Simulation study on thermal characteristics of primary coolant system of lead-bismuth cooled reactor

According to the structural characteristics of the lead-bismuth (LBE) cooled reactor and the flow and heat transfer characteristics of the coolant, a real-time simulation model of the primary coolant system (PCS) is developed. The Reference Fluid Properties (REFPROP) is called to calculate the properties of supercritical carbon dioxide (S–CO2), and the International Mathematics Statistics Library (IMSL) is used to call D_IVPAG function to solve the system of stiff differential equations in fully implicit scheme. Using the idea of matrix modularity, the transient code is developed in FORTRAN language. The transient characteristics of power step, primary and secondary flow rate and temperature step are studied respectively. The results show that the transient code can well reflect the dynamic characteristics of the LBE cooled reactor, and the code and algorithm meet the real-time requirements.