Study on reactivity control method for supercritical water-cooled reactor CSR1000

The reactivity control of SCWR depends completely upon the burnable poisons and control rod clusters, so the burnable poisons placement and control rods strategy are very important for SCWR core design. In this paper, the burnable poison Er₂O₃ is chosen to homogeneously mix in the UO₂ pellets of all fuel rods, and the cross-plate control rods similar to that of BWRs are used. By the three-dimensional neutronics and thermal-hydraulic coupled calculations method, the control rods programming has been determined. In addition, the equilibrium core for CSR1000 has also been established by the three-dimensional equilibrium core search, and then an analysis of its key parameters shows that it can entirely satisfy the general design and safety requirements. (authors)