Supercritical Water-cooled Fast Reactor (SCWFR) presents features of combining fast and light water reactor characteristics in one design. The coolant mass flow rate is just as 1/8 as in the BWR, and the neutron energy is harder than in PWR, so it would has the breeding ability. In this paper, using different models of improved Flower-SCWFR core, the void reactivity effect, power distribution, and breeding ratio are analyzed by core zoning scheme, axial coolant densities zoning, seed and blanket assembly with suitable PID value, MOX fuel with different design and enrichment zoning, and solid u...
