A new reactor burnup strategy CANDLE (ConstantAxial shape of Neutron flux, nuclide densities and powershape During Life of Energy producing reactor) wasproposed [1], where distributions of neutron flux, nuclidedensities and power density move with a constant velocityand without any change in their shapes during whole lifeof reactor operation.CANDLE shows outstanding simplicity and safetyfeatures. For a fast reactor with excellent neutroneconomy, it offers also an extremely excellentperformance that about 40 % of the charged fuel is burnt,where only natural or depleted uranium is required as areplacing fuel. [1]This reactor does not require burnup reactivitycontrol as long as operated in steady state condition.However, after reactor shut-down the reactivity isconsidered to decrease because of the decay of 241Pu. Inthe present study, the change of reactivity after shut-downand restart is investigated for large CANDLE fast reactorswith natural uranium as replacing fuel.
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