Flattening of the Power Distribution in the HTGR Core with Structured Control Rods

Control rods (CRs) have a significant influence on reactor performance. Withdrawal of control rod leaves region the core significantly changed due to lack absorber, leading increased fission rate and later Xe135 buildup. In this paper, an innovative concept structured made tungsten is studied. It demonstrated that radial division can effectively compensate for reactivity loss during irradiation cycle high-temperature gas-cooled reactors (HTGRs) with prismatic while flattening power distribution. Implementation enables operator reduce effect in terms axial because absorber not completely removed from region, but its amount reduced. The results obtained characteristic evolution CRs design burnup calculation using refined timestep scheme show very stable reasonably low deviation density concentration average values. important all distributions improve burnup.