Abstract
The 4S (Super-safe small, and simple reactor) core, based on the Toshiba Gen-IV 10MWe fast reactor design, is modeled and simulated with the Monte Carlo code MCNP to obtain useful neutronics design information. This paper carries out a preliminary pin-cell simulation to obtain the neutron spectrum, the infinite multiplication k∞ and the effect of temperature and moderator density followed by a full-core simulation for the effective multiplication factor keff with a central absorber control rod. Two absorber materials are considered viz boron carbide (B4C) and hafnium (Hf) to determine the fuel inventory to balance the beginning of cycle (BOC) excess reactivity. It is found that for a single central absorber rod of radius 9cm, the maximum fuel rod radius is 6mm for hafnium and 6.2mm for B4C. This work is of use for the core design of small multipurpose Gen-IV reactors.
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