[en] Advanced Heavy Water Reactor (AHWR) being designed for 920 MWth, is a vertical pressure tube type thorium-based reactor cooled by boiling light water and moderated by heavy water designed to maximize power production from thorium. This is a unique reactor designed for large scale commercial utilization of thorium and integrated technological demonstration. India's experience in design, operation and safety analyses/aspects of Pressurised Heavy water Reactors (PHWR) and Boiling Water Reactors (BWR) has been used to design this innovative reactor. The equilibrium fuel cycle is based on the conversion of naturally available thorium into fissile ²³³U driven by plutonium as external fissile feed. Plutonium is used as makeup fuel to achieve high discharge burnup and self-sustaining characteristics of Th-²³³U fuel cycle. The uranium in the spent fuel will be reprocessed and recycled back into the reactor. This paper gives the fuel cluster design and core design parameters for achieving self-sustenance in ²³³U in AHWR. (authors)