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There are a wide variety of fast spectrum molten salt reactor (FSMSR) designs and corresponding fuel cycles that shown promise. These designs differ in features. Therefore, it becomes difficult to determine whether a set of parameters is applicable to all, one, or none of these designs. This paper presents a number of iterations of a FSMSR concept with a sodium chloride carrier salt. Different design characteristics and their effects on the neurotics parameters are shown. The results show that effective delayed neutron fraction, mean neutron generation time, neutron yield, and energy of neutrons causing a fission all follow trends based off the heavy metal concentration and leakage rate. This paper also gives preliminary fuel cycle calculations and the evolution of the neutronic parameters over burnup. A FSMSR initially fueled with low enriched uranium will naturally breed at a certain core volume, without a need for refueling, for decades of full power operation. [ABSTRACT FROM AUTHOR]

• Diversion of plutonium results in changes in kinetic parameters. • Dynamic models reveal signatures of plutonium removal in an Molten Salt Reactor. • Plutonium diversion ca be seen in Molten Salt Reactor frequency response. Safeguarding a Molten Salt Reactor (MSR) is an underexplored research topic. The high temperature, radiation, and corrosive nature of the fuel salt make installing and using instrumentation difficult. This study introduces a new innovative way of using the reactor's frequency response to determine if plutonium is diverted. As a low enriched uranium fueled MSR undergoes burnup, plutonium builds up in the fuel salt and increasingly contributes to fissions. As a result, the kinetic parameters, mean neutron generation time and delayed neutron fraction, evolve with depletion. These changes are large enough to be discerned as unique patterns in the MSR system frequency response. Likewise, a specific pattern is seen if there is a removal of plutonium. Given the simplicity of establishing a frequency response of an operating MSR, this method presents a breakthrough in MSR safeguards. [ABSTRACT FROM AUTHOR]