of a 5 MW gas-cooled microreactor is established through theoretical derivation, and the dynamic characteristics of the system are analyzed. On this basis, the steady-state operation scheme design method of the gas-cooled microreactor is proposed. Compared with the design value, the relative error of steady-state calculation results is less than 1%. The transient calculation results of the model are consistent with the experimental results. The maximum error of flow is less than 0.53 kg/s, and the maximum error of pressure is less than 0.027 MPa. The steady-state operation scheme is as follows: at the load level of 50%FP~100%FP (full power), the helium temperature at the reactor outlet and the rotor speed remain unchanged as the load decreases; at the load level of 0%FP~50%FP, the reactor outlet helium temperature and rotor speed linearly decrease with the decrease of the load; the helium temperature at the outlet of precooler and intercooler is constant at 0%FP~100%FP load level. The proposed steady-state operation scheme ensures the safe, stable and efficient operation of the gas-cooled microreactor under a wide range of variable operating conditions.