Analysis and Control of Reactivity Adjuster Rods of a Miniature Neutron Source Reactor.
Abstract: Neutronics plays a major role in nuclear reactor analysis, prediction, operation and safety of nuclear reactors. This research presents an investigative study into the determination of the neutronic parameters of four adjuster rods of the Miniature Neutron Source Reactor of Ghana using MCNP. New dimensions of adjuster rods measured were used to modify the existing MCNP input deck for accurate effective multiplication factor (keff) results. The point kinetic equations were generated from the neutron diffusion equation and solved analytically. The keff obtained from the MCNP code with other constant parameters of the facility were used to calculate the reactivity of the adjuster rods from the analytical solutions and compared with the numerical results from MCNP. Adjuster rod 1 had a worth of 0.15mk±0.006, rod 2: 0.15mk±0.006, rod 3: 0.13mk±0.006, rod 4: 0.09mk ±0.006, which were all comparable to experimental values of 0.1598mk, 0.01598mk, 0.0983mk, and 0.0983mk, respectively. Worth of reactivity determined could be used to update the Analysis Report of GHARR-1 and also ease the work of the maintenance engineers when adjusting reactivity of the core. A simulator was developed using Laboratory Virtual Instrumentation Engineering Workbench (LabVIEW) to mimic the motion of the adjuster rods if fitted within a motorized control mechanism.
Elizabeth Eniiwan Bhiise*
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