To obtain the optimal oxygen content control strategy for mitigating corrosion of fuel cladding in lead-bismuth fast reactors(LBFRs),this study constructed a T91 oxidation/corrosion model to analyze the evolution of the fuel element cladding interface.On this basis,taking the thickness of oxide layer as the constraint condition of the optimization problem,the whale optimization algorithm(WOA)was used to optimize the oxygen content control strategy,and the"low-medium-high-low"cyclic fluctuation oxygen content control strategy was obtained.Furthermore,this study simulated and compared the distribution of the oxide layer on the surface of fuel elements under fixed oxygen-dominated condition and optimized oxygen control strategy.The results indicated that under the optimized oxygen control strategy,the fuel element cladding did not trigger dissolution corrosion,and the overall thickness of the surface oxide layer was significantly reduced compared to the fixed oxygen-dominated condition,with an average thickness reduction of 95.6%for the magnetite layer and 44.2%for the spinel layer.The optimal oxygen content control strategy constructed in this paper can provide a reference for mitigating corrosion of cladding in lead-bismuth fast reactors.
Lead-bismuth eutecticOxidation corrosionCladding materialOxygen content control strategy
维普
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